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 <stdint.h>
  21 #include <string.h>
  22 #include <math.h>
  23 #include <glib.h>
  24 #include "libsigrok.h"
  25 #include "libsigrok-internal.h"
  26
  27 #define LOG_PREFIX "es51919"
  28
  29 struct dev_buffer {
  30         /** Total size of the buffer. */
  31         size_t size;
  32         /** Amount of data currently in the buffer. */
  33         size_t len;
  34         /** Offset where the data starts in the buffer. */
  35         size_t offset;
  36         /** Space for the data. */
  37         uint8_t data[];
  38 };
  39
  40 static struct dev_buffer *dev_buffer_new(size_t size)
  41 {
  42         struct dev_buffer *dbuf;
  43
  44         dbuf = g_malloc0(sizeof(struct dev_buffer) + size);
  45         dbuf->size = size;
  46         dbuf->len = 0;
  47         dbuf->offset = 0;
  48
  49         return dbuf;
  50 }
  51
  52 static void dev_buffer_destroy(struct dev_buffer *dbuf)
  53 {
  54         g_free(dbuf);
  55 }
  56
  57 static int dev_buffer_fill_serial(struct dev_buffer *dbuf,
  58                                   struct sr_dev_inst *sdi)
  59 {
  60         struct sr_serial_dev_inst *serial;
  61         int len;
  62
  63         serial = sdi->conn;
  64
  65         /* If we already have data, move it to the beginning of the buffer. */
  66         if (dbuf->len > 0 && dbuf->offset > 0)
  67                 memmove(dbuf->data, dbuf->data + dbuf->offset, dbuf->len);
  68
  69         dbuf->offset = 0;
  70
  71         len = dbuf->size - dbuf->len;
  72         len = serial_read_nonblocking(serial, dbuf->data + dbuf->len, len);
  73         if (len < 0) {
  74                 sr_err("Serial port read error: %d.", len);
  75                 return len;
  76         }
  77
  78         dbuf->len += len;
  79
  80         return SR_OK;
  81 }
  82
  83 static uint8_t *dev_buffer_packet_find(struct dev_buffer *dbuf,
  84                                 gboolean (*packet_valid)(const uint8_t *),
  85                                 size_t packet_size)
  86 {
  87         size_t offset;
  88
  89         while (dbuf->len >= packet_size) {
  90                 if (packet_valid(dbuf->data + dbuf->offset)) {
  91                         offset = dbuf->offset;
  92                         dbuf->offset += packet_size;
  93                         dbuf->len -= packet_size;
  94                         return dbuf->data + offset;
  95                 }
  96                 dbuf->offset++;
  97                 dbuf->len--;
  98         }
  99
 100         return NULL;
 101 }
 102
 103 struct dev_limit_counter {
 104         /** The current number of received samples/frames/etc. */
 105         uint64_t count;
 106         /** The limit (in number of samples/frames/etc.). */
 107         uint64_t limit;
 108 };
 109
 110 static void dev_limit_counter_start(struct dev_limit_counter *cnt)
 111 {
 112         cnt->count = 0;
 113 }
 114
 115 static void dev_limit_counter_inc(struct dev_limit_counter *cnt)
 116 {
 117         cnt->count++;
 118 }
 119
 120 static void dev_limit_counter_limit_set(struct dev_limit_counter *cnt,
 121                                         uint64_t limit)
 122 {
 123         cnt->limit = limit;
 124 }
 125
 126 static gboolean dev_limit_counter_limit_reached(struct dev_limit_counter *cnt)
 127 {
 128         if (cnt->limit && cnt->count >= cnt->limit) {
 129                 sr_info("Requested counter limit reached.");
 130                 return TRUE;
 131         }
 132
 133         return FALSE;
 134 }
 135
 136 struct dev_time_counter {
 137         /** The starting time of current sampling run. */
 138         int64_t starttime;
 139         /** The time limit (in milliseconds). */
 140         uint64_t limit;
 141 };
 142
 143 static void dev_time_counter_start(struct dev_time_counter *cnt)
 144 {
 145         cnt->starttime = g_get_monotonic_time();
 146 }
 147
 148 static void dev_time_limit_set(struct dev_time_counter *cnt, uint64_t limit)
 149 {
 150         cnt->limit = limit;
 151 }
 152
 153 static gboolean dev_time_limit_reached(struct dev_time_counter *cnt)
 154 {
 155         int64_t time;
 156
 157         if (cnt->limit) {
 158                 time = (g_get_monotonic_time() - cnt->starttime) / 1000;
 159                 if (time > (int64_t)cnt->limit) {
 160                         sr_info("Requested time limit reached.");
 161                         return TRUE;
 162                 }
 163         }
 164
 165         return FALSE;
 166 }
 167
 168 static void serial_conf_get(GSList *options, const char *def_serialcomm,
 169                             const char **conn, const char **serialcomm)
 170 {
 171         struct sr_config *src;
 172         GSList *l;
 173
 174         *conn = *serialcomm = NULL;
