1 /***************************************************************************
5 copyright : (C) 2003-2008 by Intra2net AG
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; \
46 Internal function to close usb device pointer.
47 Sets ftdi->usb_dev to NULL.
50 \param ftdi pointer to ftdi_context
54 static void ftdi_usb_close_internal (struct ftdi_context *ftdi)
58 libusb_close (ftdi->usb_dev);
64 Initializes a ftdi_context.
66 \param ftdi pointer to ftdi_context
69 \retval -1: couldn't allocate read buffer
71 \remark This should be called before all functions
73 int ftdi_init(struct ftdi_context *ftdi)
76 ftdi->usb_read_timeout = 5000;
77 ftdi->usb_write_timeout = 5000;
79 ftdi->type = TYPE_BM; /* chip type */
81 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
83 ftdi->readbuffer = NULL;
84 ftdi->readbuffer_offset = 0;
85 ftdi->readbuffer_remaining = 0;
86 ftdi->writebuffer_chunksize = 4096;
87 ftdi->max_packet_size = 0;
93 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
95 ftdi->error_str = NULL;
97 ftdi->eeprom_size = FTDI_DEFAULT_EEPROM_SIZE;
99 /* All fine. Now allocate the readbuffer */
100 return ftdi_read_data_set_chunksize(ftdi, 4096);
104 Allocate and initialize a new ftdi_context
106 \return a pointer to a new ftdi_context, or NULL on failure
108 struct ftdi_context *ftdi_new(void)
110 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
117 if (ftdi_init(ftdi) != 0)
127 Open selected channels on a chip, otherwise use first channel.
129 \param ftdi pointer to ftdi_context
130 \param interface Interface to use for FT2232C/2232H/4232H chips.
133 \retval -1: unknown interface
135 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
141 /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */
145 ftdi->index = INTERFACE_B;
151 ftdi->index = INTERFACE_C;
157 ftdi->index = INTERFACE_D;
162 ftdi_error_return(-1, "Unknown interface");
168 Deinitializes a ftdi_context.
170 \param ftdi pointer to ftdi_context
172 void ftdi_deinit(struct ftdi_context *ftdi)
174 ftdi_usb_close_internal (ftdi);
176 if (ftdi->readbuffer != NULL)
178 free(ftdi->readbuffer);
179 ftdi->readbuffer = NULL;
184 Deinitialize and free an ftdi_context.
186 \param ftdi pointer to ftdi_context
188 void ftdi_free(struct ftdi_context *ftdi)
195 Use an already open libusb device.
197 \param ftdi pointer to ftdi_context
198 \param usb libusb libusb_device_handle to use
200 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
207 Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which
208 needs to be deallocated by ftdi_list_free() after use.
210 \param ftdi pointer to ftdi_context
211 \param devlist Pointer where to store list of found devices
212 \param vendor Vendor ID to search for
213 \param product Product ID to search for
215 \retval >0: number of devices found
216 \retval -3: out of memory
217 \retval -4: libusb_init() failed
218 \retval -5: libusb_get_device_list() failed
219 \retval -6: libusb_get_device_descriptor() failed
221 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
223 struct ftdi_device_list **curdev;
225 libusb_device **devs;
229 if (libusb_init(NULL) < 0)
230 ftdi_error_return(-4, "libusb_init() failed");
232 if (libusb_get_device_list(NULL, &devs) < 0)
233 ftdi_error_return(-5, "libusb_get_device_list() failed");
238 while ((dev = devs[i++]) != NULL)
240 struct libusb_device_descriptor desc;
242 if (libusb_get_device_descriptor(dev, &desc) < 0)
243 ftdi_error_return(-6, "libusb_get_device_descriptor() failed");
245 if (desc.idVendor == vendor && desc.idProduct == product)
247 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
249 ftdi_error_return(-3, "out of memory");
251 (*curdev)->next = NULL;
252 (*curdev)->dev = dev;
254 curdev = &(*curdev)->next;
263 Frees a usb device list.
265 \param devlist USB device list created by ftdi_usb_find_all()
267 void ftdi_list_free(struct ftdi_device_list **devlist)
269 struct ftdi_device_list *curdev, *next;
271 for (curdev = *devlist; curdev != NULL;)
282 Frees a usb device list.
284 \param devlist USB device list created by ftdi_usb_find_all()
286 void ftdi_list_free2(struct ftdi_device_list *devlist)
288 ftdi_list_free(&devlist);
292 Return device ID strings from the usb device.
294 The parameters manufacturer, description and serial may be NULL
295 or pointer to buffers to store the fetched strings.
297 \note Use this function only in combination with ftdi_usb_find_all()
298 as it closes the internal "usb_dev" after use.
300 \param ftdi pointer to ftdi_context
301 \param dev libusb usb_dev to use
302 \param manufacturer Store manufacturer string here if not NULL
303 \param mnf_len Buffer size of manufacturer string
304 \param description Store product description string here if not NULL
305 \param desc_len Buffer size of product description string
306 \param serial Store serial string here if not NULL
307 \param serial_len Buffer size of serial string
310 \retval -1: wrong arguments
311 \retval -4: unable to open device
312 \retval -7: get product manufacturer failed
313 \retval -8: get product description failed
314 \retval -9: get serial number failed
315 \retval -11: libusb_get_device_descriptor() failed
317 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
318 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
320 struct libusb_device_descriptor desc;
322 if ((ftdi==NULL) || (dev==NULL))
325 if (libusb_open(dev, &ftdi->usb_dev) < 0)
326 ftdi_error_return(-4, "libusb_open() failed");
328 if (libusb_get_device_descriptor(dev, &desc) < 0)
329 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
331 if (manufacturer != NULL)
333 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
335 ftdi_usb_close_internal (ftdi);
336 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
340 if (description != NULL)
342 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
344 ftdi_usb_close_internal (ftdi);
345 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
351 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
353 ftdi_usb_close_internal (ftdi);
354 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
358 ftdi_usb_close_internal (ftdi);
364 * Internal function to determine the maximum packet size.
365 * \param ftdi pointer to ftdi_context
366 * \param dev libusb usb_dev to use
367 * \retval Maximum packet size for this device
369 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
371 struct libusb_device_descriptor desc;
372 struct libusb_config_descriptor *config0;
373 unsigned int packet_size;
375 // Determine maximum packet size. Init with default value.
