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 extern SR_PRIV struct sr_dev_driver p_ols_driver_info;
  24
  25 SR_PRIV int write_shortcommand(struct dev_context *devc, uint8_t command)
  26 {
  27         uint8_t buf[1];
  28         int bytes_written;
  29
  30         sr_dbg("Sending cmd 0x%.2x.", command);
  31         buf[0] = command;
  32         bytes_written = ftdi_write_data(devc->ftdic, buf, 1);
  33         if (bytes_written < 0) {
  34                 sr_err("Failed to write FTDI data (%d): %s.",
  35                        bytes_written, ftdi_get_error_string(devc->ftdic));
  36                 return SR_ERR;
  37         } else if (bytes_written != 1) {
  38                 sr_err("FTDI write error, only %d/%d bytes written: %s.",
  39                        bytes_written, 1, ftdi_get_error_string(devc->ftdic));
  40                 return SR_ERR;
  41         }
  42
  43         return SR_OK;
  44 }
  45
  46 SR_PRIV int write_longcommand(struct dev_context *devc, uint8_t command, uint8_t *data)
  47 {
  48         uint8_t buf[5];
  49         int bytes_written;
  50
  51         sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
  52                         data[0], data[1], data[2], data[3]);
  53         buf[0] = command;
  54         buf[1] = data[0];
  55         buf[2] = data[1];
  56         buf[3] = data[2];
  57         buf[4] = data[3];
  58         bytes_written = ftdi_write_data(devc->ftdic, buf, 5);
  59         if (bytes_written < 0) {
  60                 sr_err("Failed to write FTDI data (%d): %s.",
  61                        bytes_written, ftdi_get_error_string(devc->ftdic));
  62                 return SR_ERR;
  63         } else if (bytes_written != 5) {
  64                 sr_err("FTDI write error, only %d/%d bytes written: %s.",
  65                        bytes_written, 1, ftdi_get_error_string(devc->ftdic));
  66                 return SR_ERR;
  67         }
  68
  69         return SR_OK;
  70 }
  71
  72 SR_PRIV int p_ols_open(struct dev_context *devc)
  73 {
  74         int ret;
  75
  76         /* Note: Caller checks devc and devc->ftdic. */
  77
  78         /* Select interface B, otherwise communication will fail. */
  79         ret = ftdi_set_interface(devc->ftdic, INTERFACE_B);
  80         if (ret < 0) {
  81                 sr_err("Failed to set FTDI interface B (%d): %s", ret,
  82                        ftdi_get_error_string(devc->ftdic));
  83                 return SR_ERR;
  84         }
  85         sr_dbg("FTDI chip interface B set successfully.");
  86
  87         /* Check for the device and temporarily open it. */
  88         ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID, USB_DEVICE_ID,
  89                                  USB_IPRODUCT, NULL);
  90         if (ret < 0) {
  91                 /* Log errors, except for -3 ("device not found"). */
  92                 if (ret != -3)
  93                         sr_err("Failed to open device (%d): %s", ret,
  94                                ftdi_get_error_string(devc->ftdic));
  95                 return SR_ERR;
  96         }
  97         sr_dbg("FTDI device opened successfully.");
  98
  99         /* Purge RX/TX buffers in the FTDI chip. */
 100         if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
 101                 sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
 102                        ret, ftdi_get_error_string(devc->ftdic));
 103                 goto err_open_close_ftdic;
 104         }
 105         sr_dbg("FTDI chip buffers purged successfully.");
 106
 107         /* Reset the FTDI bitmode. */
 108         ret = ftdi_set_bitmode(devc->ftdic, 0xff, BITMODE_RESET);
 109         if (ret < 0) {
 110                 sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
 111                        ret, ftdi_get_error_string(devc->ftdic));
 112                 goto err_open_close_ftdic;
 113         }
 114         sr_dbg("FTDI chip bitmode reset successfully.");
 115
 116         /* Set the FTDI latency timer to 16. */
 117         ret = ftdi_set_latency_timer(devc->ftdic, 16);
 118         if (ret < 0) {
 119                 sr_err("Failed to set FTDI latency timer (%d): %s.",
 120                        ret, ftdi_get_error_string(devc->ftdic));
 121                 goto err_open_close_ftdic;
 122         }
 123         sr_dbg("FTDI chip latency timer set successfully.");
 124
 125         /* Set the FTDI read data chunk size to 64kB. */
 126         ret = ftdi_read_data_set_chunksize(devc->ftdic, 64 * 1024);
 127         if (ret < 0) {
 128                 sr_err("Failed to set FTDI read data chunk size (%d): %s.",
 129                        ret, ftdi_get_error_string(devc->ftdic));
 130                 goto err_open_close_ftdic;
 131         }
 132         sr_dbg("FTDI chip read data chunk size set successfully.");
 133
 134         return SR_OK;
 135
 136 err_open_close_ftdic:
 137         ftdi_usb_close(devc->ftdic);
 138         return SR_ERR;
 139 }
 140
 141 SR_PRIV int p_ols_close(struct dev_context *devc)
 142 {
 143         int ret;
 144
 145         /* Note: Caller checks devc and devc->ftdic. */
 146
 147         if ((ret = ftdi_usb_close(devc->ftdic)) < 0) {
