1 /***************************************************************************
5 copyright : (C) 2003-2011 by Intra2net AG and the libftdi developers
6 email : opensource@intra2net.com
7 ***************************************************************************/
9 /***************************************************************************
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU Lesser General Public License *
13 * version 2.1 as published by the Free Software Foundation; *
15 ***************************************************************************/
18 \mainpage libftdi API documentation
20 Library to talk to FTDI chips. You find the latest versions of libftdi at
21 http://www.intra2net.com/en/developer/libftdi/
23 The library is easy to use. Have a look at this short example:
26 More examples can be found in the "examples" directory.
28 /** \addtogroup libftdi */
39 #define ftdi_error_return(code, str) do { \
40 ftdi->error_str = str; \
44 #define ftdi_error_return_free_device_list(code, str, devs) do { \
45 libusb_free_device_list(devs,1); \
46 ftdi->error_str = str; \
52 Internal function to close usb device pointer.
53 Sets ftdi->usb_dev to NULL.
56 \param ftdi pointer to ftdi_context
60 static void ftdi_usb_close_internal (struct ftdi_context *ftdi)
62 if (ftdi && ftdi->usb_dev)
64 libusb_close (ftdi->usb_dev);
67 ftdi->eeprom->initialized_for_connected_device = 0;
72 Initializes a ftdi_context.
74 \param ftdi pointer to ftdi_context
77 \retval -1: couldn't allocate read buffer
78 \retval -2: couldn't allocate struct buffer
79 \retval -3: libusb_init() failed
81 \remark This should be called before all functions
83 int ftdi_init(struct ftdi_context *ftdi)
85 struct ftdi_eeprom* eeprom = (struct ftdi_eeprom *)malloc(sizeof(struct ftdi_eeprom));
88 ftdi->usb_read_timeout = 5000;
89 ftdi->usb_write_timeout = 5000;
91 ftdi->type = TYPE_BM; /* chip type */
93 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
95 ftdi->readbuffer = NULL;
96 ftdi->readbuffer_offset = 0;
97 ftdi->readbuffer_remaining = 0;
98 ftdi->writebuffer_chunksize = 4096;
99 ftdi->max_packet_size = 0;
100 ftdi->error_str = NULL;
101 ftdi->module_detach_mode = AUTO_DETACH_SIO_MODULE;
103 if (libusb_init(&ftdi->usb_ctx) < 0)
104 ftdi_error_return(-3, "libusb_init() failed");
106 ftdi_set_interface(ftdi, INTERFACE_ANY);
107 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
110 ftdi_error_return(-2, "Can't malloc struct ftdi_eeprom");
111 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
112 ftdi->eeprom = eeprom;
114 /* All fine. Now allocate the readbuffer */
115 return ftdi_read_data_set_chunksize(ftdi, 4096);
119 Allocate and initialize a new ftdi_context
121 \return a pointer to a new ftdi_context, or NULL on failure
123 struct ftdi_context *ftdi_new(void)
125 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
132 if (ftdi_init(ftdi) != 0)
142 Open selected channels on a chip, otherwise use first channel.
144 \param ftdi pointer to ftdi_context
145 \param interface Interface to use for FT2232C/2232H/4232H chips.
148 \retval -1: unknown interface
149 \retval -2: USB device unavailable
151 int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
154 ftdi_error_return(-2, "USB device unavailable");
161 ftdi->index = INTERFACE_A;
167 ftdi->index = INTERFACE_B;
173 ftdi->index = INTERFACE_C;
179 ftdi->index = INTERFACE_D;
184 ftdi_error_return(-1, "Unknown interface");
190 Deinitializes a ftdi_context.
192 \param ftdi pointer to ftdi_context
194 void ftdi_deinit(struct ftdi_context *ftdi)
199 ftdi_usb_close_internal (ftdi);
201 if (ftdi->readbuffer != NULL)
203 free(ftdi->readbuffer);
204 ftdi->readbuffer = NULL;
207 if (ftdi->eeprom != NULL)
209 if (ftdi->eeprom->manufacturer != 0)
211 free(ftdi->eeprom->manufacturer);
212 ftdi->eeprom->manufacturer = 0;
214 if (ftdi->eeprom->product != 0)
216 free(ftdi->eeprom->product);
217 ftdi->eeprom->product = 0;
219 if (ftdi->eeprom->serial != 0)
221 free(ftdi->eeprom->serial);
222 ftdi->eeprom->serial = 0;
230 libusb_exit(ftdi->usb_ctx);
231 ftdi->usb_ctx = NULL;
236 Deinitialize and free an ftdi_context.
238 \param ftdi pointer to ftdi_context
240 void ftdi_free(struct ftdi_context *ftdi)
247 Use an already open libusb device.
249 \param ftdi pointer to ftdi_context
250 \param usb libusb libusb_device_handle to use
252 void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
262 Finds all ftdi devices with given VID:PID on the usb bus. Creates a new
263 ftdi_device_list which needs to be deallocated by ftdi_list_free() after
264 use. With VID:PID 0:0, search for the default devices
265 (0x403:0x6001, 0x403:0x6010, 0x403:0x6011, 0x403:0x6014)
267 \param ftdi pointer to ftdi_context
268 \param devlist Pointer where to store list of found devices
269 \param vendor Vendor ID to search for
270 \param product Product ID to search for
272 \retval >0: number of devices found
273 \retval -3: out of memory
274 \retval -5: libusb_get_device_list() failed
275 \retval -6: libusb_get_device_descriptor() failed
277 int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
279 struct ftdi_device_list **curdev;
281 libusb_device **devs;
285 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
286 ftdi_error_return(-5, "libusb_get_device_list() failed");
291 while ((dev = devs[i++]) != NULL)
293 struct libusb_device_descriptor desc;
295 if (libusb_get_device_descriptor(dev, &desc) < 0)
296 ftdi_error_return_free_device_list(-6, "libusb_get_device_descriptor() failed", devs);
298 if (((vendor != 0 && product != 0) &&
299 desc.idVendor == vendor && desc.idProduct == product) ||
300 ((vendor == 0 && product == 0) &&
301 (desc.idVendor == 0x403) && (desc.idProduct == 0x6001 || desc.idProduct == 0x6010
302 || desc.idProduct == 0x6011 || desc.idProduct == 0x6014)))
304 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
306 ftdi_error_return_free_device_list(-3, "out of memory", devs);
308 (*curdev)->next = NULL;
309 (*curdev)->dev = dev;
310 libusb_ref_device(dev);
311 curdev = &(*curdev)->next;
315 libusb_free_device_list(devs,1);
320 Frees a usb device list.
322 \param devlist USB device list created by ftdi_usb_find_all()
324 void ftdi_list_free(struct ftdi_device_list **devlist)
326 struct ftdi_device_list *curdev, *next;
328 for (curdev = *devlist; curdev != NULL;)
331 libusb_unref_device(curdev->dev);
340 Frees a usb device list.
342 \param devlist USB device list created by ftdi_usb_find_all()
344 void ftdi_list_free2(struct ftdi_device_list *devlist)
346 ftdi_list_free(&devlist);
350 Return device ID strings from the usb device.
352 The parameters manufacturer, description and serial may be NULL
353 or pointer to buffers to store the fetched strings.
355 \note Use this function only in combination with ftdi_usb_find_all()
356 as it closes the internal "usb_dev" after use.
358 \param ftdi pointer to ftdi_context
359 \param dev libusb usb_dev to use
360 \param manufacturer Store manufacturer string here if not NULL
361 \param mnf_len Buffer size of manufacturer string
362 \param description Store product description string here if not NULL
363 \param desc_len Buffer size of product description string
364 \param serial Store serial string here if not NULL
365 \param serial_len Buffer size of serial string
368 \retval -1: wrong arguments
369 \retval -4: unable to open device
370 \retval -7: get product manufacturer failed
371 \retval -8: get product description failed
372 \retval -9: get serial number failed
373 \retval -11: libusb_get_device_descriptor() failed
375 int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
376 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
378 struct libusb_device_descriptor desc;
380 if ((ftdi==NULL) || (dev==NULL))
383 if (libusb_open(dev, &ftdi->usb_dev) < 0)
384 ftdi_error_return(-4, "libusb_open() failed");
386 if (libusb_get_device_descriptor(dev, &desc) < 0)
387 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
389 if (manufacturer != NULL)
391 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
393 ftdi_usb_close_internal (ftdi);
394 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
398 if (description != NULL)
400 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
402 ftdi_usb_close_internal (ftdi);
403 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
409 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
411 ftdi_usb_close_internal (ftdi);
412 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
416 ftdi_usb_close_internal (ftdi);
422 * Internal function to determine the maximum packet size.
423 * \param ftdi pointer to ftdi_context
424 * \param dev libusb usb_dev to use
425 * \retval Maximum packet size for this device
427 static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
429 struct libusb_device_descriptor desc;
430 struct libusb_config_descriptor *config0;
431 unsigned int packet_size;
434 if (ftdi == NULL || dev == NULL)
437 // Determine maximum packet size. Init with default value.
438 // New hi-speed devices from FTDI use a packet size of 512 bytes
439 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
440 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H )
445 if (libusb_get_device_descriptor(dev, &desc) < 0)
448 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
451 if (desc.bNumConfigurations > 0)
453 if (ftdi->interface < config0->bNumInterfaces)
455 struct libusb_interface interface = config0->interface[ftdi->interface];
456 if (interface.num_altsetting > 0)
458 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
459 if (descriptor.bNumEndpoints > 0)
461 packet_size = descriptor.endpoint[0].wMaxPacketSize;
467 libusb_free_config_descriptor (config0);
472 Opens a ftdi device given by an usb_device.
474 \param ftdi pointer to ftdi_context
475 \param dev libusb usb_dev to use
478 \retval -3: unable to config device
479 \retval -4: unable to open device
480 \retval -5: unable to claim device
481 \retval -6: reset failed
482 \retval -7: set baudrate failed
483 \retval -8: ftdi context invalid
484 \retval -9: libusb_get_device_descriptor() failed
485 \retval -10: libusb_get_config_descriptor() failed
486 \retval -11: libusb_detach_kernel_driver() failed
487 \retval -12: libusb_get_configuration() failed
489 int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
491 struct libusb_device_descriptor desc;
492 struct libusb_config_descriptor *config0;
493 int cfg, cfg0, detach_errno = 0;
496 ftdi_error_return(-8, "ftdi context invalid");
498 if (libusb_open(dev, &ftdi->usb_dev) < 0)
499 ftdi_error_return(-4, "libusb_open() failed");
501 if (libusb_get_device_descriptor(dev, &desc) < 0)
502 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
504 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
505 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
506 cfg0 = config0->bConfigurationValue;
507 libusb_free_config_descriptor (config0);
509 // Try to detach ftdi_sio kernel module.
511 // The return code is kept in a separate variable and only parsed
512 // if usb_set_configuration() or usb_claim_interface() fails as the
513 // detach operation might be denied and everything still works fine.
514 // Likely scenario is a static ftdi_sio kernel module.
515 if (ftdi->module_detach_mode == AUTO_DETACH_SIO_MODULE)
517 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
518 detach_errno = errno;
521 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
522 ftdi_error_return(-12, "libusb_get_configuration () failed");
523 // set configuration (needed especially for windows)
524 // tolerate EBUSY: one device with one configuration, but two interfaces
525 // and libftdi sessions to both interfaces (e.g. FT2232)
526 if (desc.bNumConfigurations > 0 && cfg != cfg0)
528 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
530 ftdi_usb_close_internal (ftdi);
531 if (detach_errno == EPERM)
533 ftdi_error_return(-8, "inappropriate permissions on device!");
537 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
542 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
544 ftdi_usb_close_internal (ftdi);
545 if (detach_errno == EPERM)
547 ftdi_error_return(-8, "inappropriate permissions on device!");
551 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
555 if (ftdi_usb_reset (ftdi) != 0)
557 ftdi_usb_close_internal (ftdi);
558 ftdi_error_return(-6, "ftdi_usb_reset failed");
561 // Try to guess chip type
562 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
563 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
564 && desc.iSerialNumber == 0))
565 ftdi->type = TYPE_BM;
566 else if (desc.bcdDevice == 0x200)
567 ftdi->type = TYPE_AM;
568 else if (desc.bcdDevice == 0x500)
569 ftdi->type = TYPE_2232C;
570 else if (desc.bcdDevice == 0x600)
572 else if (desc.bcdDevice == 0x700)
573 ftdi->type = TYPE_2232H;
574 else if (desc.bcdDevice == 0x800)
575 ftdi->type = TYPE_4232H;
576 else if (desc.bcdDevice == 0x900)
577 ftdi->type = TYPE_232H;
579 // Determine maximum packet size
580 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
582 if (ftdi_set_baudrate (ftdi, 9600) != 0)
584 ftdi_usb_close_internal (ftdi);
585 ftdi_error_return(-7, "set baudrate failed");
588 ftdi_error_return(0, "all fine");
592 Opens the first device with a given vendor and product ids.
594 \param ftdi pointer to ftdi_context
595 \param vendor Vendor ID
596 \param product Product ID
598 \retval same as ftdi_usb_open_desc()
600 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
602 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
606 Opens the first device with a given, vendor id, product id,
607 description and serial.