 175         for (l = options; l; l = l->next) {
 176                 src = l->data;
 177                 switch (src->key) {
 178                 case SR_CONF_CONN:
 179                         *conn = g_variant_get_string(src->data, NULL);
 180                         break;
 181                 case SR_CONF_SERIALCOMM:
 182                         *serialcomm = g_variant_get_string(src->data, NULL);
 183                         break;
 184                 }
 185         }
 186
 187         if (*serialcomm == NULL)
 188                 *serialcomm = def_serialcomm;
 189 }
 190
 191 static struct sr_serial_dev_inst *serial_dev_new(GSList *options,
 192                                                  const char *def_serialcomm)
 193
 194 {
 195         const char *conn, *serialcomm;
 196
 197         serial_conf_get(options, def_serialcomm, &conn, &serialcomm);
 198
 199         if (!conn)
 200                 return NULL;
 201
 202         return sr_serial_dev_inst_new(conn, serialcomm);
 203 }
 204
 205 static int serial_stream_check_buf(struct sr_serial_dev_inst *serial,
 206                                    uint8_t *buf, size_t buflen,
 207                                    size_t packet_size,
 208                                    packet_valid_callback is_valid,
 209                                    uint64_t timeout_ms, int baudrate)
 210 {
 211         size_t len, dropped;
 212         int ret;
 213
 214         if ((ret = serial_open(serial, SERIAL_RDWR)) != SR_OK)
 215                 return ret;
 216
 217         serial_flush(serial);
 218
 219         len = buflen;
 220         ret = serial_stream_detect(serial, buf, &len, packet_size,
 221                                    is_valid, timeout_ms, baudrate);
 222
 223         serial_close(serial);
 224
 225         if (ret != SR_OK)
 226                 return ret;
 227
 228         /*
 229          * If we dropped more than two packets worth of data, something is
 230          * wrong. We shouldn't quit however, since the dropped bytes might be
 231          * just zeroes at the beginning of the stream. Those can occur as a
 232          * combination of the nonstandard cable that ships with some devices
 233          * and the serial port or USB to serial adapter.
 234          */
 235         dropped = len - packet_size;
 236         if (dropped > 2 * packet_size)
 237                 sr_warn("Had to drop too much data.");
 238
 239         return SR_OK;
 240 }
 241
 242 static int serial_stream_check(struct sr_serial_dev_inst *serial,
 243                                size_t packet_size,
 244                                packet_valid_callback is_valid,
 245                                uint64_t timeout_ms, int baudrate)
 246 {
 247         uint8_t buf[128];
 248
 249         return serial_stream_check_buf(serial, buf, sizeof(buf), packet_size,
 250                                        is_valid, timeout_ms, baudrate);
 251 }
 252
 253 struct std_opt_desc {
 254         const uint32_t *scanopts;
 255         const int num_scanopts;
 256         const uint32_t *devopts;
 257         const int num_devopts;
 258 };
 259
 260 static int std_config_list(uint32_t key, GVariant **data,
 261                            const struct std_opt_desc *d)
 262 {
 263         switch (key) {
 264         case SR_CONF_SCAN_OPTIONS:
 265                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 266                         d->scanopts, d->num_scanopts, sizeof(uint32_t));
 267                 break;
 268         case SR_CONF_DEVICE_OPTIONS:
 269                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 270                         d->devopts, d->num_devopts, sizeof(uint32_t));
 271                 break;
 272         default:
 273                 return SR_ERR_NA;
 274         }
 275
 276         return SR_OK;
 277 }
 278
 279 static int send_config_update(struct sr_dev_inst *sdi, struct sr_config *cfg)
 280 {
 281         struct sr_datafeed_packet packet;
 282         struct sr_datafeed_meta meta;
 283
 284         memset(&meta, 0, sizeof(meta));
 285
 286         packet.type = SR_DF_META;
 287         packet.payload = &meta;
 288
 289         meta.config = g_slist_append(meta.config, cfg);
 290
 291         return sr_session_send(sdi, &packet);
 292 }
 293
 294 static int send_config_update_key(struct sr_dev_inst *sdi, uint32_t key,
 295                                   GVariant *var)
 296 {
 297         struct sr_config *cfg;
 298         int ret;
 299
 300         cfg = sr_config_new(key, var);
 301         if (!cfg)
 302                 return SR_ERR;
 303
 304         ret = send_config_update(sdi, cfg);
 305         sr_config_free(cfg);
 306
 307         return ret;
 308
 309 }
 310
 311 /*
 312  * Cyrustek ES51919 LCR chipset host protocol.
