1 /***************************************************************************
5 copyright : (C) 2003-2010 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; \
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);
70 Initializes a ftdi_context.
72 \param ftdi pointer to ftdi_context
75 \retval -1: couldn't allocate read buffer
77 \remark This should be called before all functions
79 int ftdi_init(struct ftdi_context *ftdi)
83 ftdi->usb_read_timeout = 5000;
84 ftdi->usb_write_timeout = 5000;
86 ftdi->type = TYPE_BM; /* chip type */
88 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
90 ftdi->readbuffer = NULL;
91 ftdi->readbuffer_offset = 0;
92 ftdi->readbuffer_remaining = 0;
93 ftdi->writebuffer_chunksize = 4096;
94 ftdi->max_packet_size = 0;
100 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
102 ftdi->error_str = NULL;
104 ftdi->eeprom_size = FTDI_DEFAULT_EEPROM_SIZE;
106 /* All fine. Now allocate the readbuffer */
107 return ftdi_read_data_set_chunksize(ftdi, 4096);
111 Allocate and initialize a new ftdi_context
113 \return a pointer to a new ftdi_context, or NULL on failure
115 struct ftdi_context *ftdi_new(void)
117 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
124 if (ftdi_init(ftdi) != 0)
134 Open selected channels on a chip, otherwise use first channel.
136 \param ftdi pointer to ftdi_context
137 \param interface Interface to use for FT2232C/2232H/4232H chips.
140 \retval -1: unknown interface
141 \retval -2: USB device unavailable
143 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
146 ftdi_error_return(-2, "USB device unavailable");
152 /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */
156 ftdi->index = INTERFACE_B;
162 ftdi->index = INTERFACE_C;
168 ftdi->index = INTERFACE_D;
173 ftdi_error_return(-1, "Unknown interface");
179 Deinitializes a ftdi_context.
181 \param ftdi pointer to ftdi_context
183 void ftdi_deinit(struct ftdi_context *ftdi)
188 ftdi_usb_close_internal (ftdi);
190 if (ftdi->readbuffer != NULL)
192 free(ftdi->readbuffer);
193 ftdi->readbuffer = NULL;
195 libusb_exit(ftdi->usb_ctx);
199 Deinitialize and free an ftdi_context.
201 \param ftdi pointer to ftdi_context
203 void ftdi_free(struct ftdi_context *ftdi)
210 Use an already open libusb device.
212 \param ftdi pointer to ftdi_context
213 \param usb libusb libusb_device_handle to use
215 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
225 Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which
226 needs to be deallocated by ftdi_list_free() after use.
228 \param ftdi pointer to ftdi_context
229 \param devlist Pointer where to store list of found devices
230 \param vendor Vendor ID to search for
231 \param product Product ID to search for
233 \retval >0: number of devices found
234 \retval -3: out of memory
235 \retval -4: libusb_init() failed
236 \retval -5: libusb_get_device_list() failed
237 \retval -6: libusb_get_device_descriptor() failed
239 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
241 struct ftdi_device_list **curdev;
243 libusb_device **devs;
247 if (libusb_init(&ftdi->usb_ctx) < 0)
248 ftdi_error_return(-4, "libusb_init() failed");
250 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
251 ftdi_error_return(-5, "libusb_get_device_list() failed");
256 while ((dev = devs[i++]) != NULL)
258 struct libusb_device_descriptor desc;
260 if (libusb_get_device_descriptor(dev, &desc) < 0)
261 ftdi_error_return(-6, "libusb_get_device_descriptor() failed");
263 if (desc.idVendor == vendor && desc.idProduct == product)
265 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
267 ftdi_error_return(-3, "out of memory");
269 (*curdev)->next = NULL;
270 (*curdev)->dev = dev;
272 curdev = &(*curdev)->next;
281 Frees a usb device list.
283 \param devlist USB device list created by ftdi_usb_find_all()
285 void ftdi_list_free(struct ftdi_device_list **devlist)
287 struct ftdi_device_list *curdev, *next;
289 for (curdev = *devlist; curdev != NULL;)
300 Frees a usb device list.
302 \param devlist USB device list created by ftdi_usb_find_all()
304 void ftdi_list_free2(struct ftdi_device_list *devlist)
306 ftdi_list_free(&devlist);
310 Return device ID strings from the usb device.
312 The parameters manufacturer, description and serial may be NULL
313 or pointer to buffers to store the fetched strings.
315 \note Use this function only in combination with ftdi_usb_find_all()
316 as it closes the internal "usb_dev" after use.
318 \param ftdi pointer to ftdi_context
319 \param dev libusb usb_dev to use
320 \param manufacturer Store manufacturer string here if not NULL
321 \param mnf_len Buffer size of manufacturer string
322 \param description Store product description string here if not NULL
323 \param desc_len Buffer size of product description string
324 \param serial Store serial string here if not NULL
325 \param serial_len Buffer size of serial string
328 \retval -1: wrong arguments
329 \retval -4: unable to open device
330 \retval -7: get product manufacturer failed
331 \retval -8: get product description failed
332 \retval -9: get serial number failed
333 \retval -11: libusb_get_device_descriptor() failed
335 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
336 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
338 struct libusb_device_descriptor desc;
340 if ((ftdi==NULL) || (dev==NULL))
343 if (libusb_open(dev, &ftdi->usb_dev) < 0)
344 ftdi_error_return(-4, "libusb_open() failed");
346 if (libusb_get_device_descriptor(dev, &desc) < 0)
347 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
349 if (manufacturer != NULL)
351 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
353 ftdi_usb_close_internal (ftdi);
354 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
358 if (description != NULL)
360 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
362 ftdi_usb_close_internal (ftdi);
363 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
369 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
371 ftdi_usb_close_internal (ftdi);
372 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
376 ftdi_usb_close_internal (ftdi);
382 * Internal function to determine the maximum packet size.
383 * \param ftdi pointer to ftdi_context
384 * \param dev libusb usb_dev to use
385 * \retval Maximum packet size for this device
387 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
389 struct libusb_device_descriptor desc;
390 struct libusb_config_descriptor *config0;
391 unsigned int packet_size;
394 if (ftdi == NULL || dev == NULL)
397 // Determine maximum packet size. Init with default value.
398 // New hi-speed devices from FTDI use a packet size of 512 bytes
399 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
400 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
405 if (libusb_get_device_descriptor(dev, &desc) < 0)
408 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
411 if (desc.bNumConfigurations > 0)
413 if (ftdi->interface < config0->bNumInterfaces)
415 struct libusb_interface interface = config0->interface[ftdi->interface];
416 if (interface.num_altsetting > 0)
418 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
419 if (descriptor.bNumEndpoints > 0)
421 packet_size = descriptor.endpoint[0].wMaxPacketSize;
427 libusb_free_config_descriptor (config0);
432 Opens a ftdi device given by an usb_device.
434 \param ftdi pointer to ftdi_context
435 \param dev libusb usb_dev to use
438 \retval -3: unable to config device
439 \retval -4: unable to open device
440 \retval -5: unable to claim device
441 \retval -6: reset failed
442 \retval -7: set baudrate failed
443 \retval -8: ftdi context invalid
444 \retval -9: libusb_get_device_descriptor() failed
445 \retval -10: libusb_get_config_descriptor() failed
446 \retval -11: libusb_etach_kernel_driver() failed
447 \retval -12: libusb_get_configuration() failed
449 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
451 struct libusb_device_descriptor desc;
452 struct libusb_config_descriptor *config0;
453 int cfg, cfg0, detach_errno = 0;
456 ftdi_error_return(-8, "ftdi context invalid");
458 if (libusb_open(dev, &ftdi->usb_dev) < 0)
459 ftdi_error_return(-4, "libusb_open() failed");
461 if (libusb_get_device_descriptor(dev, &desc) < 0)
462 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
464 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
465 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
466 cfg0 = config0->bConfigurationValue;
467 libusb_free_config_descriptor (config0);
469 // Try to detach ftdi_sio kernel module.