609 \param ftdi pointer to ftdi_context
610 \param vendor Vendor ID
611 \param product Product ID
612 \param description Description to search for. Use NULL if not needed.
613 \param serial Serial to search for. Use NULL if not needed.
616 \retval -3: usb device not found
617 \retval -4: unable to open device
618 \retval -5: unable to claim device
619 \retval -6: reset failed
620 \retval -7: set baudrate failed
621 \retval -8: get product description failed
622 \retval -9: get serial number failed
623 \retval -12: libusb_get_device_list() failed
624 \retval -13: libusb_get_device_descriptor() failed
626 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
627 const char* description, const char* serial)
629 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
633 Opens the index-th device with a given, vendor id, product id,
634 description and serial.
636 \param ftdi pointer to ftdi_context
637 \param vendor Vendor ID
638 \param product Product ID
639 \param description Description to search for. Use NULL if not needed.
640 \param serial Serial to search for. Use NULL if not needed.
641 \param index Number of matching device to open if there are more than one, starts with 0.
644 \retval -1: usb_find_busses() failed
645 \retval -2: usb_find_devices() failed
646 \retval -3: usb device not found
647 \retval -4: unable to open device
648 \retval -5: unable to claim device
649 \retval -6: reset failed
650 \retval -7: set baudrate failed
651 \retval -8: get product description failed
652 \retval -9: get serial number failed
653 \retval -10: unable to close device
654 \retval -11: ftdi context invalid
656 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
657 const char* description, const char* serial, unsigned int index)
660 libusb_device **devs;
665 ftdi_error_return(-11, "ftdi context invalid");
667 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
668 ftdi_error_return(-12, "libusb_get_device_list() failed");
670 while ((dev = devs[i++]) != NULL)
672 struct libusb_device_descriptor desc;
675 if (libusb_get_device_descriptor(dev, &desc) < 0)
676 ftdi_error_return_free_device_list(-13, "libusb_get_device_descriptor() failed", devs);
678 if (desc.idVendor == vendor && desc.idProduct == product)
680 if (libusb_open(dev, &ftdi->usb_dev) < 0)
681 ftdi_error_return_free_device_list(-4, "usb_open() failed", devs);
683 if (description != NULL)
685 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
687 ftdi_usb_close_internal (ftdi);
688 ftdi_error_return_free_device_list(-8, "unable to fetch product description", devs);
690 if (strncmp(string, description, sizeof(string)) != 0)
692 ftdi_usb_close_internal (ftdi);
698 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
700 ftdi_usb_close_internal (ftdi);
701 ftdi_error_return_free_device_list(-9, "unable to fetch serial number", devs);
703 if (strncmp(string, serial, sizeof(string)) != 0)
705 ftdi_usb_close_internal (ftdi);
710 ftdi_usb_close_internal (ftdi);
718 res = ftdi_usb_open_dev(ftdi, dev);
719 libusb_free_device_list(devs,1);
725 ftdi_error_return_free_device_list(-3, "device not found", devs);
729 Opens the ftdi-device described by a description-string.
730 Intended to be used for parsing a device-description given as commandline argument.
732 \param ftdi pointer to ftdi_context
733 \param description NULL-terminated description-string, using this format:
734 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
735 \li <tt>i:\<vendor>:\<product></tt> first device with given vendor and product id, ids can be decimal, octal (preceded by "0") or hex (preceded by "0x")
736 \li <tt>i:\<vendor>:\<product>:\<index></tt> as above with index being the number of the device (starting with 0) if there are more than one
737 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
739 \note The description format may be extended in later versions.
742 \retval -2: libusb_get_device_list() failed
743 \retval -3: usb device not found
744 \retval -4: unable to open device
745 \retval -5: unable to claim device
746 \retval -6: reset failed
747 \retval -7: set baudrate failed
748 \retval -8: get product description failed
749 \retval -9: get serial number failed
750 \retval -10: unable to close device
751 \retval -11: illegal description format
752 \retval -12: ftdi context invalid
754 int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
757 ftdi_error_return(-12, "ftdi context invalid");
759 if (description[0] == 0 || description[1] != ':')
760 ftdi_error_return(-11, "illegal description format");
762 if (description[0] == 'd')
765 libusb_device **devs;
766 unsigned int bus_number, device_address;
769 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
770 ftdi_error_return(-2, "libusb_get_device_list() failed");
772 /* XXX: This doesn't handle symlinks/odd paths/etc... */
773 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
774 ftdi_error_return_free_device_list(-11, "illegal description format", devs);
776 while ((dev = devs[i++]) != NULL)
779 if (bus_number == libusb_get_bus_number (dev)
780 && device_address == libusb_get_device_address (dev))
782 ret = ftdi_usb_open_dev(ftdi, dev);
783 libusb_free_device_list(devs,1);
789 ftdi_error_return_free_device_list(-3, "device not found", devs);
791 else if (description[0] == 'i' || description[0] == 's')
794 unsigned int product;
795 unsigned int index=0;
796 const char *serial=NULL;
797 const char *startp, *endp;
800 startp=description+2;
801 vendor=strtoul((char*)startp,(char**)&endp,0);
802 if (*endp != ':' || endp == startp || errno != 0)
803 ftdi_error_return(-11, "illegal description format");
806 product=strtoul((char*)startp,(char**)&endp,0);
807 if (endp == startp || errno != 0)
808 ftdi_error_return(-11, "illegal description format");
810 if (description[0] == 'i' && *endp != 0)
812 /* optional index field in i-mode */
814 ftdi_error_return(-11, "illegal description format");
817 index=strtoul((char*)startp,(char**)&endp,0);
818 if (*endp != 0 || endp == startp || errno != 0)
819 ftdi_error_return(-11, "illegal description format");
821 if (description[0] == 's')
824 ftdi_error_return(-11, "illegal description format");
826 /* rest of the description is the serial */
830 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
834 ftdi_error_return(-11, "illegal description format");
839 Resets the ftdi device.
841 \param ftdi pointer to ftdi_context
844 \retval -1: FTDI reset failed
845 \retval -2: USB device unavailable
847 int ftdi_usb_reset(struct ftdi_context *ftdi)
849 if (ftdi == NULL || ftdi->usb_dev == NULL)
850 ftdi_error_return(-2, "USB device unavailable");
852 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
853 SIO_RESET_REQUEST, SIO_RESET_SIO,
854 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
855 ftdi_error_return(-1,"FTDI reset failed");
857 // Invalidate data in the readbuffer
858 ftdi->readbuffer_offset = 0;
859 ftdi->readbuffer_remaining = 0;
865 Clears the read buffer on the chip and the internal read buffer.
867 \param ftdi pointer to ftdi_context
870 \retval -1: read buffer purge failed
871 \retval -2: USB device unavailable
873 int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
875 if (ftdi == NULL || ftdi->usb_dev == NULL)
876 ftdi_error_return(-2, "USB device unavailable");
878 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
879 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
880 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
881 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
883 // Invalidate data in the readbuffer
884 ftdi->readbuffer_offset = 0;
885 ftdi->readbuffer_remaining = 0;
891 Clears the write buffer on the chip.
893 \param ftdi pointer to ftdi_context
896 \retval -1: write buffer purge failed
897 \retval -2: USB device unavailable
899 int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
901 if (ftdi == NULL || ftdi->usb_dev == NULL)
902 ftdi_error_return(-2, "USB device unavailable");
904 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
905 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
906 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
907 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
913 Clears the buffers on the chip and the internal read buffer.
915 \param ftdi pointer to ftdi_context
918 \retval -1: read buffer purge failed
919 \retval -2: write buffer purge failed
920 \retval -3: USB device unavailable
922 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
926 if (ftdi == NULL || ftdi->usb_dev == NULL)
927 ftdi_error_return(-3, "USB device unavailable");
929 result = ftdi_usb_purge_rx_buffer(ftdi);
933 result = ftdi_usb_purge_tx_buffer(ftdi);
943 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
945 \param ftdi pointer to ftdi_context
948 \retval -1: usb_release failed
949 \retval -3: ftdi context invalid
951 int ftdi_usb_close(struct ftdi_context *ftdi)
956 ftdi_error_return(-3, "ftdi context invalid");
958 if (ftdi->usb_dev != NULL)
959 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
962 ftdi_usb_close_internal (ftdi);
967 /* ftdi_to_clkbits_AM For the AM device, convert a requested baudrate
968 to encoded divisor and the achievable baudrate
969 Function is only used internally
976 From /2, 0.125/ 0.25 and 0.5 steps may be taken
977 The fractional part has frac_code encoding
979 static int ftdi_to_clkbits_AM(int baudrate, unsigned long *encoded_divisor)
982 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
983 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
984 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
985 int divisor, best_divisor, best_baud, best_baud_diff;
986 divisor = 24000000 / baudrate;
989 // Round down to supported fraction (AM only)
990 divisor -= am_adjust_dn[divisor & 7];
992 // Try this divisor and the one above it (because division rounds down)
996 for (i = 0; i < 2; i++)
998 int try_divisor = divisor + i;
1002 // Round up to supported divisor value
1003 if (try_divisor <= 8)
1005 // Round up to minimum supported divisor
1008 else if (divisor < 16)
1010 // AM doesn't support divisors 9 through 15 inclusive
1015 // Round up to supported fraction (AM only)
1016 try_divisor += am_adjust_up[try_divisor & 7];
1017 if (try_divisor > 0x1FFF8)
1019 // Round down to maximum supported divisor value (for AM)
1020 try_divisor = 0x1FFF8;
1023 // Get estimated baud rate (to nearest integer)
1024 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1025 // Get absolute difference from requested baud rate
1026 if (baud_estimate < baudrate)
1028 baud_diff = baudrate - baud_estimate;
1032 baud_diff = baud_estimate - baudrate;
1034 if (i == 0 || baud_diff < best_baud_diff)
1036 // Closest to requested baud rate so far
1037 best_divisor = try_divisor;
1038 best_baud = baud_estimate;
1039 best_baud_diff = baud_diff;
1042 // Spot on! No point trying
1047 // Encode the best divisor value
1048 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1049 // Deal with special cases for encoded value
1050 if (*encoded_divisor == 1)
1052 *encoded_divisor = 0; // 3000000 baud
1054 else if (*encoded_divisor == 0x4001)
1056 *encoded_divisor = 1; // 2000000 baud (BM only)
1061 /* ftdi_to_clkbits Convert a requested baudrate for a given system clock and predivisor
1062 to encoded divisor and the achievable baudrate
1063 Function is only used internally
1070 From /2, 0.125 steps may be taken.
1071 The fractional part has frac_code encoding
1073 static int ftdi_to_clkbits(int baudrate, unsigned int clk, int clk_div, unsigned long *encoded_divisor)
1075 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
1077 int divisor, best_divisor;
1078 if (baudrate >= clk/clk_div)
1080 *encoded_divisor = 0;
1081 best_baud = clk/clk_div;
1083 else if (baudrate >= clk/(clk_div + clk_div/2))
1085 *encoded_divisor = 1;
1086 best_baud = clk/(clk_div + clk_div/2);
1088 else if (baudrate >= clk/(2*clk_div))
1090 *encoded_divisor = 2;
1091 best_baud = clk/(2*clk_div);
1095 /* We divide by 16 to have 3 fractional bits and one bit for rounding */
1096 divisor = clk*16/clk_div / baudrate;
1097 if (divisor & 1) /* Decide if to round up or down*/
1098 best_divisor = divisor /2 +1;
1100 best_divisor = divisor/2;
1101 if(best_divisor > 0x20000)
1102 best_divisor = 0x1ffff;
1103 best_baud = clk*8/clk_div/best_divisor;
1104 *encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 0x7] << 14);
1109 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
1110 Function is only used internally
1113 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
1114 unsigned short *value, unsigned short *index)
1117 unsigned long encoded_divisor;
1125 #define H_CLK 120000000
1126 #define C_CLK 48000000
1127 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H) || (ftdi->type == TYPE_232H ))
1129 if(baudrate*10 > H_CLK /0x3fff)
1131 /* On H Devices, use 12 000 000 Baudrate when possible
1132 We have a 14 bit divisor, a 1 bit divisor switch (10 or 16)
1133 three fractional bits and a 120 MHz clock
1134 Assume AN_120 "Sub-integer divisors between 0 and 2 are not allowed" holds for
1135 DIV/10 CLK too, so /1, /1.5 and /2 can be handled the same*/
1136 best_baud = ftdi_to_clkbits(baudrate, H_CLK, 10, &encoded_divisor);
1137 encoded_divisor |= 0x20000; /* switch on CLK/10*/
1140 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1142 else if ((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C) || (ftdi->type == TYPE_R ))
1144 best_baud = ftdi_to_clkbits(baudrate, C_CLK, 16, &encoded_divisor);
1148 best_baud = ftdi_to_clkbits_AM(baudrate, &encoded_divisor);
1150 // Split into "value" and "index" values
1151 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1152 if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H ||
1153 ftdi->type == TYPE_4232H || ftdi->type == TYPE_232H )
1155 *index = (unsigned short)(encoded_divisor >> 8);
1157 *index |= ftdi->index;
1160 *index = (unsigned short)(encoded_divisor >> 16);
1162 // Return the nearest baud rate
1167 * @brief Wrapper function to export ftdi_convert_baudrate() to the unit test
1168 * Do not use, it's only for the unit test framework
1170 int convert_baudrate_UT_export(int baudrate, struct ftdi_context *ftdi,
1171 unsigned short *value, unsigned short *index)
1173 return ftdi_convert_baudrate(baudrate, ftdi, value, index);
1177 Sets the chip baud rate
1179 \param ftdi pointer to ftdi_context
1180 \param baudrate baud rate to set
1183 \retval -1: invalid baudrate
1184 \retval -2: setting baudrate failed
1185 \retval -3: USB device unavailable
1187 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1189 unsigned short value, index;
1190 int actual_baudrate;
1192 if (ftdi == NULL || ftdi->usb_dev == NULL)
1193 ftdi_error_return(-3, "USB device unavailable");
1195 if (ftdi->bitbang_enabled)
1197 baudrate = baudrate*4;
1200 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1201 if (actual_baudrate <= 0)
1202 ftdi_error_return (-1, "Silly baudrate <= 0.");
1204 // Check within tolerance (about 5%)
1205 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1206 || ((actual_baudrate < baudrate)
1207 ? (actual_baudrate * 21 < baudrate * 20)
1208 : (baudrate * 21 < actual_baudrate * 20)))
1209 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1211 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1212 SIO_SET_BAUDRATE_REQUEST, value,
1213 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1214 ftdi_error_return (-2, "Setting new baudrate failed");
1216 ftdi->baudrate = baudrate;
1221 Set (RS232) line characteristics.
1222 The break type can only be set via ftdi_set_line_property2()
1223 and defaults to "off".
