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; \
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)
56 if (ftdi && ftdi->usb_dev)
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
134 \retval -2: USB device unavailable
136 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
139 ftdi_error_return(-2, "USB device unavailable");
145 /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */
149 ftdi->index = INTERFACE_B;
155 ftdi->index = INTERFACE_C;
161 ftdi->index = INTERFACE_D;
166 ftdi_error_return(-1, "Unknown interface");
172 Deinitializes a ftdi_context.
174 \param ftdi pointer to ftdi_context
176 void ftdi_deinit(struct ftdi_context *ftdi)
181 ftdi_usb_close_internal (ftdi);
183 if (ftdi->readbuffer != NULL)
185 free(ftdi->readbuffer);
186 ftdi->readbuffer = NULL;
191 Deinitialize and free an ftdi_context.
193 \param ftdi pointer to ftdi_context
195 void ftdi_free(struct ftdi_context *ftdi)
202 Use an already open libusb device.
204 \param ftdi pointer to ftdi_context
205 \param usb libusb libusb_device_handle to use
207 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
217 Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which
218 needs to be deallocated by ftdi_list_free() after use.
220 \param ftdi pointer to ftdi_context
221 \param devlist Pointer where to store list of found devices
222 \param vendor Vendor ID to search for
223 \param product Product ID to search for
225 \retval >0: number of devices found
226 \retval -3: out of memory
227 \retval -4: libusb_init() failed
228 \retval -5: libusb_get_device_list() failed
229 \retval -6: libusb_get_device_descriptor() failed
231 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
233 struct ftdi_device_list **curdev;
235 libusb_device **devs;
239 if (libusb_init(NULL) < 0)
240 ftdi_error_return(-4, "libusb_init() failed");
242 if (libusb_get_device_list(NULL, &devs) < 0)
243 ftdi_error_return(-5, "libusb_get_device_list() failed");
248 while ((dev = devs[i++]) != NULL)
250 struct libusb_device_descriptor desc;
252 if (libusb_get_device_descriptor(dev, &desc) < 0)
253 ftdi_error_return(-6, "libusb_get_device_descriptor() failed");
255 if (desc.idVendor == vendor && desc.idProduct == product)
257 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
259 ftdi_error_return(-3, "out of memory");
261 (*curdev)->next = NULL;
262 (*curdev)->dev = dev;
264 curdev = &(*curdev)->next;
273 Frees a usb device list.
275 \param devlist USB device list created by ftdi_usb_find_all()
277 void ftdi_list_free(struct ftdi_device_list **devlist)
279 struct ftdi_device_list *curdev, *next;
281 for (curdev = *devlist; curdev != NULL;)
292 Frees a usb device list.
294 \param devlist USB device list created by ftdi_usb_find_all()
296 void ftdi_list_free2(struct ftdi_device_list *devlist)
298 ftdi_list_free(&devlist);
302 Return device ID strings from the usb device.
304 The parameters manufacturer, description and serial may be NULL
305 or pointer to buffers to store the fetched strings.
307 \note Use this function only in combination with ftdi_usb_find_all()
308 as it closes the internal "usb_dev" after use.
310 \param ftdi pointer to ftdi_context
311 \param dev libusb usb_dev to use
312 \param manufacturer Store manufacturer string here if not NULL
313 \param mnf_len Buffer size of manufacturer string
314 \param description Store product description string here if not NULL
315 \param desc_len Buffer size of product description string
316 \param serial Store serial string here if not NULL
317 \param serial_len Buffer size of serial string
320 \retval -1: wrong arguments
321 \retval -4: unable to open device
322 \retval -7: get product manufacturer failed
323 \retval -8: get product description failed
324 \retval -9: get serial number failed
325 \retval -11: libusb_get_device_descriptor() failed
327 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
328 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
330 struct libusb_device_descriptor desc;
332 if ((ftdi==NULL) || (dev==NULL))
335 if (libusb_open(dev, &ftdi->usb_dev) < 0)
336 ftdi_error_return(-4, "libusb_open() failed");
338 if (libusb_get_device_descriptor(dev, &desc) < 0)
339 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
341 if (manufacturer != NULL)
343 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
345 ftdi_usb_close_internal (ftdi);
346 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
350 if (description != NULL)
352 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
354 ftdi_usb_close_internal (ftdi);
355 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
361 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
363 ftdi_usb_close_internal (ftdi);
364 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
368 ftdi_usb_close_internal (ftdi);
374 * Internal function to determine the maximum packet size.
375 * \param ftdi pointer to ftdi_context
376 * \param dev libusb usb_dev to use
377 * \retval Maximum packet size for this device
379 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
381 struct libusb_device_descriptor desc;
382 struct libusb_config_descriptor *config0;
383 unsigned int packet_size;
386 if (ftdi == NULL || dev == NULL)
389 // Determine maximum packet size. Init with default value.
390 // New hi-speed devices from FTDI use a packet size of 512 bytes
391 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
392 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
397 if (libusb_get_device_descriptor(dev, &desc) < 0)
400 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
403 if (desc.bNumConfigurations > 0)
405 if (ftdi->interface < config0->bNumInterfaces)
407 struct libusb_interface interface = config0->interface[ftdi->interface];
408 if (interface.num_altsetting > 0)
410 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
411 if (descriptor.bNumEndpoints > 0)
413 packet_size = descriptor.endpoint[0].wMaxPacketSize;
419 libusb_free_config_descriptor (config0);
424 Opens a ftdi device given by an usb_device.
426 \param ftdi pointer to ftdi_context
427 \param dev libusb usb_dev to use
430 \retval -3: unable to config device
431 \retval -4: unable to open device
432 \retval -5: unable to claim device
433 \retval -6: reset failed
434 \retval -7: set baudrate failed
435 \retval -8: ftdi context invalid
436 \retval -9: libusb_get_device_descriptor() failed
437 \retval -10: libusb_get_config_descriptor() failed
438 \retval -11: libusb_etach_kernel_driver() failed
439 \retval -12: libusb_get_configuration() failed
441 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
443 struct libusb_device_descriptor desc;
444 struct libusb_config_descriptor *config0;
445 int cfg, cfg0, detach_errno = 0;
448 ftdi_error_return(-8, "ftdi context invalid");
450 if (libusb_open(dev, &ftdi->usb_dev) < 0)
451 ftdi_error_return(-4, "libusb_open() failed");
453 if (libusb_get_device_descriptor(dev, &desc) < 0)
454 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
456 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
457 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
458 cfg0 = config0->bConfigurationValue;
459 libusb_free_config_descriptor (config0);
461 // Try to detach ftdi_sio kernel module.
463 // The return code is kept in a separate variable and only parsed
464 // if usb_set_configuration() or usb_claim_interface() fails as the
465 // detach operation might be denied and everything still works fine.
466 // Likely scenario is a static ftdi_sio kernel module.
