src/hardware/openbench-logic-sniffer/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
  24 struct ols_basic_trigger_desc {
  25         uint32_t trigger_mask[NUM_BASIC_TRIGGER_STAGES];
  26         uint32_t trigger_value[NUM_BASIC_TRIGGER_STAGES];
  27         int num_stages;
  28 };
  29
  30 SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
  31                 uint8_t command)
  32 {
  33         char buf[1];
  34
  35         sr_dbg("Sending cmd 0x%.2x.", command);
  36         buf[0] = command;
  37         if (serial_write_blocking(serial, buf, 1, serial_timeout(serial, 1)) != 1)
  38                 return SR_ERR;
  39
  40         if (serial_drain(serial) != SR_OK)
  41                 return SR_ERR;
  42
  43         return SR_OK;
  44 }
  45
  46 SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
  47                 uint8_t command, uint8_t *data)
  48 {
  49         char buf[5];
  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         if (serial_write_blocking(serial, buf, 5, serial_timeout(serial, 1)) != 5)
  59                 return SR_ERR;
  60
  61         if (serial_drain(serial) != SR_OK)
  62                 return SR_ERR;
  63
  64         return SR_OK;
  65 }
  66
  67 SR_PRIV int ols_send_reset(struct sr_serial_dev_inst *serial)
  68 {
  69         unsigned int i;
  70
  71         for (i = 0; i < 5; i++) {
  72                 if (send_shortcommand(serial, CMD_RESET) != SR_OK)
  73                         return SR_ERR;
  74         }
  75
  76         return SR_OK;
  77 }
  78
  79 /* Configures the channel mask based on which channels are enabled. */
  80 SR_PRIV uint32_t ols_channel_mask(const struct sr_dev_inst *sdi)
  81 {
  82         uint32_t channel_mask = 0;
  83         for (const GSList *l = sdi->channels; l; l = l->next) {
  84                 struct sr_channel *channel = l->data;
  85                 if (channel->enabled)
  86                         channel_mask |= 1 << channel->index;
  87         }
  88
  89         return channel_mask;
  90 }
  91
  92 static int convert_trigger(const struct sr_dev_inst *sdi, struct ols_basic_trigger_desc *ols_trigger)
  93 {
  94         struct sr_trigger *trigger;
  95         struct sr_trigger_stage *stage;
  96         struct sr_trigger_match *match;
  97         const GSList *l, *m;
  98         int i;
  99
 100         ols_trigger->num_stages = 0;
 101         for (i = 0; i < NUM_BASIC_TRIGGER_STAGES; i++) {
 102                 ols_trigger->trigger_mask[i] = 0;
 103                 ols_trigger->trigger_value[i] = 0;
 104         }
 105
 106         if (!(trigger = sr_session_trigger_get(sdi->session)))
 107                 return SR_OK;
 108
 109         ols_trigger->num_stages = g_slist_length(trigger->stages);
 110         if (ols_trigger->num_stages > NUM_BASIC_TRIGGER_STAGES) {
 111                 sr_err("This device only supports %d trigger stages.",
 112                                 NUM_BASIC_TRIGGER_STAGES);
 113                 return SR_ERR;
 114         }
 115
 116         for (l = trigger->stages; l; l = l->next) {
 117                 stage = l->data;
 118                 for (m = stage->matches; m; m = m->next) {
 119                         match = m->data;
 120                         if (!match->channel->enabled)
 121                                 /* Ignore disabled channels with a trigger. */
 122                                 continue;
 123                         ols_trigger->trigger_mask[stage->stage] |= 1 << match->channel->index;
 124                         if (match->match == SR_TRIGGER_ONE)
 125                                 ols_trigger->trigger_value[stage->stage] |= 1 << match->channel->index;
 126                 }
 127         }
 128
 129         return SR_OK;
 130 }
 131
 132 SR_PRIV struct dev_context *ols_dev_new(void)
 133 {
 134         struct dev_context *devc;
 135
 136         devc = g_malloc0(sizeof(struct dev_context));
 137         devc->trigger_at_smpl = OLS_NO_TRIGGER;
 138
 139         return devc;
 140 }
 141
 142 static void ols_channel_new(struct sr_dev_inst *sdi, int num_chan)
 143 {
 144         struct dev_context *devc = sdi->priv;
 145         int i;
 146
 147         for (i = 0; i < num_chan; i++)
 148                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 149                                 ols_channel_names[i]);
