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[libftdi] / src / ftdi.c
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1/***************************************************************************
2 ftdi.c - description
3 -------------------
4 begin : Fri Apr 4 2003
5 copyright : (C) 2003-2010 by Intra2net AG
6 email : opensource@intra2net.com
7 ***************************************************************************/
8
9/***************************************************************************
10 * *
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; *
14 * *
15 ***************************************************************************/
16
17/**
18 \mainpage libftdi API documentation
19
20 Library to talk to FTDI chips. You find the latest versions of libftdi at
21 http://www.intra2net.com/en/developer/libftdi/
22
23 The library is easy to use. Have a look at this short example:
24 \include simple.c
25
26 More examples can be found in the "examples" directory.
27*/
28/** \addtogroup libftdi */
29/* @{ */
30
31#include <libusb.h>
32#include <string.h>
33#include <errno.h>
34#include <stdio.h>
35#include <stdlib.h>
36
37#include "ftdi.h"
38
39#define ftdi_error_return(code, str) do { \
40 ftdi->error_str = str; \
41 return code; \
42 } while(0);
43
44#define ftdi_error_return_free_device_list(code, str, devs) do { \
45 libusb_free_device_list(devs,1); \
46 ftdi->error_str = str; \
47 return code; \
48 } while(0);
49
50
51/**
52 Internal function to close usb device pointer.
53 Sets ftdi->usb_dev to NULL.
54 \internal
55
56 \param ftdi pointer to ftdi_context
57
58 \retval none
59*/
60static void ftdi_usb_close_internal (struct ftdi_context *ftdi)
61{
62 if (ftdi && ftdi->usb_dev)
63 {
64 libusb_close (ftdi->usb_dev);
65 ftdi->usb_dev = NULL;
66 }
67}
68
69/**
70 Initializes a ftdi_context.
71
72 \param ftdi pointer to ftdi_context
73
74 \retval 0: all fine
75 \retval -1: couldn't allocate read buffer
76
77 \remark This should be called before all functions
78*/
79int ftdi_init(struct ftdi_context *ftdi)
80{
81 ftdi->usb_ctx = NULL;
82 ftdi->usb_dev = NULL;
83 ftdi->usb_read_timeout = 5000;
84 ftdi->usb_write_timeout = 5000;
85
86 ftdi->type = TYPE_BM; /* chip type */
87 ftdi->baudrate = -1;
88 ftdi->bitbang_enabled = 0; /* 0: normal mode 1: any of the bitbang modes enabled */
89
90 ftdi->readbuffer = NULL;
91 ftdi->readbuffer_offset = 0;
92 ftdi->readbuffer_remaining = 0;
93 ftdi->writebuffer_chunksize = 4096;
94 ftdi->max_packet_size = 0;
95
96 ftdi->interface = 0;
97 ftdi->index = 0;
98 ftdi->in_ep = 0x02;
99 ftdi->out_ep = 0x81;
100 ftdi->bitbang_mode = 1; /* when bitbang is enabled this holds the number of the mode */
101
102 ftdi->error_str = NULL;
103
104 ftdi->eeprom = NULL;
105
106 /* All fine. Now allocate the readbuffer */
107 return ftdi_read_data_set_chunksize(ftdi, 4096);
108}
109
110/**
111 Allocate and initialize a new ftdi_context
112
113 \return a pointer to a new ftdi_context, or NULL on failure
114*/
115struct ftdi_context *ftdi_new(void)
116{
117 struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context));
118
119 if (ftdi == NULL)
120 {
121 return NULL;
122 }
123
124 if (ftdi_init(ftdi) != 0)
125 {
126 free(ftdi);
127 return NULL;
128 }
129
130 return ftdi;
131}
132
133/**
134 Open selected channels on a chip, otherwise use first channel.
135
136 \param ftdi pointer to ftdi_context
137 \param interface Interface to use for FT2232C/2232H/4232H chips.
138
139 \retval 0: all fine
140 \retval -1: unknown interface
141 \retval -2: USB device unavailable
142*/
143int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface)
144{
145 if (ftdi == NULL)
146 ftdi_error_return(-2, "USB device unavailable");
147
148 switch (interface)
149 {
150 case INTERFACE_ANY:
151 case INTERFACE_A:
152 /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */
153 break;
154 case INTERFACE_B:
155 ftdi->interface = 1;
156 ftdi->index = INTERFACE_B;
157 ftdi->in_ep = 0x04;
158 ftdi->out_ep = 0x83;
159 break;
160 case INTERFACE_C:
161 ftdi->interface = 2;
162 ftdi->index = INTERFACE_C;
163 ftdi->in_ep = 0x06;
164 ftdi->out_ep = 0x85;
165 break;
166 case INTERFACE_D:
167 ftdi->interface = 3;
168 ftdi->index = INTERFACE_D;
169 ftdi->in_ep = 0x08;
170 ftdi->out_ep = 0x87;
171 break;
172 default:
173 ftdi_error_return(-1, "Unknown interface");
174 }
175 return 0;
176}
177
178/**
179 Deinitializes a ftdi_context.
180
181 \param ftdi pointer to ftdi_context
182*/
183void ftdi_deinit(struct ftdi_context *ftdi)
184{
185 if (ftdi == NULL)
186 return;
187
188 ftdi_usb_close_internal (ftdi);
189
190 if (ftdi->readbuffer != NULL)
191 {
192 free(ftdi->readbuffer);
193 ftdi->readbuffer = NULL;
194 }
195 libusb_exit(ftdi->usb_ctx);
196}
197
198/**
199 Deinitialize and free an ftdi_context.
200
201 \param ftdi pointer to ftdi_context
202*/
203void ftdi_free(struct ftdi_context *ftdi)
204{
205 ftdi_deinit(ftdi);
206 free(ftdi);
207}
208
209/**
210 Use an already open libusb device.
211
212 \param ftdi pointer to ftdi_context
213 \param usb libusb libusb_device_handle to use
214*/
215void ftdi_set_usbdev (struct ftdi_context *ftdi, libusb_device_handle *usb)
216{
217 if (ftdi == NULL)
218 return;
219
220 ftdi->usb_dev = usb;
221}
222
223
224/**
225 Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which
226 needs to be deallocated by ftdi_list_free() after use.
227
228 \param ftdi pointer to ftdi_context
229 \param devlist Pointer where to store list of found devices
230 \param vendor Vendor ID to search for
231 \param product Product ID to search for
232
233 \retval >0: number of devices found
234 \retval -3: out of memory
235 \retval -4: libusb_init() failed
236 \retval -5: libusb_get_device_list() failed
237 \retval -6: libusb_get_device_descriptor() failed
238*/
239int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product)
240{
241 struct ftdi_device_list **curdev;
242 libusb_device *dev;
243 libusb_device **devs;
244 int count = 0;
245 int i = 0;
246
247 if (libusb_init(&ftdi->usb_ctx) < 0)
248 ftdi_error_return(-4, "libusb_init() failed");
249
250 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
251 ftdi_error_return(-5, "libusb_get_device_list() failed");
252
253 curdev = devlist;
254 *curdev = NULL;
255
256 while ((dev = devs[i++]) != NULL)
257 {
258 struct libusb_device_descriptor desc;
259
260 if (libusb_get_device_descriptor(dev, &desc) < 0)
261 ftdi_error_return(-6, "libusb_get_device_descriptor() failed");
262
263 if (desc.idVendor == vendor && desc.idProduct == product)
264 {
265 *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list));
266 if (!*curdev)
267 ftdi_error_return(-3, "out of memory");
268
269 (*curdev)->next = NULL;
270 (*curdev)->dev = dev;
271
272 curdev = &(*curdev)->next;
273 count++;
274 }
275 }
276
277 return count;
278}
279
280/**
281 Frees a usb device list.
282
283 \param devlist USB device list created by ftdi_usb_find_all()
284*/
285void ftdi_list_free(struct ftdi_device_list **devlist)
286{
287 struct ftdi_device_list *curdev, *next;
288
289 for (curdev = *devlist; curdev != NULL;)
290 {
291 next = curdev->next;
292 free(curdev);
293 curdev = next;
294 }
295
296 *devlist = NULL;
297}
298
299/**
300 Frees a usb device list.
301
302 \param devlist USB device list created by ftdi_usb_find_all()
303*/
304void ftdi_list_free2(struct ftdi_device_list *devlist)
305{
306 ftdi_list_free(&devlist);
307}
308
309/**
310 Return device ID strings from the usb device.
311
312 The parameters manufacturer, description and serial may be NULL
313 or pointer to buffers to store the fetched strings.
314
315 \note Use this function only in combination with ftdi_usb_find_all()
316 as it closes the internal "usb_dev" after use.
317
318 \param ftdi pointer to ftdi_context
319 \param dev libusb usb_dev to use
320 \param manufacturer Store manufacturer string here if not NULL
321 \param mnf_len Buffer size of manufacturer string
322 \param description Store product description string here if not NULL
323 \param desc_len Buffer size of product description string
324 \param serial Store serial string here if not NULL
325 \param serial_len Buffer size of serial string
326
327 \retval 0: all fine
328 \retval -1: wrong arguments
329 \retval -4: unable to open device
330 \retval -7: get product manufacturer failed
331 \retval -8: get product description failed
332 \retval -9: get serial number failed
333 \retval -11: libusb_get_device_descriptor() failed
334*/
335int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
336 char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len)
337{
338 struct libusb_device_descriptor desc;
339
340 if ((ftdi==NULL) || (dev==NULL))
341 return -1;
342
343 if (libusb_open(dev, &ftdi->usb_dev) < 0)
344 ftdi_error_return(-4, "libusb_open() failed");
345
346 if (libusb_get_device_descriptor(dev, &desc) < 0)
347 ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
348
349 if (manufacturer != NULL)
350 {
351 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
352 {
353 ftdi_usb_close_internal (ftdi);
354 ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
355 }
356 }
357
358 if (description != NULL)
359 {
360 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
361 {
362 ftdi_usb_close_internal (ftdi);
363 ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
364 }
365 }
366
367 if (serial != NULL)
368 {
369 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
370 {
371 ftdi_usb_close_internal (ftdi);
372 ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
373 }
374 }
375
376 ftdi_usb_close_internal (ftdi);
377
378 return 0;
379}
380
381/**
382 * Internal function to determine the maximum packet size.
383 * \param ftdi pointer to ftdi_context
384 * \param dev libusb usb_dev to use
385 * \retval Maximum packet size for this device
386 */
387static unsigned int _ftdi_determine_max_packet_size(struct ftdi_context *ftdi, libusb_device *dev)
388{
389 struct libusb_device_descriptor desc;
390 struct libusb_config_descriptor *config0;
391 unsigned int packet_size;
392
393 // Sanity check
394 if (ftdi == NULL || dev == NULL)
395 return 64;
396
397 // Determine maximum packet size. Init with default value.
398 // New hi-speed devices from FTDI use a packet size of 512 bytes
399 // but could be connected to a normal speed USB hub -> 64 bytes packet size.