467 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
468 detach_errno = errno;
470 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
471 ftdi_error_return(-12, "libusb_get_configuration () failed");
472 // set configuration (needed especially for windows)
473 // tolerate EBUSY: one device with one configuration, but two interfaces
474 // and libftdi sessions to both interfaces (e.g. FT2232)
475 if (desc.bNumConfigurations > 0 && cfg != cfg0)
477 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
479 ftdi_usb_close_internal (ftdi);
480 if(detach_errno == EPERM)
482 ftdi_error_return(-8, "inappropriate permissions on device!");
486 ftdi_error_return(-3, "unable to set usb configuration. Make sure ftdi_sio is unloaded!");
491 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
493 ftdi_usb_close_internal (ftdi);
494 if(detach_errno == EPERM)
496 ftdi_error_return(-8, "inappropriate permissions on device!");
500 ftdi_error_return(-5, "unable to claim usb device. Make sure ftdi_sio is unloaded!");
504 if (ftdi_usb_reset (ftdi) != 0)
506 ftdi_usb_close_internal (ftdi);
507 ftdi_error_return(-6, "ftdi_usb_reset failed");
510 // Try to guess chip type
511 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
512 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
513 && desc.iSerialNumber == 0))
514 ftdi->type = TYPE_BM;
515 else if (desc.bcdDevice == 0x200)
516 ftdi->type = TYPE_AM;
517 else if (desc.bcdDevice == 0x500)
518 ftdi->type = TYPE_2232C;
519 else if (desc.bcdDevice == 0x600)
521 else if (desc.bcdDevice == 0x700)
522 ftdi->type = TYPE_2232H;
523 else if (desc.bcdDevice == 0x800)
524 ftdi->type = TYPE_4232H;
526 // Set default interface on dual/quad type chips
533 ftdi->index = INTERFACE_A;
539 // Determine maximum packet size
540 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
542 if (ftdi_set_baudrate (ftdi, 9600) != 0)
544 ftdi_usb_close_internal (ftdi);
545 ftdi_error_return(-7, "set baudrate failed");
548 ftdi_error_return(0, "all fine");
552 Opens the first device with a given vendor and product ids.
554 \param ftdi pointer to ftdi_context
555 \param vendor Vendor ID
556 \param product Product ID
558 \retval same as ftdi_usb_open_desc()
560 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
562 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
566 Opens the first device with a given, vendor id, product id,
567 description and serial.
569 \param ftdi pointer to ftdi_context
570 \param vendor Vendor ID
571 \param product Product ID
572 \param description Description to search for. Use NULL if not needed.
573 \param serial Serial to search for. Use NULL if not needed.
576 \retval -3: usb device not found
577 \retval -4: unable to open device
578 \retval -5: unable to claim device
579 \retval -6: reset failed
580 \retval -7: set baudrate failed
581 \retval -8: get product description failed
582 \retval -9: get serial number failed
583 \retval -11: libusb_init() failed
584 \retval -12: libusb_get_device_list() failed
585 \retval -13: libusb_get_device_descriptor() failed
587 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
588 const char* description, const char* serial)
590 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
594 Opens the index-th device with a given, vendor id, product id,
595 description and serial.
597 \param ftdi pointer to ftdi_context
598 \param vendor Vendor ID
599 \param product Product ID
600 \param description Description to search for. Use NULL if not needed.
601 \param serial Serial to search for. Use NULL if not needed.
602 \param index Number of matching device to open if there are more than one, starts with 0.
605 \retval -1: usb_find_busses() failed
606 \retval -2: usb_find_devices() failed
607 \retval -3: usb device not found
608 \retval -4: unable to open device
609 \retval -5: unable to claim device
610 \retval -6: reset failed
611 \retval -7: set baudrate failed
612 \retval -8: get product description failed
613 \retval -9: get serial number failed
614 \retval -10: unable to close device
615 \retval -11: ftdi context invalid
617 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
618 const char* description, const char* serial, unsigned int index)
621 libusb_device **devs;
625 if (libusb_init(NULL) < 0)
626 ftdi_error_return(-11, "libusb_init() failed");
628 if (libusb_get_device_list(NULL, &devs) < 0)
629 ftdi_error_return(-12, "libusb_get_device_list() failed");
632 ftdi_error_return(-11, "ftdi context invalid");
634 while ((dev = devs[i++]) != NULL)
636 struct libusb_device_descriptor desc;
638 if (libusb_get_device_descriptor(dev, &desc) < 0)
639 ftdi_error_return(-13, "libusb_get_device_descriptor() failed");
641 if (desc.idVendor == vendor && desc.idProduct == product)
643 if (libusb_open(dev, &ftdi->usb_dev) < 0)
644 ftdi_error_return(-4, "usb_open() failed");
646 if (description != NULL)
648 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
650 libusb_close (ftdi->usb_dev);
651 ftdi_error_return(-8, "unable to fetch product description");
653 if (strncmp(string, description, sizeof(string)) != 0)
655 libusb_close (ftdi->usb_dev);
661 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
663 ftdi_usb_close_internal (ftdi);
664 ftdi_error_return(-9, "unable to fetch serial number");
666 if (strncmp(string, serial, sizeof(string)) != 0)
668 ftdi_usb_close_internal (ftdi);
673 ftdi_usb_close_internal (ftdi);
681 return ftdi_usb_open_dev(ftdi, dev);
686 ftdi_error_return(-3, "device not found");
690 Opens the ftdi-device described by a description-string.
691 Intended to be used for parsing a device-description given as commandline argument.
693 \param ftdi pointer to ftdi_context
694 \param description NULL-terminated description-string, using this format:
695 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
696 \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")
697 \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
698 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
700 \note The description format may be extended in later versions.
703 \retval -1: libusb_init() failed
704 \retval -2: libusb_get_device_list() failed
705 \retval -3: usb device not found
706 \retval -4: unable to open device
707 \retval -5: unable to claim device
708 \retval -6: reset failed
709 \retval -7: set baudrate failed
710 \retval -8: get product description failed
711 \retval -9: get serial number failed
712 \retval -10: unable to close device
713 \retval -11: illegal description format
714 \retval -12: ftdi context invalid
716 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
719 ftdi_error_return(-12, "ftdi context invalid");
721 if (description[0] == 0 || description[1] != ':')
722 ftdi_error_return(-11, "illegal description format");
724 if (description[0] == 'd')
727 libusb_device **devs;
728 unsigned int bus_number, device_address;
731 if (libusb_init (NULL) < 0)
732 ftdi_error_return(-1, "libusb_init() failed");
734 if (libusb_get_device_list(NULL, &devs) < 0)
735 ftdi_error_return(-2, "libusb_get_device_list() failed");
737 /* XXX: This doesn't handle symlinks/odd paths/etc... */
738 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
739 ftdi_error_return(-11, "illegal description format");
741 while ((dev = devs[i++]) != NULL)
743 if (bus_number == libusb_get_bus_number (dev)
744 && device_address == libusb_get_device_address (dev))
745 return ftdi_usb_open_dev(ftdi, dev);
749 ftdi_error_return(-3, "device not found");
751 else if (description[0] == 'i' || description[0] == 's')
754 unsigned int product;
755 unsigned int index=0;
756 const char *serial=NULL;
757 const char *startp, *endp;
760 startp=description+2;
761 vendor=strtoul((char*)startp,(char**)&endp,0);
762 if (*endp != ':' || endp == startp || errno != 0)
763 ftdi_error_return(-11, "illegal description format");
766 product=strtoul((char*)startp,(char**)&endp,0);
767 if (endp == startp || errno != 0)
768 ftdi_error_return(-11, "illegal description format");
770 if (description[0] == 'i' && *endp != 0)
772 /* optional index field in i-mode */
774 ftdi_error_return(-11, "illegal description format");
777 index=strtoul((char*)startp,(char**)&endp,0);
778 if (*endp != 0 || endp == startp || errno != 0)
779 ftdi_error_return(-11, "illegal description format");
781 if (description[0] == 's')
784 ftdi_error_return(-11, "illegal description format");
786 /* rest of the description is the serial */
790 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
794 ftdi_error_return(-11, "illegal description format");