1225 \param ftdi pointer to ftdi_context
1226 \param bits Number of bits
1227 \param sbit Number of stop bits
1228 \param parity Parity mode
1231 \retval -1: Setting line property failed
1233 int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1234 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1236 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1240 Set (RS232) line characteristics
1242 \param ftdi pointer to ftdi_context
1243 \param bits Number of bits
1244 \param sbit Number of stop bits
1245 \param parity Parity mode
1246 \param break_type Break type
1249 \retval -1: Setting line property failed
1250 \retval -2: USB device unavailable
1252 int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1253 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1254 enum ftdi_break_type break_type)
1256 unsigned short value = bits;
1258 if (ftdi == NULL || ftdi->usb_dev == NULL)
1259 ftdi_error_return(-2, "USB device unavailable");
1264 value |= (0x00 << 8);
1267 value |= (0x01 << 8);
1270 value |= (0x02 << 8);
1273 value |= (0x03 << 8);
1276 value |= (0x04 << 8);
1283 value |= (0x00 << 11);
1286 value |= (0x01 << 11);
1289 value |= (0x02 << 11);
1296 value |= (0x00 << 14);
1299 value |= (0x01 << 14);
1303 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1304 SIO_SET_DATA_REQUEST, value,
1305 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1306 ftdi_error_return (-1, "Setting new line property failed");
1312 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1314 \param ftdi pointer to ftdi_context
1315 \param buf Buffer with the data
1316 \param size Size of the buffer
1318 \retval -666: USB device unavailable
1319 \retval <0: error code from usb_bulk_write()
1320 \retval >0: number of bytes written
1322 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1327 if (ftdi == NULL || ftdi->usb_dev == NULL)
1328 ftdi_error_return(-666, "USB device unavailable");
1330 while (offset < size)
1332 int write_size = ftdi->writebuffer_chunksize;
1334 if (offset+write_size > size)
1335 write_size = size-offset;
1337 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1338 ftdi_error_return(-1, "usb bulk write failed");
1340 offset += actual_length;
1346 static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1348 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1349 struct ftdi_context *ftdi = tc->ftdi;
1350 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1352 packet_size = ftdi->max_packet_size;
1354 actual_length = transfer->actual_length;
1356 if (actual_length > 2)
1358 // skip FTDI status bytes.
1359 // Maybe stored in the future to enable modem use
1360 num_of_chunks = actual_length / packet_size;
1361 chunk_remains = actual_length % packet_size;
1362 //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);
1364 ftdi->readbuffer_offset += 2;
1367 if (actual_length > packet_size - 2)
1369 for (i = 1; i < num_of_chunks; i++)
1370 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1371 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1373 if (chunk_remains > 2)
1375 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1376 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1378 actual_length -= 2*num_of_chunks;
1381 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1384 if (actual_length > 0)
1386 // data still fits in buf?
1387 if (tc->offset + actual_length <= tc->size)
1389 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1390 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1391 tc->offset += actual_length;
1393 ftdi->readbuffer_offset = 0;
1394 ftdi->readbuffer_remaining = 0;
1396 /* Did we read exactly the right amount of bytes? */
1397 if (tc->offset == tc->size)
1399 //printf("read_data exact rem %d offset %d\n",
1400 //ftdi->readbuffer_remaining, offset);
1407 // only copy part of the data or size <= readbuffer_chunksize
1408 int part_size = tc->size - tc->offset;
1409 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1410 tc->offset += part_size;
1412 ftdi->readbuffer_offset += part_size;
1413 ftdi->readbuffer_remaining = actual_length - part_size;
1415 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1416 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1422 ret = libusb_submit_transfer (transfer);
1428 static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1430 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1431 struct ftdi_context *ftdi = tc->ftdi;
1433 tc->offset += transfer->actual_length;
1435 if (tc->offset == tc->size)
1441 int write_size = ftdi->writebuffer_chunksize;
1444 if (tc->offset + write_size > tc->size)
1445 write_size = tc->size - tc->offset;
1447 transfer->length = write_size;
1448 transfer->buffer = tc->buf + tc->offset;
1449 ret = libusb_submit_transfer (transfer);
1457 Writes data to the chip. Does not wait for completion of the transfer
1458 nor does it make sure that the transfer was successful.
1460 Use libusb 1.0 asynchronous API.
1462 \param ftdi pointer to ftdi_context
1463 \param buf Buffer with the data
1464 \param size Size of the buffer
1466 \retval NULL: Some error happens when submit transfer
1467 \retval !NULL: Pointer to a ftdi_transfer_control
1470 struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1472 struct ftdi_transfer_control *tc;
1473 struct libusb_transfer *transfer;
1474 int write_size, ret;
1476 if (ftdi == NULL || ftdi->usb_dev == NULL)
1479 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1483 transfer = libusb_alloc_transfer(0);
1496 if (size < ftdi->writebuffer_chunksize)
1499 write_size = ftdi->writebuffer_chunksize;
1501 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf,
1502 write_size, ftdi_write_data_cb, tc,
1503 ftdi->usb_write_timeout);
1504 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1506 ret = libusb_submit_transfer(transfer);
1509 libusb_free_transfer(transfer);
1513 tc->transfer = transfer;
1519 Reads data from the chip. Does not wait for completion of the transfer
1520 nor does it make sure that the transfer was successful.
1522 Use libusb 1.0 asynchronous API.
1524 \param ftdi pointer to ftdi_context
1525 \param buf Buffer with the data
1526 \param size Size of the buffer
1528 \retval NULL: Some error happens when submit transfer
1529 \retval !NULL: Pointer to a ftdi_transfer_control
1532 struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1534 struct ftdi_transfer_control *tc;
1535 struct libusb_transfer *transfer;
1538 if (ftdi == NULL || ftdi->usb_dev == NULL)
1541 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1549 if (size <= ftdi->readbuffer_remaining)
1551 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1554 ftdi->readbuffer_remaining -= size;
1555 ftdi->readbuffer_offset += size;
1557 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1561 tc->transfer = NULL;
1566 if (ftdi->readbuffer_remaining != 0)
1568 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1570 tc->offset = ftdi->readbuffer_remaining;
1575 transfer = libusb_alloc_transfer(0);
1582 ftdi->readbuffer_remaining = 0;
1583 ftdi->readbuffer_offset = 0;
1585 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);
1586 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1588 ret = libusb_submit_transfer(transfer);
1591 libusb_free_transfer(transfer);
1595 tc->transfer = transfer;
1601 Wait for completion of the transfer.
1603 Use libusb 1.0 asynchronous API.
1605 \param tc pointer to ftdi_transfer_control
1607 \retval < 0: Some error happens
1608 \retval >= 0: Data size transferred
1611 int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1615 while (!tc->completed)
1617 ret = libusb_handle_events(tc->ftdi->usb_ctx);
1620 if (ret == LIBUSB_ERROR_INTERRUPTED)
1622 libusb_cancel_transfer(tc->transfer);
1623 while (!tc->completed)
1624 if (libusb_handle_events(tc->ftdi->usb_ctx) < 0)
1626 libusb_free_transfer(tc->transfer);
1634 * tc->transfer could be NULL if "(size <= ftdi->readbuffer_remaining)"
1635 * at ftdi_read_data_submit(). Therefore, we need to check it here.
1639 if (tc->transfer->status != LIBUSB_TRANSFER_COMPLETED)
1641 libusb_free_transfer(tc->transfer);
1648 Configure write buffer chunk size.
1651 \param ftdi pointer to ftdi_context
1652 \param chunksize Chunk size
1655 \retval -1: ftdi context invalid
1657 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1660 ftdi_error_return(-1, "ftdi context invalid");
1662 ftdi->writebuffer_chunksize = chunksize;
1667 Get write buffer chunk size.
1669 \param ftdi pointer to ftdi_context
1670 \param chunksize Pointer to store chunk size in
1673 \retval -1: ftdi context invalid
1675 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1678 ftdi_error_return(-1, "ftdi context invalid");
1680 *chunksize = ftdi->writebuffer_chunksize;
1685 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1687 Automatically strips the two modem status bytes transfered during every read.
1689 \param ftdi pointer to ftdi_context
1690 \param buf Buffer to store data in
1691 \param size Size of the buffer
1693 \retval -666: USB device unavailable
1694 \retval <0: error code from libusb_bulk_transfer()
1695 \retval 0: no data was available
1696 \retval >0: number of bytes read
1699 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1701 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1702 int packet_size = ftdi->max_packet_size;
1703 int actual_length = 1;
1705 if (ftdi == NULL || ftdi->usb_dev == NULL)
1706 ftdi_error_return(-666, "USB device unavailable");
1708 // Packet size sanity check (avoid division by zero)
1709 if (packet_size == 0)
1710 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1712 // everything we want is still in the readbuffer?
1713 if (size <= ftdi->readbuffer_remaining)
1715 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1718 ftdi->readbuffer_remaining -= size;
1719 ftdi->readbuffer_offset += size;
1721 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1725 // something still in the readbuffer, but not enough to satisfy 'size'?
1726 if (ftdi->readbuffer_remaining != 0)
1728 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1731 offset += ftdi->readbuffer_remaining;
1733 // do the actual USB read
1734 while (offset < size && actual_length > 0)
1736 ftdi->readbuffer_remaining = 0;
1737 ftdi->readbuffer_offset = 0;
1738 /* returns how much received */
1739 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1741 ftdi_error_return(ret, "usb bulk read failed");
1743 if (actual_length > 2)
1745 // skip FTDI status bytes.
1746 // Maybe stored in the future to enable modem use
1747 num_of_chunks = actual_length / packet_size;
1748 chunk_remains = actual_length % packet_size;
1749 //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);
1751 ftdi->readbuffer_offset += 2;
1754 if (actual_length > packet_size - 2)
1756 for (i = 1; i < num_of_chunks; i++)
1757 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1758 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1760 if (chunk_remains > 2)
1762 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1763 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1765 actual_length -= 2*num_of_chunks;
1768 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1771 else if (actual_length <= 2)
1773 // no more data to read?
1776 if (actual_length > 0)
1778 // data still fits in buf?
1779 if (offset+actual_length <= size)
1781 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1782 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1783 offset += actual_length;
1785 /* Did we read exactly the right amount of bytes? */
1787 //printf("read_data exact rem %d offset %d\n",
1788 //ftdi->readbuffer_remaining, offset);
1793 // only copy part of the data or size <= readbuffer_chunksize
1794 int part_size = size-offset;
1795 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1797 ftdi->readbuffer_offset += part_size;
1798 ftdi->readbuffer_remaining = actual_length-part_size;
1799 offset += part_size;
1801 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1802 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1813 Configure read buffer chunk size.
1816 Automatically reallocates the buffer.
1818 \param ftdi pointer to ftdi_context
1819 \param chunksize Chunk size
1822 \retval -1: ftdi context invalid
1824 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1826 unsigned char *new_buf;
1829 ftdi_error_return(-1, "ftdi context invalid");
1831 // Invalidate all remaining data
1832 ftdi->readbuffer_offset = 0;
1833 ftdi->readbuffer_remaining = 0;
1835 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1836 which is defined in libusb-1.0. Otherwise, each USB read request will
1837 be divided into multiple URBs. This will cause issues on Linux kernel
1838 older than 2.6.32. */
1839 if (chunksize > 16384)
1843 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1844 ftdi_error_return(-1, "out of memory for readbuffer");
1846 ftdi->readbuffer = new_buf;
1847 ftdi->readbuffer_chunksize = chunksize;
1853 Get read buffer chunk size.
1855 \param ftdi pointer to ftdi_context
1856 \param chunksize Pointer to store chunk size in
1859 \retval -1: FTDI context invalid
1861 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1864 ftdi_error_return(-1, "FTDI context invalid");
1866 *chunksize = ftdi->readbuffer_chunksize;
1872 Enable bitbang mode.
1874 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1876 \param ftdi pointer to ftdi_context
1877 \param bitmask Bitmask to configure lines.
