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 "protocol.h"
  21
  22 extern SR_PRIV struct sr_dev_driver p_ols_driver_info;
  23
  24 SR_PRIV int write_shortcommand(struct dev_context *devc, uint8_t command)
  25 {
  26         uint8_t buf[1];
  27         int bytes_written;
  28
  29         sr_dbg("Sending cmd 0x%.2x.", command);
  30         buf[0] = command;
  31         bytes_written = ftdi_write_data(devc->ftdic, buf, 1);
  32         if (bytes_written < 0) {
  33                 sr_err("Failed to write FTDI data (%d): %s.",
  34                        bytes_written, ftdi_get_error_string(devc->ftdic));
  35                 return SR_ERR;
  36         } else if (bytes_written != 1) {
  37                 sr_err("FTDI write error, only %d/%d bytes written: %s.",
  38                        bytes_written, 1, ftdi_get_error_string(devc->ftdic));
  39                 return SR_ERR;
  40         }
  41
  42         return SR_OK;
  43 }
  44
  45 SR_PRIV int write_longcommand(struct dev_context *devc, uint8_t command, uint8_t *data)
  46 {
  47         uint8_t buf[5];
  48         int bytes_written;
  49
  50         sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
  51                         data[0], data[1], data[2], data[3]);
  52         buf[0] = command;
  53         buf[1] = data[0];
  54         buf[2] = data[1];
  55         buf[3] = data[2];
  56         buf[4] = data[3];
  57         bytes_written = ftdi_write_data(devc->ftdic, buf, 5);
  58         if (bytes_written < 0) {
  59                 sr_err("Failed to write FTDI data (%d): %s.",
  60                        bytes_written, ftdi_get_error_string(devc->ftdic));
  61                 return SR_ERR;
  62         } else if (bytes_written != 5) {
  63                 sr_err("FTDI write error, only %d/%d bytes written: %s.",
  64                        bytes_written, 1, ftdi_get_error_string(devc->ftdic));
  65                 return SR_ERR;
  66         }
  67
  68         return SR_OK;
  69 }
  70
  71 SR_PRIV int p_ols_open(struct dev_context *devc)
  72 {
  73         int ret;
  74
  75         /* Note: Caller checks devc and devc->ftdic. */
  76
  77         /* Select interface B, otherwise communication will fail. */
  78         ret = ftdi_set_interface(devc->ftdic, INTERFACE_B);
  79         if (ret < 0) {
  80                 sr_err("Failed to set FTDI interface B (%d): %s", ret,
  81                        ftdi_get_error_string(devc->ftdic));
  82                 return SR_ERR;
  83         }
  84         sr_dbg("FTDI chip interface B set successfully.");
  85
  86         /* Check for the device and temporarily open it. */
  87         ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID, USB_DEVICE_ID,
  88                                  USB_IPRODUCT, NULL);
  89         if (ret < 0) {
  90                 /* Log errors, except for -3 ("device not found"). */
  91                 if (ret != -3)
  92                         sr_err("Failed to open device (%d): %s", ret,
  93                                ftdi_get_error_string(devc->ftdic));
  94                 return SR_ERR;
  95         }
  96         sr_dbg("FTDI device opened successfully.");
  97
  98         /* Purge RX/TX buffers in the FTDI chip. */
  99         if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
 100                 sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
 101                        ret, ftdi_get_error_string(devc->ftdic));
 102                 goto err_open_close_ftdic;
 103         }
 104         sr_dbg("FTDI chip buffers purged successfully.");
 105
 106         /* Reset the FTDI bitmode. */
 107         ret = ftdi_set_bitmode(devc->ftdic, 0xff, BITMODE_RESET);
 108         if (ret < 0) {
 109                 sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
 110                        ret, ftdi_get_error_string(devc->ftdic));
 111                 goto err_open_close_ftdic;
 112         }
 113         sr_dbg("FTDI chip bitmode reset successfully.");
 114
 115         /* Set the FTDI latency timer to 16. */
 116         ret = ftdi_set_latency_timer(devc->ftdic, 16);
 117         if (ret < 0) {
 118                 sr_err("Failed to set FTDI latency timer (%d): %s.",
 119                        ret, ftdi_get_error_string(devc->ftdic));
 120                 goto err_open_close_ftdic;
 121         }
 122         sr_dbg("FTDI chip latency timer set successfully.");
 123
 124         /* Set the FTDI read data chunk size to 64kB. */
 125         ret = ftdi_read_data_set_chunksize(devc->ftdic, 64 * 1024);
 126         if (ret < 0) {
 127                 sr_err("Failed to set FTDI read data chunk size (%d): %s.",
 128                        ret, ftdi_get_error_string(devc->ftdic));
 129                 goto err_open_close_ftdic;
 130         }
 131         sr_dbg("FTDI chip read data chunk size set successfully.");
 132
 133         return SR_OK;
 134
 135 err_open_close_ftdic:
 136         ftdi_usb_close(devc->ftdic);
 137         return SR_ERR;
 138 }
 139
 140 SR_PRIV int p_ols_close(struct dev_context *devc)
 141 {
 142         int ret;
 143
 144         /* Note: Caller checks devc and devc->ftdic. */
 145
 146         if ((ret = ftdi_usb_close(devc->ftdic)) < 0) {