400 if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
401 packet_size = 512;
402 else
403 packet_size = 64;
404
405 if (libusb_get_device_descriptor(dev, &desc) < 0)
406 return packet_size;
407
408 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
409 return packet_size;
410
411 if (desc.bNumConfigurations > 0)
412 {
413 if (ftdi->interface < config0->bNumInterfaces)
414 {
415 struct libusb_interface interface = config0->interface[ftdi->interface];
416 if (interface.num_altsetting > 0)
417 {
418 struct libusb_interface_descriptor descriptor = interface.altsetting[0];
419 if (descriptor.bNumEndpoints > 0)
420 {
421 packet_size = descriptor.endpoint[0].wMaxPacketSize;
422 }
423 }
424 }
425 }
426
427 libusb_free_config_descriptor (config0);
428 return packet_size;
429}
430
431/**
432 Opens a ftdi device given by an usb_device.
433
434 \param ftdi pointer to ftdi_context
435 \param dev libusb usb_dev to use
436
437 \retval 0: all fine
438 \retval -3: unable to config device
439 \retval -4: unable to open device
440 \retval -5: unable to claim device
441 \retval -6: reset failed
442 \retval -7: set baudrate failed
443 \retval -8: ftdi context invalid
444 \retval -9: libusb_get_device_descriptor() failed
445 \retval -10: libusb_get_config_descriptor() failed
446 \retval -11: libusb_etach_kernel_driver() failed
447 \retval -12: libusb_get_configuration() failed
448*/
449int ftdi_usb_open_dev(struct ftdi_context *ftdi, libusb_device *dev)
450{
451 struct libusb_device_descriptor desc;
452 struct libusb_config_descriptor *config0;
453 int cfg, cfg0, detach_errno = 0;
454
455 if (ftdi == NULL)
456 ftdi_error_return(-8, "ftdi context invalid");
457
458 if (libusb_open(dev, &ftdi->usb_dev) < 0)
459 ftdi_error_return(-4, "libusb_open() failed");
460
461 if (libusb_get_device_descriptor(dev, &desc) < 0)
462 ftdi_error_return(-9, "libusb_get_device_descriptor() failed");
463
464 if (libusb_get_config_descriptor(dev, 0, &config0) < 0)
465 ftdi_error_return(-10, "libusb_get_config_descriptor() failed");
466 cfg0 = config0->bConfigurationValue;
467 libusb_free_config_descriptor (config0);
468
469 // Try to detach ftdi_sio kernel module.
470 //
471 // The return code is kept in a separate variable and only parsed
472 // if usb_set_configuration() or usb_claim_interface() fails as the
473 // detach operation might be denied and everything still works fine.
474 // Likely scenario is a static ftdi_sio kernel module.
475 if (libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface) !=0)
476 detach_errno = errno;
477
478 if (libusb_get_configuration (ftdi->usb_dev, &cfg) < 0)
479 ftdi_error_return(-12, "libusb_get_configuration () failed");
480 // set configuration (needed especially for windows)
481 // tolerate EBUSY: one device with one configuration, but two interfaces
482 // and libftdi sessions to both interfaces (e.g. FT2232)
483 if (desc.bNumConfigurations > 0 && cfg != cfg0)
484 {
485 if (libusb_set_configuration(ftdi->usb_dev, cfg0) < 0)
486 {
487 ftdi_usb_close_internal (ftdi);
488 if(detach_errno == EPERM)
489 {
490 ftdi_error_return(-8, "inappropriate permissions on device!");
491 }
492 else
493 {
494 ftdi_error_return(-3, "unable to set usb configuration. Make sure the default FTDI driver is not in use");
495 }
496 }
497 }
498
499 if (libusb_claim_interface(ftdi->usb_dev, ftdi->interface) < 0)
500 {
501 ftdi_usb_close_internal (ftdi);
502 if(detach_errno == EPERM)
503 {
504 ftdi_error_return(-8, "inappropriate permissions on device!");
505 }
506 else
507 {
508 ftdi_error_return(-5, "unable to claim usb device. Make sure the default FTDI driver is not in use");
509 }
510 }
511
512 if (ftdi_usb_reset (ftdi) != 0)
513 {
514 ftdi_usb_close_internal (ftdi);
515 ftdi_error_return(-6, "ftdi_usb_reset failed");
516 }
517
518 // Try to guess chip type
519 // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0
520 if (desc.bcdDevice == 0x400 || (desc.bcdDevice == 0x200
521 && desc.iSerialNumber == 0))
522 ftdi->type = TYPE_BM;
523 else if (desc.bcdDevice == 0x200)
524 ftdi->type = TYPE_AM;
525 else if (desc.bcdDevice == 0x500)
526 ftdi->type = TYPE_2232C;
527 else if (desc.bcdDevice == 0x600)
528 ftdi->type = TYPE_R;
529 else if (desc.bcdDevice == 0x700)
530 ftdi->type = TYPE_2232H;
531 else if (desc.bcdDevice == 0x800)
532 ftdi->type = TYPE_4232H;
533
534 // Set default interface on dual/quad type chips
535 switch(ftdi->type)
536 {
537 case TYPE_2232C:
538 case TYPE_2232H:
539 case TYPE_4232H:
540 if (!ftdi->index)
541 ftdi->index = INTERFACE_A;
542 break;
543 default:
544 break;
545 }
546
547 // Determine maximum packet size
548 ftdi->max_packet_size = _ftdi_determine_max_packet_size(ftdi, dev);
549
550 if (ftdi_set_baudrate (ftdi, 9600) != 0)
551 {
552 ftdi_usb_close_internal (ftdi);
553 ftdi_error_return(-7, "set baudrate failed");
554 }
555
556 ftdi_error_return(0, "all fine");
557}
558
559/**
560 Opens the first device with a given vendor and product ids.
561
562 \param ftdi pointer to ftdi_context
563 \param vendor Vendor ID
564 \param product Product ID
565
566 \retval same as ftdi_usb_open_desc()
567*/
568int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product)
569{
570 return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL);
571}
572
573/**
574 Opens the first device with a given, vendor id, product id,
575 description and serial.
576
577 \param ftdi pointer to ftdi_context
578 \param vendor Vendor ID
579 \param product Product ID
580 \param description Description to search for. Use NULL if not needed.
581 \param serial Serial to search for. Use NULL if not needed.
582
583 \retval 0: all fine
584 \retval -3: usb device not found
585 \retval -4: unable to open device
586 \retval -5: unable to claim device
587 \retval -6: reset failed
588 \retval -7: set baudrate failed
589 \retval -8: get product description failed
590 \retval -9: get serial number failed
591 \retval -11: libusb_init() failed
592 \retval -12: libusb_get_device_list() failed
593 \retval -13: libusb_get_device_descriptor() failed
594*/
595int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
596 const char* description, const char* serial)
597{
598 return ftdi_usb_open_desc_index(ftdi,vendor,product,description,serial,0);
599}
600
601/**
602 Opens the index-th device with a given, vendor id, product id,
603 description and serial.
604
605 \param ftdi pointer to ftdi_context
606 \param vendor Vendor ID
607 \param product Product ID
608 \param description Description to search for. Use NULL if not needed.
609 \param serial Serial to search for. Use NULL if not needed.
610 \param index Number of matching device to open if there are more than one, starts with 0.
611
612 \retval 0: all fine
613 \retval -1: usb_find_busses() failed
614 \retval -2: usb_find_devices() failed
615 \retval -3: usb device not found
616 \retval -4: unable to open device
617 \retval -5: unable to claim device
618 \retval -6: reset failed
619 \retval -7: set baudrate failed
620 \retval -8: get product description failed
621 \retval -9: get serial number failed
622 \retval -10: unable to close device
623 \retval -11: ftdi context invalid
624*/
625int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
626 const char* description, const char* serial, unsigned int index)
627{
628 libusb_device *dev;
629 libusb_device **devs;
630 char string[256];
631 int i = 0;
632
633 if (libusb_init(&ftdi->usb_ctx) < 0)
634 ftdi_error_return(-11, "libusb_init() failed");
635
636 if (ftdi == NULL)
637 ftdi_error_return(-11, "ftdi context invalid");
638
639 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
640 ftdi_error_return(-12, "libusb_get_device_list() failed");
641
642 while ((dev = devs[i++]) != NULL)
643 {
644 struct libusb_device_descriptor desc;
645 int res;
646
647 if (libusb_get_device_descriptor(dev, &desc) < 0)
648 ftdi_error_return_free_device_list(-13, "libusb_get_device_descriptor() failed", devs);
649
650 if (desc.idVendor == vendor && desc.idProduct == product)
651 {
652 if (libusb_open(dev, &ftdi->usb_dev) < 0)
653 ftdi_error_return_free_device_list(-4, "usb_open() failed", devs);
654
655 if (description != NULL)
656 {
657 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)string, sizeof(string)) < 0)
658 {
659 libusb_close (ftdi->usb_dev);
660 ftdi_error_return_free_device_list(-8, "unable to fetch product description", devs);
661 }
662 if (strncmp(string, description, sizeof(string)) != 0)
663 {
664 libusb_close (ftdi->usb_dev);
665 continue;
666 }
667 }
668 if (serial != NULL)
669 {
670 if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)string, sizeof(string)) < 0)
671 {
672 ftdi_usb_close_internal (ftdi);
673 ftdi_error_return_free_device_list(-9, "unable to fetch serial number", devs);
674 }
675 if (strncmp(string, serial, sizeof(string)) != 0)
676 {
677 ftdi_usb_close_internal (ftdi);
678 continue;
679 }
680 }
681
682 ftdi_usb_close_internal (ftdi);
683
684 if (index > 0)
685 {
686 index--;
687 continue;
688 }
689
690 res = ftdi_usb_open_dev(ftdi, dev);
691 libusb_free_device_list(devs,1);
692 return res;
693 }
694 }
695
696 // device not found
697 ftdi_error_return_free_device_list(-3, "device not found", devs);
698}
699
700/**
701 Opens the ftdi-device described by a description-string.
702 Intended to be used for parsing a device-description given as commandline argument.
703
704 \param ftdi pointer to ftdi_context
705 \param description NULL-terminated description-string, using this format:
706 \li <tt>d:\<devicenode></tt> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/)
707 \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")
708 \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
709 \li <tt>s:\<vendor>:\<product>:\<serial></tt> first device with given vendor id, product id and serial string
710
711 \note The description format may be extended in later versions.
712
713 \retval 0: all fine
714 \retval -1: libusb_init() failed
715 \retval -2: libusb_get_device_list() failed
716 \retval -3: usb device not found
717 \retval -4: unable to open device
718 \retval -5: unable to claim device
719 \retval -6: reset failed
720 \retval -7: set baudrate failed
721 \retval -8: get product description failed
722 \retval -9: get serial number failed
723 \retval -10: unable to close device
724 \retval -11: illegal description format
725 \retval -12: ftdi context invalid
726*/
727int ftdi_usb_open_string(struct ftdi_context *ftdi, const char* description)
728{
729 if (ftdi == NULL)
730 ftdi_error_return(-12, "ftdi context invalid");
731
732 if (description[0] == 0 || description[1] != ':')
733 ftdi_error_return(-11, "illegal description format");
734
735 if (description[0] == 'd')
736 {
737 libusb_device *dev;
738 libusb_device **devs;
739 unsigned int bus_number, device_address;
740 int i = 0;
741
742 if (libusb_init (&ftdi->usb_ctx) < 0)
743 ftdi_error_return(-1, "libusb_init() failed");
744
745 if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
746 ftdi_error_return(-2, "libusb_get_device_list() failed");
747
748 /* XXX: This doesn't handle symlinks/odd paths/etc... */
749 if (sscanf (description + 2, "%u/%u", &bus_number, &device_address) != 2)
750 ftdi_error_return_free_device_list(-11, "illegal description format", devs);
751
752 while ((dev = devs[i++]) != NULL)
753 {
754 int ret;
755 if (bus_number == libusb_get_bus_number (dev)
756 && device_address == libusb_get_device_address (dev))
757 {
758 ret = ftdi_usb_open_dev(ftdi, dev);
759 libusb_free_device_list(devs,1);
760 return ret;
761 }
762 }
763
764 // device not found
765 ftdi_error_return_free_device_list(-3, "device not found", devs);
766 }
767 else if (description[0] == 'i' || description[0] == 's')
768 {
769 unsigned int vendor;
770 unsigned int product;
771 unsigned int index=0;
772 const char *serial=NULL;
773 const char *startp, *endp;
774
775 errno=0;
776 startp=description+2;
777 vendor=strtoul((char*)startp,(char**)&endp,0);
778 if (*endp != ':' || endp == startp || errno != 0)
779 ftdi_error_return(-11, "illegal description format");
780
781 startp=endp+1;
782 product=strtoul((char*)startp,(char**)&endp,0);
783 if (endp == startp || errno != 0)
784 ftdi_error_return(-11, "illegal description format");
785
786 if (description[0] == 'i' && *endp != 0)
787 {
788 /* optional index field in i-mode */
789 if (*endp != ':')
790 ftdi_error_return(-11, "illegal description format");
791
792 startp=endp+1;
793 index=strtoul((char*)startp,(char**)&endp,0);
794 if (*endp != 0 || endp == startp || errno != 0)
795 ftdi_error_return(-11, "illegal description format");
796 }
797 if (description[0] == 's')
798 {
799 if (*endp != ':')
800 ftdi_error_return(-11, "illegal description format");
801
802 /* rest of the description is the serial */
803 serial=endp+1;
804 }
805
806 return ftdi_usb_open_desc_index(ftdi, vendor, product, NULL, serial, index);
807 }
808 else
809 {
810 ftdi_error_return(-11, "illegal description format");