471 // The return code is kept in a separate variable and only parsed
472 // if usb_set_configuration() or usb_claim_interface() fails as the
473 // detach operation might be denied and everything still works fine.
474 // Likely scenario is a static ftdi_sio kernel module.
475 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
476 detach_errno = errno;
478 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
479 ftdi_error_return(-12, "libusb_get_configuration () failed");
480 // set configuration (needed especially for windows)
481 // tolerate EBUSY: one device with one configuration, but two interfaces
482 // and libftdi sessions to both interfaces (e.g. FT2232)
483 if (desc.bNumConfigurations > 0 && cfg != cfg0)
485 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
487 ftdi_usb_close_internal (ftdi);
488 if(detach_errno == EPERM)
490 ftdi_error_return(-8, "inappropriate permissions on device!");
494 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
499 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
501 ftdi_usb_close_internal (ftdi);
502 if(detach_errno == EPERM)
504 ftdi_error_return(-8, "inappropriate permissions on device!");
508 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
512 if (ftdi_usb_reset (ftdi) != 0)
514 ftdi_usb_close_internal (ftdi);
515 ftdi_error_return(-6, "ftdi_usb_reset failed");
518 // Try to guess chip type
519 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
520 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
521 && desc.iSerialNumber == 0))
522 ftdi->type = TYPE_BM;
523 else if (desc.bcdDevice == 0x200)
524 ftdi->type = TYPE_AM;
525 else if (desc.bcdDevice == 0x500)
526 ftdi->type = TYPE_2232C;
527 else if (desc.bcdDevice == 0x600)
529 else if (desc.bcdDevice == 0x700)
530 ftdi->type = TYPE_2232H;
531 else if (desc.bcdDevice == 0x800)
532 ftdi->type = TYPE_4232H;
534 // Set default interface on dual/quad type chips
541 ftdi->index = INTERFACE_A;
547 // Determine maximum packet size
548 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
550 if (ftdi_set_baudrate (ftdi, 9600) != 0)
552 ftdi_usb_close_internal (ftdi);
553 ftdi_error_return(-7, "set baudrate failed");
556 ftdi_error_return(0, "all fine");
560 Opens the first device with a given vendor and product ids.
562 \param ftdi pointer to ftdi_context
563 \param vendor Vendor ID
564 \param product Product ID
566 \retval same as ftdi_usb_open_desc()
568 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
570 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
574 Opens the first device with a given, vendor id, product id,
575 description and serial.
577 \param ftdi pointer to ftdi_context
578 \param vendor Vendor ID
579 \param product Product ID
580 \param description Description to search for. Use NULL if not needed.
581 \param serial Serial to search for. Use NULL if not needed.
584 \retval -3: usb device not found
585 \retval -4: unable to open device
586 \retval -5: unable to claim device
587 \retval -6: reset failed
588 \retval -7: set baudrate failed
589 \retval -8: get product description failed
590 \retval -9: get serial number failed
591 \retval -11: libusb_init() failed
592 \retval -12: libusb_get_device_list() failed
593 \retval -13: libusb_get_device_descriptor() failed
595 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
596 const char* description, const char* serial)
598 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
602 Opens the index-th device with a given, vendor id, product id,
603 description and serial.
605 \param ftdi pointer to ftdi_context
606 \param vendor Vendor ID
607 \param product Product ID
608 \param description Description to search for. Use NULL if not needed.
609 \param serial Serial to search for. Use NULL if not needed.
610 \param index Number of matching device to open if there are more than one, starts with 0.
613 \retval -1: usb_find_busses() failed
614 \retval -2: usb_find_devices() failed
615 \retval -3: usb device not found
616 \retval -4: unable to open device
617 \retval -5: unable to claim device
618 \retval -6: reset failed
619 \retval -7: set baudrate failed
620 \retval -8: get product description failed
621 \retval -9: get serial number failed
622 \retval -10: unable to close device
623 \retval -11: ftdi context invalid
625 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
626 const char* description, const char* serial, unsigned int index)
629 libusb_device **devs;
633 if (libusb_init(&ftdi->usb_ctx) < 0)
634 ftdi_error_return(-11, "libusb_init() failed");
637 ftdi_error_return(-11, "ftdi context invalid");
639 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
640 ftdi_error_return(-12, "libusb_get_device_list() failed");
642 while ((dev = devs[i++]) != NULL)
644 struct libusb_device_descriptor desc;
647 if (libusb_get_device_descriptor(dev, &desc) < 0)
648 ftdi_error_return_free_device_list(-13, "libusb_get_device_descriptor() failed", devs);
650 if (desc.idVendor == vendor && desc.idProduct == product)
652 if (libusb_open(dev, &ftdi->usb_dev) < 0)
653 ftdi_error_return_free_device_list(-4, "usb_open() failed", devs);
655 if (description != NULL)
657 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
659 libusb_close (ftdi->usb_dev);
660 ftdi_error_return_free_device_list(-8, "unable to fetch product description", devs);
662 if (strncmp(string, description, sizeof(string)) != 0)
664 libusb_close (ftdi->usb_dev);
670 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
672 ftdi_usb_close_internal (ftdi);
673 ftdi_error_return_free_device_list(-9, "unable to fetch serial number", devs);
675 if (strncmp(string, serial, sizeof(string)) != 0)
677 ftdi_usb_close_internal (ftdi);
682 ftdi_usb_close_internal (ftdi);
690 res = ftdi_usb_open_dev(ftdi, dev);
691 libusb_free_device_list(devs,1);
697 ftdi_error_return_free_device_list(-3, "device not found", devs);
701 Opens the ftdi-device described by a description-string.
702 Intended to be used for parsing a device-description given as commandline argument.
704 \param ftdi pointer to ftdi_context
705 \param description NULL-terminated description-string, using this format:
706 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
707 \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")
708 \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
709 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
711 \note The description format may be extended in later versions.
