hardware/fluke-dmm/fluke.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 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 <stdlib.h>
  21 #include <math.h>
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <glib.h>
  25 #include "libsigrok.h"
  26 #include "libsigrok-internal.h"
  27 #include "fluke-dmm.h"
  28
  29 static struct sr_datafeed_analog *handle_qm_18x(const struct sr_dev_inst *sdi,
  30                 char **tokens)
  31 {
  32         struct sr_datafeed_analog *analog;
  33         float fvalue;
  34         char *e, *u;
  35         gboolean is_oor;
  36
  37         if (strcmp(tokens[0], "QM") || !tokens[1])
  38                 return NULL;
  39
  40         if ((e = strstr(tokens[1], "Out of range"))) {
  41                 is_oor = TRUE;
  42                 fvalue = -1;
  43         } else {
  44                 is_oor = FALSE;
  45                 fvalue = strtof(tokens[1], &e);
  46                 if (fvalue == 0.0 && e == tokens[1]) {
  47                         /* Happens all the time, when switching modes. */
  48                         sr_dbg("Invalid float.");
  49                         return NULL;
  50                 }
  51         }
  52         while(*e && *e == ' ')
  53                 e++;
  54
  55         if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog))))
  56                 return NULL;
  57         if (!(analog->data = g_try_malloc(sizeof(float))))
  58                 return NULL;
  59         analog->probes = sdi->probes;
  60         analog->num_samples = 1;
  61         if (is_oor)
  62                 *analog->data = NAN;
  63         else
  64                 *analog->data = fvalue;
  65         analog->mq = -1;
  66
  67         if ((u = strstr(e, "V DC")) || (u = strstr(e, "V AC"))) {
  68                 analog->mq = SR_MQ_VOLTAGE;
  69                 analog->unit = SR_UNIT_VOLT;
  70                 if (!is_oor && e[0] == 'm')
  71                         *analog->data /= 1000;
  72                 /* This catches "V AC", "V DC" and "V AC+DC". */
  73                 if (strstr(u, "AC"))
  74                         analog->mqflags |= SR_MQFLAG_AC | SR_MQFLAG_RMS;
  75                 if (strstr(u, "DC"))
  76                         analog->mqflags |= SR_MQFLAG_DC;
  77         } else if ((u = strstr(e, "dBV")) || (u = strstr(e, "dBm"))) {
  78                 analog->mq = SR_MQ_VOLTAGE;
  79                 if (u[2] == 'm')
  80                         analog->unit = SR_UNIT_DECIBEL_MW;
  81                 else
  82                         analog->unit = SR_UNIT_DECIBEL_VOLT;
  83                 analog->mqflags |= SR_MQFLAG_AC | SR_MQFLAG_RMS;
  84         } else if ((u = strstr(e, "Ohms"))) {
  85                 analog->mq = SR_MQ_RESISTANCE;
  86                 analog->unit = SR_UNIT_OHM;
  87                 if (is_oor)
  88                         *analog->data = INFINITY;
  89                 else if (e[0] == 'k')
  90                         *analog->data *= 1000;
  91                 else if (e[0] == 'M')
  92                         *analog->data *= 1000000;
  93         } else if (!strcmp(e, "nS")) {
  94                 analog->mq = SR_MQ_CONDUCTANCE;
  95                 analog->unit = SR_UNIT_SIEMENS;
  96                 *analog->data /= 1e+9;
  97         } else if ((u = strstr(e, "Farads"))) {
  98                 analog->mq = SR_MQ_CAPACITANCE;
  99                 analog->unit = SR_UNIT_FARAD;
 100                 if (!is_oor) {
 101                         if (e[0] == 'm')
 102                                 *analog->data /= 1e+3;
 103                         else if (e[0] == 'u')
 104                                 *analog->data /= 1e+6;
 105                         else if (e[0] == 'n')
 106                                 *analog->data /= 1e+9;
 107                 }
 108         } else if ((u = strstr(e, "Deg C")) || (u = strstr(e, "Deg F"))) {
 109                 analog->mq = SR_MQ_TEMPERATURE;
 110                 if (u[4] == 'C')
 111                         analog->unit = SR_UNIT_CELSIUS;
 112                 else
 113                         analog->unit = SR_UNIT_FAHRENHEIT;
 114         } else if ((u = strstr(e, "A AC")) || (u = strstr(e, "A DC"))) {
 115                 analog->mq = SR_MQ_CURRENT;
 116                 analog->unit = SR_UNIT_AMPERE;
 117                 /* This catches "A AC", "A DC" and "A AC+DC". */
 118                 if (strstr(u, "AC"))
 119                         analog->mqflags |= SR_MQFLAG_AC | SR_MQFLAG_RMS;
 120                 if (strstr(u, "DC"))