811 }
812}
813
814/**
815 Resets the ftdi device.
816
817 \param ftdi pointer to ftdi_context
818
819 \retval 0: all fine
820 \retval -1: FTDI reset failed
821 \retval -2: USB device unavailable
822*/
823int ftdi_usb_reset(struct ftdi_context *ftdi)
824{
825 if (ftdi == NULL || ftdi->usb_dev == NULL)
826 ftdi_error_return(-2, "USB device unavailable");
827
828 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
829 SIO_RESET_REQUEST, SIO_RESET_SIO,
830 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
831 ftdi_error_return(-1,"FTDI reset failed");
832
833 // Invalidate data in the readbuffer
834 ftdi->readbuffer_offset = 0;
835 ftdi->readbuffer_remaining = 0;
836
837 return 0;
838}
839
840/**
841 Clears the read buffer on the chip and the internal read buffer.
842
843 \param ftdi pointer to ftdi_context
844
845 \retval 0: all fine
846 \retval -1: read buffer purge failed
847 \retval -2: USB device unavailable
848*/
849int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi)
850{
851 if (ftdi == NULL || ftdi->usb_dev == NULL)
852 ftdi_error_return(-2, "USB device unavailable");
853
854 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
855 SIO_RESET_REQUEST, SIO_RESET_PURGE_RX,
856 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
857 ftdi_error_return(-1, "FTDI purge of RX buffer failed");
858
859 // Invalidate data in the readbuffer
860 ftdi->readbuffer_offset = 0;
861 ftdi->readbuffer_remaining = 0;
862
863 return 0;
864}
865
866/**
867 Clears the write buffer on the chip.
868
869 \param ftdi pointer to ftdi_context
870
871 \retval 0: all fine
872 \retval -1: write buffer purge failed
873 \retval -2: USB device unavailable
874*/
875int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi)
876{
877 if (ftdi == NULL || ftdi->usb_dev == NULL)
878 ftdi_error_return(-2, "USB device unavailable");
879
880 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
881 SIO_RESET_REQUEST, SIO_RESET_PURGE_TX,
882 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
883 ftdi_error_return(-1, "FTDI purge of TX buffer failed");
884
885 return 0;
886}
887
888/**
889 Clears the buffers on the chip and the internal read buffer.
890
891 \param ftdi pointer to ftdi_context
892
893 \retval 0: all fine
894 \retval -1: read buffer purge failed
895 \retval -2: write buffer purge failed
896 \retval -3: USB device unavailable
897*/
898int ftdi_usb_purge_buffers(struct ftdi_context *ftdi)
899{
900 int result;
901
902 if (ftdi == NULL || ftdi->usb_dev == NULL)
903 ftdi_error_return(-3, "USB device unavailable");
904
905 result = ftdi_usb_purge_rx_buffer(ftdi);
906 if (result < 0)
907 return -1;
908
909 result = ftdi_usb_purge_tx_buffer(ftdi);
910 if (result < 0)
911 return -2;
912
913 return 0;
914}
915
916
917
918/**
919 Closes the ftdi device. Call ftdi_deinit() if you're cleaning up.
920
921 \param ftdi pointer to ftdi_context
922
923 \retval 0: all fine
924 \retval -1: usb_release failed
925 \retval -3: ftdi context invalid
926*/
927int ftdi_usb_close(struct ftdi_context *ftdi)
928{
929 int rtn = 0;
930
931 if (ftdi == NULL)
932 ftdi_error_return(-3, "ftdi context invalid");
933
934 if (ftdi->usb_dev != NULL)
935 if (libusb_release_interface(ftdi->usb_dev, ftdi->interface) < 0)
936 rtn = -1;
937
938 ftdi_usb_close_internal (ftdi);
939
940 return rtn;
941}
942
943/**
944 ftdi_convert_baudrate returns nearest supported baud rate to that requested.
945 Function is only used internally
946 \internal
947*/
948static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi,
949 unsigned short *value, unsigned short *index)
950{
951 static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1};
952 static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3};
953 static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7};
954 int divisor, best_divisor, best_baud, best_baud_diff;
955 unsigned long encoded_divisor;
956 int i;
957
958 if (baudrate <= 0)
959 {
960 // Return error
961 return -1;
962 }
963
964 divisor = 24000000 / baudrate;
965
966 if (ftdi->type == TYPE_AM)
967 {
968 // Round down to supported fraction (AM only)
969 divisor -= am_adjust_dn[divisor & 7];
970 }
971
972 // Try this divisor and the one above it (because division rounds down)
973 best_divisor = 0;
974 best_baud = 0;
975 best_baud_diff = 0;
976 for (i = 0; i < 2; i++)
977 {
978 int try_divisor = divisor + i;
979 int baud_estimate;
980 int baud_diff;
981
982 // Round up to supported divisor value
983 if (try_divisor <= 8)
984 {
985 // Round up to minimum supported divisor
986 try_divisor = 8;
987 }
988 else if (ftdi->type != TYPE_AM && try_divisor < 12)
989 {
990 // BM doesn't support divisors 9 through 11 inclusive
991 try_divisor = 12;
992 }
993 else if (divisor < 16)
994 {
995 // AM doesn't support divisors 9 through 15 inclusive
996 try_divisor = 16;
997 }
998 else
999 {
1000 if (ftdi->type == TYPE_AM)
1001 {
1002 // Round up to supported fraction (AM only)
1003 try_divisor += am_adjust_up[try_divisor & 7];
1004 if (try_divisor > 0x1FFF8)
1005 {
1006 // Round down to maximum supported divisor value (for AM)
1007 try_divisor = 0x1FFF8;
1008 }
1009 }
1010 else
1011 {
1012 if (try_divisor > 0x1FFFF)
1013 {
1014 // Round down to maximum supported divisor value (for BM)
1015 try_divisor = 0x1FFFF;
1016 }
1017 }
1018 }
1019 // Get estimated baud rate (to nearest integer)
1020 baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor;
1021 // Get absolute difference from requested baud rate
1022 if (baud_estimate < baudrate)
1023 {
1024 baud_diff = baudrate - baud_estimate;
1025 }
1026 else
1027 {
1028 baud_diff = baud_estimate - baudrate;
1029 }
1030 if (i == 0 || baud_diff < best_baud_diff)
1031 {
1032 // Closest to requested baud rate so far
1033 best_divisor = try_divisor;
1034 best_baud = baud_estimate;
1035 best_baud_diff = baud_diff;
1036 if (baud_diff == 0)
1037 {
1038 // Spot on! No point trying
1039 break;
1040 }
1041 }
1042 }
1043 // Encode the best divisor value
1044 encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14);
1045 // Deal with special cases for encoded value
1046 if (encoded_divisor == 1)
1047 {
1048 encoded_divisor = 0; // 3000000 baud
1049 }
1050 else if (encoded_divisor == 0x4001)
1051 {
1052 encoded_divisor = 1; // 2000000 baud (BM only)
1053 }
1054 // Split into "value" and "index" values
1055 *value = (unsigned short)(encoded_divisor & 0xFFFF);
1056 if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H)
1057 {
1058 *index = (unsigned short)(encoded_divisor >> 8);
1059 *index &= 0xFF00;
1060 *index |= ftdi->index;
1061 }
1062 else
1063 *index = (unsigned short)(encoded_divisor >> 16);
1064
1065 // Return the nearest baud rate
1066 return best_baud;
1067}
1068
1069/**
1070 Sets the chip baud rate
1071
1072 \param ftdi pointer to ftdi_context
1073 \param baudrate baud rate to set
1074
1075 \retval 0: all fine
1076 \retval -1: invalid baudrate
1077 \retval -2: setting baudrate failed
1078 \retval -3: USB device unavailable
1079*/
1080int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate)
1081{
1082 unsigned short value, index;
1083 int actual_baudrate;
1084
1085 if (ftdi == NULL || ftdi->usb_dev == NULL)
1086 ftdi_error_return(-3, "USB device unavailable");
1087
1088 if (ftdi->bitbang_enabled)
1089 {
1090 baudrate = baudrate*4;
1091 }
1092
1093 actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index);
1094 if (actual_baudrate <= 0)
1095 ftdi_error_return (-1, "Silly baudrate <= 0.");
1096
1097 // Check within tolerance (about 5%)
1098 if ((actual_baudrate * 2 < baudrate /* Catch overflows */ )
1099 || ((actual_baudrate < baudrate)
1100 ? (actual_baudrate * 21 < baudrate * 20)
1101 : (baudrate * 21 < actual_baudrate * 20)))
1102 ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4");
1103
1104 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1105 SIO_SET_BAUDRATE_REQUEST, value,
1106 index, NULL, 0, ftdi->usb_write_timeout) < 0)
1107 ftdi_error_return (-2, "Setting new baudrate failed");
1108
1109 ftdi->baudrate = baudrate;
1110 return 0;
1111}
1112
1113/**
1114 Set (RS232) line characteristics.
1115 The break type can only be set via ftdi_set_line_property2()
1116 and defaults to "off".
1117
1118 \param ftdi pointer to ftdi_context
1119 \param bits Number of bits
1120 \param sbit Number of stop bits
1121 \param parity Parity mode
1122
1123 \retval 0: all fine
1124 \retval -1: Setting line property failed
1125*/
1126int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1127 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity)
1128{
1129 return ftdi_set_line_property2(ftdi, bits, sbit, parity, BREAK_OFF);
1130}
1131
1132/**
1133 Set (RS232) line characteristics
1134
1135 \param ftdi pointer to ftdi_context
1136 \param bits Number of bits
1137 \param sbit Number of stop bits
1138 \param parity Parity mode
1139 \param break_type Break type
1140
1141 \retval 0: all fine
1142 \retval -1: Setting line property failed
1143 \retval -2: USB device unavailable
1144*/
1145int ftdi_set_line_property2(struct ftdi_context *ftdi, enum ftdi_bits_type bits,
1146 enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity,
1147 enum ftdi_break_type break_type)
1148{
1149 unsigned short value = bits;
1150
1151 if (ftdi == NULL || ftdi->usb_dev == NULL)
1152 ftdi_error_return(-2, "USB device unavailable");
1153
1154 switch (parity)
1155 {
1156 case NONE:
1157 value |= (0x00 << 8);
1158 break;
1159 case ODD:
1160 value |= (0x01 << 8);
1161 break;
1162 case EVEN:
1163 value |= (0x02 << 8);
1164 break;
1165 case MARK:
1166 value |= (0x03 << 8);
1167 break;
1168 case SPACE:
1169 value |= (0x04 << 8);
1170 break;
1171 }
1172
1173 switch (sbit)
1174 {
1175 case STOP_BIT_1:
1176 value |= (0x00 << 11);
1177 break;
1178 case STOP_BIT_15:
1179 value |= (0x01 << 11);
1180 break;
1181 case STOP_BIT_2:
1182 value |= (0x02 << 11);
1183 break;
1184 }
1185
1186 switch (break_type)
1187 {
1188 case BREAK_OFF:
1189 value |= (0x00 << 14);
1190 break;
1191 case BREAK_ON:
1192 value |= (0x01 << 14);
1193 break;
1194 }
1195
1196 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1197 SIO_SET_DATA_REQUEST, value,
1198 ftdi->index, NULL, 0, ftdi->usb_write_timeout) < 0)
1199 ftdi_error_return (-1, "Setting new line property failed");
1200
1201 return 0;
1202}
1203
1204/**
1205 Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip
1206
1207 \param ftdi pointer to ftdi_context
1208 \param buf Buffer with the data
1209 \param size Size of the buffer
1210
1211 \retval -666: USB device unavailable
1212 \retval <0: error code from usb_bulk_write()
1213 \retval >0: number of bytes written
1214*/
1215int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1216{
1217 int offset = 0;
1218 int actual_length;
1219
1220 if (ftdi == NULL || ftdi->usb_dev == NULL)
1221 ftdi_error_return(-666, "USB device unavailable");
1222
1223 while (offset < size)
1224 {
1225 int write_size = ftdi->writebuffer_chunksize;
1226
1227 if (offset+write_size > size)
1228 write_size = size-offset;
1229
1230 if (libusb_bulk_transfer(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, &actual_length, ftdi->usb_write_timeout) < 0)
1231 ftdi_error_return(-1, "usb bulk write failed");
1232
1233 offset += actual_length;
1234 }
1235
1236 return offset;
1237}
1238
1239static void ftdi_read_data_cb(struct libusb_transfer *transfer)
1240{
1241 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1242 struct ftdi_context *ftdi = tc->ftdi;
1243 int packet_size, actual_length, num_of_chunks, chunk_remains, i, ret;
1244
1245 packet_size = ftdi->max_packet_size;
1246
1247 actual_length = transfer->actual_length;
1248
1249 if (actual_length > 2)
1250 {
1251 // skip FTDI status bytes.