799 Resets the ftdi device.
801 \param ftdi pointer to ftdi_context
804 \retval -1: FTDI reset failed
805 \retval -2: USB device unavailable
807 int ftdi_usb_reset(struct ftdi_context *ftdi)
809 if (ftdi == NULL || ftdi->usb_dev == NULL)
810 ftdi_error_return(-2, "USB device unavailable");
812 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
813 SIO_RESET_REQUEST, SIO_RESET_SIO,
814 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
815 ftdi_error_return(-1,"FTDI reset failed");
817 // Invalidate data in the readbuffer
818 ftdi->readbuffer_offset = 0;
819 ftdi->readbuffer_remaining = 0;
825 Clears the read buffer on the chip and the internal read buffer.
827 \param ftdi pointer to ftdi_context
830 \retval -1: read buffer purge failed
831 \retval -2: USB device unavailable
833 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
835 if (ftdi == NULL || ftdi->usb_dev == NULL)
836 ftdi_error_return(-2, "USB device unavailable");
838 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
839 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
840 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
841 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
843 // Invalidate data in the readbuffer
844 ftdi->readbuffer_offset = 0;
845 ftdi->readbuffer_remaining = 0;
851 Clears the write buffer on the chip.
853 \param ftdi pointer to ftdi_context
856 \retval -1: write buffer purge failed
857 \retval -2: USB device unavailable
859 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
861 if (ftdi == NULL || ftdi->usb_dev == NULL)
862 ftdi_error_return(-2, "USB device unavailable");
864 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
865 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
866 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
867 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
873 Clears the buffers on the chip and the internal read buffer.
875 \param ftdi pointer to ftdi_context
878 \retval -1: read buffer purge failed
879 \retval -2: write buffer purge failed
880 \retval -3: USB device unavailable
882 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
886 if (ftdi == NULL || ftdi->usb_dev == NULL)
887 ftdi_error_return(-3, "USB device unavailable");
889 result = ftdi_usb_purge_rx_buffer(ftdi);
893 result = ftdi_usb_purge_tx_buffer(ftdi);
903 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
905 \param ftdi pointer to ftdi_context
908 \retval -1: usb_release failed
909 \retval -3: ftdi context invalid
911 int ftdi_usb_close(struct ftdi_context *ftdi)
916 ftdi_error_return(-3, "ftdi context invalid");
918 if (ftdi->usb_dev != NULL)
919 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
922 ftdi_usb_close_internal (ftdi);
928 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
929 Function is only used internally
932 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
933 unsigned short *value, unsigned short *index)
935 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
936 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
937 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
938 int divisor, best_divisor, best_baud, best_baud_diff;
939 unsigned long encoded_divisor;
948 divisor = 24000000 / baudrate;
950 if (ftdi->type == TYPE_AM)
952 // Round down to supported fraction (AM only)
953 divisor -= am_adjust_dn[divisor & 7];
956 // Try this divisor and the one above it (because division rounds down)
960 for (i = 0; i < 2; i++)
962 int try_divisor = divisor + i;
966 // Round up to supported divisor value
967 if (try_divisor <= 8)
969 // Round up to minimum supported divisor
972 else if (ftdi->type != TYPE_AM && try_divisor < 12)
974 // BM doesn't support divisors 9 through 11 inclusive
977 else if (divisor < 16)
979 // AM doesn't support divisors 9 through 15 inclusive
984 if (ftdi->type == TYPE_AM)
986 // Round up to supported fraction (AM only)
987 try_divisor += am_adjust_up[try_divisor & 7];
988 if (try_divisor > 0x1FFF8)
990 // Round down to maximum supported divisor value (for AM)
991 try_divisor = 0x1FFF8;
996 if (try_divisor > 0x1FFFF)
998 // Round down to maximum supported divisor value (for BM)
999 try_divisor = 0x1FFFF;
1003 // Get estimated baud rate (to nearest integer)
1004 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1005 // Get absolute difference from requested baud rate
1006 if (baud_estimate < baudrate)
1008 baud_diff = baudrate - baud_estimate;
1012 baud_diff = baud_estimate - baudrate;
1014 if (i == 0 || baud_diff < best_baud_diff)
1016 // Closest to requested baud rate so far
1017 best_divisor = try_divisor;
1018 best_baud = baud_estimate;
1019 best_baud_diff = baud_diff;
1022 // Spot on! No point trying
1027 // Encode the best divisor value
1028 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1029 // Deal with special cases for encoded value
1030 if (encoded_divisor == 1)
1032 encoded_divisor = 0; // 3000000 baud
1034 else if (encoded_divisor == 0x4001)
1036 encoded_divisor = 1; // 2000000 baud (BM only)
1038 // Split into "value" and "index" values
1039 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1040 if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
1042 *index = (unsigned short)(encoded_divisor >> 8);
1044 *index |= ftdi->index;
1047 *index = (unsigned short)(encoded_divisor >> 16);
1049 // Return the nearest baud rate
1054 Sets the chip baud rate
1056 \param ftdi pointer to ftdi_context
1057 \param baudrate baud rate to set
1060 \retval -1: invalid baudrate
1061 \retval -2: setting baudrate failed
1062 \retval -3: USB device unavailable
1064 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1066 unsigned short value, index;
1067 int actual_baudrate;
1069 if (ftdi == NULL || ftdi->usb_dev == NULL)
1070 ftdi_error_return(-3, "USB device unavailable");
1072 if (ftdi->bitbang_enabled)
1074 baudrate = baudrate*4;
1077 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1078 if (actual_baudrate <= 0)
1079 ftdi_error_return (-1, "Silly baudrate <= 0.");
1081 // Check within tolerance (about 5%)
1082 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1083 || ((actual_baudrate < baudrate)
1084 ? (actual_baudrate * 21 < baudrate * 20)
1085 : (baudrate * 21 < actual_baudrate * 20)))
1086 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1088 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1089 SIO_SET_BAUDRATE_REQUEST, value,
1090 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1091 ftdi_error_return (-2, "Setting new baudrate failed");
1093 ftdi->baudrate = baudrate;
1098 Set (RS232) line characteristics.
1099 The break type can only be set via ftdi_set_line_property2()
1100 and defaults to "off".
