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 devopts[] = {
  24         SR_CONF_LOGIC_ANALYZER,
  25         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  26         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  27         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  28         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  29         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  30         SR_CONF_EXTERNAL_CLOCK | SR_CONF_GET | SR_CONF_SET,
  31         SR_CONF_SWAP | SR_CONF_SET,
  32         SR_CONF_RLE | SR_CONF_GET | SR_CONF_SET,
  33 };
  34
  35 static const int32_t trigger_matches[] = {
  36         SR_TRIGGER_ZERO,
  37         SR_TRIGGER_ONE,
  38         SR_TRIGGER_RISING,
  39         SR_TRIGGER_FALLING,
  40 };
  41
  42 #define STR_PATTERN_NONE     "None"
  43 #define STR_PATTERN_EXTERNAL "External"
  44 #define STR_PATTERN_INTERNAL "Internal"
  45
  46 /* Supported methods of test pattern outputs */
  47 enum {
  48         /**
  49          * Capture pins 31:16 (unbuffered wing) output a test pattern
  50          * that can captured on pins 0:15.
  51          */
  52         PATTERN_EXTERNAL,
  53
  54         /** Route test pattern internally to capture buffer. */
  55         PATTERN_INTERNAL,
  56 };
  57
  58 static const char *patterns[] = {
  59         STR_PATTERN_NONE,
  60         STR_PATTERN_EXTERNAL,
  61         STR_PATTERN_INTERNAL,
  62 };
  63
  64 /* Channels are numbered 0-31 (on the PCB silkscreen). */
  65 SR_PRIV const char *p_ols_channel_names[] = {
  66         "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
  67         "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23",
  68         "24", "25", "26", "27", "28", "29", "30", "31",
  69 };
  70
  71 /* Default supported samplerates, can be overridden by device metadata. */
  72 static const uint64_t samplerates[] = {
  73         SR_HZ(10),
  74         SR_MHZ(200),
  75         SR_HZ(1),
  76 };
  77
  78 SR_PRIV struct sr_dev_driver p_ols_driver_info;
  79
  80 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  81 {
  82         return std_init(di, sr_ctx, LOG_PREFIX);
  83 }
  84
  85 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  86 {
  87         struct sr_dev_inst *sdi;
  88         struct drv_context *drvc;
  89         struct dev_context *devc;
  90         GSList *devices;
  91         int ret, i;
  92         char buf[70];
  93         int bytes_read;
  94
  95         (void)options;
  96
  97         drvc = di->context;
  98
  99         devices = NULL;
 100
 101         /* Allocate memory for our private device context. */
 102         devc = g_malloc0(sizeof(struct dev_context));
 103
 104         /* Device-specific settings */
 105         devc->max_samplebytes = devc->max_samplerate = devc->protocol_version = 0;
 106
 107         /* Acquisition settings */
 108         devc->limit_samples = devc->capture_ratio = 0;
 109         devc->trigger_at = -1;
 110         devc->channel_mask = 0xffffffff;
 111         devc->flag_reg = 0;
 112
 113         /* Allocate memory for the incoming ftdi data. */
 114         devc->ftdi_buf = g_malloc0(FTDI_BUF_SIZE);
 115
 116         /* Allocate memory for the FTDI context (ftdic) and initialize it. */
 117         if (!(devc->ftdic = ftdi_new())) {
 118                 sr_err("Failed to initialize libftdi.");
 119                 goto err_free_ftdi_buf;;
 120         }
 121
 122         /* Try to open the FTDI device */
 123         if (p_ols_open(devc) != SR_OK) {
 124                 goto err_free_ftdic;
 125         }
 126
 127         /* The discovery procedure is like this: first send the Reset
 128          * command (0x00) 5 times, since the device could be anywhere
 129          * in a 5-byte command. Then send the ID command (0x02).
 130          * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
 131          * have a match.