1878 HIGH/ON value configures a line as output.
1881 \retval -1: can't enable bitbang mode
1882 \retval -2: USB device unavailable
1884 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1886 unsigned short usb_val;
1888 if (ftdi == NULL || ftdi->usb_dev == NULL)
1889 ftdi_error_return(-2, "USB device unavailable");
1891 usb_val = bitmask; // low byte: bitmask
1892 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1893 usb_val |= (ftdi->bitbang_mode << 8);
1895 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1896 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1897 NULL, 0, ftdi->usb_write_timeout) < 0)
1898 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1900 ftdi->bitbang_enabled = 1;
1905 Disable bitbang mode.
1907 \param ftdi pointer to ftdi_context
1910 \retval -1: can't disable bitbang mode
1911 \retval -2: USB device unavailable
1913 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1915 if (ftdi == NULL || ftdi->usb_dev == NULL)
1916 ftdi_error_return(-2, "USB device unavailable");
1918 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)
1919 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1921 ftdi->bitbang_enabled = 0;
1926 Enable/disable bitbang modes.
1928 \param ftdi pointer to ftdi_context
1929 \param bitmask Bitmask to configure lines.
1930 HIGH/ON value configures a line as output.
1931 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1934 \retval -1: can't enable bitbang mode
1935 \retval -2: USB device unavailable
1937 int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1939 unsigned short usb_val;
1941 if (ftdi == NULL || ftdi->usb_dev == NULL)
1942 ftdi_error_return(-2, "USB device unavailable");
1944 usb_val = bitmask; // low byte: bitmask
1945 usb_val |= (mode << 8);
1946 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)
1947 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?");
1949 ftdi->bitbang_mode = mode;
1950 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1955 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1957 \param ftdi pointer to ftdi_context
1958 \param pins Pointer to store pins into
1961 \retval -1: read pins failed
1962 \retval -2: USB device unavailable
1964 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1966 if (ftdi == NULL || ftdi->usb_dev == NULL)
1967 ftdi_error_return(-2, "USB device unavailable");
1969 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)
1970 ftdi_error_return(-1, "read pins failed");
1978 The FTDI chip keeps data in the internal buffer for a specific
1979 amount of time if the buffer is not full yet to decrease
1980 load on the usb bus.
1982 \param ftdi pointer to ftdi_context
1983 \param latency Value between 1 and 255
1986 \retval -1: latency out of range
1987 \retval -2: unable to set latency timer
1988 \retval -3: USB device unavailable
1990 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1992 unsigned short usb_val;
1995 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1997 if (ftdi == NULL || ftdi->usb_dev == NULL)
1998 ftdi_error_return(-3, "USB device unavailable");
2001 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)
2002 ftdi_error_return(-2, "unable to set latency timer");
2010 \param ftdi pointer to ftdi_context
2011 \param latency Pointer to store latency value in
2014 \retval -1: unable to get latency timer
2015 \retval -2: USB device unavailable
2017 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
2019 unsigned short usb_val;
2021 if (ftdi == NULL || ftdi->usb_dev == NULL)
2022 ftdi_error_return(-2, "USB device unavailable");
2024 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)
2025 ftdi_error_return(-1, "reading latency timer failed");
2027 *latency = (unsigned char)usb_val;
2032 Poll modem status information
2034 This function allows the retrieve the two status bytes of the device.
2035 The device sends these bytes also as a header for each read access
2036 where they are discarded by ftdi_read_data(). The chip generates
2037 the two stripped status bytes in the absence of data every 40 ms.
2039 Layout of the first byte:
2040 - B0..B3 - must be 0
2041 - B4 Clear to send (CTS)
2044 - B5 Data set ready (DTS)
2047 - B6 Ring indicator (RI)
2050 - B7 Receive line signal detect (RLSD)
2054 Layout of the second byte:
2055 - B0 Data ready (DR)
2056 - B1 Overrun error (OE)
2057 - B2 Parity error (PE)
2058 - B3 Framing error (FE)
2059 - B4 Break interrupt (BI)
2060 - B5 Transmitter holding register (THRE)
2061 - B6 Transmitter empty (TEMT)
2062 - B7 Error in RCVR FIFO
2064 \param ftdi pointer to ftdi_context
2065 \param status Pointer to store status information in. Must be two bytes.
2068 \retval -1: unable to retrieve status information
2069 \retval -2: USB device unavailable
2071 int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
2075 if (ftdi == NULL || ftdi->usb_dev == NULL)
2076 ftdi_error_return(-2, "USB device unavailable");
2078 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)
2079 ftdi_error_return(-1, "getting modem status failed");
2081 *status = (usb_val[1] << 8) | (usb_val[0] & 0xFF);
2087 Set flowcontrol for ftdi chip
2089 \param ftdi pointer to ftdi_context
2090 \param flowctrl flow control to use. should be
2091 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
2094 \retval -1: set flow control failed
2095 \retval -2: USB device unavailable
2097 int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
2099 if (ftdi == NULL || ftdi->usb_dev == NULL)
2100 ftdi_error_return(-2, "USB device unavailable");
2102 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2103 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
2104 NULL, 0, ftdi->usb_write_timeout) < 0)
2105 ftdi_error_return(-1, "set flow control failed");
2113 \param ftdi pointer to ftdi_context
2114 \param state state to set line to (1 or 0)
2117 \retval -1: set dtr failed
2118 \retval -2: USB device unavailable
2120 int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2122 unsigned short usb_val;
2124 if (ftdi == NULL || ftdi->usb_dev == NULL)
2125 ftdi_error_return(-2, "USB device unavailable");
2128 usb_val = SIO_SET_DTR_HIGH;
2130 usb_val = SIO_SET_DTR_LOW;
2132 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2133 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2134 NULL, 0, ftdi->usb_write_timeout) < 0)
2135 ftdi_error_return(-1, "set dtr failed");
2143 \param ftdi pointer to ftdi_context
2144 \param state state to set line to (1 or 0)
2147 \retval -1: set rts failed
2148 \retval -2: USB device unavailable
2150 int ftdi_setrts(struct ftdi_context *ftdi, int state)
2152 unsigned short usb_val;
2154 if (ftdi == NULL || ftdi->usb_dev == NULL)
2155 ftdi_error_return(-2, "USB device unavailable");
2158 usb_val = SIO_SET_RTS_HIGH;
2160 usb_val = SIO_SET_RTS_LOW;
2162 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2163 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2164 NULL, 0, ftdi->usb_write_timeout) < 0)
2165 ftdi_error_return(-1, "set of rts failed");
2171 Set dtr and rts line in one pass
2173 \param ftdi pointer to ftdi_context
2174 \param dtr DTR state to set line to (1 or 0)
2175 \param rts RTS state to set line to (1 or 0)
2178 \retval -1: set dtr/rts failed
2179 \retval -2: USB device unavailable
2181 int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2183 unsigned short usb_val;
2185 if (ftdi == NULL || ftdi->usb_dev == NULL)
2186 ftdi_error_return(-2, "USB device unavailable");
2189 usb_val = SIO_SET_DTR_HIGH;
2191 usb_val = SIO_SET_DTR_LOW;
2194 usb_val |= SIO_SET_RTS_HIGH;
2196 usb_val |= SIO_SET_RTS_LOW;
2198 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2199 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2200 NULL, 0, ftdi->usb_write_timeout) < 0)
2201 ftdi_error_return(-1, "set of rts/dtr failed");
2207 Set the special event character
2209 \param ftdi pointer to ftdi_context
2210 \param eventch Event character
2211 \param enable 0 to disable the event character, non-zero otherwise
2214 \retval -1: unable to set event character
2215 \retval -2: USB device unavailable
2217 int ftdi_set_event_char(struct ftdi_context *ftdi,
2218 unsigned char eventch, unsigned char enable)
2220 unsigned short usb_val;
2222 if (ftdi == NULL || ftdi->usb_dev == NULL)
2223 ftdi_error_return(-2, "USB device unavailable");
2229 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)
2230 ftdi_error_return(-1, "setting event character failed");
2238 \param ftdi pointer to ftdi_context
2239 \param errorch Error character
2240 \param enable 0 to disable the error character, non-zero otherwise
2243 \retval -1: unable to set error character
2244 \retval -2: USB device unavailable
2246 int ftdi_set_error_char(struct ftdi_context *ftdi,
2247 unsigned char errorch, unsigned char enable)
2249 unsigned short usb_val;
2251 if (ftdi == NULL || ftdi->usb_dev == NULL)
2252 ftdi_error_return(-2, "USB device unavailable");
2258 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)
2259 ftdi_error_return(-1, "setting error character failed");
2265 Init eeprom with default values for the connected device
2266 \param ftdi pointer to ftdi_context
2267 \param manufacturer String to use as Manufacturer
2268 \param product String to use as Product description
2269 \param serial String to use as Serial number description
2272 \retval -1: No struct ftdi_context
2273 \retval -2: No struct ftdi_eeprom
2274 \retval -3: No connected device or device not yet opened
2276 int ftdi_eeprom_initdefaults(struct ftdi_context *ftdi, char * manufacturer,
2277 char * product, char * serial)
2279 struct ftdi_eeprom *eeprom;
2282 ftdi_error_return(-1, "No struct ftdi_context");
2284 if (ftdi->eeprom == NULL)
2285 ftdi_error_return(-2,"No struct ftdi_eeprom");
2287 eeprom = ftdi->eeprom;
2288 memset(eeprom, 0, sizeof(struct ftdi_eeprom));
2290 if (ftdi->usb_dev == NULL)
2291 ftdi_error_return(-3, "No connected device or device not yet opened");
2293 eeprom->vendor_id = 0x0403;
2294 eeprom->use_serial = 1;
2295 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM) ||
2296 (ftdi->type == TYPE_R))
2297 eeprom->product_id = 0x6001;
2298 else if (ftdi->type == TYPE_4232H)
2299 eeprom->product_id = 0x6011;
2300 else if (ftdi->type == TYPE_232H)
2301 eeprom->product_id = 0x6014;
2303 eeprom->product_id = 0x6010;
2304 if (ftdi->type == TYPE_AM)
2305 eeprom->usb_version = 0x0101;
2307 eeprom->usb_version = 0x0200;
2308 eeprom->max_power = 100;
2310 if (eeprom->manufacturer)
2311 free (eeprom->manufacturer);
2312 eeprom->manufacturer = NULL;
2315 eeprom->manufacturer = malloc(strlen(manufacturer)+1);
2316 if (eeprom->manufacturer)
2317 strcpy(eeprom->manufacturer, manufacturer);
2320 if (eeprom->product)
2321 free (eeprom->product);
2322 eeprom->product = NULL;
2325 eeprom->product = malloc(strlen(product)+1);
2326 if (eeprom->product)
2327 strcpy(eeprom->product, product);
2331 const char* default_product;
2334 case TYPE_AM: default_product = "AM"; break;
2335 case TYPE_BM: default_product = "BM"; break;
2336 case TYPE_2232C: default_product = "Dual RS232"; break;
2337 case TYPE_R: default_product = "FT232R USB UART"; break;
2338 case TYPE_2232H: default_product = "Dual RS232-HS"; break;
2339 case TYPE_4232H: default_product = "FT4232H"; break;
2340 case TYPE_232H: default_product = "Single-RS232-HS"; break;
2342 ftdi_error_return(-3, "Unknown chip type");
2344 eeprom->product = malloc(strlen(default_product) +1);
2345 if (eeprom->product)
2346 strcpy(eeprom->product, default_product);
2350 free (eeprom->serial);
2351 eeprom->serial = NULL;
2354 eeprom->serial = malloc(strlen(serial)+1);
2356 strcpy(eeprom->serial, serial);
2360 if (ftdi->type == TYPE_R)
2362 eeprom->max_power = 90;
2363 eeprom->size = 0x80;
2364 eeprom->cbus_function[0] = CBUS_TXLED;
2365 eeprom->cbus_function[1] = CBUS_RXLED;
2366 eeprom->cbus_function[2] = CBUS_TXDEN;
2367 eeprom->cbus_function[3] = CBUS_PWREN;
2368 eeprom->cbus_function[4] = CBUS_SLEEP;
2372 if(ftdi->type == TYPE_232H)
2375 for (i=0; i<10; i++)
2376 eeprom->cbus_function[i] = CBUSH_TRISTATE;
2380 eeprom->initialized_for_connected_device = 1;
2383 /*FTD2XX doesn't check for values not fitting in the ACBUS Signal oprtions*/
2384 void set_ft232h_cbus(struct ftdi_eeprom *eeprom, unsigned char * output)
2389 int mode_low, mode_high;
2390 if (eeprom->cbus_function[2*i]> CBUSH_CLK7_5)
2391 mode_low = CBUSH_TRISTATE;
2393 mode_low = eeprom->cbus_function[2*i];
2394 if (eeprom->cbus_function[2*i+1]> CBUSH_CLK7_5)
2395 mode_high = CBUSH_TRISTATE;
2397 mode_high = eeprom->cbus_function[2*i];
2399 output[0x18+i] = mode_high <<4 | mode_low;
2402 /* Return the bits for the encoded EEPROM Structure of a requested Mode
2405 static unsigned char type2bit(unsigned char type, enum ftdi_chip_type chip)
2414 case CHANNEL_IS_UART: return 0;
2415 case CHANNEL_IS_FIFO: return 0x01;
2416 case CHANNEL_IS_OPTO: return 0x02;
2417 case CHANNEL_IS_CPU : return 0x04;
2425 case CHANNEL_IS_UART : return 0;
2426 case CHANNEL_IS_FIFO : return 0x01;
2427 case CHANNEL_IS_OPTO : return 0x02;
2428 case CHANNEL_IS_CPU : return 0x04;
2429 case CHANNEL_IS_FT1284 : return 0x08;
2439 Build binary buffer from ftdi_eeprom structure.
2440 Output is suitable for ftdi_write_eeprom().
2442 \param ftdi pointer to ftdi_context
2444 \retval >=0: size of eeprom user area in bytes
2445 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2446 \retval -2: Invalid eeprom or ftdi pointer
2447 \retval -3: Invalid cbus function setting (FIXME: Not in the code?)