1102 \param ftdi pointer to ftdi_context
1103 \param bits Number of bits
1104 \param sbit Number of stop bits
1105 \param parity Parity mode
1108 \retval -1: Setting line property failed
1110 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1111 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1113 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1117 Set (RS232) line characteristics
1119 \param ftdi pointer to ftdi_context
1120 \param bits Number of bits
1121 \param sbit Number of stop bits
1122 \param parity Parity mode
1123 \param break_type Break type
1126 \retval -1: Setting line property failed
1127 \retval -2: USB device unavailable
1129 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1130 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1131 enum ftdi_break_type break_type)
1133 unsigned short value = bits;
1135 if (ftdi == NULL || ftdi->usb_dev == NULL)
1136 ftdi_error_return(-2, "USB device unavailable");
1141 value |= (0x00 << 8);
1144 value |= (0x01 << 8);
1147 value |= (0x02 << 8);
1150 value |= (0x03 << 8);
1153 value |= (0x04 << 8);
1160 value |= (0x00 << 11);
1163 value |= (0x01 << 11);
1166 value |= (0x02 << 11);
1173 value |= (0x00 << 14);
1176 value |= (0x01 << 14);
1180 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1181 SIO_SET_DATA_REQUEST, value,
1182 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1183 ftdi_error_return (-1, "Setting new line property failed");
1189 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1191 \param ftdi pointer to ftdi_context
1192 \param buf Buffer with the data
1193 \param size Size of the buffer
1195 \retval -666: USB device unavailable
1196 \retval <0: error code from usb_bulk_write()
1197 \retval >0: number of bytes written
1199 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1204 if (ftdi == NULL || ftdi->usb_dev == NULL)
1205 ftdi_error_return(-666, "USB device unavailable");
1207 while (offset < size)
1209 int write_size = ftdi->writebuffer_chunksize;
1211 if (offset+write_size > size)
1212 write_size = size-offset;
1214 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1215 ftdi_error_return(-1, "usb bulk write failed");
1217 offset += actual_length;
1223 #ifdef LIBFTDI_LINUX_ASYNC_MODE
1224 #ifdef USB_CLASS_PTP
1225 #error LIBFTDI_LINUX_ASYNC_MODE is not compatible with libusb-compat-0.1!
1227 static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1229 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1230 struct ftdi_context *ftdi = tc->ftdi;
1231 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1233 packet_size = ftdi->max_packet_size;
1235 actual_length = transfer->actual_length;
1237 if (actual_length > 2)
1239 // skip FTDI status bytes.
1240 // Maybe stored in the future to enable modem use
1241 num_of_chunks = actual_length / packet_size;
1242 chunk_remains = actual_length % packet_size;
1243 //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);
1245 ftdi->readbuffer_offset += 2;
1248 if (actual_length > packet_size - 2)
1250 for (i = 1; i < num_of_chunks; i++)
1251 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1252 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1254 if (chunk_remains > 2)
1256 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1257 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1259 actual_length -= 2*num_of_chunks;
1262 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1265 if (actual_length > 0)
1267 // data still fits in buf?
1268 if (tc->offset + actual_length <= tc->size)
1270 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1271 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1272 tc->offset += actual_length;
1274 ftdi->readbuffer_offset = 0;
1275 ftdi->readbuffer_remaining = 0;
1277 /* Did we read exactly the right amount of bytes? */
1278 if (tc->offset == tc->size)
1280 //printf("read_data exact rem %d offset %d\n",
1281 //ftdi->readbuffer_remaining, offset);
1288 // only copy part of the data or size <= readbuffer_chunksize
1289 int part_size = tc->size - tc->offset;
1290 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1291 tc->offset += part_size;
1293 ftdi->readbuffer_offset += part_size;
1294 ftdi->readbuffer_remaining = actual_length - part_size;
1296 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1297 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1303 ret = libusb_submit_transfer (transfer);
1309 static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1311 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1312 struct ftdi_context *ftdi = tc->ftdi;
1314 tc->offset = transfer->actual_length;
1316 if (tc->offset == tc->size)
1322 int write_size = ftdi->writebuffer_chunksize;
1325 if (tc->offset + write_size > tc->size)
1326 write_size = tc->size - tc->offset;
1328 transfer->length = write_size;
1329 transfer->buffer = tc->buf + tc->offset;
1330 ret = libusb_submit_transfer (transfer);
1338 Writes data to the chip. Does not wait for completion of the transfer
1339 nor does it make sure that the transfer was successful.
1341 Use libusb 1.0 Asynchronous API.
1342 Only available if compiled with --with-async-mode.
1344 \param ftdi pointer to ftdi_context
1345 \param buf Buffer with the data
1346 \param size Size of the buffer
1348 \retval NULL: Some error happens when submit transfer
1349 \retval !NULL: Pointer to a ftdi_transfer_control
1352 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1354 struct ftdi_transfer_control *tc;
1355 struct libusb_transfer *transfer = libusb_alloc_transfer(0);
1356 int write_size, ret;
1358 if (ftdi == NULL || ftdi->usb_dev == NULL)
1360 libusb_free_transfer(transfer);
1364 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1366 if (!tc || !transfer)
1375 if (size < ftdi->writebuffer_chunksize)
1378 write_size = ftdi->writebuffer_chunksize;
1380 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf, write_size, ftdi_write_data_cb, tc, ftdi->usb_write_timeout);
1381 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1383 ret = libusb_submit_transfer(transfer);
1386 libusb_free_transfer(transfer);
1388 tc->transfer = NULL;
1391 tc->transfer = transfer;
1397 Reads data from the chip. Does not wait for completion of the transfer
1398 nor does it make sure that the transfer was successful.
1400 Use libusb 1.0 Asynchronous API.
1401 Only available if compiled with --with-async-mode.
1403 \param ftdi pointer to ftdi_context
1404 \param buf Buffer with the data
1405 \param size Size of the buffer
1407 \retval NULL: Some error happens when submit transfer
1408 \retval !NULL: Pointer to a ftdi_transfer_control
1411 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1413 struct ftdi_transfer_control *tc;
1414 struct libusb_transfer *transfer;
1417 if (ftdi == NULL || ftdi->usb_dev == NULL)
1420 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1428 if (size <= ftdi->readbuffer_remaining)
1430 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1433 ftdi->readbuffer_remaining -= size;
1434 ftdi->readbuffer_offset += size;
1436 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1440 tc->transfer = NULL;
1445 if (ftdi->readbuffer_remaining != 0)
1447 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1449 tc->offset = ftdi->readbuffer_remaining;
1454 transfer = libusb_alloc_transfer(0);
1461 ftdi->readbuffer_remaining = 0;
1462 ftdi->readbuffer_offset = 0;
1464 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);
1465 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1467 ret = libusb_submit_transfer(transfer);
1470 libusb_free_transfer(transfer);
1474 tc->transfer = transfer;
1480 Wait for completion of the transfer.
1482 Use libusb 1.0 Asynchronous API.
1483 Only available if compiled with --with-async-mode.
1485 \param tc pointer to ftdi_transfer_control
1487 \retval < 0: Some error happens
1488 \retval >= 0: Data size transferred
1491 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1495 while (!tc->completed)
1497 ret = libusb_handle_events(NULL);
1500 if (ret == LIBUSB_ERROR_INTERRUPTED)
1502 libusb_cancel_transfer(tc->transfer);
1503 while (!tc->completed)
1504 if (libusb_handle_events(NULL) < 0)
1506 libusb_free_transfer(tc->transfer);
1513 if (tc->transfer->status == LIBUSB_TRANSFER_COMPLETED)
1518 libusb_free_transfer(tc->transfer);
1523 #endif // LIBFTDI_LINUX_ASYNC_MODE
1526 Configure write buffer chunk size.
1529 \param ftdi pointer to ftdi_context
1530 \param chunksize Chunk size
1533 \retval -1: ftdi context invalid
1535 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1538 ftdi_error_return(-1, "ftdi context invalid");
1540 ftdi->writebuffer_chunksize = chunksize;
1545 Get write buffer chunk size.
1547 \param ftdi pointer to ftdi_context
1548 \param chunksize Pointer to store chunk size in
1551 \retval -1: ftdi context invalid
1553 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1556 ftdi_error_return(-1, "ftdi context invalid");
1558 *chunksize = ftdi->writebuffer_chunksize;
1563 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1565 Automatically strips the two modem status bytes transfered during every read.
