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 */
38 /* stuff needed for async write */
39 #ifdef LIBFTDI_LINUX_ASYNC_MODE
40 #include <sys/ioctl.h>
41 #include <sys/select.h>
42 #include <sys/types.h>
44 #include <linux/usbdevice_fs.h>
47 #define ftdi_error_return(code, str) do { \
48 ftdi->error_str = str; \
53 #if defined( __WIN32__) && !defined(__MINGW32__)
55 #define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
60 int gettimeofday( struct timeval *tv, void null)
63 unsigned __int64 tmpres = 0;
66 GetSystemTimeAsFileTime(&ft);
67 tmpres |= ft.dwHighDateTime;
69 tmpres |= ft.dwLowDateTime;
71 /*converting file time to unix epoch*/
72 tmpres /= 10; /*convert into microseconds*/
73 tmpres -= DELTA_EPOCH_IN_MICROSECS;
74 tv->tv_sec = (LONG)(tmpres / 1000000UL);
75 tv->tv_usec = (LONG)(tmpres % 1000000UL);
77 /* Warning: Timezone not handled (and not needed here) */
81 // Include sys/time.h on non-Windows platforms
82 // as gettimeofday() needs it.
87 Internal function to close usb device pointer.
88 Sets ftdi->usb_dev to NULL.
91 \param ftdi pointer to ftdi_context
93 \retval zero if all is fine, otherwise error code from usb_close()
95 static int ftdi_usb_close_internal (struct ftdi_context *ftdi)
99 if (ftdi && ftdi->usb_dev)
101 ret = usb_close (ftdi->usb_dev);
102 ftdi->usb_dev = NULL;
109 Initializes a ftdi_context.
111 \param ftdi pointer to ftdi_context
114 \retval -1: couldn't allocate read buffer
116 \remark This should be called before all functions
118 int ftdi_init(struct ftdi_context *ftdi)
122 ftdi->usb_dev = NULL;
123 ftdi->usb_read_timeout = 5000;
124 ftdi->usb_write_timeout = 5000;
126 ftdi->type = TYPE_BM; /* chip type */
128 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
130 ftdi->readbuffer = NULL;
131 ftdi->readbuffer_offset = 0;
132 ftdi->readbuffer_remaining = 0;
133 ftdi->writebuffer_chunksize = 4096;
134 ftdi->max_packet_size = 0;
140 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
142 ftdi->error_str = NULL;
144 #ifdef LIBFTDI_LINUX_ASYNC_MODE
145 ftdi->async_usb_buffer_size=10;
146 if ((ftdi->async_usb_buffer=malloc(sizeof(struct usbdevfs_urb)*ftdi->async_usb_buffer_size)) == NULL)
147 ftdi_error_return(-1, "out of memory for async usb buffer");
149 /* initialize async usb buffer with unused-marker */
150 for (i=0; i < ftdi->async_usb_buffer_size; i++)
151 ((struct usbdevfs_urb*)ftdi->async_usb_buffer)[i].usercontext = FTDI_URB_USERCONTEXT_COOKIE;
153 ftdi->async_usb_buffer_size=0;
154 ftdi->async_usb_buffer = NULL;
157 ftdi->eeprom_size = FTDI_DEFAULT_EEPROM_SIZE;
159 /* All fine. Now allocate the readbuffer */
160 return ftdi_read_data_set_chunksize(ftdi, 4096);
164 Allocate and initialize a new ftdi_context
166 \return a pointer to a new ftdi_context, or NULL on failure
168 struct ftdi_context *ftdi_new(void)
170 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
177 if (ftdi_init(ftdi) != 0)
187 Open selected channels on a chip, otherwise use first channel.
189 \param ftdi pointer to ftdi_context
190 \param interface Interface to use for FT2232C/2232H/4232H chips.
193 \retval -1: unknown interface
194 \retval -2: USB device unavailable
196 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
199 ftdi_error_return(-2, "USB device unavailable");
205 /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */
209 ftdi->index = INTERFACE_B;
215 ftdi->index = INTERFACE_C;
221 ftdi->index = INTERFACE_D;
226 ftdi_error_return(-1, "Unknown interface");
232 Deinitializes a ftdi_context.
234 \param ftdi pointer to ftdi_context
236 void ftdi_deinit(struct ftdi_context *ftdi)
241 ftdi_usb_close_internal (ftdi);
243 if (ftdi->async_usb_buffer != NULL)
245 free(ftdi->async_usb_buffer);
246 ftdi->async_usb_buffer = NULL;
249 if (ftdi->readbuffer != NULL)
251 free(ftdi->readbuffer);
252 ftdi->readbuffer = NULL;
257 Deinitialize and free an ftdi_context.
259 \param ftdi pointer to ftdi_context
261 void ftdi_free(struct ftdi_context *ftdi)
268 Use an already open libusb device.
270 \param ftdi pointer to ftdi_context
271 \param usb libusb usb_dev_handle to use
273 void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb)
283 Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which
284 needs to be deallocated by ftdi_list_free() after use.
286 \param ftdi pointer to ftdi_context
287 \param devlist Pointer where to store list of found devices
288 \param vendor Vendor ID to search for
289 \param product Product ID to search for
291 \retval >0: number of devices found
292 \retval -1: usb_find_busses() failed
293 \retval -2: usb_find_devices() failed
294 \retval -3: out of memory
296 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
298 struct ftdi_device_list **curdev;
300 struct usb_device *dev;
304 if (usb_find_busses() < 0)
305 ftdi_error_return(-1, "usb_find_busses() failed");
306 if (usb_find_devices() < 0)
307 ftdi_error_return(-2, "usb_find_devices() failed");
311 for (bus = usb_get_busses(); bus; bus = bus->next)
313 for (dev = bus->devices; dev; dev = dev->next)
315 if (dev->descriptor.idVendor == vendor
316 && dev->descriptor.idProduct == product)
318 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
320 ftdi_error_return(-3, "out of memory");
322 (*curdev)->next = NULL;
323 (*curdev)->dev = dev;
325 curdev = &(*curdev)->next;
335 Frees a usb device list.
337 \param devlist USB device list created by ftdi_usb_find_all()
339 void ftdi_list_free(struct ftdi_device_list **devlist)
341 struct ftdi_device_list *curdev, *next;
343 for (curdev = *devlist; curdev != NULL;)
354 Frees a usb device list.
356 \param devlist USB device list created by ftdi_usb_find_all()
358 void ftdi_list_free2(struct ftdi_device_list *devlist)
360 ftdi_list_free(&devlist);
364 Return device ID strings from the usb device.
366 The parameters manufacturer, description and serial may be NULL
367 or pointer to buffers to store the fetched strings.
369 \note Use this function only in combination with ftdi_usb_find_all()
370 as it closes the internal "usb_dev" after use.
372 \param ftdi pointer to ftdi_context
373 \param dev libusb usb_dev to use
374 \param manufacturer Store manufacturer string here if not NULL
375 \param mnf_len Buffer size of manufacturer string
376 \param description Store product description string here if not NULL
377 \param desc_len Buffer size of product description string
378 \param serial Store serial string here if not NULL
379 \param serial_len Buffer size of serial string
382 \retval -1: wrong arguments
383 \retval -4: unable to open device
384 \retval -7: get product manufacturer failed
385 \retval -8: get product description failed
386 \retval -9: get serial number failed
387 \retval -10: unable to close device
389 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct usb_device * dev,
390 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
392 if ((ftdi==NULL) || (dev==NULL))
395 if (!(ftdi->usb_dev = usb_open(dev)))
396 ftdi_error_return(-4, usb_strerror());
398 if (manufacturer != NULL)
400 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iManufacturer, manufacturer, mnf_len) <= 0)
402 ftdi_usb_close_internal (ftdi);
403 ftdi_error_return(-7, usb_strerror());
407 if (description != NULL)
409 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, description, desc_len) <= 0)
411 ftdi_usb_close_internal (ftdi);
412 ftdi_error_return(-8, usb_strerror());
418 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, serial, serial_len) <= 0)
420 ftdi_usb_close_internal (ftdi);
421 ftdi_error_return(-9, usb_strerror());
425 if (ftdi_usb_close_internal (ftdi) != 0)
426 ftdi_error_return(-10, usb_strerror());
432 * Internal function to determine the maximum packet size.