714 \retval -1: libusb_init() failed
715 \retval -2: libusb_get_device_list() failed
716 \retval -3: usb device not found
717 \retval -4: unable to open device
718 \retval -5: unable to claim device
719 \retval -6: reset failed
720 \retval -7: set baudrate failed
721 \retval -8: get product description failed
722 \retval -9: get serial number failed
723 \retval -10: unable to close device
724 \retval -11: illegal description format
725 \retval -12: ftdi context invalid
727 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
730 ftdi_error_return(-12, "ftdi context invalid");
732 if (description[0] == 0 || description[1] != ':')
733 ftdi_error_return(-11, "illegal description format");
735 if (description[0] == 'd')
738 libusb_device **devs;
739 unsigned int bus_number, device_address;
742 if (libusb_init (&ftdi->usb_ctx) < 0)
743 ftdi_error_return(-1, "libusb_init() failed");
745 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
746 ftdi_error_return(-2, "libusb_get_device_list() failed");
748 /* XXX: This doesn't handle symlinks/odd paths/etc... */
749 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
750 ftdi_error_return_free_device_list(-11, "illegal description format", devs);
752 while ((dev = devs[i++]) != NULL)
755 if (bus_number == libusb_get_bus_number (dev)
756 && device_address == libusb_get_device_address (dev))
758 ret = ftdi_usb_open_dev(ftdi, dev);
759 libusb_free_device_list(devs,1);
765 ftdi_error_return_free_device_list(-3, "device not found", devs);
767 else if (description[0] == 'i' || description[0] == 's')
770 unsigned int product;
771 unsigned int index=0;
772 const char *serial=NULL;
773 const char *startp, *endp;
776 startp=description+2;
777 vendor=strtoul((char*)startp,(char**)&endp,0);
778 if (*endp != ':' || endp == startp || errno != 0)
779 ftdi_error_return(-11, "illegal description format");
782 product=strtoul((char*)startp,(char**)&endp,0);
783 if (endp == startp || errno != 0)
784 ftdi_error_return(-11, "illegal description format");
786 if (description[0] == 'i' && *endp != 0)
788 /* optional index field in i-mode */
790 ftdi_error_return(-11, "illegal description format");
793 index=strtoul((char*)startp,(char**)&endp,0);
794 if (*endp != 0 || endp == startp || errno != 0)
795 ftdi_error_return(-11, "illegal description format");
797 if (description[0] == 's')
800 ftdi_error_return(-11, "illegal description format");
802 /* rest of the description is the serial */
806 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
810 ftdi_error_return(-11, "illegal description format");
815 Resets the ftdi device.
817 \param ftdi pointer to ftdi_context
820 \retval -1: FTDI reset failed
821 \retval -2: USB device unavailable
823 int ftdi_usb_reset(struct ftdi_context *ftdi)
825 if (ftdi == NULL || ftdi->usb_dev == NULL)
826 ftdi_error_return(-2, "USB device unavailable");
828 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
829 SIO_RESET_REQUEST, SIO_RESET_SIO,
830 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
831 ftdi_error_return(-1,"FTDI reset failed");
833 // Invalidate data in the readbuffer
834 ftdi->readbuffer_offset = 0;
835 ftdi->readbuffer_remaining = 0;
841 Clears the read buffer on the chip and the internal read buffer.
843 \param ftdi pointer to ftdi_context
846 \retval -1: read buffer purge failed
847 \retval -2: USB device unavailable
849 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
851 if (ftdi == NULL || ftdi->usb_dev == NULL)
852 ftdi_error_return(-2, "USB device unavailable");
854 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
855 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
856 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
857 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
859 // Invalidate data in the readbuffer
860 ftdi->readbuffer_offset = 0;
861 ftdi->readbuffer_remaining = 0;
867 Clears the write buffer on the chip.
869 \param ftdi pointer to ftdi_context
872 \retval -1: write buffer purge failed
873 \retval -2: USB device unavailable
875 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
877 if (ftdi == NULL || ftdi->usb_dev == NULL)
878 ftdi_error_return(-2, "USB device unavailable");
880 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
881 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
882 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
883 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
889 Clears the buffers on the chip and the internal read buffer.
891 \param ftdi pointer to ftdi_context
894 \retval -1: read buffer purge failed
895 \retval -2: write buffer purge failed
896 \retval -3: USB device unavailable
898 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
902 if (ftdi == NULL || ftdi->usb_dev == NULL)
903 ftdi_error_return(-3, "USB device unavailable");
905 result = ftdi_usb_purge_rx_buffer(ftdi);
909 result = ftdi_usb_purge_tx_buffer(ftdi);
919 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
921 \param ftdi pointer to ftdi_context
924 \retval -1: usb_release failed
925 \retval -3: ftdi context invalid
927 int ftdi_usb_close(struct ftdi_context *ftdi)
932 ftdi_error_return(-3, "ftdi context invalid");
934 if (ftdi->usb_dev != NULL)
935 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
938 ftdi_usb_close_internal (ftdi);
944 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
945 Function is only used internally
948 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
949 unsigned short *value, unsigned short *index)
951 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
952 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
953 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
954 int divisor, best_divisor, best_baud, best_baud_diff;
955 unsigned long encoded_divisor;
964 divisor = 24000000 / baudrate;
966 if (ftdi->type == TYPE_AM)
968 // Round down to supported fraction (AM only)
969 divisor -= am_adjust_dn[divisor & 7];
972 // Try this divisor and the one above it (because division rounds down)
976 for (i = 0; i < 2; i++)
978 int try_divisor = divisor + i;
982 // Round up to supported divisor value
983 if (try_divisor <= 8)
985 // Round up to minimum supported divisor
988 else if (ftdi->type != TYPE_AM && try_divisor < 12)
990 // BM doesn't support divisors 9 through 11 inclusive
993 else if (divisor < 16)
995 // AM doesn't support divisors 9 through 15 inclusive
1000 if (ftdi->type == TYPE_AM)
1002 // Round up to supported fraction (AM only)
1003 try_divisor += am_adjust_up[try_divisor & 7];
1004 if (try_divisor > 0x1FFF8)
1006 // Round down to maximum supported divisor value (for AM)
1007 try_divisor = 0x1FFF8;
1012 if (try_divisor > 0x1FFFF)
1014 // Round down to maximum supported divisor value (for BM)
1015 try_divisor = 0x1FFFF;
1019 // Get estimated baud rate (to nearest integer)
1020 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1021 // Get absolute difference from requested baud rate
1022 if (baud_estimate < baudrate)
1024 baud_diff = baudrate - baud_estimate;
1028 baud_diff = baud_estimate - baudrate;
1030 if (i == 0 || baud_diff < best_baud_diff)
1032 // Closest to requested baud rate so far
1033 best_divisor = try_divisor;
1034 best_baud = baud_estimate;
1035 best_baud_diff = baud_diff;
1038 // Spot on! No point trying
1043 // Encode the best divisor value
1044 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1045 // Deal with special cases for encoded value
1046 if (encoded_divisor == 1)
1048 encoded_divisor = 0; // 3000000 baud
1050 else if (encoded_divisor == 0x4001)
1052 encoded_divisor = 1; // 2000000 baud (BM only)
1054 // Split into "value" and "index" values
1055 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1056 if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
1058 *index = (unsigned short)(encoded_divisor >> 8);
1060 *index |= ftdi->index;
1063 *index = (unsigned short)(encoded_divisor >> 16);
1065 // Return the nearest baud rate
1070 Sets the chip baud rate
1072 \param ftdi pointer to ftdi_context
1073 \param baudrate baud rate to set
1076 \retval -1: invalid baudrate
1077 \retval -2: setting baudrate failed
1078 \retval -3: USB device unavailable
1080 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1082 unsigned short value, index;
1083 int actual_baudrate;
1085 if (ftdi == NULL || ftdi->usb_dev == NULL)
1086 ftdi_error_return(-3, "USB device unavailable");
1088 if (ftdi->bitbang_enabled)
1090 baudrate = baudrate*4;
1093 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1094 if (actual_baudrate <= 0)
1095 ftdi_error_return (-1, "Silly baudrate <= 0.");
1097 // Check within tolerance (about 5%)
1098 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1099 || ((actual_baudrate < baudrate)
1100 ? (actual_baudrate * 21 < baudrate * 20)
1101 : (baudrate * 21 < actual_baudrate * 20)))
1102 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1104 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1105 SIO_SET_BAUDRATE_REQUEST, value,
1106 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1107 ftdi_error_return (-2, "Setting new baudrate failed");
1109 ftdi->baudrate = baudrate;
1114 Set (RS232) line characteristics.
1115 The break type can only be set via ftdi_set_line_property2()
1116 and defaults to "off".
