src/hardware/pipistrello-ols/api.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 static const uint32_t drvopts[] = {
  24         SR_CONF_LOGIC_ANALYZER,
  25 };
  26
  27 static const uint32_t devopts[] = {
  28         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  29         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  30         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  31         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  32         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  33         SR_CONF_EXTERNAL_CLOCK | SR_CONF_GET | SR_CONF_SET,
  34         SR_CONF_SWAP | SR_CONF_SET,
  35         SR_CONF_RLE | SR_CONF_GET | SR_CONF_SET,
  36 };
  37
  38 static const int32_t trigger_matches[] = {
  39         SR_TRIGGER_ZERO,
  40         SR_TRIGGER_ONE,
  41         SR_TRIGGER_RISING,
  42         SR_TRIGGER_FALLING,
  43 };
  44
  45 #define STR_PATTERN_NONE     "None"
  46 #define STR_PATTERN_EXTERNAL "External"
  47 #define STR_PATTERN_INTERNAL "Internal"
  48
  49 /* Supported methods of test pattern outputs */
  50 enum {
  51         /**
  52          * Capture pins 31:16 (unbuffered wing) output a test pattern
  53          * that can captured on pins 0:15.
  54          */
  55         PATTERN_EXTERNAL,
  56
  57         /** Route test pattern internally to capture buffer. */
  58         PATTERN_INTERNAL,
  59 };
  60
  61 static const char *patterns[] = {
  62         STR_PATTERN_NONE,
  63         STR_PATTERN_EXTERNAL,
  64         STR_PATTERN_INTERNAL,
  65 };
  66
  67 /* Channels are numbered 0-31 (on the PCB silkscreen). */
  68 SR_PRIV const char *p_ols_channel_names[] = {
  69         "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
  70         "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23",
  71         "24", "25", "26", "27", "28", "29", "30", "31",
  72 };
  73
  74 /* Default supported samplerates, can be overridden by device metadata. */
  75 static const uint64_t samplerates[] = {
  76         SR_HZ(10),
  77         SR_MHZ(200),
  78         SR_HZ(1),
  79 };
  80
  81 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  82 {
  83         struct sr_dev_inst *sdi;
  84         struct dev_context *devc;
  85         GSList *devices;
  86         int ret, i;
  87         char buf[70];
  88         int bytes_read;
  89
  90         (void)options;
  91
  92         devices = NULL;
  93
  94         devc = g_malloc0(sizeof(struct dev_context));
  95
  96         devc->max_samplebytes = devc->max_samplerate = devc->protocol_version = 0;
  97
  98         devc->limit_samples = devc->capture_ratio = 0;
  99         devc->trigger_at = -1;
 100         devc->channel_mask = 0xffffffff;
 101         devc->flag_reg = 0;
 102
 103         devc->ftdi_buf = g_malloc0(FTDI_BUF_SIZE);
 104
 105         if (!(devc->ftdic = ftdi_new())) {
 106                 sr_err("Failed to initialize libftdi.");
 107                 goto err_free_ftdi_buf;;
 108         }
 109
 110         if (p_ols_open(devc) != SR_OK)
 111                 goto err_free_ftdic;
 112
 113         /* The discovery procedure is like this: first send the Reset
 114          * command (0x00) 5 times, since the device could be anywhere
 115          * in a 5-byte command. Then send the ID command (0x02).
 116          * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
 117          * have a match.
 118          */
 119
 120         ret = SR_OK;
 121         for (i = 0; i < 5; i++) {
 122                 if ((ret = write_shortcommand(devc, CMD_RESET)) != SR_OK) {
 123                         break;
 124                 }
 125         }
 126         if (ret != SR_OK) {
 127                 sr_err("Could not reset device. Quitting.");
 128                 goto err_close_ftdic;
 129         }
 130         write_shortcommand(devc, CMD_ID);
 131
 132         /* Read the response data. */
 133         bytes_read = ftdi_read_data(devc->ftdic, (uint8_t *)buf, 4);
 134         if (bytes_read < 0) {
 135                 sr_err("Failed to read FTDI data (%d): %s.",
 136                        bytes_read, ftdi_get_error_string(devc->ftdic));
 137                 goto err_close_ftdic;
 138         }
 139         if (bytes_read == 0) {
 140                 goto err_close_ftdic;
 141         }
 142
 143         if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4))
 144                 goto err_close_ftdic;
 145
 146         /* Definitely using the OLS protocol, check if it supports
 147          * the metadata command.