433 * \param ftdi pointer to ftdi_context
434 * \param dev libusb usb_dev to use
435 * \retval Maximum packet size for this device
437 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, struct usb_device *dev)
439 unsigned int packet_size;
442 if (ftdi == NULL || dev == NULL)
445 // Determine maximum packet size. Init with default value.
446 // New hi-speed devices from FTDI use a packet size of 512 bytes
447 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
448 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
453 if (dev->descriptor.bNumConfigurations > 0 && dev->config)
455 struct usb_config_descriptor config = dev->config[0];
457 if (ftdi->interface < config.bNumInterfaces)
459 struct usb_interface interface = config.interface[ftdi->interface];
460 if (interface.num_altsetting > 0)
462 struct usb_interface_descriptor descriptor = interface.altsetting[0];
463 if (descriptor.bNumEndpoints > 0)
465 packet_size = descriptor.endpoint[0].wMaxPacketSize;
475 Opens a ftdi device given by an usb_device.
477 \param ftdi pointer to ftdi_context
478 \param dev libusb usb_dev to use
481 \retval -3: unable to config device
482 \retval -4: unable to open device
483 \retval -5: unable to claim device
484 \retval -6: reset failed
485 \retval -7: set baudrate failed
486 \retval -8: ftdi context invalid
488 int ftdi_usb_open_dev(struct ftdi_context *ftdi, struct usb_device *dev)
490 int detach_errno = 0;
494 ftdi_error_return(-8, "ftdi context invalid");
496 if (!(ftdi->usb_dev = usb_open(dev)))
497 ftdi_error_return(-4, "usb_open() failed");
499 #ifdef LIBUSB_HAS_GET_DRIVER_NP
500 // Try to detach ftdi_sio kernel module.
501 // Returns ENODATA if driver is not loaded.
503 // The return code is kept in a separate variable and only parsed
504 // if usb_set_configuration() or usb_claim_interface() fails as the
505 // detach operation might be denied and everything still works fine.
506 // Likely scenario is a static ftdi_sio kernel module.
507 if (usb_detach_kernel_driver_np(ftdi->usb_dev, ftdi->interface) != 0 && errno != ENODATA)
508 detach_errno = errno;
512 // set configuration (needed especially for windows)
513 // tolerate EBUSY: one device with one configuration, but two interfaces
514 // and libftdi sessions to both interfaces (e.g. FT2232)
516 if (dev->descriptor.bNumConfigurations > 0)
518 // libusb-win32 on Windows 64 can return a null pointer for a valid device
520 config_val = dev->config[0].bConfigurationValue;
522 if (usb_set_configuration(ftdi->usb_dev, config_val) &&
525 ftdi_usb_close_internal (ftdi);
526 if (detach_errno == EPERM)
528 ftdi_error_return(-8, "inappropriate permissions on device!");
532 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
538 if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0)
540 ftdi_usb_close_internal (ftdi);
541 if (detach_errno == EPERM)
543 ftdi_error_return(-8, "inappropriate permissions on device!");
547 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
551 if (ftdi_usb_reset (ftdi) != 0)
553 ftdi_usb_close_internal (ftdi);
554 ftdi_error_return(-6, "ftdi_usb_reset failed");
557 // Try to guess chip type
558 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
559 if (dev->descriptor.bcdDevice == 0x400 || (dev->descriptor.bcdDevice == 0x200
560 && dev->descriptor.iSerialNumber == 0))
561 ftdi->type = TYPE_BM;
562 else if (dev->descriptor.bcdDevice == 0x200)
563 ftdi->type = TYPE_AM;
564 else if (dev->descriptor.bcdDevice == 0x500)
565 ftdi->type = TYPE_2232C;
566 else if (dev->descriptor.bcdDevice == 0x600)
568 else if (dev->descriptor.bcdDevice == 0x700)
569 ftdi->type = TYPE_2232H;
570 else if (dev->descriptor.bcdDevice == 0x800)
571 ftdi->type = TYPE_4232H;
573 // Set default interface on dual/quad type chips
580 ftdi->index = INTERFACE_A;
586 // Determine maximum packet size
587 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
589 if (ftdi_set_baudrate (ftdi, 9600) != 0)
591 ftdi_usb_close_internal (ftdi);
592 ftdi_error_return(-7, "set baudrate failed");
595 ftdi_error_return(0, "all fine");
599 Opens the first device with a given vendor and product ids.
601 \param ftdi pointer to ftdi_context
602 \param vendor Vendor ID
603 \param product Product ID
605 \retval same as ftdi_usb_open_desc()
607 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
609 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
613 Opens the first device with a given, vendor id, product id,
614 description and serial.
616 \param ftdi pointer to ftdi_context
617 \param vendor Vendor ID
618 \param product Product ID
619 \param description Description to search for. Use NULL if not needed.
620 \param serial Serial to search for. Use NULL if not needed.
623 \retval -1: usb_find_busses() failed
624 \retval -2: usb_find_devices() failed
625 \retval -3: usb device not found
626 \retval -4: unable to open device
627 \retval -5: unable to claim device
628 \retval -6: reset failed
629 \retval -7: set baudrate failed
630 \retval -8: get product description failed
631 \retval -9: get serial number failed
632 \retval -10: unable to close device
634 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
635 const char* description, const char* serial)
637 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
641 Opens the index-th device with a given, vendor id, product id,
642 description and serial.
644 \param ftdi pointer to ftdi_context
645 \param vendor Vendor ID
646 \param product Product ID
647 \param description Description to search for. Use NULL if not needed.
648 \param serial Serial to search for. Use NULL if not needed.
649 \param index Number of matching device to open if there are more than one, starts with 0.
652 \retval -1: usb_find_busses() failed
653 \retval -2: usb_find_devices() failed
654 \retval -3: usb device not found
655 \retval -4: unable to open device
656 \retval -5: unable to claim device
657 \retval -6: reset failed
658 \retval -7: set baudrate failed
659 \retval -8: get product description failed
660 \retval -9: get serial number failed
661 \retval -10: unable to close device
662 \retval -11: ftdi context invalid
664 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
665 const char* description, const char* serial, unsigned int index)
668 struct usb_device *dev;
673 if (usb_find_busses() < 0)
674 ftdi_error_return(-1, "usb_find_busses() failed");
675 if (usb_find_devices() < 0)
676 ftdi_error_return(-2, "usb_find_devices() failed");
679 ftdi_error_return(-11, "ftdi context invalid");
681 for (bus = usb_get_busses(); bus; bus = bus->next)
683 for (dev = bus->devices; dev; dev = dev->next)
685 if (dev->descriptor.idVendor == vendor
686 && dev->descriptor.idProduct == product)
688 if (!(ftdi->usb_dev = usb_open(dev)))
689 ftdi_error_return(-4, "usb_open() failed");
691 if (description != NULL)
693 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, string, sizeof(string)) <= 0)
695 ftdi_usb_close_internal (ftdi);
696 ftdi_error_return(-8, "unable to fetch product description");
698 if (strncmp(string, description, sizeof(string)) != 0)
700 if (ftdi_usb_close_internal (ftdi) != 0)
701 ftdi_error_return(-10, "unable to close device");
707 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, string, sizeof(string)) <= 0)
709 ftdi_usb_close_internal (ftdi);
710 ftdi_error_return(-9, "unable to fetch serial number");
712 if (strncmp(string, serial, sizeof(string)) != 0)
714 if (ftdi_usb_close_internal (ftdi) != 0)
715 ftdi_error_return(-10, "unable to close device");
720 if (ftdi_usb_close_internal (ftdi) != 0)
721 ftdi_error_return(-10, "unable to close device");
729 return ftdi_usb_open_dev(ftdi, dev);
735 ftdi_error_return(-3, "device not found");
739 Opens the ftdi-device described by a description-string.
740 Intended to be used for parsing a device-description given as commandline argument.
742 \param ftdi pointer to ftdi_context
743 \param description NULL-terminated description-string, using this format:
744 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
745 \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")
746 \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
747 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
749 \note The description format may be extended in later versions.
