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 #define ftdi_error_return(code, str) do { \
40 ftdi->error_str = str; \
44 #define ftdi_error_return_free_device_list(code, str, devs) do { \
45 libusb_free_device_list(devs,1); \
46 ftdi->error_str = str; \
52 Internal function to close usb device pointer.
53 Sets ftdi->usb_dev to NULL.
56 \param ftdi pointer to ftdi_context
60 static void ftdi_usb_close_internal (struct ftdi_context *ftdi)
62 if (ftdi && ftdi->usb_dev)
64 libusb_close (ftdi->usb_dev);
67 ftdi->eeprom->initialized_for_connected_device = 0;
72 Initializes a ftdi_context.
74 \param ftdi pointer to ftdi_context
77 \retval -1: couldn't allocate read buffer
78 \retval -2: couldn't allocate struct buffer
79 \retval -3: libusb_init() failed
81 \remark This should be called before all functions
83 int ftdi_init(struct ftdi_context *ftdi)
85 struct ftdi_eeprom* eeprom = (struct ftdi_eeprom *)malloc(sizeof(struct ftdi_eeprom));
88 ftdi->usb_read_timeout = 5000;
89 ftdi->usb_write_timeout = 5000;
91 ftdi->type = TYPE_BM; /* chip type */
93 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
95 ftdi->readbuffer = NULL;
96 ftdi->readbuffer_offset = 0;
97 ftdi->readbuffer_remaining = 0;
98 ftdi->writebuffer_chunksize = 4096;
99 ftdi->max_packet_size = 0;
100 ftdi->error_str = NULL;
101 ftdi->module_detach_mode = AUTO_DETACH_SIO_MODULE;
103 if (libusb_init(&ftdi->usb_ctx) < 0)
104 ftdi_error_return(-3, "libusb_init() failed");
106 ftdi_set_interface(ftdi, INTERFACE_ANY);
107 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
110 ftdi_error_return(-2, "Can't malloc struct ftdi_eeprom");
111 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
112 ftdi->eeprom = eeprom;
114 /* All fine. Now allocate the readbuffer */
115 return ftdi_read_data_set_chunksize(ftdi, 4096);
119 Allocate and initialize a new ftdi_context
121 \return a pointer to a new ftdi_context, or NULL on failure
123 struct ftdi_context *ftdi_new(void)
125 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
132 if (ftdi_init(ftdi) != 0)
142 Open selected channels on a chip, otherwise use first channel.
144 \param ftdi pointer to ftdi_context
145 \param interface Interface to use for FT2232C/2232H/4232H chips.
148 \retval -1: unknown interface
149 \retval -2: USB device unavailable
151 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
154 ftdi_error_return(-2, "USB device unavailable");
161 ftdi->index = INTERFACE_A;
167 ftdi->index = INTERFACE_B;
173 ftdi->index = INTERFACE_C;
179 ftdi->index = INTERFACE_D;
184 ftdi_error_return(-1, "Unknown interface");
190 Deinitializes a ftdi_context.
192 \param ftdi pointer to ftdi_context
194 void ftdi_deinit(struct ftdi_context *ftdi)
199 ftdi_usb_close_internal (ftdi);
201 if (ftdi->readbuffer != NULL)
203 free(ftdi->readbuffer);
204 ftdi->readbuffer = NULL;
207 if (ftdi->eeprom != NULL)
209 if (ftdi->eeprom->manufacturer != 0)
211 free(ftdi->eeprom->manufacturer);
212 ftdi->eeprom->manufacturer = 0;
214 if (ftdi->eeprom->product != 0)
216 free(ftdi->eeprom->product);
217 ftdi->eeprom->product = 0;
219 if (ftdi->eeprom->serial != 0)
221 free(ftdi->eeprom->serial);
222 ftdi->eeprom->serial = 0;
230 libusb_exit(ftdi->usb_ctx);
231 ftdi->usb_ctx = NULL;
236 Deinitialize and free an ftdi_context.
238 \param ftdi pointer to ftdi_context
240 void ftdi_free(struct ftdi_context *ftdi)
247 Use an already open libusb device.
249 \param ftdi pointer to ftdi_context
250 \param usb libusb libusb_device_handle to use
252 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
262 Finds all ftdi devices with given VID:PID on the usb bus. Creates a new
263 ftdi_device_list which needs to be deallocated by ftdi_list_free() after
264 use. With VID:PID 0:0, search for the default devices
265 (0x403:0x6001, 0x403:0x6010, 0x403:0x6011, 0x403:0x6014)
267 \param ftdi pointer to ftdi_context
268 \param devlist Pointer where to store list of found devices
269 \param vendor Vendor ID to search for
270 \param product Product ID to search for
272 \retval >0: number of devices found
273 \retval -3: out of memory
274 \retval -5: libusb_get_device_list() failed
275 \retval -6: libusb_get_device_descriptor() failed
277 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
279 struct ftdi_device_list **curdev;
281 libusb_device **devs;
285 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
286 ftdi_error_return(-5, "libusb_get_device_list() failed");
291 while ((dev = devs[i++]) != NULL)
293 struct libusb_device_descriptor desc;
295 if (libusb_get_device_descriptor(dev, &desc) < 0)
296 ftdi_error_return_free_device_list(-6, "libusb_get_device_descriptor() failed", devs);
298 if (((vendor != 0 && product != 0) &&
299 desc.idVendor == vendor && desc.idProduct == product) ||
300 ((vendor == 0 && product == 0) &&
301 (desc.idVendor == 0x403) && (desc.idProduct == 0x6001 || desc.idProduct == 0x6010
302 || desc.idProduct == 0x6011 || desc.idProduct == 0x6014)))
304 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
306 ftdi_error_return_free_device_list(-3, "out of memory", devs);
308 (*curdev)->next = NULL;
309 (*curdev)->dev = dev;
310 libusb_ref_device(dev);
311 curdev = &(*curdev)->next;
315 libusb_free_device_list(devs,1);
320 Frees a usb device list.
322 \param devlist USB device list created by ftdi_usb_find_all()
324 void ftdi_list_free(struct ftdi_device_list **devlist)
326 struct ftdi_device_list *curdev, *next;
328 for (curdev = *devlist; curdev != NULL;)
331 libusb_unref_device(curdev->dev);
340 Frees a usb device list.
342 \param devlist USB device list created by ftdi_usb_find_all()
344 void ftdi_list_free2(struct ftdi_device_list *devlist)
346 ftdi_list_free(&devlist);
350 Return device ID strings from the usb device.
352 The parameters manufacturer, description and serial may be NULL
353 or pointer to buffers to store the fetched strings.
355 \note Use this function only in combination with ftdi_usb_find_all()
356 as it closes the internal "usb_dev" after use.
358 \param ftdi pointer to ftdi_context
359 \param dev libusb usb_dev to use
360 \param manufacturer Store manufacturer string here if not NULL
361 \param mnf_len Buffer size of manufacturer string
362 \param description Store product description string here if not NULL
363 \param desc_len Buffer size of product description string
364 \param serial Store serial string here if not NULL
365 \param serial_len Buffer size of serial string
368 \retval -1: wrong arguments
369 \retval -4: unable to open device
370 \retval -7: get product manufacturer failed
371 \retval -8: get product description failed
372 \retval -9: get serial number failed
373 \retval -11: libusb_get_device_descriptor() failed
375 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
376 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
378 struct libusb_device_descriptor desc;
380 if ((ftdi==NULL) || (dev==NULL))
383 if (libusb_open(dev, &ftdi->usb_dev) < 0)
384 ftdi_error_return(-4, "libusb_open() failed");
386 if (libusb_get_device_descriptor(dev, &desc) < 0)
387 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
389 if (manufacturer != NULL)
391 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
393 ftdi_usb_close_internal (ftdi);
394 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
398 if (description != NULL)
400 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
402 ftdi_usb_close_internal (ftdi);
403 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
409 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
411 ftdi_usb_close_internal (ftdi);
412 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
416 ftdi_usb_close_internal (ftdi);
422 * Internal function to determine the maximum packet size.
423 * \param ftdi pointer to ftdi_context
424 * \param dev libusb usb_dev to use
425 * \retval Maximum packet size for this device
427 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
429 struct libusb_device_descriptor desc;
430 struct libusb_config_descriptor *config0;
431 unsigned int packet_size;
434 if (ftdi == NULL || dev == NULL)
437 // Determine maximum packet size. Init with default value.
438 // New hi-speed devices from FTDI use a packet size of 512 bytes
439 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
440 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H )
445 if (libusb_get_device_descriptor(dev, &desc) < 0)
448 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
451 if (desc.bNumConfigurations > 0)
453 if (ftdi->interface < config0->bNumInterfaces)
455 struct libusb_interface interface = config0->interface[ftdi->interface];
456 if (interface.num_altsetting > 0)
458 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
459 if (descriptor.bNumEndpoints > 0)
461 packet_size = descriptor.endpoint[0].wMaxPacketSize;
467 libusb_free_config_descriptor (config0);
472 Opens a ftdi device given by an usb_device.
474 \param ftdi pointer to ftdi_context
475 \param dev libusb usb_dev to use
478 \retval -3: unable to config device
479 \retval -4: unable to open device
480 \retval -5: unable to claim device
481 \retval -6: reset failed
482 \retval -7: set baudrate failed
483 \retval -8: ftdi context invalid
484 \retval -9: libusb_get_device_descriptor() failed
485 \retval -10: libusb_get_config_descriptor() failed
486 \retval -11: libusb_detach_kernel_driver() failed
487 \retval -12: libusb_get_configuration() failed
489 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
491 struct libusb_device_descriptor desc;
492 struct libusb_config_descriptor *config0;
493 int cfg, cfg0, detach_errno = 0;
496 ftdi_error_return(-8, "ftdi context invalid");
498 if (libusb_open(dev, &ftdi->usb_dev) < 0)
499 ftdi_error_return(-4, "libusb_open() failed");
501 if (libusb_get_device_descriptor(dev, &desc) < 0)
502 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
504 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
505 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
506 cfg0 = config0->bConfigurationValue;
507 libusb_free_config_descriptor (config0);
509 // Try to detach ftdi_sio kernel module.
511 // The return code is kept in a separate variable and only parsed
512 // if usb_set_configuration() or usb_claim_interface() fails as the
513 // detach operation might be denied and everything still works fine.
514 // Likely scenario is a static ftdi_sio kernel module.
515 if (ftdi->module_detach_mode == AUTO_DETACH_SIO_MODULE)
517 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
518 detach_errno = errno;
521 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
522 ftdi_error_return(-12, "libusb_get_configuration () failed");
523 // set configuration (needed especially for windows)
524 // tolerate EBUSY: one device with one configuration, but two interfaces
525 // and libftdi sessions to both interfaces (e.g. FT2232)
526 if (desc.bNumConfigurations > 0 && cfg != cfg0)
528 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
530 ftdi_usb_close_internal (ftdi);
531 if (detach_errno == EPERM)
533 ftdi_error_return(-8, "inappropriate permissions on device!");
537 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
542 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
544 ftdi_usb_close_internal (ftdi);
545 if (detach_errno == EPERM)
547 ftdi_error_return(-8, "inappropriate permissions on device!");
551 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
555 if (ftdi_usb_reset (ftdi) != 0)
557 ftdi_usb_close_internal (ftdi);
558 ftdi_error_return(-6, "ftdi_usb_reset failed");
561 // Try to guess chip type
562 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
563 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
564 && desc.iSerialNumber == 0))
565 ftdi->type = TYPE_BM;
566 else if (desc.bcdDevice == 0x200)
567 ftdi->type = TYPE_AM;
568 else if (desc.bcdDevice == 0x500)
569 ftdi->type = TYPE_2232C;
570 else if (desc.bcdDevice == 0x600)
572 else if (desc.bcdDevice == 0x700)
573 ftdi->type = TYPE_2232H;
574 else if (desc.bcdDevice == 0x800)
575 ftdi->type = TYPE_4232H;
576 else if (desc.bcdDevice == 0x900)
577 ftdi->type = TYPE_232H;
579 // Determine maximum packet size
580 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
582 if (ftdi_set_baudrate (ftdi, 9600) != 0)
584 ftdi_usb_close_internal (ftdi);
585 ftdi_error_return(-7, "set baudrate failed");
588 ftdi_error_return(0, "all fine");
592 Opens the first device with a given vendor and product ids.
594 \param ftdi pointer to ftdi_context
595 \param vendor Vendor ID
596 \param product Product ID
598 \retval same as ftdi_usb_open_desc()
600 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
602 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
606 Opens the first device with a given, vendor id, product id,
607 description and serial.
609 \param ftdi pointer to ftdi_context
610 \param vendor Vendor ID
611 \param product Product ID
612 \param description Description to search for. Use NULL if not needed.
613 \param serial Serial to search for. Use NULL if not needed.
