1 /***************************************************************************
5 copyright : (C) 2003-2011 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 http://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 */
39 #include "ftdi_version_i.h"
41 #define ftdi_error_return(code, str) do { \
42 ftdi->error_str = str; \
46 #define ftdi_error_return_free_device_list(code, str, devs) do { \
47 libusb_free_device_list(devs,1); \
48 ftdi->error_str = str; \
54 Internal function to close usb device pointer.
55 Sets ftdi->usb_dev to NULL.
58 \param ftdi pointer to ftdi_context
62 static void ftdi_usb_close_internal (struct ftdi_context *ftdi)
64 if (ftdi && ftdi->usb_dev)
66 libusb_close (ftdi->usb_dev);
69 ftdi->eeprom->initialized_for_connected_device = 0;
74 Initializes a ftdi_context.
76 \param ftdi pointer to ftdi_context
79 \retval -1: couldn't allocate read buffer
80 \retval -2: couldn't allocate struct buffer
81 \retval -3: libusb_init() failed
83 \remark This should be called before all functions
85 int ftdi_init(struct ftdi_context *ftdi)
87 struct ftdi_eeprom* eeprom = (struct ftdi_eeprom *)malloc(sizeof(struct ftdi_eeprom));
90 ftdi->usb_read_timeout = 5000;
91 ftdi->usb_write_timeout = 5000;
93 ftdi->type = TYPE_BM; /* chip type */
95 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
97 ftdi->readbuffer = NULL;
98 ftdi->readbuffer_offset = 0;
99 ftdi->readbuffer_remaining = 0;
100 ftdi->writebuffer_chunksize = 4096;
101 ftdi->max_packet_size = 0;
102 ftdi->error_str = NULL;
103 ftdi->module_detach_mode = AUTO_DETACH_SIO_MODULE;
105 if (libusb_init(&ftdi->usb_ctx) < 0)
106 ftdi_error_return(-3, "libusb_init() failed");
108 ftdi_set_interface(ftdi, INTERFACE_ANY);
109 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
112 ftdi_error_return(-2, "Can't malloc struct ftdi_eeprom");
113 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
114 ftdi->eeprom = eeprom;
116 /* All fine. Now allocate the readbuffer */
117 return ftdi_read_data_set_chunksize(ftdi, 4096);
121 Allocate and initialize a new ftdi_context
123 \return a pointer to a new ftdi_context, or NULL on failure
125 struct ftdi_context *ftdi_new(void)
127 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
134 if (ftdi_init(ftdi) != 0)
144 Open selected channels on a chip, otherwise use first channel.
146 \param ftdi pointer to ftdi_context
147 \param interface Interface to use for FT2232C/2232H/4232H chips.
150 \retval -1: unknown interface
151 \retval -2: USB device unavailable
153 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
156 ftdi_error_return(-2, "USB device unavailable");
163 ftdi->index = INTERFACE_A;
169 ftdi->index = INTERFACE_B;
175 ftdi->index = INTERFACE_C;
181 ftdi->index = INTERFACE_D;
186 ftdi_error_return(-1, "Unknown interface");
192 Deinitializes a ftdi_context.
194 \param ftdi pointer to ftdi_context
196 void ftdi_deinit(struct ftdi_context *ftdi)
201 ftdi_usb_close_internal (ftdi);
203 if (ftdi->readbuffer != NULL)
205 free(ftdi->readbuffer);
206 ftdi->readbuffer = NULL;
209 if (ftdi->eeprom != NULL)
211 if (ftdi->eeprom->manufacturer != 0)
213 free(ftdi->eeprom->manufacturer);
214 ftdi->eeprom->manufacturer = 0;
216 if (ftdi->eeprom->product != 0)
218 free(ftdi->eeprom->product);
219 ftdi->eeprom->product = 0;
221 if (ftdi->eeprom->serial != 0)
223 free(ftdi->eeprom->serial);
224 ftdi->eeprom->serial = 0;
232 libusb_exit(ftdi->usb_ctx);
233 ftdi->usb_ctx = NULL;
238 Deinitialize and free an ftdi_context.
240 \param ftdi pointer to ftdi_context
242 void ftdi_free(struct ftdi_context *ftdi)
249 Use an already open libusb device.
251 \param ftdi pointer to ftdi_context
252 \param usb libusb libusb_device_handle to use
254 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
263 * @brief Get libftdi library version
265 * @return ftdi_version_info Library version information
267 struct ftdi_version_info ftdi_get_library_version()
269 struct ftdi_version_info ver;
271 ver.major = FTDI_MAJOR_VERSION;
272 ver.minor = FTDI_MINOR_VERSION;
273 ver.micro = FTDI_MICRO_VERSION;
274 ver.version_str = FTDI_VERSION_STRING;
275 ver.snapshot_str = FTDI_SNAPSHOT_VERSION;
281 Finds all ftdi devices with given VID:PID on the usb bus. Creates a new
282 ftdi_device_list which needs to be deallocated by ftdi_list_free() after
283 use. With VID:PID 0:0, search for the default devices
284 (0x403:0x6001, 0x403:0x6010, 0x403:0x6011, 0x403:0x6014)
286 \param ftdi pointer to ftdi_context
287 \param devlist Pointer where to store list of found devices
288 \param vendor Vendor ID to search for
289 \param product Product ID to search for
291 \retval >0: number of devices found
292 \retval -3: out of memory
293 \retval -5: libusb_get_device_list() failed
294 \retval -6: libusb_get_device_descriptor() failed
296 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
298 struct ftdi_device_list **curdev;
300 libusb_device **devs;
304 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
305 ftdi_error_return(-5, "libusb_get_device_list() failed");
310 while ((dev = devs[i++]) != NULL)
312 struct libusb_device_descriptor desc;
314 if (libusb_get_device_descriptor(dev, &desc) < 0)
315 ftdi_error_return_free_device_list(-6, "libusb_get_device_descriptor() failed", devs);
317 if (((vendor != 0 && product != 0) &&
318 desc.idVendor == vendor && desc.idProduct == product) ||
319 ((vendor == 0 && product == 0) &&
320 (desc.idVendor == 0x403) && (desc.idProduct == 0x6001 || desc.idProduct == 0x6010
321 || desc.idProduct == 0x6011 || desc.idProduct == 0x6014)))
323 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
325 ftdi_error_return_free_device_list(-3, "out of memory", devs);
327 (*curdev)->next = NULL;
328 (*curdev)->dev = dev;
329 libusb_ref_device(dev);
330 curdev = &(*curdev)->next;
334 libusb_free_device_list(devs,1);
339 Frees a usb device list.
341 \param devlist USB device list created by ftdi_usb_find_all()
343 void ftdi_list_free(struct ftdi_device_list **devlist)
345 struct ftdi_device_list *curdev, *next;
347 for (curdev = *devlist; curdev != NULL;)
350 libusb_unref_device(curdev->dev);
359 Frees a usb device list.
361 \param devlist USB device list created by ftdi_usb_find_all()
363 void ftdi_list_free2(struct ftdi_device_list *devlist)
365 ftdi_list_free(&devlist);
369 Return device ID strings from the usb device.
371 The parameters manufacturer, description and serial may be NULL
372 or pointer to buffers to store the fetched strings.
374 \note Use this function only in combination with ftdi_usb_find_all()
375 as it closes the internal "usb_dev" after use.
377 \param ftdi pointer to ftdi_context
378 \param dev libusb usb_dev to use
379 \param manufacturer Store manufacturer string here if not NULL
380 \param mnf_len Buffer size of manufacturer string
381 \param description Store product description string here if not NULL
382 \param desc_len Buffer size of product description string
383 \param serial Store serial string here if not NULL
384 \param serial_len Buffer size of serial string
387 \retval -1: wrong arguments
388 \retval -4: unable to open device
389 \retval -7: get product manufacturer failed
390 \retval -8: get product description failed
391 \retval -9: get serial number failed
392 \retval -11: libusb_get_device_descriptor() failed
394 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
395 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
397 struct libusb_device_descriptor desc;
399 if ((ftdi==NULL) || (dev==NULL))
402 if (libusb_open(dev, &ftdi->usb_dev) < 0)
403 ftdi_error_return(-4, "libusb_open() failed");
405 if (libusb_get_device_descriptor(dev, &desc) < 0)
406 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
408 if (manufacturer != NULL)
410 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
412 ftdi_usb_close_internal (ftdi);
413 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
417 if (description != NULL)
419 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
421 ftdi_usb_close_internal (ftdi);
422 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
428 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
430 ftdi_usb_close_internal (ftdi);
431 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
435 ftdi_usb_close_internal (ftdi);
441 * Internal function to determine the maximum packet size.
442 * \param ftdi pointer to ftdi_context
443 * \param dev libusb usb_dev to use
444 * \retval Maximum packet size for this device
446 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
448 struct libusb_device_descriptor desc;
449 struct libusb_config_descriptor *config0;
450 unsigned int packet_size;
453 if (ftdi == NULL || dev == NULL)
456 // Determine maximum packet size. Init with default value.
457 // New hi-speed devices from FTDI use a packet size of 512 bytes
458 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
459 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H )
464 if (libusb_get_device_descriptor(dev, &desc) < 0)
467 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
470 if (desc.bNumConfigurations > 0)
472 if (ftdi->interface < config0->bNumInterfaces)
474 struct libusb_interface interface = config0->interface[ftdi->interface];
475 if (interface.num_altsetting > 0)
477 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
478 if (descriptor.bNumEndpoints > 0)
480 packet_size = descriptor.endpoint[0].wMaxPacketSize;
486 libusb_free_config_descriptor (config0);
491 Opens a ftdi device given by an usb_device.
493 \param ftdi pointer to ftdi_context
494 \param dev libusb usb_dev to use
497 \retval -3: unable to config device
498 \retval -4: unable to open device
499 \retval -5: unable to claim device
500 \retval -6: reset failed
501 \retval -7: set baudrate failed
502 \retval -8: ftdi context invalid
503 \retval -9: libusb_get_device_descriptor() failed
504 \retval -10: libusb_get_config_descriptor() failed
505 \retval -11: libusb_detach_kernel_driver() failed
506 \retval -12: libusb_get_configuration() failed
508 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
510 struct libusb_device_descriptor desc;
511 struct libusb_config_descriptor *config0;
512 int cfg, cfg0, detach_errno = 0;
515 ftdi_error_return(-8, "ftdi context invalid");
517 if (libusb_open(dev, &ftdi->usb_dev) < 0)
518 ftdi_error_return(-4, "libusb_open() failed");
520 if (libusb_get_device_descriptor(dev, &desc) < 0)
521 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
523 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
524 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
525 cfg0 = config0->bConfigurationValue;
526 libusb_free_config_descriptor (config0);
528 // Try to detach ftdi_sio kernel module.
530 // The return code is kept in a separate variable and only parsed
531 // if usb_set_configuration() or usb_claim_interface() fails as the
532 // detach operation might be denied and everything still works fine.
533 // Likely scenario is a static ftdi_sio kernel module.
534 if (ftdi->module_detach_mode == AUTO_DETACH_SIO_MODULE)
536 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
537 detach_errno = errno;
540 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
541 ftdi_error_return(-12, "libusb_get_configuration () failed");
542 // set configuration (needed especially for windows)
543 // tolerate EBUSY: one device with one configuration, but two interfaces
544 // and libftdi sessions to both interfaces (e.g. FT2232)
545 if (desc.bNumConfigurations > 0 && cfg != cfg0)
547 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
549 ftdi_usb_close_internal (ftdi);
550 if (detach_errno == EPERM)
552 ftdi_error_return(-8, "inappropriate permissions on device!");
556 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
561 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
563 ftdi_usb_close_internal (ftdi);
564 if (detach_errno == EPERM)
566 ftdi_error_return(-8, "inappropriate permissions on device!");
570 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
574 if (ftdi_usb_reset (ftdi) != 0)
576 ftdi_usb_close_internal (ftdi);
577 ftdi_error_return(-6, "ftdi_usb_reset failed");
580 // Try to guess chip type
581 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
582 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
583 && desc.iSerialNumber == 0))
584 ftdi->type = TYPE_BM;
585 else if (desc.bcdDevice == 0x200)
586 ftdi->type = TYPE_AM;
587 else if (desc.bcdDevice == 0x500)
588 ftdi->type = TYPE_2232C;
589 else if (desc.bcdDevice == 0x600)
591 else if (desc.bcdDevice == 0x700)
592 ftdi->type = TYPE_2232H;
593 else if (desc.bcdDevice == 0x800)
594 ftdi->type = TYPE_4232H;
595 else if (desc.bcdDevice == 0x900)
596 ftdi->type = TYPE_232H;
598 // Determine maximum packet size
599 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
601 if (ftdi_set_baudrate (ftdi, 9600) != 0)
603 ftdi_usb_close_internal (ftdi);
604 ftdi_error_return(-7, "set baudrate failed");
607 ftdi_error_return(0, "all fine");
611 Opens the first device with a given vendor and product ids.
613 \param ftdi pointer to ftdi_context
614 \param vendor Vendor ID
615 \param product Product ID
617 \retval same as ftdi_usb_open_desc()
619 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
621 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
625 Opens the first device with a given, vendor id, product id,
626 description and serial.
