1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
|
/*
* avrftdi - extension for avrdude, Wolfgang Moser, Ville Voipio
* Copyright (C) 2011 Hannes Weisbach, Doug Springer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* $Id: avrftdi.c 1373 2016-02-15 20:29:53Z joerg_wunsch $ */
/*
* Interface to the MPSSE Engine of FTDI Chips using libftdi.
*/
#include "ac_cfg.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdint.h>
#include <stdarg.h>
#include "avrdude.h"
#include "libavrdude.h"
#include "avrftdi.h"
#include "avrftdi_tpi.h"
#include "avrftdi_private.h"
#include "usbdevs.h"
#ifndef MAX
#define MAX(a,b) ((a)>(b)?(a):(b))
#endif
#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif
#ifdef DO_NOT_BUILD_AVRFTDI
static int avrftdi_noftdi_open (struct programmer_t *pgm, char * name)
{
avrdude_message(MSG_INFO, "%s: Error: no libftdi or libusb support. Install libftdi1/libusb-1.0 or libftdi/libusb and run configure/make again.\n",
progname);
return -1;
}
void avrftdi_initpgm(PROGRAMMER * pgm)
{
strcpy(pgm->type, "avrftdi");
pgm->open = avrftdi_noftdi_open;
}
#else
enum { FTDI_SCK = 0, FTDI_MOSI, FTDI_MISO, FTDI_RESET };
static int write_flush(avrftdi_t *);
/*
* returns a human-readable name for a pin number. the name should match with
* the pin names used in FTDI datasheets.
*/
static char*
ftdi_pin_name(avrftdi_t* pdata, struct pindef_t pin)
{
static char str[128];
char interface = '@';
/* INTERFACE_ANY is zero, so @ is used
* INTERFACE_A is one, so '@' + 1 = 'A'
* and so forth ...
* be aware, there is an 'interface' member in ftdi_context,
* however, we really want the 'index' member here.
*/
interface += pdata->ftdic->index;
int pinno;
int n = 0;
int mask = pin.mask[0];
const char * fmt;
str[0] = 0;
for(pinno = 0; mask; mask >>= 1, pinno++) {
if(!(mask & 1))
continue;
int chars = 0;
char port;
/* This is FTDI's naming scheme.
* probably 'D' is for data and 'C' for control
*/
if(pinno < 8)
port = 'D';
else
port = 'C';
if(str[0] == 0)
fmt = "%c%cBUS%d%n";
else
fmt = ", %c%cBUS%d%n";
snprintf(&str[n], sizeof(str) - n, fmt, interface, port, pinno, &chars);
n += chars;
}
return str;
}
/*
* output function, to save if(vebose>level)-constructs. also prefixes output
* with "avrftdi function-name(line-number):" to identify were messages came
* from.
* This function is the backend of the log_*-macros, but it can be used
* directly.
*/
void avrftdi_log(int level, const char * func, int line,
const char * fmt, ...) {
static int skip_prefix = 0;
const char *p = fmt;
va_list ap;
if(verbose >= level)
{
if(!skip_prefix)
{
switch(level) {
case ERR: avrdude_message(MSG_INFO, "E "); break;
case WARN: avrdude_message(MSG_INFO, "W "); break;
case INFO: avrdude_message(MSG_INFO, "I "); break;
case DEBUG: avrdude_message(MSG_INFO, "D "); break;
case TRACE: avrdude_message(MSG_INFO, "T "); break;
default: avrdude_message(MSG_INFO, " "); break;
}
avrdude_message(MSG_INFO, "%s(%d): ", func, line);
}
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
skip_prefix = 1;
while(*p++)
if(*p == '\n' && !(*(p+1)))
skip_prefix = 0;
}
/*
* helper function to print a binary buffer *buf of size len. begin and end of
* the dump are enclosed in the string contained in *desc. offset denotes the
* number of bytes which are printed on the first line (may be 0). after that
* width bytes are printed on each line
*/
static void buf_dump(const unsigned char *buf, int len, char *desc,
int offset, int width)
{
int i;
avrdude_message(MSG_INFO, "%s begin:\n", desc);
for (i = 0; i < offset; i++)
avrdude_message(MSG_INFO, "%02x ", buf[i]);
avrdude_message(MSG_INFO, "\n");
for (i++; i <= len; i++) {
avrdude_message(MSG_INFO, "%02x ", buf[i-1]);
if((i-offset) != 0 && (i-offset)%width == 0)
avrdude_message(MSG_INFO, "\n");
}
avrdude_message(MSG_INFO, "%s end\n", desc);
}
/*
* calculates the so-called 'divisor'-value from a given frequency.
* the divisor is sent to the chip.
*/
static int set_frequency(avrftdi_t* ftdi, uint32_t freq)
{
int32_t divisor;
uint8_t buf[3];
/* divisor on 6000000 / freq - 1 */
divisor = (6000000 / freq) - 1;
if (divisor < 0) {
log_warn("Frequency too high (%u > 6 MHz)\n", freq);
log_warn("Resetting Frequency to 6MHz\n");
divisor = 0;
}
if (divisor > 65535) {
log_warn("Frequency too low (%u < 91.553 Hz)\n", freq);
log_warn("Resetting Frequency to 91.553Hz\n");
divisor = 65535;
}
log_info("Using frequency: %d\n", 6000000/(divisor+1));
log_info("Clock divisor: 0x%04x\n", divisor);
buf[0] = TCK_DIVISOR;
buf[1] = (uint8_t)(divisor & 0xff);
buf[2] = (uint8_t)((divisor >> 8) & 0xff);
E(ftdi_write_data(ftdi->ftdic, buf, 3) < 0, ftdi->ftdic);
return 0;
}
/*
* This function sets or clears any pin, except SCK, MISO and MOSI. Depending
* on the pin configuration, a non-zero value sets the pin in the 'active'
* state (high active, low active) and a zero value sets the pin in the
* inactive state.
