src/hardware/hp-3457a/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2016 Alexandru Gagniuc <mr.nuke.me@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 <scpi.h>
  22 #include <string.h>
  23 #include "protocol.h"
  24
  25 static const uint32_t scanopts[] = {
  26         SR_CONF_CONN,
  27 };
  28
  29 static const uint32_t drvopts[] = {
  30         SR_CONF_MULTIMETER,
  31 };
  32
  33 static const uint32_t devopts[] = {
  34         SR_CONF_CONTINUOUS,
  35         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  36         SR_CONF_MEASURED_QUANTITY | SR_CONF_SET,
  37         SR_CONF_ADC_POWERLINE_CYCLES | SR_CONF_SET | SR_CONF_GET,
  38 };
  39
  40 static struct sr_dev_driver hp_3457a_driver_info;
  41
  42 static int create_front_channel(struct sr_dev_inst *sdi, int chan_idx)
  43 {
  44         struct sr_channel *channel;
  45         struct sr_channel_group *front;
  46         struct channel_context *chanc;
  47
  48         chanc = g_malloc(sizeof(*chanc));
  49         chanc->location = CONN_FRONT;
  50
  51         channel = sr_channel_new(sdi, chan_idx++, SR_CHANNEL_ANALOG,
  52                                  TRUE, "Front");
  53         channel->priv = chanc;
  54
  55         front = g_malloc0(sizeof(*front));
  56         front->name = g_strdup("Front");
  57         front->channels = g_slist_append(front->channels, channel);
  58
  59         sdi->channel_groups = g_slist_append(sdi->channel_groups, front);
  60
  61         return chan_idx;
  62 }
  63
  64 static int create_rear_channels(struct sr_dev_inst *sdi, int chan_idx,
  65                                  const struct rear_card_info *card)
  66 {
  67         unsigned int i;
  68         struct sr_channel *channel;
  69         struct sr_channel_group *group;
  70         struct channel_context *chanc;
  71         char name[16];
  72
  73         /* When card is NULL, we couldn't identify the type of card. */
  74         if (!card)
  75                 return chan_idx;
  76
  77         group = g_malloc0(sizeof(*group));
  78         group->priv = NULL;
  79         group->name = g_strdup(card->cg_name);
  80         sdi->channel_groups = g_slist_append(sdi->channel_groups, group);
  81
  82         for (i = 0; i < card->num_channels; i++) {
  83
  84                 chanc = g_malloc(sizeof(*chanc));
  85                 chanc->location = CONN_REAR;
  86
  87                 if (card->type == REAR_TERMINALS) {
  88                         chanc->index = -1;
  89                         g_snprintf(name, sizeof(name), "%s", card->cg_name);
  90                 } else {
  91                         chanc->index = i;
  92                         g_snprintf(name, sizeof(name), "%s%u", card->cg_name, i);
  93                 }
  94
  95                 channel = sr_channel_new(sdi, chan_idx++, SR_CHANNEL_ANALOG,
  96                                         FALSE, name);
  97                 channel->priv = chanc;
  98                 group->channels = g_slist_append(group->channels, channel);
  99         }
 100
 101         return chan_idx;
 102 }
 103
 104 static gchar *get_revision(struct sr_scpi_dev_inst *scpi)
 105 {
 106         int ret, major, minor;
 107         GArray *rev_numbers;
 108
 109         /* Report a version of '0.0' if we can't parse the response. */
 110         major = minor = 0;
 111
 112         ret = sr_scpi_get_floatv(scpi, "REV?", &rev_numbers);
 113         if ((ret == SR_OK) && (rev_numbers->len >= 2)) {
 114                 major = (int)g_array_index(rev_numbers, float, 0);
 115                 minor = (int)g_array_index(rev_numbers, float, 1);
 116         }
 117
 118         g_array_free(rev_numbers, TRUE);
 119
 120         return g_strdup_printf("%d.%d", major, minor);
 121 }
 122
 123 static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 124 {
 125         int ret, idx;
 126         char *response;
 127         struct sr_dev_inst *sdi;
 128         struct dev_context *devc;
 129
 130         /*
 131          * This command ensures we receive an EOI after every response, so that
 132          * we don't wait the entire timeout after the response is received.
