| 1 | /*************************************************************************** |
| 2 | ftdi.c - description |
| 3 | ------------------- |
| 4 | begin : Fri Apr 4 2003 |
| 5 | copyright : (C) 2003-2008 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/de/produkte/opensource/ftdi/ |
| 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 <usb.h> |
| 32 | #include <string.h> |
| 33 | #include <errno.h> |
| 34 | |
| 35 | #include "ftdi.h" |
| 36 | |
| 37 | /* stuff needed for async write */ |
| 38 | #ifdef LIBFTDI_LINUX_ASYNC_MODE |
| 39 | #include <sys/ioctl.h> |
| 40 | #include <sys/time.h> |
| 41 | #include <sys/select.h> |
| 42 | #include <sys/types.h> |
| 43 | #include <unistd.h> |
| 44 | #include <linux/usbdevice_fs.h> |
| 45 | #endif |
| 46 | |
| 47 | #define ftdi_error_return(code, str) do { \ |
| 48 | ftdi->error_str = str; \ |
| 49 | return code; \ |
| 50 | } while(0); |
| 51 | |
| 52 | |
| 53 | /** |
| 54 | Initializes a ftdi_context. |
| 55 | |
| 56 | \param ftdi pointer to ftdi_context |
| 57 | |
| 58 | \retval 0: all fine |
| 59 | \retval -1: couldn't allocate read buffer |
| 60 | |
| 61 | \remark This should be called before all functions |
| 62 | */ |
| 63 | int ftdi_init(struct ftdi_context *ftdi) |
| 64 | { |
| 65 | int i; |
| 66 | |
| 67 | ftdi->usb_dev = NULL; |
| 68 | ftdi->usb_read_timeout = 5000; |
| 69 | ftdi->usb_write_timeout = 5000; |
| 70 | |
| 71 | ftdi->type = TYPE_BM; /* chip type */ |
| 72 | ftdi->baudrate = -1; |
| 73 | ftdi->bitbang_enabled = 0; |
| 74 | |
| 75 | ftdi->readbuffer = NULL; |
| 76 | ftdi->readbuffer_offset = 0; |
| 77 | ftdi->readbuffer_remaining = 0; |
| 78 | ftdi->writebuffer_chunksize = 4096; |
| 79 | |
| 80 | ftdi->interface = 0; |
| 81 | ftdi->index = 0; |
| 82 | ftdi->in_ep = 0x02; |
| 83 | ftdi->out_ep = 0x81; |
| 84 | ftdi->bitbang_mode = 1; /* 1: Normal bitbang mode, 2: SPI bitbang mode */ |
| 85 | |
| 86 | ftdi->error_str = NULL; |
| 87 | |
| 88 | #ifdef LIBFTDI_LINUX_ASYNC_MODE |
| 89 | ftdi->async_usb_buffer_size=10; |
| 90 | if ((ftdi->async_usb_buffer=malloc(sizeof(struct usbdevfs_urb)*ftdi->async_usb_buffer_size)) == NULL) |
| 91 | ftdi_error_return(-1, "out of memory for async usb buffer"); |
| 92 | |
| 93 | /* initialize async usb buffer with unused-marker */ |
| 94 | for (i=0; i < ftdi->async_usb_buffer_size; i++) |
| 95 | ((struct usbdevfs_urb*)ftdi->async_usb_buffer)[i].usercontext = FTDI_URB_USERCONTEXT_COOKIE; |
| 96 | #else |
| 97 | ftdi->async_usb_buffer_size=0; |
| 98 | ftdi->async_usb_buffer = NULL; |
| 99 | #endif |
| 100 | |
| 101 | ftdi->eeprom_size = FTDI_DEFAULT_EEPROM_SIZE; |
| 102 | |
| 103 | /* All fine. Now allocate the readbuffer */ |
| 104 | return ftdi_read_data_set_chunksize(ftdi, 4096); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | Allocate and initialize a new ftdi_context |
| 109 | |
| 110 | \return a pointer to a new ftdi_context, or NULL on failure |
| 111 | */ |
| 112 | struct ftdi_context *ftdi_new() |
| 113 | { |
| 114 | struct ftdi_context * ftdi = (struct ftdi_context *)malloc(sizeof(struct ftdi_context)); |
| 115 | |
| 116 | if (ftdi == NULL) { |
| 117 | return NULL; |
| 118 | } |
| 119 | |
| 120 | if (ftdi_init(ftdi) != 0) { |
| 121 | free(ftdi); |
| 122 | return NULL; |
| 123 | } |
| 124 | |
| 125 | return ftdi; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | Open selected channels on a chip, otherwise use first channel. |
| 130 | |
| 131 | \param ftdi pointer to ftdi_context |
| 132 | \param interface Interface to use for FT2232C chips. |
| 133 | |
| 134 | \retval 0: all fine |
| 135 | \retval -1: unknown interface |
| 136 | */ |
| 137 | int ftdi_set_interface(struct ftdi_context *ftdi, enum ftdi_interface interface) |
| 138 | { |
| 139 | switch (interface) { |
| 140 | case INTERFACE_ANY: |
| 141 | case INTERFACE_A: |
| 142 | /* ftdi_usb_open_desc cares to set the right index, depending on the found chip */ |
| 143 | break; |
| 144 | case INTERFACE_B: |
| 145 | ftdi->interface = 1; |
| 146 | ftdi->index = INTERFACE_B; |
| 147 | ftdi->in_ep = 0x04; |
| 148 | ftdi->out_ep = 0x83; |
| 149 | break; |
| 150 | default: |
| 151 | ftdi_error_return(-1, "Unknown interface"); |
| 152 | } |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | Deinitializes a ftdi_context. |
| 158 | |
| 159 | \param ftdi pointer to ftdi_context |
| 160 | */ |
| 161 | void ftdi_deinit(struct ftdi_context *ftdi) |
| 162 | { |
| 163 | if (ftdi->async_usb_buffer != NULL) { |
| 164 | free(ftdi->async_usb_buffer); |
| 165 | ftdi->async_usb_buffer = NULL; |
| 166 | } |
| 167 | |
| 168 | if (ftdi->readbuffer != NULL) { |
| 169 | free(ftdi->readbuffer); |
| 170 | ftdi->readbuffer = NULL; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | Deinitialize and free an ftdi_context. |
| 176 | |
| 177 | \param ftdi pointer to ftdi_context |
| 178 | */ |
| 179 | void ftdi_free(struct ftdi_context *ftdi) |
| 180 | { |
| 181 | ftdi_deinit(ftdi); |
| 182 | free(ftdi); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | Use an already open libusb device. |
| 187 | |
| 188 | \param ftdi pointer to ftdi_context |
| 189 | \param usb libusb usb_dev_handle to use |
| 190 | */ |
| 191 | void ftdi_set_usbdev (struct ftdi_context *ftdi, usb_dev_handle *usb) |
| 192 | { |
| 193 | ftdi->usb_dev = usb; |
| 194 | } |
| 195 | |
| 196 | |
| 197 | /** |
| 198 | Finds all ftdi devices on the usb bus. Creates a new ftdi_device_list which |
| 199 | needs to be deallocated by ftdi_list_free() after use. |
| 200 | |
| 201 | \param ftdi pointer to ftdi_context |
| 202 | \param devlist Pointer where to store list of found devices |
| 203 | \param vendor Vendor ID to search for |
| 204 | \param product Product ID to search for |
| 205 | |
| 206 | \retval >0: number of devices found |
| 207 | \retval -1: usb_find_busses() failed |
| 208 | \retval -2: usb_find_devices() failed |
| 209 | \retval -3: out of memory |
| 210 | */ |
| 211 | int ftdi_usb_find_all(struct ftdi_context *ftdi, struct ftdi_device_list **devlist, int vendor, int product) |
| 212 | { |
| 213 | struct ftdi_device_list **curdev; |
| 214 | struct usb_bus *bus; |
| 215 | struct usb_device *dev; |
| 216 | int count = 0; |
| 217 | |
| 218 | usb_init(); |
| 219 | if (usb_find_busses() < 0) |
| 220 | ftdi_error_return(-1, "usb_find_busses() failed"); |
| 221 | if (usb_find_devices() < 0) |
| 222 | ftdi_error_return(-2, "usb_find_devices() failed"); |
| 223 | |
| 224 | curdev = devlist; |
| 225 | *curdev = NULL; |
| 226 | for (bus = usb_busses; bus; bus = bus->next) { |
| 227 | for (dev = bus->devices; dev; dev = dev->next) { |
| 228 | if (dev->descriptor.idVendor == vendor |
| 229 | && dev->descriptor.idProduct == product) |
| 230 | { |
| 231 | *curdev = (struct ftdi_device_list*)malloc(sizeof(struct ftdi_device_list)); |
| 232 | if (!*curdev) |
| 233 | ftdi_error_return(-3, "out of memory"); |
| 234 | |
| 235 | (*curdev)->next = NULL; |
| 236 | (*curdev)->dev = dev; |
| 237 | |
| 238 | curdev = &(*curdev)->next; |
| 239 | count++; |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | return count; |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | Frees a usb device list. |
| 249 | |
| 250 | \param devlist USB device list created by ftdi_usb_find_all() |
| 251 | */ |
| 252 | void ftdi_list_free(struct ftdi_device_list **devlist) |
| 253 | { |
| 254 | struct ftdi_device_list *curdev, *next; |
| 255 | |
| 256 | for (curdev = *devlist; curdev != NULL;) { |
| 257 | next = curdev->next; |
| 258 | free(curdev); |
| 259 | curdev = next; |
| 260 | } |
| 261 | |
| 262 | *devlist = NULL; |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | Frees a usb device list. |
| 267 | |
| 268 | \param devlist USB device list created by ftdi_usb_find_all() |
| 269 | */ |
| 270 | void ftdi_list_free2(struct ftdi_device_list *devlist) |
| 271 | { |
| 272 | ftdi_list_free(&devlist); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | Return device ID strings from the usb device. |
| 277 | |
| 278 | The parameters manufacturer, description and serial may be NULL |