 132          */
 133
 134         ret = SR_OK;
 135         for (i = 0; i < 5; i++) {
 136                 if ((ret = write_shortcommand(devc, CMD_RESET)) != SR_OK) {
 137                         break;
 138                 }
 139         }
 140         if (ret != SR_OK) {
 141                 sr_err("Could not reset device. Quitting.");
 142                 goto err_close_ftdic;
 143         }
 144         write_shortcommand(devc, CMD_ID);
 145
 146         /* Read the response data. */
 147         bytes_read = ftdi_read_data(devc->ftdic, (uint8_t *)buf, 4);
 148         if (bytes_read < 0) {
 149                 sr_err("Failed to read FTDI data (%d): %s.",
 150                        bytes_read, ftdi_get_error_string(devc->ftdic));
 151                 goto err_close_ftdic;
 152         }
 153         if (bytes_read == 0) {
 154                 goto err_close_ftdic;
 155         }
 156
 157         if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4))
 158                 goto err_close_ftdic;
 159
 160         /* Definitely using the OLS protocol, check if it supports
 161          * the metadata command.
 162          */
 163         write_shortcommand(devc, CMD_METADATA);
 164
 165         /* Read the metadata. */
 166         bytes_read = ftdi_read_data(devc->ftdic, (uint8_t *)buf, 64);
 167         if (bytes_read < 0) {
 168                 sr_err("Failed to read FTDI data (%d): %s.",
 169                        bytes_read, ftdi_get_error_string(devc->ftdic));
 170                 goto err_close_ftdic;
 171         }
 172         if (bytes_read == 0) {
 173                 goto err_close_ftdic;
 174         }
 175
 176         /* Close device. We'll reopen it again when we need it. */
 177         p_ols_close(devc);
 178
 179         /* Parse the metadata. */
 180         sdi = p_ols_get_metadata((uint8_t *)buf, bytes_read, devc);
 181
 182         /* Configure samplerate and divider. */
 183         if (p_ols_set_samplerate(sdi, DEFAULT_SAMPLERATE) != SR_OK)
 184                 sr_dbg("Failed to set default samplerate (%"PRIu64").",
 185                                 DEFAULT_SAMPLERATE);
 186
 187         drvc->instances = g_slist_append(drvc->instances, sdi);
 188         devices = g_slist_append(devices, sdi);
 189
 190         return devices;
 191
 192 err_close_ftdic:
 193         p_ols_close(devc);
 194 err_free_ftdic:
 195         ftdi_free(devc->ftdic); /* NOT free() or g_free()! */
 196 err_free_ftdi_buf:
 197         g_free(devc->ftdi_buf);
 198         g_free(devc);
 199
 200         return NULL;
 201 }
 202
 203 static void clear_helper(void *priv)
 204 {
 205         struct dev_context *devc;
 206
 207         devc = priv;
 208
 209         ftdi_free(devc->ftdic);
 210         g_free(devc->ftdi_buf);
 211 }
 212
 213 static int dev_clear(const struct sr_dev_driver *di)
 214 {
 215         return std_dev_clear(di, clear_helper);
 216 }
 217
 218 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 219                 const struct sr_channel_group *cg)
 220 {
 221         struct dev_context *devc;
 222
 223         (void)cg;
 224
 225         if (!sdi)
 226                 return SR_ERR_ARG;
 227
 228         devc = sdi->priv;
 229         switch (key) {
 230         case SR_CONF_SAMPLERATE:
 231                 *data = g_variant_new_uint64(devc->cur_samplerate);
 232                 break;
 233         case SR_CONF_CAPTURE_RATIO:
 234                 *data = g_variant_new_uint64(devc->capture_ratio);
 235                 break;
 236         case SR_CONF_LIMIT_SAMPLES:
 237                 *data = g_variant_new_uint64(devc->limit_samples);
 238                 break;
 239         case SR_CONF_PATTERN_MODE:
 240                 if (devc->flag_reg & FLAG_EXTERNAL_TEST_MODE)
 241                         *data = g_variant_new_string(STR_PATTERN_EXTERNAL);
 242                 else if (devc->flag_reg & FLAG_INTERNAL_TEST_MODE)
 243                         *data = g_variant_new_string(STR_PATTERN_INTERNAL);
 244                 else