 148          */
 149         write_shortcommand(devc, CMD_METADATA);
 150
 151         /* Read the metadata. */
 152         bytes_read = ftdi_read_data(devc->ftdic, (uint8_t *)buf, 64);
 153         if (bytes_read < 0) {
 154                 sr_err("Failed to read FTDI data (%d): %s.",
 155                        bytes_read, ftdi_get_error_string(devc->ftdic));
 156                 goto err_close_ftdic;
 157         }
 158         if (bytes_read == 0) {
 159                 goto err_close_ftdic;
 160         }
 161
 162         p_ols_close(devc);
 163
 164         /* Parse the metadata. */
 165         sdi = p_ols_get_metadata((uint8_t *)buf, bytes_read, devc);
 166
 167         /* Configure samplerate and divider. */
 168         if (p_ols_set_samplerate(sdi, DEFAULT_SAMPLERATE) != SR_OK)
 169                 sr_dbg("Failed to set default samplerate (%"PRIu64").",
 170                                 DEFAULT_SAMPLERATE);
 171
 172         devices = g_slist_append(devices, sdi);
 173
 174         return std_scan_complete(di, devices);
 175
 176 err_close_ftdic:
 177         p_ols_close(devc);
 178 err_free_ftdic:
 179         ftdi_free(devc->ftdic);
 180 err_free_ftdi_buf:
 181         g_free(devc->ftdi_buf);
 182         g_free(devc);
 183
 184         return NULL;
 185 }
 186
 187 static void clear_helper(struct dev_context *devc)
 188 {
 189         ftdi_free(devc->ftdic);
 190         g_free(devc->ftdi_buf);
 191 }
 192
 193 static int dev_clear(const struct sr_dev_driver *di)
 194 {
 195         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 196 }
 197
 198 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 199                 const struct sr_channel_group *cg)
 200 {
 201         struct dev_context *devc;
 202
 203         (void)cg;
 204
 205         if (!sdi)
 206                 return SR_ERR_ARG;
 207
 208         devc = sdi->priv;
 209         switch (key) {
 210         case SR_CONF_SAMPLERATE:
 211                 *data = g_variant_new_uint64(devc->cur_samplerate);
 212                 break;
 213         case SR_CONF_CAPTURE_RATIO:
 214                 *data = g_variant_new_uint64(devc->capture_ratio);
 215                 break;
 216         case SR_CONF_LIMIT_SAMPLES:
 217                 *data = g_variant_new_uint64(devc->limit_samples);
 218                 break;
 219         case SR_CONF_PATTERN_MODE:
 220                 if (devc->flag_reg & FLAG_EXTERNAL_TEST_MODE)
 221                         *data = g_variant_new_string(STR_PATTERN_EXTERNAL);
 222                 else if (devc->flag_reg & FLAG_INTERNAL_TEST_MODE)
 223                         *data = g_variant_new_string(STR_PATTERN_INTERNAL);
 224                 else
 225                         *data = g_variant_new_string(STR_PATTERN_NONE);
 226                 break;
 227         case SR_CONF_RLE:
 228                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_RLE ? TRUE : FALSE);
 229                 break;
 230         case SR_CONF_EXTERNAL_CLOCK:
 231                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_CLOCK_EXTERNAL ? TRUE : FALSE);
 232                 break;
 233         default:
 234                 return SR_ERR_NA;
 235         }
 236
 237         return SR_OK;
 238 }
 239
 240 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 241                 const struct sr_channel_group *cg)
 242 {
 243         struct dev_context *devc;
 244         uint16_t flag;
 245         uint64_t tmp_u64;
 246         int ret;
 247         const char *stropt;
 248
 249         (void)cg;
 250
 251         devc = sdi->priv;
 252
 253         switch (key) {
 254         case SR_CONF_SAMPLERATE:
 255                 tmp_u64 = g_variant_get_uint64(data);
 256                 if (tmp_u64 < samplerates[0] || tmp_u64 > samplerates[1])
 257                         return SR_ERR_SAMPLERATE;
 258                 ret = p_ols_set_samplerate(sdi, g_variant_get_uint64(data));
 259                 break;
 260         case SR_CONF_LIMIT_SAMPLES:
 261                 tmp_u64 = g_variant_get_uint64(data);
 262                 if (tmp_u64 < MIN_NUM_SAMPLES)
 263                         return SR_ERR;
 264                 devc->limit_samples = tmp_u64;
 265                 ret = SR_OK;
 266                 break;
 267         case SR_CONF_CAPTURE_RATIO:
 268                 devc->capture_ratio = g_variant_get_uint64(data);