* Because we configured the pin direction mask earlier, nothing bad can happen
* here.
*/
static int set_pin(PROGRAMMER * pgm, int pinfunc, int value)
{
avrftdi_t* pdata = to_pdata(pgm);
struct pindef_t pin = pgm->pin[pinfunc];
if (pin.mask[0] == 0) {
// ignore not defined pins (might be the led or vcc or buff if not needed)
return 0;
}
log_debug("Setting pin %s (%s) as %s: %s (%s active)\n",
pinmask_to_str(pin.mask), ftdi_pin_name(pdata, pin),
avr_pin_name(pinfunc),
(value) ? "high" : "low", (pin.inverse[0]) ? "low" : "high");
pdata->pin_value = SET_BITS_0(pdata->pin_value, pgm, pinfunc, value);
return write_flush(pdata);
}
/*
* Mandatory callbacks which boil down to GPIO.
*/
static int set_led_pgm(struct programmer_t * pgm, int value)
{
return set_pin(pgm, PIN_LED_PGM, value);
}
static int set_led_rdy(struct programmer_t * pgm, int value)
{
return set_pin(pgm, PIN_LED_RDY, value);
}
static int set_led_err(struct programmer_t * pgm, int value)
{
return set_pin(pgm, PIN_LED_ERR, value);
}
static int set_led_vfy(struct programmer_t * pgm, int value)
{
return set_pin(pgm, PIN_LED_VFY, value);
}
static void avrftdi_enable(PROGRAMMER * pgm)
{
set_pin(pgm, PPI_AVR_BUFF, ON);
}
static void avrftdi_disable(PROGRAMMER * pgm)
{
set_pin(pgm, PPI_AVR_BUFF, OFF);
}
static void avrftdi_powerup(PROGRAMMER * pgm)
{
set_pin(pgm, PPI_AVR_VCC, ON);
}
static void avrftdi_powerdown(PROGRAMMER * pgm)
{
set_pin(pgm, PPI_AVR_VCC, OFF);
}
static inline int set_data(PROGRAMMER * pgm, unsigned char *buf, unsigned char data, bool read_data) {
int j;
int buf_pos = 0;
unsigned char bit = 0x80;
avrftdi_t* pdata = to_pdata(pgm);
for (j=0; j<8; j++) {
pdata->pin_value = SET_BITS_0(pdata->pin_value,pgm,PIN_AVR_MOSI,data & bit);
pdata->pin_value = SET_BITS_0(pdata->pin_value,pgm,PIN_AVR_SCK,0);
buf[buf_pos++] = SET_BITS_LOW;
buf[buf_pos++] = (pdata->pin_value) & 0xff;
buf[buf_pos++] = (pdata->pin_direction) & 0xff;
buf[buf_pos++] = SET_BITS_HIGH;
buf[buf_pos++] = ((pdata->pin_value) >> 8) & 0xff;
buf[buf_pos++] = ((pdata->pin_direction) >> 8) & 0xff;
pdata->pin_value = SET_BITS_0(pdata->pin_value,pgm,PIN_AVR_SCK,1);
buf[buf_pos++] = SET_BITS_LOW;
buf[buf_pos++] = (pdata->pin_value) & 0xff;
buf[buf_pos++] = (pdata->pin_direction) & 0xff;
buf[buf_pos++] = SET_BITS_HIGH;
buf[buf_pos++] = ((pdata->pin_value) >> 8) & 0xff;
buf[buf_pos++] = ((pdata->pin_direction) >> 8) & 0xff;
if (read_data) {
buf[buf_pos++] = GET_BITS_LOW;
buf[buf_pos++] = GET_BITS_HIGH;
}
bit >>= 1;
}
return buf_pos;
}
static inline unsigned char extract_data(PROGRAMMER * pgm, unsigned char *buf, int offset) {
int j;
unsigned char bit = 0x80;
unsigned char r = 0;
buf += offset * 16; // 2 bytes per bit, 8 bits
for (j=0; j<8; j++) {
uint16_t in = buf[0] | (buf[1] << 8);
if (GET_BITS_0(in,pgm,PIN_AVR_MISO)) {
r |= bit;
}
buf += 2; // 2 bytes per input
bit >>= 1;
}
return r;
}
static int avrftdi_transmit_bb(PROGRAMMER * pgm, unsigned char mode, const unsigned char *buf,
unsigned char *data, int buf_size)
{
size_t remaining = buf_size;
size_t written = 0;
avrftdi_t* pdata = to_pdata(pgm);
size_t blocksize = pdata->rx_buffer_size/2; // we are reading 2 bytes per data byte
// determine a maximum size of data block
size_t max_size = MIN(pdata->ftdic->max_packet_size,pdata->tx_buffer_size);
// select block size so that resulting commands does not exceed max_size if possible
blocksize = MAX(1,(max_size-7)/((8*2*6)+(8*1*2)));
//avrdude_message(MSG_INFO, "blocksize %d \n",blocksize);
while(remaining)
{
size_t transfer_size = (remaining > blocksize) ? blocksize : remaining;
// (8*2) outputs per data byte, 6 transmit bytes per output (SET_BITS_LOW/HIGH),
// (8*1) inputs per data byte, 2 transmit bytes per input (GET_BITS_LOW/HIGH),
// 1x SEND_IMMEDIATE