 245                         *data = g_variant_new_string(STR_PATTERN_NONE);
 246                 break;
 247         case SR_CONF_RLE:
 248                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_RLE ? TRUE : FALSE);
 249                 break;
 250         case SR_CONF_EXTERNAL_CLOCK:
 251                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_CLOCK_EXTERNAL ? TRUE : FALSE);
 252                 break;
 253         default:
 254                 return SR_ERR_NA;
 255         }
 256
 257         return SR_OK;
 258 }
 259
 260 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 261                 const struct sr_channel_group *cg)
 262 {
 263         struct dev_context *devc;
 264         uint16_t flag;
 265         uint64_t tmp_u64;
 266         int ret;
 267         const char *stropt;
 268
 269         (void)cg;
 270
 271         if (sdi->status != SR_ST_ACTIVE)
 272                 return SR_ERR_DEV_CLOSED;
 273
 274         devc = sdi->priv;
 275
 276         switch (key) {
 277         case SR_CONF_SAMPLERATE:
 278                 tmp_u64 = g_variant_get_uint64(data);
 279                 if (tmp_u64 < samplerates[0] || tmp_u64 > samplerates[1])
 280                         return SR_ERR_SAMPLERATE;
 281                 ret = p_ols_set_samplerate(sdi, g_variant_get_uint64(data));
 282                 break;
 283         case SR_CONF_LIMIT_SAMPLES:
 284                 tmp_u64 = g_variant_get_uint64(data);
 285                 if (tmp_u64 < MIN_NUM_SAMPLES)
 286                         return SR_ERR;
 287                 devc->limit_samples = tmp_u64;
 288                 ret = SR_OK;
 289                 break;
 290         case SR_CONF_CAPTURE_RATIO:
 291                 devc->capture_ratio = g_variant_get_uint64(data);
 292                 if (devc->capture_ratio < 0 || devc->capture_ratio > 100)
 293                         ret = SR_ERR;
 294                 else
 295                         ret = SR_OK;
 296                 break;
 297         case SR_CONF_EXTERNAL_CLOCK:
 298                 if (g_variant_get_boolean(data)) {
 299                         sr_info("Enabling external clock.");
 300                         devc->flag_reg |= FLAG_CLOCK_EXTERNAL;
 301                 } else {
 302                         sr_info("Disabled external clock.");
 303                         devc->flag_reg &= ~FLAG_CLOCK_EXTERNAL;
 304                 }
 305                 ret = SR_OK;
 306                 break;
 307         case SR_CONF_PATTERN_MODE:
 308                 stropt = g_variant_get_string(data, NULL);
 309                 ret = SR_OK;
 310                 flag = 0xffff;
 311                 if (!strcmp(stropt, STR_PATTERN_NONE)) {
 312                         sr_info("Disabling test modes.");
 313                         flag = 0x0000;
 314                 }else if (!strcmp(stropt, STR_PATTERN_INTERNAL)) {
 315                         sr_info("Enabling internal test mode.");
 316                         flag = FLAG_INTERNAL_TEST_MODE;
 317                 } else if (!strcmp(stropt, STR_PATTERN_EXTERNAL)) {
 318                         sr_info("Enabling external test mode.");
 319                         flag = FLAG_EXTERNAL_TEST_MODE;
 320                 } else {
 321                         ret = SR_ERR;
 322                 }
 323                 if (flag != 0xffff) {
 324                         devc->flag_reg &= ~(FLAG_INTERNAL_TEST_MODE | FLAG_EXTERNAL_TEST_MODE);
 325                         devc->flag_reg |= flag;
 326                 }
 327                 break;
 328         case SR_CONF_SWAP:
 329                 if (g_variant_get_boolean(data)) {
 330                         sr_info("Enabling channel swapping.");
 331                         devc->flag_reg |= FLAG_SWAP_CHANNELS;
 332                 } else {
 333                         sr_info("Disabling channel swapping.");
 334                         devc->flag_reg &= ~FLAG_SWAP_CHANNELS;
 335                 }
 336                 ret = SR_OK;
 337                 break;
 338