376 // New hi-speed devices from FTDI use a packet size of 512 bytes
377 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
378 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
383 if (libusb_get_device_descriptor(dev, &desc) < 0)
386 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
389 if (desc.bNumConfigurations > 0)
391 if (ftdi->interface < config0->bNumInterfaces)
393 struct libusb_interface interface = config0->interface[ftdi->interface];
394 if (interface.num_altsetting > 0)
396 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
397 if (descriptor.bNumEndpoints > 0)
399 packet_size = descriptor.endpoint[0].wMaxPacketSize;
405 libusb_free_config_descriptor (config0);
410 Opens a ftdi device given by an usb_device.
412 \param ftdi pointer to ftdi_context
413 \param dev libusb usb_dev to use
416 \retval -3: unable to config device
417 \retval -4: unable to open device
418 \retval -5: unable to claim device
419 \retval -6: reset failed
420 \retval -7: set baudrate failed
421 \retval -9: libusb_get_device_descriptor() failed
422 \retval -10: libusb_get_config_descriptor() failed
423 \retval -11: libusb_etach_kernel_driver() failed
424 \retval -12: libusb_get_configuration() failed
426 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
428 struct libusb_device_descriptor desc;
429 struct libusb_config_descriptor *config0;
432 if (libusb_open(dev, &ftdi->usb_dev) < 0)
433 ftdi_error_return(-4, "libusb_open() failed");
435 if (libusb_get_device_descriptor(dev, &desc) < 0)
436 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
438 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
439 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
440 cfg0 = config0->bConfigurationValue;
441 libusb_free_config_descriptor (config0);
443 #ifdef LIBUSB_HAS_GET_DRIVER_NP
444 // Try to detach ftdi_sio kernel module.
445 // Returns ENODATA if driver is not loaded.
447 // The return code is kept in a separate variable and only parsed
448 // if usb_set_configuration() or usb_claim_interface() fails as the
449 // detach operation might be denied and everything still works fine.
450 // Likely scenario is a static ftdi_sio kernel module.
451 ret = libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface);
452 if (ret < 0 && ret != LIBUSB_ERROR_NOT_FOUND)
453 ftdi_error_return(-11, "libusb_detach_kernel_driver () failed");
456 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
457 ftdi_error_return(-12, "libusb_get_configuration () failed");
459 // set configuration (needed especially for windows)
460 // tolerate EBUSY: one device with one configuration, but two interfaces
461 // and libftdi sessions to both interfaces (e.g. FT2232)
462 if (desc.bNumConfigurations > 0 && cfg != cfg0)
464 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
466 ftdi_usb_close_internal (ftdi);
467 ftdi_error_return(-3, "unable to set usb configuration. Make sure ftdi_sio is unloaded!");
471 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
473 ftdi_usb_close_internal (ftdi);
474 ftdi_error_return(-5, "unable to claim usb device. Make sure ftdi_sio is unloaded!");
477 if (ftdi_usb_reset (ftdi) != 0)
479 ftdi_usb_close_internal (ftdi);
480 ftdi_error_return(-6, "ftdi_usb_reset failed");
483 // Try to guess chip type
484 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
485 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
486 && desc.iSerialNumber == 0))
487 ftdi->type = TYPE_BM;
488 else if (desc.bcdDevice == 0x200)
489 ftdi->type = TYPE_AM;
490 else if (desc.bcdDevice == 0x500)
491 ftdi->type = TYPE_2232C;
492 else if (desc.bcdDevice == 0x600)
494 else if (desc.bcdDevice == 0x700)
495 ftdi->type = TYPE_2232H;
496 else if (desc.bcdDevice == 0x800)
497 ftdi->type = TYPE_4232H;
499 // Set default interface on dual/quad type chips
506 ftdi->index = INTERFACE_A;
512 // Determine maximum packet size
513 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
515 if (ftdi_set_baudrate (ftdi, 9600) != 0)
517 ftdi_usb_close_internal (ftdi);
518 ftdi_error_return(-7, "set baudrate failed");
521 ftdi_error_return(0, "all fine");
525 Opens the first device with a given vendor and product ids.
527 \param ftdi pointer to ftdi_context
528 \param vendor Vendor ID
529 \param product Product ID
531 \retval same as ftdi_usb_open_desc()
533 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
535 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
539 Opens the first device with a given, vendor id, product id,
540 description and serial.
542 \param ftdi pointer to ftdi_context
543 \param vendor Vendor ID
544 \param product Product ID
545 \param description Description to search for. Use NULL if not needed.
546 \param serial Serial to search for. Use NULL if not needed.
549 \retval -3: usb device not found
550 \retval -4: unable to open device
551 \retval -5: unable to claim device
552 \retval -6: reset failed
553 \retval -7: set baudrate failed
554 \retval -8: get product description failed
555 \retval -9: get serial number failed
556 \retval -11: libusb_init() failed
557 \retval -12: libusb_get_device_list() failed
558 \retval -13: libusb_get_device_descriptor() failed
560 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
561 const char* description, const char* serial)
563 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
567 Opens the index-th device with a given, vendor id, product id,
568 description and serial.
570 \param ftdi pointer to ftdi_context
571 \param vendor Vendor ID
572 \param product Product ID
573 \param description Description to search for. Use NULL if not needed.
574 \param serial Serial to search for. Use NULL if not needed.
575 \param index Number of matching device to open if there are more than one, starts with 0.
578 \retval -1: usb_find_busses() failed
579 \retval -2: usb_find_devices() failed
580 \retval -3: usb device not found
581 \retval -4: unable to open device
582 \retval -5: unable to claim device
583 \retval -6: reset failed
584 \retval -7: set baudrate failed
585 \retval -8: get product description failed
586 \retval -9: get serial number failed
587 \retval -10: unable to close device
589 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
590 const char* description, const char* serial, unsigned int index)
593 libusb_device **devs;
597 if (libusb_init(NULL) < 0)
598 ftdi_error_return(-11, "libusb_init() failed");
600 if (libusb_get_device_list(NULL, &devs) < 0)
601 ftdi_error_return(-12, "libusb_get_device_list() failed");
603 while ((dev = devs[i++]) != NULL)
605 struct libusb_device_descriptor desc;
607 if (libusb_get_device_descriptor(dev, &desc) < 0)
608 ftdi_error_return(-13, "libusb_get_device_descriptor() failed");
610 if (desc.idVendor == vendor && desc.idProduct == product)
612 if (libusb_open(dev, &ftdi->usb_dev) < 0)
613 ftdi_error_return(-4, "usb_open() failed");
615 if (description != NULL)
617 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
619 libusb_close (ftdi->usb_dev);
620 ftdi_error_return(-8, "unable to fetch product description");
622 if (strncmp(string, description, sizeof(string)) != 0)
624 libusb_close (ftdi->usb_dev);
630 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
632 ftdi_usb_close_internal (ftdi);
633 ftdi_error_return(-9, "unable to fetch serial number");
635 if (strncmp(string, serial, sizeof(string)) != 0)
637 ftdi_usb_close_internal (ftdi);
642 ftdi_usb_close_internal (ftdi);
650 return ftdi_usb_open_dev(ftdi, dev);
655 ftdi_error_return(-3, "device not found");
659 Opens the ftdi-device described by a description-string.
660 Intended to be used for parsing a device-description given as commandline argument.
662 \param ftdi pointer to ftdi_context
663 \param description NULL-terminated description-string, using this format:
664 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
665 \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")
666 \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
667 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
669 \note The description format may be extended in later versions.