2448 \retval -4: Chip doesn't support invert (FIXME: Not in the code?)
2449 \retval -5: Chip doesn't support high current drive (FIXME: Not in the code?)
2450 \retval -6: No connected EEPROM or EEPROM Type unknown
2452 int ftdi_eeprom_build(struct ftdi_context *ftdi)
2454 unsigned char i, j, eeprom_size_mask;
2455 unsigned short checksum, value;
2456 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2458 struct ftdi_eeprom *eeprom;
2459 unsigned char * output;
2462 ftdi_error_return(-2,"No context");
2463 if (ftdi->eeprom == NULL)
2464 ftdi_error_return(-2,"No eeprom structure");
2466 eeprom= ftdi->eeprom;
2467 output = eeprom->buf;
2469 if (eeprom->chip == -1)
2470 ftdi_error_return(-6,"No connected EEPROM or EEPROM type unknown");
2472 if ((eeprom->chip == 0x56) || (eeprom->chip == 0x66))
2473 eeprom->size = 0x100;
2475 eeprom->size = 0x80;
2477 if (eeprom->manufacturer != NULL)
2478 manufacturer_size = strlen(eeprom->manufacturer);
2479 if (eeprom->product != NULL)
2480 product_size = strlen(eeprom->product);
2481 if (eeprom->serial != NULL)
2482 serial_size = strlen(eeprom->serial);
2484 // eeprom size check
2489 user_area_size = 96; // base size for strings (total of 48 characters)
2492 user_area_size = 90; // two extra config bytes and 4 bytes PnP stuff
2495 user_area_size = 88; // four extra config bytes + 4 bytes PnP stuff
2497 case TYPE_2232H: // six extra config bytes + 4 bytes PnP stuff
2499 user_area_size = 86;
2502 user_area_size = 80;
2508 user_area_size -= (manufacturer_size + product_size + serial_size) * 2;
2510 if (user_area_size < 0)
2511 ftdi_error_return(-1,"eeprom size exceeded");
2514 memset (ftdi->eeprom->buf, 0, FTDI_MAX_EEPROM_SIZE);
2516 // Bytes and Bits set for all Types
2518 // Addr 02: Vendor ID
2519 output[0x02] = eeprom->vendor_id;
2520 output[0x03] = eeprom->vendor_id >> 8;
2522 // Addr 04: Product ID
2523 output[0x04] = eeprom->product_id;
2524 output[0x05] = eeprom->product_id >> 8;
2526 // Addr 06: Device release number (0400h for BM features)
2527 output[0x06] = 0x00;
2531 output[0x07] = 0x02;
2534 output[0x07] = 0x04;
2537 output[0x07] = 0x05;
2540 output[0x07] = 0x06;
2543 output[0x07] = 0x07;
2546 output[0x07] = 0x08;
2549 output[0x07] = 0x09;
2552 output[0x07] = 0x00;
2555 // Addr 08: Config descriptor
2557 // Bit 6: 1 if this device is self powered, 0 if bus powered
2558 // Bit 5: 1 if this device uses remote wakeup
2559 // Bit 4-0: reserved - 0
2561 if (eeprom->self_powered == 1)
2563 if (eeprom->remote_wakeup == 1)
2567 // Addr 09: Max power consumption: max power = value * 2 mA
2568 output[0x09] = eeprom->max_power>>1;
2570 if (ftdi->type != TYPE_AM)
2572 // Addr 0A: Chip configuration
2573 // Bit 7: 0 - reserved
2574 // Bit 6: 0 - reserved
2575 // Bit 5: 0 - reserved
2576 // Bit 4: 1 - Change USB version
2577 // Bit 3: 1 - Use the serial number string
2578 // Bit 2: 1 - Enable suspend pull downs for lower power
2579 // Bit 1: 1 - Out EndPoint is Isochronous
2580 // Bit 0: 1 - In EndPoint is Isochronous
2583 if (eeprom->in_is_isochronous == 1)
2585 if (eeprom->out_is_isochronous == 1)
2591 // Strings start at 0x94 (TYPE_AM, TYPE_BM)
2592 // 0x96 (TYPE_2232C), 0x98 (TYPE_R) and 0x9a (TYPE_x232H)
2610 /* Wrap around 0x80 for 128 byte EEPROMS (Internale and 93x46) */
2611 eeprom_size_mask = eeprom->size -1;
2613 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2614 // Addr 0F: Length of manufacturer string
2615 // Output manufacturer
2616 output[0x0E] = i; // calculate offset
2617 output[i & eeprom_size_mask] = manufacturer_size*2 + 2, i++;
2618 output[i & eeprom_size_mask] = 0x03, i++; // type: string
2619 for (j = 0; j < manufacturer_size; j++)
2621 output[i & eeprom_size_mask] = eeprom->manufacturer[j], i++;
2622 output[i & eeprom_size_mask] = 0x00, i++;
2624 output[0x0F] = manufacturer_size*2 + 2;
2626 // Addr 10: Offset of the product string + 0x80, calculated later
2627 // Addr 11: Length of product string
2628 output[0x10] = i | 0x80; // calculate offset
2629 output[i & eeprom_size_mask] = product_size*2 + 2, i++;
2630 output[i & eeprom_size_mask] = 0x03, i++;
2631 for (j = 0; j < product_size; j++)
2633 output[i & eeprom_size_mask] = eeprom->product[j], i++;
2634 output[i & eeprom_size_mask] = 0x00, i++;
2636 output[0x11] = product_size*2 + 2;
2638 // Addr 12: Offset of the serial string + 0x80, calculated later
2639 // Addr 13: Length of serial string
2640 output[0x12] = i | 0x80; // calculate offset
2641 output[i & eeprom_size_mask] = serial_size*2 + 2, i++;
2642 output[i & eeprom_size_mask] = 0x03, i++;
2643 for (j = 0; j < serial_size; j++)
2645 output[i & eeprom_size_mask] = eeprom->serial[j], i++;
2646 output[i & eeprom_size_mask] = 0x00, i++;
2649 // Legacy port name and PnP fields for FT2232 and newer chips
2650 if (ftdi->type > TYPE_BM)
2652 output[i & eeprom_size_mask] = 0x02; /* as seen when written with FTD2XX */
2654 output[i & eeprom_size_mask] = 0x03; /* as seen when written with FTD2XX */
2656 output[i & eeprom_size_mask] = eeprom->is_not_pnp; /* as seen when written with FTD2XX */
2660 output[0x13] = serial_size*2 + 2;
2662 if (ftdi->type > TYPE_AM) /* use_serial not used in AM devices */
2664 if (eeprom->use_serial)
2665 output[0x0A] |= USE_SERIAL_NUM;
2667 output[0x0A] &= ~USE_SERIAL_NUM;
2670 /* Bytes and Bits specific to (some) types
2671 Write linear, as this allows easier fixing*/
2677 output[0x0C] = eeprom->usb_version & 0xff;
2678 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2679 if (eeprom->use_usb_version == USE_USB_VERSION_BIT)
2680 output[0x0A] |= USE_USB_VERSION_BIT;
2682 output[0x0A] &= ~USE_USB_VERSION_BIT;
2687 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232C);
2688 if ( eeprom->channel_a_driver == DRIVER_VCP)
2689 output[0x00] |= DRIVER_VCP;
2691 output[0x00] &= ~DRIVER_VCP;
2693 if ( eeprom->high_current_a == HIGH_CURRENT_DRIVE)
2694 output[0x00] |= HIGH_CURRENT_DRIVE;
2696 output[0x00] &= ~HIGH_CURRENT_DRIVE;
2698 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232C);
2699 if ( eeprom->channel_b_driver == DRIVER_VCP)
2700 output[0x01] |= DRIVER_VCP;
2702 output[0x01] &= ~DRIVER_VCP;
2704 if ( eeprom->high_current_b == HIGH_CURRENT_DRIVE)
2705 output[0x01] |= HIGH_CURRENT_DRIVE;
2707 output[0x01] &= ~HIGH_CURRENT_DRIVE;
2709 if (eeprom->in_is_isochronous == 1)
2710 output[0x0A] |= 0x1;
2712 output[0x0A] &= ~0x1;
2713 if (eeprom->out_is_isochronous == 1)
2714 output[0x0A] |= 0x2;
2716 output[0x0A] &= ~0x2;
2717 if (eeprom->suspend_pull_downs == 1)
2718 output[0x0A] |= 0x4;
2720 output[0x0A] &= ~0x4;
2721 if (eeprom->use_usb_version == USE_USB_VERSION_BIT)
2722 output[0x0A] |= USE_USB_VERSION_BIT;
2724 output[0x0A] &= ~USE_USB_VERSION_BIT;
2726 output[0x0C] = eeprom->usb_version & 0xff;
2727 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2728 output[0x14] = eeprom->chip;
2731 if (eeprom->high_current == HIGH_CURRENT_DRIVE_R)
2732 output[0x00] |= HIGH_CURRENT_DRIVE_R;
2733 output[0x01] = 0x40; /* Hard coded Endpoint Size*/
2735 if (eeprom->suspend_pull_downs == 1)
2736 output[0x0A] |= 0x4;
2738 output[0x0A] &= ~0x4;
2739 output[0x0B] = eeprom->invert;
2740 output[0x0C] = eeprom->usb_version & 0xff;
2741 output[0x0D] = (eeprom->usb_version>>8) & 0xff;
2743 if (eeprom->cbus_function[0] > CBUS_BB)
2744 output[0x14] = CBUS_TXLED;
2746 output[0x14] = eeprom->cbus_function[0];
2748 if (eeprom->cbus_function[1] > CBUS_BB)
2749 output[0x14] |= CBUS_RXLED<<4;
2751 output[0x14] |= eeprom->cbus_function[1]<<4;
2753 if (eeprom->cbus_function[2] > CBUS_BB)
2754 output[0x15] = CBUS_TXDEN;
2756 output[0x15] = eeprom->cbus_function[2];
2758 if (eeprom->cbus_function[3] > CBUS_BB)
2759 output[0x15] |= CBUS_PWREN<<4;
2761 output[0x15] |= eeprom->cbus_function[3]<<4;
2763 if (eeprom->cbus_function[4] > CBUS_CLK6)
2764 output[0x16] = CBUS_SLEEP;
2766 output[0x16] = eeprom->cbus_function[4];
2769 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_2232H);
2770 if ( eeprom->channel_a_driver == DRIVER_VCP)
2771 output[0x00] |= DRIVER_VCP;
2773 output[0x00] &= ~DRIVER_VCP;
2775 output[0x01] = type2bit(eeprom->channel_b_type, TYPE_2232H);
2776 if ( eeprom->channel_b_driver == DRIVER_VCP)
2777 output[0x01] |= DRIVER_VCP;
2779 output[0x01] &= ~DRIVER_VCP;
2780 if (eeprom->suspend_dbus7 == SUSPEND_DBUS7_BIT)
2781 output[0x01] |= SUSPEND_DBUS7_BIT;
2783 output[0x01] &= ~SUSPEND_DBUS7_BIT;