| 279 | or pointer to buffers to store the fetched strings. |
| 280 | |
| 281 | \note Use this function only in combination with ftdi_usb_find_all() |
| 282 | as it closes the internal "usb_dev" after use. |
| 283 | |
| 284 | \param ftdi pointer to ftdi_context |
| 285 | \param dev libusb usb_dev to use |
| 286 | \param manufacturer Store manufacturer string here if not NULL |
| 287 | \param mnf_len Buffer size of manufacturer string |
| 288 | \param description Store product description string here if not NULL |
| 289 | \param desc_len Buffer size of product description string |
| 290 | \param serial Store serial string here if not NULL |
| 291 | \param serial_len Buffer size of serial string |
| 292 | |
| 293 | \retval 0: all fine |
| 294 | \retval -1: wrong arguments |
| 295 | \retval -4: unable to open device |
| 296 | \retval -7: get product manufacturer failed |
| 297 | \retval -8: get product description failed |
| 298 | \retval -9: get serial number failed |
| 299 | \retval -10: unable to close device |
| 300 | */ |
| 301 | int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct usb_device * dev, |
| 302 | char * manufacturer, int mnf_len, char * description, int desc_len, char * serial, int serial_len) |
| 303 | { |
| 304 | if ((ftdi==NULL) || (dev==NULL)) |
| 305 | return -1; |
| 306 | |
| 307 | if (!(ftdi->usb_dev = usb_open(dev))) |
| 308 | ftdi_error_return(-4, usb_strerror()); |
| 309 | |
| 310 | if (manufacturer != NULL) { |
| 311 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iManufacturer, manufacturer, mnf_len) <= 0) { |
| 312 | usb_close (ftdi->usb_dev); |
| 313 | ftdi_error_return(-7, usb_strerror()); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | if (description != NULL) { |
| 318 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, description, desc_len) <= 0) { |
| 319 | usb_close (ftdi->usb_dev); |
| 320 | ftdi_error_return(-8, usb_strerror()); |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | if (serial != NULL) { |
| 325 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, serial, serial_len) <= 0) { |
| 326 | usb_close (ftdi->usb_dev); |
| 327 | ftdi_error_return(-9, usb_strerror()); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | if (usb_close (ftdi->usb_dev) != 0) |
| 332 | ftdi_error_return(-10, usb_strerror()); |
| 333 | |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | Opens a ftdi device given by a usb_device. |
| 339 | |
| 340 | \param ftdi pointer to ftdi_context |
| 341 | \param dev libusb usb_dev to use |
| 342 | |
| 343 | \retval 0: all fine |
| 344 | \retval -4: unable to open device |
| 345 | \retval -5: unable to claim device |
| 346 | \retval -6: reset failed |
| 347 | \retval -7: set baudrate failed |
| 348 | */ |
| 349 | int ftdi_usb_open_dev(struct ftdi_context *ftdi, struct usb_device *dev) |
| 350 | { |
| 351 | int detach_errno = 0; |
| 352 | if (!(ftdi->usb_dev = usb_open(dev))) |
| 353 | ftdi_error_return(-4, "usb_open() failed"); |
| 354 | |
| 355 | #ifdef LIBUSB_HAS_GET_DRIVER_NP |
| 356 | // Try to detach ftdi_sio kernel module |
| 357 | // Returns ENODATA if driver is not loaded |
| 358 | if (usb_detach_kernel_driver_np(ftdi->usb_dev, ftdi->interface) != 0 && errno != ENODATA) |
| 359 | detach_errno = errno; |
| 360 | #endif |
| 361 | |
| 362 | if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0) { |
| 363 | usb_close (ftdi->usb_dev); |
| 364 | if (detach_errno == EPERM) { |
| 365 | ftdi_error_return(-8, "inappropriate permissions on device!"); |
| 366 | } else { |
| 367 | ftdi_error_return(-5, "unable to claim usb device. Make sure ftdi_sio is unloaded!"); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | if (ftdi_usb_reset (ftdi) != 0) { |
| 372 | usb_close (ftdi->usb_dev); |
| 373 | ftdi_error_return(-6, "ftdi_usb_reset failed"); |
| 374 | } |
| 375 | |
| 376 | if (ftdi_set_baudrate (ftdi, 9600) != 0) { |
| 377 | usb_close (ftdi->usb_dev); |
| 378 | ftdi_error_return(-7, "set baudrate failed"); |
| 379 | } |
| 380 | |
| 381 | // Try to guess chip type |
| 382 | // Bug in the BM type chips: bcdDevice is 0x200 for serial == 0 |
| 383 | if (dev->descriptor.bcdDevice == 0x400 || (dev->descriptor.bcdDevice == 0x200 |
| 384 | && dev->descriptor.iSerialNumber == 0)) |
| 385 | ftdi->type = TYPE_BM; |
| 386 | else if (dev->descriptor.bcdDevice == 0x200) |
| 387 | ftdi->type = TYPE_AM; |
| 388 | else if (dev->descriptor.bcdDevice == 0x500) { |
| 389 | ftdi->type = TYPE_2232C; |
| 390 | if (!ftdi->index) |
| 391 | ftdi->index = INTERFACE_A; |
| 392 | } else if (dev->descriptor.bcdDevice == 0x600) |
| 393 | ftdi->type = TYPE_R; |
| 394 | |
| 395 | ftdi_error_return(0, "all fine"); |
| 396 | } |
| 397 | |
| 398 | /** |
| 399 | Opens the first device with a given vendor and product ids. |
| 400 | |
| 401 | \param ftdi pointer to ftdi_context |
| 402 | \param vendor Vendor ID |
| 403 | \param product Product ID |
| 404 | |
| 405 | \retval same as ftdi_usb_open_desc() |
| 406 | */ |
| 407 | int ftdi_usb_open(struct ftdi_context *ftdi, int vendor, int product) |
| 408 | { |
| 409 | return ftdi_usb_open_desc(ftdi, vendor, product, NULL, NULL); |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | Opens the first device with a given, vendor id, product id, |
| 414 | description and serial. |
| 415 | |
| 416 | \param ftdi pointer to ftdi_context |
| 417 | \param vendor Vendor ID |
| 418 | \param product Product ID |
| 419 | \param description Description to search for. Use NULL if not needed. |
| 420 | \param serial Serial to search for. Use NULL if not needed. |
| 421 | |
| 422 | \retval 0: all fine |
| 423 | \retval -1: usb_find_busses() failed |
| 424 | \retval -2: usb_find_devices() failed |
| 425 | \retval -3: usb device not found |
| 426 | \retval -4: unable to open device |
| 427 | \retval -5: unable to claim device |
| 428 | \retval -6: reset failed |
| 429 | \retval -7: set baudrate failed |
| 430 | \retval -8: get product description failed |
| 431 | \retval -9: get serial number failed |
| 432 | \retval -10: unable to close device |
| 433 | */ |
| 434 | int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product, |
| 435 | const char* description, const char* serial) |
| 436 | { |
| 437 | struct usb_bus *bus; |
| 438 | struct usb_device *dev; |
| 439 | char string[256]; |
| 440 | |
| 441 | usb_init(); |
| 442 | |
| 443 | if (usb_find_busses() < 0) |
| 444 | ftdi_error_return(-1, "usb_find_busses() failed"); |
| 445 | if (usb_find_devices() < 0) |
| 446 | ftdi_error_return(-2, "usb_find_devices() failed"); |
| 447 | |
| 448 | for (bus = usb_busses; bus; bus = bus->next) { |
| 449 | for (dev = bus->devices; dev; dev = dev->next) { |
| 450 | if (dev->descriptor.idVendor == vendor |
| 451 | && dev->descriptor.idProduct == product) { |
| 452 | if (!(ftdi->usb_dev = usb_open(dev))) |
| 453 | ftdi_error_return(-4, "usb_open() failed"); |
| 454 | |
| 455 | if (description != NULL) { |
| 456 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iProduct, string, sizeof(string)) <= 0) { |
| 457 | usb_close (ftdi->usb_dev); |
| 458 | ftdi_error_return(-8, "unable to fetch product description"); |
| 459 | } |
| 460 | if (strncmp(string, description, sizeof(string)) != 0) { |
| 461 | if (usb_close (ftdi->usb_dev) != 0) |
| 462 | ftdi_error_return(-10, "unable to close device"); |
| 463 | continue; |
| 464 | } |
| 465 | } |
| 466 | if (serial != NULL) { |
| 467 | if (usb_get_string_simple(ftdi->usb_dev, dev->descriptor.iSerialNumber, string, sizeof(string)) <= 0) { |
| 468 | usb_close (ftdi->usb_dev); |
| 469 | ftdi_error_return(-9, "unable to fetch serial number"); |
| 470 | } |
| 471 | if (strncmp(string, serial, sizeof(string)) != 0) { |
| 472 | if (usb_close (ftdi->usb_dev) != 0) |
| 473 | ftdi_error_return(-10, "unable to close device"); |
| 474 | continue; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | if (usb_close (ftdi->usb_dev) != 0) |
| 479 | ftdi_error_return(-10, "unable to close device"); |
| 480 | |
| 481 | return ftdi_usb_open_dev(ftdi, dev); |