 269                 if (devc->capture_ratio < 0 || devc->capture_ratio > 100)
 270                         ret = SR_ERR;
 271                 else
 272                         ret = SR_OK;
 273                 break;
 274         case SR_CONF_EXTERNAL_CLOCK:
 275                 if (g_variant_get_boolean(data)) {
 276                         sr_info("Enabling external clock.");
 277                         devc->flag_reg |= FLAG_CLOCK_EXTERNAL;
 278                 } else {
 279                         sr_info("Disabled external clock.");
 280                         devc->flag_reg &= ~FLAG_CLOCK_EXTERNAL;
 281                 }
 282                 ret = SR_OK;
 283                 break;
 284         case SR_CONF_PATTERN_MODE:
 285                 stropt = g_variant_get_string(data, NULL);
 286                 ret = SR_OK;
 287                 flag = 0xffff;
 288                 if (!strcmp(stropt, STR_PATTERN_NONE)) {
 289                         sr_info("Disabling test modes.");
 290                         flag = 0x0000;
 291                 }else if (!strcmp(stropt, STR_PATTERN_INTERNAL)) {
 292                         sr_info("Enabling internal test mode.");
 293                         flag = FLAG_INTERNAL_TEST_MODE;
 294                 } else if (!strcmp(stropt, STR_PATTERN_EXTERNAL)) {
 295                         sr_info("Enabling external test mode.");
 296                         flag = FLAG_EXTERNAL_TEST_MODE;
 297                 } else {
 298                         ret = SR_ERR;
 299                 }
 300                 if (flag != 0xffff) {
 301                         devc->flag_reg &= ~(FLAG_INTERNAL_TEST_MODE | FLAG_EXTERNAL_TEST_MODE);
 302                         devc->flag_reg |= flag;
 303                 }
 304                 break;
 305         case SR_CONF_SWAP:
 306                 if (g_variant_get_boolean(data)) {
 307                         sr_info("Enabling channel swapping.");
 308                         devc->flag_reg |= FLAG_SWAP_CHANNELS;
 309                 } else {
 310                         sr_info("Disabling channel swapping.");
 311                         devc->flag_reg &= ~FLAG_SWAP_CHANNELS;
 312                 }
 313                 ret = SR_OK;
 314                 break;
 315
 316         case SR_CONF_RLE:
 317                 if (g_variant_get_boolean(data)) {
 318                         sr_info("Enabling RLE.");
 319                         devc->flag_reg |= FLAG_RLE;
 320                 } else {
 321                         sr_info("Disabling RLE.");
 322                         devc->flag_reg &= ~FLAG_RLE;
 323                 }
 324                 ret = SR_OK;
 325                 break;
 326         default:
 327                 ret = SR_ERR_NA;
 328         }
 329
 330         return ret;
 331 }
 332
 333 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 334                 const struct sr_channel_group *cg)
 335 {
 336         struct dev_context *devc;
 337         GVariant *grange[2];
 338         int num_pols_changrp, i;
 339
 340         switch (key) {
 341         case SR_CONF_DEVICE_OPTIONS:
 342                 return STD_CONFIG_LIST(key, data, sdi, cg, NULL, drvopts, devopts);
 343         case SR_CONF_SAMPLERATE:
 344                 *data = std_gvar_samplerates_steps(samplerates, ARRAY_SIZE(samplerates));
 345                 break;
 346         case SR_CONF_TRIGGER_MATCH:
 347                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 348                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 349                                 sizeof(int32_t));
 350                 break;
 351         case SR_CONF_PATTERN_MODE:
 352                 *data = g_variant_new_strv(patterns, ARRAY_SIZE(patterns));
 353                 break;
 354         case SR_CONF_LIMIT_SAMPLES:
 355                 if (!sdi)
 356                         return SR_ERR_ARG;
 357                 devc = sdi->priv;
 358                 if (devc->flag_reg & FLAG_RLE)
 359                         return SR_ERR_NA;
 360                 if (devc->max_samplebytes == 0)
 361                         /* Device didn't specify sample memory size in metadata. */
 362                         return SR_ERR_NA;
 363                 /*
 364                  * Channel groups are turned off if no channels in that group are
 365                  * enabled, making more room for samples for the enabled group.