 150
 151         devc->max_channels = num_chan;
 152 }
 153
 154 static void ols_metadata_quirks(struct sr_dev_inst *sdi)
 155 {
 156         struct dev_context *devc;
 157         gboolean is_shrimp;
 158
 159         if (!sdi)
 160                 return;
 161         devc = sdi->priv;
 162         if (!devc)
 163                 return;
 164
 165         is_shrimp = sdi->model && strcmp(sdi->model, "Shrimp1.0") == 0;
 166         if (is_shrimp) {
 167                 if (!devc->max_channels)
 168                         ols_channel_new(sdi, 4);
 169                 if (!devc->max_samples)
 170                         devc->max_samples = 256 * 1024;
 171                 if (!devc->max_samplerate)
 172                         devc->max_samplerate = SR_MHZ(20);
 173         }
 174
 175         if (sdi->version && strstr(sdi->version, "FPGA version 3.07"))
 176                 devc->device_flags |= DEVICE_FLAG_IS_DEMON_CORE;
 177 }
 178
 179 SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
 180 {
 181         struct sr_dev_inst *sdi;
 182         struct dev_context *devc;
 183         uint32_t tmp_int;
 184         uint8_t key, type;
 185         int delay_ms;
 186         GString *tmp_str, *devname, *version;
 187         guchar tmp_c;
 188
 189         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 190         sdi->status = SR_ST_INACTIVE;
 191         devc = ols_dev_new();
 192         sdi->priv = devc;
 193
 194         devname = g_string_new("");
 195         version = g_string_new("");
 196
 197         key = 0xff;
 198         while (key) {
 199                 delay_ms = serial_timeout(serial, 1);
 200                 if (serial_read_blocking(serial, &key, 1, delay_ms) != 1)
 201                         break;
 202                 if (key == METADATA_TOKEN_END) {
 203                         sr_dbg("Got metadata key 0x00, metadata ends.");
 204                         break;
 205                 }
 206                 type = key >> 5;
 207                 switch (type) {
 208                 case 0:
 209                         /* NULL-terminated string */
 210                         tmp_str = g_string_new("");
 211                         delay_ms = serial_timeout(serial, 1);
 212                         while (serial_read_blocking(serial, &tmp_c, 1, delay_ms) == 1 && tmp_c != '\0')
 213                                 g_string_append_c(tmp_str, tmp_c);
 214                         sr_dbg("Got metadata token 0x%.2x value '%s'.", key, tmp_str->str);
 215                         switch (key) {
 216                         case METADATA_TOKEN_DEVICE_NAME:
 217                                 /* Device name */
 218                                 devname = g_string_append(devname, tmp_str->str);
 219                                 break;
 220                         case METADATA_TOKEN_FPGA_VERSION:
 221                                 /* FPGA firmware version */
 222                                 if (version->len)
 223                                         g_string_append(version, ", ");
 224                                 g_string_append(version, "FPGA version ");
 225                                 g_string_append(version, tmp_str->str);
 226                                 break;
 227                         case METADATA_TOKEN_ANCILLARY_VERSION:
 228                                 /* Ancillary version */
 229                                 if (version->len)
 230                                         g_string_append(version, ", ");
 231                                 g_string_append(version, "Ancillary version ");
 232                                 g_string_append(version, tmp_str->str);
 233                                 break;
 234                         default:
 235                                 sr_info("ols: unknown token 0x%.2x: '%s'", key, tmp_str->str);
 236                                 break;
 237                         }
 238                         g_string_free(tmp_str, TRUE);
 239                         break;
 240                 case 1:
 241                         /* 32-bit unsigned integer */
 242                         delay_ms = serial_timeout(serial, 4);
 243                         if (serial_read_blocking(serial, &tmp_int, 4, delay_ms) != 4)
 244                                 break;