628 \param ftdi pointer to ftdi_context
629 \param vendor Vendor ID
630 \param product Product ID
631 \param description Description to search for. Use NULL if not needed.
632 \param serial Serial to search for. Use NULL if not needed.
635 \retval -3: usb device not found
636 \retval -4: unable to open device
637 \retval -5: unable to claim device
638 \retval -6: reset failed
639 \retval -7: set baudrate failed
640 \retval -8: get product description failed
641 \retval -9: get serial number failed
642 \retval -12: libusb_get_device_list() failed
643 \retval -13: libusb_get_device_descriptor() failed
645 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
646 const char* description, const char* serial)
648 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
652 Opens the index-th device with a given, vendor id, product id,
653 description and serial.
655 \param ftdi pointer to ftdi_context
656 \param vendor Vendor ID
657 \param product Product ID
658 \param description Description to search for. Use NULL if not needed.
659 \param serial Serial to search for. Use NULL if not needed.
660 \param index Number of matching device to open if there are more than one, starts with 0.
663 \retval -1: usb_find_busses() failed
664 \retval -2: usb_find_devices() failed
665 \retval -3: usb device not found
666 \retval -4: unable to open device
667 \retval -5: unable to claim device
668 \retval -6: reset failed
669 \retval -7: set baudrate failed
670 \retval -8: get product description failed
671 \retval -9: get serial number failed
672 \retval -10: unable to close device
673 \retval -11: ftdi context invalid
675 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
676 const char* description, const char* serial, unsigned int index)
679 libusb_device **devs;
684 ftdi_error_return(-11, "ftdi context invalid");
686 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
687 ftdi_error_return(-12, "libusb_get_device_list() failed");
689 while ((dev = devs[i++]) != NULL)
691 struct libusb_device_descriptor desc;
694 if (libusb_get_device_descriptor(dev, &desc) < 0)
695 ftdi_error_return_free_device_list(-13, "libusb_get_device_descriptor() failed", devs);
697 if (desc.idVendor == vendor && desc.idProduct == product)
699 if (libusb_open(dev, &ftdi->usb_dev) < 0)
700 ftdi_error_return_free_device_list(-4, "usb_open() failed", devs);
702 if (description != NULL)
704 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
706 ftdi_usb_close_internal (ftdi);
707 ftdi_error_return_free_device_list(-8, "unable to fetch product description", devs);
709 if (strncmp(string, description, sizeof(string)) != 0)
711 ftdi_usb_close_internal (ftdi);
717 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
719 ftdi_usb_close_internal (ftdi);
720 ftdi_error_return_free_device_list(-9, "unable to fetch serial number", devs);
722 if (strncmp(string, serial, sizeof(string)) != 0)
724 ftdi_usb_close_internal (ftdi);
729 ftdi_usb_close_internal (ftdi);
737 res = ftdi_usb_open_dev(ftdi, dev);
738 libusb_free_device_list(devs,1);
744 ftdi_error_return_free_device_list(-3, "device not found", devs);
748 Opens the ftdi-device described by a description-string.
749 Intended to be used for parsing a device-description given as commandline argument.
751 \param ftdi pointer to ftdi_context
752 \param description NULL-terminated description-string, using this format:
753 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
754 \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")
755 \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
756 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
758 \note The description format may be extended in later versions.
761 \retval -2: libusb_get_device_list() failed
762 \retval -3: usb device not found
763 \retval -4: unable to open device
764 \retval -5: unable to claim device
765 \retval -6: reset failed
766 \retval -7: set baudrate failed
767 \retval -8: get product description failed
768 \retval -9: get serial number failed
769 \retval -10: unable to close device
770 \retval -11: illegal description format
771 \retval -12: ftdi context invalid
773 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
776 ftdi_error_return(-12, "ftdi context invalid");
778 if (description[0] == 0 || description[1] != ':')
779 ftdi_error_return(-11, "illegal description format");
781 if (description[0] == 'd')
784 libusb_device **devs;
785 unsigned int bus_number, device_address;
788 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
789 ftdi_error_return(-2, "libusb_get_device_list() failed");
791 /* XXX: This doesn't handle symlinks/odd paths/etc... */
792 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
793 ftdi_error_return_free_device_list(-11, "illegal description format", devs);
795 while ((dev = devs[i++]) != NULL)
798 if (bus_number == libusb_get_bus_number (dev)
799 && device_address == libusb_get_device_address (dev))
801 ret = ftdi_usb_open_dev(ftdi, dev);
802 libusb_free_device_list(devs,1);
808 ftdi_error_return_free_device_list(-3, "device not found", devs);
810 else if (description[0] == 'i' || description[0] == 's')
813 unsigned int product;
814 unsigned int index=0;
815 const char *serial=NULL;
816 const char *startp, *endp;
819 startp=description+2;
820 vendor=strtoul((char*)startp,(char**)&endp,0);
821 if (*endp != ':' || endp == startp || errno != 0)
822 ftdi_error_return(-11, "illegal description format");
825 product=strtoul((char*)startp,(char**)&endp,0);
826 if (endp == startp || errno != 0)
827 ftdi_error_return(-11, "illegal description format");
829 if (description[0] == 'i' && *endp != 0)
831 /* optional index field in i-mode */
833 ftdi_error_return(-11, "illegal description format");
836 index=strtoul((char*)startp,(char**)&endp,0);
837 if (*endp != 0 || endp == startp || errno != 0)
838 ftdi_error_return(-11, "illegal description format");
840 if (description[0] == 's')
843 ftdi_error_return(-11, "illegal description format");
845 /* rest of the description is the serial */
849 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
853 ftdi_error_return(-11, "illegal description format");
858 Resets the ftdi device.
860 \param ftdi pointer to ftdi_context
863 \retval -1: FTDI reset failed
864 \retval -2: USB device unavailable
866 int ftdi_usb_reset(struct ftdi_context *ftdi)
868 if (ftdi == NULL || ftdi->usb_dev == NULL)
869 ftdi_error_return(-2, "USB device unavailable");
871 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
872 SIO_RESET_REQUEST, SIO_RESET_SIO,
873 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
874 ftdi_error_return(-1,"FTDI reset failed");
876 // Invalidate data in the readbuffer
877 ftdi->readbuffer_offset = 0;
878 ftdi->readbuffer_remaining = 0;
884 Clears the read buffer on the chip and the internal read buffer.
886 \param ftdi pointer to ftdi_context
889 \retval -1: read buffer purge failed
890 \retval -2: USB device unavailable
892 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
894 if (ftdi == NULL || ftdi->usb_dev == NULL)
895 ftdi_error_return(-2, "USB device unavailable");
897 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
898 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
899 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
900 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
902 // Invalidate data in the readbuffer
903 ftdi->readbuffer_offset = 0;
904 ftdi->readbuffer_remaining = 0;
910 Clears the write buffer on the chip.
912 \param ftdi pointer to ftdi_context
915 \retval -1: write buffer purge failed
916 \retval -2: USB device unavailable
918 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
920 if (ftdi == NULL || ftdi->usb_dev == NULL)
921 ftdi_error_return(-2, "USB device unavailable");
923 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
924 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
925 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
926 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
932 Clears the buffers on the chip and the internal read buffer.
934 \param ftdi pointer to ftdi_context
937 \retval -1: read buffer purge failed
938 \retval -2: write buffer purge failed
939 \retval -3: USB device unavailable
941 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
945 if (ftdi == NULL || ftdi->usb_dev == NULL)
946 ftdi_error_return(-3, "USB device unavailable");
948 result = ftdi_usb_purge_rx_buffer(ftdi);
952 result = ftdi_usb_purge_tx_buffer(ftdi);
962 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
964 \param ftdi pointer to ftdi_context
967 \retval -1: usb_release failed
968 \retval -3: ftdi context invalid
970 int ftdi_usb_close(struct ftdi_context *ftdi)
975 ftdi_error_return(-3, "ftdi context invalid");
977 if (ftdi->usb_dev != NULL)
978 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
981 ftdi_usb_close_internal (ftdi);
986 /* ftdi_to_clkbits_AM For the AM device, convert a requested baudrate
987 to encoded divisor and the achievable baudrate
988 Function is only used internally
995 From /2, 0.125/ 0.25 and 0.5 steps may be taken
996 The fractional part has frac_code encoding
998 static int ftdi_to_clkbits_AM(int baudrate, unsigned long *encoded_divisor)
1001 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1002 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
1003 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
1004 int divisor, best_divisor, best_baud, best_baud_diff;
1005 divisor = 24000000 / baudrate;
1008 // Round down to supported fraction (AM only)
1009 divisor -= am_adjust_dn[divisor & 7];
1011 // Try this divisor and the one above it (because division rounds down)
1015 for (i = 0; i < 2; i++)
1017 int try_divisor = divisor + i;
1021 // Round up to supported divisor value
1022 if (try_divisor <= 8)
1024 // Round up to minimum supported divisor
1027 else if (divisor < 16)
1029 // AM doesn't support divisors 9 through 15 inclusive
1034 // Round up to supported fraction (AM only)
1035 try_divisor += am_adjust_up[try_divisor & 7];
1036 if (try_divisor > 0x1FFF8)
1038 // Round down to maximum supported divisor value (for AM)
1039 try_divisor = 0x1FFF8;
1042 // Get estimated baud rate (to nearest integer)
1043 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1044 // Get absolute difference from requested baud rate
1045 if (baud_estimate < baudrate)
1047 baud_diff = baudrate - baud_estimate;
1051 baud_diff = baud_estimate - baudrate;
1053 if (i == 0 || baud_diff < best_baud_diff)
1055 // Closest to requested baud rate so far
1056 best_divisor = try_divisor;
1057 best_baud = baud_estimate;
1058 best_baud_diff = baud_diff;
1061 // Spot on! No point trying
1066 // Encode the best divisor value
1067 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1068 // Deal with special cases for encoded value
1069 if (*encoded_divisor == 1)
1071 *encoded_divisor = 0; // 3000000 baud
1073 else if (*encoded_divisor == 0x4001)
1075 *encoded_divisor = 1; // 2000000 baud (BM only)
1080 /* ftdi_to_clkbits Convert a requested baudrate for a given system clock and predivisor
1081 to encoded divisor and the achievable baudrate
1082 Function is only used internally
1089 From /2, 0.125 steps may be taken.
1090 The fractional part has frac_code encoding
1092 value[13:0] of value is the divisor
1093 index[9] mean 12 MHz Base(120 MHz/10) rate versus 3 MHz (48 MHz/16) else
1095 H Type have all features above with
1096 {index[8],value[15:14]} is the encoded subdivisor
1098 FT232R, FT2232 and FT232BM have no option for 12 MHz and with
1099 {index[0],value[15:14]} is the encoded subdivisor
1101 AM Type chips have only four fractional subdivisors at value[15:14]
1102 for subdivisors 0, 0.5, 0.25, 0.125
1104 static int ftdi_to_clkbits(int baudrate, unsigned int clk, int clk_div, unsigned long *encoded_divisor)
1106 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1108 int divisor, best_divisor;
1109 if (baudrate >= clk/clk_div)
1111 *encoded_divisor = 0;
1112 best_baud = clk/clk_div;
1114 else if (baudrate >= clk/(clk_div + clk_div/2))
1116 *encoded_divisor = 1;
1117 best_baud = clk/(clk_div + clk_div/2);
1119 else if (baudrate >= clk/(2*clk_div))
1121 *encoded_divisor = 2;
1122 best_baud = clk/(2*clk_div);
1126 /* We divide by 16 to have 3 fractional bits and one bit for rounding */
1127 divisor = clk*16/clk_div / baudrate;
1128 if (divisor & 1) /* Decide if to round up or down*/
1129 best_divisor = divisor /2 +1;
1131 best_divisor = divisor/2;
1132 if(best_divisor > 0x20000)
1133 best_divisor = 0x1ffff;
1134 best_baud = clk*16/clk_div/best_divisor;
1135 if (best_baud & 1) /* Decide if to round up or down*/
1136 best_baud = best_baud /2 +1;
1138 best_baud = best_baud /2;
1139 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 0x7] << 14);
1144 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
1145 Function is only used internally
1148 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
1149 unsigned short *value, unsigned short *index)
1152 unsigned long encoded_divisor;
1160 #define H_CLK 120000000
1161 #define C_CLK 48000000
1162 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H) || (ftdi->type == TYPE_232H ))
1164 if(baudrate*10 > H_CLK /0x3fff)
1166 /* On H Devices, use 12 000 000 Baudrate when possible
1167 We have a 14 bit divisor, a 1 bit divisor switch (10 or 16)
1168 three fractional bits and a 120 MHz clock
1169 Assume AN_120 "Sub-integer divisors between 0 and 2 are not allowed" holds for
1170 DIV/10 CLK too, so /1, /1.5 and /2 can be handled the same*/
1171 best_baud = ftdi_to_clkbits(baudrate, H_CLK, 10, &encoded_divisor);
1172 encoded_divisor |= 0x20000; /* switch on CLK/10*/
1175 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1177 else if ((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C) || (ftdi->type == TYPE_R ))
1179 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1183 best_baud = ftdi_to_clkbits_AM(baudrate, &encoded_divisor);
1185 // Split into "value" and "index" values
1186 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1187 if (ftdi->type == TYPE_2232H ||
1188 ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H )
1190 *index = (unsigned short)(encoded_divisor >> 8);
1192 *index |= ftdi->index;
1195 *index = (unsigned short)(encoded_divisor >> 16);
1197 // Return the nearest baud rate
1202 * @brief Wrapper function to export ftdi_convert_baudrate() to the unit test
1203 * Do not use, it's only for the unit test framework
1205 int convert_baudrate_UT_export(int baudrate, struct ftdi_context *ftdi,
1206 unsigned short *value, unsigned short *index)
1208 return ftdi_convert_baudrate(baudrate, ftdi, value, index);
1212 Sets the chip baud rate
1214 \param ftdi pointer to ftdi_context
1215 \param baudrate baud rate to set
1218 \retval -1: invalid baudrate
1219 \retval -2: setting baudrate failed
1220 \retval -3: USB device unavailable
1222 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1224 unsigned short value, index;
1225 int actual_baudrate;
1227 if (ftdi == NULL || ftdi->usb_dev == NULL)
1228 ftdi_error_return(-3, "USB device unavailable");
1230 if (ftdi->bitbang_enabled)
1232 baudrate = baudrate*4;
1235 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1236 if (actual_baudrate <= 0)
1237 ftdi_error_return (-1, "Silly baudrate <= 0.");
1239 // Check within tolerance (about 5%)
1240 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1241 || ((actual_baudrate < baudrate)
1242 ? (actual_baudrate * 21 < baudrate * 20)
1243 : (baudrate * 21 < actual_baudrate * 20)))
1244 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1246 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1247 SIO_SET_BAUDRATE_REQUEST, value,
1248 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1249 ftdi_error_return (-2, "Setting new baudrate failed");
1251 ftdi->baudrate = baudrate;