| 482 | } |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | // device not found |
| 487 | ftdi_error_return(-3, "device not found"); |
| 488 | } |
| 489 | |
| 490 | /** |
| 491 | Resets the ftdi device. |
| 492 | |
| 493 | \param ftdi pointer to ftdi_context |
| 494 | |
| 495 | \retval 0: all fine |
| 496 | \retval -1: FTDI reset failed |
| 497 | */ |
| 498 | int ftdi_usb_reset(struct ftdi_context *ftdi) |
| 499 | { |
| 500 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 501 | ftdi_error_return(-1,"FTDI reset failed"); |
| 502 | |
| 503 | // Invalidate data in the readbuffer |
| 504 | ftdi->readbuffer_offset = 0; |
| 505 | ftdi->readbuffer_remaining = 0; |
| 506 | |
| 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | Clears the read buffer on the chip and the internal read buffer. |
| 512 | |
| 513 | \param ftdi pointer to ftdi_context |
| 514 | |
| 515 | \retval 0: all fine |
| 516 | \retval -1: read buffer purge failed |
| 517 | */ |
| 518 | int ftdi_usb_purge_rx_buffer(struct ftdi_context *ftdi) |
| 519 | { |
| 520 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 1, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 521 | ftdi_error_return(-1, "FTDI purge of RX buffer failed"); |
| 522 | |
| 523 | // Invalidate data in the readbuffer |
| 524 | ftdi->readbuffer_offset = 0; |
| 525 | ftdi->readbuffer_remaining = 0; |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /** |
| 531 | Clears the write buffer on the chip. |
| 532 | |
| 533 | \param ftdi pointer to ftdi_context |
| 534 | |
| 535 | \retval 0: all fine |
| 536 | \retval -1: write buffer purge failed |
| 537 | */ |
| 538 | int ftdi_usb_purge_tx_buffer(struct ftdi_context *ftdi) |
| 539 | { |
| 540 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0, 2, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 541 | ftdi_error_return(-1, "FTDI purge of TX buffer failed"); |
| 542 | |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | Clears the buffers on the chip and the internal read buffer. |
| 548 | |
| 549 | \param ftdi pointer to ftdi_context |
| 550 | |
| 551 | \retval 0: all fine |
| 552 | \retval -1: read buffer purge failed |
| 553 | \retval -2: write buffer purge failed |
| 554 | */ |
| 555 | int ftdi_usb_purge_buffers(struct ftdi_context *ftdi) |
| 556 | { |
| 557 | int result; |
| 558 | |
| 559 | result = ftdi_usb_purge_rx_buffer(ftdi); |
| 560 | if (result < 0) |
| 561 | return -1; |
| 562 | |
| 563 | result = ftdi_usb_purge_tx_buffer(ftdi); |
| 564 | if (result < 0) |
| 565 | return -2; |
| 566 | |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | Closes the ftdi device. Call ftdi_deinit() if you're cleaning up. |
| 572 | |
| 573 | \param ftdi pointer to ftdi_context |
| 574 | |
| 575 | \retval 0: all fine |
| 576 | \retval -1: usb_release failed |
| 577 | \retval -2: usb_close failed |
| 578 | */ |
| 579 | int ftdi_usb_close(struct ftdi_context *ftdi) |
| 580 | { |
| 581 | int rtn = 0; |
| 582 | |
| 583 | #ifdef LIBFTDI_LINUX_ASYNC_MODE |
| 584 | /* try to release some kernel resources */ |
| 585 | ftdi_async_complete(ftdi,1); |
| 586 | #endif |
| 587 | |
| 588 | if (usb_release_interface(ftdi->usb_dev, ftdi->interface) != 0) |
| 589 | rtn = -1; |
| 590 | |
| 591 | if (usb_close (ftdi->usb_dev) != 0) |
| 592 | rtn = -2; |
| 593 | |
| 594 | return rtn; |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | ftdi_convert_baudrate returns nearest supported baud rate to that requested. |
| 599 | Function is only used internally |
| 600 | \internal |
| 601 | */ |
| 602 | static int ftdi_convert_baudrate(int baudrate, struct ftdi_context *ftdi, |
| 603 | unsigned short *value, unsigned short *index) |
| 604 | { |
| 605 | static const char am_adjust_up[8] = {0, 0, 0, 1, 0, 3, 2, 1}; |
| 606 | static const char am_adjust_dn[8] = {0, 0, 0, 1, 0, 1, 2, 3}; |
| 607 | static const char frac_code[8] = {0, 3, 2, 4, 1, 5, 6, 7}; |
| 608 | int divisor, best_divisor, best_baud, best_baud_diff; |
| 609 | unsigned long encoded_divisor; |
| 610 | int i; |
| 611 | |
| 612 | if (baudrate <= 0) { |
| 613 | // Return error |
| 614 | return -1; |
| 615 | } |
| 616 | |
| 617 | divisor = 24000000 / baudrate; |
| 618 | |
| 619 | if (ftdi->type == TYPE_AM) { |
| 620 | // Round down to supported fraction (AM only) |
| 621 | divisor -= am_adjust_dn[divisor & 7]; |
| 622 | } |
| 623 | |
| 624 | // Try this divisor and the one above it (because division rounds down) |
| 625 | best_divisor = 0; |
| 626 | best_baud = 0; |
| 627 | best_baud_diff = 0; |
| 628 | for (i = 0; i < 2; i++) { |
| 629 | int try_divisor = divisor + i; |
| 630 | int baud_estimate; |
| 631 | int baud_diff; |
| 632 | |
| 633 | // Round up to supported divisor value |
| 634 | if (try_divisor <= 8) { |
| 635 | // Round up to minimum supported divisor |
| 636 | try_divisor = 8; |
| 637 | } else if (ftdi->type != TYPE_AM && try_divisor < 12) { |
| 638 | // BM doesn't support divisors 9 through 11 inclusive |
| 639 | try_divisor = 12; |
| 640 | } else if (divisor < 16) { |
| 641 | // AM doesn't support divisors 9 through 15 inclusive |
| 642 | try_divisor = 16; |
| 643 | } else { |
| 644 | if (ftdi->type == TYPE_AM) { |
| 645 | // Round up to supported fraction (AM only) |
| 646 | try_divisor += am_adjust_up[try_divisor & 7]; |
| 647 | if (try_divisor > 0x1FFF8) { |
| 648 | // Round down to maximum supported divisor value (for AM) |
| 649 | try_divisor = 0x1FFF8; |
| 650 | } |
| 651 | } else { |
| 652 | if (try_divisor > 0x1FFFF) { |
| 653 | // Round down to maximum supported divisor value (for BM) |
| 654 | try_divisor = 0x1FFFF; |
| 655 | } |
| 656 | } |
| 657 | } |
| 658 | // Get estimated baud rate (to nearest integer) |
| 659 | baud_estimate = (24000000 + (try_divisor / 2)) / try_divisor; |
| 660 | // Get absolute difference from requested baud rate |
| 661 | if (baud_estimate < baudrate) { |
| 662 | baud_diff = baudrate - baud_estimate; |
| 663 | } else { |
| 664 | baud_diff = baud_estimate - baudrate; |
| 665 | } |
| 666 | if (i == 0 || baud_diff < best_baud_diff) { |
| 667 | // Closest to requested baud rate so far |
| 668 | best_divisor = try_divisor; |
| 669 | best_baud = baud_estimate; |
| 670 | best_baud_diff = baud_diff; |
| 671 | if (baud_diff == 0) { |
| 672 | // Spot on! No point trying |
| 673 | break; |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | // Encode the best divisor value |
| 678 | encoded_divisor = (best_divisor >> 3) | (frac_code[best_divisor & 7] << 14); |
| 679 | // Deal with special cases for encoded value |
| 680 | if (encoded_divisor == 1) { |
| 681 | encoded_divisor = 0; // 3000000 baud |
| 682 | } else if (encoded_divisor == 0x4001) { |
| 683 | encoded_divisor = 1; // 2000000 baud (BM only) |
| 684 | } |
| 685 | // Split into "value" and "index" values |
| 686 | *value = (unsigned short)(encoded_divisor & 0xFFFF); |
| 687 | if(ftdi->type == TYPE_2232C) { |
| 688 | *index = (unsigned short)(encoded_divisor >> 8); |
| 689 | *index &= 0xFF00; |
| 690 | *index |= ftdi->index; |
| 691 | } |
| 692 | else |
| 693 | *index = (unsigned short)(encoded_divisor >> 16); |
| 694 | |
| 695 | // Return the nearest baud rate |
| 696 | return best_baud; |
| 697 | } |
| 698 | |
| 699 | /** |
| 700 | Sets the chip baud rate |
| 701 | |
| 702 | \param ftdi pointer to ftdi_context |
| 703 | \param baudrate baud rate to set |
| 704 | |
| 705 | \retval 0: all fine |
| 706 | \retval -1: invalid baudrate |
| 707 | \retval -2: setting baudrate failed |
| 708 | */ |
| 709 | int ftdi_set_baudrate(struct ftdi_context *ftdi, int baudrate) |
| 710 | { |
| 711 | unsigned short value, index; |
| 712 | int actual_baudrate; |
| 713 | |
| 714 | if (ftdi->bitbang_enabled) { |
| 715 | baudrate = baudrate*4; |
| 716 | } |
| 717 | |
| 718 | actual_baudrate = ftdi_convert_baudrate(baudrate, ftdi, &value, &index); |
| 719 | if (actual_baudrate <= 0) |
| 720 | ftdi_error_return (-1, "Silly baudrate <= 0."); |
| 721 | |
| 722 | // Check within tolerance (about 5%) |
| 723 | if ((actual_baudrate * 2 < baudrate /* Catch overflows */ ) |