 245                         tmp_int = RB32(&tmp_int);
 246                         sr_dbg("Got metadata token 0x%.2x value 0x%.8x.", key, tmp_int);
 247                         switch (key) {
 248                         case METADATA_TOKEN_NUM_PROBES_LONG:
 249                                 /* Number of usable channels */
 250                                 ols_channel_new(sdi, tmp_int);
 251                                 break;
 252                         case METADATA_TOKEN_SAMPLE_MEMORY_BYTES:
 253                                 /* Amount of sample memory available (bytes) */
 254                                 devc->max_samples = tmp_int;
 255                                 break;
 256                         case METADATA_TOKEN_DYNAMIC_MEMORY_BYTES:
 257                                 /* Amount of dynamic memory available (bytes) */
 258                                 /* what is this for? */
 259                                 break;
 260                         case METADATA_TOKEN_MAX_SAMPLE_RATE_HZ:
 261                                 /* Maximum sample rate (Hz) */
 262                                 devc->max_samplerate = tmp_int;
 263                                 break;
 264                         case METADATA_TOKEN_PROTOCOL_VERSION_LONG:
 265                                 /* protocol version */
 266                                 devc->protocol_version = tmp_int;
 267                                 break;
 268                         default:
 269                                 sr_info("Unknown token 0x%.2x: 0x%.8x.", key, tmp_int);
 270                                 break;
 271                         }
 272                         break;
 273                 case 2:
 274                         /* 8-bit unsigned integer */
 275                         delay_ms = serial_timeout(serial, 1);
 276                         if (serial_read_blocking(serial, &tmp_c, 1, delay_ms) != 1)
 277                                 break;
 278                         sr_dbg("Got metadata token 0x%.2x value 0x%.2x.", key, tmp_c);
 279                         switch (key) {
 280                         case METADATA_TOKEN_NUM_PROBES_SHORT:
 281                                 /* Number of usable channels */
 282                                 ols_channel_new(sdi, tmp_c);
 283                                 break;
 284                         case METADATA_TOKEN_PROTOCOL_VERSION_SHORT:
 285                                 /* protocol version */
 286                                 devc->protocol_version = tmp_c;
 287                                 break;
 288                         default:
 289                                 sr_info("Unknown token 0x%.2x: 0x%.2x.", key, tmp_c);
 290                                 break;
 291                         }
 292                         break;
 293                 default:
 294                         /* unknown type */
 295                         break;
 296                 }
 297         }
 298
 299         sdi->model = devname->str;
 300         sdi->version = version->str;
 301         g_string_free(devname, FALSE);
 302         g_string_free(version, FALSE);
 303
 304         /* Optionally amend received metadata, model specific quirks. */
 305         ols_metadata_quirks(sdi);
 306
 307         return sdi;
 308 }
 309
 310 SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
 311                 const uint64_t samplerate)
 312 {
 313         struct dev_context *devc;
 314
 315         devc = sdi->priv;
 316         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 317                 return SR_ERR_SAMPLERATE;
 318
 319         if (samplerate > CLOCK_RATE) {
 320                 sr_info("Enabling demux mode.");
 321                 devc->capture_flags |= CAPTURE_FLAG_DEMUX;
 322                 devc->capture_flags &= ~CAPTURE_FLAG_NOISE_FILTER;
 323                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 324         } else {
 325                 sr_info("Disabling demux mode.");
 326                 devc->capture_flags &= ~CAPTURE_FLAG_DEMUX;
 327                 devc->capture_flags |= CAPTURE_FLAG_NOISE_FILTER;
 328                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 329         }
 330
 331         /* Calculate actual samplerate used and complain if it is different
 332          * from the requested.