 133          */
 134         if (sr_scpi_send(scpi, "END ALWAYS") != SR_OK)
 135                 return NULL;
 136
 137         ret = sr_scpi_get_string(scpi, "ID?", &response);
 138         if ((ret != SR_OK) || !response)
 139                 return NULL;
 140
 141         if (strcmp(response, "HP3457A"))
 142                 return NULL;
 143
 144         g_free(response);
 145
 146         devc = g_malloc0(sizeof(struct dev_context));
 147         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 148         sdi->vendor = g_strdup("Hewlett-Packard");
 149         sdi->model = g_strdup("3457A");
 150         sdi->version = get_revision(scpi);
 151         sdi->conn = scpi;
 152         sdi->driver = &hp_3457a_driver_info;
 153         sdi->inst_type = SR_INST_SCPI;
 154         sdi->priv = devc;
 155
 156         /* There is no way to probe the measurement mode. It must be set. */
 157         devc->measurement_mq = 0;
 158         devc->measurement_unit = 0;
 159
 160         /* Probe rear card option and create channels accordingly (TODO). */
 161         devc->rear_card = hp_3457a_probe_rear_card(scpi);
 162         idx = 0;
 163         idx = create_front_channel(sdi, idx);
 164         create_rear_channels(sdi, idx, devc->rear_card);
 165
 166         return sdi;
 167 }
 168
 169 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 170 {
 171         return sr_scpi_scan(di->context, options, probe_device);
 172 }
 173
 174 /*
 175  * We need to set the HP 3457A to a known state, and there are quite a number
 176  * of knobs to tweak. Here's a brief explanation of what's going on. For more
 177  * details, print out and consult the user manual.
 178  *   PRESET
 179  *     Set the instrument to a pre-determined state. This is easier and faster
 180  *     than sending a few dozen commands. Some of the PRESET defaults include
 181  *     ASCII output format, and synchronous triggering. See user manual for
 182  *     more details.
 183  *
 184  * After the PRESET command, the instrument is in a known state, and only those
 185  * parameters for which the default is unsuitable are modified:
 186  *   INBUF ON
 187  *     Enable the HP-IB input buffer. This allows the instrument to release the
 188  *     HP-IB bus before processing the command, and increases throughput on
 189  *     GPIB buses with more than one device.
 190  *   TRIG HOLD
 191  *     Do not trigger new measurements until instructed to do so.
 192  */
 193 static int dev_open(struct sr_dev_inst *sdi)
 194 {
 195         struct sr_scpi_dev_inst *scpi = sdi->conn;
 196         struct dev_context *devc;
 197
 198         if (sr_scpi_open(scpi) != SR_OK)
 199                 return SR_ERR;
 200
 201         devc = sdi->priv;
 202
 203         sr_scpi_send(scpi, "PRESET");
 204         sr_scpi_send(scpi, "INBUF ON");
 205         sr_scpi_send(scpi, "TRIG HOLD");
 206         sr_scpi_get_float(scpi, "NPLC?", &devc->nplc);
 207
 208         sdi->status = SR_ST_ACTIVE;
 209
 210         return SR_OK;
 211 }
 212
 213 static int dev_close(struct sr_dev_inst *sdi)
 214 {
 215         struct sr_scpi_dev_inst *scpi = sdi->conn;
 216
 217         if (sdi->status != SR_ST_ACTIVE)
 218                 return SR_ERR_DEV_CLOSED;
 219
 220         /* Disable scan-advance (preserve relay life). */
 221         sr_scpi_send(scpi, "SADV HOLD");
 222         /* Switch back to auto-triggering. */
 223         sr_scpi_send(scpi, "TRIG AUTO");
 224
 225         sr_scpi_close(scpi);
 226
 227         sdi->status = SR_ST_INACTIVE;
 228
 229         return SR_OK;
 230 }
 231
 232 static int config_get(uint32_t key, GVariant **data,
 233         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 234 {
 235         int ret;
 236         struct dev_context *devc;
 237
 238         (void)cg;
 239
 240         devc = sdi->priv;
 241
 242         ret = SR_OK;
 243         switch (key) {