 147                 sr_err("Failed to close FTDI device (%d): %s.",
 148                        ret, ftdi_get_error_string(devc->ftdic));
 149                 return SR_ERR;
 150         }
 151
 152         return SR_OK;
 153 }
 154
 155 /* Configures the channel mask based on which channels are enabled. */
 156 SR_PRIV void pols_channel_mask(const struct sr_dev_inst *sdi)
 157 {
 158         struct dev_context *devc;
 159         struct sr_channel *channel;
 160         const GSList *l;
 161
 162         devc = sdi->priv;
 163
 164         devc->channel_mask = 0;
 165         for (l = sdi->channels; l; l = l->next) {
 166                 channel = l->data;
 167                 if (channel->enabled)
 168                         devc->channel_mask |= 1 << channel->index;
 169         }
 170 }
 171
 172 SR_PRIV int pols_convert_trigger(const struct sr_dev_inst *sdi)
 173 {
 174         struct dev_context *devc;
 175         struct sr_trigger *trigger;
 176         struct sr_trigger_stage *stage;
 177         struct sr_trigger_match *match;
 178         const GSList *l, *m;
 179         int i;
 180
 181         devc = sdi->priv;
 182
 183         devc->num_stages = 0;
 184         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 185                 devc->trigger_mask[i] = 0;
 186                 devc->trigger_value[i] = 0;
 187                 devc->trigger_edge[i] = 0;
 188         }
 189
 190         if (!(trigger = sr_session_trigger_get(sdi->session)))
 191                 return SR_OK;
 192
 193         devc->num_stages = g_slist_length(trigger->stages);
 194         if (devc->num_stages > NUM_TRIGGER_STAGES) {
 195                 sr_err("This device only supports %d trigger stages.",
 196                                 NUM_TRIGGER_STAGES);
 197                 return SR_ERR;
 198         }
 199
 200         for (l = trigger->stages; l; l = l->next) {
 201                 stage = l->data;
 202                 for (m = stage->matches; m; m = m->next) {
 203                         match = m->data;
 204                         if (!match->channel->enabled)
 205                                 /* Ignore disabled channels with a trigger. */
 206                                 continue;
 207                         devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
 208                         if (match->match == SR_TRIGGER_ONE || match->match == SR_TRIGGER_RISING)
 209                                 devc->trigger_value[stage->stage] |= 1 << match->channel->index;
 210                         if (match->match == SR_TRIGGER_RISING || match->match == SR_TRIGGER_FALLING)
 211                                 devc->trigger_edge[stage->stage] |= 1 << match->channel->index;
 212                 }
 213         }
 214
 215         return SR_OK;
 216 }
 217
 218 SR_PRIV struct sr_dev_inst *p_ols_get_metadata(uint8_t *buf, int bytes_read, struct dev_context *devc)
 219 {
 220         struct sr_dev_inst *sdi;
 221         uint32_t tmp_int, ui;
 222         uint8_t key, type, token;
 223         GString *tmp_str, *devname, *version;
 224         guchar tmp_c;
 225         int index, i;
 226
 227         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 228         sdi->status = SR_ST_INACTIVE;
 229         sdi->driver = &p_ols_driver_info;
 230         sdi->priv = devc;
 231
 232         devname = g_string_new("");
 233         version = g_string_new("");
 234
 235         index = 0;
 236         while (index < bytes_read) {
 237                 key = buf[index++];
 238                 if (key == 0x00) {
 239                         sr_dbg("Got metadata key 0x00, metadata ends.");
 240                         break;
 241                 }
 242                 type = key >> 5;
 243                 token = key & 0x1f;
 244                 switch (type) {
 245                 case 0:
 246                         /* NULL-terminated string */
 247                         tmp_str = g_string_new("");
 248                         while ((index < bytes_read) && ((tmp_c = buf[index++]) != '\0'))
 249                                 g_string_append_c(tmp_str, tmp_c);
 250                         sr_dbg("Got metadata key 0x%.2x value '%s'.",
 251                                key, tmp_str->str);
 252                         switch (token) {
 253                         case 0x01:
 254                                 /* Device name */
 255                                 devname = g_string_append(devname, tmp_str->str);
 256                                 break;
 257                         case 0x02:
 258                                 /* FPGA firmware version */
 259                                 if (version->len)
 260                                         g_string_append(version, ", ");
 261                                 g_string_append(version, "FPGA version ");
 262                                 g_string_append(version, tmp_str->str);
 263                                 break;
 264                         case 0x03:
 265                                 /* Ancillary version */
 266                                 if (version->len)
 267                                         g_string_append(version, ", ");
 268                                 g_string_append(version, "Ancillary version ");
