src/hardware/pipistrello-ols/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include "protocol.h"
  22
  23 SR_PRIV int write_shortcommand(struct dev_context *devc, uint8_t command)
  24 {
  25         uint8_t buf[1];
  26         int bytes_written;
  27
  28         sr_dbg("Sending cmd 0x%.2x.", command);
  29         buf[0] = command;
  30         bytes_written = ftdi_write_data(devc->ftdic, buf, 1);
  31         if (bytes_written < 0) {
  32                 sr_err("Failed to write FTDI data (%d): %s.",
  33                        bytes_written, ftdi_get_error_string(devc->ftdic));
  34                 return SR_ERR;
  35         } else if (bytes_written != 1) {
  36                 sr_err("FTDI write error, only %d/%d bytes written: %s.",
  37                        bytes_written, 1, ftdi_get_error_string(devc->ftdic));
  38                 return SR_ERR;
  39         }
  40
  41         return SR_OK;
  42 }
  43
  44 SR_PRIV int write_longcommand(struct dev_context *devc, uint8_t command, uint8_t *data)
  45 {
  46         uint8_t buf[5];
  47         int bytes_written;
  48
  49         sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
  50                         data[0], data[1], data[2], data[3]);
  51         buf[0] = command;
  52         buf[1] = data[0];
  53         buf[2] = data[1];
  54         buf[3] = data[2];
  55         buf[4] = data[3];
  56         bytes_written = ftdi_write_data(devc->ftdic, buf, 5);
  57         if (bytes_written < 0) {
  58                 sr_err("Failed to write FTDI data (%d): %s.",
  59                        bytes_written, ftdi_get_error_string(devc->ftdic));
  60                 return SR_ERR;
  61         } else if (bytes_written != 5) {
  62                 sr_err("FTDI write error, only %d/%d bytes written: %s.",
  63                        bytes_written, 1, ftdi_get_error_string(devc->ftdic));
  64                 return SR_ERR;
  65         }
  66
  67         return SR_OK;
  68 }
  69
  70 SR_PRIV int p_ols_open(struct dev_context *devc)
  71 {
  72         int ret;
  73
  74         /* Note: Caller checks devc and devc->ftdic. */
  75
  76         /* Select interface B, otherwise communication will fail. */
  77         ret = ftdi_set_interface(devc->ftdic, INTERFACE_B);
  78         if (ret < 0) {
  79                 sr_err("Failed to set FTDI interface B (%d): %s", ret,
  80                        ftdi_get_error_string(devc->ftdic));
  81                 return SR_ERR;
  82         }
  83
  84         /* Check for the device and temporarily open it. */
  85         ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID, USB_DEVICE_ID,
  86                                  USB_IPRODUCT, NULL);
  87         if (ret < 0) {
  88                 /* Log errors, except for -3 ("device not found"). */
  89                 if (ret != -3)
  90                         sr_err("Failed to open device (%d): %s", ret,
  91                                ftdi_get_error_string(devc->ftdic));
  92                 return SR_ERR;
  93         }
  94
  95         /* Purge RX/TX buffers in the FTDI chip. */
  96         if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
  97                 sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
  98                        ret, ftdi_get_error_string(devc->ftdic));
  99                 goto err_open_close_ftdic;
 100         }
 101
 102         /* Reset the FTDI bitmode. */
 103         ret = ftdi_set_bitmode(devc->ftdic, 0xff, BITMODE_RESET);
 104         if (ret < 0) {
 105                 sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
 106                        ret, ftdi_get_error_string(devc->ftdic));
 107                 goto err_open_close_ftdic;
 108         }
 109
 110         /* Set the FTDI latency timer to 16. */
 111         ret = ftdi_set_latency_timer(devc->ftdic, 16);
 112         if (ret < 0) {
 113                 sr_err("Failed to set FTDI latency timer (%d): %s.",
 114                        ret, ftdi_get_error_string(devc->ftdic));
 115                 goto err_open_close_ftdic;
 116         }
 117
 118         /* Set the FTDI read data chunk size to 64kB. */
 119         ret = ftdi_read_data_set_chunksize(devc->ftdic, 64 * 1024);
 120         if (ret < 0) {
 121                 sr_err("Failed to set FTDI read data chunk size (%d): %s.",
 122                        ret, ftdi_get_error_string(devc->ftdic));
 123                 goto err_open_close_ftdic;
 124         }
 125
 126         return SR_OK;
 127
 128 err_open_close_ftdic:
 129         ftdi_usb_close(devc->ftdic);
 130
 131         return SR_ERR;
 132 }
 133
 134 SR_PRIV int p_ols_close(struct dev_context *devc)
 135 {
 136         int ret;
 137
 138         /* Note: Caller checks devc and devc->ftdic. */
 139
 140         if ((ret = ftdi_usb_close(devc->ftdic)) < 0) {
 141                 sr_err("Failed to close FTDI device (%d): %s.",
 142                        ret, ftdi_get_error_string(devc->ftdic));
 143                 return SR_ERR;
 144         }
 145
 146         return SR_OK;
 147 }
 148
