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 ***************************************************************************/
19 #include <sys/utsname.h>
23 /* ftdi_init return codes:
25 -1: couldn't allocate read buffer
27 int ftdi_init(struct ftdi_context *ftdi)
30 ftdi->usb_read_timeout = 5000;
31 ftdi->usb_write_timeout = 5000;
33 ftdi->type = TYPE_BM; /* chip type */
35 ftdi->bitbang_enabled = 0;
37 ftdi->readbuffer = NULL;
38 ftdi->readbuffer_offset = 0;
39 ftdi->readbuffer_remaining = 0;
40 ftdi->writebuffer_chunksize = 4096;
46 ftdi->bitbang_mode = 1; /* 1: Normal bitbang mode, 2: SPI bitbang mode */
48 ftdi->error_str = NULL;
50 /* All fine. Now allocate the readbuffer */
51 return ftdi_read_data_set_chunksize(ftdi, 4096);
55 void ftdi_deinit(struct ftdi_context *ftdi)
57 if (ftdi->readbuffer != NULL) {
58 free(ftdi->readbuffer);
59 ftdi->readbuffer = NULL;
64 void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb)
70 /* ftdi_usb_open return codes:
72 -1: usb_find_busses() failed
73 -2: usb_find_devices() failed
74 -3: usb device not found
75 -4: unable to open device
76 -5: unable to claim device
78 -7: set baudrate failed
79 -8: get product description failed
80 -9: get serial number failed
81 -10: unable to close device
83 int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
85 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
88 int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
89 const char* description, const char* serial)
92 struct usb_device *dev;
96 if (usb_find_busses() < 0) {
97 ftdi->error_str = "usb_find_busses() failed";
101 if (usb_find_devices() < 0) {
102 ftdi->error_str = "usb_find_devices() failed";
106 for (bus = usb_busses; bus; bus = bus->next) {
107 for (dev = bus->devices; dev; dev = dev->next) {
108 if (dev->descriptor.idVendor == vendor
109 && dev->descriptor.idProduct == product) {
110 if (!(ftdi->usb_dev = usb_open(dev))) {
111 ftdi->error_str = "usb_open() failed";
116 if (description != NULL) {
117 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, string, sizeof(string)) <= 0) {
118 ftdi->error_str = "unable to fetch product description\n";
119 if (usb_close (ftdi->usb_dev) != 0)
123 if (strncmp(string, description, sizeof(string)) != 0) {
124 ftdi->error_str = "product description not matching\n";
125 if (usb_close (ftdi->usb_dev) != 0)
130 if (serial != NULL) {
131 if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, string, sizeof(string)) <= 0) {
132 ftdi->error_str = "unable to fetch serial number\n";
133 if (usb_close (ftdi->usb_dev) != 0)
137 if (strncmp(string, serial, sizeof(string)) != 0) {
138 ftdi->error_str = "serial number not matching\n";
139 if (usb_close (ftdi->usb_dev) != 0)
145 if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0) {
146 ftdi->error_str = "unable to claim usb device. Make sure ftdi_sio is unloaded!";
147 if (usb_close (ftdi->usb_dev) != 0)
152 if (ftdi_usb_reset (ftdi) != 0) {
153 if (usb_close (ftdi->usb_dev) != 0)
158 if (ftdi_set_baudrate (ftdi, 9600) != 0) {
159 if (usb_close (ftdi->usb_dev) != 0)
164 // Try to guess chip type
165 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
166 if (dev->descriptor.bcdDevice == 0x400 || (dev->descriptor.bcdDevice == 0x200
167 && dev->descriptor.iSerialNumber == 0))
168 ftdi->type = TYPE_BM;
169 else if (dev->descriptor.bcdDevice == 0x200)
170 ftdi->type = TYPE_AM;
171 else if (dev->descriptor.bcdDevice == 0x500)
172 ftdi->type = TYPE_2232C;
184 int ftdi_usb_reset(struct ftdi_context *ftdi)
186 #if defined(__linux__)
187 struct utsname kernelver;
188 int k_major, k_minor, k_myver;
191 if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
192 ftdi->error_str = "FTDI reset failed";
196 #if defined(__linux__)
197 /* Kernel 2.6 (maybe higher versions, too) need an additional usb_reset */
198 if (uname(&kernelver) == 0 && sscanf(kernelver.release, "%d.%d", &k_major, &k_minor) == 2) {
199 k_myver = k_major*10 + k_minor;
201 if (k_myver >= 26 && usb_reset(ftdi->usb_dev) != 0) {
202 ftdi->error_str = "USB reset failed";
208 // Invalidate data in the readbuffer
209 ftdi->readbuffer_offset = 0;
210 ftdi->readbuffer_remaining = 0;
215 int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
217 if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 1, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
218 ftdi->error_str = "FTDI purge of RX buffer failed";
221 // Invalidate data in the readbuffer
222 ftdi->readbuffer_offset = 0;
223 ftdi->readbuffer_remaining = 0;
225 if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 2, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