752 \retval -1: usb_find_busses() failed
753 \retval -2: usb_find_devices() failed
754 \retval -3: usb device not found
755 \retval -4: unable to open device
756 \retval -5: unable to claim device
757 \retval -6: reset failed
758 \retval -7: set baudrate failed
759 \retval -8: get product description failed
760 \retval -9: get serial number failed
761 \retval -10: unable to close device
762 \retval -11: illegal description format
763 \retval -12: ftdi context invalid
765 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
768 ftdi_error_return(-12, "ftdi context invalid");
770 if (description[0] == 0 || description[1] != ':')
771 ftdi_error_return(-11, "illegal description format");
773 if (description[0] == 'd')
776 struct usb_device *dev;
780 if (usb_find_busses() < 0)
781 ftdi_error_return(-1, "usb_find_busses() failed");
782 if (usb_find_devices() < 0)
783 ftdi_error_return(-2, "usb_find_devices() failed");
785 for (bus = usb_get_busses(); bus; bus = bus->next)
787 for (dev = bus->devices; dev; dev = dev->next)
789 /* XXX: This doesn't handle symlinks/odd paths/etc... */
790 const char *desc = description + 2;
791 size_t len = strlen(bus->dirname);
792 if (strncmp(desc, bus->dirname, len))
798 if (strcmp(desc, dev->filename))
800 return ftdi_usb_open_dev(ftdi, dev);
805 ftdi_error_return(-3, "device not found");
807 else if (description[0] == 'i' || description[0] == 's')
810 unsigned int product;
811 unsigned int index=0;
812 const char *serial=NULL;
813 const char *startp, *endp;
816 startp=description+2;
817 vendor=strtoul((char*)startp,(char**)&endp,0);
818 if (*endp != ':' || endp == startp || errno != 0)
819 ftdi_error_return(-11, "illegal description format");
822 product=strtoul((char*)startp,(char**)&endp,0);
823 if (endp == startp || errno != 0)
824 ftdi_error_return(-11, "illegal description format");
826 if (description[0] == 'i' && *endp != 0)
828 /* optional index field in i-mode */
830 ftdi_error_return(-11, "illegal description format");
833 index=strtoul((char*)startp,(char**)&endp,0);
834 if (*endp != 0 || endp == startp || errno != 0)
835 ftdi_error_return(-11, "illegal description format");
837 if (description[0] == 's')
840 ftdi_error_return(-11, "illegal description format");
842 /* rest of the description is the serial */
846 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
850 ftdi_error_return(-11, "illegal description format");
855 Resets the ftdi device.
857 \param ftdi pointer to ftdi_context
860 \retval -1: FTDI reset failed
861 \retval -2: USB device unavailable
863 int ftdi_usb_reset(struct ftdi_context *ftdi)
865 if (ftdi == NULL || ftdi->usb_dev == NULL)
866 ftdi_error_return(-2, "USB device unavailable");
868 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
869 SIO_RESET_REQUEST, SIO_RESET_SIO,
870 ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
871 ftdi_error_return(-1,"FTDI reset failed");
873 // Invalidate data in the readbuffer
874 ftdi->readbuffer_offset = 0;
875 ftdi->readbuffer_remaining = 0;
881 Clears the read buffer on the chip and the internal read buffer.
883 \param ftdi pointer to ftdi_context
886 \retval -1: read buffer purge failed
887 \retval -2: USB device unavailable
889 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
891 if (ftdi == NULL || ftdi->usb_dev == NULL)
892 ftdi_error_return(-2, "USB device unavailable");
894 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
895 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
896 ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
897 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
899 // Invalidate data in the readbuffer
900 ftdi->readbuffer_offset = 0;
901 ftdi->readbuffer_remaining = 0;
907 Clears the write buffer on the chip.
909 \param ftdi pointer to ftdi_context
912 \retval -1: write buffer purge failed
913 \retval -2: USB device unavailable
915 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
917 if (ftdi == NULL || ftdi->usb_dev == NULL)
918 ftdi_error_return(-2, "USB device unavailable");
920 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
921 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
922 ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
923 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
929 Clears the buffers on the chip and the internal read buffer.
931 \param ftdi pointer to ftdi_context
934 \retval -1: read buffer purge failed
935 \retval -2: write buffer purge failed
936 \retval -3: USB device unavailable
938 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
942 if (ftdi == NULL || ftdi->usb_dev == NULL)
943 ftdi_error_return(-3, "USB device unavailable");
945 result = ftdi_usb_purge_rx_buffer(ftdi);
949 result = ftdi_usb_purge_tx_buffer(ftdi);
959 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
961 \param ftdi pointer to ftdi_context
964 \retval -1: usb_release failed
965 \retval -2: usb_close failed
966 \retval -3: ftdi context invalid
968 int ftdi_usb_close(struct ftdi_context *ftdi)
973 ftdi_error_return(-3, "ftdi context invalid");
975 #ifdef LIBFTDI_LINUX_ASYNC_MODE
976 /* try to release some kernel resources */
977 ftdi_async_complete(ftdi,1);
980 if (ftdi->usb_dev != NULL)
981 if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0)
984 if (ftdi_usb_close_internal (ftdi) != 0)
991 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
992 Function is only used internally
995 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
996 unsigned short *value, unsigned short *index)
998 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
999 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
1000 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1001 int divisor, best_divisor, best_baud, best_baud_diff;
1002 unsigned long encoded_divisor;
1011 divisor = 24000000 / baudrate;
1013 if (ftdi->type == TYPE_AM)
1015 // Round down to supported fraction (AM only)
1016 divisor -= am_adjust_dn[divisor & 7];
1019 // Try this divisor and the one above it (because division rounds down)
1023 for (i = 0; i < 2; i++)
1025 int try_divisor = divisor + i;
1029 // Round up to supported divisor value
1030 if (try_divisor <= 8)
1032 // Round up to minimum supported divisor
1035 else if (ftdi->type != TYPE_AM && try_divisor < 12)
1037 // BM doesn't support divisors 9 through 11 inclusive
1040 else if (divisor < 16)
1042 // AM doesn't support divisors 9 through 15 inclusive
1047 if (ftdi->type == TYPE_AM)
1049 // Round up to supported fraction (AM only)
1050 try_divisor += am_adjust_up[try_divisor & 7];
1051 if (try_divisor > 0x1FFF8)
1053 // Round down to maximum supported divisor value (for AM)
1054 try_divisor = 0x1FFF8;
1059 if (try_divisor > 0x1FFFF)
1061 // Round down to maximum supported divisor value (for BM)
1062 try_divisor = 0x1FFFF;
1066 // Get estimated baud rate (to nearest integer)
1067 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1068 // Get absolute difference from requested baud rate
1069 if (baud_estimate < baudrate)
1071 baud_diff = baudrate - baud_estimate;
1075 baud_diff = baud_estimate - baudrate;
1077 if (i == 0 || baud_diff < best_baud_diff)
1079 // Closest to requested baud rate so far
1080 best_divisor = try_divisor;
1081 best_baud = baud_estimate;
1082 best_baud_diff = baud_diff;
1085 // Spot on! No point trying
1090 // Encode the best divisor value
1091 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1092 // Deal with special cases for encoded value
1093 if (encoded_divisor == 1)
1095 encoded_divisor = 0; // 3000000 baud
1097 else if (encoded_divisor == 0x4001)
1099 encoded_divisor = 1; // 2000000 baud (BM only)
1101 // Split into "value" and "index" values
1102 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1103 if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
1105 *index = (unsigned short)(encoded_divisor >> 8);
1107 *index |= ftdi->index;
1110 *index = (unsigned short)(encoded_divisor >> 16);
1112 // Return the nearest baud rate
1117 Sets the chip baud rate
1119 \param ftdi pointer to ftdi_context
1120 \param baudrate baud rate to set
1123 \retval -1: invalid baudrate
1124 \retval -2: setting baudrate failed
1125 \retval -3: USB device unavailable
1127 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1129 unsigned short value, index;
1130 int actual_baudrate;
1132 if (ftdi == NULL || ftdi->usb_dev == NULL)
1133 ftdi_error_return(-3, "USB device unavailable");
1135 if (ftdi->bitbang_enabled)
1137 baudrate = baudrate*4;
1140 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1141 if (actual_baudrate <= 0)
1142 ftdi_error_return (-1, "Silly baudrate <= 0.");
1144 // Check within tolerance (about 5%)
1145 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1146 || ((actual_baudrate < baudrate)
1147 ? (actual_baudrate * 21 < baudrate * 20)
1148 : (baudrate * 21 < actual_baudrate * 20)))
1149 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1151 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1152 SIO_SET_BAUDRATE_REQUEST, value,
1153 index, NULL, 0, ftdi->usb_write_timeout) != 0)
1154 ftdi_error_return (-2, "Setting new baudrate failed");
1156 ftdi->baudrate = baudrate;
1161 Set (RS232) line characteristics.
1162 The break type can only be set via ftdi_set_line_property2()
1163 and defaults to "off".