unsigned char send_buffer[(8*2*6)*transfer_size+(8*1*2)*transfer_size+7];
int len = 0;
int i;
for(i = 0 ; i< transfer_size; i++) {
len += set_data(pgm, send_buffer + len, buf[written+i], (mode & MPSSE_DO_READ) != 0);
}
pdata->pin_value = SET_BITS_0(pdata->pin_value,pgm,PIN_AVR_SCK,0);
send_buffer[len++] = SET_BITS_LOW;
send_buffer[len++] = (pdata->pin_value) & 0xff;
send_buffer[len++] = (pdata->pin_direction) & 0xff;
send_buffer[len++] = SET_BITS_HIGH;
send_buffer[len++] = ((pdata->pin_value) >> 8) & 0xff;
send_buffer[len++] = ((pdata->pin_direction) >> 8) & 0xff;
send_buffer[len++] = SEND_IMMEDIATE;
E(ftdi_write_data(pdata->ftdic, send_buffer, len) != len, pdata->ftdic);
if (mode & MPSSE_DO_READ) {
unsigned char recv_buffer[2*16*transfer_size];
int n;
int k = 0;
do {
n = ftdi_read_data(pdata->ftdic, &recv_buffer[k], 2*16*transfer_size - k);
E(n < 0, pdata->ftdic);
k += n;
} while (k < transfer_size);
for(i = 0 ; i< transfer_size; i++) {
data[written + i] = extract_data(pgm, recv_buffer, i);
}
}
written += transfer_size;
remaining -= transfer_size;
}
return written;
}
/* Send 'buf_size' bytes from 'cmd' to device and return data from device in
* buffer 'data'.
* Write is only performed when mode contains MPSSE_DO_WRITE.
* Read is only performed when mode contains MPSSE_DO_WRITE and MPSSE_DO_READ.
*/
static int avrftdi_transmit_mpsse(avrftdi_t* pdata, unsigned char mode, const unsigned char *buf,
unsigned char *data, int buf_size)
{
size_t blocksize;
size_t remaining = buf_size;
size_t written = 0;
unsigned char cmd[3];
// unsigned char si = SEND_IMMEDIATE;
cmd[0] = mode | MPSSE_WRITE_NEG;
cmd[1] = ((buf_size - 1) & 0xff);
cmd[2] = (((buf_size - 1) >> 8) & 0xff);
//if we are not reading back, we can just write the data out
if(!(mode & MPSSE_DO_READ))
blocksize = buf_size;
else
blocksize = pdata->rx_buffer_size;
E(ftdi_write_data(pdata->ftdic, cmd, sizeof(cmd)) != sizeof(cmd), pdata->ftdic);
while(remaining)
{
size_t transfer_size = (remaining > blocksize) ? blocksize : remaining;
E(ftdi_write_data(pdata->ftdic, (unsigned char*)&buf[written], transfer_size) != transfer_size, pdata->ftdic);
#if 0
if(remaining < blocksize)
E(ftdi_write_data(pdata->ftdic, &si, sizeof(si)) != sizeof(si), pdata->ftdic);
#endif
if (mode & MPSSE_DO_READ) {
int n;
int k = 0;
do {
n = ftdi_read_data(pdata->ftdic, &data[written + k], transfer_size - k);
E(n < 0, pdata->ftdic);
k += n;
} while (k < transfer_size);
}
written += transfer_size;
remaining -= transfer_size;
}
return written;
}
static inline int avrftdi_transmit(PROGRAMMER * pgm, unsigned char mode, const unsigned char *buf,
unsigned char *data, int buf_size)
{
avrftdi_t* pdata = to_pdata(pgm);
if (pdata->use_bitbanging)
return avrftdi_transmit_bb(pgm, mode, buf, data, buf_size);
else
return avrftdi_transmit_mpsse(pdata, mode, buf, data, buf_size);
}
static int write_flush(avrftdi_t* pdata)
{
unsigned char buf[6];
log_debug("Setting pin direction (0x%04x) and value (0x%04x)\n",
pdata->pin_direction, pdata->pin_value);
buf[0] = SET_BITS_LOW;
buf[1] = (pdata->pin_value) & 0xff;
buf[2] = (pdata->pin_direction) & 0xff;
buf[3] = SET_BITS_HIGH;
buf[4] = ((pdata->pin_value) >> 8) & 0xff;
buf[5] = ((pdata->pin_direction) >> 8) & 0xff;
E(ftdi_write_data(pdata->ftdic, buf, 6) != 6, pdata->ftdic);
log_trace("Set pins command: %02x %02x %02x %02x %02x %02x\n",
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
/* we need to flush here, because set_pin is used as reset.
* if we want to sleep reset periods, we must be certain the
* avr has got the reset signal when we start sleeping.
* (it may be stuck in the USB stack or some USB hub)
*
* Add.: purge does NOT flush. It clears. Also, it is unknown, when the purge
* command actually arrives at the chip.