672 \retval -1: libusb_init() failed
673 \retval -2: libusb_get_device_list() failed
674 \retval -3: usb device not found
675 \retval -4: unable to open device
676 \retval -5: unable to claim device
677 \retval -6: reset failed
678 \retval -7: set baudrate failed
679 \retval -8: get product description failed
680 \retval -9: get serial number failed
681 \retval -10: unable to close device
682 \retval -11: illegal description format
684 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
686 if (description[0] == 0 || description[1] != ':')
687 ftdi_error_return(-11, "illegal description format");
689 if (description[0] == 'd')
692 libusb_device **devs;
693 unsigned int bus_number, device_address;
696 if (libusb_init (NULL) < 0)
697 ftdi_error_return(-1, "libusb_init() failed");
699 if (libusb_get_device_list(NULL, &devs) < 0)
700 ftdi_error_return(-2, "libusb_get_device_list() failed");
702 /* XXX: This doesn't handle symlinks/odd paths/etc... */
703 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
704 ftdi_error_return(-11, "illegal description format");
706 while ((dev = devs[i++]) != NULL)
708 if (bus_number == libusb_get_bus_number (dev)
709 && device_address == libusb_get_device_address (dev))
710 return ftdi_usb_open_dev(ftdi, dev);
714 ftdi_error_return(-3, "device not found");
716 else if (description[0] == 'i' || description[0] == 's')
719 unsigned int product;
720 unsigned int index=0;
721 const char *serial=NULL;
722 const char *startp, *endp;
725 startp=description+2;
726 vendor=strtoul((char*)startp,(char**)&endp,0);
727 if (*endp != ':' || endp == startp || errno != 0)
728 ftdi_error_return(-11, "illegal description format");
731 product=strtoul((char*)startp,(char**)&endp,0);
732 if (endp == startp || errno != 0)
733 ftdi_error_return(-11, "illegal description format");
735 if (description[0] == 'i' && *endp != 0)
737 /* optional index field in i-mode */
739 ftdi_error_return(-11, "illegal description format");
742 index=strtoul((char*)startp,(char**)&endp,0);
743 if (*endp != 0 || endp == startp || errno != 0)
744 ftdi_error_return(-11, "illegal description format");
746 if (description[0] == 's')
749 ftdi_error_return(-11, "illegal description format");
751 /* rest of the description is the serial */
755 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
759 ftdi_error_return(-11, "illegal description format");
764 Resets the ftdi device.
766 \param ftdi pointer to ftdi_context
769 \retval -1: FTDI reset failed
771 int ftdi_usb_reset(struct ftdi_context *ftdi)
773 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
774 SIO_RESET_REQUEST, SIO_RESET_SIO,
775 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
776 ftdi_error_return(-1,"FTDI reset failed");
778 // Invalidate data in the readbuffer
779 ftdi->readbuffer_offset = 0;
780 ftdi->readbuffer_remaining = 0;
786 Clears the read buffer on the chip and the internal read buffer.
788 \param ftdi pointer to ftdi_context
791 \retval -1: read buffer purge failed
793 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
795 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
796 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
797 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
798 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
800 // Invalidate data in the readbuffer
801 ftdi->readbuffer_offset = 0;
802 ftdi->readbuffer_remaining = 0;
808 Clears the write buffer on the chip.
810 \param ftdi pointer to ftdi_context
813 \retval -1: write buffer purge failed
815 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
817 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
818 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
819 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
820 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
826 Clears the buffers on the chip and the internal read buffer.
828 \param ftdi pointer to ftdi_context
831 \retval -1: read buffer purge failed
832 \retval -2: write buffer purge failed
834 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
838 result = ftdi_usb_purge_rx_buffer(ftdi);
842 result = ftdi_usb_purge_tx_buffer(ftdi);
852 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
854 \param ftdi pointer to ftdi_context
857 \retval -1: usb_release failed
859 int ftdi_usb_close(struct ftdi_context *ftdi)
863 if (ftdi->usb_dev != NULL)
864 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
867 ftdi_usb_close_internal (ftdi);
873 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
874 Function is only used internally
877 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
878 unsigned short *value, unsigned short *index)
880 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
881 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
882 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
883 int divisor, best_divisor, best_baud, best_baud_diff;
884 unsigned long encoded_divisor;
893 divisor = 24000000 / baudrate;
895 if (ftdi->type == TYPE_AM)
897 // Round down to supported fraction (AM only)
898 divisor -= am_adjust_dn[divisor & 7];
901 // Try this divisor and the one above it (because division rounds down)
905 for (i = 0; i < 2; i++)
907 int try_divisor = divisor + i;
911 // Round up to supported divisor value
912 if (try_divisor <= 8)
914 // Round up to minimum supported divisor
917 else if (ftdi->type != TYPE_AM && try_divisor < 12)
919 // BM doesn't support divisors 9 through 11 inclusive
922 else if (divisor < 16)
924 // AM doesn't support divisors 9 through 15 inclusive
929 if (ftdi->type == TYPE_AM)
931 // Round up to supported fraction (AM only)
932 try_divisor += am_adjust_up[try_divisor & 7];
933 if (try_divisor > 0x1FFF8)
935 // Round down to maximum supported divisor value (for AM)
936 try_divisor = 0x1FFF8;
941 if (try_divisor > 0x1FFFF)
943 // Round down to maximum supported divisor value (for BM)
944 try_divisor = 0x1FFFF;
948 // Get estimated baud rate (to nearest integer)
949 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
950 // Get absolute difference from requested baud rate
951 if (baud_estimate < baudrate)
953 baud_diff = baudrate - baud_estimate;
957 baud_diff = baud_estimate - baudrate;
959 if (i == 0 || baud_diff < best_baud_diff)
961 // Closest to requested baud rate so far
962 best_divisor = try_divisor;
963 best_baud = baud_estimate;
964 best_baud_diff = baud_diff;
967 // Spot on! No point trying
972 // Encode the best divisor value
973 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
974 // Deal with special cases for encoded value
975 if (encoded_divisor == 1)
977 encoded_divisor = 0; // 3000000 baud
979 else if (encoded_divisor == 0x4001)
981 encoded_divisor = 1; // 2000000 baud (BM only)
983 // Split into "value" and "index" values
984 *value = (unsigned short)(encoded_divisor & 0xFFFF);
985 if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
987 *index = (unsigned short)(encoded_divisor >> 8);
989 *index |= ftdi->index;
992 *index = (unsigned short)(encoded_divisor >> 16);
994 // Return the nearest baud rate
999 Sets the chip baud rate
1001 \param ftdi pointer to ftdi_context
1002 \param baudrate baud rate to set
1005 \retval -1: invalid baudrate
1006 \retval -2: setting baudrate failed
1008 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1010 unsigned short value, index;
1011 int actual_baudrate;
1013 if (ftdi->bitbang_enabled)
1015 baudrate = baudrate*4;
1018 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1019 if (actual_baudrate <= 0)
1020 ftdi_error_return (-1, "Silly baudrate <= 0.");
1022 // Check within tolerance (about 5%)
1023 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1024 || ((actual_baudrate < baudrate)
1025 ? (actual_baudrate * 21 < baudrate * 20)
1026 : (baudrate * 21 < actual_baudrate * 20)))
1027 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1029 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1030 SIO_SET_BAUDRATE_REQUEST, value,
1031 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1032 ftdi_error_return (-2, "Setting new baudrate failed");
1034 ftdi->baudrate = baudrate;