1165 \param ftdi pointer to ftdi_context
1166 \param bits Number of bits
1167 \param sbit Number of stop bits
1168 \param parity Parity mode
1171 \retval -1: Setting line property failed
1173 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1174 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1176 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1180 Set (RS232) line characteristics
1182 \param ftdi pointer to ftdi_context
1183 \param bits Number of bits
1184 \param sbit Number of stop bits
1185 \param parity Parity mode
1186 \param break_type Break type
1189 \retval -1: Setting line property failed
1190 \retval -2: USB device unavailable
1192 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1193 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1194 enum ftdi_break_type break_type)
1196 unsigned short value = bits;
1198 if (ftdi == NULL || ftdi->usb_dev == NULL)
1199 ftdi_error_return(-2, "USB device unavailable");
1204 value |= (0x00 << 8);
1207 value |= (0x01 << 8);
1210 value |= (0x02 << 8);
1213 value |= (0x03 << 8);
1216 value |= (0x04 << 8);
1223 value |= (0x00 << 11);
1226 value |= (0x01 << 11);
1229 value |= (0x02 << 11);
1236 value |= (0x00 << 14);
1239 value |= (0x01 << 14);
1243 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1244 SIO_SET_DATA_REQUEST, value,
1245 ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
1246 ftdi_error_return (-1, "Setting new line property failed");
1252 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1254 \param ftdi pointer to ftdi_context
1255 \param buf Buffer with the data
1256 \param size Size of the buffer
1258 \retval -666: USB device unavailable
1259 \retval <0: error code from usb_bulk_write()
1260 \retval >0: number of bytes written
1262 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1266 int total_written = 0;
1268 if (ftdi == NULL || ftdi->usb_dev == NULL)
1269 ftdi_error_return(-666, "USB device unavailable");
1271 while (offset < size)
1273 int write_size = ftdi->writebuffer_chunksize;
1275 if (offset+write_size > size)
1276 write_size = size-offset;
1278 ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout);
1280 ftdi_error_return(ret, "usb bulk write failed");
1282 total_written += ret;
1283 offset += write_size;
1286 return total_written;
1289 #ifdef LIBFTDI_LINUX_ASYNC_MODE
1290 #ifdef USB_CLASS_PTP
1291 #error LIBFTDI_LINUX_ASYNC_MODE is not compatible with libusb-compat-0.1!
1293 /* this is strongly dependent on libusb using the same struct layout. If libusb
1294 changes in some later version this may break horribly (this is for libusb 0.1.12) */
1295 struct usb_dev_handle
1298 // some other stuff coming here we don't need
1302 Check for pending async urbs
1305 static int _usb_get_async_urbs_pending(struct ftdi_context *ftdi)
1307 struct usbdevfs_urb *urb;
1311 for (i=0; i < ftdi->async_usb_buffer_size; i++)
1313 urb=&((struct usbdevfs_urb *)(ftdi->async_usb_buffer))[i];
1314 if (urb->usercontext != FTDI_URB_USERCONTEXT_COOKIE)
1322 Wait until one or more async URBs are completed by the kernel and mark their
1323 positions in the async-buffer as unused
1325 \param ftdi pointer to ftdi_context
1326 \param wait_for_more if != 0 wait for more than one write to complete
1327 \param timeout_msec max milliseconds to wait
1331 static void _usb_async_cleanup(struct ftdi_context *ftdi, int wait_for_more, int timeout_msec)
1334 struct usbdevfs_urb *urb;
1340 FD_SET(ftdi->usb_dev->fd, &writefds);
1342 /* init timeout only once, select writes time left after call */
1343 tv.tv_sec = timeout_msec / 1000;
1344 tv.tv_usec = (timeout_msec % 1000) * 1000;
1351 while (_usb_get_async_urbs_pending(ftdi)
1352 && (ret = ioctl(ftdi->usb_dev->fd, USBDEVFS_REAPURBNDELAY, &urb)) == -1
1355 if (keep_going && !wait_for_more)
1357 /* don't wait if repeating only for keep_going */
1362 /* wait for timeout msec or something written ready */
1363 select(ftdi->usb_dev->fd+1, NULL, &writefds, NULL, &tv);
1366 if (ret == 0 && urb != NULL)
1368 /* got a free urb, mark it */
1369 urb->usercontext = FTDI_URB_USERCONTEXT_COOKIE;
1371 /* try to get more urbs that are ready now, but don't wait anymore */
1376 /* no more urbs waiting */
1384 Wait until one or more async URBs are completed by the kernel and mark their
1385 positions in the async-buffer as unused.
1387 \param ftdi pointer to ftdi_context
1388 \param wait_for_more if != 0 wait for more than one write to complete (until write timeout)
1390 void ftdi_async_complete(struct ftdi_context *ftdi, int wait_for_more)
1392 _usb_async_cleanup(ftdi,wait_for_more,ftdi->usb_write_timeout);
1396 Stupid libusb does not offer async writes nor does it allow
1397 access to its fd - so we need some hacks here.
1400 static int _usb_bulk_write_async(struct ftdi_context *ftdi, int ep, char *bytes, int size)
1402 struct usbdevfs_urb *urb;
1403 int bytesdone = 0, requested;
1404 int ret, cleanup_count;
1409 /* find a free urb buffer we can use */
1412 for (cleanup_count=0; urb==NULL && cleanup_count <= 1; cleanup_count++)
1414 if (i==ftdi->async_usb_buffer_size)
1416 /* wait until some buffers are free */
1417 _usb_async_cleanup(ftdi,0,ftdi->usb_write_timeout);
1420 for (i=0; i < ftdi->async_usb_buffer_size; i++)
1422 urb=&((struct usbdevfs_urb *)(ftdi->async_usb_buffer))[i];
1423 if (urb->usercontext == FTDI_URB_USERCONTEXT_COOKIE)
1424 break; /* found a free urb position */
1429 /* no free urb position found */
1433 requested = size - bytesdone;
1434 if (requested > 4096)
1437 memset(urb,0,sizeof(urb));
1439 urb->type = USBDEVFS_URB_TYPE_BULK;
1442 urb->buffer = bytes + bytesdone;
1443 urb->buffer_length = requested;
1445 urb->actual_length = 0;
1446 urb->number_of_packets = 0;
1447 urb->usercontext = 0;
1451 ret = ioctl(ftdi->usb_dev->fd, USBDEVFS_SUBMITURB, urb);
1453 while (ret < 0 && errno == EINTR);
1455 return ret; /* the caller can read errno to get more info */
1457 bytesdone += requested;
1459 while (bytesdone < size);
1464 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip.
1465 Does not wait for completion of the transfer nor does it make sure that
1466 the transfer was successful.
1468 This function could be extended to use signals and callbacks to inform the
1469 caller of completion or error - but this is not done yet, volunteers welcome.
1471 Works around libusb and directly accesses functions only available on Linux.
1472 Only available if compiled with --with-async-mode.
1474 \param ftdi pointer to ftdi_context
1475 \param buf Buffer with the data
1476 \param size Size of the buffer
1478 \retval -666: USB device unavailable
1479 \retval <0: error code from usb_bulk_write()
1480 \retval >0: number of bytes written
1482 int ftdi_write_data_async(struct ftdi_context *ftdi, unsigned char *buf, int size)
1486 int total_written = 0;
1488 if (ftdi == NULL || ftdi->usb_dev == NULL)
1489 ftdi_error_return(-666, "USB device unavailable");
1491 while (offset < size)
1493 int write_size = ftdi->writebuffer_chunksize;
1495 if (offset+write_size > size)
1496 write_size = size-offset;
1498 ret = _usb_bulk_write_async(ftdi, ftdi->in_ep, buf+offset, write_size);
1500 ftdi_error_return(ret, "usb bulk write async failed");
1502 total_written += ret;
1503 offset += write_size;
1506 return total_written;
1508 #endif // LIBFTDI_LINUX_ASYNC_MODE
1511 Configure write buffer chunk size.
1514 \param ftdi pointer to ftdi_context
1515 \param chunksize Chunk size
1518 \retval -1: ftdi context invalid
1520 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1523 ftdi_error_return(-1, "ftdi context invalid");
1525 ftdi->writebuffer_chunksize = chunksize;
1530 Get write buffer chunk size.
1532 \param ftdi pointer to ftdi_context
1533 \param chunksize Pointer to store chunk size in
1536 \retval -1: ftdi context invalid
1538 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1541 ftdi_error_return(-1, "ftdi context invalid");
1543 *chunksize = ftdi->writebuffer_chunksize;
1548 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1550 Returns when at least one byte is available or when the latency timer has elapsed
1551 Automatically strips the two modem status bytes transfered during every read.
1553 \param ftdi pointer to ftdi_context
1554 \param buf Buffer to store data in
1555 \param size Size of the buffer
1557 \retval -666: USB device unavailable
1558 \retval <0: error code from usb_bulk_read()
1559 \retval 0: no data was available
1560 \retval >0: number of bytes read
1563 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1565 int offset = 0, ret = 1, i, num_of_chunks, chunk_remains;
1567 struct timeval tv_start, tv_current;
1569 if (ftdi == NULL || ftdi->usb_dev == NULL)
1570 ftdi_error_return(-666, "USB device unavailable");
1572 packet_size = ftdi->max_packet_size;
1573 // Packet size sanity check (avoid division by zero)
1574 if (packet_size == 0)
1575 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1577 // everything we want is still in the readbuffer?
