1 /***************************************************************************
5 copyright : (C) 2003-2017 by Intra2net AG and the libftdi developers
6 email : opensource@intra2net.com
7 ***************************************************************************/
9 /***************************************************************************
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU Lesser General Public License *
13 * version 2.1 as published by the Free Software Foundation; *
15 ***************************************************************************/
18 \mainpage libftdi API documentation
20 Library to talk to FTDI chips. You find the latest versions of libftdi at
21 https://www.intra2net.com/en/developer/libftdi/
23 The library is easy to use. Have a look at this short example:
26 More examples can be found in the "examples" directory.
28 /** \addtogroup libftdi */
38 /* Prevent deprecated messages when building library */
39 #define _FTDI_DISABLE_DEPRECATED
41 #include "ftdi_version_i.h"
43 #define ftdi_error_return(code, str) do { \
45 ftdi->error_str = str; \
47 fprintf(stderr, str); \
51 #define ftdi_error_return_free_device_list(code, str, devs) do { \
52 libusb_free_device_list(devs,1); \
53 ftdi->error_str = str; \
59 Internal function to close usb device pointer.
60 Sets ftdi->usb_dev to NULL.
63 \param ftdi pointer to ftdi_context
67 static void ftdi_usb_close_internal (struct ftdi_context *ftdi)
69 if (ftdi && ftdi->usb_dev)
71 libusb_close (ftdi->usb_dev);
74 ftdi->eeprom->initialized_for_connected_device = 0;
79 Initializes a ftdi_context.
81 \param ftdi pointer to ftdi_context
84 \retval -1: couldn't allocate read buffer
85 \retval -2: couldn't allocate struct buffer
86 \retval -3: libusb_init() failed
88 \remark This should be called before all functions
90 int ftdi_init(struct ftdi_context *ftdi)
92 struct ftdi_eeprom* eeprom;
95 ftdi->usb_read_timeout = 5000;
96 ftdi->usb_write_timeout = 5000;
98 ftdi->type = TYPE_BM; /* chip type */
100 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
102 ftdi->readbuffer = NULL;
103 ftdi->readbuffer_offset = 0;
104 ftdi->readbuffer_remaining = 0;
105 ftdi->writebuffer_chunksize = 4096;
106 ftdi->max_packet_size = 0;
107 ftdi->error_str = NULL;
108 ftdi->module_detach_mode = AUTO_DETACH_SIO_MODULE;
110 if (libusb_init(&ftdi->usb_ctx) < 0)
111 ftdi_error_return(-3, "libusb_init() failed");
113 ftdi_set_interface(ftdi, INTERFACE_ANY);
114 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
116 eeprom = (struct ftdi_eeprom *)malloc(sizeof(struct ftdi_eeprom));
118 ftdi_error_return(-2, "Can't malloc struct ftdi_eeprom");
119 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
120 ftdi->eeprom = eeprom;
122 /* All fine. Now allocate the readbuffer */
123 return ftdi_read_data_set_chunksize(ftdi, 4096);
127 Allocate and initialize a new ftdi_context
129 \return a pointer to a new ftdi_context, or NULL on failure
131 struct ftdi_context *ftdi_new(void)
133 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
140 if (ftdi_init(ftdi) != 0)
150 Open selected channels on a chip, otherwise use first channel.
152 \param ftdi pointer to ftdi_context
153 \param interface Interface to use for FT2232C/2232H/4232H chips.
156 \retval -1: unknown interface
157 \retval -2: USB device unavailable
158 \retval -3: Device already open, interface can't be set in that state
160 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
163 ftdi_error_return(-2, "USB device unavailable");
165 if (ftdi->usb_dev != NULL)
167 int check_interface = interface;
168 if (check_interface == INTERFACE_ANY)
169 check_interface = INTERFACE_A;
171 if (ftdi->index != check_interface)
172 ftdi_error_return(-3, "Interface can not be changed on an already open device");
180 ftdi->index = INTERFACE_A;
186 ftdi->index = INTERFACE_B;
192 ftdi->index = INTERFACE_C;
198 ftdi->index = INTERFACE_D;
203 ftdi_error_return(-1, "Unknown interface");
209 Deinitializes a ftdi_context.
211 \param ftdi pointer to ftdi_context
213 void ftdi_deinit(struct ftdi_context *ftdi)
218 ftdi_usb_close_internal (ftdi);
220 if (ftdi->readbuffer != NULL)
222 free(ftdi->readbuffer);
223 ftdi->readbuffer = NULL;
226 if (ftdi->eeprom != NULL)
228 if (ftdi->eeprom->manufacturer != 0)
230 free(ftdi->eeprom->manufacturer);
231 ftdi->eeprom->manufacturer = 0;
233 if (ftdi->eeprom->product != 0)
235 free(ftdi->eeprom->product);
236 ftdi->eeprom->product = 0;
238 if (ftdi->eeprom->serial != 0)
240 free(ftdi->eeprom->serial);
241 ftdi->eeprom->serial = 0;
249 libusb_exit(ftdi->usb_ctx);
250 ftdi->usb_ctx = NULL;
255 Deinitialize and free an ftdi_context.
257 \param ftdi pointer to ftdi_context
259 void ftdi_free(struct ftdi_context *ftdi)
266 Use an already open libusb device.
268 \param ftdi pointer to ftdi_context
269 \param usb libusb libusb_device_handle to use
271 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
280 * @brief Get libftdi library version
282 * @return ftdi_version_info Library version information
284 struct ftdi_version_info ftdi_get_library_version(void)
286 struct ftdi_version_info ver;
288 ver.major = FTDI_MAJOR_VERSION;
289 ver.minor = FTDI_MINOR_VERSION;
290 ver.micro = FTDI_MICRO_VERSION;
291 ver.version_str = FTDI_VERSION_STRING;
292 ver.snapshot_str = FTDI_SNAPSHOT_VERSION;
298 Finds all ftdi devices with given VID:PID on the usb bus. Creates a new
299 ftdi_device_list which needs to be deallocated by ftdi_list_free() after
300 use. With VID:PID 0:0, search for the default devices
301 (0x403:0x6001, 0x403:0x6010, 0x403:0x6011, 0x403:0x6014, 0x403:0x6015)
303 \param ftdi pointer to ftdi_context
304 \param devlist Pointer where to store list of found devices
305 \param vendor Vendor ID to search for
306 \param product Product ID to search for
308 \retval >0: number of devices found
309 \retval -3: out of memory
310 \retval -5: libusb_get_device_list() failed
311 \retval -6: libusb_get_device_descriptor() failed
313 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
315 struct ftdi_device_list **curdev;
317 libusb_device **devs;
321 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
322 ftdi_error_return(-5, "libusb_get_device_list() failed");
327 while ((dev = devs[i++]) != NULL)
329 struct libusb_device_descriptor desc;
331 if (libusb_get_device_descriptor(dev, &desc) < 0)
332 ftdi_error_return_free_device_list(-6, "libusb_get_device_descriptor() failed", devs);
334 if (((vendor || product) &&
335 desc.idVendor == vendor && desc.idProduct == product) ||
336 (!(vendor || product) &&
337 (desc.idVendor == 0x403) && (desc.idProduct == 0x6001 || desc.idProduct == 0x6010
338 || desc.idProduct == 0x6011 || desc.idProduct == 0x6014
339 || desc.idProduct == 0x6015)))
341 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
343 ftdi_error_return_free_device_list(-3, "out of memory", devs);
345 (*curdev)->next = NULL;
346 (*curdev)->dev = dev;
347 libusb_ref_device(dev);
348 curdev = &(*curdev)->next;
352 libusb_free_device_list(devs,1);
357 Frees a usb device list.
359 \param devlist USB device list created by ftdi_usb_find_all()
361 void ftdi_list_free(struct ftdi_device_list **devlist)
363 struct ftdi_device_list *curdev, *next;
365 for (curdev = *devlist; curdev != NULL;)
368 libusb_unref_device(curdev->dev);
377 Frees a usb device list.
379 \param devlist USB device list created by ftdi_usb_find_all()
381 void ftdi_list_free2(struct ftdi_device_list *devlist)
383 ftdi_list_free(&devlist);
387 Return device ID strings from the usb device.
389 The parameters manufacturer, description and serial may be NULL
390 or pointer to buffers to store the fetched strings.
392 \note Use this function only in combination with ftdi_usb_find_all()
393 as it closes the internal "usb_dev" after use.
395 \param ftdi pointer to ftdi_context
396 \param dev libusb usb_dev to use
397 \param manufacturer Store manufacturer string here if not NULL
398 \param mnf_len Buffer size of manufacturer string
399 \param description Store product description string here if not NULL
400 \param desc_len Buffer size of product description string
401 \param serial Store serial string here if not NULL
402 \param serial_len Buffer size of serial string
405 \retval -1: wrong arguments
406 \retval -4: unable to open device
407 \retval -7: get product manufacturer failed
408 \retval -8: get product description failed
409 \retval -9: get serial number failed
410 \retval -11: libusb_get_device_descriptor() failed
412 int ftdi_usb_get_strings(struct ftdi_context *ftdi,
413 struct libusb_device *dev,
414 char *manufacturer, int mnf_len,
415 char *description, int desc_len,
416 char *serial, int serial_len)
420 if ((ftdi==NULL) || (dev==NULL))
423 if (ftdi->usb_dev == NULL && libusb_open(dev, &ftdi->usb_dev) < 0)
424 ftdi_error_return(-4, "libusb_open() failed");
426 // ftdi->usb_dev will not be NULL when entering ftdi_usb_get_strings2(), so
427 // it won't be closed either. This allows us to close it whether we actually
428 // called libusb_open() up above or not. This matches the expected behavior
429 // (and note) for ftdi_usb_get_strings().
430 ret = ftdi_usb_get_strings2(ftdi, dev,
431 manufacturer, mnf_len,
432 description, desc_len,
435 // only close it if it was successful, as all other return codes close
436 // before returning already.
438 ftdi_usb_close_internal(ftdi);
444 Return device ID strings from the usb device.
446 The parameters manufacturer, description and serial may be NULL
447 or pointer to buffers to store the fetched strings.
449 \note The old function ftdi_usb_get_strings() always closes the device.
450 This version only closes the device if it was opened by it.
452 \param ftdi pointer to ftdi_context
453 \param dev libusb usb_dev to use
454 \param manufacturer Store manufacturer string here if not NULL
455 \param mnf_len Buffer size of manufacturer string
456 \param description Store product description string here if not NULL
457 \param desc_len Buffer size of product description string
458 \param serial Store serial string here if not NULL
459 \param serial_len Buffer size of serial string
462 \retval -1: wrong arguments
463 \retval -4: unable to open device
464 \retval -7: get product manufacturer failed
465 \retval -8: get product description failed
466 \retval -9: get serial number failed
467 \retval -11: libusb_get_device_descriptor() failed
469 int ftdi_usb_get_strings2(struct ftdi_context *ftdi, struct libusb_device *dev,
470 char *manufacturer, int mnf_len,
471 char *description, int desc_len,
472 char *serial, int serial_len)
474 struct libusb_device_descriptor desc;
477 if ((ftdi==NULL) || (dev==NULL))
480 need_open = (ftdi->usb_dev == NULL);
481 if (need_open && libusb_open(dev, &ftdi->usb_dev) < 0)
482 ftdi_error_return(-4, "libusb_open() failed");
484 if (libusb_get_device_descriptor(dev, &desc) < 0)
485 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
487 if (manufacturer != NULL)
489 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
491 ftdi_usb_close_internal (ftdi);
492 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
496 if (description != NULL)
498 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
500 ftdi_usb_close_internal (ftdi);
501 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
507 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
509 ftdi_usb_close_internal (ftdi);
510 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
515 ftdi_usb_close_internal (ftdi);
521 * Internal function to determine the maximum packet size.
522 * \param ftdi pointer to ftdi_context
523 * \param dev libusb usb_dev to use
524 * \retval Maximum packet size for this device
526 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
528 struct libusb_device_descriptor desc;
529 struct libusb_config_descriptor *config0;
530 unsigned int packet_size;
533 if (ftdi == NULL || dev == NULL)
536 // Determine maximum packet size. Init with default value.
537 // New hi-speed devices from FTDI use a packet size of 512 bytes
538 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
539 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H)
544 if (libusb_get_device_descriptor(dev, &desc) < 0)
547 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
550 if (desc.bNumConfigurations > 0)
552 if (ftdi->interface < config0->bNumInterfaces)
554 struct libusb_interface interface = config0->interface[ftdi->interface];
555 if (interface.num_altsetting > 0)
557 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
558 if (descriptor.bNumEndpoints > 0)
560 packet_size = descriptor.endpoint[0].wMaxPacketSize;
566 libusb_free_config_descriptor (config0);
571 Opens a ftdi device given by an usb_device.
573 \param ftdi pointer to ftdi_context
574 \param dev libusb usb_dev to use
577 \retval -3: unable to config device
578 \retval -4: unable to open device
579 \retval -5: unable to claim device
580 \retval -6: reset failed
581 \retval -7: set baudrate failed
582 \retval -8: ftdi context invalid
583 \retval -9: libusb_get_device_descriptor() failed
584 \retval -10: libusb_get_config_descriptor() failed
585 \retval -11: libusb_detach_kernel_driver() failed
586 \retval -12: libusb_get_configuration() failed
588 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
590 struct libusb_device_descriptor desc;
591 struct libusb_config_descriptor *config0;
592 int cfg, cfg0, detach_errno = 0;
595 ftdi_error_return(-8, "ftdi context invalid");
597 if (libusb_open(dev, &ftdi->usb_dev) < 0)
598 ftdi_error_return(-4, "libusb_open() failed");
600 if (libusb_get_device_descriptor(dev, &desc) < 0)
601 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
603 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
604 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
605 cfg0 = config0->bConfigurationValue;
606 libusb_free_config_descriptor (config0);
608 // Try to detach ftdi_sio kernel module.
610 // The return code is kept in a separate variable and only parsed
611 // if usb_set_configuration() or usb_claim_interface() fails as the
612 // detach operation might be denied and everything still works fine.
613 // Likely scenario is a static ftdi_sio kernel module.
614 if (ftdi->module_detach_mode == AUTO_DETACH_SIO_MODULE)
616 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
617 detach_errno = errno;
619 else if (ftdi->module_detach_mode == AUTO_DETACH_REATACH_SIO_MODULE)
621 if (libusb_set_auto_detach_kernel_driver(ftdi->usb_dev, 1) != LIBUSB_SUCCESS)
622 detach_errno = errno;
625 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
626 ftdi_error_return(-12, "libusb_get_configuration () failed");
627 // set configuration (needed especially for windows)
628 // tolerate EBUSY: one device with one configuration, but two interfaces
629 // and libftdi sessions to both interfaces (e.g. FT2232)
630 if (desc.bNumConfigurations > 0 && cfg != cfg0)
632 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
634 ftdi_usb_close_internal (ftdi);
635 if (detach_errno == EPERM)
637 ftdi_error_return(-8, "inappropriate permissions on device!");
641 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
646 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
648 ftdi_usb_close_internal (ftdi);
649 if (detach_errno == EPERM)
651 ftdi_error_return(-8, "inappropriate permissions on device!");
655 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
659 if (ftdi_usb_reset (ftdi) != 0)
661 ftdi_usb_close_internal (ftdi);
662 ftdi_error_return(-6, "ftdi_usb_reset failed");
665 // Try to guess chip type
666 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
667 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
668 && desc.iSerialNumber == 0))
669 ftdi->type = TYPE_BM;
670 else if (desc.bcdDevice == 0x200)
671 ftdi->type = TYPE_AM;
672 else if (desc.bcdDevice == 0x500)
673 ftdi->type = TYPE_2232C;
674 else if (desc.bcdDevice == 0x600)
676 else if (desc.bcdDevice == 0x700)
677 ftdi->type = TYPE_2232H;
678 else if (desc.bcdDevice == 0x800)
679 ftdi->type = TYPE_4232H;
680 else if (desc.bcdDevice == 0x900)
681 ftdi->type = TYPE_232H;
682 else if (desc.bcdDevice == 0x1000)
683 ftdi->type = TYPE_230X;
685 // Determine maximum packet size
686 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
688 if (ftdi_set_baudrate (ftdi, 9600) != 0)
690 ftdi_usb_close_internal (ftdi);
691 ftdi_error_return(-7, "set baudrate failed");
694 ftdi_error_return(0, "all fine");
698 Opens the first device with a given vendor and product ids.
700 \param ftdi pointer to ftdi_context
701 \param vendor Vendor ID
702 \param product Product ID
704 \retval same as ftdi_usb_open_desc()
706 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
708 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
712 Opens the first device with a given, vendor id, product id,
713 description and serial.