1252 // Maybe stored in the future to enable modem use
1253 num_of_chunks = actual_length / packet_size;
1254 chunk_remains = actual_length % packet_size;
1255 //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);
1256
1257 ftdi->readbuffer_offset += 2;
1258 actual_length -= 2;
1259
1260 if (actual_length > packet_size - 2)
1261 {
1262 for (i = 1; i < num_of_chunks; i++)
1263 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1264 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1265 packet_size - 2);
1266 if (chunk_remains > 2)
1267 {
1268 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1269 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1270 chunk_remains-2);
1271 actual_length -= 2*num_of_chunks;
1272 }
1273 else
1274 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1275 }
1276
1277 if (actual_length > 0)
1278 {
1279 // data still fits in buf?
1280 if (tc->offset + actual_length <= tc->size)
1281 {
1282 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, actual_length);
1283 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1284 tc->offset += actual_length;
1285
1286 ftdi->readbuffer_offset = 0;
1287 ftdi->readbuffer_remaining = 0;
1288
1289 /* Did we read exactly the right amount of bytes? */
1290 if (tc->offset == tc->size)
1291 {
1292 //printf("read_data exact rem %d offset %d\n",
1293 //ftdi->readbuffer_remaining, offset);
1294 tc->completed = 1;
1295 return;
1296 }
1297 }
1298 else
1299 {
1300 // only copy part of the data or size <= readbuffer_chunksize
1301 int part_size = tc->size - tc->offset;
1302 memcpy (tc->buf + tc->offset, ftdi->readbuffer + ftdi->readbuffer_offset, part_size);
1303 tc->offset += part_size;
1304
1305 ftdi->readbuffer_offset += part_size;
1306 ftdi->readbuffer_remaining = actual_length - part_size;
1307
1308 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1309 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1310 tc->completed = 1;
1311 return;
1312 }
1313 }
1314 }
1315 ret = libusb_submit_transfer (transfer);
1316 if (ret < 0)
1317 tc->completed = 1;
1318}
1319
1320
1321static void ftdi_write_data_cb(struct libusb_transfer *transfer)
1322{
1323 struct ftdi_transfer_control *tc = (struct ftdi_transfer_control *) transfer->user_data;
1324 struct ftdi_context *ftdi = tc->ftdi;
1325
1326 tc->offset += transfer->actual_length;
1327
1328 if (tc->offset == tc->size)
1329 {
1330 tc->completed = 1;
1331 }
1332 else
1333 {
1334 int write_size = ftdi->writebuffer_chunksize;
1335 int ret;
1336
1337 if (tc->offset + write_size > tc->size)
1338 write_size = tc->size - tc->offset;
1339
1340 transfer->length = write_size;
1341 transfer->buffer = tc->buf + tc->offset;
1342 ret = libusb_submit_transfer (transfer);
1343 if (ret < 0)
1344 tc->completed = 1;
1345 }
1346}
1347
1348
1349/**
1350 Writes data to the chip. Does not wait for completion of the transfer
1351 nor does it make sure that the transfer was successful.
1352
1353 Use libusb 1.0 asynchronous API.
1354
1355 \param ftdi pointer to ftdi_context
1356 \param buf Buffer with the data
1357 \param size Size of the buffer
1358
1359 \retval NULL: Some error happens when submit transfer
1360 \retval !NULL: Pointer to a ftdi_transfer_control
1361*/
1362
1363struct ftdi_transfer_control *ftdi_write_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1364{
1365 struct ftdi_transfer_control *tc;
1366 struct libusb_transfer *transfer = libusb_alloc_transfer(0);
1367 int write_size, ret;
1368
1369 if (ftdi == NULL || ftdi->usb_dev == NULL)
1370 {
1371 libusb_free_transfer(transfer);
1372 return NULL;
1373 }
1374
1375 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1376
1377 if (!tc || !transfer)
1378 return NULL;
1379
1380 tc->ftdi = ftdi;
1381 tc->completed = 0;
1382 tc->buf = buf;
1383 tc->size = size;
1384 tc->offset = 0;
1385
1386 if (size < ftdi->writebuffer_chunksize)
1387 write_size = size;
1388 else
1389 write_size = ftdi->writebuffer_chunksize;
1390
1391 libusb_fill_bulk_transfer(transfer, ftdi->usb_dev, ftdi->in_ep, buf,
1392 write_size, ftdi_write_data_cb, tc,
1393 ftdi->usb_write_timeout);
1394 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1395
1396 ret = libusb_submit_transfer(transfer);
1397 if (ret < 0)
1398 {
1399 libusb_free_transfer(transfer);
1400 tc->completed = 1;
1401 tc->transfer = NULL;
1402 return NULL;
1403 }
1404 tc->transfer = transfer;
1405
1406 return tc;
1407}
1408
1409/**
1410 Reads data from the chip. Does not wait for completion of the transfer
1411 nor does it make sure that the transfer was successful.
1412
1413 Use libusb 1.0 asynchronous API.
1414
1415 \param ftdi pointer to ftdi_context
1416 \param buf Buffer with the data
1417 \param size Size of the buffer
1418
1419 \retval NULL: Some error happens when submit transfer
1420 \retval !NULL: Pointer to a ftdi_transfer_control
1421*/
1422
1423struct ftdi_transfer_control *ftdi_read_data_submit(struct ftdi_context *ftdi, unsigned char *buf, int size)
1424{
1425 struct ftdi_transfer_control *tc;
1426 struct libusb_transfer *transfer;
1427 int ret;
1428
1429 if (ftdi == NULL || ftdi->usb_dev == NULL)
1430 return NULL;
1431
1432 tc = (struct ftdi_transfer_control *) malloc (sizeof (*tc));
1433 if (!tc)
1434 return NULL;
1435
1436 tc->ftdi = ftdi;
1437 tc->buf = buf;
1438 tc->size = size;
1439
1440 if (size <= ftdi->readbuffer_remaining)
1441 {
1442 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1443
1444 // Fix offsets
1445 ftdi->readbuffer_remaining -= size;
1446 ftdi->readbuffer_offset += size;
1447
1448 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1449
1450 tc->completed = 1;
1451 tc->offset = size;
1452 tc->transfer = NULL;
1453 return tc;
1454 }
1455
1456 tc->completed = 0;
1457 if (ftdi->readbuffer_remaining != 0)
1458 {
1459 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1460
1461 tc->offset = ftdi->readbuffer_remaining;
1462 }
1463 else
1464 tc->offset = 0;
1465
1466 transfer = libusb_alloc_transfer(0);
1467 if (!transfer)
1468 {
1469 free (tc);
1470 return NULL;
1471 }
1472
1473 ftdi->readbuffer_remaining = 0;
1474 ftdi->readbuffer_offset = 0;
1475
1476 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);
1477 transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
1478
1479 ret = libusb_submit_transfer(transfer);
1480 if (ret < 0)
1481 {
1482 libusb_free_transfer(transfer);
1483 free (tc);
1484 return NULL;
1485 }
1486 tc->transfer = transfer;
1487
1488 return tc;
1489}
1490
1491/**
1492 Wait for completion of the transfer.
1493
1494 Use libusb 1.0 asynchronous API.
1495
1496 \param tc pointer to ftdi_transfer_control
1497
1498 \retval < 0: Some error happens
1499 \retval >= 0: Data size transferred
1500*/
1501
1502int ftdi_transfer_data_done(struct ftdi_transfer_control *tc)
1503{
1504 int ret;
1505
1506 while (!tc->completed)
1507 {
1508 ret = libusb_handle_events(tc->ftdi->usb_ctx);
1509 if (ret < 0)
1510 {
1511 if (ret == LIBUSB_ERROR_INTERRUPTED)
1512 continue;
1513 libusb_cancel_transfer(tc->transfer);
1514 while (!tc->completed)
1515 if (libusb_handle_events(tc->ftdi->usb_ctx) < 0)
1516 break;
1517 libusb_free_transfer(tc->transfer);
1518 free (tc);
1519 return ret;
1520 }
1521 }
1522
1523 ret = tc->offset;
1524 /**
1525 * tc->transfer could be NULL if "(size <= ftdi->readbuffer_remaining)"
1526 * at ftdi_read_data_submit(). Therefore, we need to check it here.
1527 **/
1528 if (tc->transfer)
1529 {
1530 if (tc->transfer->status != LIBUSB_TRANSFER_COMPLETED)
1531 ret = -1;
1532 libusb_free_transfer(tc->transfer);
1533 }
1534 free(tc);
1535 return ret;
1536}
1537
1538/**
1539 Configure write buffer chunk size.
1540 Default is 4096.
1541
1542 \param ftdi pointer to ftdi_context
1543 \param chunksize Chunk size
1544
1545 \retval 0: all fine
1546 \retval -1: ftdi context invalid
1547*/
1548int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1549{
1550 if (ftdi == NULL)
1551 ftdi_error_return(-1, "ftdi context invalid");
1552
1553 ftdi->writebuffer_chunksize = chunksize;
1554 return 0;
1555}
1556
1557/**
1558 Get write buffer chunk size.
1559
1560 \param ftdi pointer to ftdi_context
1561 \param chunksize Pointer to store chunk size in
1562
1563 \retval 0: all fine
1564 \retval -1: ftdi context invalid
1565*/
1566int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1567{
1568 if (ftdi == NULL)
1569 ftdi_error_return(-1, "ftdi context invalid");
1570
1571 *chunksize = ftdi->writebuffer_chunksize;
1572 return 0;
1573}
1574
1575/**
1576 Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip.
1577
1578 Automatically strips the two modem status bytes transfered during every read.
1579
1580 \param ftdi pointer to ftdi_context
1581 \param buf Buffer to store data in
1582 \param size Size of the buffer
1583
1584 \retval -666: USB device unavailable
1585 \retval <0: error code from libusb_bulk_transfer()
1586 \retval 0: no data was available
1587 \retval >0: number of bytes read
1588
1589*/
1590int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size)
1591{
1592 int offset = 0, ret, i, num_of_chunks, chunk_remains;
1593 int packet_size = ftdi->max_packet_size;
1594 int actual_length = 1;
1595
1596 if (ftdi == NULL || ftdi->usb_dev == NULL)
1597 ftdi_error_return(-666, "USB device unavailable");
1598
1599 // Packet size sanity check (avoid division by zero)
1600 if (packet_size == 0)
1601 ftdi_error_return(-1, "max_packet_size is bogus (zero)");
1602
1603 // everything we want is still in the readbuffer?
1604 if (size <= ftdi->readbuffer_remaining)
1605 {
1606 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size);
1607
1608 // Fix offsets
1609 ftdi->readbuffer_remaining -= size;
1610 ftdi->readbuffer_offset += size;
1611
1612 /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */
1613
1614 return size;
1615 }
1616 // something still in the readbuffer, but not enough to satisfy 'size'?