 148                 sr_err("Failed to close FTDI device (%d): %s.",
 149                        ret, ftdi_get_error_string(devc->ftdic));
 150                 return SR_ERR;
 151         }
 152
 153         return SR_OK;
 154 }
 155
 156 /* Configures the channel mask based on which channels are enabled. */
 157 SR_PRIV void pols_channel_mask(const struct sr_dev_inst *sdi)
 158 {
 159         struct dev_context *devc;
 160         struct sr_channel *channel;
 161         const GSList *l;
 162
 163         devc = sdi->priv;
 164
 165         devc->channel_mask = 0;
 166         for (l = sdi->channels; l; l = l->next) {
 167                 channel = l->data;
 168                 if (channel->enabled)
 169                         devc->channel_mask |= 1 << channel->index;
 170         }
 171 }
 172
 173 SR_PRIV int pols_convert_trigger(const struct sr_dev_inst *sdi)
 174 {
 175         struct dev_context *devc;
 176         struct sr_trigger *trigger;
 177         struct sr_trigger_stage *stage;
 178         struct sr_trigger_match *match;
 179         const GSList *l, *m;
 180         int i;
 181
 182         devc = sdi->priv;
 183
 184         devc->num_stages = 0;
 185         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 186                 devc->trigger_mask[i] = 0;
 187                 devc->trigger_value[i] = 0;
 188                 devc->trigger_edge[i] = 0;
 189         }
 190
 191         if (!(trigger = sr_session_trigger_get(sdi->session)))
 192                 return SR_OK;
 193
 194         devc->num_stages = g_slist_length(trigger->stages);
 195         if (devc->num_stages > NUM_TRIGGER_STAGES) {
 196                 sr_err("This device only supports %d trigger stages.",
 197                                 NUM_TRIGGER_STAGES);
 198                 return SR_ERR;
 199         }
 200
 201         for (l = trigger->stages; l; l = l->next) {
 202                 stage = l->data;
 203                 for (m = stage->matches; m; m = m->next) {
 204                         match = m->data;
 205                         if (!match->channel->enabled)
 206                                 /* Ignore disabled channels with a trigger. */
 207                                 continue;
 208                         devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
 209                         if (match->match == SR_TRIGGER_ONE || match->match == SR_TRIGGER_RISING)
 210                                 devc->trigger_value[stage->stage] |= 1 << match->channel->index;
 211                         if (match->match == SR_TRIGGER_RISING || match->match == SR_TRIGGER_FALLING)
 212                                 devc->trigger_edge[stage->stage] |= 1 << match->channel->index;
 213                 }
 214         }
 215
 216         return SR_OK;
 217 }
 218
 219 SR_PRIV struct sr_dev_inst *p_ols_get_metadata(uint8_t *buf, int bytes_read, struct dev_context *devc)
 220 {
 221         struct sr_dev_inst *sdi;
 222         uint32_t tmp_int, ui;
 223         uint8_t key, type, token;
 224         GString *tmp_str, *devname, *version;
 225         guchar tmp_c;
 226         int index, i;
 227
 228         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 229         sdi->status = SR_ST_INACTIVE;
 230         sdi->driver = &p_ols_driver_info;
 231         sdi->priv = devc;
 232
 233         devname = g_string_new("");
 234         version = g_string_new("");
 235
 236         index = 0;
 237         while (index < bytes_read) {
 238                 key = buf[index++];
 239                 if (key == 0x00) {
 240                         sr_dbg("Got metadata key 0x00, metadata ends.");
 241                         break;
 242                 }
 243                 type = key >> 5;
 244                 token = key & 0x1f;
 245                 switch (type) {
 246                 case 0:
 247                         /* NULL-terminated string */
 248                         tmp_str = g_string_new("");
 249                         while ((index < bytes_read) && ((tmp_c = buf[index++]) != '\0'))
 250                                 g_string_append_c(tmp_str, tmp_c);
 251                         sr_dbg("Got metadata key 0x%.2x value '%s'.",
 252                                key, tmp_str->str);
 253                         switch (token) {
 254                         case 0x01:
 255                                 /* Device name */
 256                                 devname = g_string_append(devname, tmp_str->str);
 257                                 break;
 258                         case 0x02:
 259                                 /* FPGA firmware version */
 260                                 if (version->len)
 261                                         g_string_append(version, ", ");
 262                                 g_string_append(version, "FPGA version ");
 263                                 g_string_append(version, tmp_str->str);
 264                                 break;
 265                         case 0x03:
 266                                 /* Ancillary version */
 267                                 if (version->len)
 268                                         g_string_append(version, ", ");
 269                                 g_string_append(version, "Ancillary version ");
