| 1 | /*************************************************************************** |
| 2 | ftdi.c - description |
| 3 | ------------------- |
| 4 | begin : Fri Apr 4 2003 |
| 5 | copyright : (C) 2003 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 | #include <usb.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | #include "ftdi.h" |
| 21 | |
| 22 | #define ftdi_error_return(code, str) do { \ |
| 23 | ftdi->error_str = str; \ |
| 24 | return code; \ |
| 25 | } while(0); |
| 26 | |
| 27 | |
| 28 | /* ftdi_init |
| 29 | |
| 30 | Initializes a ftdi_context. |
| 31 | |
| 32 | Return codes: |
| 33 | 0: All fine |
| 34 | -1: Couldn't allocate read buffer |
| 35 | */ |
| 36 | int ftdi_init(struct ftdi_context *ftdi) |
| 37 | { |
| 38 | ftdi->usb_dev = NULL; |
| 39 | ftdi->usb_read_timeout = 5000; |
| 40 | ftdi->usb_write_timeout = 5000; |
| 41 | |
| 42 | ftdi->type = TYPE_BM; /* chip type */ |
| 43 | ftdi->baudrate = -1; |
| 44 | ftdi->bitbang_enabled = 0; |
| 45 | |
| 46 | ftdi->readbuffer = NULL; |
| 47 | ftdi->readbuffer_offset = 0; |
| 48 | ftdi->readbuffer_remaining = 0; |
| 49 | ftdi->writebuffer_chunksize = 4096; |
| 50 | |
| 51 | ftdi->interface = 0; |
| 52 | ftdi->index = 0; |
| 53 | ftdi->in_ep = 0x02; |
| 54 | ftdi->out_ep = 0x81; |
| 55 | ftdi->bitbang_mode = 1; /* 1: Normal bitbang mode, 2: SPI bitbang mode */ |
| 56 | |
| 57 | ftdi->error_str = NULL; |
| 58 | |
| 59 | /* All fine. Now allocate the readbuffer */ |
| 60 | return ftdi_read_data_set_chunksize(ftdi, 4096); |
| 61 | } |
| 62 | |
| 63 | /* ftdi_set_interface |
| 64 | |
| 65 | Call after ftdi_init |
| 66 | |
| 67 | Open selected channels on a chip, otherwise use first channel |
| 68 | 0: all fine |
| 69 | -1: unknown interface |
| 70 | */ |
| 71 | int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface) |
| 72 | { |
| 73 | switch (interface) { |
| 74 | case INTERFACE_ANY: |
| 75 | case INTERFACE_A: |
| 76 | /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */ |
| 77 | break; |
| 78 | case INTERFACE_B: |
| 79 | ftdi->interface = 1; |
| 80 | ftdi->index = INTERFACE_B; |
| 81 | ftdi->in_ep = 0x04; |
| 82 | ftdi->out_ep = 0x83; |
| 83 | break; |
| 84 | default: |
| 85 | ftdi_error_return(-1, "Unknown interface"); |
| 86 | } |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | /* ftdi_deinit |
| 91 | |
| 92 | Deinitializes a ftdi_context. |
| 93 | */ |
| 94 | void ftdi_deinit(struct ftdi_context *ftdi) |
| 95 | { |
| 96 | if (ftdi->readbuffer != NULL) { |
| 97 | free(ftdi->readbuffer); |
| 98 | ftdi->readbuffer = NULL; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* ftdi_set_usbdev |
| 103 | |
| 104 | Use an already open device. |
| 105 | */ |
| 106 | void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb) |
| 107 | { |
| 108 | ftdi->usb_dev = usb; |
| 109 | } |
| 110 | |
| 111 | |
| 112 | /* ftdi_usb_find_all |
| 113 | |
| 114 | Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which |
| 115 | needs to be deallocated by ftdi_list_free after use. |
| 116 | |
| 117 | Return codes: |
| 118 | >0: number of devices found |
| 119 | -1: usb_find_busses() failed |
| 120 | -2: usb_find_devices() failed |
| 121 | -3: out of memory |
| 122 | */ |
| 123 | int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product) |
| 124 | { |
| 125 | struct ftdi_device_list **curdev; |
| 126 | struct usb_bus *bus; |
| 127 | struct usb_device *dev; |
| 128 | int count = 0; |
| 129 | |
| 130 | usb_init(); |
| 131 | if (usb_find_busses() < 0) |
| 132 | ftdi_error_return(-1, "usb_find_busses() failed"); |
| 133 | if (usb_find_devices() < 0) |
| 134 | ftdi_error_return(-2, "usb_find_devices() failed"); |
| 135 | |
| 136 | curdev = devlist; |
| 137 | for (bus = usb_busses; bus; bus = bus->next) { |
| 138 | for (dev = bus->devices; dev; dev = dev->next) { |
| 139 | if (dev->descriptor.idVendor == vendor |
| 140 | && dev->descriptor.idProduct == product) |
| 141 | { |