616 \retval -3: usb device not found
617 \retval -4: unable to open device
618 \retval -5: unable to claim device
619 \retval -6: reset failed
620 \retval -7: set baudrate failed
621 \retval -8: get product description failed
622 \retval -9: get serial number failed
623 \retval -12: libusb_get_device_list() failed
624 \retval -13: libusb_get_device_descriptor() failed
626 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
627 const char* description, const char* serial)
629 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
633 Opens the index-th device with a given, vendor id, product id,
634 description and serial.
636 \param ftdi pointer to ftdi_context
637 \param vendor Vendor ID
638 \param product Product ID
639 \param description Description to search for. Use NULL if not needed.
640 \param serial Serial to search for. Use NULL if not needed.
641 \param index Number of matching device to open if there are more than one, starts with 0.
644 \retval -1: usb_find_busses() failed
645 \retval -2: usb_find_devices() failed
646 \retval -3: usb device not found
647 \retval -4: unable to open device
648 \retval -5: unable to claim device
649 \retval -6: reset failed
650 \retval -7: set baudrate failed
651 \retval -8: get product description failed
652 \retval -9: get serial number failed
653 \retval -10: unable to close device
654 \retval -11: ftdi context invalid
656 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
657 const char* description, const char* serial, unsigned int index)
660 libusb_device **devs;
665 ftdi_error_return(-11, "ftdi context invalid");
667 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
668 ftdi_error_return(-12, "libusb_get_device_list() failed");
670 while ((dev = devs[i++]) != NULL)
672 struct libusb_device_descriptor desc;
675 if (libusb_get_device_descriptor(dev, &desc) < 0)
676 ftdi_error_return_free_device_list(-13, "libusb_get_device_descriptor() failed", devs);
678 if (desc.idVendor == vendor && desc.idProduct == product)
680 if (libusb_open(dev, &ftdi->usb_dev) < 0)
681 ftdi_error_return_free_device_list(-4, "usb_open() failed", devs);
683 if (description != NULL)
685 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
687 ftdi_usb_close_internal (ftdi);
688 ftdi_error_return_free_device_list(-8, "unable to fetch product description", devs);
690 if (strncmp(string, description, sizeof(string)) != 0)
692 ftdi_usb_close_internal (ftdi);
698 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
700 ftdi_usb_close_internal (ftdi);
701 ftdi_error_return_free_device_list(-9, "unable to fetch serial number", devs);
703 if (strncmp(string, serial, sizeof(string)) != 0)
705 ftdi_usb_close_internal (ftdi);
710 ftdi_usb_close_internal (ftdi);
718 res = ftdi_usb_open_dev(ftdi, dev);
719 libusb_free_device_list(devs,1);
725 ftdi_error_return_free_device_list(-3, "device not found", devs);
729 Opens the ftdi-device described by a description-string.
730 Intended to be used for parsing a device-description given as commandline argument.
732 \param ftdi pointer to ftdi_context
733 \param description NULL-terminated description-string, using this format:
734 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
735 \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")
736 \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
737 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
739 \note The description format may be extended in later versions.
742 \retval -2: libusb_get_device_list() failed
743 \retval -3: usb device not found
744 \retval -4: unable to open device
745 \retval -5: unable to claim device
746 \retval -6: reset failed
747 \retval -7: set baudrate failed
748 \retval -8: get product description failed
749 \retval -9: get serial number failed
750 \retval -10: unable to close device
751 \retval -11: illegal description format
752 \retval -12: ftdi context invalid
754 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
757 ftdi_error_return(-12, "ftdi context invalid");
759 if (description[0] == 0 || description[1] != ':')
760 ftdi_error_return(-11, "illegal description format");
762 if (description[0] == 'd')
765 libusb_device **devs;
766 unsigned int bus_number, device_address;
769 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
770 ftdi_error_return(-2, "libusb_get_device_list() failed");
772 /* XXX: This doesn't handle symlinks/odd paths/etc... */
773 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
774 ftdi_error_return_free_device_list(-11, "illegal description format", devs);
776 while ((dev = devs[i++]) != NULL)
779 if (bus_number == libusb_get_bus_number (dev)
780 && device_address == libusb_get_device_address (dev))
782 ret = ftdi_usb_open_dev(ftdi, dev);
783 libusb_free_device_list(devs,1);
789 ftdi_error_return_free_device_list(-3, "device not found", devs);
791 else if (description[0] == 'i' || description[0] == 's')
794 unsigned int product;
795 unsigned int index=0;
796 const char *serial=NULL;
797 const char *startp, *endp;
800 startp=description+2;
801 vendor=strtoul((char*)startp,(char**)&endp,0);
802 if (*endp != ':' || endp == startp || errno != 0)
803 ftdi_error_return(-11, "illegal description format");
806 product=strtoul((char*)startp,(char**)&endp,0);
807 if (endp == startp || errno != 0)
808 ftdi_error_return(-11, "illegal description format");
810 if (description[0] == 'i' && *endp != 0)
812 /* optional index field in i-mode */
814 ftdi_error_return(-11, "illegal description format");
817 index=strtoul((char*)startp,(char**)&endp,0);
818 if (*endp != 0 || endp == startp || errno != 0)
819 ftdi_error_return(-11, "illegal description format");
821 if (description[0] == 's')
824 ftdi_error_return(-11, "illegal description format");
826 /* rest of the description is the serial */
830 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
834 ftdi_error_return(-11, "illegal description format");
839 Resets the ftdi device.
841 \param ftdi pointer to ftdi_context
844 \retval -1: FTDI reset failed
845 \retval -2: USB device unavailable
847 int ftdi_usb_reset(struct ftdi_context *ftdi)
849 if (ftdi == NULL || ftdi->usb_dev == NULL)
850 ftdi_error_return(-2, "USB device unavailable");
852 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
853 SIO_RESET_REQUEST, SIO_RESET_SIO,
854 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
855 ftdi_error_return(-1,"FTDI reset failed");
857 // Invalidate data in the readbuffer
858 ftdi->readbuffer_offset = 0;
859 ftdi->readbuffer_remaining = 0;
865 Clears the read buffer on the chip and the internal read buffer.
867 \param ftdi pointer to ftdi_context
870 \retval -1: read buffer purge failed
871 \retval -2: USB device unavailable
873 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
875 if (ftdi == NULL || ftdi->usb_dev == NULL)
876 ftdi_error_return(-2, "USB device unavailable");
878 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
879 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
880 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
881 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
883 // Invalidate data in the readbuffer
884 ftdi->readbuffer_offset = 0;
885 ftdi->readbuffer_remaining = 0;
891 Clears the write buffer on the chip.
893 \param ftdi pointer to ftdi_context
896 \retval -1: write buffer purge failed
897 \retval -2: USB device unavailable
899 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
901 if (ftdi == NULL || ftdi->usb_dev == NULL)
902 ftdi_error_return(-2, "USB device unavailable");
904 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
905 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
906 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
907 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
913 Clears the buffers on the chip and the internal read buffer.
915 \param ftdi pointer to ftdi_context
918 \retval -1: read buffer purge failed
919 \retval -2: write buffer purge failed
920 \retval -3: USB device unavailable
922 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
926 if (ftdi == NULL || ftdi->usb_dev == NULL)
927 ftdi_error_return(-3, "USB device unavailable");
929 result = ftdi_usb_purge_rx_buffer(ftdi);
933 result = ftdi_usb_purge_tx_buffer(ftdi);
943 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
945 \param ftdi pointer to ftdi_context
948 \retval -1: usb_release failed
949 \retval -3: ftdi context invalid
951 int ftdi_usb_close(struct ftdi_context *ftdi)
956 ftdi_error_return(-3, "ftdi context invalid");
958 if (ftdi->usb_dev != NULL)
959 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
962 ftdi_usb_close_internal (ftdi);
967 /* ftdi_to_clkbits_AM For the AM device, convert a requested baudrate
968 to encoded divisor and the achievable baudrate
969 Function is only used internally
976 From /2, 0.125/ 0.25 and 0.5 steps may be taken
977 The fractional part has frac_code encoding
979 static int ftdi_to_clkbits_AM(int baudrate, unsigned long *encoded_divisor)
982 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
983 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
984 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
985 int divisor, best_divisor, best_baud, best_baud_diff;
986 divisor = 24000000 / baudrate;
989 // Round down to supported fraction (AM only)
990 divisor -= am_adjust_dn[divisor & 7];
992 // Try this divisor and the one above it (because division rounds down)
996 for (i = 0; i < 2; i++)
998 int try_divisor = divisor + i;
1002 // Round up to supported divisor value
1003 if (try_divisor <= 8)
1005 // Round up to minimum supported divisor
1008 else if (divisor < 16)
1010 // AM doesn't support divisors 9 through 15 inclusive
1015 // Round up to supported fraction (AM only)
1016 try_divisor += am_adjust_up[try_divisor & 7];
1017 if (try_divisor > 0x1FFF8)
1019 // Round down to maximum supported divisor value (for AM)
1020 try_divisor = 0x1FFF8;
1023 // Get estimated baud rate (to nearest integer)
1024 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1025 // Get absolute difference from requested baud rate
1026 if (baud_estimate < baudrate)
1028 baud_diff = baudrate - baud_estimate;
1032 baud_diff = baud_estimate - baudrate;
1034 if (i == 0 || baud_diff < best_baud_diff)
1036 // Closest to requested baud rate so far
1037 best_divisor = try_divisor;
1038 best_baud = baud_estimate;
1039 best_baud_diff = baud_diff;
1042 // Spot on! No point trying
1047 // Encode the best divisor value
1048 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1049 // Deal with special cases for encoded value
1050 if (*encoded_divisor == 1)
1052 *encoded_divisor = 0; // 3000000 baud
1054 else if (*encoded_divisor == 0x4001)
1056 *encoded_divisor = 1; // 2000000 baud (BM only)
1061 /* ftdi_to_clkbits Convert a requested baudrate for a given system clock and predivisor
1062 to encoded divisor and the achievable baudrate
1063 Function is only used internally
1070 From /2, 0.125 steps may be taken.
1071 The fractional part has frac_code encoding
1073 value[13:0] of value is the divisor
1074 index[9] mean 12 MHz Base(120 MHz/10) rate versus 3 MHz (48 MHz/16) else
1076 H Type have all features above with
1077 {index[8],value[15:14]} is the encoded subdivisor
1079 FT232R, FT2232 and FT232BM have no option for 12 MHz and with
1080 {index[0],value[15:14]} is the encoded subdivisor
1082 AM Type chips have only four fractional subdivisors at value[15:14]
1083 for subdivisors 0, 0.5, 0.25, 0.125
1085 static int ftdi_to_clkbits(int baudrate, unsigned int clk, int clk_div, unsigned long *encoded_divisor)
1087 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1089 int divisor, best_divisor;
1090 if (baudrate >= clk/clk_div)
1092 *encoded_divisor = 0;
1093 best_baud = clk/clk_div;
1095 else if (baudrate >= clk/(clk_div + clk_div/2))
1097 *encoded_divisor = 1;
1098 best_baud = clk/(clk_div + clk_div/2);
1100 else if (baudrate >= clk/(2*clk_div))
1102 *encoded_divisor = 2;
1103 best_baud = clk/(2*clk_div);
1107 /* We divide by 16 to have 3 fractional bits and one bit for rounding */
1108 divisor = clk*16/clk_div / baudrate;
1109 if (divisor & 1) /* Decide if to round up or down*/
1110 best_divisor = divisor /2 +1;
1112 best_divisor = divisor/2;
1113 if(best_divisor > 0x20000)
1114 best_divisor = 0x1ffff;
1115 best_baud = clk*8/clk_div/best_divisor;
1116 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 0x7] << 14);
1121 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
1122 Function is only used internally
1125 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
1126 unsigned short *value, unsigned short *index)
1129 unsigned long encoded_divisor;
1137 #define H_CLK 120000000
1138 #define C_CLK 48000000
1139 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H) || (ftdi->type == TYPE_232H ))
1141 if(baudrate*10 > H_CLK /0x3fff)
1143 /* On H Devices, use 12 000 000 Baudrate when possible
1144 We have a 14 bit divisor, a 1 bit divisor switch (10 or 16)
1145 three fractional bits and a 120 MHz clock
1146 Assume AN_120 "Sub-integer divisors between 0 and 2 are not allowed" holds for
1147 DIV/10 CLK too, so /1, /1.5 and /2 can be handled the same*/
1148 best_baud = ftdi_to_clkbits(baudrate, H_CLK, 10, &encoded_divisor);
1149 encoded_divisor |= 0x20000; /* switch on CLK/10*/
1152 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1154 else if ((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C) || (ftdi->type == TYPE_R ))
1156 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1160 best_baud = ftdi_to_clkbits_AM(baudrate, &encoded_divisor);
1162 // Split into "value" and "index" values
1163 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1164 if (ftdi->type == TYPE_2232H ||
1165 ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H )
1167 *index = (unsigned short)(encoded_divisor >> 8);
1169 *index |= ftdi->index;
1172 *index = (unsigned short)(encoded_divisor >> 16);
1174 // Return the nearest baud rate
1179 * @brief Wrapper function to export ftdi_convert_baudrate() to the unit test
1180 * Do not use, it's only for the unit test framework
1182 int convert_baudrate_UT_export(int baudrate, struct ftdi_context *ftdi,
1183 unsigned short *value, unsigned short *index)
1185 return ftdi_convert_baudrate(baudrate, ftdi, value, index);
1189 Sets the chip baud rate
1191 \param ftdi pointer to ftdi_context
1192 \param baudrate baud rate to set
1195 \retval -1: invalid baudrate
1196 \retval -2: setting baudrate failed
1197 \retval -3: USB device unavailable
1199 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1201 unsigned short value, index;
1202 int actual_baudrate;
1204 if (ftdi == NULL || ftdi->usb_dev == NULL)
1205 ftdi_error_return(-3, "USB device unavailable");
1207 if (ftdi->bitbang_enabled)
1209 baudrate = baudrate*4;
1212 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1213 if (actual_baudrate <= 0)
1214 ftdi_error_return (-1, "Silly baudrate <= 0.");
1216 // Check within tolerance (about 5%)
1217 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1218 || ((actual_baudrate < baudrate)
1219 ? (actual_baudrate * 21 < baudrate * 20)
1220 : (baudrate * 21 < actual_baudrate * 20)))
1221 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1223 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1224 SIO_SET_BAUDRATE_REQUEST, value,
1225 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1226 ftdi_error_return (-2, "Setting new baudrate failed");
1228 ftdi->baudrate = baudrate;
1233 Set (RS232) line characteristics.
1234 The break type can only be set via ftdi_set_line_property2()
1235 and defaults to "off".