1256 Set (RS232) line characteristics.
1257 The break type can only be set via ftdi_set_line_property2()
1258 and defaults to "off".
1260 \param ftdi pointer to ftdi_context
1261 \param bits Number of bits
1262 \param sbit Number of stop bits
1263 \param parity Parity mode
1266 \retval -1: Setting line property failed
1268 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1269 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1271 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1275 Set (RS232) line characteristics
1277 \param ftdi pointer to ftdi_context
1278 \param bits Number of bits
1279 \param sbit Number of stop bits
1280 \param parity Parity mode
1281 \param break_type Break type
1284 \retval -1: Setting line property failed
1285 \retval -2: USB device unavailable
1287 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1288 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1289 enum ftdi_break_type break_type)
1291 unsigned short value = bits;
1293 if (ftdi == NULL || ftdi->usb_dev == NULL)
1294 ftdi_error_return(-2, "USB device unavailable");
1299 value |= (0x00 << 8);
1302 value |= (0x01 << 8);
1305 value |= (0x02 << 8);
1308 value |= (0x03 << 8);
1311 value |= (0x04 << 8);
1318 value |= (0x00 << 11);
1321 value |= (0x01 << 11);
1324 value |= (0x02 << 11);
1331 value |= (0x00 << 14);
1334 value |= (0x01 << 14);
1338 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1339 SIO_SET_DATA_REQUEST, value,
1340 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1341 ftdi_error_return (-1, "Setting new line property failed");
1347 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1349 \param ftdi pointer to ftdi_context
1350 \param buf Buffer with the data
1351 \param size Size of the buffer
1353 \retval -666: USB device unavailable
1354 \retval <0: error code from usb_bulk_write()
1355 \retval >0: number of bytes written
1357 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1362 if (ftdi == NULL || ftdi->usb_dev == NULL)
1363 ftdi_error_return(-666, "USB device unavailable");
1365 while (offset < size)
1367 int write_size = ftdi->writebuffer_chunksize;
1369 if (offset+write_size > size)
1370 write_size = size-offset;
1372 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1373 ftdi_error_return(-1, "usb bulk write failed");
1375 offset += actual_length;
1381 static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1383 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1384 struct ftdi_context *ftdi = tc->ftdi;
1385 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1387 packet_size = ftdi->max_packet_size;
1389 actual_length = transfer->actual_length;
1391 if (actual_length > 2)
1393 // skip FTDI status bytes.
1394 // Maybe stored in the future to enable modem use
1395 num_of_chunks = actual_length / packet_size;
1396 chunk_remains = actual_length % packet_size;
1397 //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);
1399 ftdi->readbuffer_offset += 2;
1402 if (actual_length > packet_size - 2)
1404 for (i = 1; i < num_of_chunks; i++)
1405 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1406 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1408 if (chunk_remains > 2)
1410 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1411 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1413 actual_length -= 2*num_of_chunks;
1416 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1419 if (actual_length > 0)
1421 // data still fits in buf?
1422 if (tc->offset + actual_length <= tc->size)
1424 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1425 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1426 tc->offset += actual_length;
1428 ftdi->readbuffer_offset = 0;
1429 ftdi->readbuffer_remaining = 0;
1431 /* Did we read exactly the right amount of bytes? */
1432 if (tc->offset == tc->size)
1434 //printf("read_data exact rem %d offset %d\n",
1435 //ftdi->readbuffer_remaining, offset);
1442 // only copy part of the data or size <= readbuffer_chunksize
1443 int part_size = tc->size - tc->offset;
1444 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1445 tc->offset += part_size;
1447 ftdi->readbuffer_offset += part_size;
1448 ftdi->readbuffer_remaining = actual_length - part_size;
1450 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1451 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1457 ret = libusb_submit_transfer (transfer);
1463 static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1465 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1466 struct ftdi_context *ftdi = tc->ftdi;
1468 tc->offset += transfer->actual_length;
1470 if (tc->offset == tc->size)
1476 int write_size = ftdi->writebuffer_chunksize;
1479 if (tc->offset + write_size > tc->size)
1480 write_size = tc->size - tc->offset;
1482 transfer->length = write_size;
1483 transfer->buffer = tc->buf + tc->offset;
1484 ret = libusb_submit_transfer (transfer);
1492 Writes data to the chip. Does not wait for completion of the transfer
1493 nor does it make sure that the transfer was successful.
1495 Use libusb 1.0 asynchronous API.
1497 \param ftdi pointer to ftdi_context
1498 \param buf Buffer with the data
1499 \param size Size of the buffer
1501 \retval NULL: Some error happens when submit transfer
1502 \retval !NULL: Pointer to a ftdi_transfer_control
1505 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1507 struct ftdi_transfer_control *tc;
1508 struct libusb_transfer *transfer;
1509 int write_size, ret;
1511 if (ftdi == NULL || ftdi->usb_dev == NULL)
1514 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1518 transfer = libusb_alloc_transfer(0);
1531 if (size < ftdi->writebuffer_chunksize)
1534 write_size = ftdi->writebuffer_chunksize;
1536 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf,
1537 write_size, ftdi_write_data_cb, tc,
1538 ftdi->usb_write_timeout);
1539 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1541 ret = libusb_submit_transfer(transfer);
1544 libusb_free_transfer(transfer);
1548 tc->transfer = transfer;
1554 Reads data from the chip. Does not wait for completion of the transfer
1555 nor does it make sure that the transfer was successful.
1557 Use libusb 1.0 asynchronous API.
1559 \param ftdi pointer to ftdi_context
1560 \param buf Buffer with the data
1561 \param size Size of the buffer
1563 \retval NULL: Some error happens when submit transfer
1564 \retval !NULL: Pointer to a ftdi_transfer_control
1567 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1569 struct ftdi_transfer_control *tc;
1570 struct libusb_transfer *transfer;
1573 if (ftdi == NULL || ftdi->usb_dev == NULL)
1576 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1584 if (size <= ftdi->readbuffer_remaining)
1586 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1589 ftdi->readbuffer_remaining -= size;
1590 ftdi->readbuffer_offset += size;
1592 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1596 tc->transfer = NULL;
1601 if (ftdi->readbuffer_remaining != 0)
1603 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1605 tc->offset = ftdi->readbuffer_remaining;
1610 transfer = libusb_alloc_transfer(0);
1617 ftdi->readbuffer_remaining = 0;
1618 ftdi->readbuffer_offset = 0;
1620 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);
1621 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1623 ret = libusb_submit_transfer(transfer);
1626 libusb_free_transfer(transfer);
1630 tc->transfer = transfer;
1636 Wait for completion of the transfer.
1638 Use libusb 1.0 asynchronous API.
1640 \param tc pointer to ftdi_transfer_control
1642 \retval < 0: Some error happens
1643 \retval >= 0: Data size transferred
1646 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1650 while (!tc->completed)
1652 ret = libusb_handle_events(tc->ftdi->usb_ctx);
1655 if (ret == LIBUSB_ERROR_INTERRUPTED)
1657 libusb_cancel_transfer(tc->transfer);
1658 while (!tc->completed)
1659 if (libusb_handle_events(tc->ftdi->usb_ctx) < 0)
1661 libusb_free_transfer(tc->transfer);
1669 * tc->transfer could be NULL if "(size <= ftdi->readbuffer_remaining)"
1670 * at ftdi_read_data_submit(). Therefore, we need to check it here.
1674 if (tc->transfer->status != LIBUSB_TRANSFER_COMPLETED)
1676 libusb_free_transfer(tc->transfer);
1683 Configure write buffer chunk size.
1686 \param ftdi pointer to ftdi_context
1687 \param chunksize Chunk size
1690 \retval -1: ftdi context invalid
1692 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1695 ftdi_error_return(-1, "ftdi context invalid");
1697 ftdi->writebuffer_chunksize = chunksize;
1702 Get write buffer chunk size.
1704 \param ftdi pointer to ftdi_context
1705 \param chunksize Pointer to store chunk size in
1708 \retval -1: ftdi context invalid
1710 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1713 ftdi_error_return(-1, "ftdi context invalid");
1715 *chunksize = ftdi->writebuffer_chunksize;
1720 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1722 Automatically strips the two modem status bytes transfered during every read.
1724 \param ftdi pointer to ftdi_context
1725 \param buf Buffer to store data in
1726 \param size Size of the buffer
1728 \retval -666: USB device unavailable
1729 \retval <0: error code from libusb_bulk_transfer()
1730 \retval 0: no data was available
1731 \retval >0: number of bytes read
1734 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1736 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1737 int packet_size = ftdi->max_packet_size;
1738 int actual_length = 1;
1740 if (ftdi == NULL || ftdi->usb_dev == NULL)
1741 ftdi_error_return(-666, "USB device unavailable");
1743 // Packet size sanity check (avoid division by zero)
1744 if (packet_size == 0)
1745 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1747 // everything we want is still in the readbuffer?
1748 if (size <= ftdi->readbuffer_remaining)
1750 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1753 ftdi->readbuffer_remaining -= size;
1754 ftdi->readbuffer_offset += size;
1756 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1760 // something still in the readbuffer, but not enough to satisfy 'size'?
1761 if (ftdi->readbuffer_remaining != 0)
1763 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1766 offset += ftdi->readbuffer_remaining;
1768 // do the actual USB read
1769 while (offset < size && actual_length > 0)
1771 ftdi->readbuffer_remaining = 0;
1772 ftdi->readbuffer_offset = 0;
1773 /* returns how much received */
1774 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1776 ftdi_error_return(ret, "usb bulk read failed");
1778 if (actual_length > 2)
1780 // skip FTDI status bytes.
1781 // Maybe stored in the future to enable modem use
1782 num_of_chunks = actual_length / packet_size;
1783 chunk_remains = actual_length % packet_size;
1784 //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);
1786 ftdi->readbuffer_offset += 2;
1789 if (actual_length > packet_size - 2)
1791 for (i = 1; i < num_of_chunks; i++)
1792 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1793 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1795 if (chunk_remains > 2)
1797 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1798 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1800 actual_length -= 2*num_of_chunks;
1803 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1806 else if (actual_length <= 2)
1808 // no more data to read?
1811 if (actual_length > 0)
1813 // data still fits in buf?
1814 if (offset+actual_length <= size)
1816 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1817 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1818 offset += actual_length;
1820 /* Did we read exactly the right amount of bytes? */
1822 //printf("read_data exact rem %d offset %d\n",
1823 //ftdi->readbuffer_remaining, offset);
1828 // only copy part of the data or size <= readbuffer_chunksize
1829 int part_size = size-offset;
1830 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1832 ftdi->readbuffer_offset += part_size;
1833 ftdi->readbuffer_remaining = actual_length-part_size;
1834 offset += part_size;
1836 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1837 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1848 Configure read buffer chunk size.