* Use read pin status command as sync.
*/
//E(ftdi_usb_purge_buffers(pdata->ftdic), pdata->ftdic);
unsigned char cmd[] = { GET_BITS_LOW, SEND_IMMEDIATE };
E(ftdi_write_data(pdata->ftdic, cmd, sizeof(cmd)) != sizeof(cmd), pdata->ftdic);
int num = 0;
do
{
int n = ftdi_read_data(pdata->ftdic, buf, sizeof(buf));
if(n > 0)
num += n;
E(n < 0, pdata->ftdic);
} while(num < 1);
if(num > 1)
log_warn("Read %d extra bytes\n", num-1);
return 0;
}
static int avrftdi_check_pins_bb(PROGRAMMER * pgm, bool output)
{
int pin;
/* pin checklist. */
struct pin_checklist_t pin_checklist[N_PINS];
avrftdi_t* pdata = to_pdata(pgm);
/* value for 8/12/16 bit wide interface */
int valid_mask = ((1 << pdata->pin_limit) - 1);
log_debug("Using valid mask bibanging: 0x%08x\n", valid_mask);
static struct pindef_t valid_pins;
valid_pins.mask[0] = valid_mask;
valid_pins.inverse[0] = valid_mask ;
/* build pin checklist */
for(pin = 0; pin < N_PINS; ++pin) {
pin_checklist[pin].pinname = pin;
pin_checklist[pin].mandatory = 0;
pin_checklist[pin].valid_pins = &valid_pins;
}
/* assumes all checklists above have same number of entries */
return pins_check(pgm, pin_checklist, N_PINS, output);
}
static int avrftdi_check_pins_mpsse(PROGRAMMER * pgm, bool output)
{
int pin;
/* pin checklist. */
struct pin_checklist_t pin_checklist[N_PINS];
avrftdi_t* pdata = to_pdata(pgm);
/* SCK/MOSI/MISO are fixed and not invertable?*/
/* TODO: inverted SCK/MISO/MOSI */
static const struct pindef_t valid_pins_SCK = {{0x01},{0x00}} ;
static const struct pindef_t valid_pins_MOSI = {{0x02},{0x00}} ;
static const struct pindef_t valid_pins_MISO = {{0x04},{0x00}} ;
/* value for 8/12/16 bit wide interface for other pins */
int valid_mask = ((1 << pdata->pin_limit) - 1);
/* mask out SCK/MISO/MOSI */
valid_mask &= ~((1 << FTDI_SCK) | (1 << FTDI_MOSI) | (1 << FTDI_MISO));
log_debug("Using valid mask mpsse: 0x%08x\n", valid_mask);
static struct pindef_t valid_pins_others;
valid_pins_others.mask[0] = valid_mask;
valid_pins_others.inverse[0] = valid_mask ;
/* build pin checklist */
for(pin = 0; pin < N_PINS; ++pin) {
pin_checklist[pin].pinname = pin;
pin_checklist[pin].mandatory = 0;
pin_checklist[pin].valid_pins = &valid_pins_others;
}
/* now set mpsse specific pins */
pin_checklist[PIN_AVR_SCK].mandatory = 1;
pin_checklist[PIN_AVR_SCK].valid_pins = &valid_pins_SCK;
pin_checklist[PIN_AVR_MOSI].mandatory = 1;
pin_checklist[PIN_AVR_MOSI].valid_pins = &valid_pins_MOSI;
pin_checklist[PIN_AVR_MISO].mandatory = 1;
pin_checklist[PIN_AVR_MISO].valid_pins = &valid_pins_MISO;
pin_checklist[PIN_AVR_RESET].mandatory = 1;
/* assumes all checklists above have same number of entries */
return pins_check(pgm, pin_checklist, N_PINS, output);
}
static int avrftdi_pin_setup(PROGRAMMER * pgm)
{
int pin;
/*************
* pin setup *
*************/
avrftdi_t* pdata = to_pdata(pgm);
bool pin_check_mpsse = (0 == avrftdi_check_pins_mpsse(pgm, verbose>3));
bool pin_check_bitbanging = (0 == avrftdi_check_pins_bb(pgm, verbose>3));
if (!pin_check_mpsse && !pin_check_bitbanging) {
log_err("No valid pin configuration found.\n");
avrftdi_check_pins_bb(pgm, true);
log_err("Pin configuration for FTDI MPSSE must be:\n");
log_err("%s: 0, %s: 1, %s: 2 (is: %s, %s, %s)\n", avr_pin_name(PIN_AVR_SCK),
avr_pin_name(PIN_AVR_MOSI), avr_pin_name(PIN_AVR_MISO),
pins_to_str(&pgm->pin[PIN_AVR_SCK]),
pins_to_str(&pgm->pin[PIN_AVR_MOSI]),
pins_to_str(&pgm->pin[PIN_AVR_MISO]));
log_err("If other pin configuration is used, fallback to slower bitbanging mode is used.\n");
return -1;
}
pdata->use_bitbanging = !pin_check_mpsse;
if (pdata->use_bitbanging) log_info("Because of pin configuration fallback to bitbanging mode.\n");
/*
* TODO: No need to fail for a wrongly configured led or something.
* Maybe we should only fail for SCK; MISO, MOSI, RST (and probably
* VCC and BUFF).