 149 /* Configures the channel mask based on which channels are enabled. */
 150 SR_PRIV void pols_channel_mask(const struct sr_dev_inst *sdi)
 151 {
 152         struct dev_context *devc;
 153         struct sr_channel *channel;
 154         const GSList *l;
 155
 156         devc = sdi->priv;
 157
 158         devc->channel_mask = 0;
 159         for (l = sdi->channels; l; l = l->next) {
 160                 channel = l->data;
 161                 if (channel->enabled)
 162                         devc->channel_mask |= 1 << channel->index;
 163         }
 164 }
 165
 166 SR_PRIV int pols_convert_trigger(const struct sr_dev_inst *sdi)
 167 {
 168         struct dev_context *devc;
 169         struct sr_trigger *trigger;
 170         struct sr_trigger_stage *stage;
 171         struct sr_trigger_match *match;
 172         const GSList *l, *m;
 173         int i;
 174
 175         devc = sdi->priv;
 176
 177         devc->num_stages = 0;
 178         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 179                 devc->trigger_mask[i] = 0;
 180                 devc->trigger_value[i] = 0;
 181                 devc->trigger_edge[i] = 0;
 182         }
 183
 184         if (!(trigger = sr_session_trigger_get(sdi->session)))
 185                 return SR_OK;
 186
 187         devc->num_stages = g_slist_length(trigger->stages);
 188         if (devc->num_stages > NUM_TRIGGER_STAGES) {
 189                 sr_err("This device only supports %d trigger stages.",
 190                                 NUM_TRIGGER_STAGES);
 191                 return SR_ERR;
 192         }
 193
 194         for (l = trigger->stages; l; l = l->next) {
 195                 stage = l->data;
 196                 for (m = stage->matches; m; m = m->next) {
 197                         match = m->data;
 198                         if (!match->channel->enabled)
 199                                 /* Ignore disabled channels with a trigger. */
 200                                 continue;
 201                         devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
 202                         if (match->match == SR_TRIGGER_ONE || match->match == SR_TRIGGER_RISING)
 203                                 devc->trigger_value[stage->stage] |= 1 << match->channel->index;
 204                         if (match->match == SR_TRIGGER_RISING || match->match == SR_TRIGGER_FALLING)
 205                                 devc->trigger_edge[stage->stage] |= 1 << match->channel->index;
 206                 }
 207         }
 208
 209         return SR_OK;
 210 }
 211
 212 SR_PRIV struct sr_dev_inst *p_ols_get_metadata(uint8_t *buf, int bytes_read, struct dev_context *devc)
 213 {
 214         struct sr_dev_inst *sdi;
 215         uint32_t tmp_int, ui;
 216         uint8_t key, type, token;
 217         GString *tmp_str, *devname, *version;
 218         guchar tmp_c;
 219         int index, i;
 220
 221         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 222         sdi->status = SR_ST_INACTIVE;
 223         sdi->priv = devc;
 224
 225         devname = g_string_new("");
 226         version = g_string_new("");
 227
 228         index = 0;
 229         while (index < bytes_read) {
 230                 key = buf[index++];
 231                 if (key == 0x00) {
 232                         sr_dbg("Got metadata key 0x00, metadata ends.");
 233                         break;
 234                 }
 235                 type = key >> 5;
 236                 token = key & 0x1f;
 237                 switch (type) {
 238                 case 0:
 239                         /* NULL-terminated string */
 240                         tmp_str = g_string_new("");
 241                         while ((index < bytes_read) && ((tmp_c = buf[index++]) != '\0'))
 242                                 g_string_append_c(tmp_str, tmp_c);
 243                         sr_dbg("Got metadata key 0x%.2x value '%s'.",
 244                                key, tmp_str->str);
 245                         switch (token) {
 246                         case 0x01:
 247                                 /* Device name */
 248                                 devname = g_string_append(devname, tmp_str->str);
 249                                 break;
 250                         case 0x02:
 251                                 /* FPGA firmware version */
 252                                 if (version->len)
 253                                         g_string_append(version, ", ");
 254                                 g_string_append(version, "FPGA version ");
 255                                 g_string_append(version, tmp_str->str);
 256                                 break;
 257                         case 0x03:
 258                                 /* Ancillary version */
 259                                 if (version->len)
 260                                         g_string_append(version, ", ");
 261                                 g_string_append(version, "Ancillary version ");
 262                                 g_string_append(version, tmp_str->str);
 263                                 break;