1118 \param ftdi pointer to ftdi_context
1119 \param bits Number of bits
1120 \param sbit Number of stop bits
1121 \param parity Parity mode
1124 \retval -1: Setting line property failed
1126 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1127 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1129 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1133 Set (RS232) line characteristics
1135 \param ftdi pointer to ftdi_context
1136 \param bits Number of bits
1137 \param sbit Number of stop bits
1138 \param parity Parity mode
1139 \param break_type Break type
1142 \retval -1: Setting line property failed
1143 \retval -2: USB device unavailable
1145 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1146 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1147 enum ftdi_break_type break_type)
1149 unsigned short value = bits;
1151 if (ftdi == NULL || ftdi->usb_dev == NULL)
1152 ftdi_error_return(-2, "USB device unavailable");
1157 value |= (0x00 << 8);
1160 value |= (0x01 << 8);
1163 value |= (0x02 << 8);
1166 value |= (0x03 << 8);
1169 value |= (0x04 << 8);
1176 value |= (0x00 << 11);
1179 value |= (0x01 << 11);
1182 value |= (0x02 << 11);
1189 value |= (0x00 << 14);
1192 value |= (0x01 << 14);
1196 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1197 SIO_SET_DATA_REQUEST, value,
1198 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1199 ftdi_error_return (-1, "Setting new line property failed");
1205 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1207 \param ftdi pointer to ftdi_context
1208 \param buf Buffer with the data
1209 \param size Size of the buffer
1211 \retval -666: USB device unavailable
1212 \retval <0: error code from usb_bulk_write()
1213 \retval >0: number of bytes written
1215 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1220 if (ftdi == NULL || ftdi->usb_dev == NULL)
1221 ftdi_error_return(-666, "USB device unavailable");
1223 while (offset < size)
1225 int write_size = ftdi->writebuffer_chunksize;
1227 if (offset+write_size > size)
1228 write_size = size-offset;
1230 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1231 ftdi_error_return(-1, "usb bulk write failed");
1233 offset += actual_length;
1239 static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1241 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1242 struct ftdi_context *ftdi = tc->ftdi;
1243 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1245 packet_size = ftdi->max_packet_size;
1247 actual_length = transfer->actual_length;
1249 if (actual_length > 2)
1251 // skip FTDI status bytes.
1252 // Maybe stored in the future to enable modem use
1253 num_of_chunks = actual_length / packet_size;
1254 chunk_remains = actual_length % packet_size;
1255 //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);
1257 ftdi->readbuffer_offset += 2;
1260 if (actual_length > packet_size - 2)
1262 for (i = 1; i < num_of_chunks; i++)
1263 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1264 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1266 if (chunk_remains > 2)
1268 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1269 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1271 actual_length -= 2*num_of_chunks;
1274 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1277 if (actual_length > 0)
1279 // data still fits in buf?
1280 if (tc->offset + actual_length <= tc->size)
1282 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1283 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1284 tc->offset += actual_length;
1286 ftdi->readbuffer_offset = 0;
1287 ftdi->readbuffer_remaining = 0;
1289 /* Did we read exactly the right amount of bytes? */
1290 if (tc->offset == tc->size)
1292 //printf("read_data exact rem %d offset %d\n",
1293 //ftdi->readbuffer_remaining, offset);
1300 // only copy part of the data or size <= readbuffer_chunksize
1301 int part_size = tc->size - tc->offset;
1302 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1303 tc->offset += part_size;
1305 ftdi->readbuffer_offset += part_size;
1306 ftdi->readbuffer_remaining = actual_length - part_size;
1308 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1309 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1315 ret = libusb_submit_transfer (transfer);
1321 static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1323 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1324 struct ftdi_context *ftdi = tc->ftdi;
1326 tc->offset += transfer->actual_length;
1328 if (tc->offset == tc->size)
1334 int write_size = ftdi->writebuffer_chunksize;
1337 if (tc->offset + write_size > tc->size)
1338 write_size = tc->size - tc->offset;
1340 transfer->length = write_size;
1341 transfer->buffer = tc->buf + tc->offset;
1342 ret = libusb_submit_transfer (transfer);
1350 Writes data to the chip. Does not wait for completion of the transfer
1351 nor does it make sure that the transfer was successful.
1353 Use libusb 1.0 asynchronous API.
1355 \param ftdi pointer to ftdi_context
1356 \param buf Buffer with the data
1357 \param size Size of the buffer
1359 \retval NULL: Some error happens when submit transfer
1360 \retval !NULL: Pointer to a ftdi_transfer_control
1363 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1365 struct ftdi_transfer_control *tc;
1366 struct libusb_transfer *transfer = libusb_alloc_transfer(0);
1367 int write_size, ret;
1369 if (ftdi == NULL || ftdi->usb_dev == NULL)
1371 libusb_free_transfer(transfer);
1375 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1377 if (!tc || !transfer)
1386 if (size < ftdi->writebuffer_chunksize)
1389 write_size = ftdi->writebuffer_chunksize;
1391 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf,
1392 write_size, ftdi_write_data_cb, tc,
1393 ftdi->usb_write_timeout);
1394 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1396 ret = libusb_submit_transfer(transfer);
1399 libusb_free_transfer(transfer);
1401 tc->transfer = NULL;
1404 tc->transfer = transfer;
1410 Reads data from the chip. Does not wait for completion of the transfer
1411 nor does it make sure that the transfer was successful.
1413 Use libusb 1.0 asynchronous API.
1415 \param ftdi pointer to ftdi_context
1416 \param buf Buffer with the data
1417 \param size Size of the buffer
1419 \retval NULL: Some error happens when submit transfer
1420 \retval !NULL: Pointer to a ftdi_transfer_control
1423 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1425 struct ftdi_transfer_control *tc;
1426 struct libusb_transfer *transfer;
1429 if (ftdi == NULL || ftdi->usb_dev == NULL)
1432 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1440 if (size <= ftdi->readbuffer_remaining)
1442 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1445 ftdi->readbuffer_remaining -= size;
1446 ftdi->readbuffer_offset += size;
1448 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1452 tc->transfer = NULL;
1457 if (ftdi->readbuffer_remaining != 0)
1459 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1461 tc->offset = ftdi->readbuffer_remaining;
1466 transfer = libusb_alloc_transfer(0);
1473 ftdi->readbuffer_remaining = 0;
1474 ftdi->readbuffer_offset = 0;
1476 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);
1477 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1479 ret = libusb_submit_transfer(transfer);
1482 libusb_free_transfer(transfer);
1486 tc->transfer = transfer;
1492 Wait for completion of the transfer.
1494 Use libusb 1.0 asynchronous API.
1496 \param tc pointer to ftdi_transfer_control
1498 \retval < 0: Some error happens
1499 \retval >= 0: Data size transferred
1502 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1506 while (!tc->completed)
1508 ret = libusb_handle_events(tc->ftdi->usb_ctx);
1511 if (ret == LIBUSB_ERROR_INTERRUPTED)
1513 libusb_cancel_transfer(tc->transfer);
1514 while (!tc->completed)
1515 if (libusb_handle_events(tc->ftdi->usb_ctx) < 0)
1517 libusb_free_transfer(tc->transfer);
1525 * tc->transfer could be NULL if "(size <= ftdi->readbuffer_remaining)"
1526 * at ftdi_read_data_submit(). Therefore, has to check it here.