 121                         analog->mqflags |= SR_MQFLAG_DC;
 122                 if (!is_oor) {
 123                         if (e[0] == 'm')
 124                                 *analog->data /= 1e+3;
 125                         else if (e[0] == 'u')
 126                                 *analog->data /= 1e+6;
 127                 }
 128         } else if ((u = strstr(e, "Hz"))) {
 129                 analog->mq = SR_MQ_FREQUENCY;
 130                 analog->unit = SR_UNIT_HERTZ;
 131                 if (e[0] == 'k')
 132                         *analog->data *= 1e+3;
 133         } else if (!strcmp(e, "%")) {
 134                 analog->mq = SR_MQ_DUTY_CYCLE;
 135                 analog->unit = SR_UNIT_PERCENTAGE;
 136         } else if ((u = strstr(e, "ms"))) {
 137                 analog->mq = SR_MQ_PULSE_WIDTH;
 138                 analog->unit = SR_UNIT_SECOND;
 139                 *analog->data /= 1e+3;
 140         }
 141
 142         if (analog->mq == -1) {
 143                 /* Not a valid measurement. */
 144                 g_free(analog->data);
 145                 g_free(analog);
 146                 analog = NULL;
 147         }
 148
 149         return analog;
 150 }
 151
 152 static struct sr_datafeed_analog *handle_qm_28x(const struct sr_dev_inst *sdi,
 153                 char **tokens)
 154 {
 155         struct sr_datafeed_analog *analog;
 156         float fvalue;
 157         char *eptr;
 158
 159         if (!tokens[1])
 160                 return NULL;
 161
 162         fvalue = strtof(tokens[0], &eptr);
 163         if (fvalue == 0.0 && eptr == tokens[0]) {
 164                 sr_err("Invalid float.");
 165                 return NULL;
 166         }
 167
 168         if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog))))
 169                 return NULL;
 170         if (!(analog->data = g_try_malloc(sizeof(float))))
 171                 return NULL;
 172         analog->probes = sdi->probes;
 173         analog->num_samples = 1;
 174         *analog->data = fvalue;
 175         analog->mq = -1;
 176
 177         if (!strcmp(tokens[1], "VAC") || !strcmp(tokens[1], "VDC")) {
 178                 analog->mq = SR_MQ_VOLTAGE;
 179                 analog->unit = SR_UNIT_VOLT;
 180                 if (!strcmp(tokens[2], "NORMAL")) {
 181                         if (tokens[1][1] == 'A') {
 182                                 analog->mqflags |= SR_MQFLAG_AC;
 183                                 analog->mqflags |= SR_MQFLAG_RMS;
 184                         } else
 185                                 analog->mqflags |= SR_MQFLAG_DC;
 186                 } else if (!strcmp(tokens[2], "OL") || !strcmp(tokens[2], "OL_MINUS")) {
 187                         *analog->data = NAN;
 188                 } else
 189                         analog->mq = -1;
 190         } else if (!strcmp(tokens[1], "dBV") || !strcmp(tokens[1], "dBm")) {
 191                 analog->mq = SR_MQ_VOLTAGE;
 192                 if (tokens[1][2] == 'm')
 193                         analog->unit = SR_UNIT_DECIBEL_MW;
 194                 else
 195                         analog->unit = SR_UNIT_DECIBEL_VOLT;
 196                 analog->mqflags |= SR_MQFLAG_AC | SR_MQFLAG_RMS;
 197         } else if (!strcmp(tokens[1], "CEL") || !strcmp(tokens[1], "FAR")) {
 198                 if (!strcmp(tokens[2], "NORMAL")) {
 199                         analog->mq = SR_MQ_TEMPERATURE;
 200                         if (tokens[1][0] == 'C')
 201                                 analog->unit = SR_UNIT_CELSIUS;
 202                         else
 203                                 analog->unit = SR_UNIT_FAHRENHEIT;
 204                 }
 205         } else if (!strcmp(tokens[1], "OHM")) {
 206                 if (!strcmp(tokens[3], "NONE")) {
 207                         analog->mq = SR_MQ_RESISTANCE;
 208                         analog->unit = SR_UNIT_OHM;
 209                         if (!strcmp(tokens[2], "OL") || !strcmp(tokens[2], "OL_MINUS")) {
 210                                 *analog->data = INFINITY;
 211                         } else if (strcmp(tokens[2], "NORMAL"))
 212                                 analog->mq = -1;
 213                 } else if (!strcmp(tokens[3], "OPEN_CIRCUIT")) {
 214                         analog->mq = SR_MQ_CONTINUITY;
 215                         analog->unit = SR_UNIT_BOOLEAN;
 216                         *analog->data = 0.0;
 217                 } else if (!strcmp(tokens[3], "SHORT_CIRCUIT")) {
 218                         analog->mq = SR_MQ_CONTINUITY;
