1 /***************************************************************************
5 copyright : (C) 2003 by Intra2net AG
6 email : opensource@intra2net.com
7 ***************************************************************************/
9 /***************************************************************************
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU Lesser General Public License *
13 * version 2.1 as published by the Free Software Foundation; *
15 ***************************************************************************/
22 /* ftdi_init return codes:
24 -1: couldn't allocate read buffer
26 int ftdi_init(struct ftdi_context *ftdi)
29 ftdi->usb_read_timeout = 5000;
30 ftdi->usb_write_timeout = 5000;
32 ftdi->type = TYPE_BM; /* chip type */
34 ftdi->bitbang_enabled = 0;
36 ftdi->readbuffer = NULL;
37 ftdi->readbuffer_offset = 0;
38 ftdi->readbuffer_remaining = 0;
39 ftdi->writebuffer_chunksize = 4096;
45 ftdi->bitbang_mode = 1; /* 1: Normal bitbang mode, 2: SPI bitbang mode */
47 ftdi->error_str = NULL;
49 /* All fine. Now allocate the readbuffer */
50 return ftdi_read_data_set_chunksize(ftdi, 4096);
54 void ftdi_deinit(struct ftdi_context *ftdi)
56 if (ftdi->readbuffer != NULL) {
57 free(ftdi->readbuffer);
58 ftdi->readbuffer = NULL;
63 void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb)
69 /* ftdi_usb_open return codes:
71 -1: usb_find_busses() failed
72 -2: usb_find_devices() failed
73 -3: usb device not found
74 -4: unable to open device
75 -5: unable to claim device
77 -7: set baudrate failed
78 -8: get product description failed
79 -9: get serial number failed
80 -10: unable to close device
82 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
84 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
87 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
88 const char* description, const char* serial)
91 struct usb_device *dev;
95 if (usb_find_busses() < 0) {
96 ftdi->error_str = "usb_find_busses() failed";
100 if (usb_find_devices() < 0) {
101 ftdi->error_str = "usb_find_devices() failed";
105 for (bus = usb_busses; bus; bus = bus->next) {
106 for (dev = bus->devices; dev; dev = dev->next) {
107 if (dev->descriptor.idVendor == vendor
108 && dev->descriptor.idProduct == product) {
109 if (!(ftdi->usb_dev = usb_open(dev))) {
110 ftdi->error_str = "usb_open() failed";
115 if (description != NULL) {
116 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, string, sizeof(string)) <= 0) {
117 ftdi->error_str = "unable to fetch product description\n";
118 if (usb_close (ftdi->usb_dev) != 0)
122 if (strncmp(string, description, sizeof(string)) != 0) {
123 ftdi->error_str = "product description not matching\n";
124 if (usb_close (ftdi->usb_dev) != 0)
129 if (serial != NULL) {
130 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, string, sizeof(string)) <= 0) {
131 ftdi->error_str = "unable to fetch serial number\n";
132 if (usb_close (ftdi->usb_dev) != 0)
136 if (strncmp(string, serial, sizeof(string)) != 0) {
137 ftdi->error_str = "serial number not matching\n";
138 if (usb_close (ftdi->usb_dev) != 0)
144 if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0) {
145 ftdi->error_str = "unable to claim usb device. Make sure ftdi_sio is unloaded!";
146 if (usb_close (ftdi->usb_dev) != 0)
151 if (ftdi_usb_reset (ftdi) != 0) {
152 if (usb_close (ftdi->usb_dev) != 0)
157 if (ftdi_set_baudrate (ftdi, 9600) != 0) {
158 if (usb_close (ftdi->usb_dev) != 0)
163 // Try to guess chip type
164 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
165 if (dev->descriptor.bcdDevice == 0x400 || (dev->descriptor.bcdDevice == 0x200
166 && dev->descriptor.iSerialNumber == 0))
167 ftdi->type = TYPE_BM;
168 else if (dev->descriptor.bcdDevice == 0x200)
169 ftdi->type = TYPE_AM;
170 else if (dev->descriptor.bcdDevice == 0x500)
171 ftdi->type = TYPE_2232C;
183 int ftdi_usb_reset(struct ftdi_context *ftdi)
185 if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
186 ftdi->error_str = "FTDI reset failed";
190 if (usb_reset(ftdi->usb_dev) != 0) {
191 ftdi->error_str = "USB reset failed";
195 // Invalidate data in the readbuffer
196 ftdi->readbuffer_offset = 0;
197 ftdi->readbuffer_remaining = 0;
202 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
204 if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 1, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
205 ftdi->error_str = "FTDI purge of RX buffer failed";
208 // Invalidate data in the readbuffer
209 ftdi->readbuffer_offset = 0;
210 ftdi->readbuffer_remaining = 0;
212 if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 2, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