1851 Automatically reallocates the buffer.
1853 \param ftdi pointer to ftdi_context
1854 \param chunksize Chunk size
1857 \retval -1: ftdi context invalid
1859 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1861 unsigned char *new_buf;
1864 ftdi_error_return(-1, "ftdi context invalid");
1866 // Invalidate all remaining data
1867 ftdi->readbuffer_offset = 0;
1868 ftdi->readbuffer_remaining = 0;
1870 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1871 which is defined in libusb-1.0. Otherwise, each USB read request will
1872 be divided into multiple URBs. This will cause issues on Linux kernel
1873 older than 2.6.32. */
1874 if (chunksize > 16384)
1878 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1879 ftdi_error_return(-1, "out of memory for readbuffer");
1881 ftdi->readbuffer = new_buf;
1882 ftdi->readbuffer_chunksize = chunksize;
1888 Get read buffer chunk size.
1890 \param ftdi pointer to ftdi_context
1891 \param chunksize Pointer to store chunk size in
1894 \retval -1: FTDI context invalid
1896 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1899 ftdi_error_return(-1, "FTDI context invalid");
1901 *chunksize = ftdi->readbuffer_chunksize;
1906 Enable/disable bitbang modes.
1908 \param ftdi pointer to ftdi_context
1909 \param bitmask Bitmask to configure lines.
1910 HIGH/ON value configures a line as output.
1911 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1914 \retval -1: can't enable bitbang mode
1915 \retval -2: USB device unavailable
1917 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1919 unsigned short usb_val;
1921 if (ftdi == NULL || ftdi->usb_dev == NULL)
1922 ftdi_error_return(-2, "USB device unavailable");
1924 usb_val = bitmask; // low byte: bitmask
1925 usb_val |= (mode << 8);
1926 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)
1927 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a BM/2232C type chip?");
1929 ftdi->bitbang_mode = mode;
1930 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1935 Disable bitbang mode.
1937 \param ftdi pointer to ftdi_context
1940 \retval -1: can't disable bitbang mode
1941 \retval -2: USB device unavailable
1943 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1945 if (ftdi == NULL || ftdi->usb_dev == NULL)
1946 ftdi_error_return(-2, "USB device unavailable");
1948 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)
1949 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1951 ftdi->bitbang_enabled = 0;
1957 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1959 \param ftdi pointer to ftdi_context
1960 \param pins Pointer to store pins into
1963 \retval -1: read pins failed
1964 \retval -2: USB device unavailable
1966 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1968 if (ftdi == NULL || ftdi->usb_dev == NULL)
1969 ftdi_error_return(-2, "USB device unavailable");
1971 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)
1972 ftdi_error_return(-1, "read pins failed");
1980 The FTDI chip keeps data in the internal buffer for a specific
1981 amount of time if the buffer is not full yet to decrease
1982 load on the usb bus.
1984 \param ftdi pointer to ftdi_context
1985 \param latency Value between 1 and 255
1988 \retval -1: latency out of range
1989 \retval -2: unable to set latency timer
1990 \retval -3: USB device unavailable
1992 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1994 unsigned short usb_val;
1997 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1999 if (ftdi == NULL || ftdi->usb_dev == NULL)
2000 ftdi_error_return(-3, "USB device unavailable");
2003 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)
2004 ftdi_error_return(-2, "unable to set latency timer");
2012 \param ftdi pointer to ftdi_context
2013 \param latency Pointer to store latency value in
2016 \retval -1: unable to get latency timer
2017 \retval -2: USB device unavailable
2019 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
2021 unsigned short usb_val;
2023 if (ftdi == NULL || ftdi->usb_dev == NULL)
2024 ftdi_error_return(-2, "USB device unavailable");
2026 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)
2027 ftdi_error_return(-1, "reading latency timer failed");
2029 *latency = (unsigned char)usb_val;
2034 Poll modem status information
2036 This function allows the retrieve the two status bytes of the device.
2037 The device sends these bytes also as a header for each read access
2038 where they are discarded by ftdi_read_data(). The chip generates
2039 the two stripped status bytes in the absence of data every 40 ms.
2041 Layout of the first byte:
2042 - B0..B3 - must be 0
2043 - B4 Clear to send (CTS)
2046 - B5 Data set ready (DTS)
2049 - B6 Ring indicator (RI)
2052 - B7 Receive line signal detect (RLSD)
2056 Layout of the second byte:
2057 - B0 Data ready (DR)
2058 - B1 Overrun error (OE)
2059 - B2 Parity error (PE)
2060 - B3 Framing error (FE)
2061 - B4 Break interrupt (BI)
2062 - B5 Transmitter holding register (THRE)
2063 - B6 Transmitter empty (TEMT)
2064 - B7 Error in RCVR FIFO
2066 \param ftdi pointer to ftdi_context
2067 \param status Pointer to store status information in. Must be two bytes.
2070 \retval -1: unable to retrieve status information
2071 \retval -2: USB device unavailable
2073 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
2077 if (ftdi == NULL || ftdi->usb_dev == NULL)
2078 ftdi_error_return(-2, "USB device unavailable");
2080 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)
2081 ftdi_error_return(-1, "getting modem status failed");
2083 *status = (usb_val[1] << 8) | (usb_val[0] & 0xFF);
2089 Set flowcontrol for ftdi chip
2091 \param ftdi pointer to ftdi_context
2092 \param flowctrl flow control to use. should be
2093 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
2096 \retval -1: set flow control failed
2097 \retval -2: USB device unavailable
2099 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
2101 if (ftdi == NULL || ftdi->usb_dev == NULL)
2102 ftdi_error_return(-2, "USB device unavailable");
2104 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2105 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
2106 NULL, 0, ftdi->usb_write_timeout) < 0)
2107 ftdi_error_return(-1, "set flow control failed");
2115 \param ftdi pointer to ftdi_context
2116 \param state state to set line to (1 or 0)
2119 \retval -1: set dtr failed
2120 \retval -2: USB device unavailable
2122 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2124 unsigned short usb_val;
2126 if (ftdi == NULL || ftdi->usb_dev == NULL)
2127 ftdi_error_return(-2, "USB device unavailable");
2130 usb_val = SIO_SET_DTR_HIGH;
2132 usb_val = SIO_SET_DTR_LOW;
2134 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2135 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2136 NULL, 0, ftdi->usb_write_timeout) < 0)
2137 ftdi_error_return(-1, "set dtr failed");
2145 \param ftdi pointer to ftdi_context
2146 \param state state to set line to (1 or 0)
2149 \retval -1: set rts failed
2150 \retval -2: USB device unavailable
2152 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2154 unsigned short usb_val;
2156 if (ftdi == NULL || ftdi->usb_dev == NULL)
2157 ftdi_error_return(-2, "USB device unavailable");
2160 usb_val = SIO_SET_RTS_HIGH;
2162 usb_val = SIO_SET_RTS_LOW;
2164 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2165 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2166 NULL, 0, ftdi->usb_write_timeout) < 0)
2167 ftdi_error_return(-1, "set of rts failed");
2173 Set dtr and rts line in one pass
2175 \param ftdi pointer to ftdi_context
2176 \param dtr DTR state to set line to (1 or 0)
2177 \param rts RTS state to set line to (1 or 0)
2180 \retval -1: set dtr/rts failed
2181 \retval -2: USB device unavailable
2183 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2185 unsigned short usb_val;
2187 if (ftdi == NULL || ftdi->usb_dev == NULL)
2188 ftdi_error_return(-2, "USB device unavailable");
2191 usb_val = SIO_SET_DTR_HIGH;
2193 usb_val = SIO_SET_DTR_LOW;
2196 usb_val |= SIO_SET_RTS_HIGH;
2198 usb_val |= SIO_SET_RTS_LOW;
2200 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2201 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2202 NULL, 0, ftdi->usb_write_timeout) < 0)
2203 ftdi_error_return(-1, "set of rts/dtr failed");
2209 Set the special event character
2211 \param ftdi pointer to ftdi_context
2212 \param eventch Event character
2213 \param enable 0 to disable the event character, non-zero otherwise
2216 \retval -1: unable to set event character
2217 \retval -2: USB device unavailable
2219 int ftdi_set_event_char(struct ftdi_context *ftdi,
2220 unsigned char eventch, unsigned char enable)
2222 unsigned short usb_val;
2224 if (ftdi == NULL || ftdi->usb_dev == NULL)
2225 ftdi_error_return(-2, "USB device unavailable");
2231 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)
2232 ftdi_error_return(-1, "setting event character failed");
2240 \param ftdi pointer to ftdi_context
2241 \param errorch Error character
2242 \param enable 0 to disable the error character, non-zero otherwise
2245 \retval -1: unable to set error character
2246 \retval -2: USB device unavailable
2248 int ftdi_set_error_char(struct ftdi_context *ftdi,
2249 unsigned char errorch, unsigned char enable)
2251 unsigned short usb_val;
2253 if (ftdi == NULL || ftdi->usb_dev == NULL)
2254 ftdi_error_return(-2, "USB device unavailable");
2260 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)
2261 ftdi_error_return(-1, "setting error character failed");
2267 Init eeprom with default values for the connected device
2268 \param ftdi pointer to ftdi_context
2269 \param manufacturer String to use as Manufacturer
2270 \param product String to use as Product description
2271 \param serial String to use as Serial number description
2274 \retval -1: No struct ftdi_context
2275 \retval -2: No struct ftdi_eeprom
2276 \retval -3: No connected device or device not yet opened
2278 int ftdi_eeprom_initdefaults(struct ftdi_context *ftdi, char * manufacturer,
2279 char * product, char * serial)
2281 struct ftdi_eeprom *eeprom;
2284 ftdi_error_return(-1, "No struct ftdi_context");
2286 if (ftdi->eeprom == NULL)
2287 ftdi_error_return(-2,"No struct ftdi_eeprom");
2289 eeprom = ftdi->eeprom;
2290 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2292 if (ftdi->usb_dev == NULL)
2293 ftdi_error_return(-3, "No connected device or device not yet opened");
2295 eeprom->vendor_id = 0x0403;
2296 eeprom->use_serial = 1;
2297 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM) ||
2298 (ftdi->type == TYPE_R))
2299 eeprom->product_id = 0x6001;
2300 else if (ftdi->type == TYPE_4232H)
2301 eeprom->product_id = 0x6011;
2302 else if (ftdi->type == TYPE_232H)
2303 eeprom->product_id = 0x6014;
2305 eeprom->product_id = 0x6010;
2306 if (ftdi->type == TYPE_AM)
2307 eeprom->usb_version = 0x0101;
2309 eeprom->usb_version = 0x0200;
2310 eeprom->max_power = 100;
2312 if (eeprom->manufacturer)
2313 free (eeprom->manufacturer);
2314 eeprom->manufacturer = NULL;
2317 eeprom->manufacturer = malloc(strlen(manufacturer)+1);
2318 if (eeprom->manufacturer)
2319 strcpy(eeprom->manufacturer, manufacturer);
2322 if (eeprom->product)
2323 free (eeprom->product);
2324 eeprom->product = NULL;
2327 eeprom->product = malloc(strlen(product)+1);
2328 if (eeprom->product)
2329 strcpy(eeprom->product, product);
2333 const char* default_product;
2336 case TYPE_AM: default_product = "AM"; break;
2337 case TYPE_BM: default_product = "BM"; break;
2338 case TYPE_2232C: default_product = "Dual RS232"; break;
2339 case TYPE_R: default_product = "FT232R USB UART"; break;
2340 case TYPE_2232H: default_product = "Dual RS232-HS"; break;
2341 case TYPE_4232H: default_product = "FT4232H"; break;
2342 case TYPE_232H: default_product = "Single-RS232-HS"; break;
2344 ftdi_error_return(-3, "Unknown chip type");
2346 eeprom->product = malloc(strlen(default_product) +1);
2347 if (eeprom->product)
2348 strcpy(eeprom->product, default_product);
2352 free (eeprom->serial);
2353 eeprom->serial = NULL;
2356 eeprom->serial = malloc(strlen(serial)+1);
2358 strcpy(eeprom->serial, serial);
2362 if (ftdi->type == TYPE_R)
2364 eeprom->max_power = 90;
2365 eeprom->size = 0x80;
2366 eeprom->cbus_function[0] = CBUS_TXLED;
2367 eeprom->cbus_function[1] = CBUS_RXLED;
2368 eeprom->cbus_function[2] = CBUS_TXDEN;
2369 eeprom->cbus_function[3] = CBUS_PWREN;
2370 eeprom->cbus_function[4] = CBUS_SLEEP;
2374 if(ftdi->type == TYPE_232H)
2377 for (i=0; i<10; i++)
2378 eeprom->cbus_function[i] = CBUSH_TRISTATE;
2382 eeprom->initialized_for_connected_device = 1;
2385 /*FTD2XX doesn't check for values not fitting in the ACBUS Signal oprtions*/
2386 void set_ft232h_cbus(struct ftdi_eeprom *eeprom, unsigned char * output)
2391 int mode_low, mode_high;
2392 if (eeprom->cbus_function[2*i]> CBUSH_CLK7_5)
2393 mode_low = CBUSH_TRISTATE;
2395 mode_low = eeprom->cbus_function[2*i];
2396 if (eeprom->cbus_function[2*i+1]> CBUSH_CLK7_5)
2397 mode_high = CBUSH_TRISTATE;
2399 mode_high = eeprom->cbus_function[2*i];
2401 output[0x18+i] = mode_high <<4 | mode_low;
2404 /* Return the bits for the encoded EEPROM Structure of a requested Mode
2407 static unsigned char type2bit(unsigned char type, enum ftdi_chip_type chip)
2416 case CHANNEL_IS_UART: return 0;
2417 case CHANNEL_IS_FIFO: return 0x01;
2418 case CHANNEL_IS_OPTO: return 0x02;
2419 case CHANNEL_IS_CPU : return 0x04;
2427 case CHANNEL_IS_UART : return 0;
2428 case CHANNEL_IS_FIFO : return 0x01;
2429 case CHANNEL_IS_OPTO : return 0x02;
2430 case CHANNEL_IS_CPU : return 0x04;
2431 case CHANNEL_IS_FT1284 : return 0x08;
2441 Build binary buffer from ftdi_eeprom structure.
2442 Output is suitable for ftdi_write_eeprom().
2444 \param ftdi pointer to ftdi_context
2446 \retval >=0: size of eeprom user area in bytes
2447 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2448 \retval -2: Invalid eeprom or ftdi pointer
2449 \retval -3: Invalid cbus function setting (FIXME: Not in the code?)