715 \param ftdi pointer to ftdi_context
716 \param vendor Vendor ID
717 \param product Product ID
718 \param description Description to search for. Use NULL if not needed.
719 \param serial Serial to search for. Use NULL if not needed.
722 \retval -3: usb device not found
723 \retval -4: unable to open device
724 \retval -5: unable to claim device
725 \retval -6: reset failed
726 \retval -7: set baudrate failed
727 \retval -8: get product description failed
728 \retval -9: get serial number failed
729 \retval -12: libusb_get_device_list() failed
730 \retval -13: libusb_get_device_descriptor() failed
732 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
733 const char* description, const char* serial)
735 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
739 Opens the index-th device with a given, vendor id, product id,
740 description and serial.
742 \param ftdi pointer to ftdi_context
743 \param vendor Vendor ID
744 \param product Product ID
745 \param description Description to search for. Use NULL if not needed.
746 \param serial Serial to search for. Use NULL if not needed.
747 \param index Number of matching device to open if there are more than one, starts with 0.
750 \retval -1: usb_find_busses() failed
751 \retval -2: usb_find_devices() failed
752 \retval -3: usb device not found
753 \retval -4: unable to open device
754 \retval -5: unable to claim device
755 \retval -6: reset failed
756 \retval -7: set baudrate failed
757 \retval -8: get product description failed
758 \retval -9: get serial number failed
759 \retval -10: unable to close device
760 \retval -11: ftdi context invalid
761 \retval -12: libusb_get_device_list() failed
763 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
764 const char* description, const char* serial, unsigned int index)
767 libusb_device **devs;
772 ftdi_error_return(-11, "ftdi context invalid");
774 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
775 ftdi_error_return(-12, "libusb_get_device_list() failed");
777 while ((dev = devs[i++]) != NULL)
779 struct libusb_device_descriptor desc;
782 if (libusb_get_device_descriptor(dev, &desc) < 0)
783 ftdi_error_return_free_device_list(-13, "libusb_get_device_descriptor() failed", devs);
785 if (desc.idVendor == vendor && desc.idProduct == product)
787 if (libusb_open(dev, &ftdi->usb_dev) < 0)
788 ftdi_error_return_free_device_list(-4, "usb_open() failed", devs);
790 if (description != NULL)
792 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
794 ftdi_usb_close_internal (ftdi);
795 ftdi_error_return_free_device_list(-8, "unable to fetch product description", devs);
797 if (strncmp(string, description, sizeof(string)) != 0)
799 ftdi_usb_close_internal (ftdi);
805 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
807 ftdi_usb_close_internal (ftdi);
808 ftdi_error_return_free_device_list(-9, "unable to fetch serial number", devs);
810 if (strncmp(string, serial, sizeof(string)) != 0)
812 ftdi_usb_close_internal (ftdi);
817 ftdi_usb_close_internal (ftdi);
825 res = ftdi_usb_open_dev(ftdi, dev);
826 libusb_free_device_list(devs,1);
832 ftdi_error_return_free_device_list(-3, "device not found", devs);
836 Opens the device at a given USB bus and device address.
838 \param ftdi pointer to ftdi_context
839 \param bus Bus number
840 \param addr Device address
843 \retval -1: usb_find_busses() failed
844 \retval -2: usb_find_devices() failed
845 \retval -3: usb device not found
846 \retval -4: unable to open device
847 \retval -5: unable to claim device
848 \retval -6: reset failed
849 \retval -7: set baudrate failed
850 \retval -8: get product description failed
851 \retval -9: get serial number failed
852 \retval -10: unable to close device
853 \retval -11: ftdi context invalid
854 \retval -12: libusb_get_device_list() failed
856 int ftdi_usb_open_bus_addr(struct ftdi_context *ftdi, uint8_t bus, uint8_t addr)
859 libusb_device **devs;
863 ftdi_error_return(-11, "ftdi context invalid");
865 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
866 ftdi_error_return(-12, "libusb_get_device_list() failed");
868 while ((dev = devs[i++]) != NULL)
870 if (libusb_get_bus_number(dev) == bus && libusb_get_device_address(dev) == addr)
873 res = ftdi_usb_open_dev(ftdi, dev);
874 libusb_free_device_list(devs,1);
880 ftdi_error_return_free_device_list(-3, "device not found", devs);
884 Opens the ftdi-device described by a description-string.
885 Intended to be used for parsing a device-description given as commandline argument.
887 \param ftdi pointer to ftdi_context
888 \param description NULL-terminated description-string, using this format:
889 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
890 \li <tt>i:\<vendor>:\<product></tt> first device with given vendor and product id, ids can be decimal, octal (preceded by "0") or hex (preceded by "0x")
891 \li <tt>i:\<vendor>:\<product>:\<index></tt> as above with index being the number of the device (starting with 0) if there are more than one
892 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
894 \note The description format may be extended in later versions.
897 \retval -2: libusb_get_device_list() failed
898 \retval -3: usb device not found
899 \retval -4: unable to open device
900 \retval -5: unable to claim device
901 \retval -6: reset failed
902 \retval -7: set baudrate failed
903 \retval -8: get product description failed
904 \retval -9: get serial number failed
905 \retval -10: unable to close device
906 \retval -11: illegal description format
907 \retval -12: ftdi context invalid
909 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
912 ftdi_error_return(-12, "ftdi context invalid");
914 if (description[0] == 0 || description[1] != ':')
915 ftdi_error_return(-11, "illegal description format");
917 if (description[0] == 'd')
920 libusb_device **devs;
921 unsigned int bus_number, device_address;
924 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
925 ftdi_error_return(-2, "libusb_get_device_list() failed");
927 /* XXX: This doesn't handle symlinks/odd paths/etc... */
928 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
929 ftdi_error_return_free_device_list(-11, "illegal description format", devs);
931 while ((dev = devs[i++]) != NULL)
934 if (bus_number == libusb_get_bus_number (dev)
935 && device_address == libusb_get_device_address (dev))
937 ret = ftdi_usb_open_dev(ftdi, dev);
938 libusb_free_device_list(devs,1);
944 ftdi_error_return_free_device_list(-3, "device not found", devs);
946 else if (description[0] == 'i' || description[0] == 's')
949 unsigned int product;
950 unsigned int index=0;
951 const char *serial=NULL;
952 const char *startp, *endp;
955 startp=description+2;
956 vendor=strtoul((char*)startp,(char**)&endp,0);
957 if (*endp != ':' || endp == startp || errno != 0)
958 ftdi_error_return(-11, "illegal description format");
961 product=strtoul((char*)startp,(char**)&endp,0);
962 if (endp == startp || errno != 0)
963 ftdi_error_return(-11, "illegal description format");
965 if (description[0] == 'i' && *endp != 0)
967 /* optional index field in i-mode */
969 ftdi_error_return(-11, "illegal description format");
972 index=strtoul((char*)startp,(char**)&endp,0);
973 if (*endp != 0 || endp == startp || errno != 0)
974 ftdi_error_return(-11, "illegal description format");
976 if (description[0] == 's')
979 ftdi_error_return(-11, "illegal description format");
981 /* rest of the description is the serial */
985 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
989 ftdi_error_return(-11, "illegal description format");
994 Resets the ftdi device.
996 \param ftdi pointer to ftdi_context
999 \retval -1: FTDI reset failed
1000 \retval -2: USB device unavailable
1002 int ftdi_usb_reset(struct ftdi_context *ftdi)
1004 if (ftdi == NULL || ftdi->usb_dev == NULL)
1005 ftdi_error_return(-2, "USB device unavailable");
1007 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1008 SIO_RESET_REQUEST, SIO_RESET_SIO,
1009 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1010 ftdi_error_return(-1,"FTDI reset failed");
1012 // Invalidate data in the readbuffer
1013 ftdi->readbuffer_offset = 0;
1014 ftdi->readbuffer_remaining = 0;
1020 Clears the read buffer on the chip and the internal read buffer.
1021 This is the correct behavior for an RX flush.
1023 \param ftdi pointer to ftdi_context
1026 \retval -1: read buffer purge failed
1027 \retval -2: USB device unavailable
1029 int ftdi_tciflush(struct ftdi_context *ftdi)
1031 if (ftdi == NULL || ftdi->usb_dev == NULL)
1032 ftdi_error_return(-2, "USB device unavailable");
1034 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1035 SIO_RESET_REQUEST, SIO_TCIFLUSH,
1036 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1037 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
1039 // Invalidate data in the readbuffer
1040 ftdi->readbuffer_offset = 0;
1041 ftdi->readbuffer_remaining = 0;
1048 Clears the write buffer on the chip and the internal read buffer.
1049 This is incorrect behavior for an RX flush.
1051 \param ftdi pointer to ftdi_context
1054 \retval -1: write buffer purge failed
1055 \retval -2: USB device unavailable
1057 \deprecated Use \ref ftdi_tciflush(struct ftdi_context *ftdi)
1059 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
1061 if (ftdi == NULL || ftdi->usb_dev == NULL)
1062 ftdi_error_return(-2, "USB device unavailable");
1064 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1065 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
1066 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1067 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
1069 // Invalidate data in the readbuffer
1070 ftdi->readbuffer_offset = 0;
1071 ftdi->readbuffer_remaining = 0;
1077 Clears the write buffer on the chip.
1078 This is correct behavior for a TX flush.
1080 \param ftdi pointer to ftdi_context
1083 \retval -1: write buffer purge failed
1084 \retval -2: USB device unavailable
1086 int ftdi_tcoflush(struct ftdi_context *ftdi)
1088 if (ftdi == NULL || ftdi->usb_dev == NULL)
1089 ftdi_error_return(-2, "USB device unavailable");
1091 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1092 SIO_RESET_REQUEST, SIO_TCOFLUSH,
1093 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1094 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
1101 Clears the read buffer on the chip.
1102 This is incorrect behavior for a TX flush.
1104 \param ftdi pointer to ftdi_context
1107 \retval -1: read buffer purge failed
1108 \retval -2: USB device unavailable
1110 \deprecated Use \ref ftdi_tcoflush(struct ftdi_context *ftdi)
1112 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
1114 if (ftdi == NULL || ftdi->usb_dev == NULL)
1115 ftdi_error_return(-2, "USB device unavailable");
1117 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1118 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
1119 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1120 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
1126 Clears the RX and TX FIFOs on the chip and the internal read buffer.
1127 This is correct behavior for both RX and TX flush.
1129 \param ftdi pointer to ftdi_context
1132 \retval -1: read buffer purge failed
1133 \retval -2: write buffer purge failed
1134 \retval -3: USB device unavailable
1136 int ftdi_tcioflush(struct ftdi_context *ftdi)
1140 if (ftdi == NULL || ftdi->usb_dev == NULL)
1141 ftdi_error_return(-3, "USB device unavailable");
1143 result = ftdi_tcoflush(ftdi);
1147 result = ftdi_tciflush(ftdi);
1155 Clears the buffers on the chip and the internal read buffer.
1156 While coded incorrectly, the result is satisfactory.
1158 \param ftdi pointer to ftdi_context
1161 \retval -1: read buffer purge failed
1162 \retval -2: write buffer purge failed
1163 \retval -3: USB device unavailable
1165 \deprecated Use \ref ftdi_tcioflush(struct ftdi_context *ftdi)
1167 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
1171 if (ftdi == NULL || ftdi->usb_dev == NULL)
1172 ftdi_error_return(-3, "USB device unavailable");
1174 result = ftdi_usb_purge_rx_buffer(ftdi);
1178 result = ftdi_usb_purge_tx_buffer(ftdi);
1188 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
1190 \param ftdi pointer to ftdi_context
1193 \retval -1: usb_release failed
1194 \retval -3: ftdi context invalid
1196 int ftdi_usb_close(struct ftdi_context *ftdi)
1201 ftdi_error_return(-3, "ftdi context invalid");
1203 if (ftdi->usb_dev != NULL)
1204 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
1207 ftdi_usb_close_internal (ftdi);
1212 /* ftdi_to_clkbits_AM For the AM device, convert a requested baudrate
1213 to encoded divisor and the achievable baudrate
1214 Function is only used internally
1221 From /2, 0.125/ 0.25 and 0.5 steps may be taken
1222 The fractional part has frac_code encoding
1224 static int ftdi_to_clkbits_AM(int baudrate, unsigned long *encoded_divisor)
1227 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1228 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
1229 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
1230 int divisor, best_divisor, best_baud, best_baud_diff;
1232 divisor = 24000000 / baudrate;
1234 // Round down to supported fraction (AM only)
1235 divisor -= am_adjust_dn[divisor & 7];
1237 // Try this divisor and the one above it (because division rounds down)
1241 for (i = 0; i < 2; i++)
1243 int try_divisor = divisor + i;
1247 // Round up to supported divisor value
1248 if (try_divisor <= 8)
1250 // Round up to minimum supported divisor
1253 else if (divisor < 16)
1255 // AM doesn't support divisors 9 through 15 inclusive
1260 // Round up to supported fraction (AM only)
1261 try_divisor += am_adjust_up[try_divisor & 7];
1262 if (try_divisor > 0x1FFF8)
1264 // Round down to maximum supported divisor value (for AM)
1265 try_divisor = 0x1FFF8;
1268 // Get estimated baud rate (to nearest integer)
1269 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1270 // Get absolute difference from requested baud rate
1271 if (baud_estimate < baudrate)
1273 baud_diff = baudrate - baud_estimate;
1277 baud_diff = baud_estimate - baudrate;
1279 if (i == 0 || baud_diff < best_baud_diff)
1281 // Closest to requested baud rate so far
1282 best_divisor = try_divisor;
1283 best_baud = baud_estimate;
1284 best_baud_diff = baud_diff;
1287 // Spot on! No point trying
1292 // Encode the best divisor value
1293 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1294 // Deal with special cases for encoded value
1295 if (*encoded_divisor == 1)
1297 *encoded_divisor = 0; // 3000000 baud
1299 else if (*encoded_divisor == 0x4001)
1301 *encoded_divisor = 1; // 2000000 baud (BM only)
1306 /* ftdi_to_clkbits Convert a requested baudrate for a given system clock and predivisor