2785 if (eeprom->suspend_pull_downs == 1)
2786 output[0x0A] |= 0x4;
2788 output[0x0A] &= ~0x4;
2790 if (eeprom->group0_drive > DRIVE_16MA)
2791 output[0x0c] |= DRIVE_16MA;
2793 output[0x0c] |= eeprom->group0_drive;
2794 if (eeprom->group0_schmitt == IS_SCHMITT)
2795 output[0x0c] |= IS_SCHMITT;
2796 if (eeprom->group0_slew == SLOW_SLEW)
2797 output[0x0c] |= SLOW_SLEW;
2799 if (eeprom->group1_drive > DRIVE_16MA)
2800 output[0x0c] |= DRIVE_16MA<<4;
2802 output[0x0c] |= eeprom->group1_drive<<4;
2803 if (eeprom->group1_schmitt == IS_SCHMITT)
2804 output[0x0c] |= IS_SCHMITT<<4;
2805 if (eeprom->group1_slew == SLOW_SLEW)
2806 output[0x0c] |= SLOW_SLEW<<4;
2808 if (eeprom->group2_drive > DRIVE_16MA)
2809 output[0x0d] |= DRIVE_16MA;
2811 output[0x0d] |= eeprom->group2_drive;
2812 if (eeprom->group2_schmitt == IS_SCHMITT)
2813 output[0x0d] |= IS_SCHMITT;
2814 if (eeprom->group2_slew == SLOW_SLEW)
2815 output[0x0d] |= SLOW_SLEW;
2817 if (eeprom->group3_drive > DRIVE_16MA)
2818 output[0x0d] |= DRIVE_16MA<<4;
2820 output[0x0d] |= eeprom->group3_drive<<4;
2821 if (eeprom->group3_schmitt == IS_SCHMITT)
2822 output[0x0d] |= IS_SCHMITT<<4;
2823 if (eeprom->group3_slew == SLOW_SLEW)
2824 output[0x0d] |= SLOW_SLEW<<4;
2826 output[0x18] = eeprom->chip;
2830 output[0x18] = eeprom->chip;
2831 fprintf(stderr,"FIXME: Build FT4232H specific EEPROM settings\n");
2834 output[0x00] = type2bit(eeprom->channel_a_type, TYPE_232H);
2835 if ( eeprom->channel_a_driver == DRIVER_VCP)
2836 output[0x00] |= DRIVER_VCPH;
2838 output[0x00] &= ~DRIVER_VCPH;
2839 if (eeprom->powersave)
2840 output[0x01] |= POWER_SAVE_DISABLE_H;
2842 output[0x01] &= ~POWER_SAVE_DISABLE_H;
2843 if (eeprom->clock_polarity)
2844 output[0x01] |= FT1284_CLK_IDLE_STATE;
2846 output[0x01] &= ~FT1284_CLK_IDLE_STATE;
2847 if (eeprom->data_order)
2848 output[0x01] |= FT1284_DATA_LSB;
2850 output[0x01] &= ~FT1284_DATA_LSB;
2851 if (eeprom->flow_control)
2852 output[0x01] |= FT1284_FLOW_CONTROL;
2854 output[0x01] &= ~FT1284_FLOW_CONTROL;
2855 if (eeprom->group0_drive > DRIVE_16MA)
2856 output[0x0c] |= DRIVE_16MA;
2858 output[0x0c] |= eeprom->group0_drive;
2859 if (eeprom->group0_schmitt == IS_SCHMITT)
2860 output[0x0c] |= IS_SCHMITT;
2861 if (eeprom->group0_slew == SLOW_SLEW)
2862 output[0x0c] |= SLOW_SLEW;
2864 if (eeprom->group1_drive > DRIVE_16MA)
2865 output[0x0d] |= DRIVE_16MA;
2867 output[0x0d] |= eeprom->group1_drive;
2868 if (eeprom->group1_schmitt == IS_SCHMITT)
2869 output[0x0d] |= IS_SCHMITT;
2870 if (eeprom->group1_slew == SLOW_SLEW)
2871 output[0x0d] |= SLOW_SLEW;
2873 set_ft232h_cbus(eeprom, output);
2875 output[0x1e] = eeprom->chip;
2876 fprintf(stderr,"FIXME: Build FT232H specific EEPROM settings\n");
2881 // calculate checksum
2884 for (i = 0; i < eeprom->size/2-1; i++)
2886 value = output[i*2];
2887 value += output[(i*2)+1] << 8;
2889 checksum = value^checksum;
2890 checksum = (checksum << 1) | (checksum >> 15);
2893 output[eeprom->size-2] = checksum;
2894 output[eeprom->size-1] = checksum >> 8;
2896 return user_area_size;
2898 /* Decode the encoded EEPROM field for the FTDI Mode into a value for the abstracted
2901 * FTD2XX doesn't allow to set multiple bits in the interface mode bitfield, and so do we
2903 static unsigned char bit2type(unsigned char bits)
2907 case 0: return CHANNEL_IS_UART;
2908 case 1: return CHANNEL_IS_FIFO;
2909 case 2: return CHANNEL_IS_OPTO;
2910 case 4: return CHANNEL_IS_CPU;
2911 case 8: return CHANNEL_IS_FT1284;
2913 fprintf(stderr," Unexpected value %d for Hardware Interface type\n",
2919 Decode binary EEPROM image into an ftdi_eeprom structure.
2921 \param ftdi pointer to ftdi_context
2922 \param verbose Decode EEPROM on stdout
2925 \retval -1: something went wrong
2927 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2928 FIXME: Strings are malloc'ed here and should be freed somewhere
2930 int ftdi_eeprom_decode(struct ftdi_context *ftdi, int verbose)
2933 unsigned short checksum, eeprom_checksum, value;
2934 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2936 struct ftdi_eeprom *eeprom;
2937 unsigned char *buf = ftdi->eeprom->buf;
2941 ftdi_error_return(-1,"No context");
2942 if (ftdi->eeprom == NULL)
2943 ftdi_error_return(-1,"No eeprom structure");
2945 eeprom = ftdi->eeprom;
2946 eeprom_size = eeprom->size;
2948 // Addr 02: Vendor ID
2949 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2951 // Addr 04: Product ID
2952 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2954 release = buf[0x06] + (buf[0x07]<<8);
2956 // Addr 08: Config descriptor
2958 // Bit 6: 1 if this device is self powered, 0 if bus powered
2959 // Bit 5: 1 if this device uses remote wakeup
2960 eeprom->self_powered = buf[0x08] & 0x40;
2961 eeprom->remote_wakeup = buf[0x08] & 0x20;
2963 // Addr 09: Max power consumption: max power = value * 2 mA
2964 eeprom->max_power = buf[0x09];
2966 // Addr 0A: Chip configuration
2967 // Bit 7: 0 - reserved
2968 // Bit 6: 0 - reserved
2969 // Bit 5: 0 - reserved
2970 // Bit 4: 1 - Change USB version on BM and 2232C
2971 // Bit 3: 1 - Use the serial number string
2972 // Bit 2: 1 - Enable suspend pull downs for lower power
2973 // Bit 1: 1 - Out EndPoint is Isochronous
2974 // Bit 0: 1 - In EndPoint is Isochronous
2976 eeprom->in_is_isochronous = buf[0x0A]&0x01;
2977 eeprom->out_is_isochronous = buf[0x0A]&0x02;
2978 eeprom->suspend_pull_downs = buf[0x0A]&0x04;
2979 eeprom->use_serial = (buf[0x0A] & USE_SERIAL_NUM)?1:0;
2980 eeprom->use_usb_version = buf[0x0A] & USE_USB_VERSION_BIT;
2982 // Addr 0C: USB version low byte when 0x0A
2983 // Addr 0D: USB version high byte when 0x0A
2984 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2986 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2987 // Addr 0F: Length of manufacturer string
2988 manufacturer_size = buf[0x0F]/2;
2989 if (eeprom->manufacturer)
2990 free(eeprom->manufacturer);
2991 if (manufacturer_size > 0)
2993 eeprom->manufacturer = malloc(manufacturer_size);
2994 if (eeprom->manufacturer)
2996 // Decode manufacturer
2997 i = buf[0x0E] & (eeprom_size -1); // offset
2998 for (j=0;j<manufacturer_size-1;j++)
3000 eeprom->manufacturer[j] = buf[2*j+i+2];
3002 eeprom->manufacturer[j] = '\0';
3005 else eeprom->manufacturer = NULL;
3007 // Addr 10: Offset of the product string + 0x80, calculated later
3008 // Addr 11: Length of product string
3009 if (eeprom->product)
3010 free(eeprom->product);
3011 product_size = buf[0x11]/2;
3012 if (product_size > 0)
3014 eeprom->product = malloc(product_size);
3015 if (eeprom->product)
3017 // Decode product name
3018 i = buf[0x10] & (eeprom_size -1); // offset
3019 for (j=0;j<product_size-1;j++)
3021 eeprom->product[j] = buf[2*j+i+2];
3023 eeprom->product[j] = '\0';
3026 else eeprom->product = NULL;
3028 // Addr 12: Offset of the serial string + 0x80, calculated later
3029 // Addr 13: Length of serial string
3031 free(eeprom->serial);
3032 serial_size = buf[0x13]/2;
3033 if (serial_size > 0)
3035 eeprom->serial = malloc(serial_size);
3039 i = buf[0x12] & (eeprom_size -1); // offset
3040 for (j=0;j<serial_size-1;j++)
3042 eeprom->serial[j] = buf[2*j+i+2];
3044 eeprom->serial[j] = '\0';
3047 else eeprom->serial = NULL;
3052 for (i = 0; i < eeprom_size/2-1; i++)
3055 value += buf[(i*2)+1] << 8;
3057 checksum = value^checksum;
3058 checksum = (checksum << 1) | (checksum >> 15);
3061 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
3063 if (eeprom_checksum != checksum)
3065 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
3066 ftdi_error_return(-1,"EEPROM checksum error");
3069 eeprom->channel_a_type = 0;
3070 if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM))
3074 else if (ftdi->type == TYPE_2232C)
3076 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3077 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3078 eeprom->high_current_a = buf[0x00] & HIGH_CURRENT_DRIVE;
3079 eeprom->channel_b_type = buf[0x01] & 0x7;
3080 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3081 eeprom->high_current_b = buf[0x01] & HIGH_CURRENT_DRIVE;
3082 eeprom->chip = buf[0x14];
3084 else if (ftdi->type == TYPE_R)
3086 /* TYPE_R flags D2XX, not VCP as all others*/
3087 eeprom->channel_a_driver = (~buf[0x00]) & DRIVER_VCP;
3088 eeprom->high_current = buf[0x00] & HIGH_CURRENT_DRIVE_R;
3089 if ( (buf[0x01]&0x40) != 0x40)
3091 "TYPE_R EEPROM byte[0x01] Bit 6 unexpected Endpoint size."