1039 Set (RS232) line characteristics.
1040 The break type can only be set via ftdi_set_line_property2()
1041 and defaults to "off".
1043 \param ftdi pointer to ftdi_context
1044 \param bits Number of bits
1045 \param sbit Number of stop bits
1046 \param parity Parity mode
1049 \retval -1: Setting line property failed
1051 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1052 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1054 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1058 Set (RS232) line characteristics
1060 \param ftdi pointer to ftdi_context
1061 \param bits Number of bits
1062 \param sbit Number of stop bits
1063 \param parity Parity mode
1064 \param break_type Break type
1067 \retval -1: Setting line property failed
1069 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1070 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1071 enum ftdi_break_type break_type)
1073 unsigned short value = bits;
1078 value |= (0x00 << 8);
1081 value |= (0x01 << 8);
1084 value |= (0x02 << 8);
1087 value |= (0x03 << 8);
1090 value |= (0x04 << 8);
1097 value |= (0x00 << 11);
1100 value |= (0x01 << 11);
1103 value |= (0x02 << 11);
1110 value |= (0x00 << 14);
1113 value |= (0x01 << 14);
1117 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1118 SIO_SET_DATA_REQUEST, value,
1119 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1120 ftdi_error_return (-1, "Setting new line property failed");
1126 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1128 \param ftdi pointer to ftdi_context
1129 \param buf Buffer with the data
1130 \param size Size of the buffer
1132 \retval <0: error code from usb_bulk_write()
1133 \retval >0: number of bytes written
1135 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1140 while (offset < size)
1142 int write_size = ftdi->writebuffer_chunksize;
1144 if (offset+write_size > size)
1145 write_size = size-offset;
1147 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1148 ftdi_error_return(-1, "usb bulk write failed");
1150 offset += actual_length;
1156 #ifdef LIBFTDI_LINUX_ASYNC_MODE
1157 #ifdef USB_CLASS_PTP
1158 #error LIBFTDI_LINUX_ASYNC_MODE is not compatible with libusb-compat-0.1!
1160 static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1162 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1163 struct ftdi_context *ftdi = tc->ftdi;
1164 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1166 packet_size = ftdi->max_packet_size;
1168 actual_length = transfer->actual_length;
1170 if (actual_length > 2)
1172 // skip FTDI status bytes.
1173 // Maybe stored in the future to enable modem use
1174 num_of_chunks = actual_length / packet_size;
1175 chunk_remains = actual_length % packet_size;
1176 //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);
1178 ftdi->readbuffer_offset += 2;
1181 if (actual_length > packet_size - 2)
1183 for (i = 1; i < num_of_chunks; i++)
1184 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1185 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1187 if (chunk_remains > 2)
1189 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1190 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1192 actual_length -= 2*num_of_chunks;
1195 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1198 if (actual_length > 0)
1200 // data still fits in buf?
1201 if (tc->offset + actual_length <= tc->size)
1203 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1204 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1205 tc->offset += actual_length;
1207 ftdi->readbuffer_offset = 0;
1208 ftdi->readbuffer_remaining = 0;
1210 /* Did we read exactly the right amount of bytes? */
1211 if (tc->offset == tc->size)
1213 //printf("read_data exact rem %d offset %d\n",
1214 //ftdi->readbuffer_remaining, offset);
1221 // only copy part of the data or size <= readbuffer_chunksize
1222 int part_size = tc->size - tc->offset;
1223 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1224 tc->offset += part_size;
1226 ftdi->readbuffer_offset += part_size;
1227 ftdi->readbuffer_remaining = actual_length - part_size;
1229 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1230 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1236 ret = libusb_submit_transfer (transfer);
1242 static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1244 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1245 struct ftdi_context *ftdi = tc->ftdi;
1247 tc->offset = transfer->actual_length;
1249 if (tc->offset == tc->size)
1255 int write_size = ftdi->writebuffer_chunksize;
1258 if (tc->offset + write_size > tc->size)
1259 write_size = tc->size - tc->offset;
1261 transfer->length = write_size;
1262 transfer->buffer = tc->buf + tc->offset;
1263 ret = libusb_submit_transfer (transfer);
1271 Writes data to the chip. Does not wait for completion of the transfer
1272 nor does it make sure that the transfer was successful.
1274 Use libusb 1.0 Asynchronous API.
1275 Only available if compiled with --with-async-mode.
1277 \param ftdi pointer to ftdi_context
1278 \param buf Buffer with the data
1279 \param size Size of the buffer
1281 \retval NULL: Some error happens when submit transfer
1282 \retval !NULL: Pointer to a ftdi_transfer_control
1285 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1287 struct ftdi_transfer_control *tc;
1288 struct libusb_transfer *transfer = libusb_alloc_transfer(0);
1289 int write_size, ret;
1291 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1293 if (!tc || !transfer)
1302 if (size < ftdi->writebuffer_chunksize)
1305 write_size = ftdi->writebuffer_chunksize;
1307 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf, write_size, ftdi_write_data_cb, tc, ftdi->usb_write_timeout);
1308 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1310 ret = libusb_submit_transfer(transfer);
1313 libusb_free_transfer(transfer);
1315 tc->transfer = NULL;
1318 tc->transfer = transfer;
1324 Reads data from the chip. Does not wait for completion of the transfer
1325 nor does it make sure that the transfer was successful.
