hardware/fx2lafw/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "protocol.h"
  22
  23 /* Protocol commands */
  24 #define CMD_GET_FW_VERSION              0xb0
  25 #define CMD_START                       0xb1
  26 #define CMD_GET_REVID_VERSION           0xb2
  27
  28 #define CMD_START_FLAGS_WIDE_POS        5
  29 #define CMD_START_FLAGS_CLK_SRC_POS     6
  30
  31 #define CMD_START_FLAGS_SAMPLE_8BIT     (0 << CMD_START_FLAGS_WIDE_POS)
  32 #define CMD_START_FLAGS_SAMPLE_16BIT    (1 << CMD_START_FLAGS_WIDE_POS)
  33
  34 #define CMD_START_FLAGS_CLK_30MHZ       (0 << CMD_START_FLAGS_CLK_SRC_POS)
  35 #define CMD_START_FLAGS_CLK_48MHZ       (1 << CMD_START_FLAGS_CLK_SRC_POS)
  36
  37 #pragma pack(push, 1)
  38
  39 struct version_info {
  40         uint8_t major;
  41         uint8_t minor;
  42 };
  43
  44 struct cmd_start_acquisition {
  45         uint8_t flags;
  46         uint8_t sample_delay_h;
  47         uint8_t sample_delay_l;
  48 };
  49
  50 #pragma pack(pop)
  51
  52 static int command_get_fw_version(libusb_device_handle *devhdl,
  53                                   struct version_info *vi)
  54 {
  55         int ret;
  56
  57         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
  58                 LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
  59                 (unsigned char *)vi, sizeof(struct version_info), 100);
  60
  61         if (ret < 0) {
  62                 sr_err("Unable to get version info: %s.",
  63                        libusb_error_name(ret));
  64                 return SR_ERR;
  65         }
  66
  67         return SR_OK;
  68 }
  69
  70 static int command_get_revid_version(libusb_device_handle *devhdl,
  71                                      uint8_t *revid)
  72 {
  73         int ret;
  74
  75         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
  76                 LIBUSB_ENDPOINT_IN, CMD_GET_REVID_VERSION, 0x0000, 0x0000,
  77                 revid, 1, 100);
  78
  79         if (ret < 0) {
  80                 sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
  81                 return SR_ERR;
  82         }
  83
  84         return SR_OK;
  85 }
  86
  87 SR_PRIV int fx2lafw_command_start_acquisition(libusb_device_handle *devhdl,
  88                 uint64_t samplerate, gboolean samplewide)
  89 {
  90         struct cmd_start_acquisition cmd;
  91         int delay = 0, ret;
  92
  93         /* Compute the sample rate. */
  94         if (samplewide && samplerate > MAX_16BIT_SAMPLE_RATE) {
  95                 sr_err("Unable to sample at %" PRIu64 "Hz "
  96                        "when collecting 16-bit samples.", samplerate);
  97                 return SR_ERR;
  98         }
  99
 100         if ((SR_MHZ(48) % samplerate) == 0) {
 101                 cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
 102                 delay = SR_MHZ(48) / samplerate - 1;
 103                 if (delay > MAX_SAMPLE_DELAY)
 104                         delay = 0;
 105         }
 106
 107         if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
 108                 cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
 109                 delay = SR_MHZ(30) / samplerate - 1;
 110         }
 111
 112         sr_info("GPIF delay = %d, clocksource = %sMHz.", delay,
 113                 (cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
 114
 115         if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
 116                 sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
 117                 return SR_ERR;
 118         }
 119
 120         cmd.sample_delay_h = (delay >> 8) & 0xff;
 121         cmd.sample_delay_l = delay & 0xff;
 122
 123         /* Select the sampling width. */
 124         cmd.flags |= samplewide ? CMD_START_FLAGS_SAMPLE_16BIT :
 125                 CMD_START_FLAGS_SAMPLE_8BIT;
 126
 127         /* Send the control message. */
 128         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 129                         LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
 130                         (unsigned char *)&cmd, sizeof(cmd), 100);
 131         if (ret < 0) {
 132                 sr_err("Unable to send start command: %s.",
 133                        libusb_error_name(ret));
 134                 return SR_ERR;
 135         }
 136
 137         return SR_OK;
 138 }
 139
 140 /**
 141  * Check the USB configuration to determine if this is an fx2lafw device.