| 724 | || ((actual_baudrate < baudrate) |
| 725 | ? (actual_baudrate * 21 < baudrate * 20) |
| 726 | : (baudrate * 21 < actual_baudrate * 20))) |
| 727 | ftdi_error_return (-1, "Unsupported baudrate. Note: bitbang baudrates are automatically multiplied by 4"); |
| 728 | |
| 729 | if (usb_control_msg(ftdi->usb_dev, 0x40, 3, value, index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 730 | ftdi_error_return (-2, "Setting new baudrate failed"); |
| 731 | |
| 732 | ftdi->baudrate = baudrate; |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | /** |
| 737 | Set (RS232) line characteristics by Alain Abbas |
| 738 | |
| 739 | \param ftdi pointer to ftdi_context |
| 740 | \param bits Number of bits |
| 741 | \param sbit Number of stop bits |
| 742 | \param parity Parity mode |
| 743 | |
| 744 | \retval 0: all fine |
| 745 | \retval -1: Setting line property failed |
| 746 | */ |
| 747 | int ftdi_set_line_property(struct ftdi_context *ftdi, enum ftdi_bits_type bits, |
| 748 | enum ftdi_stopbits_type sbit, enum ftdi_parity_type parity) |
| 749 | { |
| 750 | unsigned short value = bits; |
| 751 | |
| 752 | switch(parity) { |
| 753 | case NONE: |
| 754 | value |= (0x00 << 8); |
| 755 | break; |
| 756 | case ODD: |
| 757 | value |= (0x01 << 8); |
| 758 | break; |
| 759 | case EVEN: |
| 760 | value |= (0x02 << 8); |
| 761 | break; |
| 762 | case MARK: |
| 763 | value |= (0x03 << 8); |
| 764 | break; |
| 765 | case SPACE: |
| 766 | value |= (0x04 << 8); |
| 767 | break; |
| 768 | } |
| 769 | |
| 770 | switch(sbit) { |
| 771 | case STOP_BIT_1: |
| 772 | value |= (0x00 << 11); |
| 773 | break; |
| 774 | case STOP_BIT_15: |
| 775 | value |= (0x01 << 11); |
| 776 | break; |
| 777 | case STOP_BIT_2: |
| 778 | value |= (0x02 << 11); |
| 779 | break; |
| 780 | } |
| 781 | |
| 782 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x04, value, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 783 | ftdi_error_return (-1, "Setting new line property failed"); |
| 784 | |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | /** |
| 789 | Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip |
| 790 | |
| 791 | \param ftdi pointer to ftdi_context |
| 792 | \param buf Buffer with the data |
| 793 | \param size Size of the buffer |
| 794 | |
| 795 | \retval <0: error code from usb_bulk_write() |
| 796 | \retval >0: number of bytes written |
| 797 | */ |
| 798 | int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 799 | { |
| 800 | int ret; |
| 801 | int offset = 0; |
| 802 | int total_written = 0; |
| 803 | |
| 804 | while (offset < size) { |
| 805 | int write_size = ftdi->writebuffer_chunksize; |
| 806 | |
| 807 | if (offset+write_size > size) |
| 808 | write_size = size-offset; |
| 809 | |
| 810 | ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout); |
| 811 | if (ret < 0) |
| 812 | ftdi_error_return(ret, "usb bulk write failed"); |
| 813 | |
| 814 | total_written += ret; |
| 815 | offset += write_size; |
| 816 | } |
| 817 | |
| 818 | return total_written; |
| 819 | } |
| 820 | |
| 821 | #ifdef LIBFTDI_LINUX_ASYNC_MODE |
| 822 | /* this is strongly dependent on libusb using the same struct layout. If libusb |
| 823 | changes in some later version this may break horribly (this is for libusb 0.1.12) */ |
| 824 | struct usb_dev_handle { |
| 825 | int fd; |
| 826 | // some other stuff coming here we don't need |
| 827 | }; |
| 828 | |
| 829 | /** |
| 830 | Check for pending async urbs |
| 831 | \internal |
| 832 | */ |
| 833 | static int _usb_get_async_urbs_pending(struct ftdi_context *ftdi) |
| 834 | { |
| 835 | struct usbdevfs_urb *urb; |
| 836 | int pending=0; |
| 837 | int i; |
| 838 | |
| 839 | for (i=0; i < ftdi->async_usb_buffer_size; i++) { |
| 840 | urb=&((struct usbdevfs_urb *)(ftdi->async_usb_buffer))[i]; |
| 841 | if (urb->usercontext != FTDI_URB_USERCONTEXT_COOKIE) |
| 842 | pending++; |
| 843 | } |
| 844 | |
| 845 | return pending; |
| 846 | } |
| 847 | |
| 848 | /** |
| 849 | Wait until one or more async URBs are completed by the kernel and mark their |
| 850 | positions in the async-buffer as unused |
| 851 | |
| 852 | \param ftdi pointer to ftdi_context |
| 853 | \param wait_for_more if != 0 wait for more than one write to complete |
| 854 | \param timeout_msec max milliseconds to wait |
| 855 | |
| 856 | \internal |
| 857 | */ |
| 858 | static void _usb_async_cleanup(struct ftdi_context *ftdi, int wait_for_more, int timeout_msec) |
| 859 | { |
| 860 | struct timeval tv; |
| 861 | struct usbdevfs_urb *urb=NULL; |
| 862 | int ret; |
| 863 | fd_set writefds; |
| 864 | int keep_going=0; |
| 865 | |
| 866 | FD_ZERO(&writefds); |
| 867 | FD_SET(ftdi->usb_dev->fd, &writefds); |
| 868 | |
| 869 | /* init timeout only once, select writes time left after call */ |
| 870 | tv.tv_sec = timeout_msec / 1000; |
| 871 | tv.tv_usec = (timeout_msec % 1000) * 1000; |
| 872 | |
| 873 | do { |
| 874 | while (_usb_get_async_urbs_pending(ftdi) |
| 875 | && (ret = ioctl(ftdi->usb_dev->fd, USBDEVFS_REAPURBNDELAY, &urb)) == -1 |
| 876 | && errno == EAGAIN) |
| 877 | { |
| 878 | if (keep_going && !wait_for_more) { |
| 879 | /* don't wait if repeating only for keep_going */ |
| 880 | keep_going=0; |
| 881 | break; |
| 882 | } |
| 883 | |
| 884 | /* wait for timeout msec or something written ready */ |
| 885 | select(ftdi->usb_dev->fd+1, NULL, &writefds, NULL, &tv); |
| 886 | } |
| 887 | |
| 888 | if (ret == 0 && urb != NULL) { |
| 889 | /* got a free urb, mark it */ |
| 890 | urb->usercontext = FTDI_URB_USERCONTEXT_COOKIE; |
| 891 | |
| 892 | /* try to get more urbs that are ready now, but don't wait anymore */ |
| 893 | urb=NULL; |
| 894 | keep_going=1; |
| 895 | } else { |
| 896 | /* no more urbs waiting */ |
| 897 | keep_going=0; |
| 898 | } |
| 899 | } while (keep_going); |
| 900 | } |
| 901 | |
| 902 | /** |
| 903 | Wait until one or more async URBs are completed by the kernel and mark their |
| 904 | positions in the async-buffer as unused. |
| 905 | |
| 906 | \param ftdi pointer to ftdi_context |
| 907 | \param wait_for_more if != 0 wait for more than one write to complete (until write timeout) |
| 908 | */ |
| 909 | void ftdi_async_complete(struct ftdi_context *ftdi, int wait_for_more) |
| 910 | { |
| 911 | _usb_async_cleanup(ftdi,wait_for_more,ftdi->usb_write_timeout); |
| 912 | } |
| 913 | |
| 914 | /** |
| 915 | Stupid libusb does not offer async writes nor does it allow |
| 916 | access to its fd - so we need some hacks here. |
| 917 | \internal |
| 918 | */ |
| 919 | static int _usb_bulk_write_async(struct ftdi_context *ftdi, int ep, char *bytes, int size) |
| 920 | { |
| 921 | struct usbdevfs_urb *urb; |
| 922 | int bytesdone = 0, requested; |
| 923 | int ret, i; |
| 924 | int cleanup_count; |
| 925 | |
| 926 | do { |
| 927 | /* find a free urb buffer we can use */ |
| 928 | urb=NULL; |
| 929 | for (cleanup_count=0; urb==NULL && cleanup_count <= 1; cleanup_count++) |
| 930 | { |
| 931 | if (i==ftdi->async_usb_buffer_size) { |
| 932 | /* wait until some buffers are free */ |
| 933 | _usb_async_cleanup(ftdi,0,ftdi->usb_write_timeout); |
| 934 | } |
| 935 | |
| 936 | for (i=0; i < ftdi->async_usb_buffer_size; i++) { |
| 937 | urb=&((struct usbdevfs_urb *)(ftdi->async_usb_buffer))[i]; |
| 938 | if (urb->usercontext == FTDI_URB_USERCONTEXT_COOKIE) |
| 939 | break; /* found a free urb position */ |
| 940 | urb=NULL; |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | /* no free urb position found */ |
| 945 | if (urb==NULL) |
| 946 | return -1; |
| 947 | |
| 948 | requested = size - bytesdone; |
| 949 | if (requested > 4096) |
| 950 | requested = 4096; |
| 951 | |
| 952 | memset(urb,0,sizeof(urb)); |
| 953 | |
| 954 | urb->type = USBDEVFS_URB_TYPE_BULK; |
| 955 | urb->endpoint = ep; |
| 956 | urb->flags = 0; |
| 957 | urb->buffer = bytes + bytesdone; |
| 958 | urb->buffer_length = requested; |
| 959 | urb->signr = 0; |
| 960 | urb->actual_length = 0; |
| 961 | urb->number_of_packets = 0; |
| 962 | urb->usercontext = 0; |
| 963 | |
| 964 | do { |