1307 to encoded divisor and the achievable baudrate
1308 Function is only used internally
1315 From /2, 0.125 steps may be taken.
1316 The fractional part has frac_code encoding
1318 value[13:0] of value is the divisor
1319 index[9] mean 12 MHz Base(120 MHz/10) rate versus 3 MHz (48 MHz/16) else
1321 H Type have all features above with
1322 {index[8],value[15:14]} is the encoded subdivisor
1324 FT232R, FT2232 and FT232BM have no option for 12 MHz and with
1325 {index[0],value[15:14]} is the encoded subdivisor
1327 AM Type chips have only four fractional subdivisors at value[15:14]
1328 for subdivisors 0, 0.5, 0.25, 0.125
1330 static int ftdi_to_clkbits(int baudrate, unsigned int clk, int clk_div, unsigned long *encoded_divisor)
1332 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1334 int divisor, best_divisor;
1335 if (baudrate >= clk/clk_div)
1337 *encoded_divisor = 0;
1338 best_baud = clk/clk_div;
1340 else if (baudrate >= clk/(clk_div + clk_div/2))
1342 *encoded_divisor = 1;
1343 best_baud = clk/(clk_div + clk_div/2);
1345 else if (baudrate >= clk/(2*clk_div))
1347 *encoded_divisor = 2;
1348 best_baud = clk/(2*clk_div);
1352 /* We divide by 16 to have 3 fractional bits and one bit for rounding */
1353 divisor = clk*16/clk_div / baudrate;
1354 if (divisor & 1) /* Decide if to round up or down*/
1355 best_divisor = divisor /2 +1;
1357 best_divisor = divisor/2;
1358 if(best_divisor > 0x20000)
1359 best_divisor = 0x1ffff;
1360 best_baud = clk*16/clk_div/best_divisor;
1361 if (best_baud & 1) /* Decide if to round up or down*/
1362 best_baud = best_baud /2 +1;
1364 best_baud = best_baud /2;
1365 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 0x7] << 14);
1370 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
1371 Function is only used internally
1374 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
1375 unsigned short *value, unsigned short *index)
1378 unsigned long encoded_divisor;
1386 #define H_CLK 120000000
1387 #define C_CLK 48000000
1388 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H) || (ftdi->type == TYPE_232H))
1390 if(baudrate*10 > H_CLK /0x3fff)
1392 /* On H Devices, use 12 000 000 Baudrate when possible
1393 We have a 14 bit divisor, a 1 bit divisor switch (10 or 16)
1394 three fractional bits and a 120 MHz clock
1395 Assume AN_120 "Sub-integer divisors between 0 and 2 are not allowed" holds for
1396 DIV/10 CLK too, so /1, /1.5 and /2 can be handled the same*/
1397 best_baud = ftdi_to_clkbits(baudrate, H_CLK, 10, &encoded_divisor);
1398 encoded_divisor |= 0x20000; /* switch on CLK/10*/
1401 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1403 else if ((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C) || (ftdi->type == TYPE_R) || (ftdi->type == TYPE_230X))
1405 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1409 best_baud = ftdi_to_clkbits_AM(baudrate, &encoded_divisor);
1411 // Split into "value" and "index" values
1412 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1413 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H)
1415 *index = (unsigned short)(encoded_divisor >> 8);
1417 *index |= ftdi->index;
1420 *index = (unsigned short)(encoded_divisor >> 16);
1422 // Return the nearest baud rate
1427 * @brief Wrapper function to export ftdi_convert_baudrate() to the unit test
1428 * Do not use, it's only for the unit test framework
1430 int convert_baudrate_UT_export(int baudrate, struct ftdi_context *ftdi,
1431 unsigned short *value, unsigned short *index)
1433 return ftdi_convert_baudrate(baudrate, ftdi, value, index);
1437 Sets the chip baud rate
1439 \param ftdi pointer to ftdi_context
1440 \param baudrate baud rate to set
1443 \retval -1: invalid baudrate
1444 \retval -2: setting baudrate failed
1445 \retval -3: USB device unavailable
1447 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1449 unsigned short value, index;
1450 int actual_baudrate;
1452 if (ftdi == NULL || ftdi->usb_dev == NULL)
1453 ftdi_error_return(-3, "USB device unavailable");
1455 if (ftdi->bitbang_enabled)
1457 baudrate = baudrate*4;
1460 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1461 if (actual_baudrate <= 0)
1462 ftdi_error_return (-1, "Silly baudrate <= 0.");
1464 // Check within tolerance (about 5%)
1465 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1466 || ((actual_baudrate < baudrate)
1467 ? (actual_baudrate * 21 < baudrate * 20)
1468 : (baudrate * 21 < actual_baudrate * 20)))
1469 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1471 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1472 SIO_SET_BAUDRATE_REQUEST, value,
1473 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1474 ftdi_error_return (-2, "Setting new baudrate failed");
1476 ftdi->baudrate = baudrate;
1481 Set (RS232) line characteristics.
1482 The break type can only be set via ftdi_set_line_property2()
1483 and defaults to "off".
1485 \param ftdi pointer to ftdi_context
1486 \param bits Number of bits
1487 \param sbit Number of stop bits
1488 \param parity Parity mode
1491 \retval -1: Setting line property failed
1493 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1494 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1496 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1500 Set (RS232) line characteristics
1502 \param ftdi pointer to ftdi_context
1503 \param bits Number of bits
1504 \param sbit Number of stop bits
1505 \param parity Parity mode
1506 \param break_type Break type
1509 \retval -1: Setting line property failed
1510 \retval -2: USB device unavailable
1512 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1513 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1514 enum ftdi_break_type break_type)
1516 unsigned short value = bits;
1518 if (ftdi == NULL || ftdi->usb_dev == NULL)
1519 ftdi_error_return(-2, "USB device unavailable");
1524 value |= (0x00 << 8);
1527 value |= (0x01 << 8);
1530 value |= (0x02 << 8);
1533 value |= (0x03 << 8);
1536 value |= (0x04 << 8);
1543 value |= (0x00 << 11);
1546 value |= (0x01 << 11);
1549 value |= (0x02 << 11);
1556 value |= (0x00 << 14);
1559 value |= (0x01 << 14);
1563 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1564 SIO_SET_DATA_REQUEST, value,
1565 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1566 ftdi_error_return (-1, "Setting new line property failed");
1572 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1574 \param ftdi pointer to ftdi_context
1575 \param buf Buffer with the data
1576 \param size Size of the buffer
1578 \retval -666: USB device unavailable
1579 \retval <0: error code from usb_bulk_write()
1580 \retval >0: number of bytes written
1582 int ftdi_write_data(struct ftdi_context *ftdi, const unsigned char *buf, int size)
1587 if (ftdi == NULL || ftdi->usb_dev == NULL)
1588 ftdi_error_return(-666, "USB device unavailable");
1590 while (offset < size)
1592 int write_size = ftdi->writebuffer_chunksize;
1594 if (offset+write_size > size)
1595 write_size = size-offset;
1597 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, (unsigned char *)buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1598 ftdi_error_return(-1, "usb bulk write failed");
1600 offset += actual_length;
1606 static void LIBUSB_CALL ftdi_read_data_cb(struct libusb_transfer *transfer)
1608 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1609 struct ftdi_context *ftdi = tc->ftdi;
1610 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1612 packet_size = ftdi->max_packet_size;
1614 actual_length = transfer->actual_length;
1616 if (actual_length > 2)
1618 // skip FTDI status bytes.
1619 // Maybe stored in the future to enable modem use
1620 num_of_chunks = actual_length / packet_size;
1621 chunk_remains = actual_length % packet_size;
1622 //printf("actual_length = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", actual_length, num_of_chunks, chunk_remains, ftdi->readbuffer_offset);
1624 ftdi->readbuffer_offset += 2;
1627 if (actual_length > packet_size - 2)
1629 for (i = 1; i < num_of_chunks; i++)
1630 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1631 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1633 if (chunk_remains > 2)
1635 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1636 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1638 actual_length -= 2*num_of_chunks;
1641 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1644 if (actual_length > 0)
1646 // data still fits in buf?
1647 if (tc->offset + actual_length <= tc->size)
1649 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1650 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1651 tc->offset += actual_length;
1653 ftdi->readbuffer_offset = 0;
1654 ftdi->readbuffer_remaining = 0;
1656 /* Did we read exactly the right amount of bytes? */
1657 if (tc->offset == tc->size)
1659 //printf("read_data exact rem %d offset %d\n",
1660 //ftdi->readbuffer_remaining, offset);
1667 // only copy part of the data or size <= readbuffer_chunksize
1668 int part_size = tc->size - tc->offset;
1669 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1670 tc->offset += part_size;
1672 ftdi->readbuffer_offset += part_size;
1673 ftdi->readbuffer_remaining = actual_length - part_size;
1675 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1676 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1683 if (transfer->status == LIBUSB_TRANSFER_CANCELLED)
1684 tc->completed = LIBUSB_TRANSFER_CANCELLED;
1687 ret = libusb_submit_transfer (transfer);
1694 static void LIBUSB_CALL ftdi_write_data_cb(struct libusb_transfer *transfer)
1696 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1697 struct ftdi_context *ftdi = tc->ftdi;
1699 tc->offset += transfer->actual_length;
1701 if (tc->offset == tc->size)
1707 int write_size = ftdi->writebuffer_chunksize;
1710 if (tc->offset + write_size > tc->size)
1711 write_size = tc->size - tc->offset;
1713 transfer->length = write_size;
1714 transfer->buffer = tc->buf + tc->offset;
1716 if (transfer->status == LIBUSB_TRANSFER_CANCELLED)
1717 tc->completed = LIBUSB_TRANSFER_CANCELLED;
1720 ret = libusb_submit_transfer (transfer);
1729 Writes data to the chip. Does not wait for completion of the transfer
1730 nor does it make sure that the transfer was successful.
1732 Use libusb 1.0 asynchronous API.
1734 \param ftdi pointer to ftdi_context
1735 \param buf Buffer with the data
1736 \param size Size of the buffer
1738 \retval NULL: Some error happens when submit transfer
1739 \retval !NULL: Pointer to a ftdi_transfer_control
1742 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1744 struct ftdi_transfer_control *tc;
1745 struct libusb_transfer *transfer;
1746 int write_size, ret;
1748 if (ftdi == NULL || ftdi->usb_dev == NULL)
1751 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1755 transfer = libusb_alloc_transfer(0);
1768 if (size < (int)ftdi->writebuffer_chunksize)
1771 write_size = ftdi->writebuffer_chunksize;
1773 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf,
1774 write_size, ftdi_write_data_cb, tc,
1775 ftdi->usb_write_timeout);
1776 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1778 ret = libusb_submit_transfer(transfer);
1781 libusb_free_transfer(transfer);
1785 tc->transfer = transfer;
1791 Reads data from the chip. Does not wait for completion of the transfer
1792 nor does it make sure that the transfer was successful.
1794 Use libusb 1.0 asynchronous API.
1796 \param ftdi pointer to ftdi_context
1797 \param buf Buffer with the data
1798 \param size Size of the buffer
1800 \retval NULL: Some error happens when submit transfer
1801 \retval !NULL: Pointer to a ftdi_transfer_control
1804 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1806 struct ftdi_transfer_control *tc;
1807 struct libusb_transfer *transfer;
1810 if (ftdi == NULL || ftdi->usb_dev == NULL)
1813 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1821 if (size <= (int)ftdi->readbuffer_remaining)
1823 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1826 ftdi->readbuffer_remaining -= size;
1827 ftdi->readbuffer_offset += size;
1829 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1833 tc->transfer = NULL;
1838 if (ftdi->readbuffer_remaining != 0)
1840 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1842 tc->offset = ftdi->readbuffer_remaining;
1847 transfer = libusb_alloc_transfer(0);
1854 ftdi->readbuffer_remaining = 0;
1855 ftdi->readbuffer_offset = 0;
1857 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi_read_data_cb, tc, ftdi->usb_read_timeout);
1858 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1860 ret = libusb_submit_transfer(transfer);
1863 libusb_free_transfer(transfer);
1867 tc->transfer = transfer;
1873 Wait for completion of the transfer.
1875 Use libusb 1.0 asynchronous API.
1877 \param tc pointer to ftdi_transfer_control
1879 \retval < 0: Some error happens
1880 \retval >= 0: Data size transferred
1883 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1886 struct timeval to = { 0, 0 };
1887 while (!tc->completed)
1889 ret = libusb_handle_events_timeout_completed(tc->ftdi->usb_ctx,
1890 &to, &tc->completed);
1893 if (ret == LIBUSB_ERROR_INTERRUPTED)
1895 libusb_cancel_transfer(tc->transfer);
1896 while (!tc->completed)
1897 if (libusb_handle_events_timeout_completed(tc->ftdi->usb_ctx,
1898 &to, &tc->completed) < 0)
1900 libusb_free_transfer(tc->transfer);
1908 * tc->transfer could be NULL if "(size <= ftdi->readbuffer_remaining)"
1909 * at ftdi_read_data_submit(). Therefore, we need to check it here.
1913 if (tc->transfer->status != LIBUSB_TRANSFER_COMPLETED)
1915 libusb_free_transfer(tc->transfer);
1922 Cancel transfer and wait for completion.
1924 Use libusb 1.0 asynchronous API.
1926 \param tc pointer to ftdi_transfer_control
1927 \param to pointer to timeout value or NULL for infinite
1930 void ftdi_transfer_data_cancel(struct ftdi_transfer_control *tc,
1931 struct timeval * to)
1933 struct timeval tv = { 0, 0 };
1935 if (!tc->completed && tc->transfer != NULL)
1940 libusb_cancel_transfer(tc->transfer);
1941 while (!tc->completed)
1943 if (libusb_handle_events_timeout_completed(tc->ftdi->usb_ctx, to, &tc->completed) < 0)
1949 libusb_free_transfer(tc->transfer);
1955 Configure write buffer chunk size.
1958 \param ftdi pointer to ftdi_context
1959 \param chunksize Chunk size
1962 \retval -1: ftdi context invalid
1964 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1967 ftdi_error_return(-1, "ftdi context invalid");
1969 ftdi->writebuffer_chunksize = chunksize;
1974 Get write buffer chunk size.
1976 \param ftdi pointer to ftdi_context
1977 \param chunksize Pointer to store chunk size in
1980 \retval -1: ftdi context invalid
1982 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1985 ftdi_error_return(-1, "ftdi context invalid");
1987 *chunksize = ftdi->writebuffer_chunksize;
1992 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1994 Automatically strips the two modem status bytes transfered during every read.
1996 \param ftdi pointer to ftdi_context
1997 \param buf Buffer to store data in
1998 \param size Size of the buffer
2000 \retval -666: USB device unavailable
2001 \retval <0: error code from libusb_bulk_transfer()
2002 \retval 0: no data was available
2003 \retval >0: number of bytes read
2006 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
2008 int offset = 0, ret, i, num_of_chunks, chunk_remains;
2010 int actual_length = 1;
2012 if (ftdi == NULL || ftdi->usb_dev == NULL)
2013 ftdi_error_return(-666, "USB device unavailable");
2015 // Packet size sanity check (avoid division by zero)
2016 packet_size = ftdi->max_packet_size;
2017 if (packet_size == 0)
2018 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
2020 // everything we want is still in the readbuffer?
2021 if (size <= (int)ftdi->readbuffer_remaining)
2023 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
2026 ftdi->readbuffer_remaining -= size;
2027 ftdi->readbuffer_offset += size;
2029 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
2033 // something still in the readbuffer, but not enough to satisfy 'size'?
2034 if (ftdi->readbuffer_remaining != 0)
2036 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
2039 offset += ftdi->readbuffer_remaining;
2041 // do the actual USB read
2042 while (offset < size && actual_length > 0)
2044 ftdi->readbuffer_remaining = 0;
2045 ftdi->readbuffer_offset = 0;
2046 /* returns how much received */
2047 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
2049 ftdi_error_return(ret, "usb bulk read failed");
2051 if (actual_length > 2)
2053 // skip FTDI status bytes.
2054 // Maybe stored in the future to enable modem use
2055 num_of_chunks = actual_length / packet_size;
2056 chunk_remains = actual_length % packet_size;
2057 //printf("actual_length = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", actual_length, num_of_chunks, chunk_remains, ftdi->readbuffer_offset);
2059 ftdi->readbuffer_offset += 2;
2062 if (actual_length > packet_size - 2)
2064 for (i = 1; i < num_of_chunks; i++)
2065 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
2066 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
2068 if (chunk_remains > 2)
2070 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
2071 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
2073 actual_length -= 2*num_of_chunks;
2076 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
2079 else if (actual_length <= 2)
2081 // no more data to read?
2084 if (actual_length > 0)
2086 // data still fits in buf?
2087 if (offset+actual_length <= size)
2089 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
2090 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
2091 offset += actual_length;
2093 /* Did we read exactly the right amount of bytes? */
2095 //printf("read_data exact rem %d offset %d\n",
2096 //ftdi->readbuffer_remaining, offset);
2101 // only copy part of the data or size <= readbuffer_chunksize
2102 int part_size = size-offset;
2103 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
2105 ftdi->readbuffer_offset += part_size;
2106 ftdi->readbuffer_remaining = actual_length-part_size;
2107 offset += part_size;
2109 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
2110 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
2121 Configure read buffer chunk size.
2124 Automatically reallocates the buffer.
2126 \param ftdi pointer to ftdi_context
2127 \param chunksize Chunk size
2130 \retval -1: ftdi context invalid
2132 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
2134 unsigned char *new_buf;
2137 ftdi_error_return(-1, "ftdi context invalid");
2139 // Invalidate all remaining data
2140 ftdi->readbuffer_offset = 0;
2141 ftdi->readbuffer_remaining = 0;
2143 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
2144 which is defined in libusb-1.0. Otherwise, each USB read request will
2145 be divided into multiple URBs. This will cause issues on Linux kernel
2146 older than 2.6.32. */
2147 if (chunksize > 16384)
2151 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
2152 ftdi_error_return(-1, "out of memory for readbuffer");
2154 ftdi->readbuffer = new_buf;
2155 ftdi->readbuffer_chunksize = chunksize;
2161 Get read buffer chunk size.
2163 \param ftdi pointer to ftdi_context
2164 \param chunksize Pointer to store chunk size in
2167 \retval -1: FTDI context invalid
2169 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
2172 ftdi_error_return(-1, "FTDI context invalid");
2174 *chunksize = ftdi->readbuffer_chunksize;
2179 Enable/disable bitbang modes.
2181 \param ftdi pointer to ftdi_context
2182 \param bitmask Bitmask to configure lines.