 313  *
 314  * Public official documentation does not contain the protocol
 315  * description, so this is all based on reverse engineering.
 316  *
 317  * Packet structure (17 bytes):
 318  *
 319  * 0x00: header1 ?? (0x00)
 320  * 0x01: header2 ?? (0x0d)
 321  *
 322  * 0x02: flags
 323  *         bit 0 = hold enabled
 324  *         bit 1 = reference shown (in delta mode)
 325  *         bit 2 = delta mode
 326  *         bit 3 = calibration mode
 327  *         bit 4 = sorting mode
 328  *         bit 5 = LCR mode
 329  *         bit 6 = auto mode
 330  *         bit 7 = parallel measurement (vs. serial)
 331  *
 332  * 0x03: config
 333  *         bit 0-4 = ??? (0x10)
 334  *         bit 5-7 = test frequency
 335  *                     0 = 100 Hz
 336  *                     1 = 120 Hz
 337  *                     2 = 1 kHz
 338  *                     3 = 10 kHz
 339  *                     4 = 100 kHz
 340  *                     5 = 0 Hz (DC)
 341  *
 342  * 0x04: tolerance (sorting mode)
 343  *         0 = not set
 344  *         3 = +-0.25%
 345  *         4 = +-0.5%
 346  *         5 = +-1%
 347  *         6 = +-2%
 348  *         7 = +-5%
 349  *         8 = +-10%
 350  *         9 = +-20%
 351  *        10 = -20+80%
 352  *
 353  * 0x05-0x09: primary measurement
 354  *   0x05: measured quantity
 355  *           1 = inductance
 356  *           2 = capacitance
 357  *           3 = resistance
 358  *           4 = DC resistance
 359  *   0x06: measurement MSB  (0x4e20 = 20000 = outside limits)
 360  *   0x07: measurement LSB
 361  *   0x08: measurement info
 362  *           bit 0-2 = decimal point multiplier (10^-val)
 363  *           bit 3-7 = unit
 364  *                       0 = no unit
 365  *                       1 = Ohm
 366  *                       2 = kOhm
 367  *                       3 = MOhm
 368  *                       5 = uH
 369  *                       6 = mH
 370  *                       7 = H
 371  *                       8 = kH
 372  *                       9 = pF
 373  *                       10 = nF
 374  *                       11 = uF
 375  *                       12 = mF
 376  *                       13 = %
 377  *                       14 = degree
 378  *   0x09: measurement status
 379  *           bit 0-3 = status
 380  *                       0 = normal (measurement shown)
 381  *                       1 = blank (nothing shown)
 382  *                       2 = lines ("----")
 383  *                       3 = outside limits ("OL")
 384  *                       7 = pass ("PASS")
 385  *                       8 = fail ("FAIL")
 386  *                       9 = open ("OPEn")
 387  *                      10 = shorted ("Srt")
 388  *           bit 4-6 = ??? (maybe part of same field with 0-3)
 389  *           bit 7   = ??? (some independent flag)
 390  *
 391  * 0x0a-0x0e: secondary measurement
 392  *   0x0a: measured quantity
 393  *           0 = none
 394  *           1 = dissipation factor
 395  *           2 = quality factor
 396  *           3 = parallel AC resistance / ESR
 397  *           4 = phase angle
 398  *   0x0b-0x0e: like primary measurement
 399  *
 400  * 0x0f: footer1 (0x0d) ?
 401  * 0x10: footer2 (0x0a) ?