*/
/* everything is an output, except MISO */
for(pin = 0; pin < N_PINS; ++pin) {
pdata->pin_direction |= pgm->pin[pin].mask[0];
pdata->pin_value = SET_BITS_0(pdata->pin_value, pgm, pin, OFF);
}
pdata->pin_direction &= ~pgm->pin[PIN_AVR_MISO].mask[0];
for(pin = PIN_LED_ERR; pin < N_PINS; ++pin) {
pdata->led_mask |= pgm->pin[pin].mask[0];
}
log_info("Pin direction mask: %04x\n", pdata->pin_direction);
log_info("Pin value mask: %04x\n", pdata->pin_value);
return 0;
}
static int avrftdi_open(PROGRAMMER * pgm, char *port)
{
int vid, pid, interface, index, err;
char * serial, *desc;
avrftdi_t* pdata = to_pdata(pgm);
/************************
* parameter validation *
************************/
/* use vid/pid in following priority: config,
* defaults. cmd-line is currently not supported */
if (pgm->usbvid)
vid = pgm->usbvid;
else
vid = USB_VENDOR_FTDI;
LNODEID usbpid = lfirst(pgm->usbpid);
if (usbpid) {
pid = *(int *)(ldata(usbpid));
if (lnext(usbpid))
avrdude_message(MSG_INFO, "%s: Warning: using PID 0x%04x, ignoring remaining PIDs in list\n",
progname, pid);
} else
pid = USB_DEVICE_FT2232;
if (0 == pgm->usbsn[0]) /* we don't care about SN. Use first avail. */
serial = NULL;
else
serial = pgm->usbsn;
/* not used yet, but i put them here, just in case someone does needs or
* wants to implement this.
*/
desc = NULL;
index = 0;
if (pgm->usbdev[0] == 'a' || pgm->usbdev[0] == 'A')
interface = INTERFACE_A;
else if (pgm->usbdev[0] == 'b' || pgm->usbdev[0] == 'B')
interface = INTERFACE_B;
else {
log_warn("Invalid interface '%s'. Setting to Interface A\n", pgm->usbdev);
interface = INTERFACE_A;
}
/****************
* Device setup *
****************/
E(ftdi_set_interface(pdata->ftdic, interface) < 0, pdata->ftdic);
err = ftdi_usb_open_desc_index(pdata->ftdic, vid, pid, desc, serial, index);
if(err) {
log_err("Error %d occurred: %s\n", err, ftdi_get_error_string(pdata->ftdic));
//stupid hack, because avrdude calls pgm->close() even when pgm->open() fails
//and usb_dev is intialized to the last usb device from probing
pdata->ftdic->usb_dev = NULL;
return err;
} else {
log_info("Using device VID:PID %04x:%04x and SN '%s' on interface %c.\n",
vid, pid, serial, INTERFACE_A == interface? 'A': 'B');
}
ftdi_set_latency_timer(pdata->ftdic, 1);
//ftdi_write_data_set_chunksize(pdata->ftdic, 16);
//ftdi_read_data_set_chunksize(pdata->ftdic, 16);
/* set SPI mode */
E(ftdi_set_bitmode(pdata->ftdic, 0, BITMODE_RESET) < 0, pdata->ftdic);
E(ftdi_set_bitmode(pdata->ftdic, pdata->pin_direction & 0xff, BITMODE_MPSSE) < 0, pdata->ftdic);
E(ftdi_usb_purge_buffers(pdata->ftdic), pdata->ftdic);
write_flush(pdata);
if (pgm->baudrate) {
set_frequency(pdata, pgm->baudrate);
} else if(pgm->bitclock) {
set_frequency(pdata, (uint32_t)(1.0f/pgm->bitclock));
} else {
set_frequency(pdata, pgm->baudrate ? pgm->baudrate : 150000);
}
/* set pin limit depending on chip type */
switch(pdata->ftdic->type) {
case TYPE_AM:
case TYPE_BM:
case TYPE_R:
log_err("Found unsupported device type AM, BM or R. avrftdi ");
log_err("cannot work with your chip. Try the 'synbb' programmer.\n");
return -1;
case TYPE_2232C:
pdata->pin_limit = 12;
pdata->rx_buffer_size = 384;
pdata->tx_buffer_size = 128;
break;
case TYPE_2232H:
pdata->pin_limit = 16;
pdata->rx_buffer_size = 4096;
pdata->tx_buffer_size = 4096;
break;
#ifdef HAVE_LIBFTDI_TYPE_232H
case TYPE_232H:
pdata->pin_limit = 16;
pdata->rx_buffer_size = 1024;
pdata->tx_buffer_size = 1024;
break;
#else
#warning No support for 232H, use a newer libftdi, version >= 0.20
#endif
case TYPE_4232H:
pdata->pin_limit = 8;
pdata->rx_buffer_size = 2048;
pdata->tx_buffer_size = 2048;
break;
default:
log_warn("Found unknown device %x. I will do my ", pdata->ftdic->type);
log_warn("best to work with it, but no guarantees ...\n");
pdata->pin_limit = 8;
pdata->rx_buffer_size = pdata->ftdic->max_packet_size;
pdata->tx_buffer_size = pdata->ftdic->max_packet_size;
break;
}
if(avrftdi_pin_setup(pgm))
return -1;
/**********************************************
* set the ready LED and set our direction up *
**********************************************/
set_led_rdy(pgm,0);
set_led_pgm(pgm,1);
return 0;
}
static void avrftdi_close(PROGRAMMER * pgm)