 264                         default:
 265                                 sr_info("Unknown token 0x%.2x: '%s'",
 266                                         token, tmp_str->str);
 267                                 break;
 268                         }
 269                         g_string_free(tmp_str, TRUE);
 270                         break;
 271                 case 1:
 272                         /* 32-bit unsigned integer */
 273                         tmp_int = 0;
 274                         for (i = 0; i < 4; i++) {
 275                                 tmp_int = (tmp_int << 8) | buf[index++];
 276                         }
 277                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 278                                key, tmp_int);
 279                         switch (token) {
 280                         case 0x00:
 281                                 /* Number of usable channels */
 282                                 for (ui = 0; ui < tmp_int; ui++)
 283                                         sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
 284                                                         p_ols_channel_names[ui]);
 285                                 break;
 286                         case 0x01:
 287                                 /* Amount of sample memory available (bytes) */
 288                                 devc->max_samplebytes = tmp_int;
 289                                 break;
 290                         case 0x02:
 291                                 /* Amount of dynamic memory available (bytes) */
 292                                 /* what is this for? */
 293                                 break;
 294                         case 0x03:
 295                                 /* Maximum sample rate (Hz) */
 296                                 devc->max_samplerate = tmp_int;
 297                                 break;
 298                         case 0x04:
 299                                 /* protocol version */
 300                                 devc->protocol_version = tmp_int;
 301                                 break;
 302                         default:
 303                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 304                                         token, tmp_int);
 305                                 break;
 306                         }
 307                         break;
 308                 case 2:
 309                         /* 8-bit unsigned integer */
 310                         tmp_c = buf[index++];
 311                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 312                                key, tmp_c);
 313                         switch (token) {
 314                         case 0x00:
 315                                 /* Number of usable channels */
 316                                 for (ui = 0; ui < tmp_c; ui++)
 317                                         sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
 318                                                         p_ols_channel_names[ui]);
 319                                 break;
 320                         case 0x01:
 321                                 /* protocol version */
 322                                 devc->protocol_version = tmp_c;
 323                                 break;
 324                         default:
 325                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 326                                         token, tmp_c);
 327                                 break;
 328                         }
 329                         break;
 330                 default:
 331                         /* unknown type */
 332                         break;
 333                 }
 334         }
 335
 336         sdi->model = devname->str;
 337         sdi->version = version->str;
 338         g_string_free(devname, FALSE);
 339         g_string_free(version, FALSE);
 340
 341         return sdi;
 342 }
 343
 344 SR_PRIV int p_ols_set_samplerate(const struct sr_dev_inst *sdi,
 345                 const uint64_t samplerate)
 346 {
 347         struct dev_context *devc;
 348
 349         devc = sdi->priv;
 350         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 351                 return SR_ERR_SAMPLERATE;
 352
 353         if (samplerate > CLOCK_RATE) {
 354                 sr_info("Enabling demux mode.");
 355                 devc->flag_reg |= FLAG_DEMUX;
 356                 devc->flag_reg &= ~FLAG_FILTER;
 357                 devc->max_channels = NUM_CHANNELS / 2;
 358                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 359         } else {
 360                 sr_info("Disabling demux mode.");
 361                 devc->flag_reg &= ~FLAG_DEMUX;
 362                 devc->flag_reg |= FLAG_FILTER;
 363                 devc->max_channels = NUM_CHANNELS;
 364                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 365         }
 366
 367         /* Calculate actual samplerate used and complain if it is different
 368          * from the requested.