 270                                 g_string_append(version, tmp_str->str);
 271                                 break;
 272                         default:
 273                                 sr_info("Unknown token 0x%.2x: '%s'",
 274                                         token, tmp_str->str);
 275                                 break;
 276                         }
 277                         g_string_free(tmp_str, TRUE);
 278                         break;
 279                 case 1:
 280                         /* 32-bit unsigned integer */
 281                         tmp_int = 0;
 282                         for (i = 0; i < 4; i++) {
 283                                 tmp_int = (tmp_int << 8) | buf[index++];
 284                         }
 285                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 286                                key, tmp_int);
 287                         switch (token) {
 288                         case 0x00:
 289                                 /* Number of usable channels */
 290                                 for (ui = 0; ui < tmp_int; ui++)
 291                                         sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
 292                                                         p_ols_channel_names[ui]);
 293                                 break;
 294                         case 0x01:
 295                                 /* Amount of sample memory available (bytes) */
 296                                 devc->max_samplebytes = tmp_int;
 297                                 break;
 298                         case 0x02:
 299                                 /* Amount of dynamic memory available (bytes) */
 300                                 /* what is this for? */
 301                                 break;
 302                         case 0x03:
 303                                 /* Maximum sample rate (Hz) */
 304                                 devc->max_samplerate = tmp_int;
 305                                 break;
 306                         case 0x04:
 307                                 /* protocol version */
 308                                 devc->protocol_version = tmp_int;
 309                                 break;
 310                         default:
 311                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 312                                         token, tmp_int);
 313                                 break;
 314                         }
 315                         break;
 316                 case 2:
 317                         /* 8-bit unsigned integer */
 318                         tmp_c = buf[index++];
 319                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 320                                key, tmp_c);
 321                         switch (token) {
 322                         case 0x00:
 323                                 /* Number of usable channels */
 324                                 for (ui = 0; ui < tmp_c; ui++)
 325                                         sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
 326                                                         p_ols_channel_names[ui]);
 327                                 break;
 328                         case 0x01:
 329                                 /* protocol version */
 330                                 devc->protocol_version = tmp_c;
 331                                 break;
 332                         default:
 333                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 334                                         token, tmp_c);
 335                                 break;
 336                         }
 337                         break;
 338                 default:
 339                         /* unknown type */
 340                         break;
 341                 }
 342         }
 343
 344         sdi->model = devname->str;
 345         sdi->version = version->str;
 346         g_string_free(devname, FALSE);
 347         g_string_free(version, FALSE);
 348
 349         return sdi;
 350 }
 351
 352 SR_PRIV int p_ols_set_samplerate(const struct sr_dev_inst *sdi,
 353                 const uint64_t samplerate)
 354 {
 355         struct dev_context *devc;
 356
 357         devc = sdi->priv;
 358         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 359                 return SR_ERR_SAMPLERATE;
 360
 361         if (samplerate > CLOCK_RATE) {
 362                 sr_info("Enabling demux mode.");
 363                 devc->flag_reg |= FLAG_DEMUX;
 364                 devc->flag_reg &= ~FLAG_FILTER;
 365                 devc->max_channels = NUM_CHANNELS / 2;
 366                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 367         } else {
 368                 sr_info("Disabling demux mode.");
 369                 devc->flag_reg &= ~FLAG_DEMUX;
 370                 devc->flag_reg |= FLAG_FILTER;
 371                 devc->max_channels = NUM_CHANNELS;
 372                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 373         }
 374
 375         /* Calculate actual samplerate used and complain if it is different
 376          * from the requested.