1327 Use libusb 1.0 Asynchronous API.
1328 Only available if compiled with --with-async-mode.
1330 \param ftdi pointer to ftdi_context
1331 \param buf Buffer with the data
1332 \param size Size of the buffer
1334 \retval NULL: Some error happens when submit transfer
1335 \retval !NULL: Pointer to a ftdi_transfer_control
1338 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1340 struct ftdi_transfer_control *tc;
1341 struct libusb_transfer *transfer;
1344 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1352 if (size <= ftdi->readbuffer_remaining)
1354 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1357 ftdi->readbuffer_remaining -= size;
1358 ftdi->readbuffer_offset += size;
1360 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1364 tc->transfer = NULL;
1369 if (ftdi->readbuffer_remaining != 0)
1371 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1373 tc->offset = ftdi->readbuffer_remaining;
1378 transfer = libusb_alloc_transfer(0);
1385 ftdi->readbuffer_remaining = 0;
1386 ftdi->readbuffer_offset = 0;
1388 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);
1389 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1391 ret = libusb_submit_transfer(transfer);
1394 libusb_free_transfer(transfer);
1398 tc->transfer = transfer;
1404 Wait for completion of the transfer.
1406 Use libusb 1.0 Asynchronous API.
1407 Only available if compiled with --with-async-mode.
1409 \param tc pointer to ftdi_transfer_control
1411 \retval < 0: Some error happens
1412 \retval >= 0: Data size transferred
1415 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1419 while (!tc->completed)
1421 ret = libusb_handle_events(NULL);
1424 if (ret == LIBUSB_ERROR_INTERRUPTED)
1426 libusb_cancel_transfer(tc->transfer);
1427 while (!tc->completed)
1428 if (libusb_handle_events(NULL) < 0)
1430 libusb_free_transfer(tc->transfer);
1437 if (tc->transfer->status == LIBUSB_TRANSFER_COMPLETED)
1442 libusb_free_transfer(tc->transfer);
1447 #endif // LIBFTDI_LINUX_ASYNC_MODE
1450 Configure write buffer chunk size.
1453 \param ftdi pointer to ftdi_context
1454 \param chunksize Chunk size
1458 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1460 ftdi->writebuffer_chunksize = chunksize;
1465 Get write buffer chunk size.
1467 \param ftdi pointer to ftdi_context
1468 \param chunksize Pointer to store chunk size in
1472 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1474 *chunksize = ftdi->writebuffer_chunksize;
1479 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1481 Automatically strips the two modem status bytes transfered during every read.
1483 \param ftdi pointer to ftdi_context
1484 \param buf Buffer to store data in
1485 \param size Size of the buffer
1487 \retval <0: error code from libusb_bulk_transfer()
1488 \retval 0: no data was available
1489 \retval >0: number of bytes read
1492 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1494 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1495 int packet_size = ftdi->max_packet_size;
1496 int actual_length = 1;
1498 // Packet size sanity check (avoid division by zero)
1499 if (packet_size == 0)
1500 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1502 // everything we want is still in the readbuffer?
1503 if (size <= ftdi->readbuffer_remaining)
1505 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1508 ftdi->readbuffer_remaining -= size;
1509 ftdi->readbuffer_offset += size;
1511 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1515 // something still in the readbuffer, but not enough to satisfy 'size'?
1516 if (ftdi->readbuffer_remaining != 0)
1518 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1521 offset += ftdi->readbuffer_remaining;
1523 // do the actual USB read
1524 while (offset < size && actual_length > 0)
1526 ftdi->readbuffer_remaining = 0;
1527 ftdi->readbuffer_offset = 0;
1528 /* returns how much received */
1529 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1531 ftdi_error_return(ret, "usb bulk read failed");
1533 if (actual_length > 2)
1535 // skip FTDI status bytes.
1536 // Maybe stored in the future to enable modem use
1537 num_of_chunks = actual_length / packet_size;
1538 chunk_remains = actual_length % packet_size;
1539 //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);
1541 ftdi->readbuffer_offset += 2;
1544 if (actual_length > packet_size - 2)
1546 for (i = 1; i < num_of_chunks; i++)
1547 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1548 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1550 if (chunk_remains > 2)
1552 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1553 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1555 actual_length -= 2*num_of_chunks;
1558 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1561 else if (actual_length <= 2)
1563 // no more data to read?
1566 if (actual_length > 0)
1568 // data still fits in buf?
1569 if (offset+actual_length <= size)
1571 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1572 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1573 offset += actual_length;
1575 /* Did we read exactly the right amount of bytes? */
1577 //printf("read_data exact rem %d offset %d\n",
1578 //ftdi->readbuffer_remaining, offset);
1583 // only copy part of the data or size <= readbuffer_chunksize
1584 int part_size = size-offset;
1585 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1587 ftdi->readbuffer_offset += part_size;
1588 ftdi->readbuffer_remaining = actual_length-part_size;
1589 offset += part_size;
1591 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1592 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1603 Configure read buffer chunk size.
1606 Automatically reallocates the buffer.
1608 \param ftdi pointer to ftdi_context
1609 \param chunksize Chunk size
1613 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1615 unsigned char *new_buf;
1617 // Invalidate all remaining data
1618 ftdi->readbuffer_offset = 0;
1619 ftdi->readbuffer_remaining = 0;
1621 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1622 which is defined in libusb-1.0. Otherwise, each USB read request will
1623 be divided into multiple URBs. This will cause issues on Linux kernel
1624 older than 2.6.32. */
1625 if (chunksize > 16384)
1629 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1630 ftdi_error_return(-1, "out of memory for readbuffer");
1632 ftdi->readbuffer = new_buf;
1633 ftdi->readbuffer_chunksize = chunksize;
1639 Get read buffer chunk size.
1641 \param ftdi pointer to ftdi_context
1642 \param chunksize Pointer to store chunk size in
1646 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1648 *chunksize = ftdi->readbuffer_chunksize;
1654 Enable bitbang mode.
1656 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1658 \param ftdi pointer to ftdi_context
1659 \param bitmask Bitmask to configure lines.
1660 HIGH/ON value configures a line as output.
1663 \retval -1: can't enable bitbang mode
1665 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1667 unsigned short usb_val;
1669 usb_val = bitmask; // low byte: bitmask
1670 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1671 usb_val |= (ftdi->bitbang_mode << 8);
1673 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1674 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1675 NULL, 0, ftdi->usb_write_timeout) < 0)
1676 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1678 ftdi->bitbang_enabled = 1;
1683 Disable bitbang mode.
1685 \param ftdi pointer to ftdi_context
1688 \retval -1: can't disable bitbang mode
1690 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1692 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)
1693 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1695 ftdi->bitbang_enabled = 0;
1700 Enable/disable bitbang modes.
1702 \param ftdi pointer to ftdi_context
1703 \param bitmask Bitmask to configure lines.
1704 HIGH/ON value configures a line as output.
1705 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1708 \retval -1: can't enable bitbang mode
1710 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1712 unsigned short usb_val;
1714 usb_val = bitmask; // low byte: bitmask
1715 usb_val |= (mode << 8);
1716 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)
1717 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?");
1719 ftdi->bitbang_mode = mode;
1720 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1725 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1727 \param ftdi pointer to ftdi_context
1728 \param pins Pointer to store pins into
1731 \retval -1: read pins failed
1733 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1735 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)
1736 ftdi_error_return(-1, "read pins failed");
1744 The FTDI chip keeps data in the internal buffer for a specific
1745 amount of time if the buffer is not full yet to decrease
1746 load on the usb bus.