226 ftdi->error_str = "FTDI purge of TX buffer failed";
234 /* ftdi_usb_close return codes
236 -1: usb_release failed
239 int ftdi_usb_close(struct ftdi_context *ftdi)
243 if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0)
246 if (usb_close (ftdi->usb_dev) != 0)
254 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
255 Function is only used internally
257 static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
258 unsigned short *value, unsigned short *index)
260 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
261 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
262 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
263 int divisor, best_divisor, best_baud, best_baud_diff;
264 unsigned long encoded_divisor;
272 divisor = 24000000 / baudrate;
274 if (ftdi->type == TYPE_AM) {
275 // Round down to supported fraction (AM only)
276 divisor -= am_adjust_dn[divisor & 7];
279 // Try this divisor and the one above it (because division rounds down)
283 for (i = 0; i < 2; i++) {
284 int try_divisor = divisor + i;
288 // Round up to supported divisor value
289 if (try_divisor < 8) {
290 // Round up to minimum supported divisor
292 } else if (ftdi->type != TYPE_AM && try_divisor < 12) {
293 // BM doesn't support divisors 9 through 11 inclusive
295 } else if (divisor < 16) {
296 // AM doesn't support divisors 9 through 15 inclusive
299 if (ftdi->type == TYPE_AM) {
300 // Round up to supported fraction (AM only)
301 try_divisor += am_adjust_up[try_divisor & 7];
302 if (try_divisor > 0x1FFF8) {
303 // Round down to maximum supported divisor value (for AM)
304 try_divisor = 0x1FFF8;
307 if (try_divisor > 0x1FFFF) {
308 // Round down to maximum supported divisor value (for BM)
309 try_divisor = 0x1FFFF;
313 // Get estimated baud rate (to nearest integer)
314 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
315 // Get absolute difference from requested baud rate
316 if (baud_estimate < baudrate) {
317 baud_diff = baudrate - baud_estimate;
319 baud_diff = baud_estimate - baudrate;
321 if (i == 0 || baud_diff < best_baud_diff) {
322 // Closest to requested baud rate so far
323 best_divisor = try_divisor;
324 best_baud = baud_estimate;
325 best_baud_diff = baud_diff;
326 if (baud_diff == 0) {
327 // Spot on! No point trying
332 // Encode the best divisor value
333 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
334 // Deal with special cases for encoded value
335 if (encoded_divisor == 1) {
336 encoded_divisor = 0; // 3000000 baud
337 } else if (encoded_divisor == 0x4001) {
338 encoded_divisor = 1; // 2000000 baud (BM only)
340 // Split into "value" and "index" values
341 *value = (unsigned short)(encoded_divisor & 0xFFFF);
342 if(ftdi->type == TYPE_2232C) {
343 *index = (unsigned short)(encoded_divisor >> 8);
345 *index |= ftdi->interface;
348 *index = (unsigned short)(encoded_divisor >> 16);
350 // Return the nearest baud rate
355 ftdi_set_baudrate return codes:
358 -2: setting baudrate failed
360 int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
362 unsigned short value, index;
365 if (ftdi->bitbang_enabled) {
366 baudrate = baudrate*4;
369 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
370 if (actual_baudrate <= 0) {
371 ftdi->error_str = "Silly baudrate <= 0.";
375 // Check within tolerance (about 5%)
376 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
377 || ((actual_baudrate < baudrate)
378 ? (actual_baudrate * 21 < baudrate * 20)
379 : (baudrate * 21 < actual_baudrate * 20))) {
380 ftdi->error_str = "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4";
384 if (usb_control_msg(ftdi->usb_dev, 0x40, 3, value, index, NULL, 0, ftdi->usb_write_timeout) != 0) {
385 ftdi->error_str = "Setting new baudrate failed";
389 ftdi->baudrate = baudrate;
394 int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
398 int total_written = 0;
399 while (offset < size) {
400 int write_size = ftdi->writebuffer_chunksize;
402 if (offset+write_size > size)
403 write_size = size-offset;
405 ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout);
408 ftdi->error_str = "bulk write failed";
410 ftdi->error_str = "usb failed";
413 total_written += ret;
415 offset += write_size;
418 return total_written;
422 int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
424 ftdi->writebuffer_chunksize = chunksize;
429 int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
431 *chunksize = ftdi->writebuffer_chunksize;
436 int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
438 int offset = 0, ret = 1, i, num_of_chunks, chunk_remains;
440 // everything we want is still in the readbuffer?