 219                         analog->unit = SR_UNIT_BOOLEAN;
 220                         *analog->data = 1.0;
 221                 }
 222         } else if (!strcmp(tokens[1], "F")
 223                         && !strcmp(tokens[2], "NORMAL")
 224                         && !strcmp(tokens[3], "NONE")) {
 225                 analog->mq = SR_MQ_CAPACITANCE;
 226                 analog->unit = SR_UNIT_FARAD;
 227         } else if (!strcmp(tokens[1], "AAC") || !strcmp(tokens[1], "ADC")) {
 228                 analog->mq = SR_MQ_CURRENT;
 229                 analog->unit = SR_UNIT_AMPERE;
 230                 if (!strcmp(tokens[2], "NORMAL")) {
 231                         if (tokens[1][1] == 'A') {
 232                                 analog->mqflags |= SR_MQFLAG_AC;
 233                                 analog->mqflags |= SR_MQFLAG_RMS;
 234                         } else
 235                                 analog->mqflags |= SR_MQFLAG_DC;
 236                 } else if (!strcmp(tokens[2], "OL") || !strcmp(tokens[2], "OL_MINUS")) {
 237                         *analog->data = NAN;
 238                 } else
 239                         analog->mq = -1;
 240         } if (!strcmp(tokens[1], "Hz") && !strcmp(tokens[2], "NORMAL")) {
 241                 analog->mq = SR_MQ_FREQUENCY;
 242                 analog->unit = SR_UNIT_HERTZ;
 243         } else if (!strcmp(tokens[1], "PCT") && !strcmp(tokens[2], "NORMAL")) {
 244                 analog->mq = SR_MQ_DUTY_CYCLE;
 245                 analog->unit = SR_UNIT_PERCENTAGE;
 246         } else if (!strcmp(tokens[1], "S") && !strcmp(tokens[2], "NORMAL")) {
 247                 analog->mq = SR_MQ_PULSE_WIDTH;
 248                 analog->unit = SR_UNIT_SECOND;
 249         } else if (!strcmp(tokens[1], "SIE") && !strcmp(tokens[2], "NORMAL")) {
 250                 analog->mq = SR_MQ_CONDUCTANCE;
 251                 analog->unit = SR_UNIT_SIEMENS;
 252         }
 253
 254         if (analog->mq == -1) {
 255                 /* Not a valid measurement. */
 256                 g_free(analog->data);
 257                 g_free(analog);
 258                 analog = NULL;
 259         }
 260
 261         return analog;
 262 }
 263
 264 static void handle_qm_19x_meta(const struct sr_dev_inst *sdi, char **tokens)
 265 {
 266         struct dev_context *devc;
 267         int meas_type, meas_unit, meas_char, i;
 268
 269         /* Make sure we have 7 valid tokens. */
 270         for (i = 0; tokens[i] && i < 7; i++);
 271         if (i != 7)
 272                 return;
 273
 274         if (strcmp(tokens[1], "1"))
 275                 /* Invalid measurement. */
 276                 return;
 277
 278         if (strcmp(tokens[2], "3"))
 279                 /* Only interested in input from the meter mode source. */
 280                 return;
 281
 282         devc = sdi->priv;
 283
 284         /* Measurement type 11 == absolute, 19 = relative */
 285         meas_type = strtol(tokens[0], NULL, 10);
 286         if (meas_type != 11 && meas_type != 19)
 287                 /* Device is in some mode we don't support. */
 288                 return;
 289
 290         /* We might get metadata for absolute and relative mode (if the device
 291          * is in relative mode). In that case, relative takes precedence. */
 292         if (meas_type == 11 && devc->meas_type == 19)
 293                 return;
 294
 295         meas_unit = strtol(tokens[3], NULL, 10);
 296         if (meas_unit == 0)
 297                 /* Device is turned off. Really. */
 298                 return;
 299         meas_char = strtol(tokens[4], NULL, 10);
 300
 301         devc->mq = devc->unit = -1;
 302         devc->mqflags = 0;
 303         switch (meas_unit) {
 304         case 1:
 305                 devc->mq = SR_MQ_VOLTAGE;
 306                 devc->unit = SR_UNIT_VOLT;
 307                 if (meas_char == 1)
 308                         devc->mqflags |= SR_MQFLAG_DC;
 309                 else if (meas_char == 2)
 310                         devc->mqflags |= SR_MQFLAG_AC;
 311                 else if (meas_char == 3)
 312                         devc->mqflags |= SR_MQFLAG_DC | SR_MQFLAG_AC;
 313                 else if (meas_char == 15)
 314                         devc->mqflags |= SR_MQFLAG_DIODE;
 315                 break;
 316         case 2:
 317                 devc->mq = SR_MQ_CURRENT;
 318                 devc->unit = SR_UNIT_AMPERE;
 319                 if (meas_char == 1)
 320                         devc->mqflags |= SR_MQFLAG_DC;