| 142 | *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list)); |
| 143 | if (!*curdev) |
| 144 | ftdi_error_return(-3, "out of memory"); |
| 145 | |
| 146 | (*curdev)->next = NULL; |
| 147 | (*curdev)->dev = dev; |
| 148 | |
| 149 | curdev = &(*curdev)->next; |
| 150 | count++; |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | return count; |
| 156 | } |
| 157 | |
| 158 | /* ftdi_list_free |
| 159 | |
| 160 | Frees a created device list. |
| 161 | */ |
| 162 | void ftdi_list_free(struct ftdi_device_list **devlist) |
| 163 | { |
| 164 | struct ftdi_device_list **curdev; |
| 165 | for (; *devlist == NULL; devlist = curdev) { |
| 166 | curdev = &(*devlist)->next; |
| 167 | free(*devlist); |
| 168 | } |
| 169 | |
| 170 | devlist = NULL; |
| 171 | } |
| 172 | |
| 173 | /* ftdi_usb_open |
| 174 | |
| 175 | Opens the first device with a given vendor and product ids. |
| 176 | |
| 177 | Return codes: |
| 178 | See ftdi_usb_open_desc() |
| 179 | */ |
| 180 | int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product) |
| 181 | { |
| 182 | return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL); |
| 183 | } |
| 184 | |
| 185 | /* ftdi_usb_open_desc |
| 186 | |
| 187 | Opens the first device with a given, vendor id, product id, |
| 188 | description and serial. |
| 189 | |
| 190 | Return codes: |
| 191 | 0: all fine |
| 192 | -1: usb_find_busses() failed |
| 193 | -2: usb_find_devices() failed |
| 194 | -3: usb device not found |
| 195 | -4: unable to open device |
| 196 | -5: unable to claim device |
| 197 | -6: reset failed |
| 198 | -7: set baudrate failed |
| 199 | -8: get product description failed |
| 200 | -9: get serial number failed |
| 201 | -10: unable to close device |
| 202 | */ |
| 203 | int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product, |
| 204 | const char* description, const char* serial) |
| 205 | { |
| 206 | struct usb_bus *bus; |
| 207 | struct usb_device *dev; |
| 208 | char string[256]; |
| 209 | |
| 210 | usb_init(); |
| 211 | |
| 212 | if (usb_find_busses() < 0) |
| 213 | ftdi_error_return(-1, "usb_find_busses() failed"); |
| 214 | if (usb_find_devices() < 0) |
| 215 | ftdi_error_return(-2, "usb_find_devices() failed"); |
| 216 | |
| 217 | for (bus = usb_busses; bus; bus = bus->next) { |
| 218 | for (dev = bus->devices; dev; dev = dev->next) { |
| 219 | if (dev->descriptor.idVendor == vendor |
| 220 | && dev->descriptor.idProduct == product) { |
| 221 | if (!(ftdi->usb_dev = usb_open(dev))) |
| 222 | ftdi_error_return(-4, "usb_open() failed"); |
| 223 | |
| 224 | if (description != NULL) { |
| 225 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, string, sizeof(string)) <= 0) { |
| 226 | usb_close (ftdi->usb_dev); |
| 227 | ftdi_error_return(-8, "unable to fetch product description"); |
| 228 | } |
| 229 | if (strncmp(string, description, sizeof(string)) != 0) { |
| 230 | if (usb_close (ftdi->usb_dev) != 0) |
| 231 | ftdi_error_return(-10, "unable to close device"); |
| 232 | continue; |
| 233 | } |
| 234 | } |
| 235 | if (serial != NULL) { |
| 236 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, string, sizeof(string)) <= 0) { |
| 237 | usb_close (ftdi->usb_dev); |
| 238 | ftdi_error_return(-9, "unable to fetch serial number"); |
| 239 | } |
| 240 | if (strncmp(string, serial, sizeof(string)) != 0) { |
| 241 | if (usb_close (ftdi->usb_dev) != 0) |
| 242 | ftdi_error_return(-10, "unable to close device"); |
| 243 | continue; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | if (usb_close (ftdi->usb_dev) != 0) |
| 248 | ftdi_error_return(-10, "unable to close device"); |
| 249 | |
| 250 | return ftdi_usb_open_dev(ftdi, dev); |
| 251 | } |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | // device not found |
| 256 | ftdi_error_return(-3, "device not found"); |
| 257 | } |
| 258 | |
| 259 | /* ftdi_usb_reset |
| 260 | |
| 261 | Resets the ftdi device. |
| 262 | |
| 263 | Return codes: |