1567 \param ftdi pointer to ftdi_context
1568 \param buf Buffer to store data in
1569 \param size Size of the buffer
1571 \retval -666: USB device unavailable
1572 \retval <0: error code from libusb_bulk_transfer()
1573 \retval 0: no data was available
1574 \retval >0: number of bytes read
1577 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1579 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1580 int packet_size = ftdi->max_packet_size;
1581 int actual_length = 1;
1583 if (ftdi == NULL || ftdi->usb_dev == NULL)
1584 ftdi_error_return(-666, "USB device unavailable");
1586 // Packet size sanity check (avoid division by zero)
1587 if (packet_size == 0)
1588 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1590 // everything we want is still in the readbuffer?
1591 if (size <= ftdi->readbuffer_remaining)
1593 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1596 ftdi->readbuffer_remaining -= size;
1597 ftdi->readbuffer_offset += size;
1599 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1603 // something still in the readbuffer, but not enough to satisfy 'size'?
1604 if (ftdi->readbuffer_remaining != 0)
1606 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1609 offset += ftdi->readbuffer_remaining;
1611 // do the actual USB read
1612 while (offset < size && actual_length > 0)
1614 ftdi->readbuffer_remaining = 0;
1615 ftdi->readbuffer_offset = 0;
1616 /* returns how much received */
1617 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1619 ftdi_error_return(ret, "usb bulk read failed");
1621 if (actual_length > 2)
1623 // skip FTDI status bytes.
1624 // Maybe stored in the future to enable modem use
1625 num_of_chunks = actual_length / packet_size;
1626 chunk_remains = actual_length % packet_size;
1627 //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);
1629 ftdi->readbuffer_offset += 2;
1632 if (actual_length > packet_size - 2)
1634 for (i = 1; i < num_of_chunks; i++)
1635 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1636 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1638 if (chunk_remains > 2)
1640 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1641 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1643 actual_length -= 2*num_of_chunks;
1646 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1649 else if (actual_length <= 2)
1651 // no more data to read?
1654 if (actual_length > 0)
1656 // data still fits in buf?
1657 if (offset+actual_length <= size)
1659 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1660 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1661 offset += actual_length;
1663 /* Did we read exactly the right amount of bytes? */
1665 //printf("read_data exact rem %d offset %d\n",
1666 //ftdi->readbuffer_remaining, offset);
1671 // only copy part of the data or size <= readbuffer_chunksize
1672 int part_size = size-offset;
1673 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1675 ftdi->readbuffer_offset += part_size;
1676 ftdi->readbuffer_remaining = actual_length-part_size;
1677 offset += part_size;
1679 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1680 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1691 Configure read buffer chunk size.
1694 Automatically reallocates the buffer.
1696 \param ftdi pointer to ftdi_context
1697 \param chunksize Chunk size
1700 \retval -1: ftdi context invalid
1702 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1704 unsigned char *new_buf;
1707 ftdi_error_return(-1, "ftdi context invalid");
1709 // Invalidate all remaining data
1710 ftdi->readbuffer_offset = 0;
1711 ftdi->readbuffer_remaining = 0;
1713 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1714 which is defined in libusb-1.0. Otherwise, each USB read request will
1715 be divided into multiple URBs. This will cause issues on Linux kernel
1716 older than 2.6.32. */
1717 if (chunksize > 16384)
1721 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1722 ftdi_error_return(-1, "out of memory for readbuffer");
1724 ftdi->readbuffer = new_buf;
1725 ftdi->readbuffer_chunksize = chunksize;
1731 Get read buffer chunk size.
1733 \param ftdi pointer to ftdi_context
1734 \param chunksize Pointer to store chunk size in
1737 \retval -1: FTDI context invalid
1739 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1742 ftdi_error_return(-1, "FTDI context invalid");
1744 *chunksize = ftdi->readbuffer_chunksize;
1750 Enable bitbang mode.
1752 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1754 \param ftdi pointer to ftdi_context
1755 \param bitmask Bitmask to configure lines.
1756 HIGH/ON value configures a line as output.
1759 \retval -1: can't enable bitbang mode
1760 \retval -2: USB device unavailable
1762 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1764 unsigned short usb_val;
1766 if (ftdi == NULL || ftdi->usb_dev == NULL)
1767 ftdi_error_return(-2, "USB device unavailable");
1769 usb_val = bitmask; // low byte: bitmask
1770 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1771 usb_val |= (ftdi->bitbang_mode << 8);
1773 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1774 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1775 NULL, 0, ftdi->usb_write_timeout) < 0)
1776 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1778 ftdi->bitbang_enabled = 1;
1783 Disable bitbang mode.
1785 \param ftdi pointer to ftdi_context
1788 \retval -1: can't disable bitbang mode
1789 \retval -2: USB device unavailable
1791 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1793 if (ftdi == NULL || ftdi->usb_dev == NULL)
1794 ftdi_error_return(-2, "USB device unavailable");
1796 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)
1797 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1799 ftdi->bitbang_enabled = 0;
1804 Enable/disable bitbang modes.
1806 \param ftdi pointer to ftdi_context
1807 \param bitmask Bitmask to configure lines.
1808 HIGH/ON value configures a line as output.
1809 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1812 \retval -1: can't enable bitbang mode
1813 \retval -2: USB device unavailable
1815 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1817 unsigned short usb_val;
1819 if (ftdi == NULL || ftdi->usb_dev == NULL)
1820 ftdi_error_return(-2, "USB device unavailable");
1822 usb_val = bitmask; // low byte: bitmask
1823 usb_val |= (mode << 8);
1824 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)
1825 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?");
1827 ftdi->bitbang_mode = mode;
1828 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1833 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1835 \param ftdi pointer to ftdi_context
1836 \param pins Pointer to store pins into
1839 \retval -1: read pins failed
1840 \retval -2: USB device unavailable
1842 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1844 if (ftdi == NULL || ftdi->usb_dev == NULL)
1845 ftdi_error_return(-2, "USB device unavailable");
1847 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)
1848 ftdi_error_return(-1, "read pins failed");
1856 The FTDI chip keeps data in the internal buffer for a specific
1857 amount of time if the buffer is not full yet to decrease
1858 load on the usb bus.
1860 \param ftdi pointer to ftdi_context
1861 \param latency Value between 1 and 255
1864 \retval -1: latency out of range
1865 \retval -2: unable to set latency timer
1866 \retval -3: USB device unavailable
1868 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1870 unsigned short usb_val;
1873 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1875 if (ftdi == NULL || ftdi->usb_dev == NULL)
1876 ftdi_error_return(-3, "USB device unavailable");
1879 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)
1880 ftdi_error_return(-2, "unable to set latency timer");
1888 \param ftdi pointer to ftdi_context
1889 \param latency Pointer to store latency value in
1892 \retval -1: unable to get latency timer
1893 \retval -2: USB device unavailable
1895 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
1897 unsigned short usb_val;
1899 if (ftdi == NULL || ftdi->usb_dev == NULL)
1900 ftdi_error_return(-2, "USB device unavailable");
1902 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)
1903 ftdi_error_return(-1, "reading latency timer failed");
1905 *latency = (unsigned char)usb_val;
1910 Poll modem status information
1912 This function allows the retrieve the two status bytes of the device.
1913 The device sends these bytes also as a header for each read access
1914 where they are discarded by ftdi_read_data(). The chip generates
1915 the two stripped status bytes in the absence of data every 40 ms.
