src/lcr/es51919.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Janne Huttunen <jahuttun@gmail.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 <stdint.h>
  22 #include <string.h>
  23 #include <math.h>
  24 #include <glib.h>
  25 #include <libsigrok/libsigrok.h>
  26 #include "libsigrok-internal.h"
  27
  28 #define LOG_PREFIX "es51919"
  29
  30 struct dev_buffer {
  31         /** Total size of the buffer. */
  32         size_t size;
  33         /** Amount of data currently in the buffer. */
  34         size_t len;
  35         /** Offset where the data starts in the buffer. */
  36         size_t offset;
  37         /** Space for the data. */
  38         uint8_t data[];
  39 };
  40
  41 static struct dev_buffer *dev_buffer_new(size_t size)
  42 {
  43         struct dev_buffer *dbuf;
  44
  45         dbuf = g_malloc0(sizeof(struct dev_buffer) + size);
  46         dbuf->size = size;
  47         dbuf->len = 0;
  48         dbuf->offset = 0;
  49
  50         return dbuf;
  51 }
  52
  53 static void dev_buffer_destroy(struct dev_buffer *dbuf)
  54 {
  55         g_free(dbuf);
  56 }
  57
  58 static int dev_buffer_fill_serial(struct dev_buffer *dbuf,
  59                                   struct sr_dev_inst *sdi)
  60 {
  61         struct sr_serial_dev_inst *serial;
  62         int len;
  63
  64         serial = sdi->conn;
  65
  66         /* If we already have data, move it to the beginning of the buffer. */
  67         if (dbuf->len > 0 && dbuf->offset > 0)
  68                 memmove(dbuf->data, dbuf->data + dbuf->offset, dbuf->len);
  69
  70         dbuf->offset = 0;
  71
  72         len = dbuf->size - dbuf->len;
  73         len = serial_read_nonblocking(serial, dbuf->data + dbuf->len, len);
  74         if (len < 0) {
  75                 sr_err("Serial port read error: %d.", len);
  76                 return len;
  77         }
  78
  79         dbuf->len += len;
  80
  81         return SR_OK;
  82 }
  83
  84 static uint8_t *dev_buffer_packet_find(struct dev_buffer *dbuf,
  85                                 gboolean (*packet_valid)(const uint8_t *),
  86                                 size_t packet_size)
  87 {
  88         size_t offset;
  89
  90         while (dbuf->len >= packet_size) {
  91                 if (packet_valid(dbuf->data + dbuf->offset)) {
  92                         offset = dbuf->offset;
  93                         dbuf->offset += packet_size;
  94                         dbuf->len -= packet_size;
  95                         return dbuf->data + offset;
  96                 }
  97                 dbuf->offset++;
  98                 dbuf->len--;
  99         }
 100
 101         return NULL;
 102 }
 103
 104 struct dev_limit_counter {
 105         /** The current number of received samples/frames/etc. */
 106         uint64_t count;
 107         /** The limit (in number of samples/frames/etc.). */
 108         uint64_t limit;
 109 };
 110
 111 static void dev_limit_counter_start(struct dev_limit_counter *cnt)
 112 {
 113         cnt->count = 0;
 114 }
 115
 116 static void dev_limit_counter_inc(struct dev_limit_counter *cnt)
 117 {
 118         cnt->count++;
 119 }
 120
 121 static void dev_limit_counter_limit_set(struct dev_limit_counter *cnt,
 122                                         uint64_t limit)
 123 {
 124         cnt->limit = limit;
 125 }
 126
 127 static gboolean dev_limit_counter_limit_reached(struct dev_limit_counter *cnt)
 128 {
 129         if (cnt->limit && cnt->count >= cnt->limit) {
 130                 sr_info("Requested counter limit reached.");
 131                 return TRUE;
 132         }
 133
 134         return FALSE;
 135 }
 136
 137 struct dev_time_counter {
 138         /** The starting time of current sampling run. */
 139         int64_t starttime;
 140         /** The time limit (in milliseconds). */
 141         uint64_t limit;
 142 };
 143
 144 static void dev_time_counter_start(struct dev_time_counter *cnt)
 145 {
 146         cnt->starttime = g_get_monotonic_time();
 147 }