 321                 else if (meas_char == 2)
 322                         devc->mqflags |= SR_MQFLAG_AC;
 323                 else if (meas_char == 3)
 324                         devc->mqflags |= SR_MQFLAG_DC | SR_MQFLAG_AC;
 325                 break;
 326         case 3:
 327                 if (meas_char == 1) {
 328                         devc->mq = SR_MQ_RESISTANCE;
 329                         devc->unit = SR_UNIT_OHM;
 330                 } else if (meas_char == 16) {
 331                         devc->mq = SR_MQ_CONTINUITY;
 332                         devc->unit = SR_UNIT_BOOLEAN;
 333                 }
 334                 break;
 335         case 12:
 336                 devc->mq = SR_MQ_TEMPERATURE;
 337                 devc->unit = SR_UNIT_CELSIUS;
 338                 break;
 339         case 13:
 340                 devc->mq = SR_MQ_TEMPERATURE;
 341                 devc->unit = SR_UNIT_FAHRENHEIT;
 342                 break;
 343         default:
 344                 sr_dbg("unknown unit: %d", meas_unit);
 345         }
 346         if (devc->mq == -1 && devc->unit == -1)
 347                 return;
 348
 349         /* If we got here, we know how to interpret the measurement. */
 350         devc->meas_type = meas_type;
 351         if (meas_type == 11)
 352                 /* Absolute meter reading. */
 353                 devc->is_relative = FALSE;
 354         else if (!strcmp(tokens[0], "19"))
 355                 /* Relative meter reading. */
 356                 devc->is_relative = TRUE;
 357
 358 }
 359
 360 static void handle_qm_19x_data(const struct sr_dev_inst *sdi, char **tokens)
 361 {
 362         struct dev_context *devc;
 363         struct sr_datafeed_packet packet;
 364         struct sr_datafeed_analog analog;
 365         float fvalue;
 366         char *eptr;
 367
 368         if (!strcmp(tokens[0], "9.9E+37")) {
 369                 /* An invalid measurement shows up on the display as "OL", but
 370                  * comes through like this. Since comparing 38-digit floats
 371                  * is rather problematic, we'll cut through this here. */
 372                 fvalue = NAN;
 373         } else {
 374                 fvalue = strtof(tokens[0], &eptr);
 375                 if (fvalue == 0.0 && eptr == tokens[0]) {
 376                         sr_err("Invalid float '%s'.", tokens[0]);
 377                         return;
 378                 }
 379         }
 380
 381         devc = sdi->priv;
 382         if (devc->mq == -1 || devc->unit == -1)
 383                 /* Don't have valid metadata yet. */
 384                 return;
 385
 386
 387         if (devc->mq == SR_MQ_RESISTANCE && isnan(fvalue))
 388                 fvalue = INFINITY;
 389         else if (devc->mq == SR_MQ_CONTINUITY) {
 390                 if (isnan(fvalue))
 391                         fvalue = 0.0;
 392                 else
 393                         fvalue = 1.0;
 394         }
 395
 396         analog.probes = sdi->probes;
 397         analog.num_samples = 1;
 398         analog.data = &fvalue;
 399         analog.mq = devc->mq;
 400         analog.unit = devc->unit;
 401         analog.mqflags = 0;
 402         packet.type = SR_DF_ANALOG;
 403         packet.payload = &analog;
 404         sr_session_send(devc->cb_data, &packet);
 405         devc->num_samples++;
 406
 407 }
 408
 409 static void handle_line(const struct sr_dev_inst *sdi)
 410 {
 411         struct dev_context *devc;
 412         struct sr_serial_dev_inst *serial;
 413         struct sr_datafeed_packet packet;
 414         struct sr_datafeed_analog *analog;
 415         int num_tokens, n, i;
 416         char cmd[16], **tokens;
 417
 418         devc = sdi->priv;
 419         serial = sdi->conn;
 420         sr_spew("Received line '%s' (%d).", devc->buf, devc->buflen);
 421
 422         if (devc->buflen == 1) {
 423                 if (devc->buf[0] != '0') {
 424                         /* Not just a CMD_ACK from the query command. */
 425                         sr_dbg("Got CMD_ACK '%c'.", devc->buf[0]);
 426                         devc->expect_response = FALSE;
 427                 }
 428                 devc->buflen = 0;
 429                 return;
 430         }
 431
 432         analog = NULL;
 433         tokens = g_strsplit(devc->buf, ",", 0);
 434         if (tokens[0]) {
 435                 if (devc->profile->model == FLUKE_187) {
 436                         devc->expect_response = FALSE;
 437                         analog = handle_qm_18x(sdi, tokens);