 339         case SR_CONF_RLE:
 340                 if (g_variant_get_boolean(data)) {
 341                         sr_info("Enabling RLE.");
 342                         devc->flag_reg |= FLAG_RLE;
 343                 } else {
 344                         sr_info("Disabling RLE.");
 345                         devc->flag_reg &= ~FLAG_RLE;
 346                 }
 347                 ret = SR_OK;
 348                 break;
 349         default:
 350                 ret = SR_ERR_NA;
 351         }
 352
 353         return ret;
 354 }
 355
 356 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 357                 const struct sr_channel_group *cg)
 358 {
 359         struct dev_context *devc;
 360         GVariant *gvar, *grange[2];
 361         GVariantBuilder gvb;
 362         int num_pols_changrp, i;
 363
 364         (void)cg;
 365
 366         switch (key) {
 367         case SR_CONF_DEVICE_OPTIONS:
 368                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 369                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 370                 break;
 371         case SR_CONF_SAMPLERATE:
 372                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 373                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
 374                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
 375                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
 376                 *data = g_variant_builder_end(&gvb);
 377                 break;
 378         case SR_CONF_TRIGGER_MATCH:
 379                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 380                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 381                                 sizeof(int32_t));
 382                 break;
 383         case SR_CONF_PATTERN_MODE:
 384                 *data = g_variant_new_strv(patterns, ARRAY_SIZE(patterns));
 385                 break;
 386         case SR_CONF_LIMIT_SAMPLES:
 387                 if (!sdi)
 388                         return SR_ERR_ARG;
 389                 devc = sdi->priv;
 390                 if (devc->flag_reg & FLAG_RLE)
 391                         return SR_ERR_NA;
 392                 if (devc->max_samplebytes == 0)
 393                         /* Device didn't specify sample memory size in metadata. */
 394                         return SR_ERR_NA;
 395                 /*
 396                  * Channel groups are turned off if no channels in that group are
 397                  * enabled, making more room for samples for the enabled group.
 398                 */
 399                 pols_channel_mask(sdi);
 400                 num_pols_changrp = 0;
 401                 for (i = 0; i < 4; i++) {
 402                         if (devc->channel_mask & (0xff << (i * 8)))
 403                                 num_pols_changrp++;
 404                 }
 405                 /* 3 channel groups takes as many bytes as 4 channel groups */
 406                 if (num_pols_changrp == 3)
 407                         num_pols_changrp = 4;
 408                 grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 409                 if (num_pols_changrp)
 410                         grange[1] = g_variant_new_uint64(devc->max_samplebytes / num_pols_changrp);
 411                 else
 412                         grange[1] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 413                 *data = g_variant_new_tuple(grange, 2);
 414                 break;
 415         default:
 416                 return SR_ERR_NA;
 417         }
 418
 419         return SR_OK;
 420 }
 421
 422 static int dev_open(struct sr_dev_inst *sdi)
 423 {
 424         struct dev_context *devc;
 425
 426         devc = sdi->priv;
 427
 428         if (p_ols_open(devc) != SR_OK) {
 429                 return SR_ERR;
 430         } else {
 431                 sdi->status = SR_ST_ACTIVE;
 432                 return SR_OK;
 433         }
 434 }
 435
 436 static int dev_close(struct sr_dev_inst *sdi)
 437 {
 438         int ret;