 148
 149 static void dev_time_limit_set(struct dev_time_counter *cnt, uint64_t limit)
 150 {
 151         cnt->limit = limit;
 152 }
 153
 154 static gboolean dev_time_limit_reached(struct dev_time_counter *cnt)
 155 {
 156         int64_t time;
 157
 158         if (cnt->limit) {
 159                 time = (g_get_monotonic_time() - cnt->starttime) / 1000;
 160                 if (time > (int64_t)cnt->limit) {
 161                         sr_info("Requested time limit reached.");
 162                         return TRUE;
 163                 }
 164         }
 165
 166         return FALSE;
 167 }
 168
 169 static void serial_conf_get(GSList *options, const char *def_serialcomm,
 170                             const char **conn, const char **serialcomm)
 171 {
 172         struct sr_config *src;
 173         GSList *l;
 174
 175         *conn = *serialcomm = NULL;
 176         for (l = options; l; l = l->next) {
 177                 src = l->data;
 178                 switch (src->key) {
 179                 case SR_CONF_CONN:
 180                         *conn = g_variant_get_string(src->data, NULL);
 181                         break;
 182                 case SR_CONF_SERIALCOMM:
 183                         *serialcomm = g_variant_get_string(src->data, NULL);
 184                         break;
 185                 }
 186         }
 187
 188         if (*serialcomm == NULL)
 189                 *serialcomm = def_serialcomm;
 190 }
 191
 192 static struct sr_serial_dev_inst *serial_dev_new(GSList *options,
 193                                                  const char *def_serialcomm)
 194
 195 {
 196         const char *conn, *serialcomm;
 197
 198         serial_conf_get(options, def_serialcomm, &conn, &serialcomm);
 199
 200         if (!conn)
 201                 return NULL;
 202
 203         return sr_serial_dev_inst_new(conn, serialcomm);
 204 }
 205
 206 static int serial_stream_check_buf(struct sr_serial_dev_inst *serial,
 207                                    uint8_t *buf, size_t buflen,
 208                                    size_t packet_size,
 209                                    packet_valid_callback is_valid,
 210                                    uint64_t timeout_ms, int baudrate)
 211 {
 212         size_t len, dropped;
 213         int ret;
 214
 215         if ((ret = serial_open(serial, SERIAL_RDWR)) != SR_OK)
 216                 return ret;
 217
 218         serial_flush(serial);
 219
 220         len = buflen;
 221         ret = serial_stream_detect(serial, buf, &len, packet_size,
 222                                    is_valid, timeout_ms, baudrate);
 223
 224         serial_close(serial);
 225
 226         if (ret != SR_OK)
 227                 return ret;
 228
 229         /*
 230          * If we dropped more than two packets worth of data, something is
 231          * wrong. We shouldn't quit however, since the dropped bytes might be
 232          * just zeroes at the beginning of the stream. Those can occur as a
 233          * combination of the nonstandard cable that ships with some devices
 234          * and the serial port or USB to serial adapter.
 235          */
 236         dropped = len - packet_size;
 237         if (dropped > 2 * packet_size)
 238                 sr_warn("Had to drop too much data.");
 239
 240         return SR_OK;
 241 }
 242
 243 static int serial_stream_check(struct sr_serial_dev_inst *serial,
 244                                size_t packet_size,
 245                                packet_valid_callback is_valid,
 246                                uint64_t timeout_ms, int baudrate)
 247 {
 248         uint8_t buf[128];
 249
 250         return serial_stream_check_buf(serial, buf, sizeof(buf), packet_size,
 251                                        is_valid, timeout_ms, baudrate);
 252 }
 253
 254 /*
 255  * Cyrustek ES51919 LCR chipset host protocol.
 256  *
 257  * Public official documentation does not contain the protocol
 258  * description, so this is all based on reverse engineering.