 142  *
 143  * @return TRUE if the device's configuration profile match fx2lafw
 144  *         configuration, FALSE otherwise.
 145  */
 146 SR_PRIV gboolean fx2lafw_check_conf_profile(libusb_device *dev)
 147 {
 148         struct libusb_device_descriptor des;
 149         struct libusb_device_handle *hdl;
 150         gboolean ret;
 151         unsigned char strdesc[64];
 152
 153         hdl = NULL;
 154         ret = FALSE;
 155         while (!ret) {
 156                 /* Assume the FW has not been loaded, unless proven wrong. */
 157                 if (libusb_get_device_descriptor(dev, &des) != 0)
 158                         break;
 159
 160                 if (libusb_open(dev, &hdl) != 0)
 161                         break;
 162
 163                 if (libusb_get_string_descriptor_ascii(hdl,
 164                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 165                         break;
 166                 if (strncmp((const char *)strdesc, "sigrok", 6))
 167                         break;
 168
 169                 if (libusb_get_string_descriptor_ascii(hdl,
 170                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 171                         break;
 172                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 173                         break;
 174
 175                 /* If we made it here, it must be an fx2lafw. */
 176                 ret = TRUE;
 177         }
 178         if (hdl)
 179                 libusb_close(hdl);
 180
 181         return ret;
 182 }
 183
 184 SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 185 {
 186         libusb_device **devlist;
 187         struct sr_usb_dev_inst *usb;
 188         struct libusb_device_descriptor des;
 189         struct dev_context *devc;
 190         struct drv_context *drvc;
 191         struct version_info vi;
 192         int ret, skip, i, device_count;
 193         uint8_t revid;
 194
 195         drvc = di->priv;
 196         devc = sdi->priv;
 197         usb = sdi->conn;
 198
 199         if (sdi->status == SR_ST_ACTIVE)
 200                 /* Device is already in use. */
 201                 return SR_ERR;
 202
 203         skip = 0;
 204         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 205         if (device_count < 0) {
 206                 sr_err("Failed to get device list: %s.",
 207                        libusb_error_name(device_count));
 208                 return SR_ERR;
 209         }
 210
 211         for (i = 0; i < device_count; i++) {
 212                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 213                         sr_err("Failed to get device descriptor: %s.",
 214                                libusb_error_name(ret));
 215                         continue;
 216                 }
 217
 218                 if (des.idVendor != devc->profile->vid
 219                     || des.idProduct != devc->profile->pid)
 220                         continue;
 221
 222                 if (sdi->status == SR_ST_INITIALIZING) {
 223                         if (skip != sdi->index) {
 224                                 /* Skip devices of this type that aren't the one we want. */
 225                                 skip += 1;
 226                                 continue;
 227                         }
 228                 } else if (sdi->status == SR_ST_INACTIVE) {
 229                         /*
 230                          * This device is fully enumerated, so we need to find
 231                          * this device by vendor, product, bus and address.
 232                          */
 233                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 234                                 || libusb_get_device_address(devlist[i]) != usb->address)
 235                                 /* This is not the one. */
 236                                 continue;
 237                 }
 238
 239                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 240                         if (usb->address == 0xff)
 241                                 /*
 242                                  * First time we touch this device after FW
 243                                  * upload, so we don't know the address yet.
 244                                  */
 245                                 usb->address = libusb_get_device_address(devlist[i]);
 246                 } else {
 247                         sr_err("Failed to open device: %s.",
 248                                libusb_error_name(ret));
 249                         break;
 250                 }
 251
 252                 ret = command_get_fw_version(usb->devhdl, &vi);
 253                 if (ret != SR_OK) {
 254                         sr_err("Failed to get firmware version.");
 255                         break;
 256                 }
 257
 258                 ret = command_get_revid_version(usb->devhdl, &revid);
 259                 if (ret != SR_OK) {
 260                         sr_err("Failed to get REVID.");
 261                         break;
 262                 }
 263
 264                 /*
 265                  * Changes in major version mean incompatible/API changes, so
 266                  * bail out if we encounter an incompatible version.