 439         struct dev_context *devc;
 440
 441         ret = SR_OK;
 442         devc = sdi->priv;
 443
 444         if (sdi->status == SR_ST_ACTIVE) {
 445                 sr_dbg("Status ACTIVE, closing device.");
 446                 ret = p_ols_close(devc);
 447         } else {
 448                 sr_spew("Status not ACTIVE, nothing to do.");
 449         }
 450
 451         sdi->status = SR_ST_INACTIVE;
 452
 453         return ret;
 454 }
 455
 456 static int set_trigger(const struct sr_dev_inst *sdi, int stage)
 457 {
 458         struct dev_context *devc;
 459         uint8_t cmd, arg[4];
 460
 461         devc = sdi->priv;
 462
 463         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
 464         arg[0] = devc->trigger_mask[stage] & 0xff;
 465         arg[1] = (devc->trigger_mask[stage] >> 8) & 0xff;
 466         arg[2] = (devc->trigger_mask[stage] >> 16) & 0xff;
 467         arg[3] = (devc->trigger_mask[stage] >> 24) & 0xff;
 468         if (write_longcommand(devc, cmd, arg) != SR_OK)
 469                 return SR_ERR;
 470
 471         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
 472         arg[0] = devc->trigger_value[stage] & 0xff;
 473         arg[1] = (devc->trigger_value[stage] >> 8) & 0xff;
 474         arg[2] = (devc->trigger_value[stage] >> 16) & 0xff;
 475         arg[3] = (devc->trigger_value[stage] >> 24) & 0xff;
 476         if (write_longcommand(devc, cmd, arg) != SR_OK)
 477                 return SR_ERR;
 478
 479         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
 480         arg[0] = arg[1] = arg[3] = 0x00;
 481         arg[2] = stage;
 482         if (stage == devc->num_stages)
 483                 /* Last stage, fire when this one matches. */
 484                 arg[3] |= TRIGGER_START;
 485         if (write_longcommand(devc, cmd, arg) != SR_OK)
 486                 return SR_ERR;
 487
 488         cmd = CMD_SET_TRIGGER_EDGE + stage * 4;
 489         arg[0] = devc->trigger_edge[stage] & 0xff;
 490         arg[1] = (devc->trigger_edge[stage] >> 8) & 0xff;
 491         arg[2] = (devc->trigger_edge[stage] >> 16) & 0xff;
 492         arg[3] = (devc->trigger_edge[stage] >> 24) & 0xff;
 493         if (write_longcommand(devc, cmd, arg) != SR_OK)
 494                 return SR_ERR;
 495
 496         return SR_OK;
 497 }
 498
 499 static int disable_trigger(const struct sr_dev_inst *sdi, int stage)
 500 {
 501         struct dev_context *devc;
 502         uint8_t cmd, arg[4];
 503
 504         devc = sdi->priv;
 505
 506         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
 507         arg[0] = arg[1] = arg[2] = arg[3] = 0x00;
 508         if (write_longcommand(devc, cmd, arg) != SR_OK)
 509                 return SR_ERR;
 510
 511         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
 512         if (write_longcommand(devc, cmd, arg) != SR_OK)
 513                 return SR_ERR;
 514
 515         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
 516         arg[2] = 0x03;
 517         if (write_longcommand(devc, cmd, arg) != SR_OK)
 518                 return SR_ERR;
 519
 520         cmd = CMD_SET_TRIGGER_EDGE + stage * 4;
 521         arg[2] = 0x00;
 522         if (write_longcommand(devc, cmd, arg) != SR_OK)
 523                 return SR_ERR;
 524
 525         return SR_OK;
 526 }
 527
 528 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 529 {
 530         struct dev_context *devc;
 531         uint32_t samplecount, readcount, delaycount;
 532         uint8_t pols_changrp_mask, arg[4];
 533         uint16_t flag_tmp;
 534         int num_pols_changrp, samplespercount;
 535         int ret, i;
 536
 537         if (sdi->status != SR_ST_ACTIVE)
 538                 return SR_ERR_DEV_CLOSED;
 539
 540         devc = sdi->priv;
 541
 542         pols_channel_mask(sdi);
 543
 544         /*
 545          * Enable/disable channel groups in the flag register according to the
 546          * channel mask. Calculate this here, because num_pols_changrp is
 547          * needed to limit readcount.