 369          */
 370         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 371         if (devc->flag_reg & FLAG_DEMUX)
 372                 devc->cur_samplerate *= 2;
 373         if (devc->cur_samplerate != samplerate)
 374                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 375                        PRIu64 ".", samplerate, devc->cur_samplerate);
 376
 377         return SR_OK;
 378 }
 379
 380 SR_PRIV int p_ols_receive_data(int fd, int revents, void *cb_data)
 381 {
 382         struct dev_context *devc;
 383         struct sr_dev_inst *sdi;
 384         struct sr_datafeed_packet packet;
 385         struct sr_datafeed_logic logic;
 386         uint32_t sample;
 387         int num_channels, offset, j;
 388         int bytes_read, index;
 389         unsigned int i;
 390         unsigned char byte;
 391
 392         (void)fd;
 393         (void)revents;
 394
 395         sdi = cb_data;
 396         devc = sdi->priv;
 397
 398         if (devc->num_transfers++ == 0) {
 399                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 400                 if (!devc->raw_sample_buf) {
 401                         sr_err("Sample buffer malloc failed.");
 402                         return FALSE;
 403                 }
 404                 /* fill with 1010... for debugging */
 405                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 406         }
 407
 408         if ((devc->num_samples < devc->limit_samples) && (devc->cnt_samples < devc->max_samples)) {
 409
 410                 num_channels = 0;
 411                 for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
 412                         if ((devc->flag_reg & i) == 0) {
 413                                 num_channels++;
 414                         }
 415                 }
 416
 417                 /* Get a block of data. */
 418                 bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
 419                 if (bytes_read < 0) {
 420                         sr_err("Failed to read FTDI data (%d): %s.",
 421                                bytes_read, ftdi_get_error_string(devc->ftdic));
 422                         sr_dev_acquisition_stop(sdi);
 423                         return FALSE;
 424                 }
 425                 if (bytes_read == 0) {
 426                         sr_spew("Received 0 bytes, nothing to do.");
 427                         return TRUE;
 428                 }
 429
 430                 sr_dbg("Received %d bytes", bytes_read);
 431
 432                 index = 0;
 433                 while (index < bytes_read) {
 434                         byte = devc->ftdi_buf[index++];
 435                         devc->cnt_bytes++;
 436
 437                         devc->sample[devc->num_bytes++] = byte;
 438                         sr_spew("Received byte 0x%.2x.", byte);
 439
 440                         if ((devc->flag_reg & FLAG_DEMUX) && (devc->flag_reg & FLAG_RLE)) {
 441                                 /* RLE in demux mode must be processed differently
 442                                 * since in this case the RLE encoder is operating on pairs of samples.
 443                                 */
 444                                 if (devc->num_bytes == num_channels * 2) {
 445                                         devc->cnt_samples += 2;
 446                                         devc->cnt_samples_rle += 2;
 447                                         /*
 448                                          * Got a sample pair. Convert from the OLS's little-endian
 449                                          * sample to the local format.
 450                                          */
 451                                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 452                                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 453                                         sr_spew("Received sample pair 0x%.*x.", devc->num_bytes * 2, sample);
 454
 455                                         /*
 456                                          * In RLE mode the high bit of the sample pair is the
 457                                          * "count" flag, meaning this sample pair is the number
 458                                          * of times the previous sample pair occurred.