1237 \param ftdi pointer to ftdi_context
1238 \param bits Number of bits
1239 \param sbit Number of stop bits
1240 \param parity Parity mode
1243 \retval -1: Setting line property failed
1245 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1246 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1248 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1252 Set (RS232) line characteristics
1254 \param ftdi pointer to ftdi_context
1255 \param bits Number of bits
1256 \param sbit Number of stop bits
1257 \param parity Parity mode
1258 \param break_type Break type
1261 \retval -1: Setting line property failed
1262 \retval -2: USB device unavailable
1264 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1265 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1266 enum ftdi_break_type break_type)
1268 unsigned short value = bits;
1270 if (ftdi == NULL || ftdi->usb_dev == NULL)
1271 ftdi_error_return(-2, "USB device unavailable");
1276 value |= (0x00 << 8);
1279 value |= (0x01 << 8);
1282 value |= (0x02 << 8);
1285 value |= (0x03 << 8);
1288 value |= (0x04 << 8);
1295 value |= (0x00 << 11);
1298 value |= (0x01 << 11);
1301 value |= (0x02 << 11);
1308 value |= (0x00 << 14);
1311 value |= (0x01 << 14);
1315 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1316 SIO_SET_DATA_REQUEST, value,
1317 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1318 ftdi_error_return (-1, "Setting new line property failed");
1324 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1326 \param ftdi pointer to ftdi_context
1327 \param buf Buffer with the data
1328 \param size Size of the buffer
1330 \retval -666: USB device unavailable
1331 \retval <0: error code from usb_bulk_write()
1332 \retval >0: number of bytes written
1334 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1339 if (ftdi == NULL || ftdi->usb_dev == NULL)
1340 ftdi_error_return(-666, "USB device unavailable");
1342 while (offset < size)
1344 int write_size = ftdi->writebuffer_chunksize;
1346 if (offset+write_size > size)
1347 write_size = size-offset;
1349 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1350 ftdi_error_return(-1, "usb bulk write failed");
1352 offset += actual_length;
1358 static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1360 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1361 struct ftdi_context *ftdi = tc->ftdi;
1362 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1364 packet_size = ftdi->max_packet_size;
1366 actual_length = transfer->actual_length;
1368 if (actual_length > 2)
1370 // skip FTDI status bytes.
1371 // Maybe stored in the future to enable modem use
1372 num_of_chunks = actual_length / packet_size;
1373 chunk_remains = actual_length % packet_size;
1374 //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);
1376 ftdi->readbuffer_offset += 2;
1379 if (actual_length > packet_size - 2)
1381 for (i = 1; i < num_of_chunks; i++)
1382 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1383 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1385 if (chunk_remains > 2)
1387 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1388 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1390 actual_length -= 2*num_of_chunks;
1393 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1396 if (actual_length > 0)
1398 // data still fits in buf?
1399 if (tc->offset + actual_length <= tc->size)
1401 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1402 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1403 tc->offset += actual_length;
1405 ftdi->readbuffer_offset = 0;
1406 ftdi->readbuffer_remaining = 0;
1408 /* Did we read exactly the right amount of bytes? */
1409 if (tc->offset == tc->size)
1411 //printf("read_data exact rem %d offset %d\n",
1412 //ftdi->readbuffer_remaining, offset);
1419 // only copy part of the data or size <= readbuffer_chunksize
1420 int part_size = tc->size - tc->offset;
1421 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1422 tc->offset += part_size;
1424 ftdi->readbuffer_offset += part_size;
1425 ftdi->readbuffer_remaining = actual_length - part_size;
1427 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1428 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1434 ret = libusb_submit_transfer (transfer);
1440 static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1442 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1443 struct ftdi_context *ftdi = tc->ftdi;
1445 tc->offset += transfer->actual_length;
1447 if (tc->offset == tc->size)
1453 int write_size = ftdi->writebuffer_chunksize;
1456 if (tc->offset + write_size > tc->size)
1457 write_size = tc->size - tc->offset;
1459 transfer->length = write_size;
1460 transfer->buffer = tc->buf + tc->offset;
1461 ret = libusb_submit_transfer (transfer);
1469 Writes data to the chip. Does not wait for completion of the transfer
1470 nor does it make sure that the transfer was successful.
1472 Use libusb 1.0 asynchronous API.
1474 \param ftdi pointer to ftdi_context
1475 \param buf Buffer with the data
1476 \param size Size of the buffer
1478 \retval NULL: Some error happens when submit transfer
1479 \retval !NULL: Pointer to a ftdi_transfer_control
1482 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1484 struct ftdi_transfer_control *tc;
1485 struct libusb_transfer *transfer;
1486 int write_size, ret;
1488 if (ftdi == NULL || ftdi->usb_dev == NULL)
1491 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1495 transfer = libusb_alloc_transfer(0);
1508 if (size < ftdi->writebuffer_chunksize)
1511 write_size = ftdi->writebuffer_chunksize;
1513 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf,
1514 write_size, ftdi_write_data_cb, tc,
1515 ftdi->usb_write_timeout);
1516 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1518 ret = libusb_submit_transfer(transfer);
1521 libusb_free_transfer(transfer);
1525 tc->transfer = transfer;
1531 Reads data from the chip. Does not wait for completion of the transfer
1532 nor does it make sure that the transfer was successful.
1534 Use libusb 1.0 asynchronous API.
1536 \param ftdi pointer to ftdi_context
1537 \param buf Buffer with the data
1538 \param size Size of the buffer
1540 \retval NULL: Some error happens when submit transfer
1541 \retval !NULL: Pointer to a ftdi_transfer_control
1544 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1546 struct ftdi_transfer_control *tc;
1547 struct libusb_transfer *transfer;
1550 if (ftdi == NULL || ftdi->usb_dev == NULL)
1553 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1561 if (size <= ftdi->readbuffer_remaining)
1563 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1566 ftdi->readbuffer_remaining -= size;
1567 ftdi->readbuffer_offset += size;
1569 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1573 tc->transfer = NULL;
1578 if (ftdi->readbuffer_remaining != 0)
1580 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1582 tc->offset = ftdi->readbuffer_remaining;
1587 transfer = libusb_alloc_transfer(0);
1594 ftdi->readbuffer_remaining = 0;
1595 ftdi->readbuffer_offset = 0;
1597 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);
1598 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1600 ret = libusb_submit_transfer(transfer);
1603 libusb_free_transfer(transfer);
1607 tc->transfer = transfer;
1613 Wait for completion of the transfer.
1615 Use libusb 1.0 asynchronous API.
1617 \param tc pointer to ftdi_transfer_control
1619 \retval < 0: Some error happens
1620 \retval >= 0: Data size transferred
1623 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1627 while (!tc->completed)
1629 ret = libusb_handle_events(tc->ftdi->usb_ctx);
1632 if (ret == LIBUSB_ERROR_INTERRUPTED)
1634 libusb_cancel_transfer(tc->transfer);
1635 while (!tc->completed)
1636 if (libusb_handle_events(tc->ftdi->usb_ctx) < 0)
1638 libusb_free_transfer(tc->transfer);
1646 * tc->transfer could be NULL if "(size <= ftdi->readbuffer_remaining)"
1647 * at ftdi_read_data_submit(). Therefore, we need to check it here.
1651 if (tc->transfer->status != LIBUSB_TRANSFER_COMPLETED)
1653 libusb_free_transfer(tc->transfer);
1660 Configure write buffer chunk size.
1663 \param ftdi pointer to ftdi_context
1664 \param chunksize Chunk size
1667 \retval -1: ftdi context invalid
1669 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1672 ftdi_error_return(-1, "ftdi context invalid");
1674 ftdi->writebuffer_chunksize = chunksize;
1679 Get write buffer chunk size.
1681 \param ftdi pointer to ftdi_context
1682 \param chunksize Pointer to store chunk size in
1685 \retval -1: ftdi context invalid
1687 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1690 ftdi_error_return(-1, "ftdi context invalid");
1692 *chunksize = ftdi->writebuffer_chunksize;
1697 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1699 Automatically strips the two modem status bytes transfered during every read.
1701 \param ftdi pointer to ftdi_context
1702 \param buf Buffer to store data in
1703 \param size Size of the buffer
1705 \retval -666: USB device unavailable
1706 \retval <0: error code from libusb_bulk_transfer()
1707 \retval 0: no data was available
1708 \retval >0: number of bytes read
1711 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1713 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1714 int packet_size = ftdi->max_packet_size;
1715 int actual_length = 1;
1717 if (ftdi == NULL || ftdi->usb_dev == NULL)
1718 ftdi_error_return(-666, "USB device unavailable");
1720 // Packet size sanity check (avoid division by zero)
1721 if (packet_size == 0)
1722 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1724 // everything we want is still in the readbuffer?
1725 if (size <= ftdi->readbuffer_remaining)
1727 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1730 ftdi->readbuffer_remaining -= size;
1731 ftdi->readbuffer_offset += size;
1733 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1737 // something still in the readbuffer, but not enough to satisfy 'size'?
1738 if (ftdi->readbuffer_remaining != 0)
1740 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1743 offset += ftdi->readbuffer_remaining;
1745 // do the actual USB read
1746 while (offset < size && actual_length > 0)
1748 ftdi->readbuffer_remaining = 0;
1749 ftdi->readbuffer_offset = 0;
1750 /* returns how much received */
1751 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1753 ftdi_error_return(ret, "usb bulk read failed");
1755 if (actual_length > 2)
1757 // skip FTDI status bytes.
1758 // Maybe stored in the future to enable modem use
1759 num_of_chunks = actual_length / packet_size;
1760 chunk_remains = actual_length % packet_size;
1761 //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);
1763 ftdi->readbuffer_offset += 2;
1766 if (actual_length > packet_size - 2)
1768 for (i = 1; i < num_of_chunks; i++)
1769 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1770 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1772 if (chunk_remains > 2)
1774 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1775 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1777 actual_length -= 2*num_of_chunks;
1780 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1783 else if (actual_length <= 2)
1785 // no more data to read?
1788 if (actual_length > 0)
1790 // data still fits in buf?
1791 if (offset+actual_length <= size)
1793 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1794 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1795 offset += actual_length;
1797 /* Did we read exactly the right amount of bytes? */
1799 //printf("read_data exact rem %d offset %d\n",
1800 //ftdi->readbuffer_remaining, offset);
1805 // only copy part of the data or size <= readbuffer_chunksize
1806 int part_size = size-offset;
1807 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1809 ftdi->readbuffer_offset += part_size;
1810 ftdi->readbuffer_remaining = actual_length-part_size;
1811 offset += part_size;
1813 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1814 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1825 Configure read buffer chunk size.
1828 Automatically reallocates the buffer.
1830 \param ftdi pointer to ftdi_context
1831 \param chunksize Chunk size
1834 \retval -1: ftdi context invalid
1836 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1838 unsigned char *new_buf;
1841 ftdi_error_return(-1, "ftdi context invalid");
1843 // Invalidate all remaining data
1844 ftdi->readbuffer_offset = 0;
1845 ftdi->readbuffer_remaining = 0;
1847 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1848 which is defined in libusb-1.0. Otherwise, each USB read request will
1849 be divided into multiple URBs. This will cause issues on Linux kernel
1850 older than 2.6.32. */
1851 if (chunksize > 16384)
1855 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1856 ftdi_error_return(-1, "out of memory for readbuffer");
1858 ftdi->readbuffer = new_buf;
1859 ftdi->readbuffer_chunksize = chunksize;
1865 Get read buffer chunk size.
1867 \param ftdi pointer to ftdi_context
1868 \param chunksize Pointer to store chunk size in
1871 \retval -1: FTDI context invalid
1873 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1876 ftdi_error_return(-1, "FTDI context invalid");
1878 *chunksize = ftdi->readbuffer_chunksize;
1884 Enable bitbang mode.
1886 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1888 \param ftdi pointer to ftdi_context
1889 \param bitmask Bitmask to configure lines.