2450 \retval -4: Chip doesn't support invert (FIXME: Not in the code?)
2451 \retval -5: Chip doesn't support high current drive (FIXME: Not in the code?)
2452 \retval -6: No connected EEPROM or EEPROM Type unknown
2454 int ftdi_eeprom_build(struct ftdi_context *ftdi)
2456 unsigned char i, j, eeprom_size_mask;
2457 unsigned short checksum, value;
2458 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2460 struct ftdi_eeprom *eeprom;
2461 unsigned char * output;
2464 ftdi_error_return(-2,"No context");
2465 if (ftdi->eeprom == NULL)
2466 ftdi_error_return(-2,"No eeprom structure");
2468 eeprom= ftdi->eeprom;
2469 output = eeprom->buf;
2471 if (eeprom->chip == -1)
2472 ftdi_error_return(-6,"No connected EEPROM or EEPROM type unknown");
2474 if ((eeprom->chip == 0x56) || (eeprom->chip == 0x66))
2475 eeprom->size = 0x100;
2477 eeprom->size = 0x80;
2479 if (eeprom->manufacturer != NULL)
2480 manufacturer_size = strlen(eeprom->manufacturer);
2481 if (eeprom->product != NULL)
2482 product_size = strlen(eeprom->product);
2483 if (eeprom->serial != NULL)
2484 serial_size = strlen(eeprom->serial);
2486 // eeprom size check
2491 user_area_size = 96; // base size for strings (total of 48 characters)
2494 user_area_size = 90; // two extra config bytes and 4 bytes PnP stuff
2497 user_area_size = 88; // four extra config bytes + 4 bytes PnP stuff
2499 case TYPE_2232H: // six extra config bytes + 4 bytes PnP stuff
2501 user_area_size = 86;
2504 user_area_size = 80;
2510 user_area_size -= (manufacturer_size + product_size + serial_size) * 2;
2512 if (user_area_size < 0)
2513 ftdi_error_return(-1,"eeprom size exceeded");
2516 memset (ftdi->eeprom->buf, 0, FTDI_MAX_EEPROM_SIZE);
2518 // Bytes and Bits set for all Types
2520 // Addr 02: Vendor ID
2521 output[0x02] = eeprom->vendor_id;
2522 output[0x03] = eeprom->vendor_id >> 8;
2524 // Addr 04: Product ID
2525 output[0x04] = eeprom->product_id;
2526 output[0x05] = eeprom->product_id >> 8;
2528 // Addr 06: Device release number (0400h for BM features)
2529 output[0x06] = 0x00;
2533 output[0x07] = 0x02;
2536 output[0x07] = 0x04;
2539 output[0x07] = 0x05;
2542 output[0x07] = 0x06;
2545 output[0x07] = 0x07;
2548 output[0x07] = 0x08;
2551 output[0x07] = 0x09;
2554 output[0x07] = 0x00;
2557 // Addr 08: Config descriptor
2559 // Bit 6: 1 if this device is self powered, 0 if bus powered
2560 // Bit 5: 1 if this device uses remote wakeup
2561 // Bit 4-0: reserved - 0
2563 if (eeprom->self_powered == 1)
2565 if (eeprom->remote_wakeup == 1)
2569 // Addr 09: Max power consumption: max power = value * 2 mA
2570 output[0x09] = eeprom->max_power>>1;
2572 if (ftdi->type != TYPE_AM)
2574 // Addr 0A: Chip configuration
2575 // Bit 7: 0 - reserved
2576 // Bit 6: 0 - reserved
2577 // Bit 5: 0 - reserved
2578 // Bit 4: 1 - Change USB version
2579 // Bit 3: 1 - Use the serial number string
2580 // Bit 2: 1 - Enable suspend pull downs for lower power
2581 // Bit 1: 1 - Out EndPoint is Isochronous
2582 // Bit 0: 1 - In EndPoint is Isochronous
2585 if (eeprom->in_is_isochronous == 1)
2587 if (eeprom->out_is_isochronous == 1)
2593 // Strings start at 0x94 (TYPE_AM, TYPE_BM)
2594 // 0x96 (TYPE_2232C), 0x98 (TYPE_R) and 0x9a (TYPE_x232H)
2612 /* Wrap around 0x80 for 128 byte EEPROMS (Internale and 93x46) */
2613 eeprom_size_mask = eeprom->size -1;
2615 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2616 // Addr 0F: Length of manufacturer string
2617 // Output manufacturer
2618 output[0x0E] = i; // calculate offset
2619 output[i & eeprom_size_mask] = manufacturer_size*2 + 2, i++;
2620 output[i & eeprom_size_mask] = 0x03, i++; // type: string
2621 for (j = 0; j < manufacturer_size; j++)
2623 output[i & eeprom_size_mask] = eeprom->manufacturer[j], i++;
2624 output[i & eeprom_size_mask] = 0x00, i++;
2626 output[0x0F] = manufacturer_size*2 + 2;
2628 // Addr 10: Offset of the product string + 0x80, calculated later
2629 // Addr 11: Length of product string
2630 output[0x10] = i | 0x80; // calculate offset
2631 output[i & eeprom_size_mask] = product_size*2 + 2, i++;
2632 output[i & eeprom_size_mask] = 0x03, i++;
2633 for (j = 0; j < product_size; j++)
2635 output[i & eeprom_size_mask] = eeprom->product[j], i++;
2636 output[i & eeprom_size_mask] = 0x00, i++;
2638 output[0x11] = product_size*2 + 2;
2640 // Addr 12: Offset of the serial string + 0x80, calculated later
2641 // Addr 13: Length of serial string
2642 output[0x12] = i | 0x80; // calculate offset
2643 output[i & eeprom_size_mask] = serial_size*2 + 2, i++;
2644 output[i & eeprom_size_mask] = 0x03, i++;
2645 for (j = 0; j < serial_size; j++)
2647 output[i & eeprom_size_mask] = eeprom->serial[j], i++;
2648 output[i & eeprom_size_mask] = 0x00, i++;
2651 // Legacy port name and PnP fields for FT2232 and newer chips
2652 if (ftdi->type > TYPE_BM)
2654 output[i & eeprom_size_mask] = 0x02; /* as seen when written with FTD2XX */
2656 output[i & eeprom_size_mask] = 0x03; /* as seen when written with FTD2XX */
2658 output[i & eeprom_size_mask] = eeprom->is_not_pnp; /* as seen when written with FTD2XX */
2662 output[0x13] = serial_size*2 + 2;
2664 if (ftdi->type > TYPE_AM) /* use_serial not used in AM devices */
2666 if (eeprom->use_serial)
2667 output[0x0A] |= USE_SERIAL_NUM;
2669 output[0x0A] &= ~USE_SERIAL_NUM;
2672 /* Bytes and Bits specific to (some) types
2673 Write linear, as this allows easier fixing*/
2679 output[0x0C] = eeprom->usb_version & 0xff;
2680 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2681 if (eeprom->use_usb_version == USE_USB_VERSION_BIT)
2682 output[0x0A] |= USE_USB_VERSION_BIT;
2684 output[0x0A] &= ~USE_USB_VERSION_BIT;
2689 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232C);
2690 if ( eeprom->channel_a_driver == DRIVER_VCP)
2691 output[0x00] |= DRIVER_VCP;
2693 output[0x00] &= ~DRIVER_VCP;
2695 if ( eeprom->high_current_a == HIGH_CURRENT_DRIVE)
2696 output[0x00] |= HIGH_CURRENT_DRIVE;
2698 output[0x00] &= ~HIGH_CURRENT_DRIVE;
2700 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232C);
2701 if ( eeprom->channel_b_driver == DRIVER_VCP)
2702 output[0x01] |= DRIVER_VCP;
2704 output[0x01] &= ~DRIVER_VCP;
2706 if ( eeprom->high_current_b == HIGH_CURRENT_DRIVE)
2707 output[0x01] |= HIGH_CURRENT_DRIVE;
2709 output[0x01] &= ~HIGH_CURRENT_DRIVE;
2711 if (eeprom->in_is_isochronous == 1)
2712 output[0x0A] |= 0x1;
2714 output[0x0A] &= ~0x1;
2715 if (eeprom->out_is_isochronous == 1)
2716 output[0x0A] |= 0x2;
2718 output[0x0A] &= ~0x2;
2719 if (eeprom->suspend_pull_downs == 1)
2720 output[0x0A] |= 0x4;
2722 output[0x0A] &= ~0x4;
2723 if (eeprom->use_usb_version == USE_USB_VERSION_BIT)
2724 output[0x0A] |= USE_USB_VERSION_BIT;
2726 output[0x0A] &= ~USE_USB_VERSION_BIT;
2728 output[0x0C] = eeprom->usb_version & 0xff;
2729 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2730 output[0x14] = eeprom->chip;
2733 if (eeprom->high_current == HIGH_CURRENT_DRIVE_R)
2734 output[0x00] |= HIGH_CURRENT_DRIVE_R;
2735 output[0x01] = 0x40; /* Hard coded Endpoint Size*/
2737 if (eeprom->suspend_pull_downs == 1)
2738 output[0x0A] |= 0x4;
2740 output[0x0A] &= ~0x4;
2741 output[0x0B] = eeprom->invert;
2742 output[0x0C] = eeprom->usb_version & 0xff;
2743 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2745 if (eeprom->cbus_function[0] > CBUS_BB)
2746 output[0x14] = CBUS_TXLED;
2748 output[0x14] = eeprom->cbus_function[0];
2750 if (eeprom->cbus_function[1] > CBUS_BB)
2751 output[0x14] |= CBUS_RXLED<<4;
2753 output[0x14] |= eeprom->cbus_function[1]<<4;
2755 if (eeprom->cbus_function[2] > CBUS_BB)
2756 output[0x15] = CBUS_TXDEN;
2758 output[0x15] = eeprom->cbus_function[2];
2760 if (eeprom->cbus_function[3] > CBUS_BB)
2761 output[0x15] |= CBUS_PWREN<<4;
2763 output[0x15] |= eeprom->cbus_function[3]<<4;
2765 if (eeprom->cbus_function[4] > CBUS_CLK6)
2766 output[0x16] = CBUS_SLEEP;
2768 output[0x16] = eeprom->cbus_function[4];
2771 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232H);
2772 if ( eeprom->channel_a_driver == DRIVER_VCP)
2773 output[0x00] |= DRIVER_VCP;
2775 output[0x00] &= ~DRIVER_VCP;
2777 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232H);
2778 if ( eeprom->channel_b_driver == DRIVER_VCP)
2779 output[0x01] |= DRIVER_VCP;
2781 output[0x01] &= ~DRIVER_VCP;
2782 if (eeprom->suspend_dbus7 == SUSPEND_DBUS7_BIT)
2783 output[0x01] |= SUSPEND_DBUS7_BIT;
2785 output[0x01] &= ~SUSPEND_DBUS7_BIT;