 438                 } else if (devc->profile->model == FLUKE_287) {
 439                         devc->expect_response = FALSE;
 440                         analog = handle_qm_28x(sdi, tokens);
 441                 } else if (devc->profile->model == FLUKE_190) {
 442                         devc->expect_response = FALSE;
 443                         for (num_tokens = 0; tokens[num_tokens]; num_tokens++);
 444                         if (num_tokens >= 7) {
 445                                 /* Response to QM: this is a comma-separated list of
 446                                  * fields with metadata about the measurement. This
 447                                  * format can return multiple sets of metadata,
 448                                  * split into sets of 7 tokens each. */
 449                                 devc->meas_type = 0;
 450                                 for (i = 0; i < num_tokens; i += 7)
 451                                         handle_qm_19x_meta(sdi, tokens + i);
 452                                 if (devc->meas_type) {
 453                                         /* Slip the request in now, before the main
 454                                          * timer loop asks for metadata again. */
 455                                         n = sprintf(cmd, "QM %d\r", devc->meas_type);
 456                                         if (serial_write(serial, cmd, n) == -1)
 457                                                 sr_err("Unable to send QM (measurement): %s.",
 458                                                                 strerror(errno));
 459                                 }
 460                         } else {
 461                                 /* Response to QM <n> measurement request. */
 462                                 handle_qm_19x_data(sdi, tokens);
 463                         }
 464                 }
 465         }
 466         g_strfreev(tokens);
 467         devc->buflen = 0;
 468
 469         if (analog) {
 470                 /* Got a measurement. */
 471                 packet.type = SR_DF_ANALOG;
 472                 packet.payload = analog;
 473                 sr_session_send(devc->cb_data, &packet);
 474                 devc->num_samples++;
 475                 g_free(analog->data);
 476                 g_free(analog);
 477         }
 478
 479 }
 480
 481 SR_PRIV int fluke_receive_data(int fd, int revents, void *cb_data)
 482 {
 483         struct sr_dev_inst *sdi;
 484         struct dev_context *devc;
 485         struct sr_serial_dev_inst *serial;
 486         int len;
 487         int64_t now, elapsed;
 488
 489         (void)fd;
 490
 491         if (!(sdi = cb_data))
 492                 return TRUE;
 493
 494         if (!(devc = sdi->priv))
 495                 return TRUE;
 496
 497         serial = sdi->conn;
 498         if (revents == G_IO_IN) {
 499                 /* Serial data arrived. */
 500                 while(FLUKEDMM_BUFSIZE - devc->buflen - 1 > 0) {
 501                         len = serial_read(serial, devc->buf + devc->buflen, 1);
 502                         if (len < 1)
 503                                 break;
 504                         devc->buflen++;
 505                         *(devc->buf + devc->buflen) = '\0';
 506                         if (*(devc->buf + devc->buflen - 1) == '\r') {
 507                                 *(devc->buf + --devc->buflen) = '\0';
 508                                 handle_line(sdi);
 509                                 break;
 510                         }
 511                 }
 512         }
 513
 514         if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
 515                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 516                 return TRUE;
 517         }
 518
 519         now = g_get_monotonic_time() / 1000;
 520         elapsed = now - devc->cmd_sent_at;
 521         /* Send query command at poll_period interval, or after 1 second
 522          * has elapsed. This will make it easier to recover from any
 523          * out-of-sync or temporary disconnect issues. */
 524         if ((devc->expect_response == FALSE && elapsed > devc->profile->poll_period)
 525                         || elapsed > devc->profile->timeout) {
 526                 if (serial_write(serial, "QM\r", 3) == -1)
 527                         sr_err("Unable to send QM: %s.", strerror(errno));
 528                 devc->cmd_sent_at = now;
 529                 devc->expect_response = TRUE;
 530         }
 531
 532         return TRUE;
 533 }