| 965 | ret = ioctl(ftdi->usb_dev->fd, USBDEVFS_SUBMITURB, urb); |
| 966 | } while (ret < 0 && errno == EINTR); |
| 967 | if (ret < 0) |
| 968 | return ret; /* the caller can read errno to get more info */ |
| 969 | |
| 970 | bytesdone += requested; |
| 971 | } while (bytesdone < size); |
| 972 | return bytesdone; |
| 973 | } |
| 974 | |
| 975 | /** |
| 976 | Writes data in chunks (see ftdi_write_data_set_chunksize()) to the chip. |
| 977 | Does not wait for completion of the transfer nor does it make sure that |
| 978 | the transfer was successful. |
| 979 | |
| 980 | This function could be extended to use signals and callbacks to inform the |
| 981 | caller of completion or error - but this is not done yet, volunteers welcome. |
| 982 | |
| 983 | Works around libusb and directly accesses functions only available on Linux. |
| 984 | Only available if compiled with --with-async-mode. |
| 985 | |
| 986 | \param ftdi pointer to ftdi_context |
| 987 | \param buf Buffer with the data |
| 988 | \param size Size of the buffer |
| 989 | |
| 990 | \retval <0: error code from usb_bulk_write() |
| 991 | \retval >0: number of bytes written |
| 992 | */ |
| 993 | int ftdi_write_data_async(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 994 | { |
| 995 | int ret; |
| 996 | int offset = 0; |
| 997 | int total_written = 0; |
| 998 | |
| 999 | while (offset < size) { |
| 1000 | int write_size = ftdi->writebuffer_chunksize; |
| 1001 | |
| 1002 | if (offset+write_size > size) |
| 1003 | write_size = size-offset; |
| 1004 | |
| 1005 | ret = _usb_bulk_write_async(ftdi, ftdi->in_ep, buf+offset, write_size); |
| 1006 | if (ret < 0) |
| 1007 | ftdi_error_return(ret, "usb bulk write async failed"); |
| 1008 | |
| 1009 | total_written += ret; |
| 1010 | offset += write_size; |
| 1011 | } |
| 1012 | |
| 1013 | return total_written; |
| 1014 | } |
| 1015 | #endif // LIBFTDI_LINUX_ASYNC_MODE |
| 1016 | |
| 1017 | /** |
| 1018 | Configure write buffer chunk size. |
| 1019 | Default is 4096. |
| 1020 | |
| 1021 | \param ftdi pointer to ftdi_context |
| 1022 | \param chunksize Chunk size |
| 1023 | |
| 1024 | \retval 0: all fine |
| 1025 | */ |
| 1026 | int ftdi_write_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) |
| 1027 | { |
| 1028 | ftdi->writebuffer_chunksize = chunksize; |
| 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | /** |
| 1033 | Get write buffer chunk size. |
| 1034 | |
| 1035 | \param ftdi pointer to ftdi_context |
| 1036 | \param chunksize Pointer to store chunk size in |
| 1037 | |
| 1038 | \retval 0: all fine |
| 1039 | */ |
| 1040 | int ftdi_write_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) |
| 1041 | { |
| 1042 | *chunksize = ftdi->writebuffer_chunksize; |
| 1043 | return 0; |
| 1044 | } |
| 1045 | |
| 1046 | /** |
| 1047 | Reads data in chunks (see ftdi_read_data_set_chunksize()) from the chip. |
| 1048 | |
| 1049 | Automatically strips the two modem status bytes transfered during every read. |
| 1050 | |
| 1051 | \param ftdi pointer to ftdi_context |
| 1052 | \param buf Buffer to store data in |
| 1053 | \param size Size of the buffer |
| 1054 | |
| 1055 | \retval <0: error code from usb_bulk_read() |
| 1056 | \retval 0: no data was available |
| 1057 | \retval >0: number of bytes read |
| 1058 | |
| 1059 | \remark This function is not useful in bitbang mode. |
| 1060 | Use ftdi_read_pins() to get the current state of the pins. |
| 1061 | */ |
| 1062 | int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size) |
| 1063 | { |
| 1064 | int offset = 0, ret = 1, i, num_of_chunks, chunk_remains; |
| 1065 | |
| 1066 | // everything we want is still in the readbuffer? |
| 1067 | if (size <= ftdi->readbuffer_remaining) { |
| 1068 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, size); |
| 1069 | |
| 1070 | // Fix offsets |
| 1071 | ftdi->readbuffer_remaining -= size; |
| 1072 | ftdi->readbuffer_offset += size; |
| 1073 | |
| 1074 | /* printf("Returning bytes from buffer: %d - remaining: %d\n", size, ftdi->readbuffer_remaining); */ |
| 1075 | |
| 1076 | return size; |
| 1077 | } |
| 1078 | // something still in the readbuffer, but not enough to satisfy 'size'? |
| 1079 | if (ftdi->readbuffer_remaining != 0) { |
| 1080 | memcpy (buf, ftdi->readbuffer+ftdi->readbuffer_offset, ftdi->readbuffer_remaining); |
| 1081 | |
| 1082 | // Fix offset |
| 1083 | offset += ftdi->readbuffer_remaining; |
| 1084 | } |
| 1085 | // do the actual USB read |
| 1086 | while (offset < size && ret > 0) { |
| 1087 | ftdi->readbuffer_remaining = 0; |
| 1088 | ftdi->readbuffer_offset = 0; |
| 1089 | /* returns how much received */ |
| 1090 | ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout); |
| 1091 | if (ret < 0) |
| 1092 | ftdi_error_return(ret, "usb bulk read failed"); |
| 1093 | |
| 1094 | if (ret > 2) { |
| 1095 | // skip FTDI status bytes. |
| 1096 | // Maybe stored in the future to enable modem use |
| 1097 | num_of_chunks = ret / 64; |
| 1098 | chunk_remains = ret % 64; |
| 1099 | //printf("ret = %X, num_of_chunks = %X, chunk_remains = %X, readbuffer_offset = %X\n", ret, num_of_chunks, chunk_remains, ftdi->readbuffer_offset); |
| 1100 | |
| 1101 | ftdi->readbuffer_offset += 2; |
| 1102 | ret -= 2; |
| 1103 | |
| 1104 | if (ret > 62) { |
| 1105 | for (i = 1; i < num_of_chunks; i++) |
| 1106 | memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i, |
| 1107 | ftdi->readbuffer+ftdi->readbuffer_offset+64*i, |
| 1108 | 62); |
| 1109 | if (chunk_remains > 2) { |
| 1110 | memmove (ftdi->readbuffer+ftdi->readbuffer_offset+62*i, |
| 1111 | ftdi->readbuffer+ftdi->readbuffer_offset+64*i, |
| 1112 | chunk_remains-2); |
| 1113 | ret -= 2*num_of_chunks; |
| 1114 | } else |
| 1115 | ret -= 2*(num_of_chunks-1)+chunk_remains; |
| 1116 | } |
| 1117 | } else if (ret <= 2) { |
| 1118 | // no more data to read? |
| 1119 | return offset; |
| 1120 | } |
| 1121 | if (ret > 0) { |
| 1122 | // data still fits in buf? |
| 1123 | if (offset+ret <= size) { |
| 1124 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, ret); |
| 1125 | //printf("buf[0] = %X, buf[1] = %X\n", buf[0], buf[1]); |
| 1126 | offset += ret; |
| 1127 | |
| 1128 | /* Did we read exactly the right amount of bytes? */ |
| 1129 | if (offset == size) |
| 1130 | //printf("read_data exact rem %d offset %d\n", |
| 1131 | //ftdi->readbuffer_remaining, offset); |
| 1132 | return offset; |
| 1133 | } else { |
| 1134 | // only copy part of the data or size <= readbuffer_chunksize |
| 1135 | int part_size = size-offset; |
| 1136 | memcpy (buf+offset, ftdi->readbuffer+ftdi->readbuffer_offset, part_size); |
| 1137 | |
| 1138 | ftdi->readbuffer_offset += part_size; |
| 1139 | ftdi->readbuffer_remaining = ret-part_size; |
| 1140 | offset += part_size; |
| 1141 | |
| 1142 | /* printf("Returning part: %d - size: %d - offset: %d - ret: %d - remaining: %d\n", |
| 1143 | part_size, size, offset, ret, ftdi->readbuffer_remaining); */ |
| 1144 | |
| 1145 | return offset; |
| 1146 | } |
| 1147 | } |
| 1148 | } |
| 1149 | // never reached |
| 1150 | return -127; |
| 1151 | } |
| 1152 | |
| 1153 | /** |
| 1154 | Configure read buffer chunk size. |
| 1155 | Default is 4096. |
| 1156 | |
| 1157 | Automatically reallocates the buffer. |
| 1158 | |
| 1159 | \param ftdi pointer to ftdi_context |
| 1160 | \param chunksize Chunk size |
| 1161 | |
| 1162 | \retval 0: all fine |
| 1163 | */ |
| 1164 | int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) |
| 1165 | { |
| 1166 | unsigned char *new_buf; |
| 1167 | |
| 1168 | // Invalidate all remaining data |
| 1169 | ftdi->readbuffer_offset = 0; |
| 1170 | ftdi->readbuffer_remaining = 0; |
| 1171 | |
| 1172 | if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) |
| 1173 | ftdi_error_return(-1, "out of memory for readbuffer"); |
| 1174 | |
| 1175 | ftdi->readbuffer = new_buf; |
| 1176 | ftdi->readbuffer_chunksize = chunksize; |
| 1177 | |
| 1178 | return 0; |
| 1179 | } |
| 1180 | |
| 1181 | /** |
| 1182 | Get read buffer chunk size. |
| 1183 | |
| 1184 | \param ftdi pointer to ftdi_context |