 548          */
 549         pols_changrp_mask = 0;
 550         num_pols_changrp = 0;
 551         for (i = 0; i < 4; i++) {
 552                 if (devc->channel_mask & (0xff << (i * 8))) {
 553                         pols_changrp_mask |= (1 << i);
 554                         num_pols_changrp++;
 555                 }
 556         }
 557         /* 3 channel groups takes as many bytes as 4 channel groups */
 558         if (num_pols_changrp == 3)
 559                 num_pols_changrp = 4;
 560         /* maximum number of samples (or RLE counts) the buffer memory can hold */
 561         devc->max_samples = devc->max_samplebytes / num_pols_changrp;
 562
 563         /*
 564          * Limit readcount to prevent reading past the end of the hardware
 565          * buffer.
 566          */
 567         sr_dbg("max_samples = %d", devc->max_samples);
 568         sr_dbg("limit_samples = %" PRIu64, devc->limit_samples);
 569         samplecount = MIN(devc->max_samples, devc->limit_samples);
 570         sr_dbg("Samplecount = %d", samplecount);
 571
 572         /* In demux mode the OLS is processing two samples per clock */
 573         if (devc->flag_reg & FLAG_DEMUX) {
 574                 samplespercount = 8;
 575         }
 576         else {
 577                 samplespercount = 4;
 578         }
 579
 580         readcount = samplecount / samplespercount;
 581
 582         /* Rather read too many samples than too few. */
 583         if (samplecount % samplespercount != 0)
 584                 readcount++;
 585
 586         /* Basic triggers. */
 587         if (pols_convert_trigger(sdi) != SR_OK) {
 588                 sr_err("Failed to configure channels.");
 589                 return SR_ERR;
 590         }
 591
 592         if (devc->num_stages > 0) {
 593                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
 594                 devc->trigger_at = (readcount - delaycount) * samplespercount - devc->num_stages;
 595                 for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 596                         if (i <= devc->num_stages) {
 597                                 sr_dbg("Setting p-ols stage %d trigger.", i);
 598                                 if ((ret = set_trigger(sdi, i)) != SR_OK)
 599                                         return ret;
 600                         }
 601                         else {
 602                                 sr_dbg("Disabling p-ols stage %d trigger.", i);
 603                                 if ((ret = disable_trigger(sdi, i)) != SR_OK)
 604                                         return ret;
 605                         }
 606                 }
 607         } else {
 608                 /* No triggers configured, force trigger on first stage. */
 609                 sr_dbg("Forcing trigger at stage 0.");
 610                 if ((ret = set_trigger(sdi, 0)) != SR_OK)
 611                         return ret;
 612                 delaycount = readcount;
 613         }
 614
 615         /* Samplerate. */
 616         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
 617                         devc->cur_samplerate, devc->cur_samplerate_divider);
 618         arg[0] = devc->cur_samplerate_divider & 0xff;
 619         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
 620         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
 621         arg[3] = 0x00;
 622         if (write_longcommand(devc, CMD_SET_DIVIDER, arg) != SR_OK)
 623                 return SR_ERR;
 624
 625         /* Send extended sample limit and pre/post-trigger capture ratio. */
 626         arg[0] = ((readcount - 1) & 0xff);
 627         arg[1] = ((readcount - 1) & 0xff00) >> 8;
 628         arg[2] = ((readcount - 1) & 0xff0000) >> 16;
 629         arg[3] = ((readcount - 1) & 0xff000000) >> 24;
 630         if (write_longcommand(devc, CMD_CAPTURE_DELAY, arg) != SR_OK)
 631                 return SR_ERR;
 632         arg[0] = ((delaycount - 1) & 0xff);
 633         arg[1] = ((delaycount - 1) & 0xff00) >> 8;
 634         arg[2] = ((delaycount - 1) & 0xff0000) >> 16;
 635         arg[3] = ((delaycount - 1) & 0xff000000) >> 24;
 636         if (write_longcommand(devc, CMD_CAPTURE_COUNT, arg) != SR_OK)
 637                 return SR_ERR;
 638
 639         /* Flag register. */
 640         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s",
 641                         devc->flag_reg & FLAG_INTERNAL_TEST_MODE ? "on": "off",
 642                         devc->flag_reg & FLAG_EXTERNAL_TEST_MODE ? "on": "off",
 643                         devc->flag_reg & FLAG_RLE ? "on" : "off",
 644                         devc->flag_reg & FLAG_FILTER ? "on": "off",
 645                         devc->flag_reg & FLAG_DEMUX ? "on" : "off");
 646
 647         /*
 648         * Enable/disable OLS channel groups in the flag register according
 649         * to the channel mask. 1 means "disable channel".