2787 if (eeprom->suspend_pull_downs == 1)
2788 output[0x0A] |= 0x4;
2790 output[0x0A] &= ~0x4;
2792 if (eeprom->group0_drive > DRIVE_16MA)
2793 output[0x0c] |= DRIVE_16MA;
2795 output[0x0c] |= eeprom->group0_drive;
2796 if (eeprom->group0_schmitt == IS_SCHMITT)
2797 output[0x0c] |= IS_SCHMITT;
2798 if (eeprom->group0_slew == SLOW_SLEW)
2799 output[0x0c] |= SLOW_SLEW;
2801 if (eeprom->group1_drive > DRIVE_16MA)
2802 output[0x0c] |= DRIVE_16MA<<4;
2804 output[0x0c] |= eeprom->group1_drive<<4;
2805 if (eeprom->group1_schmitt == IS_SCHMITT)
2806 output[0x0c] |= IS_SCHMITT<<4;
2807 if (eeprom->group1_slew == SLOW_SLEW)
2808 output[0x0c] |= SLOW_SLEW<<4;
2810 if (eeprom->group2_drive > DRIVE_16MA)
2811 output[0x0d] |= DRIVE_16MA;
2813 output[0x0d] |= eeprom->group2_drive;
2814 if (eeprom->group2_schmitt == IS_SCHMITT)
2815 output[0x0d] |= IS_SCHMITT;
2816 if (eeprom->group2_slew == SLOW_SLEW)
2817 output[0x0d] |= SLOW_SLEW;
2819 if (eeprom->group3_drive > DRIVE_16MA)
2820 output[0x0d] |= DRIVE_16MA<<4;
2822 output[0x0d] |= eeprom->group3_drive<<4;
2823 if (eeprom->group3_schmitt == IS_SCHMITT)
2824 output[0x0d] |= IS_SCHMITT<<4;
2825 if (eeprom->group3_slew == SLOW_SLEW)
2826 output[0x0d] |= SLOW_SLEW<<4;
2828 output[0x18] = eeprom->chip;
2832 output[0x18] = eeprom->chip;
2833 fprintf(stderr,"FIXME: Build FT4232H specific EEPROM settings\n");
2836 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_232H);
2837 if ( eeprom->channel_a_driver == DRIVER_VCP)
2838 output[0x00] |= DRIVER_VCPH;
2840 output[0x00] &= ~DRIVER_VCPH;
2841 if (eeprom->powersave)
2842 output[0x01] |= POWER_SAVE_DISABLE_H;
2844 output[0x01] &= ~POWER_SAVE_DISABLE_H;
2845 if (eeprom->clock_polarity)
2846 output[0x01] |= FT1284_CLK_IDLE_STATE;
2848 output[0x01] &= ~FT1284_CLK_IDLE_STATE;
2849 if (eeprom->data_order)
2850 output[0x01] |= FT1284_DATA_LSB;
2852 output[0x01] &= ~FT1284_DATA_LSB;
2853 if (eeprom->flow_control)
2854 output[0x01] |= FT1284_FLOW_CONTROL;
2856 output[0x01] &= ~FT1284_FLOW_CONTROL;
2857 if (eeprom->group0_drive > DRIVE_16MA)
2858 output[0x0c] |= DRIVE_16MA;
2860 output[0x0c] |= eeprom->group0_drive;
2861 if (eeprom->group0_schmitt == IS_SCHMITT)
2862 output[0x0c] |= IS_SCHMITT;
2863 if (eeprom->group0_slew == SLOW_SLEW)
2864 output[0x0c] |= SLOW_SLEW;
2866 if (eeprom->group1_drive > DRIVE_16MA)
2867 output[0x0d] |= DRIVE_16MA;
2869 output[0x0d] |= eeprom->group1_drive;
2870 if (eeprom->group1_schmitt == IS_SCHMITT)
2871 output[0x0d] |= IS_SCHMITT;
2872 if (eeprom->group1_slew == SLOW_SLEW)
2873 output[0x0d] |= SLOW_SLEW;
2875 set_ft232h_cbus(eeprom, output);
2877 output[0x1e] = eeprom->chip;
2878 fprintf(stderr,"FIXME: Build FT232H specific EEPROM settings\n");
2883 // calculate checksum
2886 for (i = 0; i < eeprom->size/2-1; i++)
2888 value = output[i*2];
2889 value += output[(i*2)+1] << 8;
2891 checksum = value^checksum;
2892 checksum = (checksum << 1) | (checksum >> 15);
2895 output[eeprom->size-2] = checksum;
2896 output[eeprom->size-1] = checksum >> 8;
2898 return user_area_size;
2900 /* Decode the encoded EEPROM field for the FTDI Mode into a value for the abstracted
2903 * FTD2XX doesn't allow to set multiple bits in the interface mode bitfield, and so do we
2905 static unsigned char bit2type(unsigned char bits)
2909 case 0: return CHANNEL_IS_UART;
2910 case 1: return CHANNEL_IS_FIFO;
2911 case 2: return CHANNEL_IS_OPTO;
2912 case 4: return CHANNEL_IS_CPU;
2913 case 8: return CHANNEL_IS_FT1284;
2915 fprintf(stderr," Unexpected value %d for Hardware Interface type\n",
2921 Decode binary EEPROM image into an ftdi_eeprom structure.
2923 \param ftdi pointer to ftdi_context
2924 \param verbose Decode EEPROM on stdout
2927 \retval -1: something went wrong
2929 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2930 FIXME: Strings are malloc'ed here and should be freed somewhere
2932 int ftdi_eeprom_decode(struct ftdi_context *ftdi, int verbose)
2935 unsigned short checksum, eeprom_checksum, value;
2936 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2938 struct ftdi_eeprom *eeprom;
2939 unsigned char *buf = ftdi->eeprom->buf;
2943 ftdi_error_return(-1,"No context");
2944 if (ftdi->eeprom == NULL)
2945 ftdi_error_return(-1,"No eeprom structure");
2947 eeprom = ftdi->eeprom;
2948 eeprom_size = eeprom->size;
2950 // Addr 02: Vendor ID
2951 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2953 // Addr 04: Product ID
2954 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2956 release = buf[0x06] + (buf[0x07]<<8);
2958 // Addr 08: Config descriptor
2960 // Bit 6: 1 if this device is self powered, 0 if bus powered
2961 // Bit 5: 1 if this device uses remote wakeup
2962 eeprom->self_powered = buf[0x08] & 0x40;
2963 eeprom->remote_wakeup = buf[0x08] & 0x20;
2965 // Addr 09: Max power consumption: max power = value * 2 mA
2966 eeprom->max_power = buf[0x09];
2968 // Addr 0A: Chip configuration
2969 // Bit 7: 0 - reserved
2970 // Bit 6: 0 - reserved
2971 // Bit 5: 0 - reserved
2972 // Bit 4: 1 - Change USB version on BM and 2232C
2973 // Bit 3: 1 - Use the serial number string
2974 // Bit 2: 1 - Enable suspend pull downs for lower power
2975 // Bit 1: 1 - Out EndPoint is Isochronous
2976 // Bit 0: 1 - In EndPoint is Isochronous
2978 eeprom->in_is_isochronous = buf[0x0A]&0x01;
2979 eeprom->out_is_isochronous = buf[0x0A]&0x02;
2980 eeprom->suspend_pull_downs = buf[0x0A]&0x04;
2981 eeprom->use_serial = (buf[0x0A] & USE_SERIAL_NUM)?1:0;
2982 eeprom->use_usb_version = buf[0x0A] & USE_USB_VERSION_BIT;
2984 // Addr 0C: USB version low byte when 0x0A
2985 // Addr 0D: USB version high byte when 0x0A
2986 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2988 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2989 // Addr 0F: Length of manufacturer string
2990 manufacturer_size = buf[0x0F]/2;
2991 if (eeprom->manufacturer)
2992 free(eeprom->manufacturer);
2993 if (manufacturer_size > 0)
2995 eeprom->manufacturer = malloc(manufacturer_size);
2996 if (eeprom->manufacturer)
2998 // Decode manufacturer
2999 i = buf[0x0E] & (eeprom_size -1); // offset
3000 for (j=0;j<manufacturer_size-1;j++)
3002 eeprom->manufacturer[j] = buf[2*j+i+2];
3004 eeprom->manufacturer[j] = '\0';
3007 else eeprom->manufacturer = NULL;
3009 // Addr 10: Offset of the product string + 0x80, calculated later
3010 // Addr 11: Length of product string
3011 if (eeprom->product)
3012 free(eeprom->product);
3013 product_size = buf[0x11]/2;
3014 if (product_size > 0)
3016 eeprom->product = malloc(product_size);
3017 if (eeprom->product)
3019 // Decode product name
3020 i = buf[0x10] & (eeprom_size -1); // offset
3021 for (j=0;j<product_size-1;j++)
3023 eeprom->product[j] = buf[2*j+i+2];
3025 eeprom->product[j] = '\0';
3028 else eeprom->product = NULL;
3030 // Addr 12: Offset of the serial string + 0x80, calculated later
3031 // Addr 13: Length of serial string
3033 free(eeprom->serial);
3034 serial_size = buf[0x13]/2;
3035 if (serial_size > 0)
3037 eeprom->serial = malloc(serial_size);
3041 i = buf[0x12] & (eeprom_size -1); // offset
3042 for (j=0;j<serial_size-1;j++)
3044 eeprom->serial[j] = buf[2*j+i+2];
3046 eeprom->serial[j] = '\0';
3049 else eeprom->serial = NULL;
3054 for (i = 0; i < eeprom_size/2-1; i++)
3057 value += buf[(i*2)+1] << 8;
3059 checksum = value^checksum;
3060 checksum = (checksum << 1) | (checksum >> 15);
3063 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
3065 if (eeprom_checksum != checksum)
3067 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
3068 ftdi_error_return(-1,"EEPROM checksum error");
3071 eeprom->channel_a_type = 0;
3072 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM))
3076 else if (ftdi->type == TYPE_2232C)
3078 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3079 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3080 eeprom->high_current_a = buf[0x00] & HIGH_CURRENT_DRIVE;
3081 eeprom->channel_b_type = buf[0x01] & 0x7;
3082 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3083 eeprom->high_current_b = buf[0x01] & HIGH_CURRENT_DRIVE;
3084 eeprom->chip = buf[0x14];
3086 else if (ftdi->type == TYPE_R)
3088 /* TYPE_R flags D2XX, not VCP as all others*/
3089 eeprom->channel_a_driver = (~buf[0x00]) & DRIVER_VCP;
3090 eeprom->high_current = buf[0x00] & HIGH_CURRENT_DRIVE_R;
3091 if ( (buf[0x01]&0x40) != 0x40)
3093 "TYPE_R EEPROM byte[0x01] Bit 6 unexpected Endpoint size."