1529 if (tc->transfer->status != LIBUSB_TRANSFER_COMPLETED)
1531 libusb_free_transfer(tc->transfer);
1538 Configure write buffer chunk size.
1541 \param ftdi pointer to ftdi_context
1542 \param chunksize Chunk size
1545 \retval -1: ftdi context invalid
1547 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1550 ftdi_error_return(-1, "ftdi context invalid");
1552 ftdi->writebuffer_chunksize = chunksize;
1557 Get write buffer chunk size.
1559 \param ftdi pointer to ftdi_context
1560 \param chunksize Pointer to store chunk size in
1563 \retval -1: ftdi context invalid
1565 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1568 ftdi_error_return(-1, "ftdi context invalid");
1570 *chunksize = ftdi->writebuffer_chunksize;
1575 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1577 Automatically strips the two modem status bytes transfered during every read.
1579 \param ftdi pointer to ftdi_context
1580 \param buf Buffer to store data in
1581 \param size Size of the buffer
1583 \retval -666: USB device unavailable
1584 \retval <0: error code from libusb_bulk_transfer()
1585 \retval 0: no data was available
1586 \retval >0: number of bytes read
1589 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1591 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1592 int packet_size = ftdi->max_packet_size;
1593 int actual_length = 1;
1595 if (ftdi == NULL || ftdi->usb_dev == NULL)
1596 ftdi_error_return(-666, "USB device unavailable");
1598 // Packet size sanity check (avoid division by zero)
1599 if (packet_size == 0)
1600 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1602 // everything we want is still in the readbuffer?
1603 if (size <= ftdi->readbuffer_remaining)
1605 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1608 ftdi->readbuffer_remaining -= size;
1609 ftdi->readbuffer_offset += size;
1611 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1615 // something still in the readbuffer, but not enough to satisfy 'size'?
1616 if (ftdi->readbuffer_remaining != 0)
1618 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1621 offset += ftdi->readbuffer_remaining;
1623 // do the actual USB read
1624 while (offset < size && actual_length > 0)
1626 ftdi->readbuffer_remaining = 0;
1627 ftdi->readbuffer_offset = 0;
1628 /* returns how much received */
1629 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1631 ftdi_error_return(ret, "usb bulk read failed");
1633 if (actual_length > 2)
1635 // skip FTDI status bytes.
1636 // Maybe stored in the future to enable modem use
1637 num_of_chunks = actual_length / packet_size;
1638 chunk_remains = actual_length % packet_size;
1639 //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);
1641 ftdi->readbuffer_offset += 2;
1644 if (actual_length > packet_size - 2)
1646 for (i = 1; i < num_of_chunks; i++)
1647 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1648 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1650 if (chunk_remains > 2)
1652 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1653 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1655 actual_length -= 2*num_of_chunks;
1658 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1661 else if (actual_length <= 2)
1663 // no more data to read?
1666 if (actual_length > 0)
1668 // data still fits in buf?
1669 if (offset+actual_length <= size)
1671 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1672 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1673 offset += actual_length;
1675 /* Did we read exactly the right amount of bytes? */
1677 //printf("read_data exact rem %d offset %d\n",
1678 //ftdi->readbuffer_remaining, offset);
1683 // only copy part of the data or size <= readbuffer_chunksize
1684 int part_size = size-offset;
1685 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1687 ftdi->readbuffer_offset += part_size;
1688 ftdi->readbuffer_remaining = actual_length-part_size;
1689 offset += part_size;
1691 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1692 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1703 Configure read buffer chunk size.
1706 Automatically reallocates the buffer.
1708 \param ftdi pointer to ftdi_context
1709 \param chunksize Chunk size
1712 \retval -1: ftdi context invalid
1714 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1716 unsigned char *new_buf;
1719 ftdi_error_return(-1, "ftdi context invalid");
1721 // Invalidate all remaining data
1722 ftdi->readbuffer_offset = 0;
1723 ftdi->readbuffer_remaining = 0;
1725 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1726 which is defined in libusb-1.0. Otherwise, each USB read request will
1727 be divided into multiple URBs. This will cause issues on Linux kernel
1728 older than 2.6.32. */
1729 if (chunksize > 16384)
1733 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1734 ftdi_error_return(-1, "out of memory for readbuffer");
1736 ftdi->readbuffer = new_buf;
1737 ftdi->readbuffer_chunksize = chunksize;
1743 Get read buffer chunk size.
1745 \param ftdi pointer to ftdi_context
1746 \param chunksize Pointer to store chunk size in
1749 \retval -1: FTDI context invalid
1751 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1754 ftdi_error_return(-1, "FTDI context invalid");
1756 *chunksize = ftdi->readbuffer_chunksize;
1762 Enable bitbang mode.
1764 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1766 \param ftdi pointer to ftdi_context
1767 \param bitmask Bitmask to configure lines.
1768 HIGH/ON value configures a line as output.
1771 \retval -1: can't enable bitbang mode
1772 \retval -2: USB device unavailable
1774 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1776 unsigned short usb_val;
1778 if (ftdi == NULL || ftdi->usb_dev == NULL)
1779 ftdi_error_return(-2, "USB device unavailable");
1781 usb_val = bitmask; // low byte: bitmask
1782 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1783 usb_val |= (ftdi->bitbang_mode << 8);
1785 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1786 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1787 NULL, 0, ftdi->usb_write_timeout) < 0)
1788 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1790 ftdi->bitbang_enabled = 1;
1795 Disable bitbang mode.
1797 \param ftdi pointer to ftdi_context
1800 \retval -1: can't disable bitbang mode
1801 \retval -2: USB device unavailable
1803 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1805 if (ftdi == NULL || ftdi->usb_dev == NULL)
1806 ftdi_error_return(-2, "USB device unavailable");
1808 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)
1809 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1811 ftdi->bitbang_enabled = 0;
1816 Enable/disable bitbang modes.
1818 \param ftdi pointer to ftdi_context
1819 \param bitmask Bitmask to configure lines.
1820 HIGH/ON value configures a line as output.
1821 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1824 \retval -1: can't enable bitbang mode
1825 \retval -2: USB device unavailable
1827 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1829 unsigned short usb_val;
1831 if (ftdi == NULL || ftdi->usb_dev == NULL)
1832 ftdi_error_return(-2, "USB device unavailable");
1834 usb_val = bitmask; // low byte: bitmask
1835 usb_val |= (mode << 8);
1836 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)
1837 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?");
1839 ftdi->bitbang_mode = mode;
1840 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1845 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1847 \param ftdi pointer to ftdi_context
1848 \param pins Pointer to store pins into
1851 \retval -1: read pins failed
1852 \retval -2: USB device unavailable
1854 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1856 if (ftdi == NULL || ftdi->usb_dev == NULL)
1857 ftdi_error_return(-2, "USB device unavailable");
1859 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)
1860 ftdi_error_return(-1, "read pins failed");
1868 The FTDI chip keeps data in the internal buffer for a specific
1869 amount of time if the buffer is not full yet to decrease
1870 load on the usb bus.
1872 \param ftdi pointer to ftdi_context
1873 \param latency Value between 1 and 255
1876 \retval -1: latency out of range
1877 \retval -2: unable to set latency timer
1878 \retval -3: USB device unavailable
1880 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1882 unsigned short usb_val;
1885 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1887 if (ftdi == NULL || ftdi->usb_dev == NULL)
1888 ftdi_error_return(-3, "USB device unavailable");
1891 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)
1892 ftdi_error_return(-2, "unable to set latency timer");
1900 \param ftdi pointer to ftdi_context
1901 \param latency Pointer to store latency value in
1904 \retval -1: unable to get latency timer
1905 \retval -2: USB device unavailable
1907 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
1909 unsigned short usb_val;
1911 if (ftdi == NULL || ftdi->usb_dev == NULL)
1912 ftdi_error_return(-2, "USB device unavailable");
1914 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)
1915 ftdi_error_return(-1, "reading latency timer failed");
1917 *latency = (unsigned char)usb_val;
1922 Poll modem status information
1924 This function allows the retrieve the two status bytes of the device.
1925 The device sends these bytes also as a header for each read access
1926 where they are discarded by ftdi_read_data(). The chip generates
1927 the two stripped status bytes in the absence of data every 40 ms.