 459                                          */
 460                                         if (devc->sample[devc->num_bytes - 1] & 0x80) {
 461                                                 /* Clear the high bit. */
 462                                                 sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 463                                                 devc->rle_count = sample;
 464                                                 devc->cnt_samples_rle += devc->rle_count * 2;
 465                                                 sr_dbg("RLE count: %u.", devc->rle_count * 2);
 466                                                 devc->num_bytes = 0;
 467                                                 continue;
 468                                         }
 469                                         devc->num_samples += (devc->rle_count + 1) * 2;
 470                                         if (devc->num_samples > devc->limit_samples) {
 471                                                 /* Save us from overrunning the buffer. */
 472                                                 devc->rle_count -= (devc->num_samples - devc->limit_samples) / 2;
 473                                                 devc->num_samples = devc->limit_samples;
 474                                                 index = bytes_read;
 475                                         }
 476
 477                                         /*
 478                                          * Some channel groups may have been turned
 479                                          * off, to speed up transfer between the
 480                                          * hardware and the PC. Expand that here before
 481                                          * submitting it over the session bus --
 482                                          * whatever is listening on the bus will be
 483                                          * expecting a full 32-bit sample, based on
 484                                          * the number of channels.
 485                                          */
 486                                         j = 0;
 487                                         /* expand first sample */
 488                                         memset(devc->tmp_sample, 0, 4);
 489                                         for (i = 0; i < 2; i++) {
 490                                                 if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 491                                                         /*
 492                                                          * This channel group was
 493                                                          * enabled, copy from received
 494                                                          * sample.
 495                                                          */
 496                                                         devc->tmp_sample[i] = devc->sample[j++];
 497                                                 }
 498                                         }
 499                                         /* Clear out the most significant bit of the sample */
 500                                         devc->tmp_sample[devc->num_bytes - 1] &= 0x7f;
 501                                         sr_spew("Expanded sample 1: 0x%.2x%.2x%.2x%.2x.",
 502                                                 devc->tmp_sample[3], devc->tmp_sample[2],
 503                                                 devc->tmp_sample[1], devc->tmp_sample[0]);
 504
 505                                         /* expand second sample */
 506                                         memset(devc->tmp_sample2, 0, 4);
 507                                         for (i = 0; i < 2; i++) {
 508                                                 if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 509                                                         /*
 510                                                          * This channel group was
 511                                                          * enabled, copy from received
 512                                                          * sample.
 513                                                          */
 514                                                         devc->tmp_sample2[i] = devc->sample[j++];
 515                                                 }
 516                                         }
 517                                         /* Clear out the most significant bit of the sample */
 518                                         devc->tmp_sample2[devc->num_bytes - 1] &= 0x7f;
 519                                         sr_spew("Expanded sample 2: 0x%.2x%.2x%.2x%.2x.",
 520                                                 devc->tmp_sample2[3], devc->tmp_sample2[2],
 521                                                 devc->tmp_sample2[1], devc->tmp_sample2[0]);
 522
 523                                         /*
 524                                          * OLS sends its sample buffer backwards.
 525                                          * store it in reverse order here, so we can dump
 526                                          * this on the session bus later.
 527                                          */
 528                                         offset = (devc->limit_samples - devc->num_samples) * 4;
 529                                         for (i = 0; i <= devc->rle_count; i++) {
 530                                                 memcpy(devc->raw_sample_buf + offset + (i * 8),
 531                                                                          devc->tmp_sample2, 4);
 532                                                 memcpy(devc->raw_sample_buf + offset + (4 + (i * 8)),
 533                                                                          devc->tmp_sample, 4);
 534                                         }
 535                                         memset(devc->sample, 0, 4);
 536                                         devc->num_bytes = 0;
 537                                         devc->rle_count = 0;
 538                                 }
 539                         }
 540                         else {
 541                                 if (devc->num_bytes == num_channels) {
 542                                         devc->cnt_samples++;
 543                                         devc->cnt_samples_rle++;
 544                                         /*
 545                                          * Got a full sample. Convert from the OLS's little-endian
 546                                          * sample to the local format.
 547                                          */
 548                                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 549                                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 550                                         sr_spew("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 551                                         if (devc->flag_reg & FLAG_RLE) {
 552                                                 /*
 553                                                  * In RLE mode the high bit of the sample is the
 554                                                  * "count" flag, meaning this sample is the number
 555                                                  * of times the previous sample occurred.