1617 if (ftdi->readbuffer_remaining != 0)
1618 {
1619 memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining);
1620
1621 // Fix offset
1622 offset += ftdi->readbuffer_remaining;
1623 }
1624 // do the actual USB read
1625 while (offset < size && actual_length > 0)
1626 {
1627 ftdi->readbuffer_remaining = 0;
1628 ftdi->readbuffer_offset = 0;
1629 /* returns how much received */
1630 ret = libusb_bulk_transfer (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, &actual_length, ftdi->usb_read_timeout);
1631 if (ret < 0)
1632 ftdi_error_return(ret, "usb bulk read failed");
1633
1634 if (actual_length > 2)
1635 {
1636 // skip FTDI status bytes.
1637 // Maybe stored in the future to enable modem use
1638 num_of_chunks = actual_length / packet_size;
1639 chunk_remains = actual_length % packet_size;
1640 //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);
1641
1642 ftdi->readbuffer_offset += 2;
1643 actual_length -= 2;
1644
1645 if (actual_length > packet_size - 2)
1646 {
1647 for (i = 1; i < num_of_chunks; i++)
1648 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1649 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1650 packet_size - 2);
1651 if (chunk_remains > 2)
1652 {
1653 memmove (ftdi->readbuffer+ftdi->readbuffer_offset+(packet_size - 2)*i,
1654 ftdi->readbuffer+ftdi->readbuffer_offset+packet_size*i,
1655 chunk_remains-2);
1656 actual_length -= 2*num_of_chunks;
1657 }
1658 else
1659 actual_length -= 2*(num_of_chunks-1)+chunk_remains;
1660 }
1661 }
1662 else if (actual_length <= 2)
1663 {
1664 // no more data to read?
1665 return offset;
1666 }
1667 if (actual_length > 0)
1668 {
1669 // data still fits in buf?
1670 if (offset+actual_length <= size)
1671 {
1672 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, actual_length);
1673 //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]);
1674 offset += actual_length;
1675
1676 /* Did we read exactly the right amount of bytes? */
1677 if (offset == size)
1678 //printf("read_data exact rem %d offset %d\n",
1679 //ftdi->readbuffer_remaining, offset);
1680 return offset;
1681 }
1682 else
1683 {
1684 // only copy part of the data or size <= readbuffer_chunksize
1685 int part_size = size-offset;
1686 memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size);
1687
1688 ftdi->readbuffer_offset += part_size;
1689 ftdi->readbuffer_remaining = actual_length-part_size;
1690 offset += part_size;
1691
1692 /* printf("Returning part: %d - size: %d - offset: %d - actual_length: %d - remaining: %d\n",
1693 part_size, size, offset, actual_length, ftdi->readbuffer_remaining); */
1694
1695 return offset;
1696 }
1697 }
1698 }
1699 // never reached
1700 return -127;
1701}
1702
1703/**
1704 Configure read buffer chunk size.
1705 Default is 4096.
1706
1707 Automatically reallocates the buffer.
1708
1709 \param ftdi pointer to ftdi_context
1710 \param chunksize Chunk size
1711
1712 \retval 0: all fine
1713 \retval -1: ftdi context invalid
1714*/
1715int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize)
1716{
1717 unsigned char *new_buf;
1718
1719 if (ftdi == NULL)
1720 ftdi_error_return(-1, "ftdi context invalid");
1721
1722 // Invalidate all remaining data
1723 ftdi->readbuffer_offset = 0;
1724 ftdi->readbuffer_remaining = 0;
1725#ifdef __linux__
1726 /* We can't set readbuffer_chunksize larger than MAX_BULK_BUFFER_LENGTH,
1727 which is defined in libusb-1.0. Otherwise, each USB read request will
1728 be divided into multiple URBs. This will cause issues on Linux kernel
1729 older than 2.6.32. */
1730 if (chunksize > 16384)
1731 chunksize = 16384;
1732#endif
1733
1734 if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL)
1735 ftdi_error_return(-1, "out of memory for readbuffer");
1736
1737 ftdi->readbuffer = new_buf;
1738 ftdi->readbuffer_chunksize = chunksize;
1739
1740 return 0;
1741}
1742
1743/**
1744 Get read buffer chunk size.
1745
1746 \param ftdi pointer to ftdi_context
1747 \param chunksize Pointer to store chunk size in
1748
1749 \retval 0: all fine
1750 \retval -1: FTDI context invalid
1751*/
1752int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize)
1753{
1754 if (ftdi == NULL)
1755 ftdi_error_return(-1, "FTDI context invalid");
1756
1757 *chunksize = ftdi->readbuffer_chunksize;
1758 return 0;
1759}
1760
1761
1762/**
1763 Enable bitbang mode.
1764
1765 \deprecated use \ref ftdi_set_bitmode with mode BITMODE_BITBANG instead
1766
1767 \param ftdi pointer to ftdi_context
1768 \param bitmask Bitmask to configure lines.
1769 HIGH/ON value configures a line as output.
1770
1771 \retval 0: all fine
1772 \retval -1: can't enable bitbang mode
1773 \retval -2: USB device unavailable
1774*/
1775int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask)
1776{
1777 unsigned short usb_val;
1778
1779 if (ftdi == NULL || ftdi->usb_dev == NULL)
1780 ftdi_error_return(-2, "USB device unavailable");
1781
1782 usb_val = bitmask; // low byte: bitmask
1783 /* FT2232C: Set bitbang_mode to 2 to enable SPI */
1784 usb_val |= (ftdi->bitbang_mode << 8);
1785
1786 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1787 SIO_SET_BITMODE_REQUEST, usb_val, ftdi->index,
1788 NULL, 0, ftdi->usb_write_timeout) < 0)
1789 ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?");
1790
1791 ftdi->bitbang_enabled = 1;
1792 return 0;
1793}
1794
1795/**
1796 Disable bitbang mode.
1797
1798 \param ftdi pointer to ftdi_context
1799
1800 \retval 0: all fine
1801 \retval -1: can't disable bitbang mode
1802 \retval -2: USB device unavailable
1803*/
1804int ftdi_disable_bitbang(struct ftdi_context *ftdi)
1805{
1806 if (ftdi == NULL || ftdi->usb_dev == NULL)
1807 ftdi_error_return(-2, "USB device unavailable");
1808
1809 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)
1810 ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?");
1811
1812 ftdi->bitbang_enabled = 0;
1813 return 0;
1814}
1815
1816/**
1817 Enable/disable bitbang modes.
1818
1819 \param ftdi pointer to ftdi_context
1820 \param bitmask Bitmask to configure lines.
1821 HIGH/ON value configures a line as output.
1822 \param mode Bitbang mode: use the values defined in \ref ftdi_mpsse_mode
1823
1824 \retval 0: all fine
1825 \retval -1: can't enable bitbang mode
1826 \retval -2: USB device unavailable
1827*/
1828int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode)
1829{
1830 unsigned short usb_val;
1831
1832 if (ftdi == NULL || ftdi->usb_dev == NULL)
1833 ftdi_error_return(-2, "USB device unavailable");
1834
1835 usb_val = bitmask; // low byte: bitmask
1836 usb_val |= (mode << 8);
1837 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)
1838 ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?");
1839
1840 ftdi->bitbang_mode = mode;
1841 ftdi->bitbang_enabled = (mode == BITMODE_RESET) ? 0 : 1;
1842 return 0;
1843}
1844
1845/**
1846 Directly read pin state, circumventing the read buffer. Useful for bitbang mode.
1847
1848 \param ftdi pointer to ftdi_context
1849 \param pins Pointer to store pins into
1850
1851 \retval 0: all fine
1852 \retval -1: read pins failed
1853 \retval -2: USB device unavailable
1854*/
1855int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins)
1856{
1857 if (ftdi == NULL || ftdi->usb_dev == NULL)
1858 ftdi_error_return(-2, "USB device unavailable");
1859
1860 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)
1861 ftdi_error_return(-1, "read pins failed");
1862
1863 return 0;
1864}
1865
1866/**
1867 Set latency timer
1868
1869 The FTDI chip keeps data in the internal buffer for a specific
1870 amount of time if the buffer is not full yet to decrease
1871 load on the usb bus.
1872
1873 \param ftdi pointer to ftdi_context
1874 \param latency Value between 1 and 255
1875
1876 \retval 0: all fine
1877 \retval -1: latency out of range
1878 \retval -2: unable to set latency timer
1879 \retval -3: USB device unavailable
1880*/
1881int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency)
1882{
1883 unsigned short usb_val;
1884
1885 if (latency < 1)
1886 ftdi_error_return(-1, "latency out of range. Only valid for 1-255");
1887
1888 if (ftdi == NULL || ftdi->usb_dev == NULL)
1889 ftdi_error_return(-3, "USB device unavailable");
1890
1891 usb_val = latency;
1892 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)
1893 ftdi_error_return(-2, "unable to set latency timer");
1894
1895 return 0;
1896}
1897
1898/**
1899 Get latency timer
1900
1901 \param ftdi pointer to ftdi_context
1902 \param latency Pointer to store latency value in
1903
1904 \retval 0: all fine
1905 \retval -1: unable to get latency timer
1906 \retval -2: USB device unavailable
1907*/
1908int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency)
1909{
1910 unsigned short usb_val;
1911
1912 if (ftdi == NULL || ftdi->usb_dev == NULL)
1913 ftdi_error_return(-2, "USB device unavailable");
1914
1915 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)
1916 ftdi_error_return(-1, "reading latency timer failed");
1917
1918 *latency = (unsigned char)usb_val;
1919 return 0;
1920}
1921
1922/**
1923 Poll modem status information
1924
1925 This function allows the retrieve the two status bytes of the device.
1926 The device sends these bytes also as a header for each read access
1927 where they are discarded by ftdi_read_data(). The chip generates
1928 the two stripped status bytes in the absence of data every 40 ms.
1929
1930 Layout of the first byte:
1931 - B0..B3 - must be 0
1932 - B4 Clear to send (CTS)
1933 0 = inactive
1934 1 = active
1935 - B5 Data set ready (DTS)
1936 0 = inactive
1937 1 = active
1938 - B6 Ring indicator (RI)
1939 0 = inactive
1940 1 = active
1941 - B7 Receive line signal detect (RLSD)
1942 0 = inactive
1943 1 = active
1944
1945 Layout of the second byte:
1946 - B0 Data ready (DR)
1947 - B1 Overrun error (OE)
1948 - B2 Parity error (PE)
1949 - B3 Framing error (FE)
1950 - B4 Break interrupt (BI)
1951 - B5 Transmitter holding register (THRE)
1952 - B6 Transmitter empty (TEMT)
1953 - B7 Error in RCVR FIFO
1954
1955 \param ftdi pointer to ftdi_context
1956 \param status Pointer to store status information in. Must be two bytes.