 269                                 g_string_append(version, tmp_str->str);
 270                                 break;
 271                         default:
 272                                 sr_info("Unknown token 0x%.2x: '%s'",
 273                                         token, tmp_str->str);
 274                                 break;
 275                         }
 276                         g_string_free(tmp_str, TRUE);
 277                         break;
 278                 case 1:
 279                         /* 32-bit unsigned integer */
 280                         tmp_int = 0;
 281                         for (i = 0; i < 4; i++) {
 282                                 tmp_int = (tmp_int << 8) | buf[index++];
 283                         }
 284                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 285                                key, tmp_int);
 286                         switch (token) {
 287                         case 0x00:
 288                                 /* Number of usable channels */
 289                                 for (ui = 0; ui < tmp_int; ui++)
 290                                         sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
 291                                                         p_ols_channel_names[ui]);
 292                                 break;
 293                         case 0x01:
 294                                 /* Amount of sample memory available (bytes) */
 295                                 devc->max_samplebytes = tmp_int;
 296                                 break;
 297                         case 0x02:
 298                                 /* Amount of dynamic memory available (bytes) */
 299                                 /* what is this for? */
 300                                 break;
 301                         case 0x03:
 302                                 /* Maximum sample rate (Hz) */
 303                                 devc->max_samplerate = tmp_int;
 304                                 break;
 305                         case 0x04:
 306                                 /* protocol version */
 307                                 devc->protocol_version = tmp_int;
 308                                 break;
 309                         default:
 310                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 311                                         token, tmp_int);
 312                                 break;
 313                         }
 314                         break;
 315                 case 2:
 316                         /* 8-bit unsigned integer */
 317                         tmp_c = buf[index++];
 318                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 319                                key, tmp_c);
 320                         switch (token) {
 321                         case 0x00:
 322                                 /* Number of usable channels */
 323                                 for (ui = 0; ui < tmp_c; ui++)
 324                                         sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
 325                                                         p_ols_channel_names[ui]);
 326                                 break;
 327                         case 0x01:
 328                                 /* protocol version */
 329                                 devc->protocol_version = tmp_c;
 330                                 break;
 331                         default:
 332                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 333                                         token, tmp_c);
 334                                 break;
 335                         }
 336                         break;
 337                 default:
 338                         /* unknown type */
 339                         break;
 340                 }
 341         }
 342
 343         sdi->model = devname->str;
 344         sdi->version = version->str;
 345         g_string_free(devname, FALSE);
 346         g_string_free(version, FALSE);
 347
 348         return sdi;
 349 }
 350
 351 SR_PRIV int p_ols_set_samplerate(const struct sr_dev_inst *sdi,
 352                 const uint64_t samplerate)
 353 {
 354         struct dev_context *devc;
 355
 356         devc = sdi->priv;
 357         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 358                 return SR_ERR_SAMPLERATE;
 359
 360         if (samplerate > CLOCK_RATE) {
 361                 sr_info("Enabling demux mode.");
 362                 devc->flag_reg |= FLAG_DEMUX;
 363                 devc->flag_reg &= ~FLAG_FILTER;
 364                 devc->max_channels = NUM_CHANNELS / 2;
 365                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 366         } else {
 367                 sr_info("Disabling demux mode.");
 368                 devc->flag_reg &= ~FLAG_DEMUX;
 369                 devc->flag_reg |= FLAG_FILTER;
 370                 devc->max_channels = NUM_CHANNELS;
 371                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 372         }
 373
 374         /* Calculate actual samplerate used and complain if it is different
 375          * from the requested.