2183 HIGH/ON value configures a line as output.
2184 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
2187 \retval -1: can't enable bitbang mode
2188 \retval -2: USB device unavailable
2190 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
2192 unsigned short usb_val;
2194 if (ftdi == NULL || ftdi->usb_dev == NULL)
2195 ftdi_error_return(-2, "USB device unavailable");
2197 usb_val = bitmask; // low byte: bitmask
2198 usb_val |= (mode << 8);
2199 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
2200 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a BM/2232C type chip?");
2202 ftdi->bitbang_mode = mode;
2203 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
2208 Disable bitbang mode.
2210 \param ftdi pointer to ftdi_context
2213 \retval -1: can't disable bitbang mode
2214 \retval -2: USB device unavailable
2216 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
2218 if (ftdi == NULL || ftdi->usb_dev == NULL)
2219 ftdi_error_return(-2, "USB device unavailable");
2221 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_BITMODE_REQUEST, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
2222 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
2224 ftdi->bitbang_enabled = 0;
2230 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
2232 \param ftdi pointer to ftdi_context
2233 \param pins Pointer to store pins into
2236 \retval -1: read pins failed
2237 \retval -2: USB device unavailable
2239 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
2241 if (ftdi == NULL || ftdi->usb_dev == NULL)
2242 ftdi_error_return(-2, "USB device unavailable");
2244 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_PINS_REQUEST, 0, ftdi->index, (unsigned char *)pins, 1, ftdi->usb_read_timeout) != 1)
2245 ftdi_error_return(-1, "read pins failed");
2253 The FTDI chip keeps data in the internal buffer for a specific
2254 amount of time if the buffer is not full yet to decrease
2255 load on the usb bus.
2257 \param ftdi pointer to ftdi_context
2258 \param latency Value between 1 and 255
2261 \retval -1: latency out of range
2262 \retval -2: unable to set latency timer
2263 \retval -3: USB device unavailable
2265 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
2267 unsigned short usb_val;
2270 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
2272 if (ftdi == NULL || ftdi->usb_dev == NULL)
2273 ftdi_error_return(-3, "USB device unavailable");
2276 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_LATENCY_TIMER_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
2277 ftdi_error_return(-2, "unable to set latency timer");
2285 \param ftdi pointer to ftdi_context
2286 \param latency Pointer to store latency value in
2289 \retval -1: unable to get latency timer
2290 \retval -2: USB device unavailable
2292 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
2294 unsigned short usb_val;
2296 if (ftdi == NULL || ftdi->usb_dev == NULL)
2297 ftdi_error_return(-2, "USB device unavailable");
2299 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_GET_LATENCY_TIMER_REQUEST, 0, ftdi->index, (unsigned char *)&usb_val, 1, ftdi->usb_read_timeout) != 1)
2300 ftdi_error_return(-1, "reading latency timer failed");
2302 *latency = (unsigned char)usb_val;
2307 Poll modem status information
2309 This function allows the retrieve the two status bytes of the device.
2310 The device sends these bytes also as a header for each read access
2311 where they are discarded by ftdi_read_data(). The chip generates
2312 the two stripped status bytes in the absence of data every 40 ms.
2314 Layout of the first byte:
2315 - B0..B3 - must be 0
2316 - B4 Clear to send (CTS)
2319 - B5 Data set ready (DTS)
2322 - B6 Ring indicator (RI)
2325 - B7 Receive line signal detect (RLSD)
2329 Layout of the second byte:
2330 - B0 Data ready (DR)
2331 - B1 Overrun error (OE)
2332 - B2 Parity error (PE)
2333 - B3 Framing error (FE)
2334 - B4 Break interrupt (BI)
2335 - B5 Transmitter holding register (THRE)
2336 - B6 Transmitter empty (TEMT)
2337 - B7 Error in RCVR FIFO
2339 \param ftdi pointer to ftdi_context
2340 \param status Pointer to store status information in. Must be two bytes.
2343 \retval -1: unable to retrieve status information
2344 \retval -2: USB device unavailable
2346 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
2350 if (ftdi == NULL || ftdi->usb_dev == NULL)
2351 ftdi_error_return(-2, "USB device unavailable");
2353 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_POLL_MODEM_STATUS_REQUEST, 0, ftdi->index, (unsigned char *)usb_val, 2, ftdi->usb_read_timeout) != 2)
2354 ftdi_error_return(-1, "getting modem status failed");
2356 *status = (usb_val[1] << 8) | (usb_val[0] & 0xFF);
2362 Set flowcontrol for ftdi chip
2364 Note: Do not use this function to enable XON/XOFF mode, use ftdi_setflowctrl_xonxoff() instead.
2366 \param ftdi pointer to ftdi_context
2367 \param flowctrl flow control to use. should be
2368 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS
2371 \retval -1: set flow control failed
2372 \retval -2: USB device unavailable
2374 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
2376 if (ftdi == NULL || ftdi->usb_dev == NULL)
2377 ftdi_error_return(-2, "USB device unavailable");
2379 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2380 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
2381 NULL, 0, ftdi->usb_write_timeout) < 0)
2382 ftdi_error_return(-1, "set flow control failed");
2388 Set XON/XOFF flowcontrol for ftdi chip
2390 \param ftdi pointer to ftdi_context
2391 \param xon character code used to resume transmission
2392 \param xoff character code used to pause transmission
2395 \retval -1: set flow control failed
2396 \retval -2: USB device unavailable
2398 int ftdi_setflowctrl_xonxoff(struct ftdi_context *ftdi, unsigned char xon, unsigned char xoff)
2400 if (ftdi == NULL || ftdi->usb_dev == NULL)
2401 ftdi_error_return(-2, "USB device unavailable");
2403 uint16_t xonxoff = xon | (xoff << 8);
2404 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2405 SIO_SET_FLOW_CTRL_REQUEST, xonxoff, (SIO_XON_XOFF_HS | ftdi->index),
2406 NULL, 0, ftdi->usb_write_timeout) < 0)
2407 ftdi_error_return(-1, "set flow control failed");
2415 \param ftdi pointer to ftdi_context
2416 \param state state to set line to (1 or 0)
2419 \retval -1: set dtr failed
2420 \retval -2: USB device unavailable
2422 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2424 unsigned short usb_val;
2426 if (ftdi == NULL || ftdi->usb_dev == NULL)
2427 ftdi_error_return(-2, "USB device unavailable");
2430 usb_val = SIO_SET_DTR_HIGH;
2432 usb_val = SIO_SET_DTR_LOW;
2434 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2435 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2436 NULL, 0, ftdi->usb_write_timeout) < 0)
2437 ftdi_error_return(-1, "set dtr failed");
2445 \param ftdi pointer to ftdi_context
2446 \param state state to set line to (1 or 0)
2449 \retval -1: set rts failed
2450 \retval -2: USB device unavailable
2452 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2454 unsigned short usb_val;
2456 if (ftdi == NULL || ftdi->usb_dev == NULL)
2457 ftdi_error_return(-2, "USB device unavailable");
2460 usb_val = SIO_SET_RTS_HIGH;
2462 usb_val = SIO_SET_RTS_LOW;
2464 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2465 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2466 NULL, 0, ftdi->usb_write_timeout) < 0)
2467 ftdi_error_return(-1, "set of rts failed");
2473 Set dtr and rts line in one pass
2475 \param ftdi pointer to ftdi_context
2476 \param dtr DTR state to set line to (1 or 0)
2477 \param rts RTS state to set line to (1 or 0)
2480 \retval -1: set dtr/rts failed
2481 \retval -2: USB device unavailable
2483 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2485 unsigned short usb_val;
2487 if (ftdi == NULL || ftdi->usb_dev == NULL)
2488 ftdi_error_return(-2, "USB device unavailable");
2491 usb_val = SIO_SET_DTR_HIGH;
2493 usb_val = SIO_SET_DTR_LOW;
2496 usb_val |= SIO_SET_RTS_HIGH;
2498 usb_val |= SIO_SET_RTS_LOW;
2500 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2501 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2502 NULL, 0, ftdi->usb_write_timeout) < 0)
2503 ftdi_error_return(-1, "set of rts/dtr failed");
2509 Set the special event character
2511 \param ftdi pointer to ftdi_context
2512 \param eventch Event character
2513 \param enable 0 to disable the event character, non-zero otherwise
2516 \retval -1: unable to set event character
2517 \retval -2: USB device unavailable
2519 int ftdi_set_event_char(struct ftdi_context *ftdi,
2520 unsigned char eventch, unsigned char enable)
2522 unsigned short usb_val;
2524 if (ftdi == NULL || ftdi->usb_dev == NULL)
2525 ftdi_error_return(-2, "USB device unavailable");
2531 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_EVENT_CHAR_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
2532 ftdi_error_return(-1, "setting event character failed");
2540 \param ftdi pointer to ftdi_context
2541 \param errorch Error character
2542 \param enable 0 to disable the error character, non-zero otherwise
2545 \retval -1: unable to set error character
2546 \retval -2: USB device unavailable
2548 int ftdi_set_error_char(struct ftdi_context *ftdi,
2549 unsigned char errorch, unsigned char enable)
2551 unsigned short usb_val;
2553 if (ftdi == NULL || ftdi->usb_dev == NULL)
2554 ftdi_error_return(-2, "USB device unavailable");
2560 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_ERROR_CHAR_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
2561 ftdi_error_return(-1, "setting error character failed");
2567 Init eeprom with default values for the connected device
2568 \param ftdi pointer to ftdi_context
2569 \param manufacturer String to use as Manufacturer
2570 \param product String to use as Product description
2571 \param serial String to use as Serial number description
2574 \retval -1: No struct ftdi_context
2575 \retval -2: No struct ftdi_eeprom
2576 \retval -3: No connected device or device not yet opened
2578 int ftdi_eeprom_initdefaults(struct ftdi_context *ftdi, char * manufacturer,
2579 char * product, char * serial)
2581 struct ftdi_eeprom *eeprom;
2584 ftdi_error_return(-1, "No struct ftdi_context");
2586 if (ftdi->eeprom == NULL)
2587 ftdi_error_return(-2,"No struct ftdi_eeprom");
2589 eeprom = ftdi->eeprom;
2590 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2592 if (ftdi->usb_dev == NULL)
2593 ftdi_error_return(-3, "No connected device or device not yet opened");
2595 eeprom->vendor_id = 0x0403;
2596 eeprom->use_serial = 1;
2597 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM) ||
2598 (ftdi->type == TYPE_R))
2599 eeprom->product_id = 0x6001;
2600 else if (ftdi->type == TYPE_4232H)
2601 eeprom->product_id = 0x6011;
2602 else if (ftdi->type == TYPE_232H)
2603 eeprom->product_id = 0x6014;
2604 else if (ftdi->type == TYPE_230X)
2605 eeprom->product_id = 0x6015;
2607 eeprom->product_id = 0x6010;
2609 if (ftdi->type == TYPE_AM)
2610 eeprom->usb_version = 0x0101;
2612 eeprom->usb_version = 0x0200;
2613 eeprom->max_power = 100;
2615 if (eeprom->manufacturer)
2616 free (eeprom->manufacturer);
2617 eeprom->manufacturer = NULL;
2620 eeprom->manufacturer = (char *)malloc(strlen(manufacturer)+1);
2621 if (eeprom->manufacturer)
2622 strcpy(eeprom->manufacturer, manufacturer);
2625 if (eeprom->product)
2626 free (eeprom->product);
2627 eeprom->product = NULL;
2630 eeprom->product = (char *)malloc(strlen(product)+1);
2631 if (eeprom->product)
2632 strcpy(eeprom->product, product);
2636 const char* default_product;
2639 case TYPE_AM: default_product = "AM"; break;
2640 case TYPE_BM: default_product = "BM"; break;
2641 case TYPE_2232C: default_product = "Dual RS232"; break;
2642 case TYPE_R: default_product = "FT232R USB UART"; break;
2643 case TYPE_2232H: default_product = "Dual RS232-HS"; break;
2644 case TYPE_4232H: default_product = "FT4232H"; break;
2645 case TYPE_232H: default_product = "Single-RS232-HS"; break;
2646 case TYPE_230X: default_product = "FT230X Basic UART"; break;
2648 ftdi_error_return(-3, "Unknown chip type");
2650 eeprom->product = (char *)malloc(strlen(default_product) +1);
2651 if (eeprom->product)
2652 strcpy(eeprom->product, default_product);
2656 free (eeprom->serial);
2657 eeprom->serial = NULL;
2660 eeprom->serial = (char *)malloc(strlen(serial)+1);
2662 strcpy(eeprom->serial, serial);
2665 if (ftdi->type == TYPE_R)
2667 eeprom->max_power = 90;
2668 eeprom->size = 0x80;
2669 eeprom->cbus_function[0] = CBUS_TXLED;
2670 eeprom->cbus_function[1] = CBUS_RXLED;
2671 eeprom->cbus_function[2] = CBUS_TXDEN;
2672 eeprom->cbus_function[3] = CBUS_PWREN;
2673 eeprom->cbus_function[4] = CBUS_SLEEP;
2675 else if (ftdi->type == TYPE_230X)
2677 eeprom->max_power = 90;
2678 eeprom->size = 0x100;
2679 eeprom->cbus_function[0] = CBUSX_TXDEN;
2680 eeprom->cbus_function[1] = CBUSX_RXLED;
2681 eeprom->cbus_function[2] = CBUSX_TXLED;
2682 eeprom->cbus_function[3] = CBUSX_SLEEP;
2686 if(ftdi->type == TYPE_232H)
2689 for (i=0; i<10; i++)
2690 eeprom->cbus_function[i] = CBUSH_TRISTATE;
2697 eeprom->release_number = 0x0200;
2700 eeprom->release_number = 0x0400;
2703 eeprom->release_number = 0x0500;
2706 eeprom->release_number = 0x0600;
2709 eeprom->release_number = 0x0700;
2712 eeprom->release_number = 0x0800;
2715 eeprom->release_number = 0x0900;
2718 eeprom->release_number = 0x1000;
2721 eeprom->release_number = 0x00;
2726 int ftdi_eeprom_set_strings(struct ftdi_context *ftdi, char * manufacturer,
2727 char * product, char * serial)
2729 struct ftdi_eeprom *eeprom;
2732 ftdi_error_return(-1, "No struct ftdi_context");
2734 if (ftdi->eeprom == NULL)
2735 ftdi_error_return(-2,"No struct ftdi_eeprom");
2737 eeprom = ftdi->eeprom;
2739 if (ftdi->usb_dev == NULL)
2740 ftdi_error_return(-3, "No connected device or device not yet opened");
2744 if (eeprom->manufacturer)
2745 free (eeprom->manufacturer);
2746 eeprom->manufacturer = (char *)malloc(strlen(manufacturer)+1);
2747 if (eeprom->manufacturer)
2748 strcpy(eeprom->manufacturer, manufacturer);
2753 if (eeprom->product)
2754 free (eeprom->product);
2755 eeprom->product = (char *)malloc(strlen(product)+1);
2756 if (eeprom->product)
2757 strcpy(eeprom->product, product);
2763 free (eeprom->serial);
2764 eeprom->serial = (char *)malloc(strlen(serial)+1);
2767 strcpy(eeprom->serial, serial);
2768 eeprom->use_serial = 1;
2775 Return device ID strings from the eeprom. Device needs to be connected.
2777 The parameters manufacturer, description and serial may be NULL
2778 or pointer to buffers to store the fetched strings.