1957
1958 \retval 0: all fine
1959 \retval -1: unable to retrieve status information
1960 \retval -2: USB device unavailable
1961*/
1962int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status)
1963{
1964 char usb_val[2];
1965
1966 if (ftdi == NULL || ftdi->usb_dev == NULL)
1967 ftdi_error_return(-2, "USB device unavailable");
1968
1969 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)
1970 ftdi_error_return(-1, "getting modem status failed");
1971
1972 *status = (usb_val[1] << 8) | usb_val[0];
1973
1974 return 0;
1975}
1976
1977/**
1978 Set flowcontrol for ftdi chip
1979
1980 \param ftdi pointer to ftdi_context
1981 \param flowctrl flow control to use. should be
1982 SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS
1983
1984 \retval 0: all fine
1985 \retval -1: set flow control failed
1986 \retval -2: USB device unavailable
1987*/
1988int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl)
1989{
1990 if (ftdi == NULL || ftdi->usb_dev == NULL)
1991 ftdi_error_return(-2, "USB device unavailable");
1992
1993 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
1994 SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->index),
1995 NULL, 0, ftdi->usb_write_timeout) < 0)
1996 ftdi_error_return(-1, "set flow control failed");
1997
1998 return 0;
1999}
2000
2001/**
2002 Set dtr line
2003
2004 \param ftdi pointer to ftdi_context
2005 \param state state to set line to (1 or 0)
2006
2007 \retval 0: all fine
2008 \retval -1: set dtr failed
2009 \retval -2: USB device unavailable
2010*/
2011int ftdi_setdtr(struct ftdi_context *ftdi, int state)
2012{
2013 unsigned short usb_val;
2014
2015 if (ftdi == NULL || ftdi->usb_dev == NULL)
2016 ftdi_error_return(-2, "USB device unavailable");
2017
2018 if (state)
2019 usb_val = SIO_SET_DTR_HIGH;
2020 else
2021 usb_val = SIO_SET_DTR_LOW;
2022
2023 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2024 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2025 NULL, 0, ftdi->usb_write_timeout) < 0)
2026 ftdi_error_return(-1, "set dtr failed");
2027
2028 return 0;
2029}
2030
2031/**
2032 Set rts line
2033
2034 \param ftdi pointer to ftdi_context
2035 \param state state to set line to (1 or 0)
2036
2037 \retval 0: all fine
2038 \retval -1: set rts failed
2039 \retval -2: USB device unavailable
2040*/
2041int ftdi_setrts(struct ftdi_context *ftdi, int state)
2042{
2043 unsigned short usb_val;
2044
2045 if (ftdi == NULL || ftdi->usb_dev == NULL)
2046 ftdi_error_return(-2, "USB device unavailable");
2047
2048 if (state)
2049 usb_val = SIO_SET_RTS_HIGH;
2050 else
2051 usb_val = SIO_SET_RTS_LOW;
2052
2053 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2054 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2055 NULL, 0, ftdi->usb_write_timeout) < 0)
2056 ftdi_error_return(-1, "set of rts failed");
2057
2058 return 0;
2059}
2060
2061/**
2062 Set dtr and rts line in one pass
2063
2064 \param ftdi pointer to ftdi_context
2065 \param dtr DTR state to set line to (1 or 0)
2066 \param rts RTS state to set line to (1 or 0)
2067
2068 \retval 0: all fine
2069 \retval -1: set dtr/rts failed
2070 \retval -2: USB device unavailable
2071 */
2072int ftdi_setdtr_rts(struct ftdi_context *ftdi, int dtr, int rts)
2073{
2074 unsigned short usb_val;
2075
2076 if (ftdi == NULL || ftdi->usb_dev == NULL)
2077 ftdi_error_return(-2, "USB device unavailable");
2078
2079 if (dtr)
2080 usb_val = SIO_SET_DTR_HIGH;
2081 else
2082 usb_val = SIO_SET_DTR_LOW;
2083
2084 if (rts)
2085 usb_val |= SIO_SET_RTS_HIGH;
2086 else
2087 usb_val |= SIO_SET_RTS_LOW;
2088
2089 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2090 SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->index,
2091 NULL, 0, ftdi->usb_write_timeout) < 0)
2092 ftdi_error_return(-1, "set of rts/dtr failed");
2093
2094 return 0;
2095}
2096
2097/**
2098 Set the special event character
2099
2100 \param ftdi pointer to ftdi_context
2101 \param eventch Event character
2102 \param enable 0 to disable the event character, non-zero otherwise
2103
2104 \retval 0: all fine
2105 \retval -1: unable to set event character
2106 \retval -2: USB device unavailable
2107*/
2108int ftdi_set_event_char(struct ftdi_context *ftdi,
2109 unsigned char eventch, unsigned char enable)
2110{
2111 unsigned short usb_val;
2112
2113 if (ftdi == NULL || ftdi->usb_dev == NULL)
2114 ftdi_error_return(-2, "USB device unavailable");
2115
2116 usb_val = eventch;
2117 if (enable)
2118 usb_val |= 1 << 8;
2119
2120 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)
2121 ftdi_error_return(-1, "setting event character failed");
2122
2123 return 0;
2124}
2125
2126/**
2127 Set error character
2128
2129 \param ftdi pointer to ftdi_context
2130 \param errorch Error character
2131 \param enable 0 to disable the error character, non-zero otherwise
2132
2133 \retval 0: all fine
2134 \retval -1: unable to set error character
2135 \retval -2: USB device unavailable
2136*/
2137int ftdi_set_error_char(struct ftdi_context *ftdi,
2138 unsigned char errorch, unsigned char enable)
2139{
2140 unsigned short usb_val;
2141
2142 if (ftdi == NULL || ftdi->usb_dev == NULL)
2143 ftdi_error_return(-2, "USB device unavailable");
2144
2145 usb_val = errorch;
2146 if (enable)
2147 usb_val |= 1 << 8;
2148
2149 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)
2150 ftdi_error_return(-1, "setting error character failed");
2151
2152 return 0;
2153}
2154
2155/**
2156 Set the eeprom size
2157
2158 \param ftdi pointer to ftdi_context
2159 \param eeprom Pointer to ftdi_eeprom
2160 \param size
2161
2162*/
2163void ftdi_eeprom_setsize(struct ftdi_context *ftdi, struct ftdi_eeprom *eeprom, int size)
2164{
2165 if (ftdi == NULL)
2166 return;
2167
2168 ftdi->eeprom = eeprom;
2169 ftdi->eeprom->size=size;
2170}
2171
2172/**
2173 Init eeprom with default values.
2174
2175 \param eeprom Pointer to ftdi_eeprom
2176*/
2177void ftdi_eeprom_initdefaults(struct ftdi_context *ftdi)
2178{
2179 int i;
2180 struct ftdi_eeprom *eeprom;
2181
2182 if (ftdi == NULL)
2183 return;
2184
2185 if (ftdi->eeprom == NULL)
2186 return;
2187
2188 eeprom = ftdi->eeprom;
2189
2190 eeprom->vendor_id = 0x0403;
2191 eeprom->product_id = 0x6001;
2192
2193 eeprom->self_powered = 1;
2194 eeprom->remote_wakeup = 1;
2195 eeprom->release = 0;
2196
2197 eeprom->in_is_isochronous = 0;
2198 eeprom->out_is_isochronous = 0;
2199 eeprom->suspend_pull_downs = 0;
2200
2201 eeprom->use_serial = 0;
2202 eeprom->change_usb_version = 0;
2203 eeprom->usb_version = 0x0200;
2204 eeprom->max_power = 0;
2205
2206 eeprom->manufacturer = NULL;
2207 eeprom->product = NULL;
2208 eeprom->serial = NULL;
2209 for (i=0; i < 5; i++)
2210 {
2211 eeprom->cbus_function[i] = 0;
2212 }
2213 eeprom->high_current_a = 0;
2214 eeprom->invert = 0;
2215
2216 eeprom->size = FTDI_MAX_EEPROM_SIZE;
2217}
2218
2219/**
2220 Frees allocated memory in eeprom.
2221
2222 \param eeprom Pointer to ftdi_eeprom
2223*/
2224void ftdi_eeprom_free(struct ftdi_context *ftdi)
2225{
2226 if (!ftdi)
2227 return;
2228 if (ftdi->eeprom)
2229 {
2230 struct ftdi_eeprom *eeprom = ftdi->eeprom;
2231
2232 if (eeprom->manufacturer != 0) {
2233 free(eeprom->manufacturer);
2234 eeprom->manufacturer = 0;
2235 }
2236 if (eeprom->product != 0) {
2237 free(eeprom->product);
2238 eeprom->product = 0;
2239 }
2240 if (eeprom->serial != 0) {
2241 free(eeprom->serial);
2242 eeprom->serial = 0;
2243 }
2244 }
2245}
2246
2247/**
2248 Build binary output from ftdi_eeprom structure.
2249 Output is suitable for ftdi_write_eeprom().
2250
2251 \note This function doesn't handle FT2232x devices. Only FT232x.
2252 \param eeprom Pointer to ftdi_eeprom
2253 \param output Buffer of 128 bytes to store eeprom image to
2254
2255 \retval >0: free eeprom size
2256 \retval -1: eeprom size (128 bytes) exceeded by custom strings
2257 \retval -2: Invalid eeprom pointer
2258 \retval -3: Invalid cbus function setting
2259 \retval -4: Chip doesn't support invert
2260 \retval -5: Chip doesn't support high current drive
2261*/
2262int ftdi_eeprom_build(struct ftdi_context *ftdi, unsigned char *output)
2263{
2264 unsigned char i, j;
2265 unsigned short checksum, value;
2266 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2267 int size_check;
2268 const int cbus_max[5] = {13, 13, 13, 13, 9};
2269 struct ftdi_eeprom *eeprom;
2270
2271 if (ftdi == NULL)
2272 ftdi_error_return(-2,"No context");
2273 if (ftdi->eeprom == NULL)
2274 ftdi_error_return(-2,"No eeprom structure");
2275
2276 eeprom= ftdi->eeprom;
2277
2278 if (eeprom->manufacturer != NULL)
2279 manufacturer_size = strlen(eeprom->manufacturer);
2280 if (eeprom->product != NULL)
2281 product_size = strlen(eeprom->product);
2282 if (eeprom->serial != NULL)
2283 serial_size = strlen(eeprom->serial);
2284
2285 // highest allowed cbus value
2286 for (i = 0; i < 5; i++)
2287 {
2288 if ((eeprom->cbus_function[i] > cbus_max[i]) ||
2289 (eeprom->cbus_function[i] && ftdi->type != TYPE_R)) return -3;
2290 }
2291 if (ftdi->type != TYPE_R)
2292 {
2293 if (eeprom->invert) return -4;
2294 if (eeprom->high_current_a) return -5;
2295 }
2296
2297 size_check = eeprom->size;
2298 size_check -= 28; // 28 are always in use (fixed)
2299
2300 // Top half of a 256byte eeprom is used just for strings and checksum
2301 // it seems that the FTDI chip will not read these strings from the lower half
2302 // Each string starts with two bytes; offset and type (0x03 for string)
2303 // the checksum needs two bytes, so without the string data that 8 bytes from the top half
2304 if (eeprom->size>=256) size_check = 120;
2305 size_check -= manufacturer_size*2;
2306 size_check -= product_size*2;
2307 size_check -= serial_size*2;
2308
2309 // eeprom size exceeded?