1578 if (size <= ftdi->readbuffer_remaining)
1580 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1583 ftdi->readbuffer_remaining -= size;
1584 ftdi->readbuffer_offset += size;
1586 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1590 // something still in the readbuffer, but not enough to satisfy 'size'?
1591 if (ftdi->readbuffer_remaining != 0)
1593 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1596 offset += ftdi->readbuffer_remaining;
1598 // do the actual USB read
1599 gettimeofday(&tv_start,NULL);
1600 while (offset < size && ret > 0)
1602 ftdi->readbuffer_remaining = 0;
1603 ftdi->readbuffer_offset = 0;
1604 /* returns how much received */
1605 ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout);
1607 ftdi_error_return(ret, "usb bulk read failed");
1611 // skip FTDI status bytes.
1612 // Maybe stored in the future to enable modem use
1613 num_of_chunks = ret / packet_size;
1614 chunk_remains = ret % packet_size;
1615 //printf("ret = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", ret, num_of_chunks, chunk_remains, ftdi->readbuffer_offset);
1617 ftdi->readbuffer_offset += 2;
1620 if (ret > packet_size - 2)
1622 for (i = 1; i < num_of_chunks; i++)
1623 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1624 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1626 if (chunk_remains > 2)
1628 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1629 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1631 ret -= 2*num_of_chunks;
1634 ret -= 2*(num_of_chunks-1)+chunk_remains;
1636 // data still fits in buf?
1637 if (offset+ret <= size)
1639 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret);
1640 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1643 /* Did we read exactly the right amount of bytes? */
1645 //printf("read_data exact rem %d offset %d\n",
1646 //ftdi->readbuffer_remaining, offset);
1651 // only copy part of the data or size <= readbuffer_chunksize
1652 int part_size = size-offset;
1653 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1655 ftdi->readbuffer_offset += part_size;
1656 ftdi->readbuffer_remaining = ret-part_size;
1657 offset += part_size;
1659 /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n",
1660 part_size, size, offset, ret, ftdi->readbuffer_remaining); */
1665 gettimeofday(&tv_current,NULL);
1666 if(((tv_current.tv_sec - tv_start.tv_sec)*1000000+(tv_current.tv_usec - tv_start.tv_usec))
1667 > ftdi->usb_read_timeout)
1675 Configure read buffer chunk size.
1678 Automatically reallocates the buffer.
1680 \param ftdi pointer to ftdi_context
1681 \param chunksize Chunk size
1684 \retval -1: ftdi context invalid
1686 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1688 unsigned char *new_buf;
1691 ftdi_error_return(-1, "ftdi context invalid");
1693 // Invalidate all remaining data
1694 ftdi->readbuffer_offset = 0;
1695 ftdi->readbuffer_remaining = 0;
1697 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1698 ftdi_error_return(-1, "out of memory for readbuffer");
1700 ftdi->readbuffer = new_buf;
1701 ftdi->readbuffer_chunksize = chunksize;
1707 Get read buffer chunk size.
1709 \param ftdi pointer to ftdi_context
1710 \param chunksize Pointer to store chunk size in
1713 \retval -1: FTDI context invalid
1715 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1718 ftdi_error_return(-1, "FTDI context invalid");
1720 *chunksize = ftdi->readbuffer_chunksize;
1726 Enable bitbang mode.
1728 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1730 \param ftdi pointer to ftdi_context
1731 \param bitmask Bitmask to configure lines.
1732 HIGH/ON value configures a line as output.
1735 \retval -1: can't enable bitbang mode
1736 \retval -2: USB device unavailable
1738 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1740 unsigned short usb_val;
1742 if (ftdi == NULL || ftdi->usb_dev == NULL)
1743 ftdi_error_return(-2, "USB device unavailable");
1745 usb_val = bitmask; // low byte: bitmask
1746 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1747 usb_val |= (ftdi->bitbang_mode << 8);
1749 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1750 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1751 NULL, 0, ftdi->usb_write_timeout) != 0)
1752 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1754 ftdi->bitbang_enabled = 1;
1759 Disable bitbang mode.
1761 \param ftdi pointer to ftdi_context
1764 \retval -1: can't disable bitbang mode
1765 \retval -2: USB device unavailable
1767 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1769 if (ftdi == NULL || ftdi->usb_dev == NULL)
1770 ftdi_error_return(-2, "USB device unavailable");
1772 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_BITMODE_REQUEST, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
1773 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1775 ftdi->bitbang_enabled = 0;
1780 Enable/disable bitbang modes.
1782 \param ftdi pointer to ftdi_context
1783 \param bitmask Bitmask to configure lines.
1784 HIGH/ON value configures a line as output.
1785 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1788 \retval -1: can't enable bitbang mode
1789 \retval -2: USB device unavailable
1791 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1793 unsigned short usb_val;
1795 if (ftdi == NULL || ftdi->usb_dev == NULL)
1796 ftdi_error_return(-2, "USB device unavailable");
1798 usb_val = bitmask; // low byte: bitmask
1799 usb_val |= (mode << 8);
1800 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
1801 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps selected mode not supported on your chip?");
1803 ftdi->bitbang_mode = mode;
1804 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1809 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1811 \param ftdi pointer to ftdi_context
1812 \param pins Pointer to store pins into
1815 \retval -1: read pins failed
1816 \retval -2: USB device unavailable
1818 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1820 if (ftdi == NULL || ftdi->usb_dev == NULL)
1821 ftdi_error_return(-2, "USB device unavailable");
1823 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_PINS_REQUEST, 0, ftdi->index, (char *)pins, 1, ftdi->usb_read_timeout) != 1)
1824 ftdi_error_return(-1, "read pins failed");
1832 The FTDI chip keeps data in the internal buffer for a specific
1833 amount of time if the buffer is not full yet to decrease
1834 load on the usb bus.
1836 \param ftdi pointer to ftdi_context
1837 \param latency Value between 1 and 255
1840 \retval -1: latency out of range
1841 \retval -2: unable to set latency timer
1842 \retval -3: USB device unavailable
1844 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1846 unsigned short usb_val;
1849 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1851 if (ftdi == NULL || ftdi->usb_dev == NULL)
1852 ftdi_error_return(-3, "USB device unavailable");
1855 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_LATENCY_TIMER_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
1856 ftdi_error_return(-2, "unable to set latency timer");
1864 \param ftdi pointer to ftdi_context
1865 \param latency Pointer to store latency value in
1868 \retval -1: unable to get latency timer
1869 \retval -2: USB device unavailable
1871 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
1873 unsigned short usb_val;
1875 if (ftdi == NULL || ftdi->usb_dev == NULL)
1876 ftdi_error_return(-2, "USB device unavailable");
1878 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_GET_LATENCY_TIMER_REQUEST, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1)
1879 ftdi_error_return(-1, "reading latency timer failed");
1881 *latency = (unsigned char)usb_val;
1886 Poll modem status information
1888 This function allows the retrieve the two status bytes of the device.
1889 The device sends these bytes also as a header for each read access
1890 where they are discarded by ftdi_read_data(). The chip generates
1891 the two stripped status bytes in the absence of data every 40 ms.