 259  *
 260  * Packet structure (17 bytes):
 261  *
 262  * 0x00: header1 ?? (0x00)
 263  * 0x01: header2 ?? (0x0d)
 264  *
 265  * 0x02: flags
 266  *         bit 0 = hold enabled
 267  *         bit 1 = reference shown (in delta mode)
 268  *         bit 2 = delta mode
 269  *         bit 3 = calibration mode
 270  *         bit 4 = sorting mode
 271  *         bit 5 = LCR mode
 272  *         bit 6 = auto mode
 273  *         bit 7 = parallel measurement (vs. serial)
 274  *
 275  * 0x03: config
 276  *         bit 0-4 = ??? (0x10)
 277  *         bit 5-7 = test frequency
 278  *                     0 = 100 Hz
 279  *                     1 = 120 Hz
 280  *                     2 = 1 kHz
 281  *                     3 = 10 kHz
 282  *                     4 = 100 kHz
 283  *                     5 = 0 Hz (DC)
 284  *
 285  * 0x04: tolerance (sorting mode)
 286  *         0 = not set
 287  *         3 = +-0.25%
 288  *         4 = +-0.5%
 289  *         5 = +-1%
 290  *         6 = +-2%
 291  *         7 = +-5%
 292  *         8 = +-10%
 293  *         9 = +-20%
 294  *        10 = -20+80%
 295  *
 296  * 0x05-0x09: primary measurement
 297  *   0x05: measured quantity
 298  *           1 = inductance
 299  *           2 = capacitance
 300  *           3 = resistance
 301  *           4 = DC resistance
 302  *   0x06: measurement MSB  (0x4e20 = 20000 = outside limits)
 303  *   0x07: measurement LSB
 304  *   0x08: measurement info
 305  *           bit 0-2 = decimal point multiplier (10^-val)
 306  *           bit 3-7 = unit
 307  *                       0 = no unit
 308  *                       1 = Ohm
 309  *                       2 = kOhm
 310  *                       3 = MOhm
 311  *                       5 = uH
 312  *                       6 = mH
 313  *                       7 = H
 314  *                       8 = kH
 315  *                       9 = pF
 316  *                       10 = nF
 317  *                       11 = uF
 318  *                       12 = mF
 319  *                       13 = %
 320  *                       14 = degree
 321  *   0x09: measurement status
 322  *           bit 0-3 = status
 323  *                       0 = normal (measurement shown)
 324  *                       1 = blank (nothing shown)
 325  *                       2 = lines ("----")
 326  *                       3 = outside limits ("OL")
 327  *                       7 = pass ("PASS")
 328  *                       8 = fail ("FAIL")
 329  *                       9 = open ("OPEn")
 330  *                      10 = shorted ("Srt")
 331  *           bit 4-6 = ??? (maybe part of same field with 0-3)
 332  *           bit 7   = ??? (some independent flag)
 333  *
 334  * 0x0a-0x0e: secondary measurement
 335  *   0x0a: measured quantity
 336  *           0 = none
 337  *           1 = dissipation factor
 338  *           2 = quality factor
 339  *           3 = parallel AC resistance / ESR
 340  *           4 = phase angle
 341  *   0x0b-0x0e: like primary measurement
 342  *
 343  * 0x0f: footer1 (0x0d) ?
 344  * 0x10: footer2 (0x0a) ?
 345  */
 346
 347 #define PACKET_SIZE 17
 348
 349 static const double frequencies[] = {
 350         100, 120, 1000, 10000, 100000, 0,
 351 };
 352
 353 enum { MODEL_NONE, MODEL_PAR, MODEL_SER, MODEL_AUTO, };
 354
 355 static const char *const models[] = {
 356         "NONE", "PARALLEL", "SERIES", "AUTO",
 357 };
 358
 359 struct dev_context {
 360         struct dev_limit_counter frame_count;
 361
 362         struct dev_time_counter time_count;
 363
 364         struct dev_buffer *buf;
 365
 366         /** The frequency of the test signal (index to frequencies[]). */
 367         unsigned int freq;
 368
 369         /** Equivalent circuit model (index to models[]). */
 370         unsigned int model;
 371 };
 372
 373 static const uint8_t *pkt_to_buf(const uint8_t *pkt, int is_secondary)
 374 {
 375         return is_secondary ? pkt + 10 : pkt + 5;
 376 }
 377
 378 static int parse_mq(const uint8_t *pkt, int is_secondary, int is_parallel)
 379 {
 380         const uint8_t *buf;
 381
 382         buf = pkt_to_buf(pkt, is_secondary);
 383
 384         switch (is_secondary << 8 | buf[0]) {
 385         case 0x001:
 386                 return is_parallel ?
 387                         SR_MQ_PARALLEL_INDUCTANCE : SR_MQ_SERIES_INDUCTANCE;
 388         case 0x002:
 389                 return is_parallel ?