2780 \param ftdi pointer to ftdi_context
2781 \param manufacturer Store manufacturer string here if not NULL
2782 \param mnf_len Buffer size of manufacturer string
2783 \param product Store product description string here if not NULL
2784 \param prod_len Buffer size of product description string
2785 \param serial Store serial string here if not NULL
2786 \param serial_len Buffer size of serial string
2789 \retval -1: ftdi context invalid
2790 \retval -2: ftdi eeprom buffer invalid
2792 int ftdi_eeprom_get_strings(struct ftdi_context *ftdi,
2793 char *manufacturer, int mnf_len,
2794 char *product, int prod_len,
2795 char *serial, int serial_len)
2797 struct ftdi_eeprom *eeprom;
2800 ftdi_error_return(-1, "No struct ftdi_context");
2801 if (ftdi->eeprom == NULL)
2802 ftdi_error_return(-2, "No struct ftdi_eeprom");
2804 eeprom = ftdi->eeprom;
2808 strncpy(manufacturer, eeprom->manufacturer, mnf_len);
2810 manufacturer[mnf_len - 1] = '\0';
2815 strncpy(product, eeprom->product, prod_len);
2817 product[prod_len - 1] = '\0';
2822 strncpy(serial, eeprom->serial, serial_len);
2824 serial[serial_len - 1] = '\0';
2830 /*FTD2XX doesn't check for values not fitting in the ACBUS Signal options*/
2831 void set_ft232h_cbus(struct ftdi_eeprom *eeprom, unsigned char * output)
2836 int mode_low, mode_high;
2837 if (eeprom->cbus_function[2*i]> CBUSH_CLK7_5)
2838 mode_low = CBUSH_TRISTATE;
2840 mode_low = eeprom->cbus_function[2*i];
2841 if (eeprom->cbus_function[2*i+1]> CBUSH_CLK7_5)
2842 mode_high = CBUSH_TRISTATE;
2844 mode_high = eeprom->cbus_function[2*i+1];
2846 output[0x18+i] = (mode_high <<4) | mode_low;
2849 /* Return the bits for the encoded EEPROM Structure of a requested Mode
2852 static unsigned char type2bit(unsigned char type, enum ftdi_chip_type chip)
2861 case CHANNEL_IS_UART: return 0;
2862 case CHANNEL_IS_FIFO: return 0x01;
2863 case CHANNEL_IS_OPTO: return 0x02;
2864 case CHANNEL_IS_CPU : return 0x04;
2872 case CHANNEL_IS_UART : return 0;
2873 case CHANNEL_IS_FIFO : return 0x01;
2874 case CHANNEL_IS_OPTO : return 0x02;
2875 case CHANNEL_IS_CPU : return 0x04;
2876 case CHANNEL_IS_FT1284 : return 0x08;
2884 case CHANNEL_IS_UART : return 0;
2885 case CHANNEL_IS_FIFO : return 0x01;
2889 case TYPE_230X: /* FT230X is only UART */
2896 Build binary buffer from ftdi_eeprom structure.
2897 Output is suitable for ftdi_write_eeprom().
2899 \param ftdi pointer to ftdi_context
2901 \retval >=0: size of eeprom user area in bytes
2902 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2903 \retval -2: Invalid eeprom or ftdi pointer
2904 \retval -3: Invalid cbus function setting (FIXME: Not in the code?)
2905 \retval -4: Chip doesn't support invert (FIXME: Not in the code?)
2906 \retval -5: Chip doesn't support high current drive (FIXME: Not in the code?)
2907 \retval -6: No connected EEPROM or EEPROM Type unknown
2909 int ftdi_eeprom_build(struct ftdi_context *ftdi)
2911 unsigned char i, j, eeprom_size_mask;
2912 unsigned short checksum, value;
2913 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2914 int user_area_size, free_start, free_end;
2915 struct ftdi_eeprom *eeprom;
2916 unsigned char * output;
2919 ftdi_error_return(-2,"No context");
2920 if (ftdi->eeprom == NULL)
2921 ftdi_error_return(-2,"No eeprom structure");
2923 eeprom= ftdi->eeprom;
2924 output = eeprom->buf;
2926 if (eeprom->chip == -1)
2927 ftdi_error_return(-6,"No connected EEPROM or EEPROM type unknown");
2929 if (eeprom->size == -1)
2931 if ((eeprom->chip == 0x56) || (eeprom->chip == 0x66))
2932 eeprom->size = 0x100;
2934 eeprom->size = 0x80;
2937 if (eeprom->manufacturer != NULL)
2938 manufacturer_size = strlen(eeprom->manufacturer);
2939 if (eeprom->product != NULL)
2940 product_size = strlen(eeprom->product);
2941 if (eeprom->serial != NULL)
2942 serial_size = strlen(eeprom->serial);
2944 // eeprom size check
2950 user_area_size = 96; // base size for strings (total of 48 characters)
2953 user_area_size = 90; // two extra config bytes and 4 bytes PnP stuff
2956 user_area_size = 88; // four extra config bytes + 4 bytes PnP stuff
2958 case TYPE_2232H: // six extra config bytes + 4 bytes PnP stuff
2960 user_area_size = 86;
2963 user_area_size = 80;
2969 user_area_size -= (manufacturer_size + product_size + serial_size) * 2;
2971 if (user_area_size < 0)
2972 ftdi_error_return(-1,"eeprom size exceeded");
2975 if (ftdi->type == TYPE_230X)
2977 /* FT230X have a reserved section in the middle of the MTP,
2978 which cannot be written to, but must be included in the checksum */
2979 memset(ftdi->eeprom->buf, 0, 0x80);
2980 memset((ftdi->eeprom->buf + 0xa0), 0, (FTDI_MAX_EEPROM_SIZE - 0xa0));
2984 memset(ftdi->eeprom->buf, 0, FTDI_MAX_EEPROM_SIZE);
2987 // Bytes and Bits set for all Types
2989 // Addr 02: Vendor ID
2990 output[0x02] = eeprom->vendor_id;
2991 output[0x03] = eeprom->vendor_id >> 8;
2993 // Addr 04: Product ID
2994 output[0x04] = eeprom->product_id;
2995 output[0x05] = eeprom->product_id >> 8;
2997 // Addr 06: Device release number (0400h for BM features)
2998 output[0x06] = eeprom->release_number;
2999 output[0x07] = eeprom->release_number >> 8;
3001 // Addr 08: Config descriptor
3003 // Bit 6: 1 if this device is self powered, 0 if bus powered
3004 // Bit 5: 1 if this device uses remote wakeup
3005 // Bit 4-0: reserved - 0
3007 if (eeprom->self_powered)
3009 if (eeprom->remote_wakeup)
3013 // Addr 09: Max power consumption: max power = value * 2 mA
3014 output[0x09] = eeprom->max_power / MAX_POWER_MILLIAMP_PER_UNIT;
3016 if ((ftdi->type != TYPE_AM) && (ftdi->type != TYPE_230X))
3018 // Addr 0A: Chip configuration
3019 // Bit 7: 0 - reserved
3020 // Bit 6: 0 - reserved
3021 // Bit 5: 0 - reserved
3022 // Bit 4: 1 - Change USB version
3023 // Bit 3: 1 - Use the serial number string
3024 // Bit 2: 1 - Enable suspend pull downs for lower power
3025 // Bit 1: 1 - Out EndPoint is Isochronous
3026 // Bit 0: 1 - In EndPoint is Isochronous
3029 if (eeprom->in_is_isochronous)
3031 if (eeprom->out_is_isochronous)
3037 // Strings start at 0x94 (TYPE_AM, TYPE_BM)
3038 // 0x96 (TYPE_2232C), 0x98 (TYPE_R) and 0x9a (TYPE_x232H)
3059 /* Wrap around 0x80 for 128 byte EEPROMS (Internale and 93x46) */
3060 eeprom_size_mask = eeprom->size -1;
3061 free_end = i & eeprom_size_mask;
3063 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
3064 // Addr 0F: Length of manufacturer string
3065 // Output manufacturer
3066 output[0x0E] = i; // calculate offset
3067 output[i & eeprom_size_mask] = manufacturer_size*2 + 2, i++;
3068 output[i & eeprom_size_mask] = 0x03, i++; // type: string
3069 for (j = 0; j < manufacturer_size; j++)
3071 output[i & eeprom_size_mask] = eeprom->manufacturer[j], i++;
3072 output[i & eeprom_size_mask] = 0x00, i++;
3074 output[0x0F] = manufacturer_size*2 + 2;
3076 // Addr 10: Offset of the product string + 0x80, calculated later
3077 // Addr 11: Length of product string
3078 output[0x10] = i | 0x80; // calculate offset
3079 output[i & eeprom_size_mask] = product_size*2 + 2, i++;
3080 output[i & eeprom_size_mask] = 0x03, i++;
3081 for (j = 0; j < product_size; j++)
3083 output[i & eeprom_size_mask] = eeprom->product[j], i++;
3084 output[i & eeprom_size_mask] = 0x00, i++;
3086 output[0x11] = product_size*2 + 2;
3088 // Addr 12: Offset of the serial string + 0x80, calculated later
3089 // Addr 13: Length of serial string
3090 output[0x12] = i | 0x80; // calculate offset
3091 output[i & eeprom_size_mask] = serial_size*2 + 2, i++;
3092 output[i & eeprom_size_mask] = 0x03, i++;
3093 for (j = 0; j < serial_size; j++)
3095 output[i & eeprom_size_mask] = eeprom->serial[j], i++;
3096 output[i & eeprom_size_mask] = 0x00, i++;
3099 // Legacy port name and PnP fields for FT2232 and newer chips
3100 if (ftdi->type > TYPE_BM)
3102 output[i & eeprom_size_mask] = 0x02; /* as seen when written with FTD2XX */
3104 output[i & eeprom_size_mask] = 0x03; /* as seen when written with FTD2XX */
3106 output[i & eeprom_size_mask] = eeprom->is_not_pnp; /* as seen when written with FTD2XX */
3110 output[0x13] = serial_size*2 + 2;
3112 if (ftdi->type > TYPE_AM) /* use_serial not used in AM devices */
3114 if (eeprom->use_serial)
3115 output[0x0A] |= USE_SERIAL_NUM;
3117 output[0x0A] &= ~USE_SERIAL_NUM;
3120 /* Bytes and Bits specific to (some) types
3121 Write linear, as this allows easier fixing*/
3127 output[0x0C] = eeprom->usb_version & 0xff;
3128 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
3129 if (eeprom->use_usb_version)
3130 output[0x0A] |= USE_USB_VERSION_BIT;
3132 output[0x0A] &= ~USE_USB_VERSION_BIT;
3137 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232C);
3138 if ( eeprom->channel_a_driver == DRIVER_VCP)
3139 output[0x00] |= DRIVER_VCP;
3141 output[0x00] &= ~DRIVER_VCP;
3143 if ( eeprom->high_current_a == HIGH_CURRENT_DRIVE)
3144 output[0x00] |= HIGH_CURRENT_DRIVE;
3146 output[0x00] &= ~HIGH_CURRENT_DRIVE;
3148 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232C);
3149 if ( eeprom->channel_b_driver == DRIVER_VCP)
3150 output[0x01] |= DRIVER_VCP;
3152 output[0x01] &= ~DRIVER_VCP;
3154 if ( eeprom->high_current_b == HIGH_CURRENT_DRIVE)
3155 output[0x01] |= HIGH_CURRENT_DRIVE;
3157 output[0x01] &= ~HIGH_CURRENT_DRIVE;
3159 if (eeprom->in_is_isochronous)
3160 output[0x0A] |= 0x1;
3162 output[0x0A] &= ~0x1;
3163 if (eeprom->out_is_isochronous)
3164 output[0x0A] |= 0x2;
3166 output[0x0A] &= ~0x2;
3167 if (eeprom->suspend_pull_downs)
3168 output[0x0A] |= 0x4;
3170 output[0x0A] &= ~0x4;
3171 if (eeprom->use_usb_version)
3172 output[0x0A] |= USE_USB_VERSION_BIT;
3174 output[0x0A] &= ~USE_USB_VERSION_BIT;
3176 output[0x0C] = eeprom->usb_version & 0xff;
3177 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
3178 output[0x14] = eeprom->chip;
3181 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_R);
3182 if (eeprom->high_current == HIGH_CURRENT_DRIVE_R)
3183 output[0x00] |= HIGH_CURRENT_DRIVE_R;
3184 if (eeprom->external_oscillator)
3185 output[0x00] |= 0x02;
3186 output[0x01] = 0x40; /* Hard coded Endpoint Size*/
3188 if (eeprom->suspend_pull_downs)
3189 output[0x0A] |= 0x4;
3191 output[0x0A] &= ~0x4;
3192 output[0x0B] = eeprom->invert;
3193 output[0x0C] = eeprom->usb_version & 0xff;
3194 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
3196 if (eeprom->cbus_function[0] > CBUS_BB_RD)
3197 output[0x14] = CBUS_TXLED;
3199 output[0x14] = eeprom->cbus_function[0];
3201 if (eeprom->cbus_function[1] > CBUS_BB_RD)
3202 output[0x14] |= CBUS_RXLED<<4;
3204 output[0x14] |= eeprom->cbus_function[1]<<4;
3206 if (eeprom->cbus_function[2] > CBUS_BB_RD)
3207 output[0x15] = CBUS_TXDEN;
3209 output[0x15] = eeprom->cbus_function[2];
3211 if (eeprom->cbus_function[3] > CBUS_BB_RD)
3212 output[0x15] |= CBUS_PWREN<<4;
3214 output[0x15] |= eeprom->cbus_function[3]<<4;
3216 if (eeprom->cbus_function[4] > CBUS_CLK6)
3217 output[0x16] = CBUS_SLEEP;
3219 output[0x16] = eeprom->cbus_function[4];
3222 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232H);
3223 if ( eeprom->channel_a_driver == DRIVER_VCP)
3224 output[0x00] |= DRIVER_VCP;
3226 output[0x00] &= ~DRIVER_VCP;
3228 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232H);
3229 if ( eeprom->channel_b_driver == DRIVER_VCP)
3230 output[0x01] |= DRIVER_VCP;
3232 output[0x01] &= ~DRIVER_VCP;
3233 if (eeprom->suspend_dbus7 == SUSPEND_DBUS7_BIT)
3234 output[0x01] |= SUSPEND_DBUS7_BIT;
3236 output[0x01] &= ~SUSPEND_DBUS7_BIT;
3238 if (eeprom->suspend_pull_downs)
3239 output[0x0A] |= 0x4;
3241 output[0x0A] &= ~0x4;
3243 if (eeprom->group0_drive > DRIVE_16MA)
3244 output[0x0c] |= DRIVE_16MA;
3246 output[0x0c] |= eeprom->group0_drive;
3247 if (eeprom->group0_schmitt == IS_SCHMITT)
3248 output[0x0c] |= IS_SCHMITT;
3249 if (eeprom->group0_slew == SLOW_SLEW)
3250 output[0x0c] |= SLOW_SLEW;
3252 if (eeprom->group1_drive > DRIVE_16MA)
3253 output[0x0c] |= DRIVE_16MA<<4;
3255 output[0x0c] |= eeprom->group1_drive<<4;
3256 if (eeprom->group1_schmitt == IS_SCHMITT)
3257 output[0x0c] |= IS_SCHMITT<<4;
3258 if (eeprom->group1_slew == SLOW_SLEW)
3259 output[0x0c] |= SLOW_SLEW<<4;