1893 Layout of the first byte:
1894 - B0..B3 - must be 0
1895 - B4 Clear to send (CTS)
1898 - B5 Data set ready (DTS)
1901 - B6 Ring indicator (RI)
1904 - B7 Receive line signal detect (RLSD)
1908 Layout of the second byte:
1909 - B0 Data ready (DR)
1910 - B1 Overrun error (OE)
1911 - B2 Parity error (PE)
1912 - B3 Framing error (FE)
1913 - B4 Break interrupt (BI)
1914 - B5 Transmitter holding register (THRE)
1915 - B6 Transmitter empty (TEMT)
1916 - B7 Error in RCVR FIFO
1918 \param ftdi pointer to ftdi_context
1919 \param status Pointer to store status information in. Must be two bytes.
1922 \retval -1: unable to retrieve status information
1923 \retval -2: USB device unavailable
1925 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
1929 if (ftdi == NULL || ftdi->usb_dev == NULL)
1930 ftdi_error_return(-2, "USB device unavailable");
1932 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_POLL_MODEM_STATUS_REQUEST, 0, ftdi->index, usb_val, 2, ftdi->usb_read_timeout) != 2)
1933 ftdi_error_return(-1, "getting modem status failed");
1935 *status = (usb_val[1] << 8) | usb_val[0];
1941 Set flowcontrol for ftdi chip
1943 \param ftdi pointer to ftdi_context
1944 \param flowctrl flow control to use. should be
1945 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
1948 \retval -1: set flow control failed
1949 \retval -2: USB device unavailable
1951 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
1953 if (ftdi == NULL || ftdi->usb_dev == NULL)
1954 ftdi_error_return(-2, "USB device unavailable");
1956 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1957 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
1958 NULL, 0, ftdi->usb_write_timeout) != 0)
1959 ftdi_error_return(-1, "set flow control failed");
1967 \param ftdi pointer to ftdi_context
1968 \param state state to set line to (1 or 0)
1971 \retval -1: set dtr failed
1972 \retval -2: USB device unavailable
1974 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
1976 unsigned short usb_val;
1978 if (ftdi == NULL || ftdi->usb_dev == NULL)
1979 ftdi_error_return(-2, "USB device unavailable");
1982 usb_val = SIO_SET_DTR_HIGH;
1984 usb_val = SIO_SET_DTR_LOW;
1986 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1987 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
1988 NULL, 0, ftdi->usb_write_timeout) != 0)
1989 ftdi_error_return(-1, "set dtr failed");
1997 \param ftdi pointer to ftdi_context
1998 \param state state to set line to (1 or 0)
2001 \retval -1: set rts failed
2002 \retval -2: USB device unavailable
2004 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2006 unsigned short usb_val;
2008 if (ftdi == NULL || ftdi->usb_dev == NULL)
2009 ftdi_error_return(-2, "USB device unavailable");
2012 usb_val = SIO_SET_RTS_HIGH;
2014 usb_val = SIO_SET_RTS_LOW;
2016 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2017 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2018 NULL, 0, ftdi->usb_write_timeout) != 0)
2019 ftdi_error_return(-1, "set of rts failed");
2025 Set dtr and rts line in one pass
2027 \param ftdi pointer to ftdi_context
2028 \param dtr DTR state to set line to (1 or 0)
2029 \param rts RTS state to set line to (1 or 0)
2032 \retval -1: set dtr/rts failed
2033 \retval -2: USB device unavailable
2035 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2037 unsigned short usb_val;
2039 if (ftdi == NULL || ftdi->usb_dev == NULL)
2040 ftdi_error_return(-2, "USB device unavailable");
2043 usb_val = SIO_SET_DTR_HIGH;
2045 usb_val = SIO_SET_DTR_LOW;
2048 usb_val |= SIO_SET_RTS_HIGH;
2050 usb_val |= SIO_SET_RTS_LOW;
2052 if (usb_control_msg(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/dtr failed");
2061 Set the special event character
2063 \param ftdi pointer to ftdi_context
2064 \param eventch Event character
2065 \param enable 0 to disable the event character, non-zero otherwise
2068 \retval -1: unable to set event character
2069 \retval -2: USB device unavailable
2071 int ftdi_set_event_char(struct ftdi_context *ftdi,
2072 unsigned char eventch, unsigned char enable)
2074 unsigned short usb_val;
2076 if (ftdi == NULL || ftdi->usb_dev == NULL)
2077 ftdi_error_return(-2, "USB device unavailable");
2083 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_EVENT_CHAR_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
2084 ftdi_error_return(-1, "setting event character failed");
2092 \param ftdi pointer to ftdi_context
2093 \param errorch Error character
2094 \param enable 0 to disable the error character, non-zero otherwise
2097 \retval -1: unable to set error character
2098 \retval -2: USB device unavailable
2100 int ftdi_set_error_char(struct ftdi_context *ftdi,
2101 unsigned char errorch, unsigned char enable)
2103 unsigned short usb_val;
2105 if (ftdi == NULL || ftdi->usb_dev == NULL)
2106 ftdi_error_return(-2, "USB device unavailable");
2112 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_SET_ERROR_CHAR_REQUEST, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0)
2113 ftdi_error_return(-1, "setting error character failed");
2121 \param ftdi pointer to ftdi_context
2122 \param eeprom Pointer to ftdi_eeprom
2126 void ftdi_eeprom_setsize(struct ftdi_context *ftdi, struct ftdi_eeprom *eeprom, int size)
2131 ftdi->eeprom_size=size;
2136 Init eeprom with default values.
2138 \param eeprom Pointer to ftdi_eeprom
2140 void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom)
2147 eeprom->vendor_id = 0x0403;
2148 eeprom->product_id = 0x6001;
2150 eeprom->self_powered = 1;
2151 eeprom->remote_wakeup = 1;
2152 eeprom->chip_type = TYPE_BM;
2154 eeprom->in_is_isochronous = 0;
2155 eeprom->out_is_isochronous = 0;
2156 eeprom->suspend_pull_downs = 0;
2158 eeprom->use_serial = 0;
2159 eeprom->change_usb_version = 0;
2160 eeprom->usb_version = 0x0200;
2161 eeprom->max_power = 0;
2163 eeprom->manufacturer = NULL;
2164 eeprom->product = NULL;
2165 eeprom->serial = NULL;
2166 for (i=0; i < 5; i++)
2168 eeprom->cbus_function[i] = 0;
2170 eeprom->high_current = 0;
2173 eeprom->size = FTDI_DEFAULT_EEPROM_SIZE;
2177 Frees allocated memory in eeprom.
2179 \param eeprom Pointer to ftdi_eeprom
2181 void ftdi_eeprom_free(struct ftdi_eeprom *eeprom)
2186 if (eeprom->manufacturer != 0) {
2187 free(eeprom->manufacturer);
2188 eeprom->manufacturer = 0;
2190 if (eeprom->product != 0) {
2191 free(eeprom->product);
2192 eeprom->product = 0;
2194 if (eeprom->serial != 0) {
2195 free(eeprom->serial);
2201 Build binary output from ftdi_eeprom structure.
2202 Output is suitable for ftdi_write_eeprom().
2204 \note This function doesn't handle FT2232x devices. Only FT232x.
2205 \param eeprom Pointer to ftdi_eeprom
2206 \param output Buffer of 128 bytes to store eeprom image to
2208 \retval >0: free eeprom size
2209 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2210 \retval -2: Invalid eeprom pointer
2211 \retval -3: Invalid cbus function setting
2212 \retval -4: Chip doesn't support invert
2213 \retval -5: Chip doesn't support high current drive
2215 int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output)
2218 unsigned short checksum, value;
2219 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2221 const int cbus_max[5] = {13, 13, 13, 13, 9};
2226 if (eeprom->manufacturer != NULL)
2227 manufacturer_size = strlen(eeprom->manufacturer);
2228 if (eeprom->product != NULL)
2229 product_size = strlen(eeprom->product);
2230 if (eeprom->serial != NULL)
2231 serial_size = strlen(eeprom->serial);
2233 // highest allowed cbus value
2234 for (i = 0; i < 5; i++)
2236 if ((eeprom->cbus_function[i] > cbus_max[i]) ||
2237 (eeprom->cbus_function[i] && eeprom->chip_type != TYPE_R)) return -3;
2239 if (eeprom->chip_type != TYPE_R)
2241 if (eeprom->invert) return -4;
2242 if (eeprom->high_current) return -5;
2245 size_check = eeprom->size;
2246 size_check -= 28; // 28 are always in use (fixed)
2248 // Top half of a 256byte eeprom is used just for strings and checksum
2249 // it seems that the FTDI chip will not read these strings from the lower half
2250 // Each string starts with two bytes; offset and type (0x03 for string)
2251 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2252 if (eeprom->size>=256) size_check = 120;
2253 size_check -= manufacturer_size*2;
2254 size_check -= product_size*2;
2255 size_check -= serial_size*2;
2257 // eeprom size exceeded?