 390                         SR_MQ_PARALLEL_CAPACITANCE : SR_MQ_SERIES_CAPACITANCE;
 391         case 0x003:
 392         case 0x103:
 393                 return is_parallel ?
 394                         SR_MQ_PARALLEL_RESISTANCE : SR_MQ_SERIES_RESISTANCE;
 395         case 0x004:
 396                 return SR_MQ_RESISTANCE;
 397         case 0x100:
 398                 return SR_MQ_DIFFERENCE;
 399         case 0x101:
 400                 return SR_MQ_DISSIPATION_FACTOR;
 401         case 0x102:
 402                 return SR_MQ_QUALITY_FACTOR;
 403         case 0x104:
 404                 return SR_MQ_PHASE_ANGLE;
 405         }
 406
 407         sr_err("Unknown quantity 0x%03x.", is_secondary << 8 | buf[0]);
 408
 409         return 0;
 410 }
 411
 412 static float parse_value(const uint8_t *buf, int *digits)
 413 {
 414         static const int exponents[] = {0, -1, -2, -3, -4, -5, -6, -7};
 415         int exponent;
 416         int16_t val;
 417
 418         exponent = exponents[buf[3] & 7];
 419         *digits = -exponent;
 420         val = (buf[1] << 8) | buf[2];
 421         return (float)val * powf(10, exponent);
 422 }
 423
 424 static void parse_measurement(const uint8_t *pkt, float *floatval,
 425                               struct sr_datafeed_analog *analog,
 426                               int is_secondary)
 427 {
 428         static const struct {
 429                 int unit;
 430                 int exponent;
 431         } units[] = {
 432                 { SR_UNIT_UNITLESS,   0 }, /* no unit */
 433                 { SR_UNIT_OHM,        0 }, /* Ohm */
 434                 { SR_UNIT_OHM,        3 }, /* kOhm */
 435                 { SR_UNIT_OHM,        6 }, /* MOhm */
 436                 { -1,                 0 }, /* ??? */
 437                 { SR_UNIT_HENRY,     -6 }, /* uH */
 438                 { SR_UNIT_HENRY,     -3 }, /* mH */
 439                 { SR_UNIT_HENRY,      0 }, /* H */
 440                 { SR_UNIT_HENRY,      3 }, /* kH */
 441                 { SR_UNIT_FARAD,    -12 }, /* pF */
 442                 { SR_UNIT_FARAD,     -9 }, /* nF */
 443                 { SR_UNIT_FARAD,     -6 }, /* uF */
 444                 { SR_UNIT_FARAD,     -3 }, /* mF */
 445                 { SR_UNIT_PERCENTAGE, 0 }, /* % */
 446                 { SR_UNIT_DEGREE,     0 }, /* degree */
 447         };
 448         const uint8_t *buf;
 449         int digits, exponent;
 450         int state;
 451
 452         buf = pkt_to_buf(pkt, is_secondary);
 453
 454         analog->meaning->mq = 0;
 455         analog->meaning->mqflags = 0;
 456
 457         state = buf[4] & 0xf;
 458
 459         if (state != 0 && state != 3)
 460                 return;
 461
 462         if (pkt[2] & 0x18) {
 463                 /* Calibration and Sorting modes not supported. */
 464                 return;
 465         }
 466
 467         if (!is_secondary) {
 468                 if (pkt[2] & 0x01)
 469                         analog->meaning->mqflags |= SR_MQFLAG_HOLD;
 470                 if (pkt[2] & 0x02)
 471                         analog->meaning->mqflags |= SR_MQFLAG_REFERENCE;
 472         } else {
 473                 if (pkt[2] & 0x04)
 474                         analog->meaning->mqflags |= SR_MQFLAG_RELATIVE;
 475         }
 476
 477         if ((analog->meaning->mq = parse_mq(pkt, is_secondary, pkt[2] & 0x80)) == 0)
 478                 return;
 479
 480         if ((buf[3] >> 3) >= ARRAY_SIZE(units)) {
 481                 sr_err("Unknown unit %u.", buf[3] >> 3);
 482                 analog->meaning->mq = 0;
 483                 return;
 484         }
 485
 486         analog->meaning->unit = units[buf[3] >> 3].unit;
 487
 488         exponent = units[buf[3] >> 3].exponent;
 489         *floatval = parse_value(buf, &digits);
 490         *floatval *= (state == 0) ? powf(10, exponent) : INFINITY;
 491         analog->encoding->digits = digits - exponent;
 492         analog->spec->spec_digits = digits - exponent;
 493 }
 494
 495 static unsigned int parse_freq(const uint8_t *pkt)