| 1185 | \param chunksize Pointer to store chunk size in |
| 1186 | |
| 1187 | \retval 0: all fine |
| 1188 | */ |
| 1189 | int ftdi_read_data_get_chunksize(struct ftdi_context *ftdi, unsigned int *chunksize) |
| 1190 | { |
| 1191 | *chunksize = ftdi->readbuffer_chunksize; |
| 1192 | return 0; |
| 1193 | } |
| 1194 | |
| 1195 | |
| 1196 | /** |
| 1197 | Enable bitbang mode. |
| 1198 | |
| 1199 | For advanced bitbang modes of the FT2232C chip use ftdi_set_bitmode(). |
| 1200 | |
| 1201 | \param ftdi pointer to ftdi_context |
| 1202 | \param bitmask Bitmask to configure lines. |
| 1203 | HIGH/ON value configures a line as output. |
| 1204 | |
| 1205 | \retval 0: all fine |
| 1206 | \retval -1: can't enable bitbang mode |
| 1207 | */ |
| 1208 | int ftdi_enable_bitbang(struct ftdi_context *ftdi, unsigned char bitmask) |
| 1209 | { |
| 1210 | unsigned short usb_val; |
| 1211 | |
| 1212 | usb_val = bitmask; // low byte: bitmask |
| 1213 | /* FT2232C: Set bitbang_mode to 2 to enable SPI */ |
| 1214 | usb_val |= (ftdi->bitbang_mode << 8); |
| 1215 | |
| 1216 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1217 | ftdi_error_return(-1, "unable to enter bitbang mode. Perhaps not a BM type chip?"); |
| 1218 | |
| 1219 | ftdi->bitbang_enabled = 1; |
| 1220 | return 0; |
| 1221 | } |
| 1222 | |
| 1223 | /** |
| 1224 | Disable bitbang mode. |
| 1225 | |
| 1226 | \param ftdi pointer to ftdi_context |
| 1227 | |
| 1228 | \retval 0: all fine |
| 1229 | \retval -1: can't disable bitbang mode |
| 1230 | */ |
| 1231 | int ftdi_disable_bitbang(struct ftdi_context *ftdi) |
| 1232 | { |
| 1233 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, 0, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1234 | ftdi_error_return(-1, "unable to leave bitbang mode. Perhaps not a BM type chip?"); |
| 1235 | |
| 1236 | ftdi->bitbang_enabled = 0; |
| 1237 | return 0; |
| 1238 | } |
| 1239 | |
| 1240 | /** |
| 1241 | Enable advanced bitbang mode for FT2232C chips. |
| 1242 | |
| 1243 | \param ftdi pointer to ftdi_context |
| 1244 | \param bitmask Bitmask to configure lines. |
| 1245 | HIGH/ON value configures a line as output. |
| 1246 | \param mode Bitbang mode: 1 for normal mode, 2 for SPI mode |
| 1247 | |
| 1248 | \retval 0: all fine |
| 1249 | \retval -1: can't enable bitbang mode |
| 1250 | */ |
| 1251 | int ftdi_set_bitmode(struct ftdi_context *ftdi, unsigned char bitmask, unsigned char mode) |
| 1252 | { |
| 1253 | unsigned short usb_val; |
| 1254 | |
| 1255 | usb_val = bitmask; // low byte: bitmask |
| 1256 | usb_val |= (mode << 8); |
| 1257 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x0B, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1258 | ftdi_error_return(-1, "unable to configure bitbang mode. Perhaps not a 2232C type chip?"); |
| 1259 | |
| 1260 | ftdi->bitbang_mode = mode; |
| 1261 | ftdi->bitbang_enabled = (mode == BITMODE_BITBANG || mode == BITMODE_SYNCBB)?1:0; |
| 1262 | return 0; |
| 1263 | } |
| 1264 | |
| 1265 | /** |
| 1266 | Directly read pin state. Useful for bitbang mode. |
| 1267 | |
| 1268 | \param ftdi pointer to ftdi_context |
| 1269 | \param pins Pointer to store pins into |
| 1270 | |
| 1271 | \retval 0: all fine |
| 1272 | \retval -1: read pins failed |
| 1273 | */ |
| 1274 | int ftdi_read_pins(struct ftdi_context *ftdi, unsigned char *pins) |
| 1275 | { |
| 1276 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0C, 0, ftdi->index, (char *)pins, 1, ftdi->usb_read_timeout) != 1) |
| 1277 | ftdi_error_return(-1, "read pins failed"); |
| 1278 | |
| 1279 | return 0; |
| 1280 | } |
| 1281 | |
| 1282 | /** |
| 1283 | Set latency timer |
| 1284 | |
| 1285 | The FTDI chip keeps data in the internal buffer for a specific |
| 1286 | amount of time if the buffer is not full yet to decrease |
| 1287 | load on the usb bus. |
| 1288 | |
| 1289 | \param ftdi pointer to ftdi_context |
| 1290 | \param latency Value between 1 and 255 |
| 1291 | |
| 1292 | \retval 0: all fine |
| 1293 | \retval -1: latency out of range |
| 1294 | \retval -2: unable to set latency timer |
| 1295 | */ |
| 1296 | int ftdi_set_latency_timer(struct ftdi_context *ftdi, unsigned char latency) |
| 1297 | { |
| 1298 | unsigned short usb_val; |
| 1299 | |
| 1300 | if (latency < 1) |
| 1301 | ftdi_error_return(-1, "latency out of range. Only valid for 1-255"); |
| 1302 | |
| 1303 | usb_val = latency; |
| 1304 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x09, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1305 | ftdi_error_return(-2, "unable to set latency timer"); |
| 1306 | |
| 1307 | return 0; |
| 1308 | } |
| 1309 | |
| 1310 | /** |
| 1311 | Get latency timer |
| 1312 | |
| 1313 | \param ftdi pointer to ftdi_context |
| 1314 | \param latency Pointer to store latency value in |
| 1315 | |
| 1316 | \retval 0: all fine |
| 1317 | \retval -1: unable to get latency timer |
| 1318 | */ |
| 1319 | int ftdi_get_latency_timer(struct ftdi_context *ftdi, unsigned char *latency) |
| 1320 | { |
| 1321 | unsigned short usb_val; |
| 1322 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x0A, 0, ftdi->index, (char *)&usb_val, 1, ftdi->usb_read_timeout) != 1) |
| 1323 | ftdi_error_return(-1, "reading latency timer failed"); |
| 1324 | |
| 1325 | *latency = (unsigned char)usb_val; |
| 1326 | return 0; |
| 1327 | } |
| 1328 | |
| 1329 | /** |
| 1330 | Poll modem status information |
| 1331 | |
| 1332 | This function allows the retrieve the two status bytes of the device. |
| 1333 | The device sends these bytes also as a header for each read access |
| 1334 | where they are discarded by ftdi_read_data(). The chip generates |
| 1335 | the two stripped status bytes in the absence of data every 40 ms. |
| 1336 | |
| 1337 | Layout of the first byte: |
| 1338 | - B0..B3 - must be 0 |
| 1339 | - B4 Clear to send (CTS) |
| 1340 | 0 = inactive |
| 1341 | 1 = active |
| 1342 | - B5 Data set ready (DTS) |
| 1343 | 0 = inactive |
| 1344 | 1 = active |
| 1345 | - B6 Ring indicator (RI) |
| 1346 | 0 = inactive |
| 1347 | 1 = active |
| 1348 | - B7 Receive line signal detect (RLSD) |
| 1349 | 0 = inactive |
| 1350 | 1 = active |
| 1351 | |
| 1352 | Layout of the second byte: |
| 1353 | - B0 Data ready (DR) |
| 1354 | - B1 Overrun error (OE) |
| 1355 | - B2 Parity error (PE) |
| 1356 | - B3 Framing error (FE) |
| 1357 | - B4 Break interrupt (BI) |
| 1358 | - B5 Transmitter holding register (THRE) |
| 1359 | - B6 Transmitter empty (TEMT) |
| 1360 | - B7 Error in RCVR FIFO |
| 1361 | |
| 1362 | \param ftdi pointer to ftdi_context |
| 1363 | \param status Pointer to store status information in. Must be two bytes. |
| 1364 | |
| 1365 | \retval 0: all fine |
| 1366 | \retval -1: unable to retrieve status information |
| 1367 | */ |
| 1368 | int ftdi_poll_modem_status(struct ftdi_context *ftdi, unsigned short *status) |
| 1369 | { |
| 1370 | char usb_val[2]; |
| 1371 | |
| 1372 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x05, 0, ftdi->index, usb_val, 2, ftdi->usb_read_timeout) != 2) |
| 1373 | ftdi_error_return(-1, "getting modem status failed"); |
| 1374 | |
| 1375 | *status = (usb_val[1] << 8) | usb_val[0]; |
| 1376 | |
| 1377 | return 0; |
| 1378 | } |
| 1379 | |
| 1380 | /** |
| 1381 | Set the special event character |
| 1382 | |
| 1383 | \param ftdi pointer to ftdi_context |
| 1384 | \param eventch Event character |
| 1385 | \param enable 0 to disable the event character, non-zero otherwise |
| 1386 | |
| 1387 | \retval 0: all fine |
| 1388 | \retval -1: unable to set event character |
| 1389 | */ |
| 1390 | int ftdi_set_event_char(struct ftdi_context *ftdi, |
| 1391 | unsigned char eventch, unsigned char enable) |
| 1392 | { |
| 1393 | unsigned short usb_val; |
| 1394 | |
| 1395 | usb_val = eventch; |
| 1396 | if (enable) |
| 1397 | usb_val |= 1 << 8; |
| 1398 | |
| 1399 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x06, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1400 | ftdi_error_return(-1, "setting event character failed"); |
| 1401 | |
| 1402 | return 0; |
| 1403 | } |
| 1404 | |
| 1405 | /** |