 402  */
 403
 404 #define PACKET_SIZE 17
 405
 406 static const uint64_t frequencies[] = {
 407         100, 120, 1000, 10000, 100000, 0,
 408 };
 409
 410 enum { QUANT_AUTO = 5, };
 411
 412 static const char *const quantities1[] = {
 413         "NONE", "INDUCTANCE", "CAPACITANCE", "RESISTANCE", "RESISTANCE", "AUTO",
 414 };
 415
 416 static const char *const list_quantities1[] = {
 417         "NONE", "INDUCTANCE", "CAPACITANCE", "RESISTANCE", "AUTO",
 418 };
 419
 420 static const char *const quantities2[] = {
 421         "NONE", "DISSIPATION", "QUALITY", "RESISTANCE", "ANGLE", "AUTO",
 422 };
 423
 424 enum { MODEL_NONE, MODEL_PAR, MODEL_SER, MODEL_AUTO, };
 425
 426 static const char *const models[] = {
 427         "NONE", "PARALLEL", "SERIES", "AUTO",
 428 };
 429
 430 /** Private, per-device-instance driver context. */
 431 struct dev_context {
 432         /** Opaque pointer passed in by the frontend. */
 433         void *cb_data;
 434
 435         /** The number of frames. */
 436         struct dev_limit_counter frame_count;
 437
 438         /** The time limit counter. */
 439         struct dev_time_counter time_count;
 440
 441         /** Data buffer. */
 442         struct dev_buffer *buf;
 443
 444         /** The frequency of the test signal (index to frequencies[]). */
 445         unsigned int freq;
 446
 447         /** Measured primary quantity (index to quantities1[]). */
 448         unsigned int quant1;
 449
 450         /** Measured secondary quantity (index to quantities2[]). */
 451         unsigned int quant2;
 452
 453         /** Equivalent circuit model (index to models[]). */
 454         unsigned int model;
 455 };
 456
 457 static const uint8_t *pkt_to_buf(const uint8_t *pkt, int is_secondary)
 458 {
 459         return is_secondary ? pkt + 10 : pkt + 5;
 460 }
 461
 462 static int parse_mq(const uint8_t *pkt, int is_secondary, int is_parallel)
 463 {
 464         const uint8_t *buf;
 465
 466         buf = pkt_to_buf(pkt, is_secondary);
 467
 468         switch (is_secondary << 8 | buf[0]) {
 469         case 0x001:
 470                 return is_parallel ?
 471                         SR_MQ_PARALLEL_INDUCTANCE : SR_MQ_SERIES_INDUCTANCE;
 472         case 0x002:
 473                 return is_parallel ?
 474                         SR_MQ_PARALLEL_CAPACITANCE : SR_MQ_SERIES_CAPACITANCE;
 475         case 0x003:
 476         case 0x103:
 477                 return is_parallel ?
 478                         SR_MQ_PARALLEL_RESISTANCE : SR_MQ_SERIES_RESISTANCE;
 479         case 0x004:
 480                 return SR_MQ_RESISTANCE;
 481         case 0x100:
 482                 return SR_MQ_DIFFERENCE;
 483         case 0x101:
 484                 return SR_MQ_DISSIPATION_FACTOR;
 485         case 0x102:
 486                 return SR_MQ_QUALITY_FACTOR;
 487         case 0x104:
 488                 return SR_MQ_PHASE_ANGLE;
 489         }
 490
 491         sr_err("Unknown quantity 0x%03x.", is_secondary << 8 | buf[0]);
 492
 493         return -1;
 494 }
 495
 496 static float parse_value(const uint8_t *buf)
 497 {
 498         static const float decimals[] = {
 499                 1, 1e-1, 1e-2, 1e-3, 1e-4, 1e-5, 1e-6, 1e-7
 500         };
 501         int16_t val;
 502
 503         val = (buf[1] << 8) | buf[2];
 504         return (float)val * decimals[buf[3] & 7];
 505 }
 506
 507 static void parse_measurement(const uint8_t *pkt, float *floatval,
 508                               struct sr_datafeed_analog *analog,
 509                               int is_secondary)
 510 {
 511         static const struct {
 512                 int unit;
 513                 float mult;
 514         } units[] = {
 515                 { SR_UNIT_UNITLESS, 1 },        /* no unit */