3092 " If this happened with the\n"
3093 " EEPROM programmed by FTDI tools, please report "
3094 "to libftdi@developer.intra2net.com\n");
3096 eeprom->chip = buf[0x16];
3097 // Addr 0B: Invert data lines
3098 // Works only on FT232R, not FT245R, but no way to distinguish
3099 eeprom->invert = buf[0x0B];
3100 // Addr 14: CBUS function: CBUS0, CBUS1
3101 // Addr 15: CBUS function: CBUS2, CBUS3
3102 // Addr 16: CBUS function: CBUS5
3103 eeprom->cbus_function[0] = buf[0x14] & 0x0f;
3104 eeprom->cbus_function[1] = (buf[0x14] >> 4) & 0x0f;
3105 eeprom->cbus_function[2] = buf[0x15] & 0x0f;
3106 eeprom->cbus_function[3] = (buf[0x15] >> 4) & 0x0f;
3107 eeprom->cbus_function[4] = buf[0x16] & 0x0f;
3109 else if ((ftdi->type == TYPE_2232H) ||(ftdi->type == TYPE_4232H))
3111 eeprom->channel_a_type = bit2type(buf[0x00] & 0x7);
3112 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
3113 eeprom->channel_b_type = bit2type(buf[0x01] & 0x7);
3114 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
3116 if (ftdi->type == TYPE_2232H)
3117 eeprom->suspend_dbus7 = buf[0x01] & SUSPEND_DBUS7_BIT;
3119 eeprom->chip = buf[0x18];
3120 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3121 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3122 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3123 eeprom->group1_drive = (buf[0x0c] >> 4) & 0x3;
3124 eeprom->group1_schmitt = (buf[0x0c] >> 4) & IS_SCHMITT;
3125 eeprom->group1_slew = (buf[0x0c] >> 4) & SLOW_SLEW;
3126 eeprom->group2_drive = buf[0x0d] & DRIVE_16MA;
3127 eeprom->group2_schmitt = buf[0x0d] & IS_SCHMITT;
3128 eeprom->group2_slew = buf[0x0d] & SLOW_SLEW;
3129 eeprom->group3_drive = (buf[0x0d] >> 4) & DRIVE_16MA;
3130 eeprom->group3_schmitt = (buf[0x0d] >> 4) & IS_SCHMITT;
3131 eeprom->group3_slew = (buf[0x0d] >> 4) & SLOW_SLEW;
3133 else if (ftdi->type == TYPE_232H)
3137 eeprom->channel_a_type = buf[0x00] & 0xf;
3138 eeprom->channel_a_driver = (buf[0x00] & DRIVER_VCPH)?DRIVER_VCP:0;
3139 eeprom->clock_polarity = buf[0x01] & FT1284_CLK_IDLE_STATE;
3140 eeprom->data_order = buf[0x01] & FT1284_DATA_LSB;
3141 eeprom->flow_control = buf[0x01] & FT1284_FLOW_CONTROL;
3142 eeprom->powersave = buf[0x01] & POWER_SAVE_DISABLE_H;
3143 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
3144 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
3145 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
3146 eeprom->group1_drive = buf[0x0d] & DRIVE_16MA;
3147 eeprom->group1_schmitt = buf[0x0d] & IS_SCHMITT;
3148 eeprom->group1_slew = buf[0x0d] & SLOW_SLEW;
3152 eeprom->cbus_function[2*i ] = buf[0x18+i] & 0x0f;
3153 eeprom->cbus_function[2*i+1] = (buf[0x18+i] >> 4) & 0x0f;
3155 eeprom->chip = buf[0x1e];
3156 /*FIXME: Decipher more values*/
3161 char *channel_mode[] = {"UART", "FIFO", "CPU", "OPTO", "FT1284"};
3162 fprintf(stdout, "VID: 0x%04x\n",eeprom->vendor_id);
3163 fprintf(stdout, "PID: 0x%04x\n",eeprom->product_id);
3164 fprintf(stdout, "Release: 0x%04x\n",release);
3166 if (eeprom->self_powered)
3167 fprintf(stdout, "Self-Powered%s", (eeprom->remote_wakeup)?", USB Remote Wake Up\n":"\n");
3169 fprintf(stdout, "Bus Powered: %3d mA%s", eeprom->max_power * 2,
3170 (eeprom->remote_wakeup)?" USB Remote Wake Up\n":"\n");
3171 if (eeprom->manufacturer)
3172 fprintf(stdout, "Manufacturer: %s\n",eeprom->manufacturer);
3173 if (eeprom->product)
3174 fprintf(stdout, "Product: %s\n",eeprom->product);
3176 fprintf(stdout, "Serial: %s\n",eeprom->serial);
3177 fprintf(stdout, "Checksum : %04x\n", checksum);
3178 if (ftdi->type == TYPE_R)
3179 fprintf(stdout, "Internal EEPROM\n");
3180 else if (eeprom->chip >= 0x46)
3181 fprintf(stdout, "Attached EEPROM: 93x%02x\n", eeprom->chip);
3182 if (eeprom->suspend_dbus7)
3183 fprintf(stdout, "Suspend on DBUS7\n");
3184 if (eeprom->suspend_pull_downs)
3185 fprintf(stdout, "Pull IO pins low during suspend\n");
3186 if(eeprom->powersave)
3188 if(ftdi->type >= TYPE_232H)
3189 fprintf(stdout,"Enter low power state on ACBUS7\n");
3191 if (eeprom->remote_wakeup)
3192 fprintf(stdout, "Enable Remote Wake Up\n");
3193 fprintf(stdout, "PNP: %d\n",(eeprom->is_not_pnp)?0:1);
3194 if (ftdi->type >= TYPE_2232C)
3195 fprintf(stdout,"Channel A has Mode %s%s%s\n",
3196 channel_mode[eeprom->channel_a_type],
3197 (eeprom->channel_a_driver)?" VCP":"",
3198 (eeprom->high_current_a)?" High Current IO":"");
3199 if (ftdi->type >= TYPE_232H)
3201 fprintf(stdout,"FT1284 Mode Clock is idle %s, %s first, %sFlow Control\n",
3202 (eeprom->clock_polarity)?"HIGH":"LOW",
3203 (eeprom->data_order)?"LSB":"MSB",
3204 (eeprom->flow_control)?"":"No ");
3206 if ((ftdi->type >= TYPE_2232C) && (ftdi->type != TYPE_R) && (ftdi->type != TYPE_232H))
3207 fprintf(stdout,"Channel B has Mode %s%s%s\n",
3208 channel_mode[eeprom->channel_b_type],
3209 (eeprom->channel_b_driver)?" VCP":"",
3210 (eeprom->high_current_b)?" High Current IO":"");
3211 if (((ftdi->type == TYPE_BM) || (ftdi->type == TYPE_2232C)) &&
3212 eeprom->use_usb_version == USE_USB_VERSION_BIT)
3213 fprintf(stdout,"Use explicit USB Version %04x\n",eeprom->usb_version);
3215 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
3217 fprintf(stdout,"%s has %d mA drive%s%s\n",
3218 (ftdi->type == TYPE_2232H)?"AL":"A",
3219 (eeprom->group0_drive+1) *4,
3220 (eeprom->group0_schmitt)?" Schmitt Input":"",
3221 (eeprom->group0_slew)?" Slow Slew":"");
3222 fprintf(stdout,"%s has %d mA drive%s%s\n",
3223 (ftdi->type == TYPE_2232H)?"AH":"B",
3224 (eeprom->group1_drive+1) *4,
3225 (eeprom->group1_schmitt)?" Schmitt Input":"",
3226 (eeprom->group1_slew)?" Slow Slew":"");
3227 fprintf(stdout,"%s has %d mA drive%s%s\n",
3228 (ftdi->type == TYPE_2232H)?"BL":"C",
3229 (eeprom->group2_drive+1) *4,
3230 (eeprom->group2_schmitt)?" Schmitt Input":"",
3231 (eeprom->group2_slew)?" Slow Slew":"");
3232 fprintf(stdout,"%s has %d mA drive%s%s\n",
3233 (ftdi->type == TYPE_2232H)?"BH":"D",
3234 (eeprom->group3_drive+1) *4,
3235 (eeprom->group3_schmitt)?" Schmitt Input":"",
3236 (eeprom->group3_slew)?" Slow Slew":"");
3238 else if (ftdi->type == TYPE_232H)
3241 char *cbush_mux[] = {"TRISTATE","RXLED","TXLED", "TXRXLED","PWREN",
3242 "SLEEP","DRIVE_0","DRIVE_1","IOMODE","TXDEN",
3243 "CLK30","CLK15","CLK7_5"
3245 fprintf(stdout,"ACBUS has %d mA drive%s%s\n",
3246 (eeprom->group0_drive+1) *4,
3247 (eeprom->group0_schmitt)?" Schmitt Input":"",
3248 (eeprom->group0_slew)?" Slow Slew":"");
3249 fprintf(stdout,"ADBUS has %d mA drive%s%s\n",
3250 (eeprom->group1_drive+1) *4,
3251 (eeprom->group1_schmitt)?" Schmitt Input":"",
3252 (eeprom->group1_slew)?" Slow Slew":"");
3253 for (i=0; i<10; i++)
3255 if (eeprom->cbus_function[i]<= CBUSH_CLK7_5 )
3256 fprintf(stdout,"C%d Function: %s\n", i,
3257 cbush_mux[eeprom->cbus_function[i]]);
3262 if (ftdi->type == TYPE_R)
3264 char *cbus_mux[] = {"TXDEN","PWREN","RXLED", "TXLED","TX+RXLED",
3265 "SLEEP","CLK48","CLK24","CLK12","CLK6",
3266 "IOMODE","BB_WR","BB_RD"
3268 char *cbus_BB[] = {"RXF","TXE","RD", "WR"};
3272 char *r_bits[] = {"TXD","RXD","RTS", "CTS","DTR","DSR","DCD","RI"};
3273 fprintf(stdout,"Inverted bits:");
3275 if ((eeprom->invert & (1<<i)) == (1<<i))
3276 fprintf(stdout," %s",r_bits[i]);
3277 fprintf(stdout,"\n");
3281 if (eeprom->cbus_function[i]<CBUS_BB)
3282 fprintf(stdout,"C%d Function: %s\n", i,
3283 cbus_mux[eeprom->cbus_function[i]]);
3287 /* Running MPROG show that C0..3 have fixed function Synchronous
3289 fprintf(stdout,"C%d BB Function: %s\n", i,
3292 fprintf(stdout, "Unknown CBUS mode. Might be special mode?\n");
3301 Get a value from the decoded EEPROM structure
3303 \param ftdi pointer to ftdi_context
3304 \param value_name Enum of the value to query
3305 \param value Pointer to store read value
3308 \retval -1: Value doesn't exist
3310 int ftdi_get_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int* value)
3315 *value = ftdi->eeprom->vendor_id;
3318 *value = ftdi->eeprom->product_id;
3321 *value = ftdi->eeprom->self_powered;
3324 *value = ftdi->eeprom->remote_wakeup;
3327 *value = ftdi->eeprom->is_not_pnp;
3330 *value = ftdi->eeprom->suspend_dbus7;
3332 case IN_IS_ISOCHRONOUS:
3333 *value = ftdi->eeprom->in_is_isochronous;
3335 case OUT_IS_ISOCHRONOUS:
3336 *value = ftdi->eeprom->out_is_isochronous;
3338 case SUSPEND_PULL_DOWNS:
3339 *value = ftdi->eeprom->suspend_pull_downs;
3342 *value = ftdi->eeprom->use_serial;
3345 *value = ftdi->eeprom->usb_version;
3347 case USE_USB_VERSION:
3348 *value = ftdi->eeprom->use_usb_version;
3351 *value = ftdi->eeprom->max_power;
3353 case CHANNEL_A_TYPE:
3354 *value = ftdi->eeprom->channel_a_type;
3356 case CHANNEL_B_TYPE:
3357 *value = ftdi->eeprom->channel_b_type;
3359 case CHANNEL_A_DRIVER:
3360 *value = ftdi->eeprom->channel_a_driver;
3362 case CHANNEL_B_DRIVER:
3363 *value = ftdi->eeprom->channel_b_driver;
3365 case CBUS_FUNCTION_0:
3366 *value = ftdi->eeprom->cbus_function[0];
3368 case CBUS_FUNCTION_1:
3369 *value = ftdi->eeprom->cbus_function[1];
3371 case CBUS_FUNCTION_2:
3372 *value = ftdi->eeprom->cbus_function[2];
3374 case CBUS_FUNCTION_3:
3375 *value = ftdi->eeprom->cbus_function[3];
3377 case CBUS_FUNCTION_4:
3378 *value = ftdi->eeprom->cbus_function[4];
3380 case CBUS_FUNCTION_5:
3381 *value = ftdi->eeprom->cbus_function[5];
3383 case CBUS_FUNCTION_6:
3384 *value = ftdi->eeprom->cbus_function[6];
3386 case CBUS_FUNCTION_7:
3387 *value = ftdi->eeprom->cbus_function[7];
3389 case CBUS_FUNCTION_8:
3390 *value = ftdi->eeprom->cbus_function[8];
3392 case CBUS_FUNCTION_9:
3393 *value = ftdi->eeprom->cbus_function[8];
3396 *value = ftdi->eeprom->high_current;
3398 case HIGH_CURRENT_A:
3399 *value = ftdi->eeprom->high_current_a;
3401 case HIGH_CURRENT_B:
3402 *value = ftdi->eeprom->high_current_b;
3405 *value = ftdi->eeprom->invert;
3408 *value = ftdi->eeprom->group0_drive;
3410 case GROUP0_SCHMITT:
3411 *value = ftdi->eeprom->group0_schmitt;
3414 *value = ftdi->eeprom->group0_slew;
3417 *value = ftdi->eeprom->group1_drive;
3419 case GROUP1_SCHMITT:
3420 *value = ftdi->eeprom->group1_schmitt;
3423 *value = ftdi->eeprom->group1_slew;
3426 *value = ftdi->eeprom->group2_drive;
3428 case GROUP2_SCHMITT:
3429 *value = ftdi->eeprom->group2_schmitt;
3432 *value = ftdi->eeprom->group2_slew;
3435 *value = ftdi->eeprom->group3_drive;
3437 case GROUP3_SCHMITT:
3438 *value = ftdi->eeprom->group3_schmitt;
3441 *value = ftdi->eeprom->group3_slew;
3444 *value = ftdi->eeprom->powersave;
3446 case CLOCK_POLARITY:
3447 *value = ftdi->eeprom->clock_polarity;
3450 *value = ftdi->eeprom->data_order;
3453 *value = ftdi->eeprom->flow_control;
3456 *value = ftdi->eeprom->chip;
3459 *value = ftdi->eeprom->size;
3462 ftdi_error_return(-1, "Request for unknown EEPROM value");
3468 Set a value in the decoded EEPROM Structure
3469 No parameter checking is performed
3471 \param ftdi pointer to ftdi_context
3472 \param value_name Enum of the value to set
3476 \retval -1: Value doesn't exist
3477 \retval -2: Value not user settable
3479 int ftdi_set_eeprom_value(struct ftdi_context *ftdi, enum ftdi_eeprom_value value_name, int value)
3484 ftdi->eeprom->vendor_id = value;
3487 ftdi->eeprom->product_id = value;
3490 ftdi->eeprom->self_powered = value;
3493 ftdi->eeprom->remote_wakeup = value;
3496 ftdi->eeprom->is_not_pnp = value;
3499 ftdi->eeprom->suspend_dbus7 = value;
3501 case IN_IS_ISOCHRONOUS:
3502 ftdi->eeprom->in_is_isochronous = value;
3504 case OUT_IS_ISOCHRONOUS:
3505 ftdi->eeprom->out_is_isochronous = value;
3507 case SUSPEND_PULL_DOWNS:
3508 ftdi->eeprom->suspend_pull_downs = value;