2262 memset (output, 0, eeprom->size);
2264 // Addr 00: High current IO
2265 output[0x00] = eeprom->high_current ? HIGH_CURRENT_DRIVE : 0;
2266 // Addr 01: IN endpoint size (for R type devices, different for FT2232)
2267 if (eeprom->chip_type == TYPE_R) {
2268 output[0x01] = 0x40;
2270 // Addr 02: Vendor ID
2271 output[0x02] = eeprom->vendor_id;
2272 output[0x03] = eeprom->vendor_id >> 8;
2274 // Addr 04: Product ID
2275 output[0x04] = eeprom->product_id;
2276 output[0x05] = eeprom->product_id >> 8;
2278 // Addr 06: Device release number (0400h for BM features)
2279 output[0x06] = 0x00;
2280 switch (eeprom->chip_type) {
2282 output[0x07] = 0x02;
2285 output[0x07] = 0x04;
2288 output[0x07] = 0x05;
2291 output[0x07] = 0x06;
2294 output[0x07] = 0x00;
2297 // Addr 08: Config descriptor
2299 // Bit 6: 1 if this device is self powered, 0 if bus powered
2300 // Bit 5: 1 if this device uses remote wakeup
2301 // Bit 4: 1 if this device is battery powered
2303 if (eeprom->self_powered == 1)
2305 if (eeprom->remote_wakeup == 1)
2309 // Addr 09: Max power consumption: max power = value * 2 mA
2310 output[0x09] = eeprom->max_power;
2312 // Addr 0A: Chip configuration
2313 // Bit 7: 0 - reserved
2314 // Bit 6: 0 - reserved
2315 // Bit 5: 0 - reserved
2316 // Bit 4: 1 - Change USB version
2317 // Bit 3: 1 - Use the serial number string
2318 // Bit 2: 1 - Enable suspend pull downs for lower power
2319 // Bit 1: 1 - Out EndPoint is Isochronous
2320 // Bit 0: 1 - In EndPoint is Isochronous
2323 if (eeprom->in_is_isochronous == 1)
2325 if (eeprom->out_is_isochronous == 1)
2327 if (eeprom->suspend_pull_downs == 1)
2329 if (eeprom->use_serial == 1)
2331 if (eeprom->change_usb_version == 1)
2335 // Addr 0B: Invert data lines
2336 output[0x0B] = eeprom->invert & 0xff;
2338 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2339 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2340 if (eeprom->change_usb_version == 1)
2342 output[0x0C] = eeprom->usb_version;
2343 output[0x0D] = eeprom->usb_version >> 8;
2347 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2348 // Addr 0F: Length of manufacturer string
2349 output[0x0F] = manufacturer_size*2 + 2;
2351 // Addr 10: Offset of the product string + 0x80, calculated later
2352 // Addr 11: Length of product string
2353 output[0x11] = product_size*2 + 2;
2355 // Addr 12: Offset of the serial string + 0x80, calculated later
2356 // Addr 13: Length of serial string
2357 output[0x13] = serial_size*2 + 2;
2359 // Addr 14: CBUS function: CBUS0, CBUS1
2360 // Addr 15: CBUS function: CBUS2, CBUS3
2361 // Addr 16: CBUS function: CBUS5
2362 output[0x14] = eeprom->cbus_function[0] | (eeprom->cbus_function[1] << 4);
2363 output[0x15] = eeprom->cbus_function[2] | (eeprom->cbus_function[3] << 4);
2364 output[0x16] = eeprom->cbus_function[4];
2368 // In images produced by FTDI's FT_Prog for FT232R strings start at 0x18
2369 // Space till 0x18 should be considered as reserved.
2370 if (eeprom->chip_type >= TYPE_R) {
2375 if (eeprom->size >= 256) i = 0x80;
2378 // Output manufacturer
2379 output[0x0E] = i | 0x80; // calculate offset
2380 output[i++] = manufacturer_size*2 + 2;
2381 output[i++] = 0x03; // type: string
2382 for (j = 0; j < manufacturer_size; j++)
2384 output[i] = eeprom->manufacturer[j], i++;
2385 output[i] = 0x00, i++;
2388 // Output product name
2389 output[0x10] = i | 0x80; // calculate offset
2390 output[i] = product_size*2 + 2, i++;
2391 output[i] = 0x03, i++;
2392 for (j = 0; j < product_size; j++)
2394 output[i] = eeprom->product[j], i++;
2395 output[i] = 0x00, i++;
2399 output[0x12] = i | 0x80; // calculate offset
2400 output[i] = serial_size*2 + 2, i++;
2401 output[i] = 0x03, i++;
2402 for (j = 0; j < serial_size; j++)
2404 output[i] = eeprom->serial[j], i++;
2405 output[i] = 0x00, i++;
2408 // calculate checksum
2411 for (i = 0; i < eeprom->size/2-1; i++)
2413 value = output[i*2];
2414 value += output[(i*2)+1] << 8;
2416 checksum = value^checksum;
2417 checksum = (checksum << 1) | (checksum >> 15);
2420 output[eeprom->size-2] = checksum;
2421 output[eeprom->size-1] = checksum >> 8;
2427 Decode binary EEPROM image into an ftdi_eeprom structure.
2429 \param eeprom Pointer to ftdi_eeprom which will be filled in.
2430 \param buf Buffer of \a size bytes of raw eeprom data
2431 \param size size size of eeprom data in bytes
2434 \retval -1: something went wrong
2436 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2437 FIXME: Strings are malloc'ed here and should be freed somewhere
2439 int ftdi_eeprom_decode(struct ftdi_eeprom *eeprom, unsigned char *buf, int size)
2442 unsigned short checksum, eeprom_checksum, value;
2443 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2445 int eeprom_size = 128;
2450 size_check = eeprom->size;
2451 size_check -= 28; // 28 are always in use (fixed)
2453 // Top half of a 256byte eeprom is used just for strings and checksum
2454 // it seems that the FTDI chip will not read these strings from the lower half
2455 // Each string starts with two bytes; offset and type (0x03 for string)
2456 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2457 if (eeprom->size>=256)size_check = 120;
2458 size_check -= manufacturer_size*2;
2459 size_check -= product_size*2;
2460 size_check -= serial_size*2;
2462 // eeprom size exceeded?