 377          */
 378         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 379         if (devc->flag_reg & FLAG_DEMUX)
 380                 devc->cur_samplerate *= 2;
 381         if (devc->cur_samplerate != samplerate)
 382                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 383                        PRIu64 ".", samplerate, devc->cur_samplerate);
 384
 385         return SR_OK;
 386 }
 387
 388 SR_PRIV int p_ols_receive_data(int fd, int revents, void *cb_data)
 389 {
 390         struct dev_context *devc;
 391         struct sr_dev_inst *sdi;
 392         struct sr_datafeed_packet packet;
 393         struct sr_datafeed_logic logic;
 394         uint32_t sample;
 395         int num_channels, offset, j;
 396         int bytes_read, index;
 397         unsigned int i;
 398         unsigned char byte;
 399
 400         (void)fd;
 401         (void)revents;
 402
 403         sdi = cb_data;
 404         devc = sdi->priv;
 405
 406         if (devc->num_transfers++ == 0) {
 407                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 408                 if (!devc->raw_sample_buf) {
 409                         sr_err("Sample buffer malloc failed.");
 410                         return FALSE;
 411                 }
 412                 /* fill with 1010... for debugging */
 413                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 414         }
 415
 416         if ((devc->num_samples < devc->limit_samples) && (devc->cnt_samples < devc->max_samples)) {
 417
 418                 num_channels = 0;
 419                 for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
 420                         if ((devc->flag_reg & i) == 0) {
 421                                 num_channels++;
 422                         }
 423                 }
 424
 425                 /* Get a block of data. */
 426                 bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
 427                 if (bytes_read < 0) {
 428                         sr_err("Failed to read FTDI data (%d): %s.",
 429                                bytes_read, ftdi_get_error_string(devc->ftdic));
 430                         sdi->driver->dev_acquisition_stop(sdi, sdi);
 431                         return FALSE;
 432                 }
 433                 if (bytes_read == 0) {
 434                         sr_spew("Received 0 bytes, nothing to do.");
 435                         return TRUE;
 436                 }
 437
 438                 sr_dbg("Received %d bytes", bytes_read);
 439
 440                 index = 0;
 441                 while (index < bytes_read) {
 442                         byte = devc->ftdi_buf[index++];
 443                         devc->cnt_bytes++;
 444
 445                         devc->sample[devc->num_bytes++] = byte;
 446                         sr_spew("Received byte 0x%.2x.", byte);
 447
 448                         if ((devc->flag_reg & FLAG_DEMUX) && (devc->flag_reg & FLAG_RLE)) {
 449                                 /* RLE in demux mode must be processed differently
 450                                 * since in this case the RLE encoder is operating on pairs of samples.
 451                                 */
 452                                 if (devc->num_bytes == num_channels * 2) {
 453                                         devc->cnt_samples += 2;
 454                                         devc->cnt_samples_rle += 2;
 455                                         /*
 456                                          * Got a sample pair. Convert from the OLS's little-endian
 457                                          * sample to the local format.
 458                                          */
 459                                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 460                                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 461                                         sr_spew("Received sample pair 0x%.*x.", devc->num_bytes * 2, sample);
 462
 463                                         /*
 464                                          * In RLE mode the high bit of the sample pair is the
 465                                          * "count" flag, meaning this sample pair is the number
 466                                          * of times the previous sample pair occurred.