3094 " If this happened with the\n"
3095 " EEPROM programmed by FTDI tools, please report "
3096 "to libftdi@developer.intra2net.com\n");
3098 eeprom->chip = buf[0x16];
3099 // Addr 0B: Invert data lines
3100 // Works only on FT232R, not FT245R, but no way to distinguish
3101 eeprom->invert = buf[0x0B];
3102 // Addr 14: CBUS function: CBUS0, CBUS1
3103 // Addr 15: CBUS function: CBUS2, CBUS3
3104 // Addr 16: CBUS function: CBUS5
3105 eeprom->cbus_function[0] = buf[0x14] & 0x0f;
3106 eeprom->cbus_function[1] = (buf[0x14] >> 4) & 0x0f;
3107 eeprom->cbus_function[2] = buf[0x15] & 0x0f;
3108 eeprom->cbus_function[3] = (buf[0x15] >> 4) & 0x0f;
3109 eeprom->cbus_function[4] = buf[0x16] & 0x0f;
3111 else if ((ftdi->type == TYPE_2232H) ||(ftdi->type == TYPE_4232H))
3113 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3114 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3115 eeprom->channel_b_type = bit2type(buf[0x01] & 0x7);
3116 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3118 if (ftdi->type == TYPE_2232H)
3119 eeprom->suspend_dbus7 = buf[0x01] & SUSPEND_DBUS7_BIT;
3121 eeprom->chip = buf[0x18];
3122 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3123 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3124 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3125 eeprom->group1_drive = (buf[0x0c] >> 4) & 0x3;
3126 eeprom->group1_schmitt = (buf[0x0c] >> 4) & IS_SCHMITT;
3127 eeprom->group1_slew = (buf[0x0c] >> 4) & SLOW_SLEW;
3128 eeprom->group2_drive = buf[0x0d] & DRIVE_16MA;
3129 eeprom->group2_schmitt = buf[0x0d] & IS_SCHMITT;
3130 eeprom->group2_slew = buf[0x0d] & SLOW_SLEW;
3131 eeprom->group3_drive = (buf[0x0d] >> 4) & DRIVE_16MA;
3132 eeprom->group3_schmitt = (buf[0x0d] >> 4) & IS_SCHMITT;
3133 eeprom->group3_slew = (buf[0x0d] >> 4) & SLOW_SLEW;
3135 else if (ftdi->type == TYPE_232H)
3139 eeprom->channel_a_type = buf[0x00] & 0xf;
3140 eeprom->channel_a_driver = (buf[0x00] & DRIVER_VCPH)?DRIVER_VCP:0;
3141 eeprom->clock_polarity = buf[0x01] & FT1284_CLK_IDLE_STATE;
3142 eeprom->data_order = buf[0x01] & FT1284_DATA_LSB;
3143 eeprom->flow_control = buf[0x01] & FT1284_FLOW_CONTROL;
3144 eeprom->powersave = buf[0x01] & POWER_SAVE_DISABLE_H;
3145 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3146 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3147 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3148 eeprom->group1_drive = buf[0x0d] & DRIVE_16MA;
3149 eeprom->group1_schmitt = buf[0x0d] & IS_SCHMITT;
3150 eeprom->group1_slew = buf[0x0d] & SLOW_SLEW;
3154 eeprom->cbus_function[2*i ] = buf[0x18+i] & 0x0f;
3155 eeprom->cbus_function[2*i+1] = (buf[0x18+i] >> 4) & 0x0f;
3157 eeprom->chip = buf[0x1e];
3158 /*FIXME: Decipher more values*/
3163 char *channel_mode[] = {"UART", "FIFO", "CPU", "OPTO", "FT1284"};
3164 fprintf(stdout, "VID: 0x%04x\n",eeprom->vendor_id);
3165 fprintf(stdout, "PID: 0x%04x\n",eeprom->product_id);
3166 fprintf(stdout, "Release: 0x%04x\n",release);
3168 if (eeprom->self_powered)
3169 fprintf(stdout, "Self-Powered%s", (eeprom->remote_wakeup)?", USB Remote Wake Up\n":"\n");
3171 fprintf(stdout, "Bus Powered: %3d mA%s", eeprom->max_power * 2,
3172 (eeprom->remote_wakeup)?" USB Remote Wake Up\n":"\n");
3173 if (eeprom->manufacturer)
3174 fprintf(stdout, "Manufacturer: %s\n",eeprom->manufacturer);
3175 if (eeprom->product)
3176 fprintf(stdout, "Product: %s\n",eeprom->product);
3178 fprintf(stdout, "Serial: %s\n",eeprom->serial);
3179 fprintf(stdout, "Checksum : %04x\n", checksum);
3180 if (ftdi->type == TYPE_R)
3181 fprintf(stdout, "Internal EEPROM\n");
3182 else if (eeprom->chip >= 0x46)
3183 fprintf(stdout, "Attached EEPROM: 93x%02x\n", eeprom->chip);
3184 if (eeprom->suspend_dbus7)
3185 fprintf(stdout, "Suspend on DBUS7\n");
3186 if (eeprom->suspend_pull_downs)
3187 fprintf(stdout, "Pull IO pins low during suspend\n");
3188 if(eeprom->powersave)
3190 if(ftdi->type >= TYPE_232H)
3191 fprintf(stdout,"Enter low power state on ACBUS7\n");
3193 if (eeprom->remote_wakeup)
3194 fprintf(stdout, "Enable Remote Wake Up\n");
3195 fprintf(stdout, "PNP: %d\n",(eeprom->is_not_pnp)?0:1);
3196 if (ftdi->type >= TYPE_2232C)
3197 fprintf(stdout,"Channel A has Mode %s%s%s\n",
3198 channel_mode[eeprom->channel_a_type],
3199 (eeprom->channel_a_driver)?" VCP":"",
3200 (eeprom->high_current_a)?" High Current IO":"");
3201 if (ftdi->type >= TYPE_232H)
3203 fprintf(stdout,"FT1284 Mode Clock is idle %s, %s first, %sFlow Control\n",
3204 (eeprom->clock_polarity)?"HIGH":"LOW",
3205 (eeprom->data_order)?"LSB":"MSB",
3206 (eeprom->flow_control)?"":"No ");
3208 if ((ftdi->type >= TYPE_2232C) && (ftdi->type != TYPE_R) && (ftdi->type != TYPE_232H))
3209 fprintf(stdout,"Channel B has Mode %s%s%s\n",
3210 channel_mode[eeprom->channel_b_type],
3211 (eeprom->channel_b_driver)?" VCP":"",
3212 (eeprom->high_current_b)?" High Current IO":"");
3213 if (((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C)) &&
3214 eeprom->use_usb_version == USE_USB_VERSION_BIT)
3215 fprintf(stdout,"Use explicit USB Version %04x\n",eeprom->usb_version);
3217 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
3219 fprintf(stdout,"%s has %d mA drive%s%s\n",
3220 (ftdi->type == TYPE_2232H)?"AL":"A",
3221 (eeprom->group0_drive+1) *4,
3222 (eeprom->group0_schmitt)?" Schmitt Input":"",
3223 (eeprom->group0_slew)?" Slow Slew":"");
3224 fprintf(stdout,"%s has %d mA drive%s%s\n",
3225 (ftdi->type == TYPE_2232H)?"AH":"B",
3226 (eeprom->group1_drive+1) *4,
3227 (eeprom->group1_schmitt)?" Schmitt Input":"",
3228 (eeprom->group1_slew)?" Slow Slew":"");
3229 fprintf(stdout,"%s has %d mA drive%s%s\n",
3230 (ftdi->type == TYPE_2232H)?"BL":"C",
3231 (eeprom->group2_drive+1) *4,
3232 (eeprom->group2_schmitt)?" Schmitt Input":"",
3233 (eeprom->group2_slew)?" Slow Slew":"");
3234 fprintf(stdout,"%s has %d mA drive%s%s\n",
3235 (ftdi->type == TYPE_2232H)?"BH":"D",
3236 (eeprom->group3_drive+1) *4,
3237 (eeprom->group3_schmitt)?" Schmitt Input":"",
3238 (eeprom->group3_slew)?" Slow Slew":"");
3240 else if (ftdi->type == TYPE_232H)
3243 char *cbush_mux[] = {"TRISTATE","RXLED","TXLED", "TXRXLED","PWREN",
3244 "SLEEP","DRIVE_0","DRIVE_1","IOMODE","TXDEN",
3245 "CLK30","CLK15","CLK7_5"
3247 fprintf(stdout,"ACBUS has %d mA drive%s%s\n",
3248 (eeprom->group0_drive+1) *4,
3249 (eeprom->group0_schmitt)?" Schmitt Input":"",
3250 (eeprom->group0_slew)?" Slow Slew":"");
3251 fprintf(stdout,"ADBUS has %d mA drive%s%s\n",
3252 (eeprom->group1_drive+1) *4,
3253 (eeprom->group1_schmitt)?" Schmitt Input":"",
3254 (eeprom->group1_slew)?" Slow Slew":"");
3255 for (i=0; i<10; i++)
3257 if (eeprom->cbus_function[i]<= CBUSH_CLK7_5 )
3258 fprintf(stdout,"C%d Function: %s\n", i,
3259 cbush_mux[eeprom->cbus_function[i]]);
3264 if (ftdi->type == TYPE_R)
3266 char *cbus_mux[] = {"TXDEN","PWREN","RXLED", "TXLED","TX+RXLED",
3267 "SLEEP","CLK48","CLK24","CLK12","CLK6",
3268 "IOMODE","BB_WR","BB_RD"
3270 char *cbus_BB[] = {"RXF","TXE","RD", "WR"};
3274 char *r_bits[] = {"TXD","RXD","RTS", "CTS","DTR","DSR","DCD","RI"};
3275 fprintf(stdout,"Inverted bits:");
3277 if ((eeprom->invert & (1<<i)) == (1<<i))
3278 fprintf(stdout," %s",r_bits[i]);
3279 fprintf(stdout,"\n");
3283 if (eeprom->cbus_function[i]<CBUS_BB)
3284 fprintf(stdout,"C%d Function: %s\n", i,
3285 cbus_mux[eeprom->cbus_function[i]]);
3289 /* Running MPROG show that C0..3 have fixed function Synchronous
3291 fprintf(stdout,"C%d BB Function: %s\n", i,
3294 fprintf(stdout, "Unknown CBUS mode. Might be special mode?\n");
3303 Get a value from the decoded EEPROM structure
3305 \param ftdi pointer to ftdi_context
3306 \param value_name Enum of the value to query
3307 \param value Pointer to store read value
3310 \retval -1: Value doesn't exist
3312 int ftdi_get_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int* value)
3317 *value = ftdi->eeprom->vendor_id;
3320 *value = ftdi->eeprom->product_id;
3323 *value = ftdi->eeprom->self_powered;
3326 *value = ftdi->eeprom->remote_wakeup;
3329 *value = ftdi->eeprom->is_not_pnp;
3332 *value = ftdi->eeprom->suspend_dbus7;
3334 case IN_IS_ISOCHRONOUS:
3335 *value = ftdi->eeprom->in_is_isochronous;
3337 case OUT_IS_ISOCHRONOUS:
3338 *value = ftdi->eeprom->out_is_isochronous;
3340 case SUSPEND_PULL_DOWNS:
3341 *value = ftdi->eeprom->suspend_pull_downs;
3344 *value = ftdi->eeprom->use_serial;
3347 *value = ftdi->eeprom->usb_version;
3349 case USE_USB_VERSION:
3350 *value = ftdi->eeprom->use_usb_version;
3353 *value = ftdi->eeprom->max_power;
3355 case CHANNEL_A_TYPE:
3356 *value = ftdi->eeprom->channel_a_type;
3358 case CHANNEL_B_TYPE:
3359 *value = ftdi->eeprom->channel_b_type;
3361 case CHANNEL_A_DRIVER:
3362 *value = ftdi->eeprom->channel_a_driver;
3364 case CHANNEL_B_DRIVER:
3365 *value = ftdi->eeprom->channel_b_driver;
3367 case CBUS_FUNCTION_0:
3368 *value = ftdi->eeprom->cbus_function[0];
3370 case CBUS_FUNCTION_1:
3371 *value = ftdi->eeprom->cbus_function[1];
3373 case CBUS_FUNCTION_2:
3374 *value = ftdi->eeprom->cbus_function[2];
3376 case CBUS_FUNCTION_3:
3377 *value = ftdi->eeprom->cbus_function[3];
3379 case CBUS_FUNCTION_4:
3380 *value = ftdi->eeprom->cbus_function[4];
3382 case CBUS_FUNCTION_5:
3383 *value = ftdi->eeprom->cbus_function[5];
3385 case CBUS_FUNCTION_6:
3386 *value = ftdi->eeprom->cbus_function[6];
3388 case CBUS_FUNCTION_7:
3389 *value = ftdi->eeprom->cbus_function[7];
3391 case CBUS_FUNCTION_8:
3392 *value = ftdi->eeprom->cbus_function[8];
3394 case CBUS_FUNCTION_9:
3395 *value = ftdi->eeprom->cbus_function[8];
3398 *value = ftdi->eeprom->high_current;
3400 case HIGH_CURRENT_A:
3401 *value = ftdi->eeprom->high_current_a;
3403 case HIGH_CURRENT_B:
3404 *value = ftdi->eeprom->high_current_b;
3407 *value = ftdi->eeprom->invert;
3410 *value = ftdi->eeprom->group0_drive;
3412 case GROUP0_SCHMITT:
3413 *value = ftdi->eeprom->group0_schmitt;
3416 *value = ftdi->eeprom->group0_slew;
3419 *value = ftdi->eeprom->group1_drive;
3421 case GROUP1_SCHMITT:
3422 *value = ftdi->eeprom->group1_schmitt;
3425 *value = ftdi->eeprom->group1_slew;
3428 *value = ftdi->eeprom->group2_drive;
3430 case GROUP2_SCHMITT:
3431 *value = ftdi->eeprom->group2_schmitt;
3434 *value = ftdi->eeprom->group2_slew;
3437 *value = ftdi->eeprom->group3_drive;
3439 case GROUP3_SCHMITT:
3440 *value = ftdi->eeprom->group3_schmitt;
3443 *value = ftdi->eeprom->group3_slew;
3446 *value = ftdi->eeprom->powersave;
3448 case CLOCK_POLARITY:
3449 *value = ftdi->eeprom->clock_polarity;
3452 *value = ftdi->eeprom->data_order;
3455 *value = ftdi->eeprom->flow_control;
3458 *value = ftdi->eeprom->chip;
3461 *value = ftdi->eeprom->size;
3464 ftdi_error_return(-1, "Request for unknown EEPROM value");
3470 Set a value in the decoded EEPROM Structure
3471 No parameter checking is performed
3473 \param ftdi pointer to ftdi_context
3474 \param value_name Enum of the value to set
3478 \retval -1: Value doesn't exist
3479 \retval -2: Value not user settable
3481 int ftdi_set_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int value)
3486 ftdi->eeprom->vendor_id = value;
3489 ftdi->eeprom->product_id = value;
3492 ftdi->eeprom->self_powered = value;
3495 ftdi->eeprom->remote_wakeup = value;
3498 ftdi->eeprom->is_not_pnp = value;
3501 ftdi->eeprom->suspend_dbus7 = value;
3503 case IN_IS_ISOCHRONOUS:
3504 ftdi->eeprom->in_is_isochronous = value;
3506 case OUT_IS_ISOCHRONOUS:
3507 ftdi->eeprom->out_is_isochronous = value;
3509 case SUSPEND_PULL_DOWNS:
3510 ftdi->eeprom->suspend_pull_downs = value;