1890 HIGH/ON value configures a line as output.
1893 \retval -1: can't enable bitbang mode
1894 \retval -2: USB device unavailable
1896 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1898 unsigned short usb_val;
1900 if (ftdi == NULL || ftdi->usb_dev == NULL)
1901 ftdi_error_return(-2, "USB device unavailable");
1903 usb_val = bitmask; // low byte: bitmask
1904 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1905 usb_val |= (ftdi->bitbang_mode << 8);
1907 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1908 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1909 NULL, 0, ftdi->usb_write_timeout) < 0)
1910 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1912 ftdi->bitbang_enabled = 1;
1917 Disable bitbang mode.
1919 \param ftdi pointer to ftdi_context
1922 \retval -1: can't disable bitbang mode
1923 \retval -2: USB device unavailable
1925 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1927 if (ftdi == NULL || ftdi->usb_dev == NULL)
1928 ftdi_error_return(-2, "USB device unavailable");
1930 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)
1931 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1933 ftdi->bitbang_enabled = 0;
1938 Enable/disable bitbang modes.
1940 \param ftdi pointer to ftdi_context
1941 \param bitmask Bitmask to configure lines.
1942 HIGH/ON value configures a line as output.
1943 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1946 \retval -1: can't enable bitbang mode
1947 \retval -2: USB device unavailable
1949 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1951 unsigned short usb_val;
1953 if (ftdi == NULL || ftdi->usb_dev == NULL)
1954 ftdi_error_return(-2, "USB device unavailable");
1956 usb_val = bitmask; // low byte: bitmask
1957 usb_val |= (mode << 8);
1958 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)
1959 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?");
1961 ftdi->bitbang_mode = mode;
1962 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1967 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1969 \param ftdi pointer to ftdi_context
1970 \param pins Pointer to store pins into
1973 \retval -1: read pins failed
1974 \retval -2: USB device unavailable
1976 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1978 if (ftdi == NULL || ftdi->usb_dev == NULL)
1979 ftdi_error_return(-2, "USB device unavailable");
1981 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)
1982 ftdi_error_return(-1, "read pins failed");
1990 The FTDI chip keeps data in the internal buffer for a specific
1991 amount of time if the buffer is not full yet to decrease
1992 load on the usb bus.
1994 \param ftdi pointer to ftdi_context
1995 \param latency Value between 1 and 255
1998 \retval -1: latency out of range
1999 \retval -2: unable to set latency timer
2000 \retval -3: USB device unavailable
2002 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
2004 unsigned short usb_val;
2007 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
2009 if (ftdi == NULL || ftdi->usb_dev == NULL)
2010 ftdi_error_return(-3, "USB device unavailable");
2013 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)
2014 ftdi_error_return(-2, "unable to set latency timer");
2022 \param ftdi pointer to ftdi_context
2023 \param latency Pointer to store latency value in
2026 \retval -1: unable to get latency timer
2027 \retval -2: USB device unavailable
2029 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
2031 unsigned short usb_val;
2033 if (ftdi == NULL || ftdi->usb_dev == NULL)
2034 ftdi_error_return(-2, "USB device unavailable");
2036 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)
2037 ftdi_error_return(-1, "reading latency timer failed");
2039 *latency = (unsigned char)usb_val;
2044 Poll modem status information
2046 This function allows the retrieve the two status bytes of the device.
2047 The device sends these bytes also as a header for each read access
2048 where they are discarded by ftdi_read_data(). The chip generates
2049 the two stripped status bytes in the absence of data every 40 ms.
2051 Layout of the first byte:
2052 - B0..B3 - must be 0
2053 - B4 Clear to send (CTS)
2056 - B5 Data set ready (DTS)
2059 - B6 Ring indicator (RI)
2062 - B7 Receive line signal detect (RLSD)
2066 Layout of the second byte:
2067 - B0 Data ready (DR)
2068 - B1 Overrun error (OE)
2069 - B2 Parity error (PE)
2070 - B3 Framing error (FE)
2071 - B4 Break interrupt (BI)
2072 - B5 Transmitter holding register (THRE)
2073 - B6 Transmitter empty (TEMT)
2074 - B7 Error in RCVR FIFO
2076 \param ftdi pointer to ftdi_context
2077 \param status Pointer to store status information in. Must be two bytes.
2080 \retval -1: unable to retrieve status information
2081 \retval -2: USB device unavailable
2083 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
2087 if (ftdi == NULL || ftdi->usb_dev == NULL)
2088 ftdi_error_return(-2, "USB device unavailable");
2090 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)
2091 ftdi_error_return(-1, "getting modem status failed");
2093 *status = (usb_val[1] << 8) | (usb_val[0] & 0xFF);
2099 Set flowcontrol for ftdi chip
2101 \param ftdi pointer to ftdi_context
2102 \param flowctrl flow control to use. should be
2103 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
2106 \retval -1: set flow control failed
2107 \retval -2: USB device unavailable
2109 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
2111 if (ftdi == NULL || ftdi->usb_dev == NULL)
2112 ftdi_error_return(-2, "USB device unavailable");
2114 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2115 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
2116 NULL, 0, ftdi->usb_write_timeout) < 0)
2117 ftdi_error_return(-1, "set flow control failed");
2125 \param ftdi pointer to ftdi_context
2126 \param state state to set line to (1 or 0)
2129 \retval -1: set dtr failed
2130 \retval -2: USB device unavailable
2132 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2134 unsigned short usb_val;
2136 if (ftdi == NULL || ftdi->usb_dev == NULL)
2137 ftdi_error_return(-2, "USB device unavailable");
2140 usb_val = SIO_SET_DTR_HIGH;
2142 usb_val = SIO_SET_DTR_LOW;
2144 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2145 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2146 NULL, 0, ftdi->usb_write_timeout) < 0)
2147 ftdi_error_return(-1, "set dtr failed");
2155 \param ftdi pointer to ftdi_context
2156 \param state state to set line to (1 or 0)
2159 \retval -1: set rts failed
2160 \retval -2: USB device unavailable
2162 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2164 unsigned short usb_val;
2166 if (ftdi == NULL || ftdi->usb_dev == NULL)
2167 ftdi_error_return(-2, "USB device unavailable");
2170 usb_val = SIO_SET_RTS_HIGH;
2172 usb_val = SIO_SET_RTS_LOW;
2174 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2175 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2176 NULL, 0, ftdi->usb_write_timeout) < 0)
2177 ftdi_error_return(-1, "set of rts failed");
2183 Set dtr and rts line in one pass
2185 \param ftdi pointer to ftdi_context
2186 \param dtr DTR state to set line to (1 or 0)
2187 \param rts RTS state to set line to (1 or 0)
2190 \retval -1: set dtr/rts failed
2191 \retval -2: USB device unavailable
2193 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2195 unsigned short usb_val;
2197 if (ftdi == NULL || ftdi->usb_dev == NULL)
2198 ftdi_error_return(-2, "USB device unavailable");
2201 usb_val = SIO_SET_DTR_HIGH;
2203 usb_val = SIO_SET_DTR_LOW;
2206 usb_val |= SIO_SET_RTS_HIGH;
2208 usb_val |= SIO_SET_RTS_LOW;
2210 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2211 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2212 NULL, 0, ftdi->usb_write_timeout) < 0)
2213 ftdi_error_return(-1, "set of rts/dtr failed");
2219 Set the special event character
2221 \param ftdi pointer to ftdi_context
2222 \param eventch Event character
2223 \param enable 0 to disable the event character, non-zero otherwise
2226 \retval -1: unable to set event character
2227 \retval -2: USB device unavailable
2229 int ftdi_set_event_char(struct ftdi_context *ftdi,
2230 unsigned char eventch, unsigned char enable)
2232 unsigned short usb_val;
2234 if (ftdi == NULL || ftdi->usb_dev == NULL)
2235 ftdi_error_return(-2, "USB device unavailable");
2241 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)
2242 ftdi_error_return(-1, "setting event character failed");
2250 \param ftdi pointer to ftdi_context
2251 \param errorch Error character
2252 \param enable 0 to disable the error character, non-zero otherwise
2255 \retval -1: unable to set error character
2256 \retval -2: USB device unavailable
2258 int ftdi_set_error_char(struct ftdi_context *ftdi,
2259 unsigned char errorch, unsigned char enable)
2261 unsigned short usb_val;
2263 if (ftdi == NULL || ftdi->usb_dev == NULL)
2264 ftdi_error_return(-2, "USB device unavailable");
2270 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)
2271 ftdi_error_return(-1, "setting error character failed");
2277 Init eeprom with default values for the connected device
2278 \param ftdi pointer to ftdi_context
2279 \param manufacturer String to use as Manufacturer
2280 \param product String to use as Product description
2281 \param serial String to use as Serial number description
2284 \retval -1: No struct ftdi_context
2285 \retval -2: No struct ftdi_eeprom
2286 \retval -3: No connected device or device not yet opened
2288 int ftdi_eeprom_initdefaults(struct ftdi_context *ftdi, char * manufacturer,
2289 char * product, char * serial)
2291 struct ftdi_eeprom *eeprom;
2294 ftdi_error_return(-1, "No struct ftdi_context");
2296 if (ftdi->eeprom == NULL)
2297 ftdi_error_return(-2,"No struct ftdi_eeprom");
2299 eeprom = ftdi->eeprom;
2300 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2302 if (ftdi->usb_dev == NULL)
2303 ftdi_error_return(-3, "No connected device or device not yet opened");
2305 eeprom->vendor_id = 0x0403;
2306 eeprom->use_serial = 1;
2307 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM) ||
2308 (ftdi->type == TYPE_R))
2309 eeprom->product_id = 0x6001;
2310 else if (ftdi->type == TYPE_4232H)
2311 eeprom->product_id = 0x6011;
2312 else if (ftdi->type == TYPE_232H)
2313 eeprom->product_id = 0x6014;
2315 eeprom->product_id = 0x6010;
2316 if (ftdi->type == TYPE_AM)
2317 eeprom->usb_version = 0x0101;
2319 eeprom->usb_version = 0x0200;
2320 eeprom->max_power = 100;
2322 if (eeprom->manufacturer)
2323 free (eeprom->manufacturer);
2324 eeprom->manufacturer = NULL;
2327 eeprom->manufacturer = malloc(strlen(manufacturer)+1);
2328 if (eeprom->manufacturer)
2329 strcpy(eeprom->manufacturer, manufacturer);
2332 if (eeprom->product)
2333 free (eeprom->product);
2334 eeprom->product = NULL;
2337 eeprom->product = malloc(strlen(product)+1);
2338 if (eeprom->product)
2339 strcpy(eeprom->product, product);
2343 const char* default_product;
2346 case TYPE_AM: default_product = "AM"; break;
2347 case TYPE_BM: default_product = "BM"; break;
2348 case TYPE_2232C: default_product = "Dual RS232"; break;
2349 case TYPE_R: default_product = "FT232R USB UART"; break;
2350 case TYPE_2232H: default_product = "Dual RS232-HS"; break;
2351 case TYPE_4232H: default_product = "FT4232H"; break;
2352 case TYPE_232H: default_product = "Single-RS232-HS"; break;
2354 ftdi_error_return(-3, "Unknown chip type");
2356 eeprom->product = malloc(strlen(default_product) +1);
2357 if (eeprom->product)
2358 strcpy(eeprom->product, default_product);
2362 free (eeprom->serial);
2363 eeprom->serial = NULL;
2366 eeprom->serial = malloc(strlen(serial)+1);
2368 strcpy(eeprom->serial, serial);
2372 if (ftdi->type == TYPE_R)
2374 eeprom->max_power = 90;
2375 eeprom->size = 0x80;
2376 eeprom->cbus_function[0] = CBUS_TXLED;
2377 eeprom->cbus_function[1] = CBUS_RXLED;
2378 eeprom->cbus_function[2] = CBUS_TXDEN;
2379 eeprom->cbus_function[3] = CBUS_PWREN;
2380 eeprom->cbus_function[4] = CBUS_SLEEP;
2384 if(ftdi->type == TYPE_232H)
2387 for (i=0; i<10; i++)
2388 eeprom->cbus_function[i] = CBUSH_TRISTATE;
2392 eeprom->initialized_for_connected_device = 1;
2395 /*FTD2XX doesn't check for values not fitting in the ACBUS Signal oprtions*/
2396 void set_ft232h_cbus(struct ftdi_eeprom *eeprom, unsigned char * output)
2401 int mode_low, mode_high;
2402 if (eeprom->cbus_function[2*i]> CBUSH_CLK7_5)
2403 mode_low = CBUSH_TRISTATE;
2405 mode_low = eeprom->cbus_function[2*i];
2406 if (eeprom->cbus_function[2*i+1]> CBUSH_CLK7_5)
2407 mode_high = CBUSH_TRISTATE;
2409 mode_high = eeprom->cbus_function[2*i];
2411 output[0x18+i] = mode_high <<4 | mode_low;
2414 /* Return the bits for the encoded EEPROM Structure of a requested Mode
2417 static unsigned char type2bit(unsigned char type, enum ftdi_chip_type chip)
2426 case CHANNEL_IS_UART: return 0;
2427 case CHANNEL_IS_FIFO: return 0x01;
2428 case CHANNEL_IS_OPTO: return 0x02;
2429 case CHANNEL_IS_CPU : return 0x04;
2437 case CHANNEL_IS_UART : return 0;
2438 case CHANNEL_IS_FIFO : return 0x01;
2439 case CHANNEL_IS_OPTO : return 0x02;
2440 case CHANNEL_IS_CPU : return 0x04;
2441 case CHANNEL_IS_FT1284 : return 0x08;
2451 Build binary buffer from ftdi_eeprom structure.
2452 Output is suitable for ftdi_write_eeprom().
2454 \param ftdi pointer to ftdi_context
2456 \retval >=0: size of eeprom user area in bytes
2457 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2458 \retval -2: Invalid eeprom or ftdi pointer
2459 \retval -3: Invalid cbus function setting (FIXME: Not in the code?)