 333          */
 334         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 335         if (devc->capture_flags & CAPTURE_FLAG_DEMUX)
 336                 devc->cur_samplerate *= 2;
 337         if (devc->cur_samplerate != samplerate)
 338                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 339                        PRIu64 ".", samplerate, devc->cur_samplerate);
 340
 341         return SR_OK;
 342 }
 343
 344 SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
 345 {
 346         struct sr_serial_dev_inst *serial;
 347
 348         serial = sdi->conn;
 349         ols_send_reset(serial);
 350
 351         serial_source_remove(sdi->session, serial);
 352
 353         std_session_send_df_end(sdi);
 354 }
 355
 356 SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
 357 {
 358         struct dev_context *devc;
 359         struct sr_dev_inst *sdi;
 360         struct sr_serial_dev_inst *serial;
 361         struct sr_datafeed_packet packet;
 362         struct sr_datafeed_logic logic;
 363         uint32_t sample;
 364         int num_changroups, offset, j;
 365         unsigned int i;
 366         unsigned char byte;
 367
 368         (void)fd;
 369
 370         sdi = cb_data;
 371         serial = sdi->conn;
 372         devc = sdi->priv;
 373
 374         if (devc->num_transfers == 0 && revents == 0) {
 375                 /* Ignore timeouts as long as we haven't received anything */
 376                 return TRUE;
 377         }
 378
 379         if (devc->num_transfers++ == 0) {
 380                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 381                 if (!devc->raw_sample_buf) {
 382                         sr_err("Sample buffer malloc failed.");
 383                         return FALSE;
 384                 }
 385                 /* fill with 1010... for debugging */
 386                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 387         }
 388
 389         num_changroups = 0;
 390         for (i = 0x20; i > 0x02; i >>= 1) {
 391                 if ((devc->capture_flags & i) == 0) {
 392                         num_changroups++;
 393                 }
 394         }
 395
 396         if (revents == G_IO_IN && devc->num_samples < devc->limit_samples) {
 397                 if (serial_read_nonblocking(serial, &byte, 1) != 1)
 398                         return FALSE;
 399                 devc->cnt_bytes++;
 400
 401                 /* Ignore it if we've read enough. */
 402                 if (devc->num_samples >= devc->limit_samples)
 403                         return TRUE;
 404
 405                 devc->sample[devc->num_bytes++] = byte;
 406                 sr_spew("Received byte 0x%.2x.", byte);
 407                 if (devc->num_bytes == num_changroups) {
 408                         devc->cnt_samples++;
 409                         devc->cnt_samples_rle++;
 410                         /*
 411                          * Got a full sample. Convert from the OLS's little-endian
 412                          * sample to the local format.
 413                          */
 414                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 415                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 416                         sr_dbg("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 417                         if (devc->capture_flags & CAPTURE_FLAG_RLE) {
 418                                 /*
 419                                  * In RLE mode the high bit of the sample is the
 420                                  * "count" flag, meaning this sample is the number
 421                                  * of times the previous sample occurred.
 422                                  */
 423                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 424                                         /* Clear the high bit. */
 425                                         sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 426                                         devc->rle_count = sample;
 427                                         devc->cnt_samples_rle += devc->rle_count;
 428                                         sr_dbg("RLE count: %u.", devc->rle_count);
 429                                         devc->num_bytes = 0;
 430                                         return TRUE;
 431                                 }
 432                         }
 433                         devc->num_samples += devc->rle_count + 1;
 434                         if (devc->num_samples > devc->limit_samples) {
 435                                 /* Save us from overrunning the buffer. */
 436                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 437                                 devc->num_samples = devc->limit_samples;
 438                         }
 439
 440                         if (num_changroups < 4) {
 441                                 /*
 442                                  * Some channel groups may have been turned
 443                                  * off, to speed up transfer between the
 444                                  * hardware and the PC. Expand that here before
 445                                  * submitting it over the session bus --
 446                                  * whatever is listening on the bus will be
 447                                  * expecting a full 32-bit sample, based on
 448                                  * the number of channels.