2310 if (size_check < 0)
2311 return (-1);
2312
2313 // empty eeprom
2314 memset (output, 0, eeprom->size);
2315
2316 // Addr 00: High current IO
2317 output[0x00] = eeprom->high_current_a ? HIGH_CURRENT_DRIVE : 0;
2318 // Addr 01: IN endpoint size (for R type devices, different for FT2232)
2319 if (ftdi->type == TYPE_R) {
2320 output[0x01] = 0x40;
2321 }
2322 // Addr 02: Vendor ID
2323 output[0x02] = eeprom->vendor_id;
2324 output[0x03] = eeprom->vendor_id >> 8;
2325
2326 // Addr 04: Product ID
2327 output[0x04] = eeprom->product_id;
2328 output[0x05] = eeprom->product_id >> 8;
2329
2330 // Addr 06: Device release number (0400h for BM features)
2331 output[0x06] = 0x00;
2332 switch (eeprom->release) {
2333 case TYPE_AM:
2334 output[0x07] = 0x02;
2335 break;
2336 case TYPE_BM:
2337 output[0x07] = 0x04;
2338 break;
2339 case TYPE_2232C:
2340 output[0x07] = 0x05;
2341 break;
2342 case TYPE_R:
2343 output[0x07] = 0x06;
2344 break;
2345 default:
2346 output[0x07] = 0x00;
2347 }
2348
2349 // Addr 08: Config descriptor
2350 // Bit 7: always 1
2351 // Bit 6: 1 if this device is self powered, 0 if bus powered
2352 // Bit 5: 1 if this device uses remote wakeup
2353 // Bit 4: 1 if this device is battery powered
2354 j = 0x80;
2355 if (eeprom->self_powered == 1)
2356 j |= 0x40;
2357 if (eeprom->remote_wakeup == 1)
2358 j |= 0x20;
2359 output[0x08] = j;
2360
2361 // Addr 09: Max power consumption: max power = value * 2 mA
2362 output[0x09] = eeprom->max_power;
2363
2364 // Addr 0A: Chip configuration
2365 // Bit 7: 0 - reserved
2366 // Bit 6: 0 - reserved
2367 // Bit 5: 0 - reserved
2368 // Bit 4: 1 - Change USB version
2369 // Bit 3: 1 - Use the serial number string
2370 // Bit 2: 1 - Enable suspend pull downs for lower power
2371 // Bit 1: 1 - Out EndPoint is Isochronous
2372 // Bit 0: 1 - In EndPoint is Isochronous
2373 //
2374 j = 0;
2375 if (eeprom->in_is_isochronous == 1)
2376 j = j | 1;
2377 if (eeprom->out_is_isochronous == 1)
2378 j = j | 2;
2379 if (eeprom->suspend_pull_downs == 1)
2380 j = j | 4;
2381 if (eeprom->use_serial == 1)
2382 j = j | 8;
2383 if (eeprom->change_usb_version == 1)
2384 j = j | 16;
2385 output[0x0A] = j;
2386
2387 // Addr 0B: Invert data lines
2388 output[0x0B] = eeprom->invert & 0xff;
2389
2390 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2391 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2392 if (eeprom->change_usb_version == 1)
2393 {
2394 output[0x0C] = eeprom->usb_version;
2395 output[0x0D] = eeprom->usb_version >> 8;
2396 }
2397
2398
2399 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2400 // Addr 0F: Length of manufacturer string
2401 output[0x0F] = manufacturer_size*2 + 2;
2402
2403 // Addr 10: Offset of the product string + 0x80, calculated later
2404 // Addr 11: Length of product string
2405 output[0x11] = product_size*2 + 2;
2406
2407 // Addr 12: Offset of the serial string + 0x80, calculated later
2408 // Addr 13: Length of serial string
2409 output[0x13] = serial_size*2 + 2;
2410
2411 // Addr 14: CBUS function: CBUS0, CBUS1
2412 // Addr 15: CBUS function: CBUS2, CBUS3
2413 // Addr 16: CBUS function: CBUS5
2414 output[0x14] = eeprom->cbus_function[0] | (eeprom->cbus_function[1] << 4);
2415 output[0x15] = eeprom->cbus_function[2] | (eeprom->cbus_function[3] << 4);
2416 output[0x16] = eeprom->cbus_function[4];
2417 // Addr 17: Unknown
2418
2419 // Dynamic content
2420 // In images produced by FTDI's FT_Prog for FT232R strings start at 0x18
2421 // Space till 0x18 should be considered as reserved.
2422 if (ftdi->type >= TYPE_R) {
2423 i = 0x18;
2424 } else {
2425 i = 0x14;
2426 }
2427 if (eeprom->size >= 256) i = 0x80;
2428
2429
2430 // Output manufacturer
2431 output[0x0E] = i | 0x80; // calculate offset
2432 output[i++] = manufacturer_size*2 + 2;
2433 output[i++] = 0x03; // type: string
2434 for (j = 0; j < manufacturer_size; j++)
2435 {
2436 output[i] = eeprom->manufacturer[j], i++;
2437 output[i] = 0x00, i++;
2438 }
2439
2440 // Output product name
2441 output[0x10] = i | 0x80; // calculate offset
2442 output[i] = product_size*2 + 2, i++;
2443 output[i] = 0x03, i++;
2444 for (j = 0; j < product_size; j++)
2445 {
2446 output[i] = eeprom->product[j], i++;
2447 output[i] = 0x00, i++;
2448 }
2449
2450 // Output serial
2451 output[0x12] = i | 0x80; // calculate offset
2452 output[i] = serial_size*2 + 2, i++;
2453 output[i] = 0x03, i++;
2454 for (j = 0; j < serial_size; j++)
2455 {
2456 output[i] = eeprom->serial[j], i++;
2457 output[i] = 0x00, i++;
2458 }
2459
2460 // calculate checksum
2461 checksum = 0xAAAA;
2462
2463 for (i = 0; i < eeprom->size/2-1; i++)
2464 {
2465 value = output[i*2];
2466 value += output[(i*2)+1] << 8;
2467
2468 checksum = value^checksum;
2469 checksum = (checksum << 1) | (checksum >> 15);
2470 }
2471
2472 output[eeprom->size-2] = checksum;
2473 output[eeprom->size-1] = checksum >> 8;
2474
2475 return size_check;
2476}
2477
2478/**
2479 Decode binary EEPROM image into an ftdi_eeprom structure.
2480
2481 \param eeprom Pointer to ftdi_eeprom which will be filled in.
2482 \param buf Buffer of \a size bytes of raw eeprom data
2483 \param size size size of eeprom data in bytes
2484
2485 \retval 0: all fine
2486 \retval -1: something went wrong
2487
2488 FIXME: How to pass size? How to handle size field in ftdi_eeprom?
2489 FIXME: Strings are malloc'ed here and should be freed somewhere
2490*/
2491int ftdi_eeprom_decode(struct ftdi_context *ftdi, unsigned char *buf, int size, int verbose)
2492{
2493 unsigned char i, j;
2494 unsigned short checksum, eeprom_checksum, value;
2495 unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0;
2496 int eeprom_size;
2497 struct ftdi_eeprom *eeprom;
2498
2499 if (ftdi == NULL)
2500 ftdi_error_return(-1,"No context");
2501 if (ftdi->eeprom == NULL)
2502 ftdi_error_return(-1,"No eeprom");
2503
2504 eeprom_size = ftdi->eeprom->size;
2505 if(ftdi->type == TYPE_R)
2506 eeprom_size = 0x80;
2507 eeprom = ftdi->eeprom;
2508
2509 // Addr 00: Channel A setting
2510
2511 eeprom->channel_a_type = buf[0x00] & 0x7;
2512 eeprom->channel_a_driver = buf[0x00] & DRIVER_VCP;
2513 eeprom->high_current_a = buf[0x00] & HIGH_CURRENT_DRIVE;
2514
2515 // Addr 01: Channel B setting
2516
2517 eeprom->channel_b_type = buf[0x01] & 0x7;
2518 eeprom->channel_b_driver = buf[0x01] & DRIVER_VCP;
2519 eeprom->high_current_b = buf[0x01] & HIGH_CURRENT_DRIVE;
2520
2521 eeprom->suspend_dbus7 = buf[0x01] & SUSPEND_DBUS7;
2522
2523 // Addr 02: Vendor ID
2524 eeprom->vendor_id = buf[0x02] + (buf[0x03] << 8);
2525
2526 // Addr 04: Product ID
2527 eeprom->product_id = buf[0x04] + (buf[0x05] << 8);
2528
2529 eeprom->release = buf[0x06] + (buf[0x07]<<8);
2530
2531 // Addr 08: Config descriptor
2532 // Bit 7: always 1
2533 // Bit 6: 1 if this device is self powered, 0 if bus powered
2534 // Bit 5: 1 if this device uses remote wakeup
2535 // Bit 4: 1 if this device is battery powered
2536 eeprom->self_powered = buf[0x08] & 0x40;
2537 eeprom->remote_wakeup = buf[0x08] & 0x20;;
2538
2539 // Addr 09: Max power consumption: max power = value * 2 mA
2540 eeprom->max_power = buf[0x09];
2541
2542 // Addr 0A: Chip configuration
2543 // Bit 7: 0 - reserved
2544 // Bit 6: 0 - reserved
2545 // Bit 5: 0 - reserved
2546 // Bit 4: 1 - Change USB version
2547 // Not seen on FT2232(D)
2548 // Bit 3: 1 - Use the serial number string
2549 // Bit 2: 1 - Enable suspend pull downs for lower power
2550 // Bit 1: 1 - Out EndPoint is Isochronous
2551 // Bit 0: 1 - In EndPoint is Isochronous
2552 //
2553 eeprom->in_is_isochronous = buf[0x0A]&0x01;
2554 eeprom->out_is_isochronous = buf[0x0A]&0x02;
2555 eeprom->suspend_pull_downs = buf[0x0A]&0x04;
2556 eeprom->use_serial = buf[0x0A]&0x08;
2557 eeprom->change_usb_version = buf[0x0A]&0x10;
2558
2559
2560 // Addr 0C: USB version low byte when 0x0A bit 4 is set
2561 // Addr 0D: USB version high byte when 0x0A bit 4 is set
2562 if ((eeprom->change_usb_version == 1) || ftdi->type == TYPE_2232C)
2563 {
2564 eeprom->usb_version = buf[0x0C] + (buf[0x0D] << 8);
2565 }
2566
2567 // Addr 0E: Offset of the manufacturer string + 0x80, calculated later
2568 // Addr 0F: Length of manufacturer string
2569 manufacturer_size = buf[0x0F]/2;
2570 if (manufacturer_size > 0)
2571 {
2572 eeprom->manufacturer = malloc(manufacturer_size);
2573 if (eeprom->manufacturer)
2574 {
2575 // Decode manufacturer
2576 i = buf[0x0E] & (eeprom_size -1); // offset
2577 for (j=0;j<manufacturer_size-1;j++)
2578 {
2579 eeprom->manufacturer[j] = buf[2*j+i+2];
2580 }
2581 eeprom->manufacturer[j] = '\0';
2582 }
2583 }
2584 else eeprom->manufacturer = NULL;
2585
2586 // Addr 10: Offset of the product string + 0x80, calculated later
2587 // Addr 11: Length of product string
2588 product_size = buf[0x11]/2;
2589 if (product_size > 0)
2590 {
2591 eeprom->product = malloc(product_size);
2592 if(eeprom->product)
2593 {
2594 // Decode product name
2595 i = buf[0x10] & (eeprom_size -1); // offset
2596 for (j=0;j<product_size-1;j++)
2597 {
2598 eeprom->product[j] = buf[2*j+i+2];
2599 }
2600 eeprom->product[j] = '\0';
2601 }
2602 }
2603 else eeprom->product = NULL;
2604
2605 // Addr 12: Offset of the serial string + 0x80, calculated later
2606 // Addr 13: Length of serial string
2607 serial_size = buf[0x13]/2;
2608 if (serial_size > 0)
2609 {
2610 eeprom->serial = malloc(serial_size);
2611 if(eeprom->serial)
2612 {
2613 // Decode serial
2614 i = buf[0x12] & (eeprom_size -1); // offset
2615 for (j=0;j<serial_size-1;j++)
2616 {
2617 eeprom->serial[j] = buf[2*j+i+2];
2618 }
2619 eeprom->serial[j] = '\0';
2620 }
2621 }
2622 else eeprom->serial = NULL;
2623
2624 // verify checksum
2625 checksum = 0xAAAA;
2626
2627 for (i = 0; i < eeprom_size/2-1; i++)
2628 {
2629 value = buf[i*2];
2630 value += buf[(i*2)+1] << 8;
2631
2632 checksum = value^checksum;
2633 checksum = (checksum << 1) | (checksum >> 15);
2634 }
2635
2636 eeprom_checksum = buf[eeprom_size-2] + (buf[eeprom_size-1] << 8);
2637
2638 if (eeprom_checksum != checksum)
2639 {