 366                 */
 367                 pols_channel_mask(sdi);
 368                 num_pols_changrp = 0;
 369                 for (i = 0; i < 4; i++) {
 370                         if (devc->channel_mask & (0xff << (i * 8)))
 371                                 num_pols_changrp++;
 372                 }
 373                 /* 3 channel groups takes as many bytes as 4 channel groups */
 374                 if (num_pols_changrp == 3)
 375                         num_pols_changrp = 4;
 376                 grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 377                 if (num_pols_changrp)
 378                         grange[1] = g_variant_new_uint64(devc->max_samplebytes / num_pols_changrp);
 379                 else
 380                         grange[1] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 381                 *data = g_variant_new_tuple(grange, 2);
 382                 break;
 383         default:
 384                 return SR_ERR_NA;
 385         }
 386
 387         return SR_OK;
 388 }
 389
 390 static int dev_open(struct sr_dev_inst *sdi)
 391 {
 392         struct dev_context *devc;
 393
 394         devc = sdi->priv;
 395
 396         return p_ols_open(devc);
 397 }
 398
 399 static int dev_close(struct sr_dev_inst *sdi)
 400 {
 401         struct dev_context *devc;
 402
 403         devc = sdi->priv;
 404
 405         return p_ols_close(devc);
 406 }
 407
 408 static int set_trigger(const struct sr_dev_inst *sdi, int stage)
 409 {
 410         struct dev_context *devc;
 411         uint8_t cmd, arg[4];
 412
 413         devc = sdi->priv;
 414
 415         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
 416         arg[0] = devc->trigger_mask[stage] & 0xff;
 417         arg[1] = (devc->trigger_mask[stage] >> 8) & 0xff;
 418         arg[2] = (devc->trigger_mask[stage] >> 16) & 0xff;
 419         arg[3] = (devc->trigger_mask[stage] >> 24) & 0xff;
 420         if (write_longcommand(devc, cmd, arg) != SR_OK)
 421                 return SR_ERR;
 422
 423         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
 424         arg[0] = devc->trigger_value[stage] & 0xff;
 425         arg[1] = (devc->trigger_value[stage] >> 8) & 0xff;
 426         arg[2] = (devc->trigger_value[stage] >> 16) & 0xff;
 427         arg[3] = (devc->trigger_value[stage] >> 24) & 0xff;
 428         if (write_longcommand(devc, cmd, arg) != SR_OK)
 429                 return SR_ERR;
 430
 431         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
 432         arg[0] = arg[1] = arg[3] = 0x00;
 433         arg[2] = stage;
 434         if (stage == devc->num_stages)
 435                 /* Last stage, fire when this one matches. */
 436                 arg[3] |= TRIGGER_START;
 437         if (write_longcommand(devc, cmd, arg) != SR_OK)
 438                 return SR_ERR;
 439
 440         cmd = CMD_SET_TRIGGER_EDGE + stage * 4;
 441         arg[0] = devc->trigger_edge[stage] & 0xff;
 442         arg[1] = (devc->trigger_edge[stage] >> 8) & 0xff;
 443         arg[2] = (devc->trigger_edge[stage] >> 16) & 0xff;
 444         arg[3] = (devc->trigger_edge[stage] >> 24) & 0xff;
 445         if (write_longcommand(devc, cmd, arg) != SR_OK)
 446                 return SR_ERR;
 447
 448         return SR_OK;
 449 }
 450
 451 static int disable_trigger(const struct sr_dev_inst *sdi, int stage)
 452 {
 453         struct dev_context *devc;
 454         uint8_t cmd, arg[4];
 455
 456         devc = sdi->priv;
 457
 458         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
 459         arg[0] = arg[1] = arg[2] = arg[3] = 0x00;
 460         if (write_longcommand(devc, cmd, arg) != SR_OK)
 461                 return SR_ERR;
 462
 463         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
 464         if (write_longcommand(devc, cmd, arg) != SR_OK)
 465                 return SR_ERR;
 466
 467         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
 468         arg[2] = 0x03;
 469         if (write_longcommand(devc, cmd, arg) != SR_OK)
 470                 return SR_ERR;
 471
 472         cmd = CMD_SET_TRIGGER_EDGE + stage * 4;
 473         arg[2] = 0x00;
 474         if (write_longcommand(devc, cmd, arg) != SR_OK)
 475                 return SR_ERR;
 476
 477         return SR_OK;
 478 }
 479
 480 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 481 {
 482         struct dev_context *devc;
 483         uint32_t samplecount, readcount, delaycount;
 484         uint8_t pols_changrp_mask, arg[4];
 485         uint16_t flag_tmp;
 486         int num_pols_changrp, samplespercount;
 487         int ret, i;
 488
 489         devc = sdi->priv;
 490
 491         pols_channel_mask(sdi);
 492
 493         /*
 494          * Enable/disable channel groups in the flag register according to the
 495          * channel mask. Calculate this here, because num_pols_changrp is
 496          * needed to limit readcount.