2460 \retval -4: Chip doesn't support invert (FIXME: Not in the code?)
2461 \retval -5: Chip doesn't support high current drive (FIXME: Not in the code?)
2462 \retval -6: No connected EEPROM or EEPROM Type unknown
2464 int ftdi_eeprom_build(struct ftdi_context *ftdi)
2466 unsigned char i, j, eeprom_size_mask;
2467 unsigned short checksum, value;
2468 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2470 struct ftdi_eeprom *eeprom;
2471 unsigned char * output;
2474 ftdi_error_return(-2,"No context");
2475 if (ftdi->eeprom == NULL)
2476 ftdi_error_return(-2,"No eeprom structure");
2478 eeprom= ftdi->eeprom;
2479 output = eeprom->buf;
2481 if (eeprom->chip == -1)
2482 ftdi_error_return(-6,"No connected EEPROM or EEPROM type unknown");
2484 if ((eeprom->chip == 0x56) || (eeprom->chip == 0x66))
2485 eeprom->size = 0x100;
2487 eeprom->size = 0x80;
2489 if (eeprom->manufacturer != NULL)
2490 manufacturer_size = strlen(eeprom->manufacturer);
2491 if (eeprom->product != NULL)
2492 product_size = strlen(eeprom->product);
2493 if (eeprom->serial != NULL)
2494 serial_size = strlen(eeprom->serial);
2496 // eeprom size check
2501 user_area_size = 96; // base size for strings (total of 48 characters)
2504 user_area_size = 90; // two extra config bytes and 4 bytes PnP stuff
2507 user_area_size = 88; // four extra config bytes + 4 bytes PnP stuff
2509 case TYPE_2232H: // six extra config bytes + 4 bytes PnP stuff
2511 user_area_size = 86;
2514 user_area_size = 80;
2520 user_area_size -= (manufacturer_size + product_size + serial_size) * 2;
2522 if (user_area_size < 0)
2523 ftdi_error_return(-1,"eeprom size exceeded");
2526 memset (ftdi->eeprom->buf, 0, FTDI_MAX_EEPROM_SIZE);
2528 // Bytes and Bits set for all Types
2530 // Addr 02: Vendor ID
2531 output[0x02] = eeprom->vendor_id;
2532 output[0x03] = eeprom->vendor_id >> 8;
2534 // Addr 04: Product ID
2535 output[0x04] = eeprom->product_id;
2536 output[0x05] = eeprom->product_id >> 8;
2538 // Addr 06: Device release number (0400h for BM features)
2539 output[0x06] = 0x00;
2543 output[0x07] = 0x02;
2546 output[0x07] = 0x04;
2549 output[0x07] = 0x05;
2552 output[0x07] = 0x06;
2555 output[0x07] = 0x07;
2558 output[0x07] = 0x08;
2561 output[0x07] = 0x09;
2564 output[0x07] = 0x00;
2567 // Addr 08: Config descriptor
2569 // Bit 6: 1 if this device is self powered, 0 if bus powered
2570 // Bit 5: 1 if this device uses remote wakeup
2571 // Bit 4-0: reserved - 0
2573 if (eeprom->self_powered == 1)
2575 if (eeprom->remote_wakeup == 1)
2579 // Addr 09: Max power consumption: max power = value * 2 mA
2580 output[0x09] = eeprom->max_power>>1;
2582 if (ftdi->type != TYPE_AM)
2584 // Addr 0A: Chip configuration
2585 // Bit 7: 0 - reserved
2586 // Bit 6: 0 - reserved
2587 // Bit 5: 0 - reserved
2588 // Bit 4: 1 - Change USB version
2589 // Bit 3: 1 - Use the serial number string
2590 // Bit 2: 1 - Enable suspend pull downs for lower power
2591 // Bit 1: 1 - Out EndPoint is Isochronous
2592 // Bit 0: 1 - In EndPoint is Isochronous
2595 if (eeprom->in_is_isochronous == 1)
2597 if (eeprom->out_is_isochronous == 1)
2603 // Strings start at 0x94 (TYPE_AM, TYPE_BM)
2604 // 0x96 (TYPE_2232C), 0x98 (TYPE_R) and 0x9a (TYPE_x232H)
2622 /* Wrap around 0x80 for 128 byte EEPROMS (Internale and 93x46) */
2623 eeprom_size_mask = eeprom->size -1;
2625 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2626 // Addr 0F: Length of manufacturer string
2627 // Output manufacturer
2628 output[0x0E] = i; // calculate offset
2629 output[i & eeprom_size_mask] = manufacturer_size*2 + 2, i++;
2630 output[i & eeprom_size_mask] = 0x03, i++; // type: string
2631 for (j = 0; j < manufacturer_size; j++)
2633 output[i & eeprom_size_mask] = eeprom->manufacturer[j], i++;
2634 output[i & eeprom_size_mask] = 0x00, i++;
2636 output[0x0F] = manufacturer_size*2 + 2;
2638 // Addr 10: Offset of the product string + 0x80, calculated later
2639 // Addr 11: Length of product string
2640 output[0x10] = i | 0x80; // calculate offset
2641 output[i & eeprom_size_mask] = product_size*2 + 2, i++;
2642 output[i & eeprom_size_mask] = 0x03, i++;
2643 for (j = 0; j < product_size; j++)
2645 output[i & eeprom_size_mask] = eeprom->product[j], i++;
2646 output[i & eeprom_size_mask] = 0x00, i++;
2648 output[0x11] = product_size*2 + 2;
2650 // Addr 12: Offset of the serial string + 0x80, calculated later
2651 // Addr 13: Length of serial string
2652 output[0x12] = i | 0x80; // calculate offset
2653 output[i & eeprom_size_mask] = serial_size*2 + 2, i++;
2654 output[i & eeprom_size_mask] = 0x03, i++;
2655 for (j = 0; j < serial_size; j++)
2657 output[i & eeprom_size_mask] = eeprom->serial[j], i++;
2658 output[i & eeprom_size_mask] = 0x00, i++;
2661 // Legacy port name and PnP fields for FT2232 and newer chips
2662 if (ftdi->type > TYPE_BM)
2664 output[i & eeprom_size_mask] = 0x02; /* as seen when written with FTD2XX */
2666 output[i & eeprom_size_mask] = 0x03; /* as seen when written with FTD2XX */
2668 output[i & eeprom_size_mask] = eeprom->is_not_pnp; /* as seen when written with FTD2XX */
2672 output[0x13] = serial_size*2 + 2;
2674 if (ftdi->type > TYPE_AM) /* use_serial not used in AM devices */
2676 if (eeprom->use_serial)
2677 output[0x0A] |= USE_SERIAL_NUM;
2679 output[0x0A] &= ~USE_SERIAL_NUM;
2682 /* Bytes and Bits specific to (some) types
2683 Write linear, as this allows easier fixing*/
2689 output[0x0C] = eeprom->usb_version & 0xff;
2690 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2691 if (eeprom->use_usb_version == USE_USB_VERSION_BIT)
2692 output[0x0A] |= USE_USB_VERSION_BIT;
2694 output[0x0A] &= ~USE_USB_VERSION_BIT;
2699 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232C);
2700 if ( eeprom->channel_a_driver == DRIVER_VCP)
2701 output[0x00] |= DRIVER_VCP;
2703 output[0x00] &= ~DRIVER_VCP;
2705 if ( eeprom->high_current_a == HIGH_CURRENT_DRIVE)
2706 output[0x00] |= HIGH_CURRENT_DRIVE;
2708 output[0x00] &= ~HIGH_CURRENT_DRIVE;
2710 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232C);
2711 if ( eeprom->channel_b_driver == DRIVER_VCP)
2712 output[0x01] |= DRIVER_VCP;
2714 output[0x01] &= ~DRIVER_VCP;
2716 if ( eeprom->high_current_b == HIGH_CURRENT_DRIVE)
2717 output[0x01] |= HIGH_CURRENT_DRIVE;
2719 output[0x01] &= ~HIGH_CURRENT_DRIVE;
2721 if (eeprom->in_is_isochronous == 1)
2722 output[0x0A] |= 0x1;
2724 output[0x0A] &= ~0x1;
2725 if (eeprom->out_is_isochronous == 1)
2726 output[0x0A] |= 0x2;
2728 output[0x0A] &= ~0x2;
2729 if (eeprom->suspend_pull_downs == 1)
2730 output[0x0A] |= 0x4;
2732 output[0x0A] &= ~0x4;
2733 if (eeprom->use_usb_version == USE_USB_VERSION_BIT)
2734 output[0x0A] |= USE_USB_VERSION_BIT;
2736 output[0x0A] &= ~USE_USB_VERSION_BIT;
2738 output[0x0C] = eeprom->usb_version & 0xff;
2739 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2740 output[0x14] = eeprom->chip;
2743 if (eeprom->high_current == HIGH_CURRENT_DRIVE_R)
2744 output[0x00] |= HIGH_CURRENT_DRIVE_R;
2745 output[0x01] = 0x40; /* Hard coded Endpoint Size*/
2747 if (eeprom->suspend_pull_downs == 1)
2748 output[0x0A] |= 0x4;
2750 output[0x0A] &= ~0x4;
2751 output[0x0B] = eeprom->invert;
2752 output[0x0C] = eeprom->usb_version & 0xff;
2753 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2755 if (eeprom->cbus_function[0] > CBUS_BB)
2756 output[0x14] = CBUS_TXLED;
2758 output[0x14] = eeprom->cbus_function[0];
2760 if (eeprom->cbus_function[1] > CBUS_BB)
2761 output[0x14] |= CBUS_RXLED<<4;
2763 output[0x14] |= eeprom->cbus_function[1]<<4;
2765 if (eeprom->cbus_function[2] > CBUS_BB)
2766 output[0x15] = CBUS_TXDEN;
2768 output[0x15] = eeprom->cbus_function[2];
2770 if (eeprom->cbus_function[3] > CBUS_BB)
2771 output[0x15] |= CBUS_PWREN<<4;
2773 output[0x15] |= eeprom->cbus_function[3]<<4;
2775 if (eeprom->cbus_function[4] > CBUS_CLK6)
2776 output[0x16] = CBUS_SLEEP;
2778 output[0x16] = eeprom->cbus_function[4];
2781 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232H);
2782 if ( eeprom->channel_a_driver == DRIVER_VCP)
2783 output[0x00] |= DRIVER_VCP;
2785 output[0x00] &= ~DRIVER_VCP;
2787 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232H);
2788 if ( eeprom->channel_b_driver == DRIVER_VCP)
2789 output[0x01] |= DRIVER_VCP;
2791 output[0x01] &= ~DRIVER_VCP;
2792 if (eeprom->suspend_dbus7 == SUSPEND_DBUS7_BIT)
2793 output[0x01] |= SUSPEND_DBUS7_BIT;
2795 output[0x01] &= ~SUSPEND_DBUS7_BIT;