213 ftdi->error_str = "FTDI purge of TX buffer failed";
221 /* ftdi_usb_close return codes
223 -1: usb_release failed
226 int ftdi_usb_close(struct ftdi_context *ftdi)
230 if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0)
233 if (usb_close (ftdi->usb_dev) != 0)
241 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
242 Function is only used internally
244 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
245 unsigned short *value, unsigned short *index)
247 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
248 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
249 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
250 int divisor, best_divisor, best_baud, best_baud_diff;
251 unsigned long encoded_divisor;
259 divisor = 24000000 / baudrate;
261 if (ftdi->type == TYPE_AM) {
262 // Round down to supported fraction (AM only)
263 divisor -= am_adjust_dn[divisor & 7];
266 // Try this divisor and the one above it (because division rounds down)
270 for (i = 0; i < 2; i++) {
271 int try_divisor = divisor + i;
275 // Round up to supported divisor value
276 if (try_divisor < 8) {
277 // Round up to minimum supported divisor
279 } else if (ftdi->type != TYPE_AM && try_divisor < 12) {
280 // BM doesn't support divisors 9 through 11 inclusive
282 } else if (divisor < 16) {
283 // AM doesn't support divisors 9 through 15 inclusive
286 if (ftdi->type == TYPE_AM) {
287 // Round up to supported fraction (AM only)
288 try_divisor += am_adjust_up[try_divisor & 7];
289 if (try_divisor > 0x1FFF8) {
290 // Round down to maximum supported divisor value (for AM)
291 try_divisor = 0x1FFF8;
294 if (try_divisor > 0x1FFFF) {
295 // Round down to maximum supported divisor value (for BM)
296 try_divisor = 0x1FFFF;
300 // Get estimated baud rate (to nearest integer)
301 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
302 // Get absolute difference from requested baud rate
303 if (baud_estimate < baudrate) {
304 baud_diff = baudrate - baud_estimate;
306 baud_diff = baud_estimate - baudrate;
308 if (i == 0 || baud_diff < best_baud_diff) {
309 // Closest to requested baud rate so far
310 best_divisor = try_divisor;
311 best_baud = baud_estimate;
312 best_baud_diff = baud_diff;
313 if (baud_diff == 0) {
314 // Spot on! No point trying
319 // Encode the best divisor value
320 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
321 // Deal with special cases for encoded value
322 if (encoded_divisor == 1) {
323 encoded_divisor = 0; // 3000000 baud
324 } else if (encoded_divisor == 0x4001) {
325 encoded_divisor = 1; // 2000000 baud (BM only)
327 // Split into "value" and "index" values
328 *value = (unsigned short)(encoded_divisor & 0xFFFF);
329 if(ftdi->type == TYPE_2232C) {
330 *index = (unsigned short)(encoded_divisor >> 8);
332 *index |= ftdi->interface;
335 *index = (unsigned short)(encoded_divisor >> 16);
337 // Return the nearest baud rate
342 ftdi_set_baudrate return codes:
345 -2: setting baudrate failed
347 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
349 unsigned short value, index;
352 if (ftdi->bitbang_enabled) {
353 baudrate = baudrate*4;
356 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
357 if (actual_baudrate <= 0) {
358 ftdi->error_str = "Silly baudrate <= 0.";
362 // Check within tolerance (about 5%)
363 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
364 || ((actual_baudrate < baudrate)
365 ? (actual_baudrate * 21 < baudrate * 20)
366 : (baudrate * 21 < actual_baudrate * 20))) {
367 ftdi->error_str = "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4";
371 if (usb_control_msg(ftdi->usb_dev, 0x40, 3, value, index, NULL, 0, ftdi->usb_write_timeout) != 0) {
372 ftdi->error_str = "Setting new baudrate failed";
376 ftdi->baudrate = baudrate;
381 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
385 int total_written = 0;
386 while (offset < size) {
387 int write_size = ftdi->writebuffer_chunksize;
389 if (offset+write_size > size)
390 write_size = size-offset;
392 ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout);
395 ftdi->error_str = "bulk write failed";
397 ftdi->error_str = "usb failed";
400 total_written += ret;
402 offset += write_size;
405 return total_written;
409 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
411 ftdi->writebuffer_chunksize = chunksize;
416 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
418 *chunksize = ftdi->writebuffer_chunksize;
423 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
425 int offset = 0, ret = 1, i, num_of_chunks, chunk_remains;
427 // everything we want is still in the readbuffer?