 497          */
 498         pols_changrp_mask = 0;
 499         num_pols_changrp = 0;
 500         for (i = 0; i < 4; i++) {
 501                 if (devc->channel_mask & (0xff << (i * 8))) {
 502                         pols_changrp_mask |= (1 << i);
 503                         num_pols_changrp++;
 504                 }
 505         }
 506         /* 3 channel groups takes as many bytes as 4 channel groups */
 507         if (num_pols_changrp == 3)
 508                 num_pols_changrp = 4;
 509         /* maximum number of samples (or RLE counts) the buffer memory can hold */
 510         devc->max_samples = devc->max_samplebytes / num_pols_changrp;
 511
 512         /*
 513          * Limit readcount to prevent reading past the end of the hardware
 514          * buffer.
 515          */
 516         sr_dbg("max_samples = %d", devc->max_samples);
 517         sr_dbg("limit_samples = %" PRIu64, devc->limit_samples);
 518         samplecount = MIN(devc->max_samples, devc->limit_samples);
 519         sr_dbg("Samplecount = %d", samplecount);
 520
 521         /* In demux mode the OLS is processing two samples per clock */
 522         if (devc->flag_reg & FLAG_DEMUX) {
 523                 samplespercount = 8;
 524         }
 525         else {
 526                 samplespercount = 4;
 527         }
 528
 529         readcount = samplecount / samplespercount;
 530
 531         /* Rather read too many samples than too few. */
 532         if (samplecount % samplespercount != 0)
 533                 readcount++;
 534
 535         /* Basic triggers. */
 536         if (pols_convert_trigger(sdi) != SR_OK) {
 537                 sr_err("Failed to configure channels.");
 538                 return SR_ERR;
 539         }
 540
 541         if (devc->num_stages > 0) {
 542                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
 543                 devc->trigger_at = (readcount - delaycount) * samplespercount - devc->num_stages;
 544                 for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 545                         if (i <= devc->num_stages) {
 546                                 sr_dbg("Setting p-ols stage %d trigger.", i);
 547                                 if ((ret = set_trigger(sdi, i)) != SR_OK)
 548                                         return ret;
 549                         }
 550                         else {
 551                                 sr_dbg("Disabling p-ols stage %d trigger.", i);
 552                                 if ((ret = disable_trigger(sdi, i)) != SR_OK)
 553                                         return ret;
 554                         }
 555                 }
 556         } else {
 557                 /* No triggers configured, force trigger on first stage. */
 558                 sr_dbg("Forcing trigger at stage 0.");
 559                 if ((ret = set_trigger(sdi, 0)) != SR_OK)
 560                         return ret;
 561                 delaycount = readcount;
 562         }
 563
 564         /* Samplerate. */
 565         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
 566                         devc->cur_samplerate, devc->cur_samplerate_divider);
 567         arg[0] = devc->cur_samplerate_divider & 0xff;
 568         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
 569         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
 570         arg[3] = 0x00;
 571         if (write_longcommand(devc, CMD_SET_DIVIDER, arg) != SR_OK)
 572                 return SR_ERR;
 573
 574         /* Send extended sample limit and pre/post-trigger capture ratio. */
 575         arg[0] = ((readcount - 1) & 0xff);
 576         arg[1] = ((readcount - 1) & 0xff00) >> 8;
 577         arg[2] = ((readcount - 1) & 0xff0000) >> 16;
 578         arg[3] = ((readcount - 1) & 0xff000000) >> 24;
 579         if (write_longcommand(devc, CMD_CAPTURE_DELAY, arg) != SR_OK)
 580                 return SR_ERR;
 581         arg[0] = ((delaycount - 1) & 0xff);
 582         arg[1] = ((delaycount - 1) & 0xff00) >> 8;
 583         arg[2] = ((delaycount - 1) & 0xff0000) >> 16;
 584         arg[3] = ((delaycount - 1) & 0xff000000) >> 24;
 585         if (write_longcommand(devc, CMD_CAPTURE_COUNT, arg) != SR_OK)
 586                 return SR_ERR;
 587
 588         /* Flag register. */
 589         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s",
 590                         devc->flag_reg & FLAG_INTERNAL_TEST_MODE ? "on": "off",
 591                         devc->flag_reg & FLAG_EXTERNAL_TEST_MODE ? "on": "off",
 592                         devc->flag_reg & FLAG_RLE ? "on" : "off",
 593                         devc->flag_reg & FLAG_FILTER ? "on": "off",
 594                         devc->flag_reg & FLAG_DEMUX ? "on" : "off");
 595
 596         /*
 597         * Enable/disable OLS channel groups in the flag register according
 598         * to the channel mask. 1 means "disable channel".