2467 // empty eeprom struct
2468 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2470 // Addr 00: High current IO
2471 eeprom->high_current = (buf[0x02] & HIGH_CURRENT_DRIVE);
2473 // Addr 02: Vendor ID
2474 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2476 // Addr 04: Product ID
2477 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2479 value = buf[0x06] + (buf[0x07]<<8);
2483 eeprom->chip_type = TYPE_R;
2486 eeprom->chip_type = TYPE_BM;
2489 eeprom->chip_type = TYPE_AM;
2491 default: // Unknown device
2492 eeprom->chip_type = 0;
2496 // Addr 08: Config descriptor
2498 // Bit 6: 1 if this device is self powered, 0 if bus powered
2499 // Bit 5: 1 if this device uses remote wakeup
2500 // Bit 4: 1 if this device is battery powered
2502 if (j&0x40) eeprom->self_powered = 1;
2503 if (j&0x20) eeprom->remote_wakeup = 1;
2505 // Addr 09: Max power consumption: max power = value * 2 mA
2506 eeprom->max_power = buf[0x09];
2508 // Addr 0A: Chip configuration
2509 // Bit 7: 0 - reserved
2510 // Bit 6: 0 - reserved
2511 // Bit 5: 0 - reserved
2512 // Bit 4: 1 - Change USB version
2513 // Bit 3: 1 - Use the serial number string
2514 // Bit 2: 1 - Enable suspend pull downs for lower power
2515 // Bit 1: 1 - Out EndPoint is Isochronous
2516 // Bit 0: 1 - In EndPoint is Isochronous
2519 if (j&0x01) eeprom->in_is_isochronous = 1;
2520 if (j&0x02) eeprom->out_is_isochronous = 1;
2521 if (j&0x04) eeprom->suspend_pull_downs = 1;
2522 if (j&0x08) eeprom->use_serial = 1;
2523 if (j&0x10) eeprom->change_usb_version = 1;
2525 // Addr 0B: Invert data lines
2526 eeprom->invert = buf[0x0B];
2528 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2529 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2530 if (eeprom->change_usb_version == 1)
2532 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2535 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2536 // Addr 0F: Length of manufacturer string
2537 manufacturer_size = buf[0x0F]/2;
2538 if (manufacturer_size > 0) eeprom->manufacturer = malloc(manufacturer_size);
2539 else eeprom->manufacturer = NULL;
2541 // Addr 10: Offset of the product string + 0x80, calculated later
2542 // Addr 11: Length of product string
2543 product_size = buf[0x11]/2;
2544 if (product_size > 0) eeprom->product = malloc(product_size);
2545 else eeprom->product = NULL;
2547 // Addr 12: Offset of the serial string + 0x80, calculated later
2548 // Addr 13: Length of serial string
2549 serial_size = buf[0x13]/2;
2550 if (serial_size > 0) eeprom->serial = malloc(serial_size);
2551 else eeprom->serial = NULL;
2553 // Addr 14: CBUS function: CBUS0, CBUS1
2554 // Addr 15: CBUS function: CBUS2, CBUS3
2555 // Addr 16: CBUS function: CBUS5
2556 if (eeprom->chip_type == TYPE_R) {
2557 eeprom->cbus_function[0] = buf[0x14] & 0x0f;
2558 eeprom->cbus_function[1] = (buf[0x14] >> 4) & 0x0f;
2559 eeprom->cbus_function[2] = buf[0x15] & 0x0f;
2560 eeprom->cbus_function[3] = (buf[0x15] >> 4) & 0x0f;
2561 eeprom->cbus_function[4] = buf[0x16] & 0x0f;
2563 for (j=0; j<5; j++) eeprom->cbus_function[j] = 0;
2566 // Decode manufacturer
2567 i = buf[0x0E] & 0x7f; // offset
2568 for (j=0;j<manufacturer_size-1;j++)
2570 eeprom->manufacturer[j] = buf[2*j+i+2];
2572 eeprom->manufacturer[j] = '\0';
2574 // Decode product name
2575 i = buf[0x10] & 0x7f; // offset
2576 for (j=0;j<product_size-1;j++)
2578 eeprom->product[j] = buf[2*j+i+2];
2580 eeprom->product[j] = '\0';
2583 i = buf[0x12] & 0x7f; // offset
2584 for (j=0;j<serial_size-1;j++)
2586 eeprom->serial[j] = buf[2*j+i+2];
2588 eeprom->serial[j] = '\0';
2593 for (i = 0; i < eeprom_size/2-1; i++)
2596 value += buf[(i*2)+1] << 8;
2598 checksum = value^checksum;
2599 checksum = (checksum << 1) | (checksum >> 15);
2602 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
2604 if (eeprom_checksum != checksum)
2606 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
2614 Read eeprom location
2616 \param ftdi pointer to ftdi_context
2617 \param eeprom_addr Address of eeprom location to be read
2618 \param eeprom_val Pointer to store read eeprom location
2621 \retval -1: read failed
2622 \retval -2: USB device unavailable
2624 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
2626 if (ftdi == NULL || ftdi->usb_dev == NULL)
2627 ftdi_error_return(-2, "USB device unavailable");
2629 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, eeprom_addr, (char *)eeprom_val, 2, ftdi->usb_read_timeout) != 2)
2630 ftdi_error_return(-1, "reading eeprom failed");
2638 \param ftdi pointer to ftdi_context
2639 \param eeprom Pointer to store eeprom into
2642 \retval -1: read failed
2643 \retval -2: USB device unavailable
2645 int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2649 if (ftdi == NULL || ftdi->usb_dev == NULL)
2650 ftdi_error_return(-2, "USB device unavailable");
2652 for (i = 0; i < ftdi->eeprom_size/2; i++)
2654 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2655 ftdi_error_return(-1, "reading eeprom failed");
2662 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
2663 Function is only used internally
2666 static unsigned char ftdi_read_chipid_shift(unsigned char value)
2668 return ((value & 1) << 1) |
2669 ((value & 2) << 5) |
2670 ((value & 4) >> 2) |
2671 ((value & 8) << 4) |
2672 ((value & 16) >> 1) |
2673 ((value & 32) >> 1) |
2674 ((value & 64) >> 4) |
2675 ((value & 128) >> 2);
2679 Read the FTDIChip-ID from R-type devices
2681 \param ftdi pointer to ftdi_context
2682 \param chipid Pointer to store FTDIChip-ID
2685 \retval -1: read failed
2686 \retval -2: USB device unavailable
2688 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
2690 unsigned int a = 0, b = 0;
2692 if (ftdi == NULL || ftdi->usb_dev == NULL)
2693 ftdi_error_return(-2, "USB device unavailable");
2695 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, 0x43, (char *)&a, 2, ftdi->usb_read_timeout) == 2)
2697 a = a << 8 | a >> 8;
2698 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, 0x44, (char *)&b, 2, ftdi->usb_read_timeout) == 2)
2700 b = b << 8 | b >> 8;
2701 a = (a << 16) | (b & 0xFFFF);
2702 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
2703 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
2704 *chipid = a ^ 0xa5f0f7d1;
2709 ftdi_error_return(-1, "read of FTDIChip-ID failed");
2713 Guesses size of eeprom by reading eeprom and comparing halves - will not work with blank eeprom
2714 Call this function then do a write then call again to see if size changes, if so write again.
2716 \param ftdi pointer to ftdi_context
2717 \param eeprom Pointer to store eeprom into
2718 \param maxsize the size of the buffer to read into
2720 \retval -1: eeprom read failed
2721 \retval -2: USB device unavailable
2722 \retval >=0: size of eeprom
2724 int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize)
2726 int i=0,j,minsize=32;
2729 if (ftdi == NULL || ftdi->usb_dev == NULL)
2730 ftdi_error_return(-2, "USB device unavailable");
2734 for (j = 0; i < maxsize/2 && j<size; j++)
2736 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,
2737 SIO_READ_EEPROM_REQUEST, 0, i,
2738 eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2739 ftdi_error_return(-1, "eeprom read failed");
2744 while (size<=maxsize && memcmp(eeprom,&eeprom[size/2],size/2)!=0);
2750 Write eeprom location
2752 \param ftdi pointer to ftdi_context
2753 \param eeprom_addr Address of eeprom location to be written
2754 \param eeprom_val Value to be written
2757 \retval -1: read failed
2758 \retval -2: USB device unavailable
2760 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr, unsigned short eeprom_val)
2762 if (ftdi == NULL || ftdi->usb_dev == NULL)
2763 ftdi_error_return(-2, "USB device unavailable");
2765 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2766 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
2767 NULL, 0, ftdi->usb_write_timeout) != 0)
2768 ftdi_error_return(-1, "unable to write eeprom");
2776 \param ftdi pointer to ftdi_context
2777 \param eeprom Pointer to read eeprom from
2780 \retval -1: read failed
2781 \retval -2: USB device unavailable
2783 int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2785 unsigned short usb_val, status;
2788 if (ftdi == NULL || ftdi->usb_dev == NULL)
2789 ftdi_error_return(-2, "USB device unavailable");
2791 /* These commands were traced while running MProg */
2792 if ((ret = ftdi_usb_reset(ftdi)) != 0)
2794 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
2796 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
2799 for (i = 0; i < ftdi->eeprom_size/2; i++)
2801 usb_val = eeprom[i*2];
2802 usb_val += eeprom[(i*2)+1] << 8;
2803 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2804 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
2805 NULL, 0, ftdi->usb_write_timeout) != 0)
2806 ftdi_error_return(-1, "unable to write eeprom");
2815 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
2817 \param ftdi pointer to ftdi_context
2820 \retval -1: erase failed
2821 \retval -2: USB device unavailable
2823 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
2825 if (ftdi == NULL || ftdi->usb_dev == NULL)
2826 ftdi_error_return(-2, "USB device unavailable");
2828 if (usb_control_msg(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0)
2829 ftdi_error_return(-1, "unable to erase eeprom");
2835 Get string representation for last error code
2837 \param ftdi pointer to ftdi_context
2839 \retval Pointer to error string
2841 char *ftdi_get_error_string (struct ftdi_context *ftdi)
2846 return ftdi->error_str;
2849 /* @} end of doxygen libftdi group */