428 if (size <= ftdi->readbuffer_remaining) {
429 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
432 ftdi->readbuffer_remaining -= size;
433 ftdi->readbuffer_offset += size;
435 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
439 // something still in the readbuffer, but not enough to satisfy 'size'?
440 if (ftdi->readbuffer_remaining != 0) {
441 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
444 offset += ftdi->readbuffer_remaining;
446 // do the actual USB read
447 while (offset < size && ret > 0) {
448 ftdi->readbuffer_remaining = 0;
449 ftdi->readbuffer_offset = 0;
450 /* returns how much received */
451 ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout);
455 ftdi->error_str = "bulk read failed";
457 ftdi->error_str = "usb failed";
462 // skip FTDI status bytes.
463 // Maybe stored in the future to enable modem use
464 num_of_chunks = ret / 64;
465 chunk_remains = ret % 64;
466 //printf("ret = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", ret, num_of_chunks, chunk_remains, ftdi->readbuffer_offset);
468 ftdi->readbuffer_offset += 2;
472 for (i = 1; i < num_of_chunks; i++)
473 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i,
474 ftdi->readbuffer+ftdi->readbuffer_offset+64*i,
476 if (chunk_remains > 2) {
477 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i,
478 ftdi->readbuffer+ftdi->readbuffer_offset+64*i,
480 ret -= 2*num_of_chunks;
482 ret -= 2*(num_of_chunks-1)+chunk_remains;
484 } else if (ret <= 2) {
485 // no more data to read?
489 // data still fits in buf?
490 if (offset+ret <= size) {
491 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret);
492 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
495 /* Did we read exactly the right amount of bytes? */
499 // only copy part of the data or size <= readbuffer_chunksize
500 int part_size = size-offset;
501 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
503 ftdi->readbuffer_offset += part_size;
504 ftdi->readbuffer_remaining = ret-part_size;
507 /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n",
508 part_size, size, offset, ret, ftdi->readbuffer_remaining); */
519 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
521 unsigned char *new_buf;
523 // Invalidate all remaining data
524 ftdi->readbuffer_offset = 0;
525 ftdi->readbuffer_remaining = 0;
527 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) {
528 ftdi->error_str = "out of memory for readbuffer";
532 ftdi->readbuffer = new_buf;
533 ftdi->readbuffer_chunksize = chunksize;
539 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
541 *chunksize = ftdi->readbuffer_chunksize;
547 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
549 unsigned short usb_val;
551 usb_val = bitmask; // low byte: bitmask
552 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
553 usb_val |= (ftdi->bitbang_mode << 8);
555 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
556 ftdi->error_str = "Unable to enter bitbang mode. Perhaps not a BM type chip?";
559 ftdi->bitbang_enabled = 1;
564 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
566 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
567 ftdi->error_str = "Unable to leave bitbang mode. Perhaps not a BM type chip?";
571 ftdi->bitbang_enabled = 0;
576 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
578 unsigned short usb_val;
579 if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0C, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) {
580 ftdi->error_str = "Read pins failed";
584 *pins = (unsigned char)usb_val;
589 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
591 unsigned short usb_val;
594 ftdi->error_str = "Latency out of range. Only valid for 1-255";
599 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x09, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
600 ftdi->error_str = "Unable to set latency timer";
607 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
609 unsigned short usb_val;
610 if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0A, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) {
611 ftdi->error_str = "Reading latency timer failed";
615 *latency = (unsigned char)usb_val;
620 void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom)
622 eeprom->vendor_id = 0x0403;
623 eeprom->product_id = 0x6001;
625 eeprom->self_powered = 1;
626 eeprom->remote_wakeup = 1;
627 eeprom->BM_type_chip = 1;
629 eeprom->in_is_isochronous = 0;
630 eeprom->out_is_isochronous = 0;
631 eeprom->suspend_pull_downs = 0;
633 eeprom->use_serial = 0;
634 eeprom->change_usb_version = 0;
635 eeprom->usb_version = 0x0200;
636 eeprom->max_power = 0;
638 eeprom->manufacturer = NULL;
639 eeprom->product = NULL;
640 eeprom->serial = NULL;
645 ftdi_eeprom_build return codes:
646 positive value: used eeprom size
647 -1: eeprom size (128 bytes) exceeded by custom strings
649 int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output)
652 unsigned short checksum, value;
653 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
656 if (eeprom->manufacturer != NULL)
657 manufacturer_size = strlen(eeprom->manufacturer);
658 if (eeprom->product != NULL)
659 product_size = strlen(eeprom->product);
660 if (eeprom->serial != NULL)
661 serial_size = strlen(eeprom->serial);
663 size_check = 128; // eeprom is 128 bytes
664 size_check -= 28; // 28 are always in use (fixed)
665 size_check -= manufacturer_size*2;
666 size_check -= product_size*2;
667 size_check -= serial_size*2;
669 // eeprom size exceeded?