 516                 { SR_UNIT_OHM, 1 },             /* Ohm     */
 517                 { SR_UNIT_OHM, 1e3 },           /* kOhm    */
 518                 { SR_UNIT_OHM, 1e6 },           /* MOhm    */
 519                 { -1, 0 },                      /* ???     */
 520                 { SR_UNIT_HENRY, 1e-6 },        /* uH      */
 521                 { SR_UNIT_HENRY, 1e-3 },        /* mH      */
 522                 { SR_UNIT_HENRY, 1 },           /* H       */
 523                 { SR_UNIT_HENRY, 1e3 },         /* kH      */
 524                 { SR_UNIT_FARAD, 1e-12 },       /* pF      */
 525                 { SR_UNIT_FARAD, 1e-9 },        /* nF      */
 526                 { SR_UNIT_FARAD, 1e-6 },        /* uF      */
 527                 { SR_UNIT_FARAD, 1e-3 },        /* mF      */
 528                 { SR_UNIT_PERCENTAGE, 1 },      /* %       */
 529                 { SR_UNIT_DEGREE, 1 }           /* degree  */
 530         };
 531         const uint8_t *buf;
 532         int state;
 533
 534         buf = pkt_to_buf(pkt, is_secondary);
 535
 536         analog->mq = -1;
 537         analog->mqflags = 0;
 538
 539         state = buf[4] & 0xf;
 540
 541         if (state != 0 && state != 3)
 542                 return;
 543
 544         if (pkt[2] & 0x18) {
 545                 /* Calibration and Sorting modes not supported. */
 546                 return;
 547         }
 548
 549         if (!is_secondary) {
 550                 if (pkt[2] & 0x01)
 551                         analog->mqflags |= SR_MQFLAG_HOLD;
 552                 if (pkt[2] & 0x02)
 553                         analog->mqflags |= SR_MQFLAG_REFERENCE;
 554         } else {
 555                 if (pkt[2] & 0x04)
 556                         analog->mqflags |= SR_MQFLAG_RELATIVE;
 557         }
 558
 559         if ((analog->mq = parse_mq(pkt, is_secondary, pkt[2] & 0x80)) < 0)
 560                 return;
 561
 562         if ((buf[3] >> 3) >= ARRAY_SIZE(units)) {
 563                 sr_err("Unknown unit %u.", buf[3] >> 3);
 564                 analog->mq = -1;
 565                 return;
 566         }
 567
 568         analog->unit = units[buf[3] >> 3].unit;
 569
 570         *floatval = parse_value(buf);
 571         *floatval *= (state == 0) ? units[buf[3] >> 3].mult : INFINITY;
 572 }
 573
 574 static unsigned int parse_freq(const uint8_t *pkt)
 575 {
 576         unsigned int freq;
 577
 578         freq = pkt[3] >> 5;
 579
 580         if (freq >= ARRAY_SIZE(frequencies)) {
 581                 sr_err("Unknown frequency %u.", freq);
 582                 freq = ARRAY_SIZE(frequencies) - 1;
 583         }
 584
 585         return freq;
 586 }
 587
 588 static unsigned int parse_quant(const uint8_t *pkt, int is_secondary)
 589 {
 590         const uint8_t *buf;
 591
 592         if (pkt[2] & 0x20)
 593                 return QUANT_AUTO;
 594
 595         buf = pkt_to_buf(pkt, is_secondary);
 596
 597         return buf[0];
 598 }
 599
 600 static unsigned int parse_model(const uint8_t *pkt)
 601 {
 602         if (pkt[2] & 0x40)
 603                 return MODEL_AUTO;
 604         else if (parse_mq(pkt, 0, 0) == SR_MQ_RESISTANCE)
 605                 return MODEL_NONE;
 606         else if (pkt[2] & 0x80)
 607                 return MODEL_PAR;
 608         else
 609                 return MODEL_SER;
 610
 611 }
 612
 613 static gboolean packet_valid(const uint8_t *pkt)
 614 {
 615         /*
 616          * If the first two bytes of the packet are indeed a constant
 617          * header, they should be checked too. Since we don't know it
 618          * for sure, we'll just check the last two for now since they
 619          * seem to be constant just like in the other Cyrustek chipset
 620          * protocols.