 496 {
 497         unsigned int freq;
 498
 499         freq = pkt[3] >> 5;
 500
 501         if (freq >= ARRAY_SIZE(frequencies)) {
 502                 sr_err("Unknown frequency %u.", freq);
 503                 freq = ARRAY_SIZE(frequencies) - 1;
 504         }
 505
 506         return freq;
 507 }
 508
 509 static unsigned int parse_model(const uint8_t *pkt)
 510 {
 511         if (pkt[2] & 0x40)
 512                 return MODEL_AUTO;
 513         else if (parse_mq(pkt, 0, 0) == SR_MQ_RESISTANCE)
 514                 return MODEL_NONE;
 515         else if (pkt[2] & 0x80)
 516                 return MODEL_PAR;
 517         else
 518                 return MODEL_SER;
 519 }
 520
 521 static gboolean packet_valid(const uint8_t *pkt)
 522 {
 523         /*
 524          * If the first two bytes of the packet are indeed a constant
 525          * header, they should be checked too. Since we don't know it
 526          * for sure, we'll just check the last two for now since they
 527          * seem to be constant just like in the other Cyrustek chipset
 528          * protocols.
 529          */
 530         if (pkt[15] == 0xd && pkt[16] == 0xa)
 531                 return TRUE;
 532
 533         return FALSE;
 534 }
 535
 536 static int send_freq_update(struct sr_dev_inst *sdi, unsigned int freq)
 537 {
 538         return sr_session_send_meta(sdi, SR_CONF_OUTPUT_FREQUENCY,
 539                                 g_variant_new_double(frequencies[freq]));
 540 }
 541
 542 static int send_model_update(struct sr_dev_inst *sdi, unsigned int model)
 543 {
 544         return sr_session_send_meta(sdi, SR_CONF_EQUIV_CIRCUIT_MODEL,
 545                                 g_variant_new_string(models[model]));
 546 }
 547
 548 static void handle_packet(struct sr_dev_inst *sdi, const uint8_t *pkt)
 549 {
 550         struct sr_datafeed_packet packet;
 551         struct sr_datafeed_analog analog;
 552         struct sr_analog_encoding encoding;
 553         struct sr_analog_meaning meaning;
 554         struct sr_analog_spec spec;
 555         struct dev_context *devc;
 556         unsigned int val;
 557         float floatval;
 558         gboolean frame;
 559         struct sr_channel *channel;
 560
 561         devc = sdi->priv;
 562
 563         val = parse_freq(pkt);
 564         if (val != devc->freq) {
 565                 if (send_freq_update(sdi, val) == SR_OK)
 566                         devc->freq = val;
 567                 else
 568                         return;
 569         }
 570
 571         val = parse_model(pkt);
 572         if (val != devc->model) {
 573                 if (send_model_update(sdi, val) == SR_OK)
 574                         devc->model = val;
 575                 else
 576                         return;
 577         }
 578
 579         frame = FALSE;
 580
 581         /* Note: digits/spec_digits will be overridden later. */
 582         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 583
 584         analog.num_samples = 1;
 585         analog.data = &floatval;
 586
 587         channel = sdi->channels->data;
 588         analog.meaning->channels = g_slist_append(NULL, channel);
 589
 590         parse_measurement(pkt, &floatval, &analog, 0);
 591         if (analog.meaning->mq != 0 && channel->enabled) {
 592                 if (!frame) {
 593                         packet.type = SR_DF_FRAME_BEGIN;
 594                         sr_session_send(sdi, &packet);
 595                         frame = TRUE;
 596                 }
 597
 598                 packet.type = SR_DF_ANALOG;
 599                 packet.payload = &analog;
 600
 601                 sr_session_send(sdi, &packet);
 602         }
 603
 604         g_slist_free(analog.meaning->channels);
 605
 606         channel = sdi->channels->next->data;
 607         analog.meaning->channels = g_slist_append(NULL, channel);
 608
 609         parse_measurement(pkt, &floatval, &analog, 1);
 610         if (analog.meaning->mq != 0 && channel->enabled) {
 611                 if (!frame) {