| 1406 | Set error character |
| 1407 | |
| 1408 | \param ftdi pointer to ftdi_context |
| 1409 | \param errorch Error character |
| 1410 | \param enable 0 to disable the error character, non-zero otherwise |
| 1411 | |
| 1412 | \retval 0: all fine |
| 1413 | \retval -1: unable to set error character |
| 1414 | */ |
| 1415 | int ftdi_set_error_char(struct ftdi_context *ftdi, |
| 1416 | unsigned char errorch, unsigned char enable) |
| 1417 | { |
| 1418 | unsigned short usb_val; |
| 1419 | |
| 1420 | usb_val = errorch; |
| 1421 | if (enable) |
| 1422 | usb_val |= 1 << 8; |
| 1423 | |
| 1424 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x07, usb_val, ftdi->index, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1425 | ftdi_error_return(-1, "setting error character failed"); |
| 1426 | |
| 1427 | return 0; |
| 1428 | } |
| 1429 | |
| 1430 | /** |
| 1431 | Set the eeprom size |
| 1432 | |
| 1433 | \param ftdi pointer to ftdi_context |
| 1434 | \param eeprom Pointer to ftdi_eeprom |
| 1435 | \param size |
| 1436 | |
| 1437 | */ |
| 1438 | void ftdi_eeprom_setsize(struct ftdi_context *ftdi, struct ftdi_eeprom *eeprom, int size) |
| 1439 | { |
| 1440 | ftdi->eeprom_size=size; |
| 1441 | eeprom->size=size; |
| 1442 | } |
| 1443 | |
| 1444 | /** |
| 1445 | Init eeprom with default values. |
| 1446 | |
| 1447 | \param eeprom Pointer to ftdi_eeprom |
| 1448 | */ |
| 1449 | void ftdi_eeprom_initdefaults(struct ftdi_eeprom *eeprom) |
| 1450 | { |
| 1451 | eeprom->vendor_id = 0x0403; |
| 1452 | eeprom->product_id = 0x6001; |
| 1453 | |
| 1454 | eeprom->self_powered = 1; |
| 1455 | eeprom->remote_wakeup = 1; |
| 1456 | eeprom->BM_type_chip = 1; |
| 1457 | |
| 1458 | eeprom->in_is_isochronous = 0; |
| 1459 | eeprom->out_is_isochronous = 0; |
| 1460 | eeprom->suspend_pull_downs = 0; |
| 1461 | |
| 1462 | eeprom->use_serial = 0; |
| 1463 | eeprom->change_usb_version = 0; |
| 1464 | eeprom->usb_version = 0x0200; |
| 1465 | eeprom->max_power = 0; |
| 1466 | |
| 1467 | eeprom->manufacturer = NULL; |
| 1468 | eeprom->product = NULL; |
| 1469 | eeprom->serial = NULL; |
| 1470 | |
| 1471 | eeprom->size = FTDI_DEFAULT_EEPROM_SIZE; |
| 1472 | } |
| 1473 | |
| 1474 | /** |
| 1475 | Build binary output from ftdi_eeprom structure. |
| 1476 | Output is suitable for ftdi_write_eeprom(). |
| 1477 | |
| 1478 | \param eeprom Pointer to ftdi_eeprom |
| 1479 | \param output Buffer of 128 bytes to store eeprom image to |
| 1480 | |
| 1481 | \retval >0: used eeprom size |
| 1482 | \retval -1: eeprom size (128 bytes) exceeded by custom strings |
| 1483 | */ |
| 1484 | int ftdi_eeprom_build(struct ftdi_eeprom *eeprom, unsigned char *output) |
| 1485 | { |
| 1486 | unsigned char i, j; |
| 1487 | unsigned short checksum, value; |
| 1488 | unsigned char manufacturer_size = 0, product_size = 0, serial_size = 0; |
| 1489 | int size_check; |
| 1490 | |
| 1491 | if (eeprom->manufacturer != NULL) |
| 1492 | manufacturer_size = strlen(eeprom->manufacturer); |
| 1493 | if (eeprom->product != NULL) |
| 1494 | product_size = strlen(eeprom->product); |
| 1495 | if (eeprom->serial != NULL) |
| 1496 | serial_size = strlen(eeprom->serial); |
| 1497 | |
| 1498 | size_check = eeprom->size; |
| 1499 | size_check -= 28; // 28 are always in use (fixed) |
| 1500 | |
| 1501 | // Top half of a 256byte eeprom is used just for strings and checksum |
| 1502 | // it seems that the FTDI chip will not read these strings from the lower half |
| 1503 | // Each string starts with two bytes; offset and type (0x03 for string) |
| 1504 | // the checksum needs two bytes, so without the string data that 8 bytes from the top half |
| 1505 | if(eeprom->size>=256)size_check = 120; |
| 1506 | size_check -= manufacturer_size*2; |
| 1507 | size_check -= product_size*2; |
| 1508 | size_check -= serial_size*2; |
| 1509 | |
| 1510 | // eeprom size exceeded? |
| 1511 | if (size_check < 0) |
| 1512 | return (-1); |
| 1513 | |
| 1514 | // empty eeprom |
| 1515 | memset (output, 0, eeprom->size); |
| 1516 | |
| 1517 | // Addr 00: Stay 00 00 |
| 1518 | // Addr 02: Vendor ID |
| 1519 | output[0x02] = eeprom->vendor_id; |
| 1520 | output[0x03] = eeprom->vendor_id >> 8; |
| 1521 | |
| 1522 | // Addr 04: Product ID |
| 1523 | output[0x04] = eeprom->product_id; |
| 1524 | output[0x05] = eeprom->product_id >> 8; |
| 1525 | |
| 1526 | // Addr 06: Device release number (0400h for BM features) |
| 1527 | output[0x06] = 0x00; |
| 1528 | |
| 1529 | if (eeprom->BM_type_chip == 1) |
| 1530 | output[0x07] = 0x04; |
| 1531 | else |
| 1532 | output[0x07] = 0x02; |
| 1533 | |
| 1534 | // Addr 08: Config descriptor |
| 1535 | // Bit 7: always 1 |
| 1536 | // Bit 6: 1 if this device is self powered, 0 if bus powered |
| 1537 | // Bit 5: 1 if this device uses remote wakeup |
| 1538 | // Bit 4: 1 if this device is battery powered |
| 1539 | j = 0x80; |
| 1540 | if (eeprom->self_powered == 1) |
| 1541 | j |= 0x40; |
| 1542 | if (eeprom->remote_wakeup == 1) |
| 1543 | j |= 0x20; |
| 1544 | output[0x08] = j; |
| 1545 | |
| 1546 | // Addr 09: Max power consumption: max power = value * 2 mA |
| 1547 | output[0x09] = eeprom->max_power; |
| 1548 | |
| 1549 | // Addr 0A: Chip configuration |
| 1550 | // Bit 7: 0 - reserved |
| 1551 | // Bit 6: 0 - reserved |
| 1552 | // Bit 5: 0 - reserved |
| 1553 | // Bit 4: 1 - Change USB version |
| 1554 | // Bit 3: 1 - Use the serial number string |
| 1555 | // Bit 2: 1 - Enable suspend pull downs for lower power |
| 1556 | // Bit 1: 1 - Out EndPoint is Isochronous |
| 1557 | // Bit 0: 1 - In EndPoint is Isochronous |
| 1558 | // |
| 1559 | j = 0; |
| 1560 | if (eeprom->in_is_isochronous == 1) |
| 1561 | j = j | 1; |
| 1562 | if (eeprom->out_is_isochronous == 1) |
| 1563 | j = j | 2; |
| 1564 | if (eeprom->suspend_pull_downs == 1) |
| 1565 | j = j | 4; |
| 1566 | if (eeprom->use_serial == 1) |
| 1567 | j = j | 8; |
| 1568 | if (eeprom->change_usb_version == 1) |
| 1569 | j = j | 16; |
| 1570 | output[0x0A] = j; |
| 1571 | |
| 1572 | // Addr 0B: reserved |
| 1573 | output[0x0B] = 0x00; |
| 1574 | |
| 1575 | // Addr 0C: USB version low byte when 0x0A bit 4 is set |
| 1576 | // Addr 0D: USB version high byte when 0x0A bit 4 is set |
| 1577 | if (eeprom->change_usb_version == 1) { |
| 1578 | output[0x0C] = eeprom->usb_version; |
| 1579 | output[0x0D] = eeprom->usb_version >> 8; |
| 1580 | } |
| 1581 | |
| 1582 | |
| 1583 | // Addr 0E: Offset of the manufacturer string + 0x80, calculated later |
| 1584 | // Addr 0F: Length of manufacturer string |
| 1585 | output[0x0F] = manufacturer_size*2 + 2; |
| 1586 | |
| 1587 | // Addr 10: Offset of the product string + 0x80, calculated later |
| 1588 | // Addr 11: Length of product string |
| 1589 | output[0x11] = product_size*2 + 2; |
| 1590 | |
| 1591 | // Addr 12: Offset of the serial string + 0x80, calculated later |
| 1592 | // Addr 13: Length of serial string |
| 1593 | output[0x13] = serial_size*2 + 2; |
| 1594 | |
| 1595 | // Dynamic content |
| 1596 | i=0x14; |
| 1597 | if(eeprom->size>=256) i = 0x80; |
| 1598 | |
| 1599 | |
| 1600 | // Output manufacturer |
| 1601 | output[0x0E] = i | 0x80; // calculate offset |
| 1602 | output[i++] = manufacturer_size*2 + 2; |
| 1603 | output[i++] = 0x03; // type: string |
| 1604 | for (j = 0; j < manufacturer_size; j++) { |
| 1605 | output[i] = eeprom->manufacturer[j], i++; |
| 1606 | output[i] = 0x00, i++; |
| 1607 | } |
| 1608 | |
| 1609 | // Output product name |
| 1610 | output[0x10] = i | 0x80; // calculate offset |
| 1611 | output[i] = product_size*2 + 2, i++; |
| 1612 | output[i] = 0x03, i++; |
| 1613 | for (j = 0; j < product_size; j++) { |
| 1614 | output[i] = eeprom->product[j], i++; |
| 1615 | output[i] = 0x00, i++; |
| 1616 | } |
| 1617 | |
| 1618 | // Output serial |
| 1619 | output[0x12] = i | 0x80; // calculate offset |
| 1620 | output[i] = serial_size*2 + 2, i++; |
| 1621 | output[i] = 0x03, i++; |
| 1622 | for (j = 0; j < serial_size; j++) { |
| 1623 | output[i] = eeprom->serial[j], i++; |
| 1624 | output[i] = 0x00, i++; |
| 1625 | } |