 267                  * Different minor versions are OK, they should be compatible.
 268                  */
 269                 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
 270                         sr_err("Expected firmware version %d.x, "
 271                                "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
 272                                vi.major, vi.minor);
 273                         break;
 274                 }
 275
 276                 sdi->status = SR_ST_ACTIVE;
 277                 sr_info("Opened device %d on %d.%d, "
 278                         "interface %d, firmware %d.%d.",
 279                         sdi->index, usb->bus, usb->address,
 280                         USB_INTERFACE, vi.major, vi.minor);
 281
 282                 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
 283                         revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
 284
 285                 break;
 286         }
 287         libusb_free_device_list(devlist, 1);
 288
 289         if (sdi->status != SR_ST_ACTIVE)
 290                 return SR_ERR;
 291
 292         return SR_OK;
 293 }
 294
 295 SR_PRIV int fx2lafw_configure_channels(const struct sr_dev_inst *sdi)
 296 {
 297         struct dev_context *devc;
 298         struct sr_channel *ch;
 299         GSList *l;
 300         int channel_bit, stage, i;
 301         char *tc;
 302
 303         devc = sdi->priv;
 304         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 305                 devc->trigger_mask[i] = 0;
 306                 devc->trigger_value[i] = 0;
 307         }
 308
 309         stage = -1;
 310         for (l = sdi->channels; l; l = l->next) {
 311                 ch = (struct sr_channel *)l->data;
 312                 if (ch->enabled == FALSE)
 313                         continue;
 314
 315                 if (ch->index > 7)
 316                         devc->sample_wide = TRUE;
 317
 318                 channel_bit = 1 << (ch->index);
 319                 if (!(ch->trigger))
 320                         continue;
 321
 322                 stage = 0;
 323                 for (tc = ch->trigger; *tc; tc++) {
 324                         devc->trigger_mask[stage] |= channel_bit;
 325                         if (*tc == '1')
 326                                 devc->trigger_value[stage] |= channel_bit;
 327                         stage++;
 328                         if (stage > NUM_TRIGGER_STAGES)
 329                                 return SR_ERR;
 330                 }
 331         }
 332
 333         if (stage == -1)
 334                 /*
 335                  * We didn't configure any triggers, make sure acquisition
 336                  * doesn't wait for any.
 337                  */
 338                 devc->trigger_stage = TRIGGER_FIRED;
 339         else
 340                 devc->trigger_stage = 0;
 341
 342         return SR_OK;
 343 }
 344
 345 SR_PRIV struct dev_context *fx2lafw_dev_new(void)
 346 {
 347         struct dev_context *devc;
 348
 349         if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
 350                 sr_err("Device context malloc failed.");
 351                 return NULL;
 352         }
 353
 354         devc->profile = NULL;
 355         devc->fw_updated = 0;
 356         devc->cur_samplerate = 0;
 357         devc->limit_samples = 0;
 358         devc->sample_wide = FALSE;
 359
 360         return devc;
 361 }
 362
 363 SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc)
 364 {
 365         int i;
 366
 367         devc->num_samples = -1;
 368
 369         for (i = devc->num_transfers - 1; i >= 0; i--) {
 370                 if (devc->transfers[i])
 371                         libusb_cancel_transfer(devc->transfers[i]);
 372         }
 373 }
 374
 375 static void finish_acquisition(struct dev_context *devc)
 376 {
 377         struct sr_datafeed_packet packet;
 378
 379         /* Terminate session. */
 380         packet.type = SR_DF_END;
 381         sr_session_send(devc->cb_data, &packet);
 382
 383         /* Remove fds from polling. */
 384         usb_source_remove(devc->ctx);
 385
 386         devc->num_transfers = 0;
 387         g_free(devc->transfers);
 388 }
 389
 390 static void free_transfer(struct libusb_transfer *transfer)
 391 {
 392         struct dev_context *devc;
 393         unsigned int i;
 394
 395         devc = transfer->user_data;
 396
 397         g_free(transfer->buffer);