1748 \param ftdi pointer to ftdi_context
1749 \param latency Value between 1 and 255
1752 \retval -1: latency out of range
1753 \retval -2: unable to set latency timer
1755 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1757 unsigned short usb_val;
1760 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1763 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)
1764 ftdi_error_return(-2, "unable to set latency timer");
1772 \param ftdi pointer to ftdi_context
1773 \param latency Pointer to store latency value in
1776 \retval -1: unable to get latency timer
1778 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
1780 unsigned short usb_val;
1781 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)
1782 ftdi_error_return(-1, "reading latency timer failed");
1784 *latency = (unsigned char)usb_val;
1789 Poll modem status information
1791 This function allows the retrieve the two status bytes of the device.
1792 The device sends these bytes also as a header for each read access
1793 where they are discarded by ftdi_read_data(). The chip generates
1794 the two stripped status bytes in the absence of data every 40 ms.
1796 Layout of the first byte:
1797 - B0..B3 - must be 0
1798 - B4 Clear to send (CTS)
1801 - B5 Data set ready (DTS)
1804 - B6 Ring indicator (RI)
1807 - B7 Receive line signal detect (RLSD)
1811 Layout of the second byte:
1812 - B0 Data ready (DR)
1813 - B1 Overrun error (OE)
1814 - B2 Parity error (PE)
1815 - B3 Framing error (FE)
1816 - B4 Break interrupt (BI)
1817 - B5 Transmitter holding register (THRE)
1818 - B6 Transmitter empty (TEMT)
1819 - B7 Error in RCVR FIFO
1821 \param ftdi pointer to ftdi_context
1822 \param status Pointer to store status information in. Must be two bytes.
1825 \retval -1: unable to retrieve status information
1827 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
1831 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)
1832 ftdi_error_return(-1, "getting modem status failed");
1834 *status = (usb_val[1] << 8) | usb_val[0];
1840 Set flowcontrol for ftdi chip
1842 \param ftdi pointer to ftdi_context
1843 \param flowctrl flow control to use. should be
1844 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
1847 \retval -1: set flow control failed
1849 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
1851 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1852 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
1853 NULL, 0, ftdi->usb_write_timeout) < 0)
1854 ftdi_error_return(-1, "set flow control failed");
1862 \param ftdi pointer to ftdi_context
1863 \param state state to set line to (1 or 0)
1866 \retval -1: set dtr failed
1868 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
1870 unsigned short usb_val;
1873 usb_val = SIO_SET_DTR_HIGH;
1875 usb_val = SIO_SET_DTR_LOW;
1877 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1878 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
1879 NULL, 0, ftdi->usb_write_timeout) < 0)
1880 ftdi_error_return(-1, "set dtr failed");
1888 \param ftdi pointer to ftdi_context
1889 \param state state to set line to (1 or 0)
1892 \retval -1 set rts failed
1894 int ftdi_setrts(struct ftdi_context *ftdi, int state)
1896 unsigned short usb_val;
1899 usb_val = SIO_SET_RTS_HIGH;
1901 usb_val = SIO_SET_RTS_LOW;
1903 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1904 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
1905 NULL, 0, ftdi->usb_write_timeout) < 0)
1906 ftdi_error_return(-1, "set of rts failed");
1912 Set dtr and rts line in one pass
1914 \param ftdi pointer to ftdi_context
1915 \param dtr DTR state to set line to (1 or 0)
1916 \param rts RTS state to set line to (1 or 0)
1919 \retval -1 set dtr/rts failed
1921 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
1923 unsigned short usb_val;
1926 usb_val = SIO_SET_DTR_HIGH;
1928 usb_val = SIO_SET_DTR_LOW;
1931 usb_val |= SIO_SET_RTS_HIGH;
1933 usb_val |= SIO_SET_RTS_LOW;
1935 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1936 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
1937 NULL, 0, ftdi->usb_write_timeout) < 0)
1938 ftdi_error_return(-1, "set of rts/dtr failed");
1944 Set the special event character
1946 \param ftdi pointer to ftdi_context
1947 \param eventch Event character
1948 \param enable 0 to disable the event character, non-zero otherwise
1951 \retval -1: unable to set event character
1953 int ftdi_set_event_char(struct ftdi_context *ftdi,
1954 unsigned char eventch, unsigned char enable)
1956 unsigned short usb_val;
1962 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)
1963 ftdi_error_return(-1, "setting event character failed");
1971 \param ftdi pointer to ftdi_context
1972 \param errorch Error character
1973 \param enable 0 to disable the error character, non-zero otherwise
1976 \retval -1: unable to set error character
1978 int ftdi_set_error_char(struct ftdi_context *ftdi,
1979 unsigned char errorch, unsigned char enable)
1981 unsigned short usb_val;
1987 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)
1988 ftdi_error_return(-1, "setting error character failed");
1996 \param ftdi pointer to ftdi_context
1997 \param eeprom Pointer to ftdi_eeprom
2001 void ftdi_eeprom_setsize(struct ftdi_context *ftdi, struct ftdi_eeprom *eeprom, int size)
2003 ftdi->eeprom_size=size;
2008 Init eeprom with default values.
2010 \param eeprom Pointer to ftdi_eeprom
2012 void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom)
2014 eeprom->vendor_id = 0x0403;
2015 eeprom->product_id = 0x6001;
2017 eeprom->self_powered = 1;
2018 eeprom->remote_wakeup = 1;
2019 eeprom->BM_type_chip = 1;
2021 eeprom->in_is_isochronous = 0;
2022 eeprom->out_is_isochronous = 0;
2023 eeprom->suspend_pull_downs = 0;
2025 eeprom->use_serial = 0;
2026 eeprom->change_usb_version = 0;
2027 eeprom->usb_version = 0x0200;
2028 eeprom->max_power = 0;
2030 eeprom->manufacturer = NULL;
2031 eeprom->product = NULL;
2032 eeprom->serial = NULL;
2034 eeprom->size = FTDI_DEFAULT_EEPROM_SIZE;
2038 Build binary output from ftdi_eeprom structure.
2039 Output is suitable for ftdi_write_eeprom().
2041 \param eeprom Pointer to ftdi_eeprom
2042 \param output Buffer of 128 bytes to store eeprom image to
2044 \retval >0: used eeprom size
2045 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2047 int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output)
2050 unsigned short checksum, value;
2051 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2054 if (eeprom->manufacturer != NULL)
2055 manufacturer_size = strlen(eeprom->manufacturer);
2056 if (eeprom->product != NULL)
2057 product_size = strlen(eeprom->product);
2058 if (eeprom->serial != NULL)
2059 serial_size = strlen(eeprom->serial);
2061 size_check = eeprom->size;
2062 size_check -= 28; // 28 are always in use (fixed)
2064 // Top half of a 256byte eeprom is used just for strings and checksum
2065 // it seems that the FTDI chip will not read these strings from the lower half
2066 // Each string starts with two bytes; offset and type (0x03 for string)
2067 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2068 if (eeprom->size>=256)size_check = 120;
2069 size_check -= manufacturer_size*2;
2070 size_check -= product_size*2;
2071 size_check -= serial_size*2;
2073 // eeprom size exceeded?