 621          */
 622         if (pkt[15] == 0xd && pkt[16] == 0xa)
 623                 return TRUE;
 624
 625         return FALSE;
 626 }
 627
 628 static int do_config_update(struct sr_dev_inst *sdi, uint32_t key,
 629                             GVariant *var)
 630 {
 631         struct dev_context *devc;
 632
 633         devc = sdi->priv;
 634
 635         return send_config_update_key(devc->cb_data, key, var);
 636 }
 637
 638 static int send_freq_update(struct sr_dev_inst *sdi, unsigned int freq)
 639 {
 640         return do_config_update(sdi, SR_CONF_OUTPUT_FREQUENCY,
 641                                 g_variant_new_uint64(frequencies[freq]));
 642 }
 643
 644 static int send_quant1_update(struct sr_dev_inst *sdi, unsigned int quant)
 645 {
 646         return do_config_update(sdi, SR_CONF_MEASURED_QUANTITY,
 647                                 g_variant_new_string(quantities1[quant]));
 648 }
 649
 650 static int send_quant2_update(struct sr_dev_inst *sdi, unsigned int quant)
 651 {
 652         return do_config_update(sdi, SR_CONF_MEASURED_2ND_QUANTITY,
 653                                 g_variant_new_string(quantities2[quant]));
 654 }
 655
 656 static int send_model_update(struct sr_dev_inst *sdi, unsigned int model)
 657 {
 658         return do_config_update(sdi, SR_CONF_EQUIV_CIRCUIT_MODEL,
 659                                 g_variant_new_string(models[model]));
 660 }
 661
 662 static void handle_packet(struct sr_dev_inst *sdi, const uint8_t *pkt)
 663 {
 664         struct sr_datafeed_packet packet;
 665         struct sr_datafeed_analog analog;
 666         struct dev_context *devc;
 667         unsigned int val;
 668         float floatval;
 669         gboolean frame;
 670
 671         devc = sdi->priv;
 672
 673         val = parse_freq(pkt);
 674         if (val != devc->freq) {
 675                 if (send_freq_update(sdi, val) == SR_OK)
 676                         devc->freq = val;
 677                 else
 678                         return;
 679         }
 680
 681         val = parse_quant(pkt, 0);
 682         if (val != devc->quant1) {
 683                 if (send_quant1_update(sdi, val) == SR_OK)
 684                         devc->quant1 = val;
 685                 else
 686                         return;
 687         }
 688
 689         val = parse_quant(pkt, 1);
 690         if (val != devc->quant2) {
 691                 if (send_quant2_update(sdi, val) == SR_OK)
 692                         devc->quant2 = val;
 693                 else
 694                         return;
 695         }
 696
 697         val = parse_model(pkt);
 698         if (val != devc->model) {
 699                 if (send_model_update(sdi, val) == SR_OK)
 700                         devc->model = val;
 701                 else
 702                         return;
 703         }
 704
 705         frame = FALSE;
 706
 707         memset(&analog, 0, sizeof(analog));
 708
 709         analog.num_samples = 1;
 710         analog.data = &floatval;
 711
 712         analog.channels = g_slist_append(NULL, sdi->channels->data);
 713
 714         parse_measurement(pkt, &floatval, &analog, 0);
 715         if (analog.mq >= 0) {
 716                 if (!frame) {
 717                         packet.type = SR_DF_FRAME_BEGIN;
 718                         sr_session_send(devc->cb_data, &packet);
 719                         frame = TRUE;
 720                 }
 721
 722                 packet.type = SR_DF_ANALOG;
 723                 packet.payload = &analog;
 724
 725                 sr_session_send(devc->cb_data, &packet);
 726         }
 727
 728         analog.channels = g_slist_append(NULL, sdi->channels->next->data);
 729
 730         parse_measurement(pkt, &floatval, &analog, 1);
 731         if (analog.mq >= 0) {
 732                 if (!frame) {
 733                         packet.type = SR_DF_FRAME_BEGIN;
 734                         sr_session_send(devc->cb_data, &packet);
 735                         frame = TRUE;
 736                 }
 737
 738                 packet.type = SR_DF_ANALOG;
 739                 packet.payload = &analog;
 740
 741                 sr_session_send(devc->cb_data, &packet);
 742         }
 743
 744         if (frame) {
 745                 packet.type = SR_DF_FRAME_END;
 746                 sr_session_send(devc->cb_data, &packet);
 747                 dev_limit_counter_inc(&devc->frame_count);
 748         }
 749 }
 750
 751 static int handle_new_data(struct sr_dev_inst *sdi)
 752 {
 753         struct dev_context *devc;
 754         uint8_t *pkt;
 755         int ret;
 756
 757         devc = sdi->priv;