 376          */
 377         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 378         if (devc->flag_reg & FLAG_DEMUX)
 379                 devc->cur_samplerate *= 2;
 380         if (devc->cur_samplerate != samplerate)
 381                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 382                        PRIu64 ".", samplerate, devc->cur_samplerate);
 383
 384         return SR_OK;
 385 }
 386
 387 SR_PRIV int p_ols_receive_data(int fd, int revents, void *cb_data)
 388 {
 389         struct dev_context *devc;
 390         struct sr_dev_inst *sdi;
 391         struct sr_datafeed_packet packet;
 392         struct sr_datafeed_logic logic;
 393         uint32_t sample;
 394         int num_channels, offset, j;
 395         int bytes_read, index;
 396         unsigned int i;
 397         unsigned char byte;
 398
 399         (void)fd;
 400         (void)revents;
 401
 402         sdi = cb_data;
 403         devc = sdi->priv;
 404
 405         if (devc->num_transfers++ == 0) {
 406                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 407                 if (!devc->raw_sample_buf) {
 408                         sr_err("Sample buffer malloc failed.");
 409                         return FALSE;
 410                 }
 411                 /* fill with 1010... for debugging */
 412                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 413         }
 414
 415         if ((devc->num_samples < devc->limit_samples) && (devc->cnt_samples < devc->max_samples)) {
 416
 417                 num_channels = 0;
 418                 for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
 419                         if ((devc->flag_reg & i) == 0) {
 420                                 num_channels++;
 421                         }
 422                 }
 423
 424                 /* Get a block of data. */
 425                 bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
 426                 if (bytes_read < 0) {
 427                         sr_err("Failed to read FTDI data (%d): %s.",
 428                                bytes_read, ftdi_get_error_string(devc->ftdic));
 429                         sdi->driver->dev_acquisition_stop(sdi, sdi);
 430                         return FALSE;
 431                 }
 432                 if (bytes_read == 0) {
 433                         sr_spew("Received 0 bytes, nothing to do.");
 434                         return TRUE;
 435                 }
 436
 437                 sr_dbg("Received %d bytes", bytes_read);
 438
 439                 index = 0;
 440                 while (index < bytes_read) {
 441                         byte = devc->ftdi_buf[index++];
 442                         devc->cnt_bytes++;
 443
 444                         devc->sample[devc->num_bytes++] = byte;
 445                         sr_spew("Received byte 0x%.2x.", byte);
 446
 447                         if ((devc->flag_reg & FLAG_DEMUX) && (devc->flag_reg & FLAG_RLE)) {
 448                                 /* RLE in demux mode must be processed differently
 449                                 * since in this case the RLE encoder is operating on pairs of samples.
 450                                 */
 451                                 if (devc->num_bytes == num_channels * 2) {
 452                                         devc->cnt_samples += 2;
 453                                         devc->cnt_samples_rle += 2;
 454                                         /*
 455                                          * Got a sample pair. Convert from the OLS's little-endian
 456                                          * sample to the local format.
 457                                          */
 458                                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 459                                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 460                                         sr_spew("Received sample pair 0x%.*x.", devc->num_bytes * 2, sample);
 461
 462                                         /*
 463                                          * In RLE mode the high bit of the sample pair is the
 464                                          * "count" flag, meaning this sample pair is the number
 465                                          * of times the previous sample pair occurred.