 449                                  */
 450                                 j = 0;
 451                                 memset(devc->tmp_sample, 0, 4);
 452                                 for (i = 0; i < 4; i++) {
 453                                         if (((devc->capture_flags >> 2) & (1 << i)) == 0) {
 454                                                 /*
 455                                                  * This channel group was
 456                                                  * enabled, copy from received
 457                                                  * sample.
 458                                                  */
 459                                                 devc->tmp_sample[i] = devc->sample[j++];
 460                                         } else if (devc->capture_flags & CAPTURE_FLAG_DEMUX && (i > 2)) {
 461                                                 /* group 2 & 3 get added to 0 & 1 */
 462                                                 devc->tmp_sample[i - 2] = devc->sample[j++];
 463                                         }
 464                                 }
 465                                 memcpy(devc->sample, devc->tmp_sample, 4);
 466                                 sr_spew("Expanded sample: 0x%.2hhx%.2hhx%.2hhx%.2hhx ",
 467                                         devc->sample[3], devc->sample[2], devc->sample[1], devc->sample[0]);
 468                         }
 469
 470                         /*
 471                          * the OLS sends its sample buffer backwards.
 472                          * store it in reverse order here, so we can dump
 473                          * this on the session bus later.
 474                          */
 475                         offset = (devc->limit_samples - devc->num_samples) * 4;
 476                         for (i = 0; i <= devc->rle_count; i++) {
 477                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 478                                        devc->sample, 4);
 479                         }
 480                         memset(devc->sample, 0, 4);
 481                         devc->num_bytes = 0;
 482                         devc->rle_count = 0;
 483                 }
 484         } else {
 485                 /*
 486                  * This is the main loop telling us a timeout was reached, or
 487                  * we've acquired all the samples we asked for -- we're done.
 488                  * Send the (properly-ordered) buffer to the frontend.
 489                  */
 490                 sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
 491                                 devc->cnt_bytes, devc->cnt_samples,
 492                                 devc->cnt_samples_rle);
 493                 if (devc->trigger_at_smpl != OLS_NO_TRIGGER) {
 494                         /*
 495                          * A trigger was set up, so we need to tell the frontend
 496                          * about it.
 497                          */
 498                         if (devc->trigger_at_smpl > 0) {
 499                                 /* There are pre-trigger samples, send those first. */
 500                                 packet.type = SR_DF_LOGIC;
 501                                 packet.payload = &logic;
 502                                 logic.length = devc->trigger_at_smpl * 4;
 503                                 logic.unitsize = 4;
 504                                 logic.data = devc->raw_sample_buf +
 505                                         (devc->limit_samples - devc->num_samples) * 4;
 506                                 sr_session_send(sdi, &packet);
 507                         }
 508
 509                         /* Send the trigger. */
 510                         std_session_send_df_trigger(sdi);
 511                 }
 512
 513                 /* Send post-trigger / all captured samples. */
 514                 int num_pre_trigger_samples = devc->trigger_at_smpl == OLS_NO_TRIGGER
 515                         ? 0 : devc->trigger_at_smpl;
 516                 packet.type = SR_DF_LOGIC;