2797 if (eeprom->suspend_pull_downs == 1)
2798 output[0x0A] |= 0x4;
2800 output[0x0A] &= ~0x4;
2802 if (eeprom->group0_drive > DRIVE_16MA)
2803 output[0x0c] |= DRIVE_16MA;
2805 output[0x0c] |= eeprom->group0_drive;
2806 if (eeprom->group0_schmitt == IS_SCHMITT)
2807 output[0x0c] |= IS_SCHMITT;
2808 if (eeprom->group0_slew == SLOW_SLEW)
2809 output[0x0c] |= SLOW_SLEW;
2811 if (eeprom->group1_drive > DRIVE_16MA)
2812 output[0x0c] |= DRIVE_16MA<<4;
2814 output[0x0c] |= eeprom->group1_drive<<4;
2815 if (eeprom->group1_schmitt == IS_SCHMITT)
2816 output[0x0c] |= IS_SCHMITT<<4;
2817 if (eeprom->group1_slew == SLOW_SLEW)
2818 output[0x0c] |= SLOW_SLEW<<4;
2820 if (eeprom->group2_drive > DRIVE_16MA)
2821 output[0x0d] |= DRIVE_16MA;
2823 output[0x0d] |= eeprom->group2_drive;
2824 if (eeprom->group2_schmitt == IS_SCHMITT)
2825 output[0x0d] |= IS_SCHMITT;
2826 if (eeprom->group2_slew == SLOW_SLEW)
2827 output[0x0d] |= SLOW_SLEW;
2829 if (eeprom->group3_drive > DRIVE_16MA)
2830 output[0x0d] |= DRIVE_16MA<<4;
2832 output[0x0d] |= eeprom->group3_drive<<4;
2833 if (eeprom->group3_schmitt == IS_SCHMITT)
2834 output[0x0d] |= IS_SCHMITT<<4;
2835 if (eeprom->group3_slew == SLOW_SLEW)
2836 output[0x0d] |= SLOW_SLEW<<4;
2838 output[0x18] = eeprom->chip;
2842 output[0x18] = eeprom->chip;
2843 fprintf(stderr,"FIXME: Build FT4232H specific EEPROM settings\n");
2846 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_232H);
2847 if ( eeprom->channel_a_driver == DRIVER_VCP)
2848 output[0x00] |= DRIVER_VCPH;
2850 output[0x00] &= ~DRIVER_VCPH;
2851 if (eeprom->powersave)
2852 output[0x01] |= POWER_SAVE_DISABLE_H;
2854 output[0x01] &= ~POWER_SAVE_DISABLE_H;
2855 if (eeprom->clock_polarity)
2856 output[0x01] |= FT1284_CLK_IDLE_STATE;
2858 output[0x01] &= ~FT1284_CLK_IDLE_STATE;
2859 if (eeprom->data_order)
2860 output[0x01] |= FT1284_DATA_LSB;
2862 output[0x01] &= ~FT1284_DATA_LSB;
2863 if (eeprom->flow_control)
2864 output[0x01] |= FT1284_FLOW_CONTROL;
2866 output[0x01] &= ~FT1284_FLOW_CONTROL;
2867 if (eeprom->group0_drive > DRIVE_16MA)
2868 output[0x0c] |= DRIVE_16MA;
2870 output[0x0c] |= eeprom->group0_drive;
2871 if (eeprom->group0_schmitt == IS_SCHMITT)
2872 output[0x0c] |= IS_SCHMITT;
2873 if (eeprom->group0_slew == SLOW_SLEW)
2874 output[0x0c] |= SLOW_SLEW;
2876 if (eeprom->group1_drive > DRIVE_16MA)
2877 output[0x0d] |= DRIVE_16MA;
2879 output[0x0d] |= eeprom->group1_drive;
2880 if (eeprom->group1_schmitt == IS_SCHMITT)
2881 output[0x0d] |= IS_SCHMITT;
2882 if (eeprom->group1_slew == SLOW_SLEW)
2883 output[0x0d] |= SLOW_SLEW;
2885 set_ft232h_cbus(eeprom, output);
2887 output[0x1e] = eeprom->chip;
2888 fprintf(stderr,"FIXME: Build FT232H specific EEPROM settings\n");
2893 // calculate checksum
2896 for (i = 0; i < eeprom->size/2-1; i++)
2898 value = output[i*2];
2899 value += output[(i*2)+1] << 8;
2901 checksum = value^checksum;
2902 checksum = (checksum << 1) | (checksum >> 15);
2905 output[eeprom->size-2] = checksum;
2906 output[eeprom->size-1] = checksum >> 8;
2908 return user_area_size;
2910 /* Decode the encoded EEPROM field for the FTDI Mode into a value for the abstracted
2913 * FTD2XX doesn't allow to set multiple bits in the interface mode bitfield, and so do we
2915 static unsigned char bit2type(unsigned char bits)
2919 case 0: return CHANNEL_IS_UART;
2920 case 1: return CHANNEL_IS_FIFO;
2921 case 2: return CHANNEL_IS_OPTO;
2922 case 4: return CHANNEL_IS_CPU;
2923 case 8: return CHANNEL_IS_FT1284;
2925 fprintf(stderr," Unexpected value %d for Hardware Interface type\n",
2931 Decode binary EEPROM image into an ftdi_eeprom structure.
2933 \param ftdi pointer to ftdi_context
2934 \param verbose Decode EEPROM on stdout
2937 \retval -1: something went wrong
2939 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2940 FIXME: Strings are malloc'ed here and should be freed somewhere
2942 int ftdi_eeprom_decode(struct ftdi_context *ftdi, int verbose)
2945 unsigned short checksum, eeprom_checksum, value;
2946 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2948 struct ftdi_eeprom *eeprom;
2949 unsigned char *buf = ftdi->eeprom->buf;
2953 ftdi_error_return(-1,"No context");
2954 if (ftdi->eeprom == NULL)
2955 ftdi_error_return(-1,"No eeprom structure");
2957 eeprom = ftdi->eeprom;
2958 eeprom_size = eeprom->size;
2960 // Addr 02: Vendor ID
2961 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2963 // Addr 04: Product ID
2964 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2966 release = buf[0x06] + (buf[0x07]<<8);
2968 // Addr 08: Config descriptor
2970 // Bit 6: 1 if this device is self powered, 0 if bus powered
2971 // Bit 5: 1 if this device uses remote wakeup
2972 eeprom->self_powered = buf[0x08] & 0x40;
2973 eeprom->remote_wakeup = buf[0x08] & 0x20;
2975 // Addr 09: Max power consumption: max power = value * 2 mA
2976 eeprom->max_power = buf[0x09];
2978 // Addr 0A: Chip configuration
2979 // Bit 7: 0 - reserved
2980 // Bit 6: 0 - reserved
2981 // Bit 5: 0 - reserved
2982 // Bit 4: 1 - Change USB version on BM and 2232C
2983 // Bit 3: 1 - Use the serial number string
2984 // Bit 2: 1 - Enable suspend pull downs for lower power
2985 // Bit 1: 1 - Out EndPoint is Isochronous
2986 // Bit 0: 1 - In EndPoint is Isochronous
2988 eeprom->in_is_isochronous = buf[0x0A]&0x01;
2989 eeprom->out_is_isochronous = buf[0x0A]&0x02;
2990 eeprom->suspend_pull_downs = buf[0x0A]&0x04;
2991 eeprom->use_serial = (buf[0x0A] & USE_SERIAL_NUM)?1:0;
2992 eeprom->use_usb_version = buf[0x0A] & USE_USB_VERSION_BIT;
2994 // Addr 0C: USB version low byte when 0x0A
2995 // Addr 0D: USB version high byte when 0x0A
2996 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2998 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2999 // Addr 0F: Length of manufacturer string
3000 manufacturer_size = buf[0x0F]/2;
3001 if (eeprom->manufacturer)
3002 free(eeprom->manufacturer);
3003 if (manufacturer_size > 0)
3005 eeprom->manufacturer = malloc(manufacturer_size);
3006 if (eeprom->manufacturer)
3008 // Decode manufacturer
3009 i = buf[0x0E] & (eeprom_size -1); // offset
3010 for (j=0;j<manufacturer_size-1;j++)
3012 eeprom->manufacturer[j] = buf[2*j+i+2];
3014 eeprom->manufacturer[j] = '\0';
3017 else eeprom->manufacturer = NULL;
3019 // Addr 10: Offset of the product string + 0x80, calculated later
3020 // Addr 11: Length of product string
3021 if (eeprom->product)
3022 free(eeprom->product);
3023 product_size = buf[0x11]/2;
3024 if (product_size > 0)
3026 eeprom->product = malloc(product_size);
3027 if (eeprom->product)
3029 // Decode product name
3030 i = buf[0x10] & (eeprom_size -1); // offset
3031 for (j=0;j<product_size-1;j++)
3033 eeprom->product[j] = buf[2*j+i+2];
3035 eeprom->product[j] = '\0';
3038 else eeprom->product = NULL;
3040 // Addr 12: Offset of the serial string + 0x80, calculated later
3041 // Addr 13: Length of serial string
3043 free(eeprom->serial);
3044 serial_size = buf[0x13]/2;
3045 if (serial_size > 0)
3047 eeprom->serial = malloc(serial_size);
3051 i = buf[0x12] & (eeprom_size -1); // offset
3052 for (j=0;j<serial_size-1;j++)
3054 eeprom->serial[j] = buf[2*j+i+2];
3056 eeprom->serial[j] = '\0';
3059 else eeprom->serial = NULL;
3064 for (i = 0; i < eeprom_size/2-1; i++)
3067 value += buf[(i*2)+1] << 8;
3069 checksum = value^checksum;
3070 checksum = (checksum << 1) | (checksum >> 15);
3073 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
3075 if (eeprom_checksum != checksum)
3077 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
3078 ftdi_error_return(-1,"EEPROM checksum error");
3081 eeprom->channel_a_type = 0;
3082 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM))
3086 else if (ftdi->type == TYPE_2232C)
3088 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3089 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3090 eeprom->high_current_a = buf[0x00] & HIGH_CURRENT_DRIVE;
3091 eeprom->channel_b_type = buf[0x01] & 0x7;
3092 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3093 eeprom->high_current_b = buf[0x01] & HIGH_CURRENT_DRIVE;
3094 eeprom->chip = buf[0x14];
3096 else if (ftdi->type == TYPE_R)
3098 /* TYPE_R flags D2XX, not VCP as all others*/
3099 eeprom->channel_a_driver = (~buf[0x00]) & DRIVER_VCP;
3100 eeprom->high_current = buf[0x00] & HIGH_CURRENT_DRIVE_R;
3101 if ( (buf[0x01]&0x40) != 0x40)
3103 "TYPE_R EEPROM byte[0x01] Bit 6 unexpected Endpoint size."