1917 Layout of the first byte:
1918 - B0..B3 - must be 0
1919 - B4 Clear to send (CTS)
1922 - B5 Data set ready (DTS)
1925 - B6 Ring indicator (RI)
1928 - B7 Receive line signal detect (RLSD)
1932 Layout of the second byte:
1933 - B0 Data ready (DR)
1934 - B1 Overrun error (OE)
1935 - B2 Parity error (PE)
1936 - B3 Framing error (FE)
1937 - B4 Break interrupt (BI)
1938 - B5 Transmitter holding register (THRE)
1939 - B6 Transmitter empty (TEMT)
1940 - B7 Error in RCVR FIFO
1942 \param ftdi pointer to ftdi_context
1943 \param status Pointer to store status information in. Must be two bytes.
1946 \retval -1: unable to retrieve status information
1947 \retval -2: USB device unavailable
1949 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
1953 if (ftdi == NULL || ftdi->usb_dev == NULL)
1954 ftdi_error_return(-2, "USB device unavailable");
1956 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)
1957 ftdi_error_return(-1, "getting modem status failed");
1959 *status = (usb_val[1] << 8) | usb_val[0];
1965 Set flowcontrol for ftdi chip
1967 \param ftdi pointer to ftdi_context
1968 \param flowctrl flow control to use. should be
1969 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
1972 \retval -1: set flow control failed
1973 \retval -2: USB device unavailable
1975 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
1977 if (ftdi == NULL || ftdi->usb_dev == NULL)
1978 ftdi_error_return(-2, "USB device unavailable");
1980 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1981 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
1982 NULL, 0, ftdi->usb_write_timeout) < 0)
1983 ftdi_error_return(-1, "set flow control failed");
1991 \param ftdi pointer to ftdi_context
1992 \param state state to set line to (1 or 0)
1995 \retval -1: set dtr failed
1996 \retval -2: USB device unavailable
1998 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2000 unsigned short usb_val;
2002 if (ftdi == NULL || ftdi->usb_dev == NULL)
2003 ftdi_error_return(-2, "USB device unavailable");
2006 usb_val = SIO_SET_DTR_HIGH;
2008 usb_val = SIO_SET_DTR_LOW;
2010 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2011 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2012 NULL, 0, ftdi->usb_write_timeout) < 0)
2013 ftdi_error_return(-1, "set dtr failed");
2021 \param ftdi pointer to ftdi_context
2022 \param state state to set line to (1 or 0)
2025 \retval -1: set rts failed
2026 \retval -2: USB device unavailable
2028 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2030 unsigned short usb_val;
2032 if (ftdi == NULL || ftdi->usb_dev == NULL)
2033 ftdi_error_return(-2, "USB device unavailable");
2036 usb_val = SIO_SET_RTS_HIGH;
2038 usb_val = SIO_SET_RTS_LOW;
2040 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2041 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2042 NULL, 0, ftdi->usb_write_timeout) < 0)
2043 ftdi_error_return(-1, "set of rts failed");
2049 Set dtr and rts line in one pass
2051 \param ftdi pointer to ftdi_context
2052 \param dtr DTR state to set line to (1 or 0)
2053 \param rts RTS state to set line to (1 or 0)
2056 \retval -1: set dtr/rts failed
2057 \retval -2: USB device unavailable
2059 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2061 unsigned short usb_val;
2063 if (ftdi == NULL || ftdi->usb_dev == NULL)
2064 ftdi_error_return(-2, "USB device unavailable");
2067 usb_val = SIO_SET_DTR_HIGH;
2069 usb_val = SIO_SET_DTR_LOW;
2072 usb_val |= SIO_SET_RTS_HIGH;
2074 usb_val |= SIO_SET_RTS_LOW;
2076 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2077 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2078 NULL, 0, ftdi->usb_write_timeout) < 0)
2079 ftdi_error_return(-1, "set of rts/dtr failed");
2085 Set the special event character
2087 \param ftdi pointer to ftdi_context
2088 \param eventch Event character
2089 \param enable 0 to disable the event character, non-zero otherwise
2092 \retval -1: unable to set event character
2093 \retval -2: USB device unavailable
2095 int ftdi_set_event_char(struct ftdi_context *ftdi,
2096 unsigned char eventch, unsigned char enable)
2098 unsigned short usb_val;
2100 if (ftdi == NULL || ftdi->usb_dev == NULL)
2101 ftdi_error_return(-2, "USB device unavailable");
2107 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)
2108 ftdi_error_return(-1, "setting event character failed");
2116 \param ftdi pointer to ftdi_context
2117 \param errorch Error character
2118 \param enable 0 to disable the error character, non-zero otherwise
2121 \retval -1: unable to set error character
2122 \retval -2: USB device unavailable
2124 int ftdi_set_error_char(struct ftdi_context *ftdi,
2125 unsigned char errorch, unsigned char enable)
2127 unsigned short usb_val;
2129 if (ftdi == NULL || ftdi->usb_dev == NULL)
2130 ftdi_error_return(-2, "USB device unavailable");
2136 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)
2137 ftdi_error_return(-1, "setting error character failed");
2145 \param ftdi pointer to ftdi_context
2146 \param eeprom Pointer to ftdi_eeprom
2150 void ftdi_eeprom_setsize(struct ftdi_context *ftdi, struct ftdi_eeprom *eeprom, int size)
2155 ftdi->eeprom_size=size;
2160 Init eeprom with default values.
2162 \param eeprom Pointer to ftdi_eeprom
2164 void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom)
2169 eeprom->vendor_id = 0x0403;
2170 eeprom->product_id = 0x6001;
2172 eeprom->self_powered = 1;
2173 eeprom->remote_wakeup = 1;
2174 eeprom->BM_type_chip = 1;
2176 eeprom->in_is_isochronous = 0;
2177 eeprom->out_is_isochronous = 0;
2178 eeprom->suspend_pull_downs = 0;
2180 eeprom->use_serial = 0;
2181 eeprom->change_usb_version = 0;
2182 eeprom->usb_version = 0x0200;
2183 eeprom->max_power = 0;
2185 eeprom->manufacturer = NULL;
2186 eeprom->product = NULL;
2187 eeprom->serial = NULL;
2189 eeprom->size = FTDI_DEFAULT_EEPROM_SIZE;
2193 Build binary output from ftdi_eeprom structure.
2194 Output is suitable for ftdi_write_eeprom().
2196 \param eeprom Pointer to ftdi_eeprom
2197 \param output Buffer of 128 bytes to store eeprom image to
2199 \retval >0: used eeprom size
2200 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2201 \retval -2: Invalid eeprom pointer
2203 int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output)
2206 unsigned short checksum, value;
2207 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2213 if (eeprom->manufacturer != NULL)
2214 manufacturer_size = strlen(eeprom->manufacturer);
2215 if (eeprom->product != NULL)
2216 product_size = strlen(eeprom->product);
2217 if (eeprom->serial != NULL)
2218 serial_size = strlen(eeprom->serial);
2220 size_check = eeprom->size;
2221 size_check -= 28; // 28 are always in use (fixed)
2223 // Top half of a 256byte eeprom is used just for strings and checksum
2224 // it seems that the FTDI chip will not read these strings from the lower half
2225 // Each string starts with two bytes; offset and type (0x03 for string)
2226 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2227 if (eeprom->size>=256)size_check = 120;
2228 size_check -= manufacturer_size*2;
2229 size_check -= product_size*2;
2230 size_check -= serial_size*2;
2232 // eeprom size exceeded?