 517                 packet.payload = &logic;
 518                 logic.length = (devc->num_samples - num_pre_trigger_samples) * 4;
 519                 logic.unitsize = 4;
 520                 logic.data = devc->raw_sample_buf + (num_pre_trigger_samples +
 521                         devc->limit_samples - devc->num_samples) * 4;
 522                 sr_session_send(sdi, &packet);
 523
 524                 g_free(devc->raw_sample_buf);
 525
 526                 serial_flush(serial);
 527                 abort_acquisition(sdi);
 528         }
 529
 530         return TRUE;
 531 }
 532
 533 static int ols_set_basic_trigger_stage(const struct ols_basic_trigger_desc *trigger_desc, struct sr_serial_dev_inst *serial, int stage)
 534 {
 535         uint8_t cmd, arg[4];
 536
 537         cmd = CMD_SET_BASIC_TRIGGER_MASK0 + stage * 4;
 538         arg[0] = trigger_desc->trigger_mask[stage] & 0xff;
 539         arg[1] = (trigger_desc->trigger_mask[stage] >> 8) & 0xff;
 540         arg[2] = (trigger_desc->trigger_mask[stage] >> 16) & 0xff;
 541         arg[3] = (trigger_desc->trigger_mask[stage] >> 24) & 0xff;
 542         if (send_longcommand(serial, cmd, arg) != SR_OK)
 543                 return SR_ERR;
 544
 545         cmd = CMD_SET_BASIC_TRIGGER_VALUE0 + stage * 4;
 546         arg[0] = trigger_desc->trigger_value[stage] & 0xff;
 547         arg[1] = (trigger_desc->trigger_value[stage] >> 8) & 0xff;
 548         arg[2] = (trigger_desc->trigger_value[stage] >> 16) & 0xff;
 549         arg[3] = (trigger_desc->trigger_value[stage] >> 24) & 0xff;
 550         if (send_longcommand(serial, cmd, arg) != SR_OK)
 551                 return SR_ERR;
 552
 553         cmd = CMD_SET_BASIC_TRIGGER_CONFIG0 + stage * 4;
 554         arg[0] = arg[1] = arg[3] = 0x00;
 555         arg[2] = stage;
 556         if (stage == trigger_desc->num_stages)
 557                 /* Last stage, fire when this one matches. */
 558                 arg[3] |= TRIGGER_START;
 559         if (send_longcommand(serial, cmd, arg) != SR_OK)
 560                 return SR_ERR;
 561
 562         return SR_OK;
 563 }
 564
 565 SR_PRIV int ols_prepare_acquisition(const struct sr_dev_inst *sdi) {
 566         int ret;
 567         uint8_t arg[4];
 568
 569         struct dev_context *devc = sdi->priv;
 570         struct sr_serial_dev_inst *serial = sdi->conn;
 571
 572         int num_changroups = 0;
 573         uint8_t changroup_mask = 0;
 574         uint32_t channel_mask = ols_channel_mask(sdi);
 575         for (unsigned int i = 0; i < 4; i++) {
 576                 if (channel_mask & (0xff << (i * 8))) {
 577                         changroup_mask |= (1 << i);
 578                         num_changroups++;
 579                 }
 580         }
 581
 582         /*
 583          * Limit readcount to prevent reading past the end of the hardware
 584          * buffer. Rather read too many samples than too few.
 585          */
 586         uint32_t samplecount = MIN(devc->max_samples / num_changroups, devc->limit_samples);
 587         uint32_t readcount = (samplecount + 3) / 4;
 588         uint32_t delaycount;
 589
 590         /* Basic triggers. */
 591         struct ols_basic_trigger_desc basic_trigger_desc;
 592         if (convert_trigger(sdi, &basic_trigger_desc) != SR_OK) {
 593                 sr_err("Failed to configure channels.");
 594                 return SR_ERR;
 595         }
 596         if (basic_trigger_desc.num_stages > 0) {
 597                 /*
 598                  * According to http://mygizmos.org/ols/Logic-Sniffer-FPGA-Spec.pdf
 599                  * reset command must be send prior each arm command
 600                  */
 601                 sr_dbg("Send reset command before trigger configure");
 602                 if (ols_send_reset(serial) != SR_OK)
 603                         return SR_ERR;
 604
 605                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
 606                 devc->trigger_at_smpl = (readcount - delaycount) * 4 - basic_trigger_desc.num_stages;
 607                 for (int i = 0; i <= basic_trigger_desc.num_stages; i++) {