 244         case SR_CONF_ADC_POWERLINE_CYCLES:
 245                 *data = g_variant_new_double(devc->nplc);
 246                 break;
 247         default:
 248                 return SR_ERR_NA;
 249         }
 250
 251         return ret;
 252 }
 253
 254 static int config_set(uint32_t key, GVariant *data,
 255                       const struct sr_dev_inst *sdi,
 256                       const struct sr_channel_group *cg)
 257 {
 258         int ret;
 259         enum sr_mq mq;
 260         enum sr_mqflag mq_flags;
 261         struct dev_context *devc;
 262         GVariant *tuple_child;
 263
 264         (void)cg;
 265
 266         devc = sdi->priv;
 267
 268         ret = SR_OK;
 269         switch (key) {
 270         case SR_CONF_LIMIT_SAMPLES:
 271                 devc->limit_samples = g_variant_get_uint64(data);
 272                 break;
 273         case SR_CONF_MEASURED_QUANTITY:
 274                 tuple_child = g_variant_get_child_value(data, 0);
 275                 mq = g_variant_get_uint32(tuple_child);
 276                 tuple_child = g_variant_get_child_value(data, 1);
 277                 mq_flags = g_variant_get_uint64(tuple_child);
 278                 ret = hp_3457a_set_mq(sdi, mq, mq_flags);
 279                 g_variant_unref(tuple_child);
 280                 break;
 281         case SR_CONF_ADC_POWERLINE_CYCLES:
 282                 ret = hp_3457a_set_nplc(sdi, g_variant_get_double(data));
 283                 break;
 284         default:
 285                 ret = SR_ERR_NA;
 286         }
 287
 288         return ret;
 289 }
 290
 291 static int config_list(uint32_t key, GVariant **data,
 292         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 293 {
 294         int ret;
 295
 296         if (key == SR_CONF_SCAN_OPTIONS) {
 297                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 298                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 299                 return SR_OK;
 300         } else if ((key == SR_CONF_DEVICE_OPTIONS) && !sdi) {
 301                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 302                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 303                 return SR_OK;
 304         } else if ((key == SR_CONF_DEVICE_OPTIONS) && !cg) {
 305                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 306                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 307                 return SR_OK;
 308         }
 309
 310         /* From here on, we're only concerned with channel group config. */
 311         if (!cg)
 312                 return SR_ERR_NA;
 313
 314         /*
 315          * TODO: Implement channel group configuration when adding support for
 316          * plug-in cards.
 317          */
 318
 319         ret = SR_OK;
 320         switch (key) {
 321         default:
 322                 ret = SR_ERR_NA;
 323         }
 324
 325         return ret;
 326 }
 327
 328 static void create_channel_index_list(GSList *channels, GArray **arr)
 329 {
 330         struct sr_channel *channel;
 331         struct channel_context *chanc;
 332         GSList *list_elem;
 333
 334         *arr = g_array_new(FALSE, FALSE, sizeof(unsigned int));
 335
 336         for (list_elem = channels; list_elem; list_elem = list_elem->next) {
 337                 channel = list_elem->data;
 338                 chanc = channel->priv;
 339                 g_array_append_val(*arr, chanc->index);
 340         }
 341 }
 342
 343 /*
 344  * TRIG SGL
 345  *   Trigger the first measurement, then hold. We can't let the instrument
 346  *   auto-trigger because we read several registers to make a complete
 347  *   reading. If the instrument were auto-triggering, we could get the
 348  *   reading for sample N, but a new measurement is made and when we read the
 349  *   HIRES register, it contains data for sample N+1. This would produce
 350  *   wrong readings.