 398         transfer->buffer = NULL;
 399         libusb_free_transfer(transfer);
 400
 401         for (i = 0; i < devc->num_transfers; i++) {
 402                 if (devc->transfers[i] == transfer) {
 403                         devc->transfers[i] = NULL;
 404                         break;
 405                 }
 406         }
 407
 408         devc->submitted_transfers--;
 409         if (devc->submitted_transfers == 0)
 410                 finish_acquisition(devc);
 411 }
 412
 413 static void resubmit_transfer(struct libusb_transfer *transfer)
 414 {
 415         int ret;
 416
 417         if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
 418                 return;
 419
 420         free_transfer(transfer);
 421         /* TODO: Stop session? */
 422
 423         sr_err("%s: %s", __func__, libusb_error_name(ret));
 424 }
 425
 426 SR_PRIV void fx2lafw_receive_transfer(struct libusb_transfer *transfer)
 427 {
 428         gboolean packet_has_error = FALSE;
 429         struct sr_datafeed_packet packet;
 430         struct sr_datafeed_logic logic;
 431         struct dev_context *devc;
 432         int trigger_offset, i, sample_width, cur_sample_count;
 433         int trigger_offset_bytes;
 434         uint8_t *cur_buf;
 435         uint16_t cur_sample;
 436
 437         devc = transfer->user_data;
 438
 439         /*
 440          * If acquisition has already ended, just free any queued up
 441          * transfer that come in.
 442          */
 443         if (devc->num_samples == -1) {
 444                 free_transfer(transfer);
 445                 return;
 446         }
 447
 448         sr_info("receive_transfer(): status %d received %d bytes.",
 449                 transfer->status, transfer->actual_length);
 450
 451         /* Save incoming transfer before reusing the transfer struct. */
 452         cur_buf = transfer->buffer;
 453         sample_width = devc->sample_wide ? 2 : 1;
 454         cur_sample_count = transfer->actual_length / sample_width;
 455
 456         switch (transfer->status) {
 457         case LIBUSB_TRANSFER_NO_DEVICE:
 458                 fx2lafw_abort_acquisition(devc);
 459                 free_transfer(transfer);
 460                 return;
 461         case LIBUSB_TRANSFER_COMPLETED:
 462         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
 463                 break;
 464         default:
 465                 packet_has_error = TRUE;
 466                 break;
 467         }
 468
 469         if (transfer->actual_length == 0 || packet_has_error) {
 470                 devc->empty_transfer_count++;
 471                 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 472                         /*
 473                          * The FX2 gave up. End the acquisition, the frontend
 474                          * will work out that the samplecount is short.
 475                          */
 476                         fx2lafw_abort_acquisition(devc);
 477                         free_transfer(transfer);
 478                 } else {
 479                         resubmit_transfer(transfer);
 480                 }
 481                 return;
 482         } else {
 483                 devc->empty_transfer_count = 0;
 484         }
 485
 486         trigger_offset = 0;
 487         if (devc->trigger_stage >= 0) {
 488                 for (i = 0; i < cur_sample_count; i++) {
 489
 490                         cur_sample = devc->sample_wide ?
 491                                 *((uint16_t *)cur_buf + i) :
 492                                 *((uint8_t *)cur_buf + i);
 493
 494                         if ((cur_sample & devc->trigger_mask[devc->trigger_stage]) ==
 495                                 devc->trigger_value[devc->trigger_stage]) {
 496                                 /* Match on this trigger stage. */
 497                                 devc->trigger_buffer[devc->trigger_stage] = cur_sample;
 498                                 devc->trigger_stage++;
 499
 500                                 if (devc->trigger_stage == NUM_TRIGGER_STAGES ||
 501                                         devc->trigger_mask[devc->trigger_stage] == 0) {
 502                                         /* Match on all trigger stages, we're done. */
 503                                         trigger_offset = i + 1;
 504
 505                                         /*
 506                                          * TODO: Send pre-trigger buffer to session bus.