| 264 | 0: all fine |
| 265 | -1: FTDI reset failed |
| 266 | */ |
| 267 | int ftdi_usb_reset(struct ftdi_context *ftdi) |
| 268 | { |
| 269 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 270 | ftdi_error_return(-1,"FTDI reset failed"); |
| 271 | |
| 272 | // Invalidate data in the readbuffer |
| 273 | ftdi->readbuffer_offset = 0; |
| 274 | ftdi->readbuffer_remaining = 0; |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* ftdi_usb_purge_buffers |
| 280 | |
| 281 | Cleans the buffers of the ftdi device. |
| 282 | |
| 283 | Return codes: |
| 284 | 0: all fine |
| 285 | -1: write buffer purge failed |
| 286 | -2: read buffer purge failed |
| 287 | */ |
| 288 | int ftdi_usb_purge_buffers(struct ftdi_context *ftdi) |
| 289 | { |
| 290 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 1, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 291 | ftdi_error_return(-1, "FTDI purge of RX buffer failed"); |
| 292 | |
| 293 | // Invalidate data in the readbuffer |
| 294 | ftdi->readbuffer_offset = 0; |
| 295 | ftdi->readbuffer_remaining = 0; |
| 296 | |
| 297 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 2, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 298 | ftdi_error_return(-2, "FTDI purge of TX buffer failed"); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /* ftdi_usb_close |
| 304 | |
| 305 | Closes the ftdi device. |
| 306 | |
| 307 | Return codes: |
| 308 | 0: all fine |
| 309 | -1: usb_release failed |
| 310 | -2: usb_close failed |
| 311 | */ |
| 312 | int ftdi_usb_close(struct ftdi_context *ftdi) |
| 313 | { |
| 314 | int rtn = 0; |
| 315 | |
| 316 | if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0) |
| 317 | rtn = -1; |
| 318 | |
| 319 | if (usb_close (ftdi->usb_dev) != 0) |
| 320 | rtn = -2; |
| 321 | |
| 322 | return rtn; |
| 323 | } |
| 324 | |
| 325 | |
| 326 | /* |
| 327 | ftdi_convert_baudrate returns nearest supported baud rate to that requested. |
| 328 | Function is only used internally |
| 329 | */ |
| 330 | static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi, |
| 331 | unsigned short *value, unsigned short *index) |
| 332 | { |
| 333 | static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1}; |
| 334 | static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3}; |
| 335 | static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7}; |
| 336 | int divisor, best_divisor, best_baud, best_baud_diff; |
| 337 | unsigned long encoded_divisor; |
| 338 | int i; |
| 339 | |
| 340 | if (baudrate <= 0) { |
| 341 | // Return error |
| 342 | return -1; |
| 343 | } |
| 344 | |
| 345 | divisor = 24000000 / baudrate; |
| 346 | |
| 347 | if (ftdi->type == TYPE_AM) { |
| 348 | // Round down to supported fraction (AM only) |
| 349 | divisor -= am_adjust_dn[divisor & 7]; |
| 350 | } |
| 351 | |
| 352 | // Try this divisor and the one above it (because division rounds down) |
| 353 | best_divisor = 0; |
| 354 | best_baud = 0; |
| 355 | best_baud_diff = 0; |
| 356 | for (i = 0; i < 2; i++) { |
| 357 | int try_divisor = divisor + i; |
| 358 | int baud_estimate; |
| 359 | int baud_diff; |
| 360 | |
| 361 | // Round up to supported divisor value |
| 362 | if (try_divisor <= 8) { |
| 363 | // Round up to minimum supported divisor |
| 364 | try_divisor = 8; |
| 365 | } else if (ftdi->type != TYPE_AM && try_divisor < 12) { |
| 366 | // BM doesn't support divisors 9 through 11 inclusive |
| 367 | try_divisor = 12; |
| 368 | } else if (divisor < 16) { |
| 369 | // AM doesn't support divisors 9 through 15 inclusive |
| 370 | try_divisor = 16; |
| 371 | } else { |
| 372 | if (ftdi->type == TYPE_AM) { |
| 373 | // Round up to supported fraction (AM only) |
| 374 | try_divisor += am_adjust_up[try_divisor & 7]; |
| 375 | if (try_divisor > 0x1FFF8) { |
| 376 | // Round down to maximum supported divisor value (for AM) |
| 377 | try_divisor = 0x1FFF8; |
| 378 | } |
| 379 | } else { |
| 380 | if (try_divisor > 0x1FFFF) { |