 650         */
 651         devc->flag_reg &= ~0x3c;
 652         devc->flag_reg |= ~(pols_changrp_mask << 2) & 0x3c;
 653         sr_dbg("flag_reg = %x", devc->flag_reg);
 654
 655         /*
 656         * In demux mode the OLS is processing two 8-bit or 16-bit samples
 657         * in parallel and for this to work the lower two bits of the four
 658         * "channel_disable" bits must be replicated to the upper two bits.
 659         */
 660         flag_tmp = devc->flag_reg;
 661         if (devc->flag_reg & FLAG_DEMUX) {
 662                 flag_tmp &= ~0x30;
 663                 flag_tmp |= ~(pols_changrp_mask << 4) & 0x30;
 664         }
 665         arg[0] = flag_tmp & 0xff;
 666         arg[1] = flag_tmp >> 8;
 667         arg[2] = arg[3] = 0x00;
 668         if (write_longcommand(devc, CMD_SET_FLAGS, arg) != SR_OK)
 669                 return SR_ERR;
 670
 671         /* Start acquisition on the device. */
 672         if (write_shortcommand(devc, CMD_RUN) != SR_OK)
 673                 return SR_ERR;
 674
 675         /* Reset all operational states. */
 676         devc->rle_count = devc->num_transfers = 0;
 677         devc->num_samples = devc->num_bytes = 0;
 678         devc->cnt_bytes = devc->cnt_samples = devc->cnt_samples_rle = 0;
 679         memset(devc->sample, 0, 4);
 680
 681         std_session_send_df_header(sdi, LOG_PREFIX);
 682
 683         /* Hook up a dummy handler to receive data from the device. */
 684         sr_session_source_add(sdi->session, -1, 0, 10, p_ols_receive_data,
 685                                 (struct sr_dev_inst *)sdi);
 686
 687         return SR_OK;
 688 }
 689
 690 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 691 {
 692         struct dev_context *devc;
 693
 694         devc = sdi->priv;
 695
 696         sr_dbg("Stopping acquisition.");
 697         write_shortcommand(devc, CMD_RESET);
 698         write_shortcommand(devc, CMD_RESET);
 699         write_shortcommand(devc, CMD_RESET);
 700         write_shortcommand(devc, CMD_RESET);
 701         write_shortcommand(devc, CMD_RESET);
 702
 703         sr_session_source_remove(sdi->session, -1);
 704
 705         std_session_send_df_end(sdi, LOG_PREFIX);
 706
 707         return SR_OK;
 708 }
 709
 710 SR_PRIV struct sr_dev_driver p_ols_driver_info = {
 711         .name = "p-ols",
 712         .longname = "Pipistrello OLS",
 713         .api_version = 1,
 714         .init = init,
 715         .cleanup = std_cleanup,
 716         .scan = scan,
 717         .dev_list = std_dev_list,
 718         .dev_clear = dev_clear,
 719         .config_get = config_get,
 720         .config_set = config_set,
 721         .config_list = config_list,
 722         .dev_open = dev_open,
 723         .dev_close = dev_close,
 724         .dev_acquisition_start = dev_acquisition_start,
 725         .dev_acquisition_stop = dev_acquisition_stop,
 726         .context = NULL,
 727 };