{
avrftdi_t* pdata = to_pdata(pgm);
if(pdata->ftdic->usb_dev) {
set_pin(pgm, PIN_AVR_RESET, ON);
/* Stop driving the pins - except for the LEDs */
log_info("LED Mask=0x%04x value =0x%04x &=0x%04x\n",
pdata->led_mask, pdata->pin_value, pdata->led_mask & pdata->pin_value);
pdata->pin_direction = pdata->led_mask;
pdata->pin_value &= pdata->led_mask;
write_flush(pdata);
/* reset state recommended by FTDI */
ftdi_set_bitmode(pdata->ftdic, 0, BITMODE_RESET);
E_VOID(ftdi_usb_close(pdata->ftdic), pdata->ftdic);
}
return;
}
static int avrftdi_initialize(PROGRAMMER * pgm, AVRPART * p)
{
avrftdi_powerup(pgm);
if(p->flags & AVRPART_HAS_TPI)
{
/* see avrftdi_tpi.c */
avrftdi_tpi_initialize(pgm, p);
}
else
{
set_pin(pgm, PIN_AVR_RESET, OFF);
set_pin(pgm, PIN_AVR_SCK, OFF);
/*use speed optimization with CAUTION*/
usleep(20 * 1000);
/* giving rst-pulse of at least 2 avr-clock-cycles, for
* security (2us @ 1MHz) */
set_pin(pgm, PIN_AVR_RESET, ON);
usleep(20 * 1000);
/*setting rst back to 0 */
set_pin(pgm, PIN_AVR_RESET, OFF);
/*wait at least 20ms bevor issuing spi commands to avr */
usleep(20 * 1000);
}
return pgm->program_enable(pgm, p);
}
static void avrftdi_display(PROGRAMMER * pgm, const char *p)
{
// print the full pin definitiions as in ft245r ?
return;
}
static int avrftdi_cmd(PROGRAMMER * pgm, const unsigned char *cmd, unsigned char *res)
{
return avrftdi_transmit(pgm, MPSSE_DO_READ | MPSSE_DO_WRITE, cmd, res, 4);
}
static int avrftdi_program_enable(PROGRAMMER * pgm, AVRPART * p)
{
int i;
unsigned char buf[4];
memset(buf, 0, sizeof(buf));
if (p->op[AVR_OP_PGM_ENABLE] == NULL) {
log_err("AVR_OP_PGM_ENABLE command not defined for %s\n", p->desc);
return -1;
}
avr_set_bits(p->op[AVR_OP_PGM_ENABLE], buf);
for(i = 0; i < 4; i++) {
pgm->cmd(pgm, buf, buf);
if (buf[p->pollindex-1] != p->pollvalue) {
log_warn("Program enable command not successful. Retrying.\n");
set_pin(pgm, PIN_AVR_RESET, ON);
usleep(20);
set_pin(pgm, PIN_AVR_RESET, OFF);
avr_set_bits(p->op[AVR_OP_PGM_ENABLE], buf);
} else
return 0;
}
log_err("Device is not responding to program enable. Check connection.\n");
return -1;
}
static int avrftdi_chip_erase(PROGRAMMER * pgm, AVRPART * p)
{
unsigned char cmd[4];
unsigned char res[4];
if (p->op[AVR_OP_CHIP_ERASE] == NULL) {
log_err("AVR_OP_CHIP_ERASE command not defined for %s\n", p->desc);
return -1;
}
memset(cmd, 0, sizeof(cmd));
avr_set_bits(p->op[AVR_OP_CHIP_ERASE], cmd);
pgm->cmd(pgm, cmd, res);
usleep(p->chip_erase_delay);
pgm->initialize(pgm, p);
return 0;
}
/* Load extended address byte command */
static int
avrftdi_lext(PROGRAMMER *pgm, AVRPART *p, AVRMEM *m, unsigned int address)
{
unsigned char buf[] = { 0x00, 0x00, 0x00, 0x00 };
avr_set_bits(m->op[AVR_OP_LOAD_EXT_ADDR], buf);
avr_set_addr(m->op[AVR_OP_LOAD_EXT_ADDR], buf, address);
if(verbose > TRACE)
buf_dump(buf, sizeof(buf),
"load extended address command", 0, 16 * 3);
if (0 > avrftdi_transmit(pgm, MPSSE_DO_WRITE, buf, buf, 4))
return -1;
return 0;
}
static int avrftdi_eeprom_write(PROGRAMMER *pgm, AVRPART *p, AVRMEM *m,
unsigned int page_size, unsigned int addr, unsigned int len)
{
unsigned char cmd[] = { 0x00, 0x00, 0x00, 0x00 };
unsigned char *data = &m->buf[addr];
unsigned int add;
avr_set_bits(m->op[AVR_OP_WRITE], cmd);
for (add = addr; add < addr + len; add++)
{
avr_set_addr(m->op[AVR_OP_WRITE], cmd, add);
avr_set_input(m->op[AVR_OP_WRITE], cmd, *data++);
if (0 > avrftdi_transmit(pgm, MPSSE_DO_WRITE, cmd, cmd, 4))
return -1;
usleep((m->max_write_delay));
}
return len;
}
static int avrftdi_eeprom_read(PROGRAMMER *pgm, AVRPART *p, AVRMEM *m,
unsigned int page_size, unsigned int addr, unsigned int len)
{
unsigned char cmd[4];
unsigned char buffer[len], *bufptr = buffer;
unsigned int add;
memset(buffer, 0, sizeof(buffer));
for (add = addr; add < addr + len; add++)
{
memset(cmd, 0, sizeof(cmd));
avr_set_bits(m->op[AVR_OP_READ], cmd);
avr_set_addr(m->op[AVR_OP_READ], cmd, add);
if (0 > avrftdi_transmit(pgm, MPSSE_DO_READ | MPSSE_DO_WRITE, cmd, cmd, 4))
return -1;
avr_get_output(m->op[AVR_OP_READ], cmd, bufptr++);
}
memcpy(m->buf + addr, buffer, len);
return len;
}
static int avrftdi_flash_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