1929 Layout of the first byte:
1930 - B0..B3 - must be 0
1931 - B4 Clear to send (CTS)
1934 - B5 Data set ready (DTS)
1937 - B6 Ring indicator (RI)
1940 - B7 Receive line signal detect (RLSD)
1944 Layout of the second byte:
1945 - B0 Data ready (DR)
1946 - B1 Overrun error (OE)
1947 - B2 Parity error (PE)
1948 - B3 Framing error (FE)
1949 - B4 Break interrupt (BI)
1950 - B5 Transmitter holding register (THRE)
1951 - B6 Transmitter empty (TEMT)
1952 - B7 Error in RCVR FIFO
1954 \param ftdi pointer to ftdi_context
1955 \param status Pointer to store status information in. Must be two bytes.
1958 \retval -1: unable to retrieve status information
1959 \retval -2: USB device unavailable
1961 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
1965 if (ftdi == NULL || ftdi->usb_dev == NULL)
1966 ftdi_error_return(-2, "USB device unavailable");
1968 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)
1969 ftdi_error_return(-1, "getting modem status failed");
1971 *status = (usb_val[1] << 8) | usb_val[0];
1977 Set flowcontrol for ftdi chip
1979 \param ftdi pointer to ftdi_context
1980 \param flowctrl flow control to use. should be
1981 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
1984 \retval -1: set flow control failed
1985 \retval -2: USB device unavailable
1987 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
1989 if (ftdi == NULL || ftdi->usb_dev == NULL)
1990 ftdi_error_return(-2, "USB device unavailable");
1992 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1993 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
1994 NULL, 0, ftdi->usb_write_timeout) < 0)
1995 ftdi_error_return(-1, "set flow control failed");
2003 \param ftdi pointer to ftdi_context
2004 \param state state to set line to (1 or 0)
2007 \retval -1: set dtr failed
2008 \retval -2: USB device unavailable
2010 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2012 unsigned short usb_val;
2014 if (ftdi == NULL || ftdi->usb_dev == NULL)
2015 ftdi_error_return(-2, "USB device unavailable");
2018 usb_val = SIO_SET_DTR_HIGH;
2020 usb_val = SIO_SET_DTR_LOW;
2022 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2023 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2024 NULL, 0, ftdi->usb_write_timeout) < 0)
2025 ftdi_error_return(-1, "set dtr failed");
2033 \param ftdi pointer to ftdi_context
2034 \param state state to set line to (1 or 0)
2037 \retval -1: set rts failed
2038 \retval -2: USB device unavailable
2040 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2042 unsigned short usb_val;
2044 if (ftdi == NULL || ftdi->usb_dev == NULL)
2045 ftdi_error_return(-2, "USB device unavailable");
2048 usb_val = SIO_SET_RTS_HIGH;
2050 usb_val = SIO_SET_RTS_LOW;
2052 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2053 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2054 NULL, 0, ftdi->usb_write_timeout) < 0)
2055 ftdi_error_return(-1, "set of rts failed");
2061 Set dtr and rts line in one pass
2063 \param ftdi pointer to ftdi_context
2064 \param dtr DTR state to set line to (1 or 0)
2065 \param rts RTS state to set line to (1 or 0)
2068 \retval -1: set dtr/rts failed
2069 \retval -2: USB device unavailable
2071 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2073 unsigned short usb_val;
2075 if (ftdi == NULL || ftdi->usb_dev == NULL)
2076 ftdi_error_return(-2, "USB device unavailable");
2079 usb_val = SIO_SET_DTR_HIGH;
2081 usb_val = SIO_SET_DTR_LOW;
2084 usb_val |= SIO_SET_RTS_HIGH;
2086 usb_val |= SIO_SET_RTS_LOW;
2088 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2089 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2090 NULL, 0, ftdi->usb_write_timeout) < 0)
2091 ftdi_error_return(-1, "set of rts/dtr failed");
2097 Set the special event character
2099 \param ftdi pointer to ftdi_context
2100 \param eventch Event character
2101 \param enable 0 to disable the event character, non-zero otherwise
2104 \retval -1: unable to set event character
2105 \retval -2: USB device unavailable
2107 int ftdi_set_event_char(struct ftdi_context *ftdi,
2108 unsigned char eventch, unsigned char enable)
2110 unsigned short usb_val;
2112 if (ftdi == NULL || ftdi->usb_dev == NULL)
2113 ftdi_error_return(-2, "USB device unavailable");
2119 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)
2120 ftdi_error_return(-1, "setting event character failed");
2128 \param ftdi pointer to ftdi_context
2129 \param errorch Error character
2130 \param enable 0 to disable the error character, non-zero otherwise
2133 \retval -1: unable to set error character
2134 \retval -2: USB device unavailable
2136 int ftdi_set_error_char(struct ftdi_context *ftdi,
2137 unsigned char errorch, unsigned char enable)
2139 unsigned short usb_val;
2141 if (ftdi == NULL || ftdi->usb_dev == NULL)
2142 ftdi_error_return(-2, "USB device unavailable");
2148 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)
2149 ftdi_error_return(-1, "setting error character failed");
2157 \param ftdi pointer to ftdi_context
2158 \param eeprom Pointer to ftdi_eeprom
2162 void ftdi_eeprom_setsize(struct ftdi_context *ftdi, struct ftdi_eeprom *eeprom, int size)
2167 ftdi->eeprom_size=size;
2172 Init eeprom with default values.
2174 \param eeprom Pointer to ftdi_eeprom
2176 void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom)
2181 eeprom->vendor_id = 0x0403;
2182 eeprom->product_id = 0x6001;
2184 eeprom->self_powered = 1;
2185 eeprom->remote_wakeup = 1;
2186 eeprom->BM_type_chip = 1;
2188 eeprom->in_is_isochronous = 0;
2189 eeprom->out_is_isochronous = 0;
2190 eeprom->suspend_pull_downs = 0;
2192 eeprom->use_serial = 0;
2193 eeprom->change_usb_version = 0;
2194 eeprom->usb_version = 0x0200;
2195 eeprom->max_power = 0;
2197 eeprom->manufacturer = NULL;
2198 eeprom->product = NULL;
2199 eeprom->serial = NULL;
2201 eeprom->size = FTDI_DEFAULT_EEPROM_SIZE;
2205 Frees allocated memory in eeprom.
2207 \param eeprom Pointer to ftdi_eeprom
2209 void ftdi_eeprom_free(struct ftdi_eeprom *eeprom)
2211 if (eeprom->manufacturer != 0) {
2212 free(eeprom->manufacturer);
2213 eeprom->manufacturer = 0;
2215 if (eeprom->product != 0) {
2216 free(eeprom->product);
2217 eeprom->product = 0;
2219 if (eeprom->serial != 0) {
2220 free(eeprom->serial);
2226 Build binary output from ftdi_eeprom structure.
2227 Output is suitable for ftdi_write_eeprom().
2229 \param eeprom Pointer to ftdi_eeprom
2230 \param output Buffer of 128 bytes to store eeprom image to
2232 \retval >0: used eeprom size
2233 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2234 \retval -2: Invalid eeprom pointer
2236 int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output)
2239 unsigned short checksum, value;
2240 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2246 if (eeprom->manufacturer != NULL)
2247 manufacturer_size = strlen(eeprom->manufacturer);
2248 if (eeprom->product != NULL)
2249 product_size = strlen(eeprom->product);
2250 if (eeprom->serial != NULL)
2251 serial_size = strlen(eeprom->serial);
2253 size_check = eeprom->size;
2254 size_check -= 28; // 28 are always in use (fixed)
2256 // Top half of a 256byte eeprom is used just for strings and checksum
2257 // it seems that the FTDI chip will not read these strings from the lower half
2258 // Each string starts with two bytes; offset and type (0x03 for string)
2259 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2260 if (eeprom->size>=256)size_check = 120;
2261 size_check -= manufacturer_size*2;
2262 size_check -= product_size*2;
2263 size_check -= serial_size*2;
2265 // eeprom size exceeded?