 466                                          */
 467                                         if (devc->sample[devc->num_bytes - 1] & 0x80) {
 468                                                 /* Clear the high bit. */
 469                                                 sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 470                                                 devc->rle_count = sample;
 471                                                 devc->cnt_samples_rle += devc->rle_count * 2;
 472                                                 sr_dbg("RLE count: %u.", devc->rle_count * 2);
 473                                                 devc->num_bytes = 0;
 474                                                 continue;
 475                                         }
 476                                         devc->num_samples += (devc->rle_count + 1) * 2;
 477                                         if (devc->num_samples > devc->limit_samples) {
 478                                                 /* Save us from overrunning the buffer. */
 479                                                 devc->rle_count -= (devc->num_samples - devc->limit_samples) / 2;
 480                                                 devc->num_samples = devc->limit_samples;
 481                                                 index = bytes_read;
 482                                         }
 483
 484                                         /*
 485                                          * Some channel groups may have been turned
 486                                          * off, to speed up transfer between the
 487                                          * hardware and the PC. Expand that here before
 488                                          * submitting it over the session bus --
 489                                          * whatever is listening on the bus will be
 490                                          * expecting a full 32-bit sample, based on
 491                                          * the number of channels.
 492                                          */
 493                                         j = 0;
 494                                         /* expand first sample */
 495                                         memset(devc->tmp_sample, 0, 4);
 496                                         for (i = 0; i < 2; i++) {
 497                                                 if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 498                                                         /*
 499                                                          * This channel group was
 500                                                          * enabled, copy from received
 501                                                          * sample.
 502                                                          */
 503                                                         devc->tmp_sample[i] = devc->sample[j++];
 504                                                 }
 505                                         }
 506                                         /* Clear out the most significant bit of the sample */
 507                                         devc->tmp_sample[devc->num_bytes - 1] &= 0x7f;
 508                                         sr_spew("Expanded sample 1: 0x%.8x.", devc->tmp_sample);
 509
 510                                         /* expand second sample */
 511                                         memset(devc->tmp_sample2, 0, 4);
 512                                         for (i = 0; i < 2; i++) {
 513                                                 if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 514                                                         /*
 515                                                          * This channel group was
 516                                                          * enabled, copy from received
 517                                                          * sample.
 518                                                          */
 519                                                         devc->tmp_sample2[i] = devc->sample[j++];
 520                                                 }
 521                                         }
 522                                         /* Clear out the most significant bit of the sample */
 523                                         devc->tmp_sample2[devc->num_bytes - 1] &= 0x7f;
 524                                         sr_spew("Expanded sample 2: 0x%.8x.", devc->tmp_sample2);
 525
 526                                         /*
 527                                          * OLS sends its sample buffer backwards.
 528                                          * store it in reverse order here, so we can dump
 529                                          * this on the session bus later.
 530                                          */
 531                                         offset = (devc->limit_samples - devc->num_samples) * 4;
 532                                         for (i = 0; i <= devc->rle_count; i++) {
 533                                                 memcpy(devc->raw_sample_buf + offset + (i * 8),
 534                                                                          devc->tmp_sample2, 4);
 535                                                 memcpy(devc->raw_sample_buf + offset + (4 + (i * 8)),
 536                                                                          devc->tmp_sample, 4);
 537                                         }
 538                                         memset(devc->sample, 0, 4);
 539                                         devc->num_bytes = 0;
 540                                         devc->rle_count = 0;
 541                                 }
 542                         }
 543                         else {
 544                                 if (devc->num_bytes == num_channels) {
 545                                         devc->cnt_samples++;
 546                                         devc->cnt_samples_rle++;
 547                                         /*
 548                                          * Got a full sample. Convert from the OLS's little-endian
 549                                          * sample to the local format.
 550                                          */
 551                                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 552                                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 553                                         sr_spew("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 554                                         if (devc->flag_reg & FLAG_RLE) {
 555                                                 /*
 556                                                  * In RLE mode the high bit of the sample is the
 557                                                  * "count" flag, meaning this sample is the number
 558                                                  * of times the previous sample occurred.