 351  * SADV AUTO
 352  *   Activate the scan-advance feature. This automatically connects the next
 353  *   channel in the scan list to the A/D converter. This way, we do not need to
 354  *   occupy the HP-IB bus to send channel select commands.
 355  */
 356 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 357 {
 358         int ret;
 359         gboolean front_selected, rear_selected;
 360         struct sr_scpi_dev_inst *scpi;
 361         struct sr_channel *channel;
 362         struct dev_context *devc;
 363         struct channel_context *chanc;
 364         GArray *ch_list;
 365         GSList *channels;
 366
 367         scpi = sdi->conn;
 368         devc = sdi->priv;
 369
 370         ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 100,
 371                                  hp_3457a_receive_data, (void *)sdi);
 372         if (ret != SR_OK)
 373                 return ret;
 374
 375         std_session_send_df_header(sdi);
 376
 377         front_selected = rear_selected = FALSE;
 378         devc->active_channels = NULL;
 379
 380         for (channels = sdi->channels; channels; channels = channels->next) {
 381                 channel = channels->data;
 382
 383                 if (!channel->enabled)
 384                         continue;
 385
 386                 chanc = channel->priv;
 387
 388                 if (chanc->location == CONN_FRONT)
 389                         front_selected = TRUE;
 390                 if (chanc->location == CONN_REAR)
 391                         rear_selected = TRUE;
 392
 393                 devc->active_channels = g_slist_append(devc->active_channels, channel);
 394         }
 395
 396         if (front_selected && rear_selected) {
 397                 sr_err("Can not use front and rear channels at the same time!");
 398                 g_slist_free(devc->active_channels);
 399                 return SR_ERR_ARG;
 400         }
 401
 402         devc->current_channel = devc->active_channels->data;
 403         devc->num_active_channels = g_slist_length(devc->active_channels);
 404
 405         hp_3457a_select_input(sdi, front_selected ? CONN_FRONT : CONN_REAR);
 406
 407         /* For plug-in cards, use the scan-advance features to scan channels. */
 408         if (rear_selected && (devc->rear_card->card_id != REAR_TERMINALS)) {
 409                 create_channel_index_list(devc->active_channels, &ch_list);
 410                 hp_3457a_send_scan_list(sdi, (void *)ch_list->data, ch_list->len);
 411                 sr_scpi_send(scpi, "SADV AUTO");
 412                 g_array_free(ch_list, TRUE);
 413         }
 414
 415         /* Start first measurement. */
 416         sr_scpi_send(scpi, "TRIG SGL");
 417         devc->acq_state = ACQ_TRIGGERED_MEASUREMENT;
 418         devc->num_samples = 0;
 419
 420         return SR_OK;
 421 }
 422
 423 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 424 {
 425         struct dev_context *devc;
 426
 427         devc = sdi->priv;
 428
 429         g_slist_free(devc->active_channels);
 430
 431         return SR_OK;
 432 }
 433
 434 static struct sr_dev_driver hp_3457a_driver_info = {
 435         .name = "hp-3457a",
 436         .longname = "HP 3457A",
 437         .api_version = 1,
 438         .init = std_init,
 439         .cleanup = std_cleanup,
 440         .scan = scan,
 441         .dev_list = std_dev_list,
 442         .config_get = config_get,
 443         .config_set = config_set,
 444         .config_list = config_list,
 445         .dev_open = dev_open,
 446         .dev_close = dev_close,
 447         .dev_acquisition_start = dev_acquisition_start,
 448         .dev_acquisition_stop = dev_acquisition_stop,
 449         .context = NULL,
 450 };
 451 SR_REGISTER_DEV_DRIVER(hp_3457a_driver_info);