| 381 | // Round down to maximum supported divisor value (for BM) |
| 382 | try_divisor = 0x1FFFF; |
| 383 | } |
| 384 | } |
| 385 | } |
| 386 | // Get estimated baud rate (to nearest integer) |
| 387 | baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor; |
| 388 | // Get absolute difference from requested baud rate |
| 389 | if (baud_estimate < baudrate) { |
| 390 | baud_diff = baudrate - baud_estimate; |
| 391 | } else { |
| 392 | baud_diff = baud_estimate - baudrate; |
| 393 | } |
| 394 | if (i == 0 || baud_diff < best_baud_diff) { |
| 395 | // Closest to requested baud rate so far |
| 396 | best_divisor = try_divisor; |
| 397 | best_baud = baud_estimate; |
| 398 | best_baud_diff = baud_diff; |
| 399 | if (baud_diff == 0) { |
| 400 | // Spot on! No point trying |
| 401 | break; |
| 402 | } |
| 403 | } |
| 404 | } |
| 405 | // Encode the best divisor value |
| 406 | encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14); |
| 407 | // Deal with special cases for encoded value |
| 408 | if (encoded_divisor == 1) { |
| 409 | encoded_divisor = 0; // 3000000 baud |
| 410 | } else if (encoded_divisor == 0x4001) { |
| 411 | encoded_divisor = 1; // 2000000 baud (BM only) |
| 412 | } |
| 413 | // Split into "value" and "index" values |
| 414 | *value = (unsigned short)(encoded_divisor & 0xFFFF); |
| 415 | if(ftdi->type == TYPE_2232C) { |
| 416 | *index = (unsigned short)(encoded_divisor >> 8); |
| 417 | *index &= 0xFF00; |
| 418 | *index |= ftdi->interface; |
| 419 | } |
| 420 | else |
| 421 | *index = (unsigned short)(encoded_divisor >> 16); |
| 422 | |
| 423 | // Return the nearest baud rate |
| 424 | return best_baud; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | ftdi_set_baudrate |
| 429 | |
| 430 | Sets the chip baudrate |
| 431 | |
| 432 | Return codes: |
| 433 | 0: all fine |
| 434 | -1: invalid baudrate |
| 435 | -2: setting baudrate failed |
| 436 | */ |
| 437 | int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate) |
| 438 | { |
| 439 | unsigned short value, index; |
| 440 | int actual_baudrate; |
| 441 | |
| 442 | if (ftdi->bitbang_enabled) { |
| 443 | baudrate = baudrate*4; |
| 444 | } |
| 445 | |
| 446 | actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index); |
| 447 | if (actual_baudrate <= 0) |
| 448 | ftdi_error_return (-1, "Silly baudrate <= 0."); |
| 449 | |
| 450 | // Check within tolerance (about 5%) |
| 451 | if ((actual_baudrate * 2 < baudrate /* Catch overflows */ ) |
| 452 | || ((actual_baudrate < baudrate) |
| 453 | ? (actual_baudrate * 21 < baudrate * 20) |
| 454 | : (baudrate * 21 < actual_baudrate * 20))) |
| 455 | ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4"); |
| 456 | |
| 457 | if (usb_control_msg(ftdi->usb_dev, 0x40, 3, value, index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 458 | ftdi_error_return (-2, "Setting new baudrate failed"); |
| 459 | |
| 460 | ftdi->baudrate = baudrate; |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | ftdi_set_line_property |
| 466 | |
| 467 | set (RS232) line characteristics by Alain Abbas |
| 468 | |
| 469 | Return codes: |
| 470 | 0: all fine |
| 471 | -1: Setting line property failed |
| 472 | */ |
| 473 | int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits, |
| 474 | enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity) |
| 475 | { |
| 476 | unsigned short value = bits; |
| 477 | |
| 478 | switch(parity) { |
| 479 | case NONE: |
| 480 | value |= (0x00 << 8); |
| 481 | break; |
| 482 | case ODD: |
| 483 | value |= (0x01 << 8); |
| 484 | break; |
| 485 | case EVEN: |
| 486 | value |= (0x02 << 8); |
| 487 | break; |
| 488 | case MARK: |
| 489 | value |= (0x03 << 8); |
| 490 | break; |
| 491 | case SPACE: |
| 492 | value |= (0x04 << 8); |
| 493 | break; |
| 494 | } |
| 495 | |
| 496 | switch(sbit) { |
| 497 | case STOP_BIT_1: |
| 498 | value |= (0x00 << 11); |
| 499 | break; |
| 500 | case STOP_BIT_15: |