674 memset (output, 0, 128);
676 // Addr 00: Stay 00 00
677 // Addr 02: Vendor ID
678 output[0x02] = eeprom->vendor_id;
679 output[0x03] = eeprom->vendor_id >> 8;
681 // Addr 04: Product ID
682 output[0x04] = eeprom->product_id;
683 output[0x05] = eeprom->product_id >> 8;
685 // Addr 06: Device release number (0400h for BM features)
688 if (eeprom->BM_type_chip == 1)
693 // Addr 08: Config descriptor
694 // Bit 1: remote wakeup if 1
695 // Bit 0: self powered if 1
698 if (eeprom->self_powered == 1)
700 if (eeprom->remote_wakeup == 1)
704 // Addr 09: Max power consumption: max power = value * 2 mA
705 output[0x09] = eeprom->max_power;
708 // Addr 0A: Chip configuration
709 // Bit 7: 0 - reserved
710 // Bit 6: 0 - reserved
711 // Bit 5: 0 - reserved
712 // Bit 4: 1 - Change USB version
713 // Bit 3: 1 - Use the serial number string
714 // Bit 2: 1 - Enable suspend pull downs for lower power
715 // Bit 1: 1 - Out EndPoint is Isochronous
716 // Bit 0: 1 - In EndPoint is Isochronous
719 if (eeprom->in_is_isochronous == 1)
721 if (eeprom->out_is_isochronous == 1)
723 if (eeprom->suspend_pull_downs == 1)
725 if (eeprom->use_serial == 1)
727 if (eeprom->change_usb_version == 1)
734 // Addr 0C: USB version low byte when 0x0A bit 4 is set
735 // Addr 0D: USB version high byte when 0x0A bit 4 is set
736 if (eeprom->change_usb_version == 1) {
737 output[0x0C] = eeprom->usb_version;
738 output[0x0D] = eeprom->usb_version >> 8;
742 // Addr 0E: Offset of the manufacturer string + 0x80
743 output[0x0E] = 0x14 + 0x80;
745 // Addr 0F: Length of manufacturer string
746 output[0x0F] = manufacturer_size*2 + 2;
748 // Addr 10: Offset of the product string + 0x80, calculated later
749 // Addr 11: Length of product string
750 output[0x11] = product_size*2 + 2;
752 // Addr 12: Offset of the serial string + 0x80, calculated later
753 // Addr 13: Length of serial string
754 output[0x13] = serial_size*2 + 2;
757 output[0x14] = manufacturer_size*2 + 2;
758 output[0x15] = 0x03; // type: string
762 // Output manufacturer
763 for (j = 0; j < manufacturer_size; j++) {
764 output[i] = eeprom->manufacturer[j], i++;
765 output[i] = 0x00, i++;
768 // Output product name
769 output[0x10] = i + 0x80; // calculate offset
770 output[i] = product_size*2 + 2, i++;
771 output[i] = 0x03, i++;
772 for (j = 0; j < product_size; j++) {
773 output[i] = eeprom->product[j], i++;
774 output[i] = 0x00, i++;
778 output[0x12] = i + 0x80; // calculate offset
779 output[i] = serial_size*2 + 2, i++;
780 output[i] = 0x03, i++;
781 for (j = 0; j < serial_size; j++) {
782 output[i] = eeprom->serial[j], i++;
783 output[i] = 0x00, i++;
786 // calculate checksum
789 for (i = 0; i < 63; i++) {
791 value += output[(i*2)+1] << 8;
793 checksum = value^checksum;
794 checksum = (checksum << 1) | (checksum >> 15);
797 output[0x7E] = checksum;
798 output[0x7F] = checksum >> 8;
804 int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
808 for (i = 0; i < 64; i++) {
809 if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) {
810 ftdi->error_str = "Reading eeprom failed";
819 int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
821 unsigned short usb_val;
824 for (i = 0; i < 64; i++) {
825 usb_val = eeprom[i*2];
826 usb_val += eeprom[(i*2)+1] << 8;
827 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x91, usb_val, i, NULL, 0, ftdi->usb_write_timeout) != 0) {
828 ftdi->error_str = "Unable to write eeprom";
837 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
839 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x92, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0) {
840 ftdi->error_str = "Unable to erase eeprom";