3104 " If this happened with the\n"
3105 " EEPROM programmed by FTDI tools, please report "
3106 "to libftdi@developer.intra2net.com\n");
3108 eeprom->chip = buf[0x16];
3109 // Addr 0B: Invert data lines
3110 // Works only on FT232R, not FT245R, but no way to distinguish
3111 eeprom->invert = buf[0x0B];
3112 // Addr 14: CBUS function: CBUS0, CBUS1
3113 // Addr 15: CBUS function: CBUS2, CBUS3
3114 // Addr 16: CBUS function: CBUS5
3115 eeprom->cbus_function[0] = buf[0x14] & 0x0f;
3116 eeprom->cbus_function[1] = (buf[0x14] >> 4) & 0x0f;
3117 eeprom->cbus_function[2] = buf[0x15] & 0x0f;
3118 eeprom->cbus_function[3] = (buf[0x15] >> 4) & 0x0f;
3119 eeprom->cbus_function[4] = buf[0x16] & 0x0f;
3121 else if ((ftdi->type == TYPE_2232H) ||(ftdi->type == TYPE_4232H))
3123 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3124 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3125 eeprom->channel_b_type = bit2type(buf[0x01] & 0x7);
3126 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3128 if (ftdi->type == TYPE_2232H)
3129 eeprom->suspend_dbus7 = buf[0x01] & SUSPEND_DBUS7_BIT;
3131 eeprom->chip = buf[0x18];
3132 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3133 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3134 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3135 eeprom->group1_drive = (buf[0x0c] >> 4) & 0x3;
3136 eeprom->group1_schmitt = (buf[0x0c] >> 4) & IS_SCHMITT;
3137 eeprom->group1_slew = (buf[0x0c] >> 4) & SLOW_SLEW;
3138 eeprom->group2_drive = buf[0x0d] & DRIVE_16MA;
3139 eeprom->group2_schmitt = buf[0x0d] & IS_SCHMITT;
3140 eeprom->group2_slew = buf[0x0d] & SLOW_SLEW;
3141 eeprom->group3_drive = (buf[0x0d] >> 4) & DRIVE_16MA;
3142 eeprom->group3_schmitt = (buf[0x0d] >> 4) & IS_SCHMITT;
3143 eeprom->group3_slew = (buf[0x0d] >> 4) & SLOW_SLEW;
3145 else if (ftdi->type == TYPE_232H)
3149 eeprom->channel_a_type = buf[0x00] & 0xf;
3150 eeprom->channel_a_driver = (buf[0x00] & DRIVER_VCPH)?DRIVER_VCP:0;
3151 eeprom->clock_polarity = buf[0x01] & FT1284_CLK_IDLE_STATE;
3152 eeprom->data_order = buf[0x01] & FT1284_DATA_LSB;
3153 eeprom->flow_control = buf[0x01] & FT1284_FLOW_CONTROL;
3154 eeprom->powersave = buf[0x01] & POWER_SAVE_DISABLE_H;
3155 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3156 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3157 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3158 eeprom->group1_drive = buf[0x0d] & DRIVE_16MA;
3159 eeprom->group1_schmitt = buf[0x0d] & IS_SCHMITT;
3160 eeprom->group1_slew = buf[0x0d] & SLOW_SLEW;
3164 eeprom->cbus_function[2*i ] = buf[0x18+i] & 0x0f;
3165 eeprom->cbus_function[2*i+1] = (buf[0x18+i] >> 4) & 0x0f;
3167 eeprom->chip = buf[0x1e];
3168 /*FIXME: Decipher more values*/
3173 char *channel_mode[] = {"UART", "FIFO", "CPU", "OPTO", "FT1284"};
3174 fprintf(stdout, "VID: 0x%04x\n",eeprom->vendor_id);
3175 fprintf(stdout, "PID: 0x%04x\n",eeprom->product_id);
3176 fprintf(stdout, "Release: 0x%04x\n",release);
3178 if (eeprom->self_powered)
3179 fprintf(stdout, "Self-Powered%s", (eeprom->remote_wakeup)?", USB Remote Wake Up\n":"\n");
3181 fprintf(stdout, "Bus Powered: %3d mA%s", eeprom->max_power * 2,
3182 (eeprom->remote_wakeup)?" USB Remote Wake Up\n":"\n");
3183 if (eeprom->manufacturer)
3184 fprintf(stdout, "Manufacturer: %s\n",eeprom->manufacturer);
3185 if (eeprom->product)
3186 fprintf(stdout, "Product: %s\n",eeprom->product);
3188 fprintf(stdout, "Serial: %s\n",eeprom->serial);
3189 fprintf(stdout, "Checksum : %04x\n", checksum);
3190 if (ftdi->type == TYPE_R)
3191 fprintf(stdout, "Internal EEPROM\n");
3192 else if (eeprom->chip >= 0x46)
3193 fprintf(stdout, "Attached EEPROM: 93x%02x\n", eeprom->chip);
3194 if (eeprom->suspend_dbus7)
3195 fprintf(stdout, "Suspend on DBUS7\n");
3196 if (eeprom->suspend_pull_downs)
3197 fprintf(stdout, "Pull IO pins low during suspend\n");
3198 if(eeprom->powersave)
3200 if(ftdi->type >= TYPE_232H)
3201 fprintf(stdout,"Enter low power state on ACBUS7\n");
3203 if (eeprom->remote_wakeup)
3204 fprintf(stdout, "Enable Remote Wake Up\n");
3205 fprintf(stdout, "PNP: %d\n",(eeprom->is_not_pnp)?0:1);
3206 if (ftdi->type >= TYPE_2232C)
3207 fprintf(stdout,"Channel A has Mode %s%s%s\n",
3208 channel_mode[eeprom->channel_a_type],
3209 (eeprom->channel_a_driver)?" VCP":"",
3210 (eeprom->high_current_a)?" High Current IO":"");
3211 if (ftdi->type >= TYPE_232H)
3213 fprintf(stdout,"FT1284 Mode Clock is idle %s, %s first, %sFlow Control\n",
3214 (eeprom->clock_polarity)?"HIGH":"LOW",
3215 (eeprom->data_order)?"LSB":"MSB",
3216 (eeprom->flow_control)?"":"No ");
3218 if ((ftdi->type >= TYPE_2232C) && (ftdi->type != TYPE_R) && (ftdi->type != TYPE_232H))
3219 fprintf(stdout,"Channel B has Mode %s%s%s\n",
3220 channel_mode[eeprom->channel_b_type],
3221 (eeprom->channel_b_driver)?" VCP":"",
3222 (eeprom->high_current_b)?" High Current IO":"");
3223 if (((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C)) &&
3224 eeprom->use_usb_version == USE_USB_VERSION_BIT)
3225 fprintf(stdout,"Use explicit USB Version %04x\n",eeprom->usb_version);
3227 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
3229 fprintf(stdout,"%s has %d mA drive%s%s\n",
3230 (ftdi->type == TYPE_2232H)?"AL":"A",
3231 (eeprom->group0_drive+1) *4,
3232 (eeprom->group0_schmitt)?" Schmitt Input":"",
3233 (eeprom->group0_slew)?" Slow Slew":"");
3234 fprintf(stdout,"%s has %d mA drive%s%s\n",
3235 (ftdi->type == TYPE_2232H)?"AH":"B",
3236 (eeprom->group1_drive+1) *4,
3237 (eeprom->group1_schmitt)?" Schmitt Input":"",
3238 (eeprom->group1_slew)?" Slow Slew":"");
3239 fprintf(stdout,"%s has %d mA drive%s%s\n",
3240 (ftdi->type == TYPE_2232H)?"BL":"C",
3241 (eeprom->group2_drive+1) *4,
3242 (eeprom->group2_schmitt)?" Schmitt Input":"",
3243 (eeprom->group2_slew)?" Slow Slew":"");
3244 fprintf(stdout,"%s has %d mA drive%s%s\n",
3245 (ftdi->type == TYPE_2232H)?"BH":"D",
3246 (eeprom->group3_drive+1) *4,
3247 (eeprom->group3_schmitt)?" Schmitt Input":"",
3248 (eeprom->group3_slew)?" Slow Slew":"");
3250 else if (ftdi->type == TYPE_232H)
3253 char *cbush_mux[] = {"TRISTATE","RXLED","TXLED", "TXRXLED","PWREN",
3254 "SLEEP","DRIVE_0","DRIVE_1","IOMODE","TXDEN",
3255 "CLK30","CLK15","CLK7_5"
3257 fprintf(stdout,"ACBUS has %d mA drive%s%s\n",
3258 (eeprom->group0_drive+1) *4,
3259 (eeprom->group0_schmitt)?" Schmitt Input":"",
3260 (eeprom->group0_slew)?" Slow Slew":"");
3261 fprintf(stdout,"ADBUS has %d mA drive%s%s\n",
3262 (eeprom->group1_drive+1) *4,
3263 (eeprom->group1_schmitt)?" Schmitt Input":"",
3264 (eeprom->group1_slew)?" Slow Slew":"");
3265 for (i=0; i<10; i++)
3267 if (eeprom->cbus_function[i]<= CBUSH_CLK7_5 )
3268 fprintf(stdout,"C%d Function: %s\n", i,
3269 cbush_mux[eeprom->cbus_function[i]]);
3274 if (ftdi->type == TYPE_R)
3276 char *cbus_mux[] = {"TXDEN","PWREN","RXLED", "TXLED","TX+RXLED",
3277 "SLEEP","CLK48","CLK24","CLK12","CLK6",
3278 "IOMODE","BB_WR","BB_RD"
3280 char *cbus_BB[] = {"RXF","TXE","RD", "WR"};
3284 char *r_bits[] = {"TXD","RXD","RTS", "CTS","DTR","DSR","DCD","RI"};
3285 fprintf(stdout,"Inverted bits:");
3287 if ((eeprom->invert & (1<<i)) == (1<<i))
3288 fprintf(stdout," %s",r_bits[i]);
3289 fprintf(stdout,"\n");
3293 if (eeprom->cbus_function[i]<CBUS_BB)
3294 fprintf(stdout,"C%d Function: %s\n", i,
3295 cbus_mux[eeprom->cbus_function[i]]);
3299 /* Running MPROG show that C0..3 have fixed function Synchronous
3301 fprintf(stdout,"C%d BB Function: %s\n", i,
3304 fprintf(stdout, "Unknown CBUS mode. Might be special mode?\n");
3313 Get a value from the decoded EEPROM structure
3315 \param ftdi pointer to ftdi_context
3316 \param value_name Enum of the value to query
3317 \param value Pointer to store read value
3320 \retval -1: Value doesn't exist
3322 int ftdi_get_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int* value)
3327 *value = ftdi->eeprom->vendor_id;
3330 *value = ftdi->eeprom->product_id;
3333 *value = ftdi->eeprom->self_powered;
3336 *value = ftdi->eeprom->remote_wakeup;
3339 *value = ftdi->eeprom->is_not_pnp;
3342 *value = ftdi->eeprom->suspend_dbus7;
3344 case IN_IS_ISOCHRONOUS:
3345 *value = ftdi->eeprom->in_is_isochronous;
3347 case OUT_IS_ISOCHRONOUS:
3348 *value = ftdi->eeprom->out_is_isochronous;
3350 case SUSPEND_PULL_DOWNS:
3351 *value = ftdi->eeprom->suspend_pull_downs;
3354 *value = ftdi->eeprom->use_serial;
3357 *value = ftdi->eeprom->usb_version;
3359 case USE_USB_VERSION:
3360 *value = ftdi->eeprom->use_usb_version;
3363 *value = ftdi->eeprom->max_power;
3365 case CHANNEL_A_TYPE:
3366 *value = ftdi->eeprom->channel_a_type;
3368 case CHANNEL_B_TYPE:
3369 *value = ftdi->eeprom->channel_b_type;
3371 case CHANNEL_A_DRIVER:
3372 *value = ftdi->eeprom->channel_a_driver;
3374 case CHANNEL_B_DRIVER:
3375 *value = ftdi->eeprom->channel_b_driver;
3377 case CBUS_FUNCTION_0:
3378 *value = ftdi->eeprom->cbus_function[0];
3380 case CBUS_FUNCTION_1:
3381 *value = ftdi->eeprom->cbus_function[1];
3383 case CBUS_FUNCTION_2:
3384 *value = ftdi->eeprom->cbus_function[2];
3386 case CBUS_FUNCTION_3:
3387 *value = ftdi->eeprom->cbus_function[3];
3389 case CBUS_FUNCTION_4:
3390 *value = ftdi->eeprom->cbus_function[4];
3392 case CBUS_FUNCTION_5:
3393 *value = ftdi->eeprom->cbus_function[5];
3395 case CBUS_FUNCTION_6:
3396 *value = ftdi->eeprom->cbus_function[6];
3398 case CBUS_FUNCTION_7:
3399 *value = ftdi->eeprom->cbus_function[7];
3401 case CBUS_FUNCTION_8:
3402 *value = ftdi->eeprom->cbus_function[8];
3404 case CBUS_FUNCTION_9:
3405 *value = ftdi->eeprom->cbus_function[8];
3408 *value = ftdi->eeprom->high_current;
3410 case HIGH_CURRENT_A:
3411 *value = ftdi->eeprom->high_current_a;
3413 case HIGH_CURRENT_B:
3414 *value = ftdi->eeprom->high_current_b;
3417 *value = ftdi->eeprom->invert;
3420 *value = ftdi->eeprom->group0_drive;
3422 case GROUP0_SCHMITT:
3423 *value = ftdi->eeprom->group0_schmitt;
3426 *value = ftdi->eeprom->group0_slew;
3429 *value = ftdi->eeprom->group1_drive;
3431 case GROUP1_SCHMITT:
3432 *value = ftdi->eeprom->group1_schmitt;
3435 *value = ftdi->eeprom->group1_slew;
3438 *value = ftdi->eeprom->group2_drive;
3440 case GROUP2_SCHMITT:
3441 *value = ftdi->eeprom->group2_schmitt;
3444 *value = ftdi->eeprom->group2_slew;
3447 *value = ftdi->eeprom->group3_drive;
3449 case GROUP3_SCHMITT:
3450 *value = ftdi->eeprom->group3_schmitt;
3453 *value = ftdi->eeprom->group3_slew;
3456 *value = ftdi->eeprom->powersave;
3458 case CLOCK_POLARITY:
3459 *value = ftdi->eeprom->clock_polarity;
3462 *value = ftdi->eeprom->data_order;
3465 *value = ftdi->eeprom->flow_control;
3468 *value = ftdi->eeprom->chip;
3471 *value = ftdi->eeprom->size;
3474 ftdi_error_return(-1, "Request for unknown EEPROM value");
3480 Set a value in the decoded EEPROM Structure
3481 No parameter checking is performed
3483 \param ftdi pointer to ftdi_context
3484 \param value_name Enum of the value to set
3488 \retval -1: Value doesn't exist
3489 \retval -2: Value not user settable
3491 int ftdi_set_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int value)
3496 ftdi->eeprom->vendor_id = value;
3499 ftdi->eeprom->product_id = value;
3502 ftdi->eeprom->self_powered = value;
3505 ftdi->eeprom->remote_wakeup = value;
3508 ftdi->eeprom->is_not_pnp = value;
3511 ftdi->eeprom->suspend_dbus7 = value;
3513 case IN_IS_ISOCHRONOUS:
3514 ftdi->eeprom->in_is_isochronous = value;
3516 case OUT_IS_ISOCHRONOUS:
3517 ftdi->eeprom->out_is_isochronous = value;
3519 case SUSPEND_PULL_DOWNS:
3520 ftdi->eeprom->suspend_pull_downs = value;
3523 ftdi->eeprom->use_serial = value;
3526 ftdi->eeprom->usb_version = value;
3528 case USE_USB_VERSION:
3529 ftdi->eeprom->use_usb_version = value;
3532 ftdi->eeprom->max_power = value;
3534 case CHANNEL_A_TYPE:
3535 ftdi->eeprom->channel_a_type = value;
3537 case CHANNEL_B_TYPE:
3538 ftdi->eeprom->channel_b_type = value;
3540 case CHANNEL_A_DRIVER:
3541 ftdi->eeprom->channel_a_driver = value;
3543 case CHANNEL_B_DRIVER:
3544 ftdi->eeprom->channel_b_driver = value;
3546 case CBUS_FUNCTION_0:
3547 ftdi->eeprom->cbus_function[0] = value;
3549 case CBUS_FUNCTION_1:
3550 ftdi->eeprom->cbus_function[1] = value;
3552 case CBUS_FUNCTION_2:
3553 ftdi->eeprom->cbus_function[2] = value;
3555 case CBUS_FUNCTION_3:
3556 ftdi->eeprom->cbus_function[3] = value;
3558 case CBUS_FUNCTION_4:
3559 ftdi->eeprom->cbus_function[4] = value;
3561 case CBUS_FUNCTION_5:
3562 ftdi->eeprom->cbus_function[5] = value;
3564 case CBUS_FUNCTION_6:
3565 ftdi->eeprom->cbus_function[6] = value;
3567 case CBUS_FUNCTION_7:
3568 ftdi->eeprom->cbus_function[7] = value;
3570 case CBUS_FUNCTION_8:
3571 ftdi->eeprom->cbus_function[8] = value;
3573 case CBUS_FUNCTION_9:
3574 ftdi->eeprom->cbus_function[9] = value;
3577 ftdi->eeprom->high_current = value;
3579 case HIGH_CURRENT_A:
3580 ftdi->eeprom->high_current_a = value;
3582 case HIGH_CURRENT_B:
3583 ftdi->eeprom->high_current_b = value;
3586 ftdi->eeprom->invert = value;
3589 ftdi->eeprom->group0_drive = value;
3591 case GROUP0_SCHMITT:
3592 ftdi->eeprom->group0_schmitt = value;
3595 ftdi->eeprom->group0_slew = value;
3598 ftdi->eeprom->group1_drive = value;
3600 case GROUP1_SCHMITT:
3601 ftdi->eeprom->group1_schmitt = value;
3604 ftdi->eeprom->group1_slew = value;
3607 ftdi->eeprom->group2_drive = value;
3609 case GROUP2_SCHMITT:
3610 ftdi->eeprom->group2_schmitt = value;
3613 ftdi->eeprom->group2_slew = value;
3616 ftdi->eeprom->group3_drive = value;
3618 case GROUP3_SCHMITT:
3619 ftdi->eeprom->group3_schmitt = value;
3622 ftdi->eeprom->group3_slew = value;
3625 ftdi->eeprom->chip = value;
3628 ftdi->eeprom->powersave = value;
3630 case CLOCK_POLARITY:
3631 ftdi->eeprom->clock_polarity = value;
3634 ftdi->eeprom->data_order = value;
3637 ftdi->eeprom->flow_control = value;
3640 ftdi_error_return(-2, "EEPROM Value can't be changed");
3642 ftdi_error_return(-1, "Request to unknown EEPROM value");
3647 /** Get the read-only buffer to the binary EEPROM content
3649 \param ftdi pointer to ftdi_context
3650 \param buf buffer to receive EEPROM content
3651 \param size Size of receiving buffer
3654 \retval -1: struct ftdi_contxt or ftdi_eeprom missing
3655 \retval -2: Not enough room to store eeprom
3657 int ftdi_get_eeprom_buf(struct ftdi_context *ftdi, unsigned char * buf, int size)
3659 if (!ftdi || !(ftdi->eeprom))
3660 ftdi_error_return(-1, "No appropriate structure");
3662 if (!buf || size < ftdi->eeprom->size)
3663 ftdi_error_return(-1, "Not enough room to store eeprom");
3665 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
3666 if (size > FTDI_MAX_EEPROM_SIZE)
3667 size = FTDI_MAX_EEPROM_SIZE;
3669 memcpy(buf, ftdi->eeprom->buf, size);
3674 /** Set the EEPROM content from the user-supplied prefilled buffer
3676 \param ftdi pointer to ftdi_context
3677 \param buf buffer to read EEPROM content
3678 \param size Size of buffer
3681 \retval -1: struct ftdi_contxt or ftdi_eeprom of buf missing
3683 int ftdi_set_eeprom_buf(struct ftdi_context *ftdi, const unsigned char * buf, int size)
3685 if (!ftdi || !(ftdi->eeprom) || !buf)
3686 ftdi_error_return(-1, "No appropriate structure");
3688 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
3689 if (size > FTDI_MAX_EEPROM_SIZE)
3690 size = FTDI_MAX_EEPROM_SIZE;
3692 memcpy(ftdi->eeprom->buf, buf, size);
3698 Read eeprom location
3700 \param ftdi pointer to ftdi_context
3701 \param eeprom_addr Address of eeprom location to be read
3702 \param eeprom_val Pointer to store read eeprom location
3705 \retval -1: read failed
3706 \retval -2: USB device unavailable
3708 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
3710 if (ftdi == NULL || ftdi->usb_dev == NULL)
3711 ftdi_error_return(-2, "USB device unavailable");
3713 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)
3714 ftdi_error_return(-1, "reading eeprom failed");
3722 \param ftdi pointer to ftdi_context
3725 \retval -1: read failed
3726 \retval -2: USB device unavailable
3728 int ftdi_read_eeprom(struct ftdi_context *ftdi)
3733 if (ftdi == NULL || ftdi->usb_dev == NULL)
3734 ftdi_error_return(-2, "USB device unavailable");
3735 buf = ftdi->eeprom->buf;
3737 for (i = 0; i < FTDI_MAX_EEPROM_SIZE/2; i++)
3739 if (libusb_control_transfer(
3740 ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,SIO_READ_EEPROM_REQUEST, 0, i,
3741 buf+(i*2), 2, ftdi->usb_read_timeout) != 2)
3742 ftdi_error_return(-1, "reading eeprom failed");
3745 if (ftdi->type == TYPE_R)
3746 ftdi->eeprom->size = 0x80;
3747 /* Guesses size of eeprom by comparing halves
3748 - will not work with blank eeprom */
3749 else if (strrchr((const char *)buf, 0xff) == ((const char *)buf +FTDI_MAX_EEPROM_SIZE -1))
3750 ftdi->eeprom->size = -1;
3751 else if (memcmp(buf,&buf[0x80],0x80) == 0)
3752 ftdi->eeprom->size = 0x80;
3753 else if (memcmp(buf,&buf[0x40],0x40) == 0)
3754 ftdi->eeprom->size = 0x40;
3756 ftdi->eeprom->size = 0x100;
3761 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
3762 Function is only used internally
3765 static unsigned char ftdi_read_chipid_shift(unsigned char value)
3767 return ((value & 1) << 1) |
3768 ((value & 2) << 5) |
3769 ((value & 4) >> 2) |
3770 ((value & 8) << 4) |
3771 ((value & 16) >> 1) |
3772 ((value & 32) >> 1) |
3773 ((value & 64) >> 4) |
3774 ((value & 128) >> 2);
3778 Read the FTDIChip-ID from R-type devices
3780 \param ftdi pointer to ftdi_context
3781 \param chipid Pointer to store FTDIChip-ID
3784 \retval -1: read failed
3785 \retval -2: USB device unavailable
3787 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
3789 unsigned int a = 0, b = 0;
3791 if (ftdi == NULL || ftdi->usb_dev == NULL)
3792 ftdi_error_return(-2, "USB device unavailable");
3794 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)
3796 a = a << 8 | a >> 8;
3797 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)
3799 b = b << 8 | b >> 8;
3800 a = (a << 16) | (b & 0xFFFF);
3801 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
3802 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
3803 *chipid = a ^ 0xa5f0f7d1;
3808 ftdi_error_return(-1, "read of FTDIChip-ID failed");
3812 Write eeprom location
3814 \param ftdi pointer to ftdi_context
3815 \param eeprom_addr Address of eeprom location to be written
3816 \param eeprom_val Value to be written
3819 \retval -1: write failed
3820 \retval -2: USB device unavailable
3821 \retval -3: Invalid access to checksum protected area below 0x80
3822 \retval -4: Device can't access unprotected area
3823 \retval -5: Reading chip type failed
3825 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr,
3826 unsigned short eeprom_val)
3828 int chip_type_location;
3829 unsigned short chip_type;
3831 if (ftdi == NULL || ftdi->usb_dev == NULL)
3832 ftdi_error_return(-2, "USB device unavailable");
3834 if (eeprom_addr <0x80)
3835 ftdi_error_return(-2, "Invalid access to checksum protected area below 0x80");
3842 chip_type_location = 0x14;
3846 chip_type_location = 0x18;
3849 chip_type_location = 0x1e;
3852 ftdi_error_return(-4, "Device can't access unprotected area");
3855 if (ftdi_read_eeprom_location( ftdi, chip_type_location>>1, &chip_type))
3856 ftdi_error_return(-5, "Reading failed failed");
3857 fprintf(stderr," loc 0x%04x val 0x%04x\n", chip_type_location,chip_type);
3858 if ((chip_type & 0xff) != 0x66)
3860 ftdi_error_return(-6, "EEPROM is not of 93x66");
3863 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3864 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
3865 NULL, 0, ftdi->usb_write_timeout) != 0)
3866 ftdi_error_return(-1, "unable to write eeprom");
3874 \param ftdi pointer to ftdi_context
3877 \retval -1: read failed
3878 \retval -2: USB device unavailable
3879 \retval -3: EEPROM not initialized for the connected device;
3881 int ftdi_write_eeprom(struct ftdi_context *ftdi)
3883 unsigned short usb_val, status;
3885 unsigned char *eeprom;
3887 if (ftdi == NULL || ftdi->usb_dev == NULL)
3888 ftdi_error_return(-2, "USB device unavailable");
3890 if(ftdi->eeprom->initialized_for_connected_device == 0)
3891 ftdi_error_return(-3, "EEPROM not initialized for the connected device");
3893 eeprom = ftdi->eeprom->buf;
3895 /* These commands were traced while running MProg */
3896 if ((ret = ftdi_usb_reset(ftdi)) != 0)
3898 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
3900 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
3903 for (i = 0; i < ftdi->eeprom->size/2; i++)
3905 usb_val = eeprom[i*2];
3906 usb_val += eeprom[(i*2)+1] << 8;
3907 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3908 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
3909 NULL, 0, ftdi->usb_write_timeout) < 0)
3910 ftdi_error_return(-1, "unable to write eeprom");
3919 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
3921 \param ftdi pointer to ftdi_context
3924 \retval -1: erase failed
3925 \retval -2: USB device unavailable
3926 \retval -3: Writing magic failed
3927 \retval -4: Read EEPROM failed
3928 \retval -5: Unexpected EEPROM value
3930 #define MAGIC 0x55aa
3931 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
3933 unsigned short eeprom_value;
3934 if (ftdi == NULL || ftdi->usb_dev == NULL)
3935 ftdi_error_return(-2, "USB device unavailable");
3937 if (ftdi->type == TYPE_R)
3939 ftdi->eeprom->chip = 0;
3943 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
3944 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
3945 ftdi_error_return(-1, "unable to erase eeprom");
3948 /* detect chip type by writing 0x55AA as magic at word position 0xc0
3949 Chip is 93x46 if magic is read at word position 0x00, as wraparound happens around 0x40
3950 Chip is 93x56 if magic is read at word position 0x40, as wraparound happens around 0x80
3951 Chip is 93x66 if magic is only read at word position 0xc0*/
3952 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3953 SIO_WRITE_EEPROM_REQUEST, MAGIC, 0xc0,
3954 NULL, 0, ftdi->usb_write_timeout) != 0)
3955 ftdi_error_return(-3, "Writing magic failed");
3956 if (ftdi_read_eeprom_location( ftdi, 0x00, &eeprom_value))
3957 ftdi_error_return(-4, "Reading failed failed");
3958 if (eeprom_value == MAGIC)
3960 ftdi->eeprom->chip = 0x46;
3964 if (ftdi_read_eeprom_location( ftdi, 0x40, &eeprom_value))
3965 ftdi_error_return(-4, "Reading failed failed");
3966 if (eeprom_value == MAGIC)
3967 ftdi->eeprom->chip = 0x56;
3970 if (ftdi_read_eeprom_location( ftdi, 0xc0, &eeprom_value))
3971 ftdi_error_return(-4, "Reading failed failed");
3972 if (eeprom_value == MAGIC)
3973 ftdi->eeprom->chip = 0x66;
3976 ftdi->eeprom->chip = -1;
3980 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
3981 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
3982 ftdi_error_return(-1, "unable to erase eeprom");
3987 Get string representation for last error code
3989 \param ftdi pointer to ftdi_context
3991 \retval Pointer to error string
3993 char *ftdi_get_error_string (struct ftdi_context *ftdi)
3998 return ftdi->error_str;
4001 /* @} end of doxygen libftdi group */