 758
 759         ret = dev_buffer_fill_serial(devc->buf, sdi);
 760         if (ret < 0)
 761                 return ret;
 762
 763         while ((pkt = dev_buffer_packet_find(devc->buf, packet_valid,
 764                                              PACKET_SIZE)))
 765                 handle_packet(sdi, pkt);
 766
 767         return SR_OK;
 768 }
 769
 770 static int receive_data(int fd, int revents, void *cb_data)
 771 {
 772         struct sr_dev_inst *sdi;
 773         struct dev_context *devc;
 774
 775         (void)fd;
 776
 777         if (!(sdi = cb_data))
 778                 return TRUE;
 779
 780         if (!(devc = sdi->priv))
 781                 return TRUE;
 782
 783         if (revents == G_IO_IN) {
 784                 /* Serial data arrived. */
 785                 handle_new_data(sdi);
 786         }
 787
 788         if (dev_limit_counter_limit_reached(&devc->frame_count) ||
 789             dev_time_limit_reached(&devc->time_count))
 790                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 791
 792         return TRUE;
 793 }
 794
 795 static const char *const channel_names[] = { "P1", "P2" };
 796
 797 static int setup_channels(struct sr_dev_inst *sdi)
 798 {
 799         unsigned int i;
 800         int ret;
 801
 802         ret = SR_ERR_BUG;
 803
 804         for (i = 0; i < ARRAY_SIZE(channel_names); i++)
 805                 sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 806
 807         return ret;
 808 }
 809
 810 SR_PRIV void es51919_serial_clean(void *priv)
 811 {
 812         struct dev_context *devc;
 813
 814         if (!(devc = priv))
 815                 return;
 816
 817         dev_buffer_destroy(devc->buf);
 818         g_free(devc);
 819 }
 820
 821 SR_PRIV struct sr_dev_inst *es51919_serial_scan(GSList *options,
 822                                                 const char *vendor,
 823                                                 const char *model)
 824 {
 825         struct sr_serial_dev_inst *serial;
 826         struct sr_dev_inst *sdi;
 827         struct dev_context *devc;
 828         int ret;
 829
 830         serial = NULL;
 831         sdi = NULL;
 832         devc = NULL;
 833
 834         if (!(serial = serial_dev_new(options, "9600/8n1/rts=1/dtr=1")))
 835                 goto scan_cleanup;
 836
 837         ret = serial_stream_check(serial, PACKET_SIZE, packet_valid,
 838                                   3000, 9600);
 839         if (ret != SR_OK)
 840                 goto scan_cleanup;
 841
 842         sr_info("Found device on port %s.", serial->port);
 843
 844         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 845         sdi->status = SR_ST_INACTIVE;
 846         sdi->vendor = g_strdup(vendor);
 847         sdi->model = g_strdup(model);
 848         devc = g_malloc0(sizeof(struct dev_context));
 849         devc->buf = dev_buffer_new(PACKET_SIZE * 8);
 850         sdi->inst_type = SR_INST_SERIAL;
 851         sdi->conn = serial;
 852         sdi->priv = devc;
 853
 854         if (setup_channels(sdi) != SR_OK)
 855                 goto scan_cleanup;
 856
 857         return sdi;
 858
 859 scan_cleanup:
 860         es51919_serial_clean(devc);
 861         if (sdi)
 862                 sr_dev_inst_free(sdi);
 863         if (serial)
 864                 sr_serial_dev_inst_free(serial);
 865
 866         return NULL;
 867 }
 868
 869 SR_PRIV int es51919_serial_config_get(uint32_t key, GVariant **data,
 870                                       const struct sr_dev_inst *sdi,
 871                                       const struct sr_channel_group *cg)
 872 {
 873         struct dev_context *devc;
 874
 875         (void)cg;
 876
 877         if (!(devc = sdi->priv))
 878                 return SR_ERR_BUG;
 879
 880         switch (key) {
 881         case SR_CONF_OUTPUT_FREQUENCY:
 882                 *data = g_variant_new_uint64(frequencies[devc->freq]);
 883                 break;
 884         case SR_CONF_MEASURED_QUANTITY:
 885                 *data = g_variant_new_string(quantities1[devc->quant1]);
 886                 break;
 887         case SR_CONF_MEASURED_2ND_QUANTITY:
 888                 *data = g_variant_new_string(quantities2[devc->quant2]);
 889                 break;
 890         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 891                 *data = g_variant_new_string(models[devc->model]);
 892                 break;
 893         default:
 894                 sr_spew("%s: Unsupported key %u", __func__, key);
 895                 return SR_ERR_NA;
 896         }
 897
 898         return SR_OK;
 899 }
 900