2237 memset (output, 0, eeprom->size);
2239 // Addr 00: Stay 00 00
2240 // Addr 02: Vendor ID
2241 output[0x02] = eeprom->vendor_id;
2242 output[0x03] = eeprom->vendor_id >> 8;
2244 // Addr 04: Product ID
2245 output[0x04] = eeprom->product_id;
2246 output[0x05] = eeprom->product_id >> 8;
2248 // Addr 06: Device release number (0400h for BM features)
2249 output[0x06] = 0x00;
2251 if (eeprom->BM_type_chip == 1)
2252 output[0x07] = 0x04;
2254 output[0x07] = 0x02;
2256 // Addr 08: Config descriptor
2258 // Bit 6: 1 if this device is self powered, 0 if bus powered
2259 // Bit 5: 1 if this device uses remote wakeup
2260 // Bit 4: 1 if this device is battery powered
2262 if (eeprom->self_powered == 1)
2264 if (eeprom->remote_wakeup == 1)
2268 // Addr 09: Max power consumption: max power = value * 2 mA
2269 output[0x09] = eeprom->max_power;
2271 // Addr 0A: Chip configuration
2272 // Bit 7: 0 - reserved
2273 // Bit 6: 0 - reserved
2274 // Bit 5: 0 - reserved
2275 // Bit 4: 1 - Change USB version
2276 // Bit 3: 1 - Use the serial number string
2277 // Bit 2: 1 - Enable suspend pull downs for lower power
2278 // Bit 1: 1 - Out EndPoint is Isochronous
2279 // Bit 0: 1 - In EndPoint is Isochronous
2282 if (eeprom->in_is_isochronous == 1)
2284 if (eeprom->out_is_isochronous == 1)
2286 if (eeprom->suspend_pull_downs == 1)
2288 if (eeprom->use_serial == 1)
2290 if (eeprom->change_usb_version == 1)
2294 // Addr 0B: reserved
2295 output[0x0B] = 0x00;
2297 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2298 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2299 if (eeprom->change_usb_version == 1)
2301 output[0x0C] = eeprom->usb_version;
2302 output[0x0D] = eeprom->usb_version >> 8;
2306 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2307 // Addr 0F: Length of manufacturer string
2308 output[0x0F] = manufacturer_size*2 + 2;
2310 // Addr 10: Offset of the product string + 0x80, calculated later
2311 // Addr 11: Length of product string
2312 output[0x11] = product_size*2 + 2;
2314 // Addr 12: Offset of the serial string + 0x80, calculated later
2315 // Addr 13: Length of serial string
2316 output[0x13] = serial_size*2 + 2;
2320 if (eeprom->size>=256) i = 0x80;
2323 // Output manufacturer
2324 output[0x0E] = i | 0x80; // calculate offset
2325 output[i++] = manufacturer_size*2 + 2;
2326 output[i++] = 0x03; // type: string
2327 for (j = 0; j < manufacturer_size; j++)
2329 output[i] = eeprom->manufacturer[j], i++;
2330 output[i] = 0x00, i++;
2333 // Output product name
2334 output[0x10] = i | 0x80; // calculate offset
2335 output[i] = product_size*2 + 2, i++;
2336 output[i] = 0x03, i++;
2337 for (j = 0; j < product_size; j++)
2339 output[i] = eeprom->product[j], i++;
2340 output[i] = 0x00, i++;
2344 output[0x12] = i | 0x80; // calculate offset
2345 output[i] = serial_size*2 + 2, i++;
2346 output[i] = 0x03, i++;
2347 for (j = 0; j < serial_size; j++)
2349 output[i] = eeprom->serial[j], i++;
2350 output[i] = 0x00, i++;
2353 // calculate checksum
2356 for (i = 0; i < eeprom->size/2-1; i++)
2358 value = output[i*2];
2359 value += output[(i*2)+1] << 8;
2361 checksum = value^checksum;
2362 checksum = (checksum << 1) | (checksum >> 15);
2365 output[eeprom->size-2] = checksum;
2366 output[eeprom->size-1] = checksum >> 8;
2372 Decode binary EEPROM image into an ftdi_eeprom structure.
2374 \param eeprom Pointer to ftdi_eeprom which will be filled in.
2375 \param buf Buffer of \a size bytes of raw eeprom data
2376 \param size size size of eeprom data in bytes
2379 \retval -1: something went wrong
2381 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2382 FIXME: Strings are malloc'ed here and should be freed somewhere
2384 int ftdi_eeprom_decode(struct ftdi_eeprom *eeprom, unsigned char *buf, int size)
2387 unsigned short checksum, eeprom_checksum, value;
2388 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2389 int eeprom_size = 128;
2394 size_check = eeprom->size;
2395 size_check -= 28; // 28 are always in use (fixed)
2397 // Top half of a 256byte eeprom is used just for strings and checksum
2398 // it seems that the FTDI chip will not read these strings from the lower half
2399 // Each string starts with two bytes; offset and type (0x03 for string)
2400 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2401 if (eeprom->size>=256)size_check = 120;
2402 size_check -= manufacturer_size*2;
2403 size_check -= product_size*2;
2404 size_check -= serial_size*2;
2406 // eeprom size exceeded?