unsigned int page_size, unsigned int addr, unsigned int len)
{
int use_lext_address = m->op[AVR_OP_LOAD_EXT_ADDR] != NULL;
unsigned int word;
unsigned int poll_index;
unsigned int buf_size;
unsigned char poll_byte;
unsigned char *buffer = &m->buf[addr];
unsigned char buf[4*len+4], *bufptr = buf;
memset(buf, 0, sizeof(buf));
/* pre-check opcodes */
if (m->op[AVR_OP_LOADPAGE_LO] == NULL) {
log_err("AVR_OP_LOADPAGE_LO command not defined for %s\n", p->desc);
return -1;
}
if (m->op[AVR_OP_LOADPAGE_HI] == NULL) {
log_err("AVR_OP_LOADPAGE_HI command not defined for %s\n", p->desc);
return -1;
}
if(page_size != m->page_size) {
log_warn("Parameter page_size is %d, ", page_size);
log_warn("but m->page_size is %d. Using the latter.\n", m->page_size);
}
page_size = m->page_size;
/* if we do cross a 64k word boundary (or write the
* first page), we need to issue a 'load extended
* address byte' command, which is defined as 0x4d
* 0x00 <address byte> 0x00. As far as i know, this
* is only available on 256k parts. 64k word is 128k
* bytes.
* write the command only once.
*/
if(use_lext_address && (((addr/2) & 0xffff0000))) {
if (0 > avrftdi_lext(pgm, p, m, addr/2))
return -1;
}
/* prepare the command stream for the whole page */
/* addr is in bytes, but we program in words. addr/2 should be something
* like addr >> WORD_SHIFT, though */
for(word = addr/2; word < (len + addr)/2; word++)
{
log_debug("-< bytes = %d of %d\n", word * 2, len + addr);
/*setting word*/
avr_set_bits(m->op[AVR_OP_LOADPAGE_LO], bufptr);
/* here is the second byte increment, just if you're wondering */
avr_set_addr(m->op[AVR_OP_LOADPAGE_LO], bufptr, word);
avr_set_input(m->op[AVR_OP_LOADPAGE_LO], bufptr, *buffer++);
bufptr += 4;
avr_set_bits(m->op[AVR_OP_LOADPAGE_HI], bufptr);
avr_set_addr(m->op[AVR_OP_LOADPAGE_HI], bufptr, word);
avr_set_input(m->op[AVR_OP_LOADPAGE_HI], bufptr, *buffer++);
bufptr += 4;
}
/* issue write page command, if available */
if (m->op[AVR_OP_WRITEPAGE] == NULL) {
log_err("AVR_OP_WRITEPAGE command not defined for %s\n", p->desc);
return -1;
} else {
avr_set_bits(m->op[AVR_OP_WRITEPAGE], bufptr);
/* setting page address highbyte */
avr_set_addr(m->op[AVR_OP_WRITEPAGE],
bufptr, addr/2);
bufptr += 4;
}
buf_size = bufptr - buf;
if(verbose > TRACE)
buf_dump(buf, buf_size, "command buffer", 0, 16*2);
log_info("Transmitting buffer of size: %d\n", buf_size);
if (0 > avrftdi_transmit(pgm, MPSSE_DO_WRITE, buf, buf, buf_size))
return -1;
bufptr = buf;
/* find a poll byte. we cannot poll a value of 0xff, so look
* for a value != 0xff
*/
for(poll_index = addr+len-1; poll_index > addr-1; poll_index--)
if(m->buf[poll_index] != 0xff)
break;
if((poll_index < addr + len) && m->buf[poll_index] != 0xff)
{
log_info("Using m->buf[%d] = 0x%02x as polling value ", poll_index,
m->buf[poll_index]);
/* poll page write ready */
do {
log_info(".");
pgm->read_byte(pgm, p, m, poll_index, &poll_byte);
} while (m->buf[poll_index] != poll_byte);
log_info("\n");
}
else
{
log_warn("No suitable byte (!=0xff) for polling found.\n");
log_warn("Trying to sleep instead, but programming errors may occur.\n");
log_warn("Be sure to verify programmed memory (no -V option)\n");
/* TODO sync write */
/* sleep */
usleep((m->max_write_delay));
}
return len;
}
/*
*Reading from flash
*/
static int avrftdi_flash_read(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
unsigned int page_size, unsigned int addr, unsigned int len)
{
OPCODE * readop;
int byte, word;
int use_lext_address = m->op[AVR_OP_LOAD_EXT_ADDR] != NULL;
unsigned int address = addr/2;
unsigned char o_buf[4*len+4];
unsigned char i_buf[4*len+4];
unsigned int index;
memset(o_buf, 0, sizeof(o_buf));
memset(i_buf, 0, sizeof(i_buf));
/* pre-check opcodes */
if (m->op[AVR_OP_READ_LO] == NULL) {
log_err("AVR_OP_READ_LO command not defined for %s\n", p->desc);
return -1;
}
if (m->op[AVR_OP_READ_HI] == NULL) {
log_err("AVR_OP_READ_HI command not defined for %s\n", p->desc);
return -1;
}
if(use_lext_address && ((address & 0xffff0000))) {
if (0 > avrftdi_lext(pgm, p, m, address))
return -1;
}
/* word addressing! */
for(word = addr/2, index = 0; word < (addr + len)/2; word++)
{
/* one byte is transferred via a 4-byte opcode.