 467                                          */
 468                                         if (devc->sample[devc->num_bytes - 1] & 0x80) {
 469                                                 /* Clear the high bit. */
 470                                                 sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 471                                                 devc->rle_count = sample;
 472                                                 devc->cnt_samples_rle += devc->rle_count * 2;
 473                                                 sr_dbg("RLE count: %u.", devc->rle_count * 2);
 474                                                 devc->num_bytes = 0;
 475                                                 continue;
 476                                         }
 477                                         devc->num_samples += (devc->rle_count + 1) * 2;
 478                                         if (devc->num_samples > devc->limit_samples) {
 479                                                 /* Save us from overrunning the buffer. */
 480                                                 devc->rle_count -= (devc->num_samples - devc->limit_samples) / 2;
 481                                                 devc->num_samples = devc->limit_samples;
 482                                                 index = bytes_read;
 483                                         }
 484
 485                                         /*
 486                                          * Some channel groups may have been turned
 487                                          * off, to speed up transfer between the
 488                                          * hardware and the PC. Expand that here before
 489                                          * submitting it over the session bus --
 490                                          * whatever is listening on the bus will be
 491                                          * expecting a full 32-bit sample, based on
 492                                          * the number of channels.
 493                                          */
 494                                         j = 0;
 495                                         /* expand first sample */
 496                                         memset(devc->tmp_sample, 0, 4);
 497                                         for (i = 0; i < 2; i++) {
 498                                                 if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 499                                                         /*
 500                                                          * This channel group was
 501                                                          * enabled, copy from received
 502                                                          * sample.
 503                                                          */
 504                                                         devc->tmp_sample[i] = devc->sample[j++];
 505                                                 }
 506                                         }
 507                                         /* Clear out the most significant bit of the sample */
 508                                         devc->tmp_sample[devc->num_bytes - 1] &= 0x7f;
 509                                         sr_spew("Expanded sample 1: 0x%.2x%.2x%.2x%.2x.",
 510                                                 devc->tmp_sample[3], devc->tmp_sample[2],
 511                                                 devc->tmp_sample[1], devc->tmp_sample[0]);
 512
 513                                         /* expand second sample */
 514                                         memset(devc->tmp_sample2, 0, 4);
 515                                         for (i = 0; i < 2; i++) {
 516                                                 if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 517                                                         /*
 518                                                          * This channel group was
 519                                                          * enabled, copy from received
 520                                                          * sample.
 521                                                          */
 522                                                         devc->tmp_sample2[i] = devc->sample[j++];
 523                                                 }
 524                                         }
 525                                         /* Clear out the most significant bit of the sample */
 526                                         devc->tmp_sample2[devc->num_bytes - 1] &= 0x7f;
 527                                         sr_spew("Expanded sample 2: 0x%.2x%.2x%.2x%.2x.",
 528                                                 devc->tmp_sample2[3], devc->tmp_sample2[2],
 529                                                 devc->tmp_sample2[1], devc->tmp_sample2[0]);
 530
 531                                         /*
 532                                          * OLS sends its sample buffer backwards.
 533                                          * store it in reverse order here, so we can dump
 534                                          * this on the session bus later.
 535                                          */
 536                                         offset = (devc->limit_samples - devc->num_samples) * 4;
 537                                         for (i = 0; i <= devc->rle_count; i++) {
 538                                                 memcpy(devc->raw_sample_buf + offset + (i * 8),
 539                                                                          devc->tmp_sample2, 4);
 540                                                 memcpy(devc->raw_sample_buf + offset + (4 + (i * 8)),
 541                                                                          devc->tmp_sample, 4);
 542                                         }
 543                                         memset(devc->sample, 0, 4);
 544                                         devc->num_bytes = 0;
 545                                         devc->rle_count = 0;
 546                                 }
 547                         }
 548                         else {
 549                                 if (devc->num_bytes == num_channels) {
 550                                         devc->cnt_samples++;
 551                                         devc->cnt_samples_rle++;
 552                                         /*
 553                                          * Got a full sample. Convert from the OLS's little-endian
 554                                          * sample to the local format.
 555                                          */
 556                                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 557                                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 558                                         sr_spew("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 559                                         if (devc->flag_reg & FLAG_RLE) {
 560                                                 /*
 561                                                  * In RLE mode the high bit of the sample is the
 562                                                  * "count" flag, meaning this sample is the number
 563                                                  * of times the previous sample occurred.