| 501 | value |= (0x01 << 11); |
| 502 | break; |
| 503 | case STOP_BIT_2: |
| 504 | value |= (0x02 << 11); |
| 505 | break; |
| 506 | } |
| 507 | |
| 508 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x04, value, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 509 | ftdi_error_return (-1, "Setting new line property failed"); |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 515 | { |
| 516 | int ret; |
| 517 | int offset = 0; |
| 518 | int total_written = 0; |
| 519 | |
| 520 | while (offset < size) { |
| 521 | int write_size = ftdi->writebuffer_chunksize; |
| 522 | |
| 523 | if (offset+write_size > size) |
| 524 | write_size = size-offset; |
| 525 | |
| 526 | ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout); |
| 527 | if (ret < 0) |
| 528 | ftdi_error_return(ret, "usb bulk write failed"); |
| 529 | |
| 530 | total_written += ret; |
| 531 | offset += write_size; |
| 532 | } |
| 533 | |
| 534 | return total_written; |
| 535 | } |
| 536 | |
| 537 | |
| 538 | int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) |
| 539 | { |
| 540 | ftdi->writebuffer_chunksize = chunksize; |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | |
| 545 | int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) |
| 546 | { |
| 547 | *chunksize = ftdi->writebuffer_chunksize; |
| 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | |
| 552 | int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 553 | { |
| 554 | int offset = 0, ret = 1, i, num_of_chunks, chunk_remains; |
| 555 | |
| 556 | // everything we want is still in the readbuffer? |
| 557 | if (size <= ftdi->readbuffer_remaining) { |
| 558 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size); |
| 559 | |
| 560 | // Fix offsets |
| 561 | ftdi->readbuffer_remaining -= size; |
| 562 | ftdi->readbuffer_offset += size; |
| 563 | |
| 564 | /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */ |
| 565 | |
| 566 | return size; |
| 567 | } |
| 568 | // something still in the readbuffer, but not enough to satisfy 'size'? |
| 569 | if (ftdi->readbuffer_remaining != 0) { |
| 570 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining); |
| 571 | |
| 572 | // Fix offset |
| 573 | offset += ftdi->readbuffer_remaining; |
| 574 | } |
| 575 | // do the actual USB read |
| 576 | while (offset < size && ret > 0) { |
| 577 | ftdi->readbuffer_remaining = 0; |
| 578 | ftdi->readbuffer_offset = 0; |
| 579 | /* returns how much received */ |
| 580 | ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout); |
| 581 | if (ret < 0) |
| 582 | ftdi_error_return(ret, "usb bulk read failed"); |
| 583 | |
| 584 | if (ret > 2) { |
| 585 | // skip FTDI status bytes. |
| 586 | // Maybe stored in the future to enable modem use |
| 587 | num_of_chunks = ret / 64; |
| 588 | chunk_remains = ret % 64; |
| 589 | //printf("ret = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", ret, num_of_chunks, chunk_remains, ftdi->readbuffer_offset); |
| 590 | |
| 591 | ftdi->readbuffer_offset += 2; |
| 592 | ret -= 2; |
| 593 | |
| 594 | if (ret > 62) { |
| 595 | for (i = 1; i < num_of_chunks; i++) |
| 596 | memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i, |
| 597 | ftdi->readbuffer+ftdi->readbuffer_offset+64*i, |
| 598 | 62); |
| 599 | if (chunk_remains > 2) { |
| 600 | memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i, |
| 601 | ftdi->readbuffer+ftdi->readbuffer_offset+64*i, |
| 602 | chunk_remains-2); |
| 603 | ret -= 2*num_of_chunks; |
| 604 | } else |
| 605 | ret -= 2*(num_of_chunks-1)+chunk_remains; |
| 606 | } |
| 607 | } else if (ret <= 2) { |
| 608 | // no more data to read? |
| 609 | return offset; |
| 610 | } |
| 611 | if (ret > 0) { |
| 612 | // data still fits in buf? |
| 613 | if (offset+ret <= size) { |
| 614 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret); |
| 615 | //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]); |
| 616 | offset += ret; |
| 617 | |