3261 if (eeprom->group2_drive > DRIVE_16MA)
3262 output[0x0d] |= DRIVE_16MA;
3264 output[0x0d] |= eeprom->group2_drive;
3265 if (eeprom->group2_schmitt == IS_SCHMITT)
3266 output[0x0d] |= IS_SCHMITT;
3267 if (eeprom->group2_slew == SLOW_SLEW)
3268 output[0x0d] |= SLOW_SLEW;
3270 if (eeprom->group3_drive > DRIVE_16MA)
3271 output[0x0d] |= DRIVE_16MA<<4;
3273 output[0x0d] |= eeprom->group3_drive<<4;
3274 if (eeprom->group3_schmitt == IS_SCHMITT)
3275 output[0x0d] |= IS_SCHMITT<<4;
3276 if (eeprom->group3_slew == SLOW_SLEW)
3277 output[0x0d] |= SLOW_SLEW<<4;
3279 output[0x18] = eeprom->chip;
3283 if (eeprom->channel_a_driver == DRIVER_VCP)
3284 output[0x00] |= DRIVER_VCP;
3286 output[0x00] &= ~DRIVER_VCP;
3287 if (eeprom->channel_b_driver == DRIVER_VCP)
3288 output[0x01] |= DRIVER_VCP;
3290 output[0x01] &= ~DRIVER_VCP;
3291 if (eeprom->channel_c_driver == DRIVER_VCP)
3292 output[0x00] |= (DRIVER_VCP << 4);
3294 output[0x00] &= ~(DRIVER_VCP << 4);
3295 if (eeprom->channel_d_driver == DRIVER_VCP)
3296 output[0x01] |= (DRIVER_VCP << 4);
3298 output[0x01] &= ~(DRIVER_VCP << 4);
3300 if (eeprom->suspend_pull_downs)
3301 output[0x0a] |= 0x4;
3303 output[0x0a] &= ~0x4;
3305 if (eeprom->channel_a_rs485enable)
3306 output[0x0b] |= CHANNEL_IS_RS485 << 0;
3308 output[0x0b] &= ~(CHANNEL_IS_RS485 << 0);
3309 if (eeprom->channel_b_rs485enable)
3310 output[0x0b] |= CHANNEL_IS_RS485 << 1;
3312 output[0x0b] &= ~(CHANNEL_IS_RS485 << 1);
3313 if (eeprom->channel_c_rs485enable)
3314 output[0x0b] |= CHANNEL_IS_RS485 << 2;
3316 output[0x0b] &= ~(CHANNEL_IS_RS485 << 2);
3317 if (eeprom->channel_d_rs485enable)
3318 output[0x0b] |= CHANNEL_IS_RS485 << 3;
3320 output[0x0b] &= ~(CHANNEL_IS_RS485 << 3);
3322 if (eeprom->group0_drive > DRIVE_16MA)
3323 output[0x0c] |= DRIVE_16MA;
3325 output[0x0c] |= eeprom->group0_drive;
3326 if (eeprom->group0_schmitt == IS_SCHMITT)
3327 output[0x0c] |= IS_SCHMITT;
3328 if (eeprom->group0_slew == SLOW_SLEW)
3329 output[0x0c] |= SLOW_SLEW;
3331 if (eeprom->group1_drive > DRIVE_16MA)
3332 output[0x0c] |= DRIVE_16MA<<4;
3334 output[0x0c] |= eeprom->group1_drive<<4;
3335 if (eeprom->group1_schmitt == IS_SCHMITT)
3336 output[0x0c] |= IS_SCHMITT<<4;
3337 if (eeprom->group1_slew == SLOW_SLEW)
3338 output[0x0c] |= SLOW_SLEW<<4;
3340 if (eeprom->group2_drive > DRIVE_16MA)
3341 output[0x0d] |= DRIVE_16MA;
3343 output[0x0d] |= eeprom->group2_drive;
3344 if (eeprom->group2_schmitt == IS_SCHMITT)
3345 output[0x0d] |= IS_SCHMITT;
3346 if (eeprom->group2_slew == SLOW_SLEW)
3347 output[0x0d] |= SLOW_SLEW;
3349 if (eeprom->group3_drive > DRIVE_16MA)
3350 output[0x0d] |= DRIVE_16MA<<4;
3352 output[0x0d] |= eeprom->group3_drive<<4;
3353 if (eeprom->group3_schmitt == IS_SCHMITT)
3354 output[0x0d] |= IS_SCHMITT<<4;
3355 if (eeprom->group3_slew == SLOW_SLEW)
3356 output[0x0d] |= SLOW_SLEW<<4;
3358 output[0x18] = eeprom->chip;
3362 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_232H);
3363 if ( eeprom->channel_a_driver == DRIVER_VCP)
3364 output[0x00] |= DRIVER_VCPH;
3366 output[0x00] &= ~DRIVER_VCPH;
3367 if (eeprom->powersave)
3368 output[0x01] |= POWER_SAVE_DISABLE_H;
3370 output[0x01] &= ~POWER_SAVE_DISABLE_H;
3372 if (eeprom->suspend_pull_downs)
3373 output[0x0a] |= 0x4;
3375 output[0x0a] &= ~0x4;
3377 if (eeprom->clock_polarity)
3378 output[0x01] |= FT1284_CLK_IDLE_STATE;
3380 output[0x01] &= ~FT1284_CLK_IDLE_STATE;
3381 if (eeprom->data_order)
3382 output[0x01] |= FT1284_DATA_LSB;
3384 output[0x01] &= ~FT1284_DATA_LSB;
3385 if (eeprom->flow_control)
3386 output[0x01] |= FT1284_FLOW_CONTROL;
3388 output[0x01] &= ~FT1284_FLOW_CONTROL;
3389 if (eeprom->group0_drive > DRIVE_16MA)
3390 output[0x0c] |= DRIVE_16MA;
3392 output[0x0c] |= eeprom->group0_drive;
3393 if (eeprom->group0_schmitt == IS_SCHMITT)
3394 output[0x0c] |= IS_SCHMITT;
3395 if (eeprom->group0_slew == SLOW_SLEW)
3396 output[0x0c] |= SLOW_SLEW;
3398 if (eeprom->group1_drive > DRIVE_16MA)
3399 output[0x0d] |= DRIVE_16MA;
3401 output[0x0d] |= eeprom->group1_drive;
3402 if (eeprom->group1_schmitt == IS_SCHMITT)
3403 output[0x0d] |= IS_SCHMITT;
3404 if (eeprom->group1_slew == SLOW_SLEW)
3405 output[0x0d] |= SLOW_SLEW;
3407 set_ft232h_cbus(eeprom, output);
3409 output[0x1e] = eeprom->chip;
3410 fprintf(stderr,"FIXME: Build FT232H specific EEPROM settings\n");
3413 output[0x00] = 0x80; /* Actually, leave the default value */
3414 /*FIXME: Make DBUS & CBUS Control configurable*/
3415 output[0x0c] = 0; /* DBUS drive 4mA, CBUS drive 4 mA like factory default */
3416 for (j = 0; j <= 6; j++)
3418 output[0x1a + j] = eeprom->cbus_function[j];
3420 output[0x0b] = eeprom->invert;
3424 /* First address without use */
3444 /* Arbitrary user data */
3445 if (eeprom->user_data && eeprom->user_data_size >= 0)
3447 if (eeprom->user_data_addr < free_start)
3448 fprintf(stderr,"Warning, user data starts inside the generated data!\n");
3449 if (eeprom->user_data_addr + eeprom->user_data_size >= free_end)
3450 fprintf(stderr,"Warning, user data overlaps the strings area!\n");
3451 if (eeprom->user_data_addr + eeprom->user_data_size > eeprom->size)
3452 ftdi_error_return(-1,"eeprom size exceeded");
3453 memcpy(output + eeprom->user_data_addr, eeprom->user_data, eeprom->user_data_size);
3456 // calculate checksum
3459 for (i = 0; i < eeprom->size/2-1; i++)
3461 if ((ftdi->type == TYPE_230X) && (i == 0x12))
3463 /* FT230X has a user section in the MTP which is not part of the checksum */
3466 if ((ftdi->type == TYPE_230X) && (i >= 0x40) && (i < 0x50)) {
3468 if (ftdi_read_eeprom_location(ftdi, i, &data)) {
3469 fprintf(stderr, "Reading Factory Configuration Data failed\n");
3475 value = output[i*2];
3476 value += output[(i*2)+1] << 8;
3478 checksum = value^checksum;
3479 checksum = (checksum << 1) | (checksum >> 15);
3482 output[eeprom->size-2] = checksum;
3483 output[eeprom->size-1] = checksum >> 8;
3485 eeprom->initialized_for_connected_device = 1;
3486 return user_area_size;
3488 /* Decode the encoded EEPROM field for the FTDI Mode into a value for the abstracted
3491 * FTD2XX doesn't allow to set multiple bits in the interface mode bitfield, and so do we
3493 static unsigned char bit2type(unsigned char bits)
3497 case 0: return CHANNEL_IS_UART;
3498 case 1: return CHANNEL_IS_FIFO;
3499 case 2: return CHANNEL_IS_OPTO;
3500 case 4: return CHANNEL_IS_CPU;
3501 case 8: return CHANNEL_IS_FT1284;
3503 fprintf(stderr," Unexpected value %d for Hardware Interface type\n",
3508 /* Decode 230X / 232R type chips invert bits
3509 * Prints directly to stdout.
3511 static void print_inverted_bits(int invert)
3513 const char *r_bits[] = {"TXD","RXD","RTS","CTS","DTR","DSR","DCD","RI"};
3516 fprintf(stdout,"Inverted bits:");
3518 if ((invert & (1<<i)) == (1<<i))
3519 fprintf(stdout," %s",r_bits[i]);
3521 fprintf(stdout,"\n");
3524 Decode binary EEPROM image into an ftdi_eeprom structure.
3526 For FT-X devices use AN_201 FT-X MTP memory Configuration to decode.
3528 \param ftdi pointer to ftdi_context
3529 \param verbose Decode EEPROM on stdout
3532 \retval -1: something went wrong
3534 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
3535 FIXME: Strings are malloc'ed here and should be freed somewhere
3537 int ftdi_eeprom_decode(struct ftdi_context *ftdi, int verbose)
3540 unsigned short checksum, eeprom_checksum, value;
3541 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
3543 struct ftdi_eeprom *eeprom;
3544 unsigned char *buf = NULL;
3547 ftdi_error_return(-1,"No context");
3548 if (ftdi->eeprom == NULL)
3549 ftdi_error_return(-1,"No eeprom structure");
3551 eeprom = ftdi->eeprom;
3552 eeprom_size = eeprom->size;
3553 buf = ftdi->eeprom->buf;
3555 // Addr 02: Vendor ID
3556 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
3558 // Addr 04: Product ID
3559 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
3561 // Addr 06: Device release number
3562 eeprom->release_number = buf[0x06] + (buf[0x07]<<8);
3564 // Addr 08: Config descriptor
3566 // Bit 6: 1 if this device is self powered, 0 if bus powered
3567 // Bit 5: 1 if this device uses remote wakeup
3568 eeprom->self_powered = buf[0x08] & 0x40;
3569 eeprom->remote_wakeup = buf[0x08] & 0x20;
3571 // Addr 09: Max power consumption: max power = value * 2 mA
3572 eeprom->max_power = MAX_POWER_MILLIAMP_PER_UNIT * buf[0x09];
3574 // Addr 0A: Chip configuration
3575 // Bit 7: 0 - reserved
3576 // Bit 6: 0 - reserved
3577 // Bit 5: 0 - reserved
3578 // Bit 4: 1 - Change USB version on BM and 2232C
3579 // Bit 3: 1 - Use the serial number string
3580 // Bit 2: 1 - Enable suspend pull downs for lower power
3581 // Bit 1: 1 - Out EndPoint is Isochronous
3582 // Bit 0: 1 - In EndPoint is Isochronous
3584 eeprom->in_is_isochronous = buf[0x0A]&0x01;
3585 eeprom->out_is_isochronous = buf[0x0A]&0x02;
3586 eeprom->suspend_pull_downs = buf[0x0A]&0x04;
3587 eeprom->use_serial = !!(buf[0x0A] & USE_SERIAL_NUM);
3588 eeprom->use_usb_version = !!(buf[0x0A] & USE_USB_VERSION_BIT);
3590 // Addr 0C: USB version low byte when 0x0A
3591 // Addr 0D: USB version high byte when 0x0A
3592 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
3594 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
3595 // Addr 0F: Length of manufacturer string
3596 manufacturer_size = buf[0x0F]/2;
3597 if (eeprom->manufacturer)
3598 free(eeprom->manufacturer);
3599 if (manufacturer_size > 0)
3601 eeprom->manufacturer = (char *)malloc(manufacturer_size);
3602 if (eeprom->manufacturer)
3604 // Decode manufacturer
3605 i = buf[0x0E] & (eeprom_size -1); // offset
3606 for (j=0; j<manufacturer_size-1; j++)
3608 eeprom->manufacturer[j] = buf[2*j+i+2];
3610 eeprom->manufacturer[j] = '\0';
3613 else eeprom->manufacturer = NULL;
3615 // Addr 10: Offset of the product string + 0x80, calculated later
3616 // Addr 11: Length of product string
3617 if (eeprom->product)
3618 free(eeprom->product);
3619 product_size = buf[0x11]/2;
3620 if (product_size > 0)
3622 eeprom->product = (char *)malloc(product_size);
3623 if (eeprom->product)
3625 // Decode product name
3626 i = buf[0x10] & (eeprom_size -1); // offset
3627 for (j=0; j<product_size-1; j++)
3629 eeprom->product[j] = buf[2*j+i+2];
3631 eeprom->product[j] = '\0';
3634 else eeprom->product = NULL;
3636 // Addr 12: Offset of the serial string + 0x80, calculated later
3637 // Addr 13: Length of serial string
3639 free(eeprom->serial);
3640 serial_size = buf[0x13]/2;
3641 if (serial_size > 0)
3643 eeprom->serial = (char *)malloc(serial_size);
3647 i = buf[0x12] & (eeprom_size -1); // offset
3648 for (j=0; j<serial_size-1; j++)
3650 eeprom->serial[j] = buf[2*j+i+2];
3652 eeprom->serial[j] = '\0';
3655 else eeprom->serial = NULL;
3660 for (i = 0; i < eeprom_size/2-1; i++)
3662 if ((ftdi->type == TYPE_230X) && (i == 0x12))
3664 /* FT230X has a user section in the MTP which is not part of the checksum */
3668 value += buf[(i*2)+1] << 8;
3670 checksum = value^checksum;
3671 checksum = (checksum << 1) | (checksum >> 15);
3674 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
3676 if (eeprom_checksum != checksum)
3678 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
3679 ftdi_error_return(-1,"EEPROM checksum error");
3682 eeprom->channel_a_type = 0;
3683 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM))
3687 else if (ftdi->type == TYPE_2232C)
3689 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3690 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3691 eeprom->high_current_a = buf[0x00] & HIGH_CURRENT_DRIVE;
3692 eeprom->channel_b_type = buf[0x01] & 0x7;
3693 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3694 eeprom->high_current_b = buf[0x01] & HIGH_CURRENT_DRIVE;
3695 eeprom->chip = buf[0x14];
3697 else if (ftdi->type == TYPE_R)
3699 /* TYPE_R flags D2XX, not VCP as all others*/
3700 eeprom->channel_a_driver = ~buf[0x00] & DRIVER_VCP;
3701 eeprom->high_current = buf[0x00] & HIGH_CURRENT_DRIVE_R;
3702 eeprom->external_oscillator = buf[0x00] & 0x02;
3703 if ( (buf[0x01]&0x40) != 0x40)
3705 "TYPE_R EEPROM byte[0x01] Bit 6 unexpected Endpoint size."