 556                                                  */
 557                                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 558                                                         /* Clear the high bit. */
 559                                                         sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 560                                                         devc->rle_count = sample;
 561                                                         devc->cnt_samples_rle += devc->rle_count;
 562                                                         sr_dbg("RLE count: %u.", devc->rle_count);
 563                                                         devc->num_bytes = 0;
 564                                                         continue;
 565                                                 }
 566                                         }
 567                                         devc->num_samples += devc->rle_count + 1;
 568                                         if (devc->num_samples > devc->limit_samples) {
 569                                                 /* Save us from overrunning the buffer. */
 570                                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 571                                                 devc->num_samples = devc->limit_samples;
 572                                                 index = bytes_read;
 573                                         }
 574
 575                                         if (num_channels < 4) {
 576                                                 /*
 577                                                  * Some channel groups may have been turned
 578                                                  * off, to speed up transfer between the
 579                                                  * hardware and the PC. Expand that here before
 580                                                  * submitting it over the session bus --
 581                                                  * whatever is listening on the bus will be
 582                                                  * expecting a full 32-bit sample, based on
 583                                                  * the number of channels.
 584                                                  */
 585                                                 j = 0;
 586                                                 memset(devc->tmp_sample, 0, 4);
 587                                                 for (i = 0; i < 4; i++) {
 588                                                         if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 589                                                                 /*
 590                                                                  * This channel group was
 591                                                                  * enabled, copy from received
 592                                                                  * sample.
 593                                                                  */
 594                                                                 devc->tmp_sample[i] = devc->sample[j++];
 595                                                         }
 596                                                 }
 597                                                 memcpy(devc->sample, devc->tmp_sample, 4);
 598                                                 sr_spew("Expanded sample: 0x%.8x.", sample);
 599                                         }
 600
 601                                         /*
 602                                          * Pipistrello OLS sends its sample buffer backwards.
 603                                          * store it in reverse order here, so we can dump
 604                                          * this on the session bus later.
 605                                          */
 606                                         offset = (devc->limit_samples - devc->num_samples) * 4;
 607                                         for (i = 0; i <= devc->rle_count; i++) {
 608                                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 609                                                                          devc->sample, 4);
 610                                         }
 611                                         memset(devc->sample, 0, 4);
 612                                         devc->num_bytes = 0;
 613                                         devc->rle_count = 0;
 614                                 }
 615                         }
 616                 }
 617                 return TRUE;
 618         } else {
 619                 do {
 620                         bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
 621                 } while (bytes_read > 0);
 622
 623                 /*
 624                  * We've acquired all the samples we asked for -- we're done.
 625                  * Send the (properly-ordered) buffer to the frontend.
 626                  */
 627                 sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
 628                                 devc->cnt_bytes, devc->cnt_samples,
 629                                 devc->cnt_samples_rle);
 630                 if (devc->trigger_at != -1) {
 631                         /*
 632                          * A trigger was set up, so we need to tell the frontend
 633                          * about it.
 634                          */
 635                         if (devc->trigger_at > 0) {
 636                                 /* There are pre-trigger samples, send those first. */
 637                                 packet.type = SR_DF_LOGIC;
 638                                 packet.payload = &logic;
 639                                 logic.length = devc->trigger_at * 4;
 640                                 logic.unitsize = 4;
 641                                 logic.data = devc->raw_sample_buf +
 642                                         (devc->limit_samples - devc->num_samples) * 4;
 643                                 sr_session_send(sdi, &packet);
 644                         }
 645
 646                         /* Send the trigger. */
 647                         packet.type = SR_DF_TRIGGER;
 648                         sr_session_send(sdi, &packet);
 649
 650                         /* Send post-trigger samples. */
 651                         packet.type = SR_DF_LOGIC;
 652                         packet.payload = &logic;
 653                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 654                         logic.unitsize = 4;
 655                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 656                                 (devc->limit_samples - devc->num_samples) * 4;
 657                         sr_session_send(sdi, &packet);
 658                 } else {
 659                         /* no trigger was used */
 660                         packet.type = SR_DF_LOGIC;
 661                         packet.payload = &logic;
 662                         logic.length = devc->num_samples * 4;
 663                         logic.unitsize = 4;
 664                         logic.data = devc->raw_sample_buf +
 665                                 (devc->limit_samples - devc->num_samples) * 4;
 666                         sr_session_send(sdi, &packet);
 667                 }
 668                 g_free(devc->raw_sample_buf);
 669
 670                 sr_dev_acquisition_stop(sdi);
 671         }
 672
 673         return TRUE;
 674 }