* TODO: reduce magic numbers
*/
avr_set_bits(m->op[AVR_OP_READ_LO], &o_buf[index*4]);
avr_set_addr(m->op[AVR_OP_READ_LO], &o_buf[index*4], word);
index++;
avr_set_bits(m->op[AVR_OP_READ_HI], &o_buf[index*4]);
avr_set_addr(m->op[AVR_OP_READ_HI], &o_buf[index*4], word);
index++;
}
/* transmit,
* if there was an error, we did not see, memory validation will
* subsequently fail.
*/
if(verbose > TRACE) {
buf_dump(o_buf, sizeof(o_buf), "o_buf", 0, 32);
}
if (0 > avrftdi_transmit(pgm, MPSSE_DO_READ | MPSSE_DO_WRITE, o_buf, i_buf, len * 4))
return -1;
if(verbose > TRACE) {
buf_dump(i_buf, sizeof(i_buf), "i_buf", 0, 32);
}
memset(&m->buf[addr], 0, page_size);
/* every (read) op is 4 bytes in size and yields one byte of memory data */
for(byte = 0; byte < page_size; byte++) {
if(byte & 1)
readop = m->op[AVR_OP_READ_HI];
else
readop = m->op[AVR_OP_READ_LO];
/* take 4 bytes and put the memory byte in the buffer at
* offset addr + offset of the current byte
*/
avr_get_output(readop, &i_buf[byte*4], &m->buf[addr+byte]);
}
if(verbose > TRACE)
buf_dump(&m->buf[addr], page_size, "page:", 0, 32);
return len;
}
static int avrftdi_paged_write(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
unsigned int page_size, unsigned int addr, unsigned int n_bytes)
{
if (strcmp(m->desc, "flash") == 0)
return avrftdi_flash_write(pgm, p, m, page_size, addr, n_bytes);
else if (strcmp(m->desc, "eeprom") == 0)
return avrftdi_eeprom_write(pgm, p, m, page_size, addr, n_bytes);
else
return -2;
}
static int avrftdi_paged_load(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m,
unsigned int page_size, unsigned int addr, unsigned int n_bytes)
{
if (strcmp(m->desc, "flash") == 0)
return avrftdi_flash_read(pgm, p, m, page_size, addr, n_bytes);
else if(strcmp(m->desc, "eeprom") == 0)
return avrftdi_eeprom_read(pgm, p, m, page_size, addr, n_bytes);
else
return -2;
}
static void
avrftdi_setup(PROGRAMMER * pgm)
{
avrftdi_t* pdata;
pgm->cookie = malloc(sizeof(avrftdi_t));
pdata = to_pdata(pgm);
pdata->ftdic = ftdi_new();
if(!pdata->ftdic)
{
log_err("Error allocating memory.\n");
exit(1);
}
E_VOID(ftdi_init(pdata->ftdic), pdata->ftdic);
pdata->pin_value = 0;
pdata->pin_direction = 0;
pdata->led_mask = 0;
}
static void
avrftdi_teardown(PROGRAMMER * pgm)
{
avrftdi_t* pdata = to_pdata(pgm);
if(pdata) {
ftdi_deinit(pdata->ftdic);
ftdi_free(pdata->ftdic);
free(pdata);
}
}
void avrftdi_initpgm(PROGRAMMER * pgm)
{
strcpy(pgm->type, "avrftdi");
/*
* mandatory functions
*/
pgm->initialize = avrftdi_initialize;
pgm->display = avrftdi_display;
pgm->enable = avrftdi_enable;
pgm->disable = avrftdi_disable;
pgm->powerup = avrftdi_powerup;
pgm->powerdown = avrftdi_powerdown;
pgm->program_enable = avrftdi_program_enable;
pgm->chip_erase = avrftdi_chip_erase;
pgm->cmd = avrftdi_cmd;
pgm->open = avrftdi_open;
pgm->close = avrftdi_close;
pgm->read_byte = avr_read_byte_default;
pgm->write_byte = avr_write_byte_default;
/*
* optional functions
*/
pgm->paged_write = avrftdi_paged_write;
pgm->paged_load = avrftdi_paged_load;
pgm->setpin = set_pin;
pgm->setup = avrftdi_setup;
pgm->teardown = avrftdi_teardown;
pgm->rdy_led = set_led_rdy;
pgm->err_led = set_led_err;
pgm->pgm_led = set_led_pgm;
pgm->vfy_led = set_led_vfy;
}
#endif /* DO_NOT_BUILD_AVRFTDI */
const char avrftdi_desc[] = "Interface to the MPSSE Engine of FTDI Chips using libftdi.";
|