441 if (size <= ftdi->readbuffer_remaining) {
442 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
445 ftdi->readbuffer_remaining -= size;
446 ftdi->readbuffer_offset += size;
448 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
452 // something still in the readbuffer, but not enough to satisfy 'size'?
453 if (ftdi->readbuffer_remaining != 0) {
454 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
457 offset += ftdi->readbuffer_remaining;
459 // do the actual USB read
460 while (offset < size && ret > 0) {
461 ftdi->readbuffer_remaining = 0;
462 ftdi->readbuffer_offset = 0;
463 /* returns how much received */
464 ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout);
468 ftdi->error_str = "bulk read failed";
470 ftdi->error_str = "usb failed";
475 // skip FTDI status bytes.
476 // Maybe stored in the future to enable modem use
477 num_of_chunks = ret / 64;
478 chunk_remains = ret % 64;
479 //printf("ret = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", ret, num_of_chunks, chunk_remains, ftdi->readbuffer_offset);
481 ftdi->readbuffer_offset += 2;
485 for (i = 1; i < num_of_chunks; i++)
486 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i,
487 ftdi->readbuffer+ftdi->readbuffer_offset+64*i,
489 if (chunk_remains > 2) {
490 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i,
491 ftdi->readbuffer+ftdi->readbuffer_offset+64*i,
493 ret -= 2*num_of_chunks;
495 ret -= 2*(num_of_chunks-1)+chunk_remains;
497 } else if (ret <= 2) {
498 // no more data to read?
502 // data still fits in buf?
503 if (offset+ret <= size) {
504 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret);
505 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
508 /* Did we read exactly the right amount of bytes? */
512 // only copy part of the data or size <= readbuffer_chunksize
513 int part_size = size-offset;
514 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
516 ftdi->readbuffer_offset += part_size;
517 ftdi->readbuffer_remaining = ret-part_size;
520 /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n",
521 part_size, size, offset, ret, ftdi->readbuffer_remaining); */
532 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
534 unsigned char *new_buf;
536 // Invalidate all remaining data
537 ftdi->readbuffer_offset = 0;
538 ftdi->readbuffer_remaining = 0;
540 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) {
541 ftdi->error_str = "out of memory for readbuffer";
545 ftdi->readbuffer = new_buf;
546 ftdi->readbuffer_chunksize = chunksize;
552 int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
554 *chunksize = ftdi->readbuffer_chunksize;
560 int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
562 unsigned short usb_val;
564 usb_val = bitmask; // low byte: bitmask
565 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
566 usb_val |= (ftdi->bitbang_mode << 8);
568 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
569 ftdi->error_str = "Unable to enter bitbang mode. Perhaps not a BM type chip?";
572 ftdi->bitbang_enabled = 1;
577 int ftdi_disable_bitbang(struct ftdi_context *ftdi)
579 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
580 ftdi->error_str = "Unable to leave bitbang mode. Perhaps not a BM type chip?";
584 ftdi->bitbang_enabled = 0;
589 int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
591 unsigned short usb_val;
592 if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0C, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) {
593 ftdi->error_str = "Read pins failed";
597 *pins = (unsigned char)usb_val;
602 int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
604 unsigned short usb_val;
607 ftdi->error_str = "Latency out of range. Only valid for 1-255";
612 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x09, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) {
613 ftdi->error_str = "Unable to set latency timer";
620 int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
622 unsigned short usb_val;
623 if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0A, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) {
624 ftdi->error_str = "Reading latency timer failed";
628 *latency = (unsigned char)usb_val;
633 void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom)
635 eeprom->vendor_id = 0x0403;
636 eeprom->product_id = 0x6001;
638 eeprom->self_powered = 1;
639 eeprom->remote_wakeup = 1;
640 eeprom->BM_type_chip = 1;
642 eeprom->in_is_isochronous = 0;
643 eeprom->out_is_isochronous = 0;
644 eeprom->suspend_pull_downs = 0;
646 eeprom->use_serial = 0;
647 eeprom->change_usb_version = 0;
648 eeprom->usb_version = 0x0200;
649 eeprom->max_power = 0;
651 eeprom->manufacturer = NULL;
652 eeprom->product = NULL;
653 eeprom->serial = NULL;
658 ftdi_eeprom_build return codes:
659 positive value: used eeprom size
660 -1: eeprom size (128 bytes) exceeded by custom strings
662 int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output)
665 unsigned short checksum, value;
666 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
669 if (eeprom->manufacturer != NULL)
670 manufacturer_size = strlen(eeprom->manufacturer);
671 if (eeprom->product != NULL)
672 product_size = strlen(eeprom->product);
673 if (eeprom->serial != NULL)
674 serial_size = strlen(eeprom->serial);
676 size_check = 128; // eeprom is 128 bytes
677 size_check -= 28; // 28 are always in use (fixed)
678 size_check -= manufacturer_size*2;
679 size_check -= product_size*2;
680 size_check -= serial_size*2;
682 // eeprom size exceeded?