2078 memset (output, 0, eeprom->size);
2080 // Addr 00: Stay 00 00
2081 // Addr 02: Vendor ID
2082 output[0x02] = eeprom->vendor_id;
2083 output[0x03] = eeprom->vendor_id >> 8;
2085 // Addr 04: Product ID
2086 output[0x04] = eeprom->product_id;
2087 output[0x05] = eeprom->product_id >> 8;
2089 // Addr 06: Device release number (0400h for BM features)
2090 output[0x06] = 0x00;
2092 if (eeprom->BM_type_chip == 1)
2093 output[0x07] = 0x04;
2095 output[0x07] = 0x02;
2097 // Addr 08: Config descriptor
2099 // Bit 6: 1 if this device is self powered, 0 if bus powered
2100 // Bit 5: 1 if this device uses remote wakeup
2101 // Bit 4: 1 if this device is battery powered
2103 if (eeprom->self_powered == 1)
2105 if (eeprom->remote_wakeup == 1)
2109 // Addr 09: Max power consumption: max power = value * 2 mA
2110 output[0x09] = eeprom->max_power;
2112 // Addr 0A: Chip configuration
2113 // Bit 7: 0 - reserved
2114 // Bit 6: 0 - reserved
2115 // Bit 5: 0 - reserved
2116 // Bit 4: 1 - Change USB version
2117 // Bit 3: 1 - Use the serial number string
2118 // Bit 2: 1 - Enable suspend pull downs for lower power
2119 // Bit 1: 1 - Out EndPoint is Isochronous
2120 // Bit 0: 1 - In EndPoint is Isochronous
2123 if (eeprom->in_is_isochronous == 1)
2125 if (eeprom->out_is_isochronous == 1)
2127 if (eeprom->suspend_pull_downs == 1)
2129 if (eeprom->use_serial == 1)
2131 if (eeprom->change_usb_version == 1)
2135 // Addr 0B: reserved
2136 output[0x0B] = 0x00;
2138 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2139 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2140 if (eeprom->change_usb_version == 1)
2142 output[0x0C] = eeprom->usb_version;
2143 output[0x0D] = eeprom->usb_version >> 8;
2147 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2148 // Addr 0F: Length of manufacturer string
2149 output[0x0F] = manufacturer_size*2 + 2;
2151 // Addr 10: Offset of the product string + 0x80, calculated later
2152 // Addr 11: Length of product string
2153 output[0x11] = product_size*2 + 2;
2155 // Addr 12: Offset of the serial string + 0x80, calculated later
2156 // Addr 13: Length of serial string
2157 output[0x13] = serial_size*2 + 2;
2161 if (eeprom->size>=256) i = 0x80;
2164 // Output manufacturer
2165 output[0x0E] = i | 0x80; // calculate offset
2166 output[i++] = manufacturer_size*2 + 2;
2167 output[i++] = 0x03; // type: string
2168 for (j = 0; j < manufacturer_size; j++)
2170 output[i] = eeprom->manufacturer[j], i++;
2171 output[i] = 0x00, i++;
2174 // Output product name
2175 output[0x10] = i | 0x80; // calculate offset
2176 output[i] = product_size*2 + 2, i++;
2177 output[i] = 0x03, i++;
2178 for (j = 0; j < product_size; j++)
2180 output[i] = eeprom->product[j], i++;
2181 output[i] = 0x00, i++;
2185 output[0x12] = i | 0x80; // calculate offset
2186 output[i] = serial_size*2 + 2, i++;
2187 output[i] = 0x03, i++;
2188 for (j = 0; j < serial_size; j++)
2190 output[i] = eeprom->serial[j], i++;
2191 output[i] = 0x00, i++;
2194 // calculate checksum
2197 for (i = 0; i < eeprom->size/2-1; i++)
2199 value = output[i*2];
2200 value += output[(i*2)+1] << 8;
2202 checksum = value^checksum;
2203 checksum = (checksum << 1) | (checksum >> 15);
2206 output[eeprom->size-2] = checksum;
2207 output[eeprom->size-1] = checksum >> 8;
2213 Decode binary EEPROM image into an ftdi_eeprom structure.
2215 \param eeprom Pointer to ftdi_eeprom which will be filled in.
2216 \param buf Buffer of \a size bytes of raw eeprom data
2217 \param size size size of eeprom data in bytes
2220 \retval -1: something went wrong
2222 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2223 FIXME: Strings are malloc'ed here and should be freed somewhere
2225 int ftdi_eeprom_decode(struct ftdi_eeprom *eeprom, unsigned char *buf, int size)
2228 unsigned short checksum, eeprom_checksum, value;
2229 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2230 int eeprom_size = 128;
2232 size_check = eeprom->size;
2233 size_check -= 28; // 28 are always in use (fixed)
2235 // Top half of a 256byte eeprom is used just for strings and checksum
2236 // it seems that the FTDI chip will not read these strings from the lower half
2237 // Each string starts with two bytes; offset and type (0x03 for string)
2238 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2239 if (eeprom->size>=256)size_check = 120;
2240 size_check -= manufacturer_size*2;
2241 size_check -= product_size*2;
2242 size_check -= serial_size*2;
2244 // eeprom size exceeded?