 564                                                  */
 565                                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 566                                                         /* Clear the high bit. */
 567                                                         sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 568                                                         devc->rle_count = sample;
 569                                                         devc->cnt_samples_rle += devc->rle_count;
 570                                                         sr_dbg("RLE count: %u.", devc->rle_count);
 571                                                         devc->num_bytes = 0;
 572                                                         continue;
 573                                                 }
 574                                         }
 575                                         devc->num_samples += devc->rle_count + 1;
 576                                         if (devc->num_samples > devc->limit_samples) {
 577                                                 /* Save us from overrunning the buffer. */
 578                                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 579                                                 devc->num_samples = devc->limit_samples;
 580                                                 index = bytes_read;
 581                                         }
 582
 583                                         if (num_channels < 4) {
 584                                                 /*
 585                                                  * Some channel groups may have been turned
 586                                                  * off, to speed up transfer between the
 587                                                  * hardware and the PC. Expand that here before
 588                                                  * submitting it over the session bus --
 589                                                  * whatever is listening on the bus will be
 590                                                  * expecting a full 32-bit sample, based on
 591                                                  * the number of channels.
 592                                                  */
 593                                                 j = 0;
 594                                                 memset(devc->tmp_sample, 0, 4);
 595                                                 for (i = 0; i < 4; i++) {
 596                                                         if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 597                                                                 /*
 598                                                                  * This channel group was
 599                                                                  * enabled, copy from received
 600                                                                  * sample.
 601                                                                  */
 602                                                                 devc->tmp_sample[i] = devc->sample[j++];
 603                                                         }
 604                                                 }
 605                                                 memcpy(devc->sample, devc->tmp_sample, 4);
 606                                                 sr_spew("Expanded sample: 0x%.8x.", sample);
 607                                         }
 608
 609                                         /*
 610                                          * Pipistrello OLS sends its sample buffer backwards.
 611                                          * store it in reverse order here, so we can dump
 612                                          * this on the session bus later.
 613                                          */
 614                                         offset = (devc->limit_samples - devc->num_samples) * 4;
 615                                         for (i = 0; i <= devc->rle_count; i++) {
 616                                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 617                                                                          devc->sample, 4);
 618                                         }
 619                                         memset(devc->sample, 0, 4);
 620                                         devc->num_bytes = 0;
 621                                         devc->rle_count = 0;
 622                                 }
 623                         }
 624                 }
 625                 return TRUE;
 626         } else {
 627                 do {
 628                         bytes_read = ftdi_read_data(devc->ftdic, devc->ftdi_buf, FTDI_BUF_SIZE);
 629                 } while (bytes_read > 0);
 630
 631                 /*
 632                  * We've acquired all the samples we asked for -- we're done.
 633                  * Send the (properly-ordered) buffer to the frontend.
 634                  */
 635                 sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
 636                                 devc->cnt_bytes, devc->cnt_samples,
 637                                 devc->cnt_samples_rle);
 638                 if (devc->trigger_at != -1) {
 639                         /*
 640                          * A trigger was set up, so we need to tell the frontend
 641                          * about it.
 642                          */
 643                         if (devc->trigger_at > 0) {
 644                                 /* There are pre-trigger samples, send those first. */
 645                                 packet.type = SR_DF_LOGIC;
 646                                 packet.payload = &logic;
 647                                 logic.length = devc->trigger_at * 4;
 648                                 logic.unitsize = 4;
 649                                 logic.data = devc->raw_sample_buf +
 650                                         (devc->limit_samples - devc->num_samples) * 4;
 651                                 sr_session_send(cb_data, &packet);
 652                         }
 653
 654                         /* Send the trigger. */
 655                         packet.type = SR_DF_TRIGGER;
 656                         sr_session_send(cb_data, &packet);
 657
 658                         /* Send post-trigger samples. */
 659                         packet.type = SR_DF_LOGIC;
 660                         packet.payload = &logic;
 661                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 662                         logic.unitsize = 4;
 663                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 664                                 (devc->limit_samples - devc->num_samples) * 4;
 665                         sr_session_send(cb_data, &packet);
 666                 } else {
 667                         /* no trigger was used */
 668                         packet.type = SR_DF_LOGIC;
 669                         packet.payload = &logic;
 670                         logic.length = devc->num_samples * 4;
 671                         logic.unitsize = 4;
 672                         logic.data = devc->raw_sample_buf +
 673                                 (devc->limit_samples - devc->num_samples) * 4;
 674                         sr_session_send(cb_data, &packet);
 675                 }
 676                 g_free(devc->raw_sample_buf);
 677
 678                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 679         }
 680
 681         return TRUE;
 682 }