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