| 618 | /* Did we read exactly the right amount of bytes? */ |
| 619 | if (offset == size) |
| 620 | //printf("read_data exact rem %d offset %d\n", |
| 621 | //ftdi->readbuffer_remaining, offset); |
| 622 | return offset; |
| 623 | } else { |
| 624 | // only copy part of the data or size <= readbuffer_chunksize |
| 625 | int part_size = size-offset; |
| 626 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size); |
| 627 | |
| 628 | ftdi->readbuffer_offset += part_size; |
| 629 | ftdi->readbuffer_remaining = ret-part_size; |
| 630 | offset += part_size; |
| 631 | |
| 632 | /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n", |
| 633 | part_size, size, offset, ret, ftdi->readbuffer_remaining); */ |
| 634 | |
| 635 | return offset; |
| 636 | } |
| 637 | } |
| 638 | } |
| 639 | // never reached |
| 640 | return -127; |
| 641 | } |
| 642 | |
| 643 | |
| 644 | int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) |
| 645 | { |
| 646 | unsigned char *new_buf; |
| 647 | |
| 648 | // Invalidate all remaining data |
| 649 | ftdi->readbuffer_offset = 0; |
| 650 | ftdi->readbuffer_remaining = 0; |
| 651 | |
| 652 | if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) |
| 653 | ftdi_error_return(-1, "out of memory for readbuffer"); |
| 654 | |
| 655 | ftdi->readbuffer = new_buf; |
| 656 | ftdi->readbuffer_chunksize = chunksize; |
| 657 | |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | |
| 662 | int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) |
| 663 | { |
| 664 | *chunksize = ftdi->readbuffer_chunksize; |
| 665 | return 0; |
| 666 | } |
| 667 | |
| 668 | |
| 669 | |
| 670 | int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask) |
| 671 | { |
| 672 | unsigned short usb_val; |
| 673 | |
| 674 | usb_val = bitmask; // low byte: bitmask |
| 675 | /* FT2232C: Set bitbang_mode to 2 to enable SPI */ |
| 676 | usb_val |= (ftdi->bitbang_mode << 8); |
| 677 | |
| 678 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 679 | ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?"); |
| 680 | |
| 681 | ftdi->bitbang_enabled = 1; |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | |
| 686 | int ftdi_disable_bitbang(struct ftdi_context *ftdi) |
| 687 | { |
| 688 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 689 | ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?"); |
| 690 | |
| 691 | ftdi->bitbang_enabled = 0; |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | |
| 696 | int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode) |
| 697 | { |
| 698 | unsigned short usb_val; |
| 699 | |
| 700 | usb_val = bitmask; // low byte: bitmask |
| 701 | usb_val |= (mode << 8); |
| 702 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 703 | ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?"); |
| 704 | |
| 705 | ftdi->bitbang_mode = mode; |
| 706 | ftdi->bitbang_enabled = (mode == BITMODE_BITBANG || mode == BITMODE_SYNCBB)?1:0; |
| 707 | return 0; |
| 708 | } |
| 709 | |
| 710 | int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins) |
| 711 | { |
| 712 | unsigned short usb_val; |
| 713 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0C, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) |
| 714 | ftdi_error_return(-1, "read pins failed"); |
| 715 | |
| 716 | *pins = (unsigned char)usb_val; |
| 717 | return 0; |
| 718 | } |
| 719 | |
| 720 | |
| 721 | int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency) |
| 722 | { |
| 723 | unsigned short usb_val; |
| 724 | |
| 725 | if (latency < 1) |
| 726 | ftdi_error_return(-1, "latency out of range. Only valid for 1-255"); |
| 727 | |
| 728 | usb_val = latency; |
| 729 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x09, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 730 | ftdi_error_return(-2, "unable to set latency timer"); |
| 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | |
| 736 | int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency) |