2411 // empty eeprom struct
2412 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2414 // Addr 00: Stay 00 00
2416 // Addr 02: Vendor ID
2417 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2419 // Addr 04: Product ID
2420 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2422 value = buf[0x06] + (buf[0x07]<<8);
2426 eeprom->BM_type_chip = 1;
2429 eeprom->BM_type_chip = 0;
2431 default: // Unknown device
2432 eeprom->BM_type_chip = 0;
2436 // Addr 08: Config descriptor
2438 // Bit 6: 1 if this device is self powered, 0 if bus powered
2439 // Bit 5: 1 if this device uses remote wakeup
2440 // Bit 4: 1 if this device is battery powered
2442 if (j&0x40) eeprom->self_powered = 1;
2443 if (j&0x20) eeprom->remote_wakeup = 1;
2445 // Addr 09: Max power consumption: max power = value * 2 mA
2446 eeprom->max_power = buf[0x09];
2448 // Addr 0A: Chip configuration
2449 // Bit 7: 0 - reserved
2450 // Bit 6: 0 - reserved
2451 // Bit 5: 0 - reserved
2452 // Bit 4: 1 - Change USB version
2453 // Bit 3: 1 - Use the serial number string
2454 // Bit 2: 1 - Enable suspend pull downs for lower power
2455 // Bit 1: 1 - Out EndPoint is Isochronous
2456 // Bit 0: 1 - In EndPoint is Isochronous
2459 if (j&0x01) eeprom->in_is_isochronous = 1;
2460 if (j&0x02) eeprom->out_is_isochronous = 1;
2461 if (j&0x04) eeprom->suspend_pull_downs = 1;
2462 if (j&0x08) eeprom->use_serial = 1;
2463 if (j&0x10) eeprom->change_usb_version = 1;
2465 // Addr 0B: reserved
2467 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2468 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2469 if (eeprom->change_usb_version == 1)
2471 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2474 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2475 // Addr 0F: Length of manufacturer string
2476 manufacturer_size = buf[0x0F]/2;
2477 if (manufacturer_size > 0) eeprom->manufacturer = malloc(manufacturer_size);
2478 else eeprom->manufacturer = NULL;
2480 // Addr 10: Offset of the product string + 0x80, calculated later
2481 // Addr 11: Length of product string
2482 product_size = buf[0x11]/2;
2483 if (product_size > 0) eeprom->product = malloc(product_size);
2484 else eeprom->product = NULL;
2486 // Addr 12: Offset of the serial string + 0x80, calculated later
2487 // Addr 13: Length of serial string
2488 serial_size = buf[0x13]/2;
2489 if (serial_size > 0) eeprom->serial = malloc(serial_size);
2490 else eeprom->serial = NULL;
2492 // Decode manufacturer
2493 i = buf[0x0E] & 0x7f; // offset
2494 for (j=0;j<manufacturer_size-1;j++)
2496 eeprom->manufacturer[j] = buf[2*j+i+2];
2498 eeprom->manufacturer[j] = '\0';
2500 // Decode product name
2501 i = buf[0x10] & 0x7f; // offset
2502 for (j=0;j<product_size-1;j++)
2504 eeprom->product[j] = buf[2*j+i+2];
2506 eeprom->product[j] = '\0';
2509 i = buf[0x12] & 0x7f; // offset
2510 for (j=0;j<serial_size-1;j++)
2512 eeprom->serial[j] = buf[2*j+i+2];
2514 eeprom->serial[j] = '\0';
2519 for (i = 0; i < eeprom_size/2-1; i++)
2522 value += buf[(i*2)+1] << 8;
2524 checksum = value^checksum;
2525 checksum = (checksum << 1) | (checksum >> 15);
2528 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
2530 if (eeprom_checksum != checksum)
2532 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
2540 Read eeprom location
2542 \param ftdi pointer to ftdi_context
2543 \param eeprom_addr Address of eeprom location to be read
2544 \param eeprom_val Pointer to store read eeprom location
2547 \retval -1: read failed
2548 \retval -2: USB device unavailable
2550 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
2552 if (ftdi == NULL || ftdi->usb_dev == NULL)
2553 ftdi_error_return(-2, "USB device unavailable");
2555 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)
2556 ftdi_error_return(-1, "reading eeprom failed");
2564 \param ftdi pointer to ftdi_context
2565 \param eeprom Pointer to store eeprom into
2568 \retval -1: read failed
2569 \retval -2: USB device unavailable
2571 int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2575 if (ftdi == NULL || ftdi->usb_dev == NULL)
2576 ftdi_error_return(-2, "USB device unavailable");
2578 for (i = 0; i < ftdi->eeprom_size/2; i++)
2580 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)
2581 ftdi_error_return(-1, "reading eeprom failed");
2588 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
2589 Function is only used internally
2592 static unsigned char ftdi_read_chipid_shift(unsigned char value)
2594 return ((value & 1) << 1) |
2595 ((value & 2) << 5) |
2596 ((value & 4) >> 2) |
2597 ((value & 8) << 4) |
2598 ((value & 16) >> 1) |
2599 ((value & 32) >> 1) |
2600 ((value & 64) >> 4) |
2601 ((value & 128) >> 2);
2605 Read the FTDIChip-ID from R-type devices
2607 \param ftdi pointer to ftdi_context
2608 \param chipid Pointer to store FTDIChip-ID
2611 \retval -1: read failed
2612 \retval -2: USB device unavailable
2614 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
2616 unsigned int a = 0, b = 0;
2618 if (ftdi == NULL || ftdi->usb_dev == NULL)
2619 ftdi_error_return(-2, "USB device unavailable");
2621 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)
2623 a = a << 8 | a >> 8;
2624 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)
2626 b = b << 8 | b >> 8;
2627 a = (a << 16) | (b & 0xFFFF);
2628 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
2629 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
2630 *chipid = a ^ 0xa5f0f7d1;
2635 ftdi_error_return(-1, "read of FTDIChip-ID failed");
2639 Guesses size of eeprom by reading eeprom and comparing halves - will not work with blank eeprom
2640 Call this function then do a write then call again to see if size changes, if so write again.
2642 \param ftdi pointer to ftdi_context
2643 \param eeprom Pointer to store eeprom into
2644 \param maxsize the size of the buffer to read into
2646 \retval -1: eeprom read failed
2647 \retval -2: USB device unavailable
2648 \retval >=0: size of eeprom
2650 int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize)
2652 int i=0,j,minsize=32;
2655 if (ftdi == NULL || ftdi->usb_dev == NULL)
2656 ftdi_error_return(-2, "USB device unavailable");
2660 for (j = 0; i < maxsize/2 && j<size; j++)
2662 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,
2663 SIO_READ_EEPROM_REQUEST, 0, i,
2664 eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2665 ftdi_error_return(-1, "eeprom read failed");
2670 while (size<=maxsize && memcmp(eeprom,&eeprom[size/2],size/2)!=0);
2676 Write eeprom location
2678 \param ftdi pointer to ftdi_context
2679 \param eeprom_addr Address of eeprom location to be written
2680 \param eeprom_val Value to be written
2683 \retval -1: read failed
2684 \retval -2: USB device unavailable
2686 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr, unsigned short eeprom_val)
2688 if (ftdi == NULL || ftdi->usb_dev == NULL)
2689 ftdi_error_return(-2, "USB device unavailable");
2691 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2692 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
2693 NULL, 0, ftdi->usb_write_timeout) != 0)
2694 ftdi_error_return(-1, "unable to write eeprom");
2702 \param ftdi pointer to ftdi_context
2703 \param eeprom Pointer to read eeprom from
2706 \retval -1: read failed
2707 \retval -2: USB device unavailable
2709 int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2711 unsigned short usb_val, status;
2714 if (ftdi == NULL || ftdi->usb_dev == NULL)
2715 ftdi_error_return(-2, "USB device unavailable");
2717 /* These commands were traced while running MProg */
2718 if ((ret = ftdi_usb_reset(ftdi)) != 0)
2720 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
2722 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
2725 for (i = 0; i < ftdi->eeprom_size/2; i++)
2727 usb_val = eeprom[i*2];
2728 usb_val += eeprom[(i*2)+1] << 8;
2729 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2730 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
2731 NULL, 0, ftdi->usb_write_timeout) < 0)
2732 ftdi_error_return(-1, "unable to write eeprom");
2741 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
2743 \param ftdi pointer to ftdi_context
2746 \retval -1: erase failed
2747 \retval -2: USB device unavailable
2749 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
2751 if (ftdi == NULL || ftdi->usb_dev == NULL)
2752 ftdi_error_return(-2, "USB device unavailable");
2754 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST, 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
2755 ftdi_error_return(-1, "unable to erase eeprom");
2761 Get string representation for last error code
2763 \param ftdi pointer to ftdi_context
2765 \retval Pointer to error string
2767 char *ftdi_get_error_string (struct ftdi_context *ftdi)
2772 return ftdi->error_str;
2775 /* @} end of doxygen libftdi group */