 599         */
 600         devc->flag_reg &= ~0x3c;
 601         devc->flag_reg |= ~(pols_changrp_mask << 2) & 0x3c;
 602         sr_dbg("flag_reg = %x", devc->flag_reg);
 603
 604         /*
 605         * In demux mode the OLS is processing two 8-bit or 16-bit samples
 606         * in parallel and for this to work the lower two bits of the four
 607         * "channel_disable" bits must be replicated to the upper two bits.
 608         */
 609         flag_tmp = devc->flag_reg;
 610         if (devc->flag_reg & FLAG_DEMUX) {
 611                 flag_tmp &= ~0x30;
 612                 flag_tmp |= ~(pols_changrp_mask << 4) & 0x30;
 613         }
 614         arg[0] = flag_tmp & 0xff;
 615         arg[1] = flag_tmp >> 8;
 616         arg[2] = arg[3] = 0x00;
 617         if (write_longcommand(devc, CMD_SET_FLAGS, arg) != SR_OK)
 618                 return SR_ERR;
 619
 620         /* Start acquisition on the device. */
 621         if (write_shortcommand(devc, CMD_RUN) != SR_OK)
 622                 return SR_ERR;
 623
 624         /* Reset all operational states. */
 625         devc->rle_count = devc->num_transfers = 0;
 626         devc->num_samples = devc->num_bytes = 0;
 627         devc->cnt_bytes = devc->cnt_samples = devc->cnt_samples_rle = 0;
 628         memset(devc->sample, 0, 4);
 629
 630         std_session_send_df_header(sdi);
 631
 632         /* Hook up a dummy handler to receive data from the device. */
 633         sr_session_source_add(sdi->session, -1, 0, 10, p_ols_receive_data,
 634                                 (struct sr_dev_inst *)sdi);
 635
 636         return SR_OK;
 637 }
 638
 639 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 640 {
 641         struct dev_context *devc;
 642
 643         devc = sdi->priv;
 644
 645         write_shortcommand(devc, CMD_RESET);
 646         write_shortcommand(devc, CMD_RESET);
 647         write_shortcommand(devc, CMD_RESET);
 648         write_shortcommand(devc, CMD_RESET);
 649         write_shortcommand(devc, CMD_RESET);
 650
 651         sr_session_source_remove(sdi->session, -1);
 652
 653         std_session_send_df_end(sdi);
 654
 655         return SR_OK;
 656 }
 657
 658 SR_PRIV struct sr_dev_driver p_ols_driver_info = {
 659         .name = "p-ols",
 660         .longname = "Pipistrello OLS",
 661         .api_version = 1,
 662         .init = std_init,
 663         .cleanup = std_cleanup,
 664         .scan = scan,
 665         .dev_list = std_dev_list,
 666         .dev_clear = dev_clear,
 667         .config_get = config_get,
 668         .config_set = config_set,
 669         .config_list = config_list,
 670         .dev_open = dev_open,
 671         .dev_close = dev_close,
 672         .dev_acquisition_start = dev_acquisition_start,
 673         .dev_acquisition_stop = dev_acquisition_stop,
 674         .context = NULL,
 675 };
 676 SR_REGISTER_DEV_DRIVER(p_ols_driver_info);