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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 | SR_CONF_SET,
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 SR_PRIV 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 int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
170 {
171         return std_init(sr_ctx, di, LOG_PREFIX);
172 }
173
174 static GSList *scan(struct sr_dev_driver *di, GSList *options)
175 {
176         return sr_scpi_scan(di->context, options, probe_device);
177 }
178
179 static GSList *dev_list(const struct sr_dev_driver *di)
180 {
181         return ((struct drv_context *)(di->context))->instances;
182 }
183
184 static int dev_clear(const struct sr_dev_driver *di)
185 {
186         return std_dev_clear(di, NULL);
187 }
188
189 /*
190  * We need to set the HP 3457A to a known state, and there are quite a number
191  * of knobs to tweak. Here's a brief explanation of what's going on. For more
192  * details, print out and consult the user manual.
193  *   PRESET
194  *     Set the instrument to a pre-determined state. This is easier and faster
195  *     than sending a few dozen commands. Some of the PRESET defaults include
196  *     ASCII output format, and synchronous triggering. See user manual for
197  *     more details.
198  *
199  * After the PRESET command, the instrument is in a known state, and only those
200  * parameters for which the default is unsuitable are modified:
201  *   INBUF ON
202  *     Enable the HP-IB input buffer. This allows the instrument to release the
203  *     HP-IB bus before processing the command, and increases throughput on
204  *     GPIB buses with more than one device.
205  *   TRIG HOLD
206  *     Do not trigger new measurements until instructed to do so.
207  */
208 static int dev_open(struct sr_dev_inst *sdi)
209 {
210         struct sr_scpi_dev_inst *scpi = sdi->conn;
211         struct dev_context *devc;
212
213         if (sr_scpi_open(scpi) != SR_OK)
214                 return SR_ERR;
215
216         devc = sdi->priv;
217
218         sr_scpi_send(scpi, "PRESET");
219         sr_scpi_send(scpi, "INBUF ON");
220         sr_scpi_send(scpi, "TRIG HOLD");
221         sr_scpi_get_float(scpi, "NPLC?", &devc->nplc);
222
223         sdi->status = SR_ST_ACTIVE;
224
225         return SR_OK;
226 }
227
228 static int dev_close(struct sr_dev_inst *sdi)
229 {
230         struct sr_scpi_dev_inst *scpi = sdi->conn;
231
232         if (sdi->status != SR_ST_ACTIVE)
233                 return SR_ERR_DEV_CLOSED;
234
235         /* Disable scan-advance (preserve relay life). */
236         sr_scpi_send(scpi, "SADV HOLD");
237         /* Switch back to auto-triggering. */
238         sr_scpi_send(scpi, "TRIG AUTO");
239
240         sr_scpi_close(scpi);
241
242         sdi->status = SR_ST_INACTIVE;
243
244         return SR_OK;
245 }
246
247 static int cleanup(const struct sr_dev_driver *di)
248 {
249         return dev_clear(di);
250 }
251
252 static int config_get(uint32_t key, GVariant **data,
253         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
254 {
255         int ret;
256         struct dev_context *devc;
257
258         (void)cg;
259
260         devc = sdi->priv;
261
262         ret = SR_OK;
263         switch (key) {
264         case SR_CONF_ADC_POWERLINE_CYCLES:
265                 *data = g_variant_new_double(devc->nplc);
266                 break;
267         default:
268                 return SR_ERR_NA;
269         }
270
271         return ret;
272 }
273
274 static int config_set(uint32_t key, GVariant *data,
275                       const struct sr_dev_inst *sdi,
276                       const struct sr_channel_group *cg)
277 {
278         int ret;
279         enum sr_mq mq;
280         enum sr_mqflag mq_flags;
281         struct dev_context *devc;
282         GVariant *tuple_child;
283
284         (void)cg;
285
286         if (sdi->status != SR_ST_ACTIVE)
287                 return SR_ERR_DEV_CLOSED;
288
289         devc = sdi->priv;
290
291         ret = SR_OK;
292         switch (key) {
293         case SR_CONF_LIMIT_SAMPLES:
294                 devc->limit_samples = g_variant_get_uint64(data);
295                 break;
296         case SR_CONF_MEASURED_QUANTITY:
297                 tuple_child = g_variant_get_child_value(data, 0);
298                 mq = g_variant_get_uint32(tuple_child);
299                 tuple_child = g_variant_get_child_value(data, 1);
300                 mq_flags = g_variant_get_uint64(tuple_child);
301                 ret = hp_3457a_set_mq(sdi, mq, mq_flags);
302                 g_variant_unref(tuple_child);
303                 break;
304         case SR_CONF_ADC_POWERLINE_CYCLES:
305                 ret = hp_3457a_set_nplc(sdi, g_variant_get_double(data));
306                 break;
307         default:
308                 ret = SR_ERR_NA;
309         }
310
311         return ret;
312 }
313
314 static int config_list(uint32_t key, GVariant **data,
315         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
316 {
317         int ret;
318
319         if (key == SR_CONF_SCAN_OPTIONS) {
320                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
321                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
322                 return SR_OK;
323         } else if ((key == SR_CONF_DEVICE_OPTIONS) && !sdi) {
324                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
325                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
326                 return SR_OK;
327         } else if ((key == SR_CONF_DEVICE_OPTIONS) && !cg) {
328                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
329                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
330                 return SR_OK;
331         }
332
333         /* From here on, we're only concerned with channel group config. */
334         if (!cg)
335                 return SR_ERR_NA;
336
337         /*
338          * TODO: Implement channel group configuration when adding support for
339          * plug-in cards.