3513 ftdi->eeprom->use_serial = value;
3516 ftdi->eeprom->usb_version = value;
3518 case USE_USB_VERSION:
3519 ftdi->eeprom->use_usb_version = value;
3522 ftdi->eeprom->max_power = value;
3524 case CHANNEL_A_TYPE:
3525 ftdi->eeprom->channel_a_type = value;
3527 case CHANNEL_B_TYPE:
3528 ftdi->eeprom->channel_b_type = value;
3530 case CHANNEL_A_DRIVER:
3531 ftdi->eeprom->channel_a_driver = value;
3533 case CHANNEL_B_DRIVER:
3534 ftdi->eeprom->channel_b_driver = value;
3536 case CBUS_FUNCTION_0:
3537 ftdi->eeprom->cbus_function[0] = value;
3539 case CBUS_FUNCTION_1:
3540 ftdi->eeprom->cbus_function[1] = value;
3542 case CBUS_FUNCTION_2:
3543 ftdi->eeprom->cbus_function[2] = value;
3545 case CBUS_FUNCTION_3:
3546 ftdi->eeprom->cbus_function[3] = value;
3548 case CBUS_FUNCTION_4:
3549 ftdi->eeprom->cbus_function[4] = value;
3551 case CBUS_FUNCTION_5:
3552 ftdi->eeprom->cbus_function[5] = value;
3554 case CBUS_FUNCTION_6:
3555 ftdi->eeprom->cbus_function[6] = value;
3557 case CBUS_FUNCTION_7:
3558 ftdi->eeprom->cbus_function[7] = value;
3560 case CBUS_FUNCTION_8:
3561 ftdi->eeprom->cbus_function[8] = value;
3563 case CBUS_FUNCTION_9:
3564 ftdi->eeprom->cbus_function[9] = value;
3567 ftdi->eeprom->high_current = value;
3569 case HIGH_CURRENT_A:
3570 ftdi->eeprom->high_current_a = value;
3572 case HIGH_CURRENT_B:
3573 ftdi->eeprom->high_current_b = value;
3576 ftdi->eeprom->invert = value;
3579 ftdi->eeprom->group0_drive = value;
3581 case GROUP0_SCHMITT:
3582 ftdi->eeprom->group0_schmitt = value;
3585 ftdi->eeprom->group0_slew = value;
3588 ftdi->eeprom->group1_drive = value;
3590 case GROUP1_SCHMITT:
3591 ftdi->eeprom->group1_schmitt = value;
3594 ftdi->eeprom->group1_slew = value;
3597 ftdi->eeprom->group2_drive = value;
3599 case GROUP2_SCHMITT:
3600 ftdi->eeprom->group2_schmitt = value;
3603 ftdi->eeprom->group2_slew = value;
3606 ftdi->eeprom->group3_drive = value;
3608 case GROUP3_SCHMITT:
3609 ftdi->eeprom->group3_schmitt = value;
3612 ftdi->eeprom->group3_slew = value;
3615 ftdi->eeprom->chip = value;
3618 ftdi->eeprom->powersave = value;
3620 case CLOCK_POLARITY:
3621 ftdi->eeprom->clock_polarity = value;
3624 ftdi->eeprom->data_order = value;
3627 ftdi->eeprom->flow_control = value;
3630 ftdi_error_return(-2, "EEPROM Value can't be changed");
3632 ftdi_error_return(-1, "Request to unknown EEPROM value");
3637 /** Get the read-only buffer to the binary EEPROM content
3639 \param ftdi pointer to ftdi_context
3640 \param buf buffer to receive EEPROM content
3641 \param size Size of receiving buffer
3644 \retval -1: struct ftdi_contxt or ftdi_eeprom missing
3645 \retval -2: Not enough room to store eeprom
3647 int ftdi_get_eeprom_buf(struct ftdi_context *ftdi, unsigned char * buf, int size)
3649 if (!ftdi || !(ftdi->eeprom))
3650 ftdi_error_return(-1, "No appropriate structure");
3652 if (!buf || size < ftdi->eeprom->size)
3653 ftdi_error_return(-1, "Not enough room to store eeprom");
3655 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
3656 if (size > FTDI_MAX_EEPROM_SIZE)
3657 size = FTDI_MAX_EEPROM_SIZE;
3659 memcpy(buf, ftdi->eeprom->buf, size);
3664 /** Set the EEPROM content from the user-supplied prefilled buffer
3666 \param ftdi pointer to ftdi_context
3667 \param buf buffer to read EEPROM content
3668 \param size Size of buffer
3671 \retval -1: struct ftdi_contxt or ftdi_eeprom of buf missing
3673 int ftdi_set_eeprom_buf(struct ftdi_context *ftdi, const unsigned char * buf, int size)
3675 if (!ftdi || !(ftdi->eeprom) || !buf)
3676 ftdi_error_return(-1, "No appropriate structure");
3678 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
3679 if (size > FTDI_MAX_EEPROM_SIZE)
3680 size = FTDI_MAX_EEPROM_SIZE;
3682 memcpy(ftdi->eeprom->buf, buf, size);
3688 Read eeprom location
3690 \param ftdi pointer to ftdi_context
3691 \param eeprom_addr Address of eeprom location to be read
3692 \param eeprom_val Pointer to store read eeprom location
3695 \retval -1: read failed
3696 \retval -2: USB device unavailable
3698 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
3700 if (ftdi == NULL || ftdi->usb_dev == NULL)
3701 ftdi_error_return(-2, "USB device unavailable");
3703 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, eeprom_addr, (unsigned char *)eeprom_val, 2, ftdi->usb_read_timeout) != 2)
3704 ftdi_error_return(-1, "reading eeprom failed");
3712 \param ftdi pointer to ftdi_context
3715 \retval -1: read failed
3716 \retval -2: USB device unavailable
3718 int ftdi_read_eeprom(struct ftdi_context *ftdi)
3723 if (ftdi == NULL || ftdi->usb_dev == NULL)
3724 ftdi_error_return(-2, "USB device unavailable");
3725 buf = ftdi->eeprom->buf;
3727 for (i = 0; i < FTDI_MAX_EEPROM_SIZE/2; i++)
3729 if (libusb_control_transfer(
3730 ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,SIO_READ_EEPROM_REQUEST, 0, i,
3731 buf+(i*2), 2, ftdi->usb_read_timeout) != 2)
3732 ftdi_error_return(-1, "reading eeprom failed");
3735 if (ftdi->type == TYPE_R)
3736 ftdi->eeprom->size = 0x80;
3737 /* Guesses size of eeprom by comparing halves
3738 - will not work with blank eeprom */
3739 else if (strrchr((const char *)buf, 0xff) == ((const char *)buf +FTDI_MAX_EEPROM_SIZE -1))
3740 ftdi->eeprom->size = -1;
3741 else if (memcmp(buf,&buf[0x80],0x80) == 0)
3742 ftdi->eeprom->size = 0x80;
3743 else if (memcmp(buf,&buf[0x40],0x40) == 0)
3744 ftdi->eeprom->size = 0x40;
3746 ftdi->eeprom->size = 0x100;
3751 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
3752 Function is only used internally
3755 static unsigned char ftdi_read_chipid_shift(unsigned char value)
3757 return ((value & 1) << 1) |
3758 ((value & 2) << 5) |
3759 ((value & 4) >> 2) |
3760 ((value & 8) << 4) |
3761 ((value & 16) >> 1) |
3762 ((value & 32) >> 1) |
3763 ((value & 64) >> 4) |
3764 ((value & 128) >> 2);
3768 Read the FTDIChip-ID from R-type devices
3770 \param ftdi pointer to ftdi_context
3771 \param chipid Pointer to store FTDIChip-ID
3774 \retval -1: read failed
3775 \retval -2: USB device unavailable
3777 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
3779 unsigned int a = 0, b = 0;
3781 if (ftdi == NULL || ftdi->usb_dev == NULL)
3782 ftdi_error_return(-2, "USB device unavailable");
3784 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)
3786 a = a << 8 | a >> 8;
3787 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)
3789 b = b << 8 | b >> 8;
3790 a = (a << 16) | (b & 0xFFFF);
3791 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
3792 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
3793 *chipid = a ^ 0xa5f0f7d1;
3798 ftdi_error_return(-1, "read of FTDIChip-ID failed");
3802 Write eeprom location
3804 \param ftdi pointer to ftdi_context
3805 \param eeprom_addr Address of eeprom location to be written
3806 \param eeprom_val Value to be written
3809 \retval -1: write failed
3810 \retval -2: USB device unavailable
3811 \retval -3: Invalid access to checksum protected area below 0x80
3812 \retval -4: Device can't access unprotected area
3813 \retval -5: Reading chip type failed
3815 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr,
3816 unsigned short eeprom_val)
3818 int chip_type_location;
3819 unsigned short chip_type;
3821 if (ftdi == NULL || ftdi->usb_dev == NULL)
3822 ftdi_error_return(-2, "USB device unavailable");
3824 if (eeprom_addr <0x80)
3825 ftdi_error_return(-2, "Invalid access to checksum protected area below 0x80");
3832 chip_type_location = 0x14;
3836 chip_type_location = 0x18;
3839 chip_type_location = 0x1e;
3842 ftdi_error_return(-4, "Device can't access unprotected area");
3845 if (ftdi_read_eeprom_location( ftdi, chip_type_location>>1, &chip_type))
3846 ftdi_error_return(-5, "Reading failed failed");
3847 fprintf(stderr," loc 0x%04x val 0x%04x\n", chip_type_location,chip_type);
3848 if ((chip_type & 0xff) != 0x66)
3850 ftdi_error_return(-6, "EEPROM is not of 93x66");
3853 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3854 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
3855 NULL, 0, ftdi->usb_write_timeout) != 0)
3856 ftdi_error_return(-1, "unable to write eeprom");
3864 \param ftdi pointer to ftdi_context
3867 \retval -1: read failed
3868 \retval -2: USB device unavailable
3869 \retval -3: EEPROM not initialized for the connected device;
3871 int ftdi_write_eeprom(struct ftdi_context *ftdi)
3873 unsigned short usb_val, status;
3875 unsigned char *eeprom;
3877 if (ftdi == NULL || ftdi->usb_dev == NULL)
3878 ftdi_error_return(-2, "USB device unavailable");
3880 if(ftdi->eeprom->initialized_for_connected_device == 0)
3881 ftdi_error_return(-3, "EEPROM not initialized for the connected device");
3883 eeprom = ftdi->eeprom->buf;
3885 /* These commands were traced while running MProg */
3886 if ((ret = ftdi_usb_reset(ftdi)) != 0)
3888 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
3890 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
3893 for (i = 0; i < ftdi->eeprom->size/2; i++)
3895 usb_val = eeprom[i*2];
3896 usb_val += eeprom[(i*2)+1] << 8;
3897 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3898 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
3899 NULL, 0, ftdi->usb_write_timeout) < 0)
3900 ftdi_error_return(-1, "unable to write eeprom");
3909 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
3911 \param ftdi pointer to ftdi_context
3914 \retval -1: erase failed
3915 \retval -2: USB device unavailable
3916 \retval -3: Writing magic failed
3917 \retval -4: Read EEPROM failed
3918 \retval -5: Unexpected EEPROM value
3920 #define MAGIC 0x55aa
3921 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
3923 unsigned short eeprom_value;
3924 if (ftdi == NULL || ftdi->usb_dev == NULL)
3925 ftdi_error_return(-2, "USB device unavailable");
3927 if (ftdi->type == TYPE_R)
3929 ftdi->eeprom->chip = 0;
3933 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
3934 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
3935 ftdi_error_return(-1, "unable to erase eeprom");
3938 /* detect chip type by writing 0x55AA as magic at word position 0xc0
3939 Chip is 93x46 if magic is read at word position 0x00, as wraparound happens around 0x40
3940 Chip is 93x56 if magic is read at word position 0x40, as wraparound happens around 0x80
3941 Chip is 93x66 if magic is only read at word position 0xc0*/
3942 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3943 SIO_WRITE_EEPROM_REQUEST, MAGIC, 0xc0,
3944 NULL, 0, ftdi->usb_write_timeout) != 0)
3945 ftdi_error_return(-3, "Writing magic failed");
3946 if (ftdi_read_eeprom_location( ftdi, 0x00, &eeprom_value))
3947 ftdi_error_return(-4, "Reading failed failed");
3948 if (eeprom_value == MAGIC)
3950 ftdi->eeprom->chip = 0x46;
3954 if (ftdi_read_eeprom_location( ftdi, 0x40, &eeprom_value))
3955 ftdi_error_return(-4, "Reading failed failed");
3956 if (eeprom_value == MAGIC)
3957 ftdi->eeprom->chip = 0x56;
3960 if (ftdi_read_eeprom_location( ftdi, 0xc0, &eeprom_value))
3961 ftdi_error_return(-4, "Reading failed failed");
3962 if (eeprom_value == MAGIC)
3963 ftdi->eeprom->chip = 0x66;
3966 ftdi->eeprom->chip = -1;
3970 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
3971 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
3972 ftdi_error_return(-1, "unable to erase eeprom");
3977 Get string representation for last error code
3979 \param ftdi pointer to ftdi_context
3981 \retval Pointer to error string
3983 char *ftdi_get_error_string (struct ftdi_context *ftdi)
3988 return ftdi->error_str;
3991 /* @} end of doxygen libftdi group */