2640 fprintf(stderr, "Checksum Error: %04x %04x\n", checksum, eeprom_checksum);
2641 ftdi_error_return(-1,"EEPROM checksum error");
2642 }
2643
2644 else if ((ftdi->type == TYPE_AM) || (ftdi->type == TYPE_BM))
2645 {
2646 eeprom->chip = buf[14];
2647 }
2648 else if(ftdi->type == TYPE_2232C)
2649 {
2650 eeprom->chip = buf[14];
2651 }
2652 else if(ftdi->type == TYPE_R)
2653 {
2654 // Addr 0B: Invert data lines
2655 // Works only on FT232R, not FT245R, but no way to distinguish
2656 eeprom->invert = buf[0x0B];
2657 // Addr 14: CBUS function: CBUS0, CBUS1
2658 // Addr 15: CBUS function: CBUS2, CBUS3
2659 // Addr 16: CBUS function: CBUS5
2660 eeprom->cbus_function[0] = buf[0x14] & 0x0f;
2661 eeprom->cbus_function[1] = (buf[0x14] >> 4) & 0x0f;
2662 eeprom->cbus_function[2] = buf[0x15] & 0x0f;
2663 eeprom->cbus_function[3] = (buf[0x15] >> 4) & 0x0f;
2664 eeprom->cbus_function[4] = buf[0x16] & 0x0f;
2665 }
2666 else if ((ftdi->type == TYPE_2232H) ||(ftdi->type == TYPE_4232H))
2667 {
2668 eeprom->group0_drive = buf[0x0c] & DRIVE_16MA;
2669 eeprom->group0_schmitt = buf[0x0c] & IS_SCHMITT;
2670 eeprom->group0_slew = buf[0x0c] & SLOW_SLEW;
2671 eeprom->group1_drive = (buf[0x0c] >> 4) & 0x3;
2672 eeprom->group1_schmitt = (buf[0x0c] >> 4) & IS_SCHMITT;
2673 eeprom->group1_slew = (buf[0x0c] >> 4) & SLOW_SLEW;
2674 eeprom->group2_drive = buf[0x0d] & DRIVE_16MA;
2675 eeprom->group2_schmitt = buf[0x0d] & IS_SCHMITT;
2676 eeprom->group2_slew = buf[0x0d] & SLOW_SLEW;
2677 eeprom->group3_drive = (buf[0x0d] >> 4) & DRIVE_16MA;
2678 eeprom->group3_schmitt = (buf[0x0d] >> 4) & IS_SCHMITT;
2679 eeprom->group3_slew = (buf[0x0d] >> 4) & SLOW_SLEW;
2680 }
2681
2682 if(verbose)
2683 {
2684 char *channel_mode[] = {"UART","245","CPU", "unknown", "OPTO"};
2685 fprintf(stdout, "VID: 0x%04x\n",eeprom->vendor_id);
2686 fprintf(stdout, "PID: 0x%04x\n",eeprom->product_id);
2687 fprintf(stdout, "Release: 0x%04x\n",eeprom->release);
2688
2689 if(eeprom->self_powered)
2690 fprintf(stdout, "Self-Powered%s", (eeprom->remote_wakeup)?", USB Remote Wake Up\n":"\n");
2691 else
2692 fprintf(stdout, "Bus Powered: %3d mA%s", eeprom->max_power*2,
2693 (eeprom->remote_wakeup)?" USB Remote Wake Up\n":"\n");
2694 if(eeprom->manufacturer)
2695 fprintf(stdout, "Manufacturer: %s\n",eeprom->manufacturer);
2696 if(eeprom->product)
2697 fprintf(stdout, "Product: %s\n",eeprom->product);
2698 if(eeprom->serial)
2699 fprintf(stdout, "Serial: %s\n",eeprom->serial);
2700 fprintf(stdout, "Checksum : %04x\n", checksum);
2701 if (ftdi->type >= TYPE_2232C)
2702 fprintf(stdout,"Channel A has Mode %s%s%s\n",
2703 channel_mode[eeprom->channel_a_type],
2704 (eeprom->channel_a_driver)?" VCP":"",
2705 (eeprom->high_current_a)?" High Currenr IO":"");
2706 if (ftdi->type == TYPE_2232C)
2707 fprintf(stdout,"Channel B has Mode %s%s%s\n",
2708 channel_mode[eeprom->channel_b_type],
2709 (eeprom->channel_b_driver)?" VCP":"",
2710 (eeprom->high_current_b)?" High Currenr IO":"");
2711 if ((ftdi->type == TYPE_2232H) || (ftdi->type == TYPE_4232H))
2712 {
2713 fprintf(stdout,"%s has %d mA drive%s%s\n",
2714 (ftdi->type == TYPE_2232H)?"AL":"A",
2715 (eeprom->group0_drive+1) *4,
2716 (eeprom->group0_schmitt)?" Schmitt Input":"",
2717 (eeprom->group0_slew)?" Slow Slew":"");
2718 fprintf(stdout,"%s has %d mA drive%s%s\n",
2719 (ftdi->type == TYPE_2232H)?"AH":"B",
2720 (eeprom->group1_drive+1) *4,
2721 (eeprom->group1_schmitt)?" Schmitt Input":"",
2722 (eeprom->group1_slew)?" Slow Slew":"");
2723 fprintf(stdout,"%s has %d mA drive%s%s\n",
2724 (ftdi->type == TYPE_2232H)?"BL":"C",
2725 (eeprom->group2_drive+1) *4,
2726 (eeprom->group2_schmitt)?" Schmitt Input":"",
2727 (eeprom->group2_slew)?" Slow Slew":"");
2728 fprintf(stdout,"%s has %d mA drive%s%s\n",
2729 (ftdi->type == TYPE_2232H)?"BH":"D",
2730 (eeprom->group3_drive+1) *4,
2731 (eeprom->group3_schmitt)?" Schmitt Input":"",
2732 (eeprom->group3_slew)?" Slow Slew":"");
2733 }
2734
2735 }
2736
2737 return 0;
2738}
2739
2740/**
2741 Read eeprom location
2742
2743 \param ftdi pointer to ftdi_context
2744 \param eeprom_addr Address of eeprom location to be read
2745 \param eeprom_val Pointer to store read eeprom location
2746
2747 \retval 0: all fine
2748 \retval -1: read failed
2749 \retval -2: USB device unavailable
2750*/
2751int ftdi_read_eeprom_location (struct ftdi_context *ftdi, int eeprom_addr, unsigned short *eeprom_val)
2752{
2753 if (ftdi == NULL || ftdi->usb_dev == NULL)
2754 ftdi_error_return(-2, "USB device unavailable");
2755
2756 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)
2757 ftdi_error_return(-1, "reading eeprom failed");
2758
2759 return 0;
2760}
2761
2762/**
2763 Read eeprom
2764
2765 \param ftdi pointer to ftdi_context
2766 \param eeprom Pointer to store eeprom into
2767
2768 \retval 0: all fine
2769 \retval -1: read failed
2770 \retval -2: USB device unavailable
2771*/
2772int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2773{
2774 int i;
2775
2776 if (ftdi == NULL || ftdi->usb_dev == NULL)
2777 ftdi_error_return(-2, "USB device unavailable");
2778
2779 for (i = 0; i < FTDI_MAX_EEPROM_SIZE/2; i++)
2780 {
2781 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
2782 ftdi_error_return(-1, "reading eeprom failed");
2783 }
2784
2785 if (ftdi->type == TYPE_R)
2786 ftdi->eeprom->size = 0xa0;
2787 /* Guesses size of eeprom by comparing halves
2788 - will not work with blank eeprom */
2789 else if (strrchr((const char *)eeprom, 0xff) == ((const char *)eeprom +FTDI_MAX_EEPROM_SIZE -1))
2790 ftdi->eeprom->size = -1;
2791 else if(memcmp(eeprom,&eeprom[0x80],0x80) == 0)
2792 ftdi->eeprom->size = 0x80;
2793 else if(memcmp(eeprom,&eeprom[0x40],0x40) == 0)
2794 ftdi->eeprom->size = 0x40;
2795 else
2796 ftdi->eeprom->size = 0x100;
2797 return 0;
2798}
2799
2800/*
2801 ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID
2802 Function is only used internally
2803 \internal
2804*/
2805static unsigned char ftdi_read_chipid_shift(unsigned char value)
2806{
2807 return ((value & 1) << 1) |
2808 ((value & 2) << 5) |
2809 ((value & 4) >> 2) |
2810 ((value & 8) << 4) |
2811 ((value & 16) >> 1) |
2812 ((value & 32) >> 1) |
2813 ((value & 64) >> 4) |
2814 ((value & 128) >> 2);
2815}
2816
2817/**
2818 Read the FTDIChip-ID from R-type devices
2819
2820 \param ftdi pointer to ftdi_context
2821 \param chipid Pointer to store FTDIChip-ID
2822
2823 \retval 0: all fine
2824 \retval -1: read failed
2825 \retval -2: USB device unavailable
2826*/
2827int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
2828{
2829 unsigned int a = 0, b = 0;
2830
2831 if (ftdi == NULL || ftdi->usb_dev == NULL)
2832 ftdi_error_return(-2, "USB device unavailable");
2833
2834 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)
2835 {
2836 a = a << 8 | a >> 8;
2837 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)
2838 {
2839 b = b << 8 | b >> 8;
2840 a = (a << 16) | (b & 0xFFFF);
2841 a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8
2842 | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24;
2843 *chipid = a ^ 0xa5f0f7d1;
2844 return 0;
2845 }
2846 }
2847
2848 ftdi_error_return(-1, "read of FTDIChip-ID failed");
2849}
2850
2851/**
2852 Write eeprom location
2853
2854 \param ftdi pointer to ftdi_context
2855 \param eeprom_addr Address of eeprom location to be written
2856 \param eeprom_val Value to be written
2857
2858 \retval 0: all fine
2859 \retval -1: read failed
2860 \retval -2: USB device unavailable
2861*/
2862int ftdi_write_eeprom_location(struct ftdi_context *ftdi, int eeprom_addr, unsigned short eeprom_val)
2863{
2864 if (ftdi == NULL || ftdi->usb_dev == NULL)
2865 ftdi_error_return(-2, "USB device unavailable");
2866
2867 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2868 SIO_WRITE_EEPROM_REQUEST, eeprom_val, eeprom_addr,
2869 NULL, 0, ftdi->usb_write_timeout) != 0)
2870 ftdi_error_return(-1, "unable to write eeprom");
2871
2872 return 0;
2873}
2874
2875/**
2876 Write eeprom
2877
2878 \param ftdi pointer to ftdi_context
2879 \param eeprom Pointer to read eeprom from
2880
2881 \retval 0: all fine
2882 \retval -1: read failed
2883 \retval -2: USB device unavailable
2884*/
2885int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
2886{
2887 unsigned short usb_val, status;
2888 int i, ret;
2889
2890 if (ftdi == NULL || ftdi->usb_dev == NULL)
2891 ftdi_error_return(-2, "USB device unavailable");
2892
2893 /* These commands were traced while running MProg */
2894 if ((ret = ftdi_usb_reset(ftdi)) != 0)
2895 return ret;
2896 if ((ret = ftdi_poll_modem_status(ftdi, &status)) != 0)
2897 return ret;
2898 if ((ret = ftdi_set_latency_timer(ftdi, 0x77)) != 0)
2899 return ret;
2900
2901 for (i = 0; i < ftdi->eeprom->size/2; i++)
2902 {
2903 usb_val = eeprom[i*2];
2904 usb_val += eeprom[(i*2)+1] << 8;
2905 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
2906 SIO_WRITE_EEPROM_REQUEST, usb_val, i,
2907 NULL, 0, ftdi->usb_write_timeout) < 0)
2908 ftdi_error_return(-1, "unable to write eeprom");
2909 }
2910
2911 return 0;
2912}
2913
2914/**
2915 Erase eeprom
2916
2917 This is not supported on FT232R/FT245R according to the MProg manual from FTDI.
2918
2919 \param ftdi pointer to ftdi_context
2920
2921 \retval 0: all fine
2922 \retval -1: erase failed
2923 \retval -2: USB device unavailable
2924*/
2925int ftdi_erase_eeprom(struct ftdi_context *ftdi)
2926{
2927 if (ftdi == NULL || ftdi->usb_dev == NULL)
2928 ftdi_error_return(-2, "USB device unavailable");
2929
2930 if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_ERASE_EEPROM_REQUEST, 0, 0, NULL, 0, ftdi->usb_write_timeout) < 0)
2931 ftdi_error_return(-1, "unable to erase eeprom");
2932
2933 return 0;
2934}
2935
2936/**
2937 Get string representation for last error code
2938
2939 \param ftdi pointer to ftdi_context
2940
2941 \retval Pointer to error string
2942*/
2943char *ftdi_get_error_string (struct ftdi_context *ftdi)
2944{
2945 if (ftdi == NULL)
2946 return "";
2947
2948 return ftdi->error_str;
2949}
2950
2951/* @} end of doxygen libftdi group */
A library to talk to FTDI chips