2249 // empty eeprom struct
2250 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2252 // Addr 00: Stay 00 00
2254 // Addr 02: Vendor ID
2255 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2257 // Addr 04: Product ID
2258 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2260 value = buf[0x06] + (buf[0x07]<<8);
2264 eeprom->BM_type_chip = 1;
2267 eeprom->BM_type_chip = 0;
2269 default: // Unknown device
2270 eeprom->BM_type_chip = 0;
2274 // Addr 08: Config descriptor
2276 // Bit 6: 1 if this device is self powered, 0 if bus powered
2277 // Bit 5: 1 if this device uses remote wakeup
2278 // Bit 4: 1 if this device is battery powered
2280 if (j&0x40) eeprom->self_powered = 1;
2281 if (j&0x20) eeprom->remote_wakeup = 1;
2283 // Addr 09: Max power consumption: max power = value * 2 mA
2284 eeprom->max_power = buf[0x09];
2286 // Addr 0A: Chip configuration
2287 // Bit 7: 0 - reserved
2288 // Bit 6: 0 - reserved
2289 // Bit 5: 0 - reserved
2290 // Bit 4: 1 - Change USB version
2291 // Bit 3: 1 - Use the serial number string
2292 // Bit 2: 1 - Enable suspend pull downs for lower power
2293 // Bit 1: 1 - Out EndPoint is Isochronous
2294 // Bit 0: 1 - In EndPoint is Isochronous
2297 if (j&0x01) eeprom->in_is_isochronous = 1;
2298 if (j&0x02) eeprom->out_is_isochronous = 1;
2299 if (j&0x04) eeprom->suspend_pull_downs = 1;
2300 if (j&0x08) eeprom->use_serial = 1;
2301 if (j&0x10) eeprom->change_usb_version = 1;
2303 // Addr 0B: reserved
2305 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2306 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2307 if (eeprom->change_usb_version == 1)
2309 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2312 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2313 // Addr 0F: Length of manufacturer string
2314 manufacturer_size = buf[0x0F]/2;
2315 if (manufacturer_size > 0) eeprom->manufacturer = malloc(manufacturer_size);
2316 else eeprom->manufacturer = NULL;
2318 // Addr 10: Offset of the product string + 0x80, calculated later
2319 // Addr 11: Length of product string
2320 product_size = buf[0x11]/2;
2321 if (product_size > 0) eeprom->product = malloc(product_size);
2322 else eeprom->product = NULL;
2324 // Addr 12: Offset of the serial string + 0x80, calculated later
2325 // Addr 13: Length of serial string
2326 serial_size = buf[0x13]/2;
2327 if (serial_size > 0) eeprom->serial = malloc(serial_size);
2328 else eeprom->serial = NULL;
2330 // Decode manufacturer
2331 i = buf[0x0E] & 0x7f; // offset
2332 for (j=0;j<manufacturer_size-1;j++)
2334 eeprom->manufacturer[j] = buf[2*j+i+2];
2336 eeprom->manufacturer[j] = '\0';
2338 // Decode product name
2339 i = buf[0x10] & 0x7f; // offset
2340 for (j=0;j<product_size-1;j++)
2342 eeprom->product[j] = buf[2*j+i+2];
2344 eeprom->product[j] = '\0';
2347 i = buf[0x12] & 0x7f; // offset
2348 for (j=0;j<serial_size-1;j++)
2350 eeprom->serial[j] = buf[2*j+i+2];
2352 eeprom->serial[j] = '\0';
2357 for (i = 0; i < eeprom_size/2-1; i++)
2360 value += buf[(i*2)+1] << 8;
2362 checksum = value^checksum;
2363 checksum = (checksum << 1) | (checksum >> 15);
2366 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
2368 if (eeprom_checksum != checksum)
2370 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
2378 Read eeprom location
2380 \param ftdi pointer to ftdi_context
2381 \param eeprom_addr Address of eeprom location to be read
2382 \param eeprom_val Pointer to store read eeprom location
2385 \retval -1: read failed
2387 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
2389 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, eeprom_addr, (char *)eeprom_val, 2, ftdi->usb_read_timeout) != 2)
2390 ftdi_error_return(-1, "reading eeprom failed");
2398 \param ftdi pointer to ftdi_context
2399 \param eeprom Pointer to store eeprom into
2402 \retval -1: read failed
2404 int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2408 for (i = 0; i < ftdi->eeprom_size/2; i++)
2410 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2411 ftdi_error_return(-1, "reading eeprom failed");
2418 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
2419 Function is only used internally
2422 static unsigned char ftdi_read_chipid_shift(unsigned char value)
2424 return ((value & 1) << 1) |
2425 ((value & 2) << 5) |
2426 ((value & 4) >> 2) |
2427 ((value & 8) << 4) |
2428 ((value & 16) >> 1) |
2429 ((value & 32) >> 1) |
2430 ((value & 64) >> 4) |
2431 ((value & 128) >> 2);
2435 Read the FTDIChip-ID from R-type devices
2437 \param ftdi pointer to ftdi_context
2438 \param chipid Pointer to store FTDIChip-ID
2441 \retval -1: read failed
2443 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
2445 unsigned int a = 0, b = 0;
2447 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)
2449 a = a << 8 | a >> 8;
2450 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)
2452 b = b << 8 | b >> 8;
2453 a = (a << 16) | (b & 0xFFFF);
2454 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
2455 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
2456 *chipid = a ^ 0xa5f0f7d1;
2461 ftdi_error_return(-1, "read of FTDIChip-ID failed");
2465 Guesses size of eeprom by reading eeprom and comparing halves - will not work with blank eeprom
2466 Call this function then do a write then call again to see if size changes, if so write again.
2468 \param ftdi pointer to ftdi_context
2469 \param eeprom Pointer to store eeprom into
2470 \param maxsize the size of the buffer to read into
2472 \retval size of eeprom
2474 int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize)
2476 int i=0,j,minsize=32;
2481 for (j = 0; i < maxsize/2 && j<size; j++)
2483 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,
2484 SIO_READ_EEPROM_REQUEST, 0, i,
2485 eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2486 ftdi_error_return(-1, "reading eeprom failed");
2491 while (size<=maxsize && memcmp(eeprom,&eeprom[size/2],size/2)!=0);
2497 Write eeprom location
2499 \param ftdi pointer to ftdi_context
2500 \param eeprom_addr Address of eeprom location to be written
2501 \param eeprom_val Value to be written
2504 \retval -1: read failed
2506 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr, unsigned short eeprom_val)
2508 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2509 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
2510 NULL, 0, ftdi->usb_write_timeout) != 0)
2511 ftdi_error_return(-1, "unable to write eeprom");
2519 \param ftdi pointer to ftdi_context
2520 \param eeprom Pointer to read eeprom from
2523 \retval -1: read failed
2525 int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2527 unsigned short usb_val, status;
2530 /* These commands were traced while running MProg */
2531 if ((ret = ftdi_usb_reset(ftdi)) != 0)
2533 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
2535 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
2538 for (i = 0; i < ftdi->eeprom_size/2; i++)
2540 usb_val = eeprom[i*2];
2541 usb_val += eeprom[(i*2)+1] << 8;
2542 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2543 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
2544 NULL, 0, ftdi->usb_write_timeout) < 0)
2545 ftdi_error_return(-1, "unable to write eeprom");
2554 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
2556 \param ftdi pointer to ftdi_context
2559 \retval -1: erase failed
2561 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
2563 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST, 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
2564 ftdi_error_return(-1, "unable to erase eeprom");
2570 Get string representation for last error code
2572 \param ftdi pointer to ftdi_context
2574 \retval Pointer to error string
2576 char *ftdi_get_error_string (struct ftdi_context *ftdi)
2578 return ftdi->error_str;
2581 /* @} end of doxygen libftdi group */