 507                                          * Tell the frontend we hit the trigger here.
 508                                          */
 509                                         packet.type = SR_DF_TRIGGER;
 510                                         packet.payload = NULL;
 511                                         sr_session_send(devc->cb_data, &packet);
 512
 513                                         /*
 514                                          * Send the samples that triggered it,
 515                                          * since we're skipping past them.
 516                                          */
 517                                         packet.type = SR_DF_LOGIC;
 518                                         packet.payload = &logic;
 519                                         logic.unitsize = sample_width;
 520                                         logic.length = devc->trigger_stage * logic.unitsize;
 521                                         logic.data = devc->trigger_buffer;
 522                                         sr_session_send(devc->cb_data, &packet);
 523
 524                                         devc->trigger_stage = TRIGGER_FIRED;
 525                                         break;
 526                                 }
 527                         } else if (devc->trigger_stage > 0) {
 528                                 /*
 529                                  * We had a match before, but not in the next sample. However, we may
 530                                  * have a match on this stage in the next bit -- trigger on 0001 will
 531                                  * fail on seeing 00001, so we need to go back to stage 0 -- but at
 532                                  * the next sample from the one that matched originally, which the
 533                                  * counter increment at the end of the loop takes care of.
 534                                  */
 535                                 i -= devc->trigger_stage;
 536                                 if (i < -1)
 537                                         i = -1; /* Oops, went back past this buffer. */
 538                                 /* Reset trigger stage. */
 539                                 devc->trigger_stage = 0;
 540                         }
 541                 }
 542         }
 543
 544         if (devc->trigger_stage == TRIGGER_FIRED) {
 545                 /* Send the incoming transfer to the session bus. */
 546                 trigger_offset_bytes = trigger_offset * sample_width;
 547                 packet.type = SR_DF_LOGIC;
 548                 packet.payload = &logic;
 549                 logic.length = transfer->actual_length - trigger_offset_bytes;
 550                 logic.unitsize = sample_width;
 551                 logic.data = cur_buf + trigger_offset_bytes;
 552                 sr_session_send(devc->cb_data, &packet);
 553
 554                 devc->num_samples += cur_sample_count;
 555                 if (devc->limit_samples &&
 556                         (unsigned int)devc->num_samples > devc->limit_samples) {
 557                         fx2lafw_abort_acquisition(devc);
 558                         free_transfer(transfer);
 559                         return;
 560                 }
 561         } else {
 562                 /*
 563                  * TODO: Buffer pre-trigger data in capture
 564                  * ratio-sized buffer.
 565                  */
 566         }
 567
 568         resubmit_transfer(transfer);
 569 }
 570
 571 static unsigned int to_bytes_per_ms(unsigned int samplerate)
 572 {
 573         return samplerate / 1000;
 574 }
 575
 576 SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc)
 577 {
 578         size_t s;
 579
 580         /*
 581          * The buffer should be large enough to hold 10ms of data and
 582          * a multiple of 512.
 583          */
 584         s = 10 * to_bytes_per_ms(devc->cur_samplerate);
 585         return (s + 511) & ~511;
 586 }
 587
 588 SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc)
 589 {
 590         unsigned int n;
 591
 592         /* Total buffer size should be able to hold about 500ms of data. */
 593         n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
 594                 fx2lafw_get_buffer_size(devc));
 595
 596         if (n > NUM_SIMUL_TRANSFERS)
 597                 return NUM_SIMUL_TRANSFERS;
 598
 599         return n;
 600 }
 601
 602 SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc)
 603 {
 604         size_t total_size;
 605         unsigned int timeout;
 606
 607         total_size = fx2lafw_get_buffer_size(devc) *
 608                         fx2lafw_get_number_of_transfers(devc);
 609         timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
 610         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 611 }