 559                                                  */
 560                                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 561                                                         /* Clear the high bit. */
 562                                                         sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 563                                                         devc->rle_count = sample;
 564                                                         devc->cnt_samples_rle += devc->rle_count;
 565                                                         sr_dbg("RLE count: %u.", devc->rle_count);
 566                                                         devc->num_bytes = 0;
 567                                                         continue;
 568                                                 }
 569                                         }
 570                                         devc->num_samples += devc->rle_count + 1;
 571                                         if (devc->num_samples > devc->limit_samples) {
 572                                                 /* Save us from overrunning the buffer. */
 573                                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 574                                                 devc->num_samples = devc->limit_samples;
 575                                                 index = bytes_read;
 576                                         }
 577
 578                                         if (num_channels < 4) {
 579                                                 /*
 580                                                  * Some channel groups may have been turned
 581                                                  * off, to speed up transfer between the
 582                                                  * hardware and the PC. Expand that here before
 583                                                  * submitting it over the session bus --
 584                                                  * whatever is listening on the bus will be
 585                                                  * expecting a full 32-bit sample, based on
 586                                                  * the number of channels.
 587                                                  */
 588                                                 j = 0;
 589                                                 memset(devc->tmp_sample, 0, 4);
 590                                                 for (i = 0; i < 4; i++) {
 591                                                         if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 592                                                                 /*
 593                                                                  * This channel group was
 594                                                                  * enabled, copy from received
 595                                                                  * sample.
 596                                                                  */
 597                                                                 devc->tmp_sample[i] = devc->sample[j++];
 598                                                         }
 599                                                 }
 600                                                 memcpy(devc->sample, devc->tmp_sample, 4);
 601                                                 sr_spew("Expanded sample: 0x%.8x.", sample);
 602                                         }
 603
 604                                         /*
 605                                          * Pipistrello OLS sends its sample buffer backwards.
 606                                          * store it in reverse order here, so we can dump
 607                                          * this on the session bus later.
 608                                          */
 609                                         offset = (devc->limit_samples - devc->num_samples) * 4;
 610                                         for (i = 0; i <= devc->rle_count; i++) {
 611                                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 612                                                                          devc->sample, 4);
 613                                         }
 614                                         memset(devc->sample, 0, 4);
 615                                         devc->num_bytes = 0;
 616                                         devc->rle_count = 0;
 617                                 }
 618                         }
 619                 }
 620                 return TRUE;
 621         } else {
 622                 do bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
 623                 while (bytes_read > 0);
 624
 625                 /*
 626                  * We've acquired all the samples we asked for -- we're done.
 627                  * Send the (properly-ordered) buffer to the frontend.
 628                  */
 629                 sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
 630                                 devc->cnt_bytes, devc->cnt_samples,
 631                                 devc->cnt_samples_rle);
 632                 if (devc->trigger_at != -1) {
 633                         /*
 634                          * A trigger was set up, so we need to tell the frontend
 635                          * about it.
 636                          */
 637                         if (devc->trigger_at > 0) {
 638                                 /* There are pre-trigger samples, send those first. */
 639                                 packet.type = SR_DF_LOGIC;
 640                                 packet.payload = &logic;
 641                                 logic.length = devc->trigger_at * 4;
 642                                 logic.unitsize = 4;
 643                                 logic.data = devc->raw_sample_buf +
 644                                         (devc->limit_samples - devc->num_samples) * 4;
 645                                 sr_session_send(cb_data, &packet);
 646                         }
 647
 648                         /* Send the trigger. */
 649                         packet.type = SR_DF_TRIGGER;
 650                         sr_session_send(cb_data, &packet);
 651
 652                         /* Send post-trigger samples. */
 653                         packet.type = SR_DF_LOGIC;
 654                         packet.payload = &logic;
 655                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 656                         logic.unitsize = 4;
 657                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 658                                 (devc->limit_samples - devc->num_samples) * 4;
 659                         sr_session_send(cb_data, &packet);
 660                 } else {
 661                         /* no trigger was used */
 662                         packet.type = SR_DF_LOGIC;
 663                         packet.payload = &logic;
 664                         logic.length = devc->num_samples * 4;
 665                         logic.unitsize = 4;
 666                         logic.data = devc->raw_sample_buf +
 667                                 (devc->limit_samples - devc->num_samples) * 4;
 668                         sr_session_send(cb_data, &packet);
 669                 }
 670                 g_free(devc->raw_sample_buf);
 671
 672                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 673         }
 674
 675         return TRUE;
 676 }