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