| 1626 | |
| 1627 | // calculate checksum |
| 1628 | checksum = 0xAAAA; |
| 1629 | |
| 1630 | for (i = 0; i < eeprom->size/2-1; i++) { |
| 1631 | value = output[i*2]; |
| 1632 | value += output[(i*2)+1] << 8; |
| 1633 | |
| 1634 | checksum = value^checksum; |
| 1635 | checksum = (checksum << 1) | (checksum >> 15); |
| 1636 | } |
| 1637 | |
| 1638 | output[eeprom->size-2] = checksum; |
| 1639 | output[eeprom->size-1] = checksum >> 8; |
| 1640 | |
| 1641 | return size_check; |
| 1642 | } |
| 1643 | |
| 1644 | /** |
| 1645 | Read eeprom |
| 1646 | |
| 1647 | \param ftdi pointer to ftdi_context |
| 1648 | \param eeprom Pointer to store eeprom into |
| 1649 | |
| 1650 | \retval 0: all fine |
| 1651 | \retval -1: read failed |
| 1652 | */ |
| 1653 | int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) |
| 1654 | { |
| 1655 | int i; |
| 1656 | |
| 1657 | for (i = 0; i < ftdi->eeprom_size/2; i++) { |
| 1658 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) |
| 1659 | ftdi_error_return(-1, "reading eeprom failed"); |
| 1660 | } |
| 1661 | |
| 1662 | return 0; |
| 1663 | } |
| 1664 | |
| 1665 | /* |
| 1666 | ftdi_read_chipid_shift does the bitshift operation needed for the FTDIChip-ID |
| 1667 | Function is only used internally |
| 1668 | \internal |
| 1669 | */ |
| 1670 | static unsigned char ftdi_read_chipid_shift(unsigned char value) |
| 1671 | { |
| 1672 | return ((value & 1) << 1) | |
| 1673 | ((value & 2) << 5) | |
| 1674 | ((value & 4) >> 2) | |
| 1675 | ((value & 8) << 4) | |
| 1676 | ((value & 16) >> 1) | |
| 1677 | ((value & 32) >> 1) | |
| 1678 | ((value & 64) >> 4) | |
| 1679 | ((value & 128) >> 2); |
| 1680 | } |
| 1681 | |
| 1682 | /** |
| 1683 | Read the FTDIChip-ID from R-type devices |
| 1684 | |
| 1685 | \param ftdi pointer to ftdi_context |
| 1686 | \param chipid Pointer to store FTDIChip-ID |
| 1687 | |
| 1688 | \retval 0: all fine |
| 1689 | \retval -1: read failed |
| 1690 | */ |
| 1691 | int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid) |
| 1692 | { |
| 1693 | unsigned int a = 0, b = 0; |
| 1694 | |
| 1695 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, 0x43, (char *)&a, 2, ftdi->usb_read_timeout) == 2) |
| 1696 | { |
| 1697 | a = a << 8 | a >> 8; |
| 1698 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, 0x44, (char *)&b, 2, ftdi->usb_read_timeout) == 2) |
| 1699 | { |
| 1700 | b = b << 8 | b >> 8; |
| 1701 | a = (a << 16) | b; |
| 1702 | a = ftdi_read_chipid_shift(a) | ftdi_read_chipid_shift(a>>8)<<8 |
| 1703 | | ftdi_read_chipid_shift(a>>16)<<16 | ftdi_read_chipid_shift(a>>24)<<24; |
| 1704 | *chipid = a ^ 0xa5f0f7d1; |
| 1705 | return 0; |
| 1706 | } |
| 1707 | } |
| 1708 | |
| 1709 | ftdi_error_return(-1, "read of FTDIChip-ID failed"); |
| 1710 | } |
| 1711 | |
| 1712 | /** |
| 1713 | Guesses size of eeprom by reading eeprom and comparing halves - will not work with blank eeprom |
| 1714 | Call this function then do a write then call again to see if size changes, if so write again. |
| 1715 | |
| 1716 | \param ftdi pointer to ftdi_context |
| 1717 | \param eeprom Pointer to store eeprom into |
| 1718 | \param maxsize the size of the buffer to read into |
| 1719 | |
| 1720 | \retval size of eeprom |
| 1721 | */ |
| 1722 | int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize) |
| 1723 | { |
| 1724 | int i=0,j,minsize=32; |
| 1725 | int size=minsize; |
| 1726 | |
| 1727 | do{ |
| 1728 | for (j = 0; i < maxsize/2 && j<size; j++) { |
| 1729 | if (usb_control_msg(ftdi->usb_dev, 0xC0, 0x90, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2) |
| 1730 | ftdi_error_return(-1, "reading eeprom failed"); |
| 1731 | i++; |
| 1732 | } |
| 1733 | size*=2; |
| 1734 | }while(size<=maxsize && memcmp(eeprom,&eeprom[size/2],size/2)!=0); |
| 1735 | |
| 1736 | return size/2; |
| 1737 | } |
| 1738 | |
| 1739 | /** |
| 1740 | Write eeprom |
| 1741 | |
| 1742 | \param ftdi pointer to ftdi_context |
| 1743 | \param eeprom Pointer to read eeprom from |
| 1744 | |
| 1745 | \retval 0: all fine |
| 1746 | \retval -1: read failed |
| 1747 | */ |
| 1748 | int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom) |
| 1749 | { |
| 1750 | unsigned short usb_val; |
| 1751 | int i; |
| 1752 | |
| 1753 | for (i = 0; i < ftdi->eeprom_size/2; i++) { |
| 1754 | usb_val = eeprom[i*2]; |
| 1755 | usb_val += eeprom[(i*2)+1] << 8; |
| 1756 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x91, usb_val, i, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1757 | ftdi_error_return(-1, "unable to write eeprom"); |
| 1758 | } |
| 1759 | |
| 1760 | return 0; |
| 1761 | } |
| 1762 | |
| 1763 | /** |
| 1764 | Erase eeprom |
| 1765 | |
| 1766 | \param ftdi pointer to ftdi_context |
| 1767 | |
| 1768 | \retval 0: all fine |
| 1769 | \retval -1: erase failed |
| 1770 | */ |
| 1771 | int ftdi_erase_eeprom(struct ftdi_context *ftdi) |
| 1772 | { |
| 1773 | if (usb_control_msg(ftdi->usb_dev, 0x40, 0x92, 0, 0, NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1774 | ftdi_error_return(-1, "unable to erase eeprom"); |
| 1775 | |
| 1776 | return 0; |
| 1777 | } |
| 1778 | |
| 1779 | /** |
| 1780 | Get string representation for last error code |
| 1781 | |
| 1782 | \param ftdi pointer to ftdi_context |
| 1783 | |
| 1784 | \retval Pointer to error string |
| 1785 | */ |
| 1786 | char *ftdi_get_error_string (struct ftdi_context *ftdi) |
| 1787 | { |
| 1788 | return ftdi->error_str; |
| 1789 | } |
| 1790 | |
| 1791 | /* |
| 1792 | Flow control code by Lorenz Moesenlechner (lorenz@hcilab.org) |
| 1793 | and Matthias Kranz (matthias@hcilab.org) |
| 1794 | */ |
| 1795 | /** |
| 1796 | Set flowcontrol for ftdi chip |
| 1797 | |
| 1798 | \param ftdi pointer to ftdi_context |
| 1799 | \param flowctrl flow control to use. should be |
| 1800 | SIO_DISABLE_FLOW_CTRL, SIO_RTS_CTS_HS, SIO_DTR_DSR_HS or SIO_XON_XOFF_HS |
| 1801 | |
| 1802 | \retval 0: all fine |
| 1803 | \retval -1: set flow control failed |
| 1804 | */ |
| 1805 | int ftdi_setflowctrl(struct ftdi_context *ftdi, int flowctrl) |
| 1806 | { |
| 1807 | if (usb_control_msg(ftdi->usb_dev, SIO_SET_FLOW_CTRL_REQUEST_TYPE, |
| 1808 | SIO_SET_FLOW_CTRL_REQUEST, 0, (flowctrl | ftdi->interface), |
| 1809 | NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1810 | ftdi_error_return(-1, "set flow control failed"); |
| 1811 | |
| 1812 | return 0; |
| 1813 | } |
| 1814 | |
| 1815 | /** |
| 1816 | Set dtr line |
| 1817 | |
| 1818 | \param ftdi pointer to ftdi_context |
| 1819 | \param state state to set line to (1 or 0) |
| 1820 | |
| 1821 | \retval 0: all fine |
| 1822 | \retval -1: set dtr failed |
| 1823 | */ |
| 1824 | int ftdi_setdtr(struct ftdi_context *ftdi, int state) |
| 1825 | { |
| 1826 | unsigned short usb_val; |
| 1827 | |
| 1828 | if (state) |
| 1829 | usb_val = SIO_SET_DTR_HIGH; |
| 1830 | else |
| 1831 | usb_val = SIO_SET_DTR_LOW; |
| 1832 | |
| 1833 | if (usb_control_msg(ftdi->usb_dev, SIO_SET_MODEM_CTRL_REQUEST_TYPE, |
| 1834 | SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->interface, |
| 1835 | NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1836 | ftdi_error_return(-1, "set dtr failed"); |
| 1837 | |
| 1838 | return 0; |
| 1839 | } |
| 1840 | |
| 1841 | /** |
| 1842 | Set rts line |
| 1843 | |
| 1844 | \param ftdi pointer to ftdi_context |
| 1845 | \param state state to set line to (1 or 0) |
| 1846 | |
| 1847 | \retval 0: all fine |
| 1848 | \retval -1 set rts failed |
| 1849 | */ |
| 1850 | int ftdi_setrts(struct ftdi_context *ftdi, int state) |
| 1851 | { |
| 1852 | unsigned short usb_val; |
| 1853 | |
| 1854 | if (state) |
| 1855 | usb_val = SIO_SET_RTS_HIGH; |
| 1856 | else |
| 1857 | usb_val = SIO_SET_RTS_LOW; |
| 1858 | |
| 1859 | if (usb_control_msg(ftdi->usb_dev, SIO_SET_MODEM_CTRL_REQUEST_TYPE, |
| 1860 | SIO_SET_MODEM_CTRL_REQUEST, usb_val, ftdi->interface, |
| 1861 | NULL, 0, ftdi->usb_write_timeout) != 0) |
| 1862 | ftdi_error_return(-1, "set of rts failed"); |
| 1863 | |
| 1864 | return 0; |
| 1865 | } |
| 1866 | |
| 1867 | /* @} end of doxygen libftdi group */ |