2270 memset (output, 0, eeprom->size);
2272 // Addr 00: Stay 00 00
2273 // Addr 02: Vendor ID
2274 output[0x02] = eeprom->vendor_id;
2275 output[0x03] = eeprom->vendor_id >> 8;
2277 // Addr 04: Product ID
2278 output[0x04] = eeprom->product_id;
2279 output[0x05] = eeprom->product_id >> 8;
2281 // Addr 06: Device release number (0400h for BM features)
2282 output[0x06] = 0x00;
2284 if (eeprom->BM_type_chip == 1)
2285 output[0x07] = 0x04;
2287 output[0x07] = 0x02;
2289 // Addr 08: Config descriptor
2291 // Bit 6: 1 if this device is self powered, 0 if bus powered
2292 // Bit 5: 1 if this device uses remote wakeup
2293 // Bit 4: 1 if this device is battery powered
2295 if (eeprom->self_powered == 1)
2297 if (eeprom->remote_wakeup == 1)
2301 // Addr 09: Max power consumption: max power = value * 2 mA
2302 output[0x09] = eeprom->max_power;
2304 // Addr 0A: Chip configuration
2305 // Bit 7: 0 - reserved
2306 // Bit 6: 0 - reserved
2307 // Bit 5: 0 - reserved
2308 // Bit 4: 1 - Change USB version
2309 // Bit 3: 1 - Use the serial number string
2310 // Bit 2: 1 - Enable suspend pull downs for lower power
2311 // Bit 1: 1 - Out EndPoint is Isochronous
2312 // Bit 0: 1 - In EndPoint is Isochronous
2315 if (eeprom->in_is_isochronous == 1)
2317 if (eeprom->out_is_isochronous == 1)
2319 if (eeprom->suspend_pull_downs == 1)
2321 if (eeprom->use_serial == 1)
2323 if (eeprom->change_usb_version == 1)
2327 // Addr 0B: reserved
2328 output[0x0B] = 0x00;
2330 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2331 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2332 if (eeprom->change_usb_version == 1)
2334 output[0x0C] = eeprom->usb_version;
2335 output[0x0D] = eeprom->usb_version >> 8;
2339 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2340 // Addr 0F: Length of manufacturer string
2341 output[0x0F] = manufacturer_size*2 + 2;
2343 // Addr 10: Offset of the product string + 0x80, calculated later
2344 // Addr 11: Length of product string
2345 output[0x11] = product_size*2 + 2;
2347 // Addr 12: Offset of the serial string + 0x80, calculated later
2348 // Addr 13: Length of serial string
2349 output[0x13] = serial_size*2 + 2;
2353 if (eeprom->size>=256) i = 0x80;
2356 // Output manufacturer
2357 output[0x0E] = i | 0x80; // calculate offset
2358 output[i++] = manufacturer_size*2 + 2;
2359 output[i++] = 0x03; // type: string
2360 for (j = 0; j < manufacturer_size; j++)
2362 output[i] = eeprom->manufacturer[j], i++;
2363 output[i] = 0x00, i++;
2366 // Output product name
2367 output[0x10] = i | 0x80; // calculate offset
2368 output[i] = product_size*2 + 2, i++;
2369 output[i] = 0x03, i++;
2370 for (j = 0; j < product_size; j++)
2372 output[i] = eeprom->product[j], i++;
2373 output[i] = 0x00, i++;
2377 output[0x12] = i | 0x80; // calculate offset
2378 output[i] = serial_size*2 + 2, i++;
2379 output[i] = 0x03, i++;
2380 for (j = 0; j < serial_size; j++)
2382 output[i] = eeprom->serial[j], i++;
2383 output[i] = 0x00, i++;
2386 // calculate checksum
2389 for (i = 0; i < eeprom->size/2-1; i++)
2391 value = output[i*2];
2392 value += output[(i*2)+1] << 8;
2394 checksum = value^checksum;
2395 checksum = (checksum << 1) | (checksum >> 15);
2398 output[eeprom->size-2] = checksum;
2399 output[eeprom->size-1] = checksum >> 8;
2405 Decode binary EEPROM image into an ftdi_eeprom structure.
2407 \param eeprom Pointer to ftdi_eeprom which will be filled in.
2408 \param buf Buffer of \a size bytes of raw eeprom data
2409 \param size size size of eeprom data in bytes
2412 \retval -1: something went wrong
2414 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2415 FIXME: Strings are malloc'ed here and should be freed somewhere
2417 int ftdi_eeprom_decode(struct ftdi_eeprom *eeprom, unsigned char *buf, int size)
2420 unsigned short checksum, eeprom_checksum, value;
2421 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2422 int eeprom_size = 128;
2427 size_check = eeprom->size;
2428 size_check -= 28; // 28 are always in use (fixed)
2430 // Top half of a 256byte eeprom is used just for strings and checksum
2431 // it seems that the FTDI chip will not read these strings from the lower half
2432 // Each string starts with two bytes; offset and type (0x03 for string)
2433 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2434 if (eeprom->size>=256)size_check = 120;
2435 size_check -= manufacturer_size*2;
2436 size_check -= product_size*2;
2437 size_check -= serial_size*2;
2439 // eeprom size exceeded?