3706 " If this happened with the\n"
3707 " EEPROM programmed by FTDI tools, please report "
3708 "to libftdi@developer.intra2net.com\n");
3710 eeprom->chip = buf[0x16];
3711 // Addr 0B: Invert data lines
3712 // Works only on FT232R, not FT245R, but no way to distinguish
3713 eeprom->invert = buf[0x0B];
3714 // Addr 14: CBUS function: CBUS0, CBUS1
3715 // Addr 15: CBUS function: CBUS2, CBUS3
3716 // Addr 16: CBUS function: CBUS5
3717 eeprom->cbus_function[0] = buf[0x14] & 0x0f;
3718 eeprom->cbus_function[1] = (buf[0x14] >> 4) & 0x0f;
3719 eeprom->cbus_function[2] = buf[0x15] & 0x0f;
3720 eeprom->cbus_function[3] = (buf[0x15] >> 4) & 0x0f;
3721 eeprom->cbus_function[4] = buf[0x16] & 0x0f;
3723 else if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
3725 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3726 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3728 if (ftdi->type == TYPE_2232H)
3730 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3731 eeprom->channel_b_type = bit2type(buf[0x01] & 0x7);
3732 eeprom->suspend_dbus7 = buf[0x01] & SUSPEND_DBUS7_BIT;
3736 eeprom->channel_c_driver = (buf[0x00] >> 4) & DRIVER_VCP;
3737 eeprom->channel_d_driver = (buf[0x01] >> 4) & DRIVER_VCP;
3738 eeprom->channel_a_rs485enable = buf[0x0b] & (CHANNEL_IS_RS485 << 0);
3739 eeprom->channel_b_rs485enable = buf[0x0b] & (CHANNEL_IS_RS485 << 1);
3740 eeprom->channel_c_rs485enable = buf[0x0b] & (CHANNEL_IS_RS485 << 2);
3741 eeprom->channel_d_rs485enable = buf[0x0b] & (CHANNEL_IS_RS485 << 3);
3744 eeprom->chip = buf[0x18];
3745 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3746 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3747 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3748 eeprom->group1_drive = (buf[0x0c] >> 4) & 0x3;
3749 eeprom->group1_schmitt = (buf[0x0c] >> 4) & IS_SCHMITT;
3750 eeprom->group1_slew = (buf[0x0c] >> 4) & SLOW_SLEW;
3751 eeprom->group2_drive = buf[0x0d] & DRIVE_16MA;
3752 eeprom->group2_schmitt = buf[0x0d] & IS_SCHMITT;
3753 eeprom->group2_slew = buf[0x0d] & SLOW_SLEW;
3754 eeprom->group3_drive = (buf[0x0d] >> 4) & DRIVE_16MA;
3755 eeprom->group3_schmitt = (buf[0x0d] >> 4) & IS_SCHMITT;
3756 eeprom->group3_slew = (buf[0x0d] >> 4) & SLOW_SLEW;
3758 else if (ftdi->type == TYPE_232H)
3760 eeprom->channel_a_type = buf[0x00] & 0xf;
3761 eeprom->channel_a_driver = (buf[0x00] & DRIVER_VCPH)?DRIVER_VCP:0;
3762 eeprom->clock_polarity = buf[0x01] & FT1284_CLK_IDLE_STATE;
3763 eeprom->data_order = buf[0x01] & FT1284_DATA_LSB;
3764 eeprom->flow_control = buf[0x01] & FT1284_FLOW_CONTROL;
3765 eeprom->powersave = buf[0x01] & POWER_SAVE_DISABLE_H;
3766 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3767 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3768 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3769 eeprom->group1_drive = buf[0x0d] & DRIVE_16MA;
3770 eeprom->group1_schmitt = buf[0x0d] & IS_SCHMITT;
3771 eeprom->group1_slew = buf[0x0d] & SLOW_SLEW;
3775 eeprom->cbus_function[2*i ] = buf[0x18+i] & 0x0f;
3776 eeprom->cbus_function[2*i+1] = (buf[0x18+i] >> 4) & 0x0f;
3778 eeprom->chip = buf[0x1e];
3779 /*FIXME: Decipher more values*/
3781 else if (ftdi->type == TYPE_230X)
3785 eeprom->cbus_function[i] = buf[0x1a + i] & 0xFF;
3787 eeprom->group0_drive = buf[0x0c] & 0x03;
3788 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3789 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3790 eeprom->group1_drive = (buf[0x0c] >> 4) & 0x03;
3791 eeprom->group1_schmitt = (buf[0x0c] >> 4) & IS_SCHMITT;
3792 eeprom->group1_slew = (buf[0x0c] >> 4) & SLOW_SLEW;
3794 eeprom->invert = buf[0xb];
3799 const char *channel_mode[] = {"UART", "FIFO", "CPU", "OPTO", "FT1284"};
3800 fprintf(stdout, "VID: 0x%04x\n",eeprom->vendor_id);
3801 fprintf(stdout, "PID: 0x%04x\n",eeprom->product_id);
3802 fprintf(stdout, "Release: 0x%04x\n",eeprom->release_number);
3804 if (eeprom->self_powered)
3805 fprintf(stdout, "Self-Powered%s", (eeprom->remote_wakeup)?", USB Remote Wake Up\n":"\n");
3807 fprintf(stdout, "Bus Powered: %3d mA%s", eeprom->max_power,
3808 (eeprom->remote_wakeup)?" USB Remote Wake Up\n":"\n");
3809 if (eeprom->manufacturer)
3810 fprintf(stdout, "Manufacturer: %s\n",eeprom->manufacturer);
3811 if (eeprom->product)
3812 fprintf(stdout, "Product: %s\n",eeprom->product);
3814 fprintf(stdout, "Serial: %s\n",eeprom->serial);
3815 fprintf(stdout, "Checksum : %04x\n", checksum);
3816 if (ftdi->type == TYPE_R) {
3817 fprintf(stdout, "Internal EEPROM\n");
3818 fprintf(stdout,"Oscillator: %s\n", eeprom->external_oscillator?"External":"Internal");
3820 else if (eeprom->chip >= 0x46)
3821 fprintf(stdout, "Attached EEPROM: 93x%02x\n", eeprom->chip);
3822 if (eeprom->suspend_dbus7)
3823 fprintf(stdout, "Suspend on DBUS7\n");
3824 if (eeprom->suspend_pull_downs)
3825 fprintf(stdout, "Pull IO pins low during suspend\n");
3826 if(eeprom->powersave)
3828 if(ftdi->type >= TYPE_232H)
3829 fprintf(stdout,"Enter low power state on ACBUS7\n");
3831 if (eeprom->remote_wakeup)
3832 fprintf(stdout, "Enable Remote Wake Up\n");
3833 fprintf(stdout, "PNP: %d\n",(eeprom->is_not_pnp)?0:1);
3834 if (ftdi->type >= TYPE_2232C)
3835 fprintf(stdout,"Channel A has Mode %s%s%s\n",
3836 channel_mode[eeprom->channel_a_type],
3837 (eeprom->channel_a_driver)?" VCP":"",
3838 (eeprom->high_current_a)?" High Current IO":"");
3839 if (ftdi->type == TYPE_232H)
3841 fprintf(stdout,"FT1284 Mode Clock is idle %s, %s first, %sFlow Control\n",
3842 (eeprom->clock_polarity)?"HIGH":"LOW",
3843 (eeprom->data_order)?"LSB":"MSB",
3844 (eeprom->flow_control)?"":"No ");
3846 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
3847 fprintf(stdout,"Channel B has Mode %s%s%s\n",
3848 channel_mode[eeprom->channel_b_type],
3849 (eeprom->channel_b_driver)?" VCP":"",
3850 (eeprom->high_current_b)?" High Current IO":"");
3851 if (((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C)) &&
3852 eeprom->use_usb_version)
3853 fprintf(stdout,"Use explicit USB Version %04x\n",eeprom->usb_version);
3855 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
3857 fprintf(stdout,"%s has %d mA drive%s%s\n",
3858 (ftdi->type == TYPE_2232H)?"AL":"A",
3859 (eeprom->group0_drive+1) *4,
3860 (eeprom->group0_schmitt)?" Schmitt Input":"",
3861 (eeprom->group0_slew)?" Slow Slew":"");
3862 fprintf(stdout,"%s has %d mA drive%s%s\n",
3863 (ftdi->type == TYPE_2232H)?"AH":"B",
3864 (eeprom->group1_drive+1) *4,
3865 (eeprom->group1_schmitt)?" Schmitt Input":"",
3866 (eeprom->group1_slew)?" Slow Slew":"");
3867 fprintf(stdout,"%s has %d mA drive%s%s\n",
3868 (ftdi->type == TYPE_2232H)?"BL":"C",
3869 (eeprom->group2_drive+1) *4,
3870 (eeprom->group2_schmitt)?" Schmitt Input":"",
3871 (eeprom->group2_slew)?" Slow Slew":"");
3872 fprintf(stdout,"%s has %d mA drive%s%s\n",
3873 (ftdi->type == TYPE_2232H)?"BH":"D",
3874 (eeprom->group3_drive+1) *4,
3875 (eeprom->group3_schmitt)?" Schmitt Input":"",
3876 (eeprom->group3_slew)?" Slow Slew":"");
3878 else if (ftdi->type == TYPE_232H)
3880 const char *cbush_mux[] = {"TRISTATE","TXLED","RXLED", "TXRXLED","PWREN",
3881 "SLEEP","DRIVE_0","DRIVE_1","IOMODE","TXDEN",
3882 "CLK30","CLK15","CLK7_5"
3884 fprintf(stdout,"ACBUS has %d mA drive%s%s\n",
3885 (eeprom->group0_drive+1) *4,
3886 (eeprom->group0_schmitt)?" Schmitt Input":"",
3887 (eeprom->group0_slew)?" Slow Slew":"");
3888 fprintf(stdout,"ADBUS has %d mA drive%s%s\n",
3889 (eeprom->group1_drive+1) *4,
3890 (eeprom->group1_schmitt)?" Schmitt Input":"",
3891 (eeprom->group1_slew)?" Slow Slew":"");
3892 for (i=0; i<10; i++)
3894 if (eeprom->cbus_function[i]<= CBUSH_CLK7_5 )
3895 fprintf(stdout,"C%d Function: %s\n", i,
3896 cbush_mux[eeprom->cbus_function[i]]);
3899 else if (ftdi->type == TYPE_230X)
3901 const char *cbusx_mux[] = {"TRISTATE","TXLED","RXLED", "TXRXLED","PWREN",
3902 "SLEEP","DRIVE_0","DRIVE_1","IOMODE","TXDEN",
3903 "CLK24","CLK12","CLK6","BAT_DETECT","BAT_DETECT#",
3904 "I2C_TXE#", "I2C_RXF#", "VBUS_SENSE", "BB_WR#",
3905 "BBRD#", "TIME_STAMP", "AWAKE#",
3907 fprintf(stdout,"DBUS has %d mA drive%s%s\n",
3908 (eeprom->group0_drive+1) *4,
3909 (eeprom->group0_schmitt)?" Schmitt Input":"",
3910 (eeprom->group0_slew)?" Slow Slew":"");
3911 fprintf(stdout,"CBUS has %d mA drive%s%s\n",
3912 (eeprom->group1_drive+1) *4,
3913 (eeprom->group1_schmitt)?" Schmitt Input":"",
3914 (eeprom->group1_slew)?" Slow Slew":"");
3917 if (eeprom->cbus_function[i]<= CBUSX_AWAKE)
3918 fprintf(stdout,"CBUS%d Function: %s\n", i, cbusx_mux[eeprom->cbus_function[i]]);
3922 print_inverted_bits(eeprom->invert);
3925 if (ftdi->type == TYPE_R)
3927 const char *cbus_mux[] = {"TXDEN","PWREN","RXLED", "TXLED","TX+RXLED",
3928 "SLEEP","CLK48","CLK24","CLK12","CLK6",
3929 "IOMODE","BB_WR","BB_RD"
3931 const char *cbus_BB[] = {"RXF","TXE","RD", "WR"};
3934 print_inverted_bits(eeprom->invert);
3938 if (eeprom->cbus_function[i]<=CBUS_BB_RD)
3939 fprintf(stdout,"C%d Function: %s\n", i,
3940 cbus_mux[eeprom->cbus_function[i]]);
3944 /* Running MPROG show that C0..3 have fixed function Synchronous
3946 fprintf(stdout,"C%d BB Function: %s\n", i,
3949 fprintf(stdout, "Unknown CBUS mode. Might be special mode?\n");
3958 Get a value from the decoded EEPROM structure
3960 \param ftdi pointer to ftdi_context
3961 \param value_name Enum of the value to query
3962 \param value Pointer to store read value
3965 \retval -1: Value doesn't exist
3967 int ftdi_get_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int* value)
3972 *value = ftdi->eeprom->vendor_id;
3975 *value = ftdi->eeprom->product_id;
3977 case RELEASE_NUMBER:
3978 *value = ftdi->eeprom->release_number;
3981 *value = ftdi->eeprom->self_powered;
3984 *value = ftdi->eeprom->remote_wakeup;
3987 *value = ftdi->eeprom->is_not_pnp;
3990 *value = ftdi->eeprom->suspend_dbus7;
3992 case IN_IS_ISOCHRONOUS:
3993 *value = ftdi->eeprom->in_is_isochronous;
3995 case OUT_IS_ISOCHRONOUS:
3996 *value = ftdi->eeprom->out_is_isochronous;
3998 case SUSPEND_PULL_DOWNS:
3999 *value = ftdi->eeprom->suspend_pull_downs;
4002 *value = ftdi->eeprom->use_serial;
4005 *value = ftdi->eeprom->usb_version;
4007 case USE_USB_VERSION:
4008 *value = ftdi->eeprom->use_usb_version;
4011 *value = ftdi->eeprom->max_power;
4013 case CHANNEL_A_TYPE:
4014 *value = ftdi->eeprom->channel_a_type;
4016 case CHANNEL_B_TYPE:
4017 *value = ftdi->eeprom->channel_b_type;
4019 case CHANNEL_A_DRIVER:
4020 *value = ftdi->eeprom->channel_a_driver;
4022 case CHANNEL_B_DRIVER:
4023 *value = ftdi->eeprom->channel_b_driver;
4025 case CHANNEL_C_DRIVER:
4026 *value = ftdi->eeprom->channel_c_driver;
4028 case CHANNEL_D_DRIVER:
4029 *value = ftdi->eeprom->channel_d_driver;
4031 case CHANNEL_A_RS485:
4032 *value = ftdi->eeprom->channel_a_rs485enable;
4034 case CHANNEL_B_RS485:
4035 *value = ftdi->eeprom->channel_b_rs485enable;
4037 case CHANNEL_C_RS485:
4038 *value = ftdi->eeprom->channel_c_rs485enable;
4040 case CHANNEL_D_RS485:
4041 *value = ftdi->eeprom->channel_d_rs485enable;
4043 case CBUS_FUNCTION_0:
4044 *value = ftdi->eeprom->cbus_function[0];
4046 case CBUS_FUNCTION_1:
4047 *value = ftdi->eeprom->cbus_function[1];
4049 case CBUS_FUNCTION_2:
4050 *value = ftdi->eeprom->cbus_function[2];
4052 case CBUS_FUNCTION_3:
4053 *value = ftdi->eeprom->cbus_function[3];
4055 case CBUS_FUNCTION_4:
4056 *value = ftdi->eeprom->cbus_function[4];
4058 case CBUS_FUNCTION_5:
4059 *value = ftdi->eeprom->cbus_function[5];
4061 case CBUS_FUNCTION_6:
4062 *value = ftdi->eeprom->cbus_function[6];
4064 case CBUS_FUNCTION_7:
4065 *value = ftdi->eeprom->cbus_function[7];
4067 case CBUS_FUNCTION_8:
4068 *value = ftdi->eeprom->cbus_function[8];
4070 case CBUS_FUNCTION_9:
4071 *value = ftdi->eeprom->cbus_function[9];
4074 *value = ftdi->eeprom->high_current;
4076 case HIGH_CURRENT_A:
4077 *value = ftdi->eeprom->high_current_a;
4079 case HIGH_CURRENT_B:
4080 *value = ftdi->eeprom->high_current_b;
4083 *value = ftdi->eeprom->invert;
4086 *value = ftdi->eeprom->group0_drive;
4088 case GROUP0_SCHMITT:
4089 *value = ftdi->eeprom->group0_schmitt;
4092 *value = ftdi->eeprom->group0_slew;
4095 *value = ftdi->eeprom->group1_drive;
4097 case GROUP1_SCHMITT:
4098 *value = ftdi->eeprom->group1_schmitt;
4101 *value = ftdi->eeprom->group1_slew;
4104 *value = ftdi->eeprom->group2_drive;
4106 case GROUP2_SCHMITT:
4107 *value = ftdi->eeprom->group2_schmitt;
4110 *value = ftdi->eeprom->group2_slew;
4113 *value = ftdi->eeprom->group3_drive;
4115 case GROUP3_SCHMITT:
4116 *value = ftdi->eeprom->group3_schmitt;
4119 *value = ftdi->eeprom->group3_slew;
4122 *value = ftdi->eeprom->powersave;
4124 case CLOCK_POLARITY:
4125 *value = ftdi->eeprom->clock_polarity;
4128 *value = ftdi->eeprom->data_order;
4131 *value = ftdi->eeprom->flow_control;
4134 *value = ftdi->eeprom->chip;
4137 *value = ftdi->eeprom->size;
4139 case EXTERNAL_OSCILLATOR:
4140 *value = ftdi->eeprom->external_oscillator;
4143 ftdi_error_return(-1, "Request for unknown EEPROM value");
4149 Set a value in the decoded EEPROM Structure
4150 No parameter checking is performed
4152 \param ftdi pointer to ftdi_context
4153 \param value_name Enum of the value to set
4157 \retval -1: Value doesn't exist
4158 \retval -2: Value not user settable
4160 int ftdi_set_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int value)
4165 ftdi->eeprom->vendor_id = value;
4168 ftdi->eeprom->product_id = value;
4170 case RELEASE_NUMBER:
4171 ftdi->eeprom->release_number = value;