 608                         sr_dbg("Setting OLS stage %d trigger.", i);
 609                         if ((ret = ols_set_basic_trigger_stage(&basic_trigger_desc, serial, i)) != SR_OK)
 610                                 return ret;
 611                 }
 612         } else {
 613                 /* No triggers configured, force trigger on first stage. */
 614                 sr_dbg("Forcing trigger at stage 0.");
 615                 if ((ret = ols_set_basic_trigger_stage(&basic_trigger_desc, serial, 0)) != SR_OK)
 616                         return ret;
 617                 delaycount = readcount;
 618         }
 619
 620         /* Samplerate. */
 621         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
 622                         devc->cur_samplerate, devc->cur_samplerate_divider);
 623         arg[0] = devc->cur_samplerate_divider & 0xff;
 624         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
 625         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
 626         arg[3] = 0x00;
 627         if (send_longcommand(serial, CMD_SET_DIVIDER, arg) != SR_OK)
 628                 return SR_ERR;
 629
 630         /* Send sample limit and pre/post-trigger capture ratio. */
 631         sr_dbg("Setting sample limit %d, trigger point at %d",
 632                         (readcount - 1) * 4, (delaycount - 1) * 4);
 633
 634         if (devc->max_samples > 256 * 1024) {
 635                 arg[0] = ((readcount - 1) & 0xff);
 636                 arg[1] = ((readcount - 1) & 0xff00) >> 8;
 637                 arg[2] = ((readcount - 1) & 0xff0000) >> 16;
 638                 arg[3] = ((readcount - 1) & 0xff000000) >> 24;
 639                 if (send_longcommand(serial, CMD_CAPTURE_READCOUNT, arg) != SR_OK)
 640                         return SR_ERR;
 641                 arg[0] = ((delaycount - 1) & 0xff);
 642                 arg[1] = ((delaycount - 1) & 0xff00) >> 8;
 643                 arg[2] = ((delaycount - 1) & 0xff0000) >> 16;
 644                 arg[3] = ((delaycount - 1) & 0xff000000) >> 24;
 645                 if (send_longcommand(serial, CMD_CAPTURE_DELAYCOUNT, arg) != SR_OK)
 646                         return SR_ERR;
 647         } else {
 648                 arg[0] = ((readcount - 1) & 0xff);
 649                 arg[1] = ((readcount - 1) & 0xff00) >> 8;
 650                 arg[2] = ((delaycount - 1) & 0xff);
 651                 arg[3] = ((delaycount - 1) & 0xff00) >> 8;
 652                 if (send_longcommand(serial, CMD_CAPTURE_SIZE, arg) != SR_OK)
 653                         return SR_ERR;
 654         }
 655
 656         /* Flag register. */
 657         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s, %s clock%s",
 658                         devc->capture_flags & CAPTURE_FLAG_INTERNAL_TEST_MODE ? "on": "off",
 659                         devc->capture_flags & CAPTURE_FLAG_EXTERNAL_TEST_MODE ? "on": "off",
 660                         devc->capture_flags & CAPTURE_FLAG_RLE ? "on" : "off",
 661                         devc->capture_flags & CAPTURE_FLAG_NOISE_FILTER ? "on": "off",
 662                         devc->capture_flags & CAPTURE_FLAG_DEMUX ? "on" : "off",
 663                         devc->capture_flags & CAPTURE_FLAG_CLOCK_EXTERNAL ? "external" : "internal",
 664                         devc->capture_flags & CAPTURE_FLAG_CLOCK_EXTERNAL ? (devc->capture_flags & CAPTURE_FLAG_INVERT_EXT_CLOCK
 665                                 ? " on falling edge" : "on rising edge") : "");
 666
 667         /*
 668          * Enable/disable OLS channel groups in the flag register according
 669          * to the channel mask. 1 means "disable channel".
 670          */
 671         devc->capture_flags &= ~0x3c;
 672         devc->capture_flags |= ~(changroup_mask << 2) & 0x3c;
 673
 674         /* RLE mode is always zero, for now. */
 675
 676         arg[0] = devc->capture_flags & 0xff;
 677         arg[1] = devc->capture_flags >> 8;
 678         arg[2] = arg[3] = 0x00;
 679         if (send_longcommand(serial, CMD_SET_FLAGS, arg) != SR_OK)
 680                 return SR_ERR;
 681
 682         return SR_OK;
 683 }