| 737 | { |
| 738 | unsigned short usb_val; |
| 739 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0A, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) |
| 740 | ftdi_error_return(-1, "reading latency timer failed"); |
| 741 | |
| 742 | *latency = (unsigned char)usb_val; |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | |
| 747 | void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom) |
| 748 | { |
| 749 | eeprom->vendor_id = 0x0403; |
| 750 | eeprom->product_id = 0x6001; |
| 751 | |
| 752 | eeprom->self_powered = 1; |
| 753 | eeprom->remote_wakeup = 1; |
| 754 | eeprom->BM_type_chip = 1; |
| 755 | |
| 756 | eeprom->in_is_isochronous = 0; |
| 757 | eeprom->out_is_isochronous = 0; |
| 758 | eeprom->suspend_pull_downs = 0; |
| 759 | |
| 760 | eeprom->use_serial = 0; |
| 761 | eeprom->change_usb_version = 0; |
| 762 | eeprom->usb_version = 0x0200; |
| 763 | eeprom->max_power = 0; |
| 764 | |
| 765 | eeprom->manufacturer = NULL; |
| 766 | eeprom->product = NULL; |
| 767 | eeprom->serial = NULL; |
| 768 | } |
| 769 | |
| 770 | |
| 771 | /* |
| 772 | ftdi_eeprom_build |
| 773 | |
| 774 | Build binary output from ftdi_eeprom structure. |
| 775 | Output is suitable for ftdi_write_eeprom. |
| 776 | |
| 777 | Return codes: |
| 778 | positive value: used eeprom size |
| 779 | -1: eeprom size (128 bytes) exceeded by custom strings |
| 780 | */ |
| 781 | int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output) |
| 782 | { |
| 783 | unsigned char i, j; |
| 784 | unsigned short checksum, value; |
| 785 | unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0; |
| 786 | int size_check; |
| 787 | |
| 788 | if (eeprom->manufacturer != NULL) |
| 789 | manufacturer_size = strlen(eeprom->manufacturer); |
| 790 | if (eeprom->product != NULL) |
| 791 | product_size = strlen(eeprom->product); |
| 792 | if (eeprom->serial != NULL) |
| 793 | serial_size = strlen(eeprom->serial); |
| 794 | |
| 795 | size_check = 128; // eeprom is 128 bytes |
| 796 | size_check -= 28; // 28 are always in use (fixed) |
| 797 | size_check -= manufacturer_size*2; |
| 798 | size_check -= product_size*2; |
| 799 | size_check -= serial_size*2; |
| 800 | |
| 801 | // eeprom size exceeded? |
| 802 | if (size_check < 0) |
| 803 | return (-1); |
| 804 | |
| 805 | // empty eeprom |
| 806 | memset (output, 0, 128); |
| 807 | |
| 808 | // Addr 00: Stay 00 00 |
| 809 | // Addr 02: Vendor ID |
| 810 | output[0x02] = eeprom->vendor_id; |
| 811 | output[0x03] = eeprom->vendor_id >> 8; |
| 812 | |
| 813 | // Addr 04: Product ID |
| 814 | output[0x04] = eeprom->product_id; |
| 815 | output[0x05] = eeprom->product_id >> 8; |
| 816 | |
| 817 | // Addr 06: Device release number (0400h for BM features) |
| 818 | output[0x06] = 0x00; |
| 819 | |
| 820 | if (eeprom->BM_type_chip == 1) |
| 821 | output[0x07] = 0x04; |
| 822 | else |
| 823 | output[0x07] = 0x02; |
| 824 | |
| 825 | // Addr 08: Config descriptor |
| 826 | // Bit 1: remote wakeup if 1 |
| 827 | // Bit 0: self powered if 1 |
| 828 | // |
| 829 | j = 0; |
| 830 | if (eeprom->self_powered == 1) |
| 831 | j = j | 1; |
| 832 | if (eeprom->remote_wakeup == 1) |
| 833 | j = j | 2; |
| 834 | output[0x08] = j; |
| 835 | |
| 836 | // Addr 09: Max power consumption: max power = value * 2 mA |
| 837 | output[0x09] = eeprom->max_power; |
| 838 | ; |
| 839 | |
| 840 | // Addr 0A: Chip configuration |
| 841 | // Bit 7: 0 - reserved |
| 842 | // Bit 6: 0 - reserved |
| 843 | // Bit 5: 0 - reserved |
| 844 | // Bit 4: 1 - Change USB version |
| 845 | // Bit 3: 1 - Use the serial number string |
| 846 | // Bit 2: 1 - Enable suspend pull downs for lower power |
| 847 | // Bit 1: 1 - Out EndPoint is Isochronous |
| 848 | // Bit 0: 1 - In EndPoint is Isochronous |
| 849 | // |
| 850 | j = 0; |
| 851 | if (eeprom->in_is_isochronous == 1) |
| 852 | j = j | 1; |
| 853 | if (eeprom->out_is_isochronous == 1) |
| 854 | j = j | 2; |