3511 ftdi->eeprom->use_serial = value;
3514 ftdi->eeprom->usb_version = value;
3516 case USE_USB_VERSION:
3517 ftdi->eeprom->use_usb_version = value;
3520 ftdi->eeprom->max_power = value;
3522 case CHANNEL_A_TYPE:
3523 ftdi->eeprom->channel_a_type = value;
3525 case CHANNEL_B_TYPE:
3526 ftdi->eeprom->channel_b_type = value;
3528 case CHANNEL_A_DRIVER:
3529 ftdi->eeprom->channel_a_driver = value;
3531 case CHANNEL_B_DRIVER:
3532 ftdi->eeprom->channel_b_driver = value;
3534 case CBUS_FUNCTION_0:
3535 ftdi->eeprom->cbus_function[0] = value;
3537 case CBUS_FUNCTION_1:
3538 ftdi->eeprom->cbus_function[1] = value;
3540 case CBUS_FUNCTION_2:
3541 ftdi->eeprom->cbus_function[2] = value;
3543 case CBUS_FUNCTION_3:
3544 ftdi->eeprom->cbus_function[3] = value;
3546 case CBUS_FUNCTION_4:
3547 ftdi->eeprom->cbus_function[4] = value;
3549 case CBUS_FUNCTION_5:
3550 ftdi->eeprom->cbus_function[5] = value;
3552 case CBUS_FUNCTION_6:
3553 ftdi->eeprom->cbus_function[6] = value;
3555 case CBUS_FUNCTION_7:
3556 ftdi->eeprom->cbus_function[7] = value;
3558 case CBUS_FUNCTION_8:
3559 ftdi->eeprom->cbus_function[8] = value;
3561 case CBUS_FUNCTION_9:
3562 ftdi->eeprom->cbus_function[9] = value;
3565 ftdi->eeprom->high_current = value;
3567 case HIGH_CURRENT_A:
3568 ftdi->eeprom->high_current_a = value;
3570 case HIGH_CURRENT_B:
3571 ftdi->eeprom->high_current_b = value;
3574 ftdi->eeprom->invert = value;
3577 ftdi->eeprom->group0_drive = value;
3579 case GROUP0_SCHMITT:
3580 ftdi->eeprom->group0_schmitt = value;
3583 ftdi->eeprom->group0_slew = value;
3586 ftdi->eeprom->group1_drive = value;
3588 case GROUP1_SCHMITT:
3589 ftdi->eeprom->group1_schmitt = value;
3592 ftdi->eeprom->group1_slew = value;
3595 ftdi->eeprom->group2_drive = value;
3597 case GROUP2_SCHMITT:
3598 ftdi->eeprom->group2_schmitt = value;
3601 ftdi->eeprom->group2_slew = value;
3604 ftdi->eeprom->group3_drive = value;
3606 case GROUP3_SCHMITT:
3607 ftdi->eeprom->group3_schmitt = value;
3610 ftdi->eeprom->group3_slew = value;
3613 ftdi->eeprom->chip = value;
3616 ftdi->eeprom->powersave = value;
3618 case CLOCK_POLARITY:
3619 ftdi->eeprom->clock_polarity = value;
3622 ftdi->eeprom->data_order = value;
3625 ftdi->eeprom->flow_control = value;
3628 ftdi_error_return(-2, "EEPROM Value can't be changed");
3630 ftdi_error_return(-1, "Request to unknown EEPROM value");
3635 /** Get the read-only buffer to the binary EEPROM content
3637 \param ftdi pointer to ftdi_context
3638 \param buf buffer to receive EEPROM content
3639 \param size Size of receiving buffer
3642 \retval -1: struct ftdi_contxt or ftdi_eeprom missing
3643 \retval -2: Not enough room to store eeprom
3645 int ftdi_get_eeprom_buf(struct ftdi_context *ftdi, unsigned char * buf, int size)
3647 if (!ftdi || !(ftdi->eeprom))
3648 ftdi_error_return(-1, "No appropriate structure");
3650 if (!buf || size < ftdi->eeprom->size)
3651 ftdi_error_return(-1, "Not enough room to store eeprom");
3653 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
3654 if (size > FTDI_MAX_EEPROM_SIZE)
3655 size = FTDI_MAX_EEPROM_SIZE;
3657 memcpy(buf, ftdi->eeprom->buf, size);
3662 /** Set the EEPROM content from the user-supplied prefilled buffer
3664 \param ftdi pointer to ftdi_context
3665 \param buf buffer to read EEPROM content
3666 \param size Size of buffer
3669 \retval -1: struct ftdi_contxt or ftdi_eeprom of buf missing
3671 int ftdi_set_eeprom_buf(struct ftdi_context *ftdi, const unsigned char * buf, int size)
3673 if (!ftdi || !(ftdi->eeprom) || !buf)
3674 ftdi_error_return(-1, "No appropriate structure");
3676 // Only copy up to FTDI_MAX_EEPROM_SIZE bytes
3677 if (size > FTDI_MAX_EEPROM_SIZE)
3678 size = FTDI_MAX_EEPROM_SIZE;
3680 memcpy(ftdi->eeprom->buf, buf, size);
3686 Read eeprom location
3688 \param ftdi pointer to ftdi_context
3689 \param eeprom_addr Address of eeprom location to be read
3690 \param eeprom_val Pointer to store read eeprom location
3693 \retval -1: read failed
3694 \retval -2: USB device unavailable
3696 int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
3698 if (ftdi == NULL || ftdi->usb_dev == NULL)
3699 ftdi_error_return(-2, "USB device unavailable");
3701 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, eeprom_addr, (unsigned char *)eeprom_val, 2, ftdi->usb_read_timeout) != 2)
3702 ftdi_error_return(-1, "reading eeprom failed");
3710 \param ftdi pointer to ftdi_context
3713 \retval -1: read failed
3714 \retval -2: USB device unavailable
3716 int ftdi_read_eeprom(struct ftdi_context *ftdi)
3721 if (ftdi == NULL || ftdi->usb_dev == NULL)
3722 ftdi_error_return(-2, "USB device unavailable");
3723 buf = ftdi->eeprom->buf;
3725 for (i = 0; i < FTDI_MAX_EEPROM_SIZE/2; i++)
3727 if (libusb_control_transfer(
3728 ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,SIO_READ_EEPROM_REQUEST, 0, i,
3729 buf+(i*2), 2, ftdi->usb_read_timeout) != 2)
3730 ftdi_error_return(-1, "reading eeprom failed");
3733 if (ftdi->type == TYPE_R)
3734 ftdi->eeprom->size = 0x80;
3735 /* Guesses size of eeprom by comparing halves
3736 - will not work with blank eeprom */
3737 else if (strrchr((const char *)buf, 0xff) == ((const char *)buf +FTDI_MAX_EEPROM_SIZE -1))
3738 ftdi->eeprom->size = -1;
3739 else if (memcmp(buf,&buf[0x80],0x80) == 0)
3740 ftdi->eeprom->size = 0x80;
3741 else if (memcmp(buf,&buf[0x40],0x40) == 0)
3742 ftdi->eeprom->size = 0x40;
3744 ftdi->eeprom->size = 0x100;
3749 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
3750 Function is only used internally
3753 static unsigned char ftdi_read_chipid_shift(unsigned char value)
3755 return ((value & 1) << 1) |
3756 ((value & 2) << 5) |
3757 ((value & 4) >> 2) |
3758 ((value & 8) << 4) |
3759 ((value & 16) >> 1) |
3760 ((value & 32) >> 1) |
3761 ((value & 64) >> 4) |
3762 ((value & 128) >> 2);
3766 Read the FTDIChip-ID from R-type devices
3768 \param ftdi pointer to ftdi_context
3769 \param chipid Pointer to store FTDIChip-ID
3772 \retval -1: read failed
3773 \retval -2: USB device unavailable
3775 int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
3777 unsigned int a = 0, b = 0;
3779 if (ftdi == NULL || ftdi->usb_dev == NULL)
3780 ftdi_error_return(-2, "USB device unavailable");
3782 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)
3784 a = a << 8 | a >> 8;
3785 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)
3787 b = b << 8 | b >> 8;
3788 a = (a << 16) | (b & 0xFFFF);
3789 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
3790 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
3791 *chipid = a ^ 0xa5f0f7d1;
3796 ftdi_error_return(-1, "read of FTDIChip-ID failed");
3800 Write eeprom location
3802 \param ftdi pointer to ftdi_context
3803 \param eeprom_addr Address of eeprom location to be written
3804 \param eeprom_val Value to be written
3807 \retval -1: write failed
3808 \retval -2: USB device unavailable
3809 \retval -3: Invalid access to checksum protected area below 0x80
3810 \retval -4: Device can't access unprotected area
3811 \retval -5: Reading chip type failed
3813 int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr,
3814 unsigned short eeprom_val)
3816 int chip_type_location;
3817 unsigned short chip_type;
3819 if (ftdi == NULL || ftdi->usb_dev == NULL)
3820 ftdi_error_return(-2, "USB device unavailable");
3822 if (eeprom_addr <0x80)
3823 ftdi_error_return(-2, "Invalid access to checksum protected area below 0x80");
3830 chip_type_location = 0x14;
3834 chip_type_location = 0x18;
3837 chip_type_location = 0x1e;
3840 ftdi_error_return(-4, "Device can't access unprotected area");
3843 if (ftdi_read_eeprom_location( ftdi, chip_type_location>>1, &chip_type))
3844 ftdi_error_return(-5, "Reading failed failed");
3845 fprintf(stderr," loc 0x%04x val 0x%04x\n", chip_type_location,chip_type);
3846 if ((chip_type & 0xff) != 0x66)
3848 ftdi_error_return(-6, "EEPROM is not of 93x66");
3851 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3852 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
3853 NULL, 0, ftdi->usb_write_timeout) != 0)
3854 ftdi_error_return(-1, "unable to write eeprom");
3862 \param ftdi pointer to ftdi_context
3865 \retval -1: read failed
3866 \retval -2: USB device unavailable
3867 \retval -3: EEPROM not initialized for the connected device;
3869 int ftdi_write_eeprom(struct ftdi_context *ftdi)
3871 unsigned short usb_val, status;
3873 unsigned char *eeprom;
3875 if (ftdi == NULL || ftdi->usb_dev == NULL)
3876 ftdi_error_return(-2, "USB device unavailable");
3878 if(ftdi->eeprom->initialized_for_connected_device == 0)
3879 ftdi_error_return(-3, "EEPROM not initialized for the connected device");
3881 eeprom = ftdi->eeprom->buf;
3883 /* These commands were traced while running MProg */
3884 if ((ret = ftdi_usb_reset(ftdi)) != 0)
3886 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
3888 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
3891 for (i = 0; i < ftdi->eeprom->size/2; i++)
3893 usb_val = eeprom[i*2];
3894 usb_val += eeprom[(i*2)+1] << 8;
3895 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3896 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
3897 NULL, 0, ftdi->usb_write_timeout) < 0)
3898 ftdi_error_return(-1, "unable to write eeprom");
3907 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
3909 \param ftdi pointer to ftdi_context
3912 \retval -1: erase failed
3913 \retval -2: USB device unavailable
3914 \retval -3: Writing magic failed
3915 \retval -4: Read EEPROM failed
3916 \retval -5: Unexpected EEPROM value
3918 #define MAGIC 0x55aa
3919 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
3921 unsigned short eeprom_value;
3922 if (ftdi == NULL || ftdi->usb_dev == NULL)
3923 ftdi_error_return(-2, "USB device unavailable");
3925 if (ftdi->type == TYPE_R)
3927 ftdi->eeprom->chip = 0;
3931 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
3932 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
3933 ftdi_error_return(-1, "unable to erase eeprom");
3936 /* detect chip type by writing 0x55AA as magic at word position 0xc0
3937 Chip is 93x46 if magic is read at word position 0x00, as wraparound happens around 0x40
3938 Chip is 93x56 if magic is read at word position 0x40, as wraparound happens around 0x80
3939 Chip is 93x66 if magic is only read at word position 0xc0*/
3940 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
3941 SIO_WRITE_EEPROM_REQUEST, MAGIC, 0xc0,
3942 NULL, 0, ftdi->usb_write_timeout) != 0)
3943 ftdi_error_return(-3, "Writing magic failed");
3944 if (ftdi_read_eeprom_location( ftdi, 0x00, &eeprom_value))
3945 ftdi_error_return(-4, "Reading failed failed");
3946 if (eeprom_value == MAGIC)
3948 ftdi->eeprom->chip = 0x46;
3952 if (ftdi_read_eeprom_location( ftdi, 0x40, &eeprom_value))
3953 ftdi_error_return(-4, "Reading failed failed");
3954 if (eeprom_value == MAGIC)
3955 ftdi->eeprom->chip = 0x56;
3958 if (ftdi_read_eeprom_location( ftdi, 0xc0, &eeprom_value))
3959 ftdi_error_return(-4, "Reading failed failed");
3960 if (eeprom_value == MAGIC)
3961 ftdi->eeprom->chip = 0x66;
3964 ftdi->eeprom->chip = -1;
3968 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST,
3969 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
3970 ftdi_error_return(-1, "unable to erase eeprom");
3975 Get string representation for last error code
3977 \param ftdi pointer to ftdi_context
3979 \retval Pointer to error string
3981 char *ftdi_get_error_string (struct ftdi_context *ftdi)
3986 return ftdi->error_str;
3989 /* @} end of doxygen libftdi group */