2444 // empty eeprom struct
2445 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2447 // Addr 00: Stay 00 00
2449 // Addr 02: Vendor ID
2450 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2452 // Addr 04: Product ID
2453 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2455 value = buf[0x06] + (buf[0x07]<<8);
2459 eeprom->BM_type_chip = 1;
2462 eeprom->BM_type_chip = 0;
2464 default: // Unknown device
2465 eeprom->BM_type_chip = 0;
2469 // Addr 08: Config descriptor
2471 // Bit 6: 1 if this device is self powered, 0 if bus powered
2472 // Bit 5: 1 if this device uses remote wakeup
2473 // Bit 4: 1 if this device is battery powered
2475 if (j&0x40) eeprom->self_powered = 1;
2476 if (j&0x20) eeprom->remote_wakeup = 1;
2478 // Addr 09: Max power consumption: max power = value * 2 mA
2479 eeprom->max_power = buf[0x09];
2481 // Addr 0A: Chip configuration
2482 // Bit 7: 0 - reserved
2483 // Bit 6: 0 - reserved
2484 // Bit 5: 0 - reserved
2485 // Bit 4: 1 - Change USB version
2486 // Bit 3: 1 - Use the serial number string
2487 // Bit 2: 1 - Enable suspend pull downs for lower power
2488 // Bit 1: 1 - Out EndPoint is Isochronous
2489 // Bit 0: 1 - In EndPoint is Isochronous
2492 if (j&0x01) eeprom->in_is_isochronous = 1;
2493 if (j&0x02) eeprom->out_is_isochronous = 1;
2494 if (j&0x04) eeprom->suspend_pull_downs = 1;
2495 if (j&0x08) eeprom->use_serial = 1;
2496 if (j&0x10) eeprom->change_usb_version = 1;
2498 // Addr 0B: reserved
2500 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2501 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2502 if (eeprom->change_usb_version == 1)
2504 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2507 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2508 // Addr 0F: Length of manufacturer string
2509 manufacturer_size = buf[0x0F]/2;
2510 if (manufacturer_size > 0) eeprom->manufacturer = malloc(manufacturer_size);
2511 else eeprom->manufacturer = NULL;
2513 // Addr 10: Offset of the product string + 0x80, calculated later
2514 // Addr 11: Length of product string
2515 product_size = buf[0x11]/2;
2516 if (product_size > 0) eeprom->product = malloc(product_size);
2517 else eeprom->product = NULL;
2519 // Addr 12: Offset of the serial string + 0x80, calculated later
2520 // Addr 13: Length of serial string
2521 serial_size = buf[0x13]/2;
2522 if (serial_size > 0) eeprom->serial = malloc(serial_size);
2523 else eeprom->serial = NULL;
2525 // Decode manufacturer
2526 i = buf[0x0E] & 0x7f; // offset
2527 for (j=0;j<manufacturer_size-1;j++)
2529 eeprom->manufacturer[j] = buf[2*j+i+2];
2531 eeprom->manufacturer[j] = '\0';
2533 // Decode product name
2534 i = buf[0x10] & 0x7f; // offset
2535 for (j=0;j<product_size-1;j++)
2537 eeprom->product[j] = buf[2*j+i+2];
2539 eeprom->product[j] = '\0';
2542 i = buf[0x12] & 0x7f; // offset
2543 for (j=0;j<serial_size-1;j++)
2545 eeprom->serial[j] = buf[2*j+i+2];
2547 eeprom->serial[j] = '\0';
2552 for (i = 0; i < eeprom_size/2-1; i++)
2555 value += buf[(i*2)+1] << 8;
2557 checksum = value^checksum;
2558 checksum = (checksum << 1) | (checksum >> 15);
2561 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
2563 if (eeprom_checksum != checksum)
2565 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
2573 Read eeprom location
2575 \param ftdi pointer to ftdi_context
2576 \param eeprom_addr Address of eeprom location to be read
2577 \param eeprom_val Pointer to store read eeprom location
2580 \retval -1: read failed
2581 \retval -2: USB device unavailable
2583 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
2585 if (ftdi == NULL || ftdi->usb_dev == NULL)
2586 ftdi_error_return(-2, "USB device unavailable");
2588 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)
2589 ftdi_error_return(-1, "reading eeprom failed");
2597 \param ftdi pointer to ftdi_context
2598 \param eeprom Pointer to store eeprom into
2601 \retval -1: read failed
2602 \retval -2: USB device unavailable
2604 int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2608 if (ftdi == NULL || ftdi->usb_dev == NULL)
2609 ftdi_error_return(-2, "USB device unavailable");
2611 for (i = 0; i < ftdi->eeprom_size/2; i++)
2613 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)
2614 ftdi_error_return(-1, "reading eeprom failed");
2621 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
2622 Function is only used internally
2625 static unsigned char ftdi_read_chipid_shift(unsigned char value)
2627 return ((value & 1) << 1) |
2628 ((value & 2) << 5) |
2629 ((value & 4) >> 2) |
2630 ((value & 8) << 4) |
2631 ((value & 16) >> 1) |
2632 ((value & 32) >> 1) |
2633 ((value & 64) >> 4) |
2634 ((value & 128) >> 2);
2638 Read the FTDIChip-ID from R-type devices
2640 \param ftdi pointer to ftdi_context
2641 \param chipid Pointer to store FTDIChip-ID
2644 \retval -1: read failed
2645 \retval -2: USB device unavailable
2647 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
2649 unsigned int a = 0, b = 0;
2651 if (ftdi == NULL || ftdi->usb_dev == NULL)
2652 ftdi_error_return(-2, "USB device unavailable");
2654 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)
2656 a = a << 8 | a >> 8;
2657 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)
2659 b = b << 8 | b >> 8;
2660 a = (a << 16) | (b & 0xFFFF);
2661 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
2662 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
2663 *chipid = a ^ 0xa5f0f7d1;
2668 ftdi_error_return(-1, "read of FTDIChip-ID failed");
2672 Guesses size of eeprom by reading eeprom and comparing halves - will not work with blank eeprom
2673 Call this function then do a write then call again to see if size changes, if so write again.
2675 \param ftdi pointer to ftdi_context
2676 \param eeprom Pointer to store eeprom into
2677 \param maxsize the size of the buffer to read into
2679 \retval -1: eeprom read failed
2680 \retval -2: USB device unavailable
2681 \retval >=0: size of eeprom
2683 int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize)
2685 int i=0,j,minsize=32;
2688 if (ftdi == NULL || ftdi->usb_dev == NULL)
2689 ftdi_error_return(-2, "USB device unavailable");
2693 for (j = 0; i < maxsize/2 && j<size; j++)
2695 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,
2696 SIO_READ_EEPROM_REQUEST, 0, i,
2697 eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2698 ftdi_error_return(-1, "eeprom read failed");
2703 while (size<=maxsize && memcmp(eeprom,&eeprom[size/2],size/2)!=0);
2709 Write eeprom location
2711 \param ftdi pointer to ftdi_context
2712 \param eeprom_addr Address of eeprom location to be written
2713 \param eeprom_val Value to be written
2716 \retval -1: read failed
2717 \retval -2: USB device unavailable
2719 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr, unsigned short eeprom_val)
2721 if (ftdi == NULL || ftdi->usb_dev == NULL)
2722 ftdi_error_return(-2, "USB device unavailable");
2724 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2725 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
2726 NULL, 0, ftdi->usb_write_timeout) != 0)
2727 ftdi_error_return(-1, "unable to write eeprom");
2735 \param ftdi pointer to ftdi_context
2736 \param eeprom Pointer to read eeprom from
2739 \retval -1: read failed
2740 \retval -2: USB device unavailable
2742 int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2744 unsigned short usb_val, status;
2747 if (ftdi == NULL || ftdi->usb_dev == NULL)
2748 ftdi_error_return(-2, "USB device unavailable");
2750 /* These commands were traced while running MProg */
2751 if ((ret = ftdi_usb_reset(ftdi)) != 0)
2753 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
2755 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
2758 for (i = 0; i < ftdi->eeprom_size/2; i++)
2760 usb_val = eeprom[i*2];
2761 usb_val += eeprom[(i*2)+1] << 8;
2762 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2763 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
2764 NULL, 0, ftdi->usb_write_timeout) < 0)
2765 ftdi_error_return(-1, "unable to write eeprom");
2774 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
2776 \param ftdi pointer to ftdi_context
2779 \retval -1: erase failed
2780 \retval -2: USB device unavailable
2782 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
2784 if (ftdi == NULL || ftdi->usb_dev == NULL)
2785 ftdi_error_return(-2, "USB device unavailable");
2787 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST, 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
2788 ftdi_error_return(-1, "unable to erase eeprom");
2794 Get string representation for last error code
2796 \param ftdi pointer to ftdi_context
2798 \retval Pointer to error string
2800 char *ftdi_get_error_string (struct ftdi_context *ftdi)
2805 return ftdi->error_str;
2808 /* @} end of doxygen libftdi group */