 901 SR_PRIV int es51919_serial_config_set(uint32_t key, GVariant *data,
 902                                       const struct sr_dev_inst *sdi,
 903                                       const struct sr_channel_group *cg)
 904 {
 905         struct dev_context *devc;
 906         uint64_t val;
 907
 908         (void)cg;
 909
 910         if (!(devc = sdi->priv))
 911                 return SR_ERR_BUG;
 912
 913         switch (key) {
 914         case SR_CONF_LIMIT_MSEC:
 915                 val = g_variant_get_uint64(data);
 916                 dev_time_limit_set(&devc->time_count, val);
 917                 sr_dbg("Setting time limit to %" PRIu64 ".", val);
 918                 break;
 919         case SR_CONF_LIMIT_FRAMES:
 920                 val = g_variant_get_uint64(data);
 921                 dev_limit_counter_limit_set(&devc->frame_count, val);
 922                 sr_dbg("Setting frame limit to %" PRIu64 ".", val);
 923                 break;
 924         default:
 925                 sr_spew("%s: Unsupported key %u", __func__, key);
 926                 return SR_ERR_NA;
 927         }
 928
 929         return SR_OK;
 930 }
 931
 932 static const uint32_t scanopts[] = {
 933         SR_CONF_CONN,
 934         SR_CONF_SERIALCOMM,
 935 };
 936
 937 static const uint32_t devopts[] = {
 938         SR_CONF_LCRMETER,
 939         SR_CONF_CONTINUOUS,
 940         SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
 941         SR_CONF_LIMIT_MSEC | SR_CONF_SET,
 942         SR_CONF_OUTPUT_FREQUENCY | SR_CONF_GET | SR_CONF_LIST,
 943         SR_CONF_MEASURED_QUANTITY | SR_CONF_GET | SR_CONF_LIST,
 944         SR_CONF_MEASURED_2ND_QUANTITY | SR_CONF_GET | SR_CONF_LIST,
 945         SR_CONF_EQUIV_CIRCUIT_MODEL | SR_CONF_GET | SR_CONF_LIST,
 946 };
 947
 948 static const struct std_opt_desc opts = {
 949         scanopts, ARRAY_SIZE(scanopts),
 950         devopts, ARRAY_SIZE(devopts),
 951 };
 952
 953 SR_PRIV int es51919_serial_config_list(uint32_t key, GVariant **data,
 954                                        const struct sr_dev_inst *sdi,
 955                                        const struct sr_channel_group *cg)
 956 {
 957         (void)sdi;
 958         (void)cg;
 959
 960         if (std_config_list(key, data, &opts) == SR_OK)
 961                 return SR_OK;
 962
 963         switch (key) {
 964         case SR_CONF_OUTPUT_FREQUENCY:
 965                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 966                         frequencies, ARRAY_SIZE(frequencies), sizeof(uint64_t));
 967                 break;
 968         case SR_CONF_MEASURED_QUANTITY:
 969                 *data = g_variant_new_strv(list_quantities1,
 970                                            ARRAY_SIZE(list_quantities1));
 971                 break;
 972         case SR_CONF_MEASURED_2ND_QUANTITY:
 973                 *data = g_variant_new_strv(quantities2,
 974                                            ARRAY_SIZE(quantities2));
 975                 break;
 976         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 977                 *data = g_variant_new_strv(models, ARRAY_SIZE(models));
 978                 break;
 979         default:
 980                 sr_spew("%s: Unsupported key %u", __func__, key);
 981                 return SR_ERR_NA;
 982         }
 983
 984         return SR_OK;
 985 }
 986
 987 SR_PRIV int es51919_serial_acquisition_start(const struct sr_dev_inst *sdi,
 988                                              void *cb_data)
 989 {
 990         struct dev_context *devc;
 991         struct sr_serial_dev_inst *serial;
 992
 993         if (sdi->status != SR_ST_ACTIVE)
 994                 return SR_ERR_DEV_CLOSED;
 995
 996         if (!(devc = sdi->priv))
 997                 return SR_ERR_BUG;
 998
 999         devc->cb_data = cb_data;
1000
1001         dev_limit_counter_start(&devc->frame_count);
1002         dev_time_counter_start(&devc->time_count);
1003
1004         /* Send header packet to the session bus. */
1005         std_session_send_df_header(cb_data, LOG_PREFIX);
1006
1007         /* Poll every 50ms, or whenever some data comes in. */
1008         serial = sdi->conn;
1009         serial_source_add(sdi->session, serial, G_IO_IN, 50,
1010                           receive_data, (void *)sdi);
1011
1012         return SR_OK;
1013 }
1014
1015 SR_PRIV int es51919_serial_acquisition_stop(struct sr_dev_inst *sdi,
1016                                             void *cb_data)
1017 {
1018         return std_serial_dev_acquisition_stop(sdi, cb_data,
1019                         std_serial_dev_close, sdi->conn, LOG_PREFIX);
1020 }