| 855 | if (eeprom->suspend_pull_downs == 1) |
| 856 | j = j | 4; |
| 857 | if (eeprom->use_serial == 1) |
| 858 | j = j | 8; |
| 859 | if (eeprom->change_usb_version == 1) |
| 860 | j = j | 16; |
| 861 | output[0x0A] = j; |
| 862 | |
| 863 | // Addr 0B: reserved |
| 864 | output[0x0B] = 0x00; |
| 865 | |
| 866 | // Addr 0C: USB version low byte when 0x0A bit 4 is set |
| 867 | // Addr 0D: USB version high byte when 0x0A bit 4 is set |
| 868 | if (eeprom->change_usb_version == 1) { |
| 869 | output[0x0C] = eeprom->usb_version; |
| 870 | output[0x0D] = eeprom->usb_version >> 8; |
| 871 | } |
| 872 | |
| 873 | |
| 874 | // Addr 0E: Offset of the manufacturer string + 0x80 |
| 875 | output[0x0E] = 0x14 + 0x80; |
| 876 | |
| 877 | // Addr 0F: Length of manufacturer string |
| 878 | output[0x0F] = manufacturer_size*2 + 2; |
| 879 | |
| 880 | // Addr 10: Offset of the product string + 0x80, calculated later |
| 881 | // Addr 11: Length of product string |
| 882 | output[0x11] = product_size*2 + 2; |
| 883 | |
| 884 | // Addr 12: Offset of the serial string + 0x80, calculated later |
| 885 | // Addr 13: Length of serial string |
| 886 | output[0x13] = serial_size*2 + 2; |
| 887 | |
| 888 | // Dynamic content |
| 889 | output[0x14] = manufacturer_size*2 + 2; |
| 890 | output[0x15] = 0x03; // type: string |
| 891 | |
| 892 | i = 0x16, j = 0; |
| 893 | |
| 894 | // Output manufacturer |
| 895 | for (j = 0; j < manufacturer_size; j++) { |
| 896 | output[i] = eeprom->manufacturer[j], i++; |
| 897 | output[i] = 0x00, i++; |
| 898 | } |
| 899 | |
| 900 | // Output product name |
| 901 | output[0x10] = i + 0x80; // calculate offset |
| 902 | output[i] = product_size*2 + 2, i++; |
| 903 | output[i] = 0x03, i++; |
| 904 | for (j = 0; j < product_size; j++) { |
| 905 | output[i] = eeprom->product[j], i++; |
| 906 | output[i] = 0x00, i++; |
| 907 | } |
| 908 | |
| 909 | // Output serial |
| 910 | output[0x12] = i + 0x80; // calculate offset |
| 911 | output[i] = serial_size*2 + 2, i++; |
| 912 | output[i] = 0x03, i++; |
| 913 | for (j = 0; j < serial_size; j++) { |
| 914 | output[i] = eeprom->serial[j], i++; |
| 915 | output[i] = 0x00, i++; |
| 916 | } |
| 917 | |
| 918 | // calculate checksum |
| 919 | checksum = 0xAAAA; |
| 920 | |
| 921 | for (i = 0; i < 63; i++) { |
| 922 | value = output[i*2]; |
| 923 | value += output[(i*2)+1] << 8; |
| 924 | |
| 925 | checksum = value^checksum; |
| 926 | checksum = (checksum << 1) | (checksum >> 15); |
| 927 | } |
| 928 | |
| 929 | output[0x7E] = checksum; |
| 930 | output[0x7F] = checksum >> 8; |
| 931 | |
| 932 | return size_check; |
| 933 | } |
| 934 | |
| 935 | |
| 936 | int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) |
| 937 | { |
| 938 | int i; |
| 939 | |
| 940 | for (i = 0; i < 64; i++) { |
| 941 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) |
| 942 | ftdi_error_return(-1, "reading eeprom failed"); |
| 943 | } |
| 944 | |
| 945 | return 0; |
| 946 | } |
| 947 | |
| 948 | |
| 949 | int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) |
| 950 | { |
| 951 | unsigned short usb_val; |
| 952 | int i; |
| 953 | |
| 954 | for (i = 0; i < 64; i++) { |
| 955 | usb_val = eeprom[i*2]; |
| 956 | usb_val += eeprom[(i*2)+1] << 8; |
| 957 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x91, usb_val, i, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 958 | ftdi_error_return(-1, "unable to write eeprom"); |
| 959 | } |
| 960 | |
| 961 | return 0; |
| 962 | } |
| 963 | |
| 964 | |
| 965 | int ftdi_erase_eeprom(struct ftdi_context *ftdi) |
| 966 | { |
| 967 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x92, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 968 | ftdi_error_return(-1, "unable to erase eeprom"); |
| 969 | |
| 970 | return 0; |
| 971 | } |
| 972 | |
| 973 | |
| 974 | char *ftdi_get_error_string (struct ftdi_context *ftdi) |
| 975 | { |
| 976 | return ftdi->error_str; |
| 977 | } |