340          */
341
342         ret = SR_OK;
343         switch (key) {
344         default:
345                 ret = SR_ERR_NA;
346         }
347
348         return ret;
349 }
350
351 static void create_channel_index_list(GSList *channels, GArray **arr)
352 {
353         struct sr_channel *channel;
354         struct channel_context *chanc;
355         GSList *list_elem;
356
357         *arr = g_array_new(FALSE, FALSE, sizeof(unsigned int));
358
359         for (list_elem = channels; list_elem; list_elem = list_elem->next) {
360                 channel = list_elem->data;
361                 chanc = channel->priv;
362                 g_array_append_val(*arr, chanc->index);
363         }
364 }
365
366 /*
367  * TRIG SGL
368  *   Trigger the first measurement, then hold. We can't let the instrument
369  *   auto-trigger because we read several registers to make a complete
370  *   reading. If the instrument were auto-triggering, we could get the
371  *   reading for sample N, but a new measurement is made and when we read the
372  *   HIRES register, it contains data for sample N+1. This would produce
373  *   wrong readings.
374  * SADV AUTO
375  *   Activate the scan-advance feature. This automatically connects the next
376  *   channel in the scan list to the A/D converter. This way, we do not need to
377  *   occupy the HP-IB bus to send channel select commands.
378  */
379 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
380 {
381         int ret;
382         gboolean front_selected, rear_selected;
383         struct sr_scpi_dev_inst *scpi;
384         struct sr_channel *channel;
385         struct dev_context *devc;
386         struct channel_context *chanc;
387         GArray *ch_list;
388         GSList *channels;
389
390         if (sdi->status != SR_ST_ACTIVE)
391                 return SR_ERR_DEV_CLOSED;
392
393         scpi = sdi->conn;
394         devc = sdi->priv;
395
396         ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 100,
397                                  hp_3457a_receive_data, (void *)sdi);
398         if (ret != SR_OK)
399                 return ret;
400
401         std_session_send_df_header(sdi, LOG_PREFIX);
402
403         front_selected = rear_selected = FALSE;
404         devc->active_channels = NULL;
405
406         for (channels = sdi->channels; channels; channels = channels->next) {
407                 channel = channels->data;
408
409                 if (!channel->enabled)
410                         continue;
411
412                 chanc = channel->priv;
413
414                 if (chanc->location == CONN_FRONT)
415                         front_selected = TRUE;
416                 if (chanc->location == CONN_REAR)
417                         rear_selected = TRUE;
418
419                 devc->active_channels = g_slist_append(devc->active_channels, channel);
420         }
421
422         if (front_selected && rear_selected) {
423                 sr_err("Can not use front and rear channels at the same time!");
424                 g_slist_free(devc->active_channels);
425                 return SR_ERR_ARG;
426         }
427
428         devc->current_channel = devc->active_channels->data;
429         devc->num_active_channels = g_slist_length(devc->active_channels);
430
431         hp_3457a_select_input(sdi, front_selected ? CONN_FRONT : CONN_REAR);
432
433         /* For plug-in cards, use the scan-advance features to scan channels. */
434         if (rear_selected && (devc->rear_card->card_id != REAR_TERMINALS)) {
435                 create_channel_index_list(devc->active_channels, &ch_list);
436                 hp_3457a_send_scan_list(sdi, (void *)ch_list->data, ch_list->len);
437                 sr_scpi_send(scpi, "SADV AUTO");
438                 g_array_free(ch_list, TRUE);
439         }
440
441         /* Start first measurement. */
442         sr_scpi_send(scpi, "TRIG SGL");
443         devc->acq_state = ACQ_TRIGGERED_MEASUREMENT;
444         devc->num_samples = 0;
445
446         return SR_OK;
447 }
448
449 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
450 {
451         struct dev_context *devc;
452
453         devc = sdi->priv;
454
455         g_slist_free(devc->active_channels);
456
457         return SR_OK;
458 }
459
460 SR_PRIV struct sr_dev_driver hp_3457a_driver_info = {
461         .name = "hp-3457a",
462         .longname = "HP 3457A",
463         .api_version = 1,
464         .init = init,
465         .cleanup = cleanup,
466         .scan = scan,
467         .dev_list = dev_list,
468         .dev_clear = dev_clear,
469         .config_get = config_get,
470         .config_set = config_set,
471         .config_list = config_list,
472         .dev_open = dev_open,
473         .dev_close = dev_close,
474         .dev_acquisition_start = dev_acquisition_start,
475         .dev_acquisition_stop = dev_acquisition_stop,
476         .context = NULL,
477 };