 612                         packet.type = SR_DF_FRAME_BEGIN;
 613                         sr_session_send(sdi, &packet);
 614                         frame = TRUE;
 615                 }
 616
 617                 packet.type = SR_DF_ANALOG;
 618                 packet.payload = &analog;
 619
 620                 sr_session_send(sdi, &packet);
 621         }
 622
 623         g_slist_free(analog.meaning->channels);
 624
 625         if (frame) {
 626                 packet.type = SR_DF_FRAME_END;
 627                 sr_session_send(sdi, &packet);
 628                 dev_limit_counter_inc(&devc->frame_count);
 629         }
 630 }
 631
 632 static int handle_new_data(struct sr_dev_inst *sdi)
 633 {
 634         struct dev_context *devc;
 635         uint8_t *pkt;
 636         int ret;
 637
 638         devc = sdi->priv;
 639
 640         ret = dev_buffer_fill_serial(devc->buf, sdi);
 641         if (ret < 0)
 642                 return ret;
 643
 644         while ((pkt = dev_buffer_packet_find(devc->buf, packet_valid,
 645                                              PACKET_SIZE)))
 646                 handle_packet(sdi, pkt);
 647
 648         return SR_OK;
 649 }
 650
 651 static int receive_data(int fd, int revents, void *cb_data)
 652 {
 653         struct sr_dev_inst *sdi;
 654         struct dev_context *devc;
 655
 656         (void)fd;
 657
 658         if (!(sdi = cb_data))
 659                 return TRUE;
 660
 661         if (!(devc = sdi->priv))
 662                 return TRUE;
 663
 664         if (revents == G_IO_IN) {
 665                 /* Serial data arrived. */
 666                 handle_new_data(sdi);
 667         }
 668
 669         if (dev_limit_counter_limit_reached(&devc->frame_count) ||
 670             dev_time_limit_reached(&devc->time_count))
 671                 sr_dev_acquisition_stop(sdi);
 672
 673         return TRUE;
 674 }
 675
 676 static const char *const channel_names[] = { "P1", "P2" };
 677
 678 static int setup_channels(struct sr_dev_inst *sdi)
 679 {
 680         unsigned int i;
 681
 682         for (i = 0; i < ARRAY_SIZE(channel_names); i++)
 683                 sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 684
 685         return SR_OK;
 686 }
 687
 688 SR_PRIV void es51919_serial_clean(void *priv)
 689 {
 690         struct dev_context *devc;
 691
 692         if (!(devc = priv))
 693                 return;
 694
 695         dev_buffer_destroy(devc->buf);
 696 }
 697
 698 SR_PRIV struct sr_dev_inst *es51919_serial_scan(GSList *options,
 699                                                 const char *vendor,
 700                                                 const char *model)
 701 {
 702         struct sr_serial_dev_inst *serial;
 703         struct sr_dev_inst *sdi;
 704         struct dev_context *devc;
 705         int ret;
 706
 707         serial = NULL;
 708         sdi = NULL;
 709         devc = NULL;
 710
 711         if (!(serial = serial_dev_new(options, "9600/8n1/rts=1/dtr=1")))
 712                 goto scan_cleanup;
 713
 714         ret = serial_stream_check(serial, PACKET_SIZE, packet_valid,
 715                                   3000, 9600);
 716         if (ret != SR_OK)
 717                 goto scan_cleanup;
 718
 719         sr_info("Found device on port %s.", serial->port);
 720
 721         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 722         sdi->status = SR_ST_INACTIVE;
 723         sdi->vendor = g_strdup(vendor);
 724         sdi->model = g_strdup(model);
 725         devc = g_malloc0(sizeof(struct dev_context));
 726         devc->buf = dev_buffer_new(PACKET_SIZE * 8);
 727         sdi->inst_type = SR_INST_SERIAL;
 728         sdi->conn = serial;
 729         sdi->priv = devc;
 730
 731         if (setup_channels(sdi) != SR_OK)
 732                 goto scan_cleanup;
 733
 734         return sdi;
 735
 736 scan_cleanup:
 737         es51919_serial_clean(devc);
 738         sr_dev_inst_free(sdi);
 739         sr_serial_dev_inst_free(serial);
 740
 741         return NULL;
 742 }
 743