4174 ftdi->eeprom->self_powered = value;
4177 ftdi->eeprom->remote_wakeup = value;
4180 ftdi->eeprom->is_not_pnp = value;
4183 ftdi->eeprom->suspend_dbus7 = value;
4185 case IN_IS_ISOCHRONOUS:
4186 ftdi->eeprom->in_is_isochronous = value;
4188 case OUT_IS_ISOCHRONOUS:
4189 ftdi->eeprom->out_is_isochronous = value;
4191 case SUSPEND_PULL_DOWNS:
4192 ftdi->eeprom->suspend_pull_downs = value;
4195 ftdi->eeprom->use_serial = value;
4198 ftdi->eeprom->usb_version = value;
4200 case USE_USB_VERSION:
4201 ftdi->eeprom->use_usb_version = value;
4204 ftdi->eeprom->max_power = value;
4206 case CHANNEL_A_TYPE:
4207 ftdi->eeprom->channel_a_type = value;
4209 case CHANNEL_B_TYPE:
4210 ftdi->eeprom->channel_b_type = value;
4212 case CHANNEL_A_DRIVER:
4213 ftdi->eeprom->channel_a_driver = value;
4215 case CHANNEL_B_DRIVER:
4216 ftdi->eeprom->channel_b_driver = value;
4218 case CHANNEL_C_DRIVER:
4219 ftdi->eeprom->channel_c_driver = value;
4221 case CHANNEL_D_DRIVER:
4222 ftdi->eeprom->channel_d_driver = value;
4224 case CHANNEL_A_RS485:
4225 ftdi->eeprom->channel_a_rs485enable = value;
4227 case CHANNEL_B_RS485:
4228 ftdi->eeprom->channel_b_rs485enable = value;
4230 case CHANNEL_C_RS485:
4231 ftdi->eeprom->channel_c_rs485enable = value;
4233 case CHANNEL_D_RS485:
4234 ftdi->eeprom->channel_d_rs485enable = value;
4236 case CBUS_FUNCTION_0:
4237 ftdi->eeprom->cbus_function[0] = value;
4239 case CBUS_FUNCTION_1:
4240 ftdi->eeprom->cbus_function[1] = value;
4242 case CBUS_FUNCTION_2:
4243 ftdi->eeprom->cbus_function[2] = value;
4245 case CBUS_FUNCTION_3:
4246 ftdi->eeprom->cbus_function[3] = value;
4248 case CBUS_FUNCTION_4:
4249 ftdi->eeprom->cbus_function[4] = value;
4251 case CBUS_FUNCTION_5:
4252 ftdi->eeprom->cbus_function[5] = value;
4254 case CBUS_FUNCTION_6:
4255 ftdi->eeprom->cbus_function[6] = value;
4257 case CBUS_FUNCTION_7:
4258 ftdi->eeprom->cbus_function[7] = value;
4260 case CBUS_FUNCTION_8:
4261 ftdi->eeprom->cbus_function[8] = value;
4263 case CBUS_FUNCTION_9:
4264 ftdi->eeprom->cbus_function[9] = value;
4267 ftdi->eeprom->high_current = value;
4269 case HIGH_CURRENT_A:
4270 ftdi->eeprom->high_current_a = value;
4272 case HIGH_CURRENT_B:
4273 ftdi->eeprom->high_current_b = value;
4276 ftdi->eeprom->invert = value;
4279 ftdi->eeprom->group0_drive = value;
4281 case GROUP0_SCHMITT:
4282 ftdi->eeprom->group0_schmitt = value;
4285 ftdi->eeprom->group0_slew = value;
4288 ftdi->eeprom->group1_drive = value;
4290 case GROUP1_SCHMITT:
4291 ftdi->eeprom->group1_schmitt = value;
4294 ftdi->eeprom->group1_slew = value;
4297 ftdi->eeprom->group2_drive = value;
4299 case GROUP2_SCHMITT:
4300 ftdi->eeprom->group2_schmitt = value;
4303 ftdi->eeprom->group2_slew = value;
4306 ftdi->eeprom->group3_drive = value;
4308 case GROUP3_SCHMITT:
4309 ftdi->eeprom->group3_schmitt = value;
4312 ftdi->eeprom->group3_slew = value;
4315 ftdi->eeprom->chip = value;
4318 ftdi->eeprom->powersave = value;
4320 case CLOCK_POLARITY:
4321 ftdi->eeprom->clock_polarity = value;
4324 ftdi->eeprom->data_order = value;
4327 ftdi->eeprom->flow_control = value;
4330 ftdi_error_return(-2, "EEPROM Value can't be changed");
4332 case EXTERNAL_OSCILLATOR:
4333 ftdi->eeprom->external_oscillator = value;
4335 case USER_DATA_ADDR:
4336 ftdi->eeprom->user_data_addr = value;
4340 ftdi_error_return(-1, "Request to unknown EEPROM value");
4342 ftdi->eeprom->initialized_for_connected_device = 0;
4346 /** Get the read-only buffer to the binary EEPROM content
4348 \param ftdi pointer to ftdi_context
4349 \param buf buffer to receive EEPROM content
4350 \param size Size of receiving buffer
4353 \retval -1: struct ftdi_contxt or ftdi_eeprom missing
4354 \retval -2: Not enough room to store eeprom
4356 int ftdi_get_eeprom_buf(struct ftdi_context *ftdi, unsigned char * buf, int size)
4358 if (!ftdi || !(ftdi->eeprom))
4359 ftdi_error_return(-1, "No appropriate structure");
4361 if (!buf || size < ftdi->eeprom->size)
4362 ftdi_error_return(-1, "Not enough room to store eeprom");
4364 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
4365 if (size > FTDI_MAX_EEPROM_SIZE)
4366 size = FTDI_MAX_EEPROM_SIZE;
4368 memcpy(buf, ftdi->eeprom->buf, size);
4373 /** Set the EEPROM content from the user-supplied prefilled buffer
4375 \param ftdi pointer to ftdi_context
4376 \param buf buffer to read EEPROM content
4377 \param size Size of buffer
4380 \retval -1: struct ftdi_context or ftdi_eeprom or buf missing
4382 int ftdi_set_eeprom_buf(struct ftdi_context *ftdi, const unsigned char * buf, int size)
4384 if (!ftdi || !(ftdi->eeprom) || !buf)
4385 ftdi_error_return(-1, "No appropriate structure");
4387 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
4388 if (size > FTDI_MAX_EEPROM_SIZE)
4389 size = FTDI_MAX_EEPROM_SIZE;
4391 memcpy(ftdi->eeprom->buf, buf, size);
4396 /** Set the EEPROM user data content from the user-supplied prefilled buffer
4398 \param ftdi pointer to ftdi_context
4399 \param buf buffer to read EEPROM user data content
4400 \param size Size of buffer
4403 \retval -1: struct ftdi_context or ftdi_eeprom or buf missing
4405 int ftdi_set_eeprom_user_data(struct ftdi_context *ftdi, const char * buf, int size)
4407 if (!ftdi || !(ftdi->eeprom) || !buf)
4408 ftdi_error_return(-1, "No appropriate structure");
4410 ftdi->eeprom->user_data_size = size;
4411 ftdi->eeprom->user_data = buf;
4416 Read eeprom location
4418 \param ftdi pointer to ftdi_context
4419 \param eeprom_addr Address of eeprom location to be read
4420 \param eeprom_val Pointer to store read eeprom location
4423 \retval -1: read failed
4424 \retval -2: USB device unavailable
4426 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
4428 unsigned char buf[2];
4430 if (ftdi == NULL || ftdi->usb_dev == NULL)
4431 ftdi_error_return(-2, "USB device unavailable");
4433 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, eeprom_addr, buf, 2, ftdi->usb_read_timeout) != 2)
4434 ftdi_error_return(-1, "reading eeprom failed");
4436 *eeprom_val = (0xff & buf[0]) | (buf[1] << 8);
4444 \param ftdi pointer to ftdi_context
4447 \retval -1: read failed
4448 \retval -2: USB device unavailable
4450 int ftdi_read_eeprom(struct ftdi_context *ftdi)
4455 if (ftdi == NULL || ftdi->usb_dev == NULL)
4456 ftdi_error_return(-2, "USB device unavailable");
4457 buf = ftdi->eeprom->buf;
4459 for (i = 0; i < FTDI_MAX_EEPROM_SIZE/2; i++)
4461 if (libusb_control_transfer(
4462 ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,SIO_READ_EEPROM_REQUEST, 0, i,
4463 buf+(i*2), 2, ftdi->usb_read_timeout) != 2)
4464 ftdi_error_return(-1, "reading eeprom failed");
4467 if (ftdi->type == TYPE_R)
4468 ftdi->eeprom->size = 0x80;
4469 /* Guesses size of eeprom by comparing halves
4470 - will not work with blank eeprom */
4471 else if (strrchr((const char *)buf, 0xff) == ((const char *)buf +FTDI_MAX_EEPROM_SIZE -1))
4472 ftdi->eeprom->size = -1;
4473 else if (memcmp(buf,&buf[0x80],0x80) == 0)
4474 ftdi->eeprom->size = 0x80;
4475 else if (memcmp(buf,&buf[0x40],0x40) == 0)
4476 ftdi->eeprom->size = 0x40;
4478 ftdi->eeprom->size = 0x100;
4483 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
4484 Function is only used internally
4487 static unsigned char ftdi_read_chipid_shift(unsigned char value)
4489 return ((value & 1) << 1) |
4490 ((value & 2) << 5) |
4491 ((value & 4) >> 2) |
4492 ((value & 8) << 4) |
4493 ((value & 16) >> 1) |
4494 ((value & 32) >> 1) |
4495 ((value & 64) >> 4) |
4496 ((value & 128) >> 2);
4500 Read the FTDIChip-ID from R-type devices
4502 \param ftdi pointer to ftdi_context
4503 \param chipid Pointer to store FTDIChip-ID
4506 \retval -1: read failed
4507 \retval -2: USB device unavailable
4509 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
4511 unsigned int a = 0, b = 0;
4513 if (ftdi == NULL || ftdi->usb_dev == NULL)
4514 ftdi_error_return(-2, "USB device unavailable");
4516 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, 0x43, (unsigned char *)&a, 2, ftdi->usb_read_timeout) == 2)
4518 a = a << 8 | a >> 8;
4519 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, 0x44, (unsigned char *)&b, 2, ftdi->usb_read_timeout) == 2)
4521 b = b << 8 | b >> 8;
4522 a = (a << 16) | (b & 0xFFFF);
4523 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
4524 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
4525 *chipid = a ^ 0xa5f0f7d1;
4530 ftdi_error_return(-1, "read of FTDIChip-ID failed");
4534 Write eeprom location
4536 \param ftdi pointer to ftdi_context
4537 \param eeprom_addr Address of eeprom location to be written
4538 \param eeprom_val Value to be written
4541 \retval -1: write failed
4542 \retval -2: USB device unavailable
4543 \retval -3: Invalid access to checksum protected area below 0x80
4544 \retval -4: Device can't access unprotected area
4545 \retval -5: Reading chip type failed
4547 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr,
4548 unsigned short eeprom_val)
4550 int chip_type_location;
4551 unsigned short chip_type;
4553 if (ftdi == NULL || ftdi->usb_dev == NULL)
4554 ftdi_error_return(-2, "USB device unavailable");
4556 if (eeprom_addr <0x80)
4557 ftdi_error_return(-2, "Invalid access to checksum protected area below 0x80");
4564 chip_type_location = 0x14;
4568 chip_type_location = 0x18;
4571 chip_type_location = 0x1e;
4574 ftdi_error_return(-4, "Device can't access unprotected area");
4577 if (ftdi_read_eeprom_location( ftdi, chip_type_location>>1, &chip_type))
4578 ftdi_error_return(-5, "Reading failed");
4579 fprintf(stderr," loc 0x%04x val 0x%04x\n", chip_type_location,chip_type);
4580 if ((chip_type & 0xff) != 0x66)
4582 ftdi_error_return(-6, "EEPROM is not of 93x66");
4585 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
4586 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
4587 NULL, 0, ftdi->usb_write_timeout) != 0)
4588 ftdi_error_return(-1, "unable to write eeprom");
4596 \param ftdi pointer to ftdi_context
4599 \retval -1: read failed
4600 \retval -2: USB device unavailable
4601 \retval -3: EEPROM not initialized for the connected device;
4603 int ftdi_write_eeprom(struct ftdi_context *ftdi)
4605 unsigned short usb_val, status;
4607 unsigned char *eeprom;
4609 if (ftdi == NULL || ftdi->usb_dev == NULL)
4610 ftdi_error_return(-2, "USB device unavailable");
4612 if(ftdi->eeprom->initialized_for_connected_device == 0)
4613 ftdi_error_return(-3, "EEPROM not initialized for the connected device");
4615 eeprom = ftdi->eeprom->buf;
4617 /* These commands were traced while running MProg */
4618 if ((ret = ftdi_usb_reset(ftdi)) != 0)
4620 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
4622 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
4625 for (i = 0; i < ftdi->eeprom->size/2; i++)
4627 /* Do not try to write to reserved area */
4628 if ((ftdi->type == TYPE_230X) && (i == 0x40))
4632 usb_val = eeprom[i*2];
4633 usb_val += eeprom[(i*2)+1] << 8;
4634 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
4635 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
4636 NULL, 0, ftdi->usb_write_timeout) < 0)
4637 ftdi_error_return(-1, "unable to write eeprom");
4646 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
4648 \param ftdi pointer to ftdi_context
4651 \retval -1: erase failed
4652 \retval -2: USB device unavailable
4653 \retval -3: Writing magic failed
4654 \retval -4: Read EEPROM failed
4655 \retval -5: Unexpected EEPROM value
4657 #define MAGIC 0x55aa
4658 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
4660 unsigned short eeprom_value;
4661 if (ftdi == NULL || ftdi->usb_dev == NULL)
4662 ftdi_error_return(-2, "USB device unavailable");
4664 if ((ftdi->type == TYPE_R) || (ftdi->type == TYPE_230X))
4666 ftdi->eeprom->chip = 0;
4670 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
4671 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
4672 ftdi_error_return(-1, "unable to erase eeprom");
4675 /* detect chip type by writing 0x55AA as magic at word position 0xc0
4676 Chip is 93x46 if magic is read at word position 0x00, as wraparound happens around 0x40
4677 Chip is 93x56 if magic is read at word position 0x40, as wraparound happens around 0x80
4678 Chip is 93x66 if magic is only read at word position 0xc0*/
4679 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
4680 SIO_WRITE_EEPROM_REQUEST, MAGIC, 0xc0,
4681 NULL, 0, ftdi->usb_write_timeout) != 0)
4682 ftdi_error_return(-3, "Writing magic failed");
4683 if (ftdi_read_eeprom_location( ftdi, 0x00, &eeprom_value))
4684 ftdi_error_return(-4, "Reading failed");
4685 if (eeprom_value == MAGIC)
4687 ftdi->eeprom->chip = 0x46;
4691 if (ftdi_read_eeprom_location( ftdi, 0x40, &eeprom_value))
4692 ftdi_error_return(-4, "Reading failed");
4693 if (eeprom_value == MAGIC)
4694 ftdi->eeprom->chip = 0x56;
4697 if (ftdi_read_eeprom_location( ftdi, 0xc0, &eeprom_value))
4698 ftdi_error_return(-4, "Reading failed");
4699 if (eeprom_value == MAGIC)
4700 ftdi->eeprom->chip = 0x66;
4703 ftdi->eeprom->chip = -1;
4707 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
4708 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
4709 ftdi_error_return(-1, "unable to erase eeprom");
4714 Get string representation for last error code
4716 \param ftdi pointer to ftdi_context
4718 \retval Pointer to error string
4720 const char *ftdi_get_error_string (struct ftdi_context *ftdi)
4725 return ftdi->error_str;
4728 /* @} end of doxygen libftdi group */