687 memset (output, 0, 128);
689 // Addr 00: Stay 00 00
690 // Addr 02: Vendor ID
691 output[0x02] = eeprom->vendor_id;
692 output[0x03] = eeprom->vendor_id >> 8;
694 // Addr 04: Product ID
695 output[0x04] = eeprom->product_id;
696 output[0x05] = eeprom->product_id >> 8;
698 // Addr 06: Device release number (0400h for BM features)
701 if (eeprom->BM_type_chip == 1)
706 // Addr 08: Config descriptor
707 // Bit 1: remote wakeup if 1
708 // Bit 0: self powered if 1
711 if (eeprom->self_powered == 1)
713 if (eeprom->remote_wakeup == 1)
717 // Addr 09: Max power consumption: max power = value * 2 mA
718 output[0x09] = eeprom->max_power;
721 // Addr 0A: Chip configuration
722 // Bit 7: 0 - reserved
723 // Bit 6: 0 - reserved
724 // Bit 5: 0 - reserved
725 // Bit 4: 1 - Change USB version
726 // Bit 3: 1 - Use the serial number string
727 // Bit 2: 1 - Enable suspend pull downs for lower power
728 // Bit 1: 1 - Out EndPoint is Isochronous
729 // Bit 0: 1 - In EndPoint is Isochronous
732 if (eeprom->in_is_isochronous == 1)
734 if (eeprom->out_is_isochronous == 1)
736 if (eeprom->suspend_pull_downs == 1)
738 if (eeprom->use_serial == 1)
740 if (eeprom->change_usb_version == 1)
747 // Addr 0C: USB version low byte when 0x0A bit 4 is set
748 // Addr 0D: USB version high byte when 0x0A bit 4 is set
749 if (eeprom->change_usb_version == 1) {
750 output[0x0C] = eeprom->usb_version;
751 output[0x0D] = eeprom->usb_version >> 8;
755 // Addr 0E: Offset of the manufacturer string + 0x80
756 output[0x0E] = 0x14 + 0x80;
758 // Addr 0F: Length of manufacturer string
759 output[0x0F] = manufacturer_size*2 + 2;
761 // Addr 10: Offset of the product string + 0x80, calculated later
762 // Addr 11: Length of product string
763 output[0x11] = product_size*2 + 2;
765 // Addr 12: Offset of the serial string + 0x80, calculated later
766 // Addr 13: Length of serial string
767 output[0x13] = serial_size*2 + 2;
770 output[0x14] = manufacturer_size*2 + 2;
771 output[0x15] = 0x03; // type: string
775 // Output manufacturer
776 for (j = 0; j < manufacturer_size; j++) {
777 output[i] = eeprom->manufacturer[j], i++;
778 output[i] = 0x00, i++;
781 // Output product name
782 output[0x10] = i + 0x80; // calculate offset
783 output[i] = product_size*2 + 2, i++;
784 output[i] = 0x03, i++;
785 for (j = 0; j < product_size; j++) {
786 output[i] = eeprom->product[j], i++;
787 output[i] = 0x00, i++;
791 output[0x12] = i + 0x80; // calculate offset
792 output[i] = serial_size*2 + 2, i++;
793 output[i] = 0x03, i++;
794 for (j = 0; j < serial_size; j++) {
795 output[i] = eeprom->serial[j], i++;
796 output[i] = 0x00, i++;
799 // calculate checksum
802 for (i = 0; i < 63; i++) {
804 value += output[(i*2)+1] << 8;
806 checksum = value^checksum;
807 checksum = (checksum << 1) | (checksum >> 15);
810 output[0x7E] = checksum;
811 output[0x7F] = checksum >> 8;
817 int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
821 for (i = 0; i < 64; i++) {
822 if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) {
823 ftdi->error_str = "Reading eeprom failed";
832 int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
834 unsigned short usb_val;
837 for (i = 0; i < 64; i++) {
838 usb_val = eeprom[i*2];
839 usb_val += eeprom[(i*2)+1] << 8;
840 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x91, usb_val, i, NULL, 0, ftdi->usb_write_timeout) != 0) {
841 ftdi->error_str = "Unable to write eeprom";
850 int ftdi_erase_eeprom(struct ftdi_context *ftdi)
852 if (usb_control_msg(ftdi->usb_dev, 0x40, 0x92, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0) {
853 ftdi->error_str = "Unable to erase eeprom";