 744 SR_PRIV int es51919_serial_config_get(uint32_t key, GVariant **data,
 745                                       const struct sr_dev_inst *sdi,
 746                                       const struct sr_channel_group *cg)
 747 {
 748         struct dev_context *devc;
 749
 750         (void)cg;
 751
 752         devc = sdi->priv;
 753
 754         switch (key) {
 755         case SR_CONF_OUTPUT_FREQUENCY:
 756                 *data = g_variant_new_double(frequencies[devc->freq]);
 757                 break;
 758         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 759                 *data = g_variant_new_string(models[devc->model]);
 760                 break;
 761         default:
 762                 return SR_ERR_NA;
 763         }
 764
 765         return SR_OK;
 766 }
 767
 768 SR_PRIV int es51919_serial_config_set(uint32_t key, GVariant *data,
 769                                       const struct sr_dev_inst *sdi,
 770                                       const struct sr_channel_group *cg)
 771 {
 772         struct dev_context *devc;
 773         uint64_t val;
 774
 775         (void)cg;
 776
 777         if (!(devc = sdi->priv))
 778                 return SR_ERR_BUG;
 779
 780         switch (key) {
 781         case SR_CONF_LIMIT_MSEC:
 782                 val = g_variant_get_uint64(data);
 783                 dev_time_limit_set(&devc->time_count, val);
 784                 sr_dbg("Setting time limit to %" PRIu64 ".", val);
 785                 break;
 786         case SR_CONF_LIMIT_FRAMES:
 787                 val = g_variant_get_uint64(data);
 788                 dev_limit_counter_limit_set(&devc->frame_count, val);
 789                 sr_dbg("Setting frame limit to %" PRIu64 ".", val);
 790                 break;
 791         default:
 792                 sr_spew("%s: Unsupported key %u", __func__, key);
 793                 return SR_ERR_NA;
 794         }
 795
 796         return SR_OK;
 797 }
 798
 799 static const uint32_t scanopts[] = {
 800         SR_CONF_CONN,
 801         SR_CONF_SERIALCOMM,
 802 };
 803
 804 static const uint32_t drvopts[] = {
 805         SR_CONF_LCRMETER,
 806 };
 807
 808 static const uint32_t devopts[] = {
 809         SR_CONF_CONTINUOUS,
 810         SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
 811         SR_CONF_LIMIT_MSEC | SR_CONF_SET,
 812         SR_CONF_OUTPUT_FREQUENCY | SR_CONF_GET | SR_CONF_LIST,
 813         SR_CONF_EQUIV_CIRCUIT_MODEL | SR_CONF_GET | SR_CONF_LIST,
 814 };
 815
 816 SR_PRIV int es51919_serial_config_list(uint32_t key, GVariant **data,
 817                                        const struct sr_dev_inst *sdi,
 818                                        const struct sr_channel_group *cg)
 819 {
 820         switch (key) {
 821         case SR_CONF_SCAN_OPTIONS:
 822         case SR_CONF_DEVICE_OPTIONS:
 823                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 824         case SR_CONF_OUTPUT_FREQUENCY:
 825                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_DOUBLE,
 826                         ARRAY_AND_SIZE(frequencies), sizeof(double));
 827                 break;
 828         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 829                 *data = g_variant_new_strv(ARRAY_AND_SIZE(models));
 830                 break;
 831         default:
 832                 return SR_ERR_NA;
 833         }
 834
 835         return SR_OK;
 836 }
 837
 838 SR_PRIV int es51919_serial_acquisition_start(const struct sr_dev_inst *sdi)
 839 {
 840         struct dev_context *devc;
 841         struct sr_serial_dev_inst *serial;
 842
 843         if (!(devc = sdi->priv))
 844                 return SR_ERR_BUG;
 845
 846         dev_limit_counter_start(&devc->frame_count);
 847         dev_time_counter_start(&devc->time_count);
 848
 849         std_session_send_df_header(sdi);
 850
 851         serial = sdi->conn;
 852         serial_source_add(sdi->session, serial, G_IO_IN, 50,
 853                           receive_data, (void *)sdi);
 854
 855         return SR_OK;
 856 }