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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,
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         return SR_OK;
209 }
210
211 static int dev_close(struct sr_dev_inst *sdi)
212 {
213         struct sr_scpi_dev_inst *scpi = sdi->conn;
214
215         /* Disable scan-advance (preserve relay life). */
216         sr_scpi_send(scpi, "SADV HOLD");
217         /* Switch back to auto-triggering. */
218         sr_scpi_send(scpi, "TRIG AUTO");
219
220         sr_scpi_close(scpi);
221
222         return SR_OK;
223 }
224
225 static int config_get(uint32_t key, GVariant **data,
226         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
227 {
228         struct dev_context *devc;
229
230         (void)cg;
231
232         devc = sdi->priv;
233
234         switch (key) {
235         case SR_CONF_ADC_POWERLINE_CYCLES:
236                 *data = g_variant_new_double(devc->nplc);
237                 break;
238         default:
239                 return SR_ERR_NA;
240         }
241
242         return SR_OK;
243 }
244
245 static int config_set(uint32_t key, GVariant *data,
246         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
247 {
248         enum sr_mq mq;
249         enum sr_mqflag mq_flags;
250         struct dev_context *devc;
251         GVariant *tuple_child;
252
253         (void)cg;
254
255         devc = sdi->priv;
256
257         switch (key) {
258         case SR_CONF_LIMIT_SAMPLES:
259                 devc->limit_samples = g_variant_get_uint64(data);
260                 break;
261         case SR_CONF_MEASURED_QUANTITY:
262                 tuple_child = g_variant_get_child_value(data, 0);
263                 mq = g_variant_get_uint32(tuple_child);
264                 tuple_child = g_variant_get_child_value(data, 1);
265                 mq_flags = g_variant_get_uint64(tuple_child);
266                 g_variant_unref(tuple_child);
267                 return hp_3457a_set_mq(sdi, mq, mq_flags);
268         case SR_CONF_ADC_POWERLINE_CYCLES:
269                 return hp_3457a_set_nplc(sdi, g_variant_get_double(data));
270         default:
271                 return SR_ERR_NA;
272         }
273
274         return SR_OK;
275 }
276
277 static int config_list(uint32_t key, GVariant **data,
278         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
279 {
280         /*
281          * TODO: Implement channel group configuration when adding support for
282          * plug-in cards.
283          */
284
285         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
286 }
287
288 static void create_channel_index_list(GSList *channels, GArray **arr)
289 {
290         struct sr_channel *channel;
291         struct channel_context *chanc;
292         GSList *list_elem;
293
294         *arr = g_array_new(FALSE, FALSE, sizeof(unsigned int));
295
296         for (list_elem = channels; list_elem; list_elem = list_elem->next) {
297                 channel = list_elem->data;
298                 chanc = channel->priv;
299                 g_array_append_val(*arr, chanc->index);
300         }
301 }
302
303 /*
304  * TRIG SGL
305  *   Trigger the first measurement, then hold. We can't let the instrument
306  *   auto-trigger because we read several registers to make a complete
307  *   reading. If the instrument were auto-triggering, we could get the
308  *   reading for sample N, but a new measurement is made and when we read the
309  *   HIRES register, it contains data for sample N+1. This would produce
310  *   wrong readings.
311  * SADV AUTO
312  *   Activate the scan-advance feature. This automatically connects the next
313  *   channel in the scan list to the A/D converter. This way, we do not need to
314  *   occupy the HP-IB bus to send channel select commands.
315  */
316 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
317 {
318         int ret;
319         gboolean front_selected, rear_selected;
320         struct sr_scpi_dev_inst *scpi;
321         struct sr_channel *channel;
322         struct dev_context *devc;
323         struct channel_context *chanc;
324         GArray *ch_list;
325         GSList *channels;
326
327         scpi = sdi->conn;
328         devc = sdi->priv;
329
330         ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 100,
331                                  hp_3457a_receive_data, (void *)sdi);
332         if (ret != SR_OK)
333                 return ret;
334
335         std_session_send_df_header(sdi);
336
337         front_selected = rear_selected = FALSE;
338         devc->active_channels = NULL;
339
340         for (channels = sdi->channels; channels; channels = channels->next) {
341                 channel = channels->data;
342
343                 if (!channel->enabled)
344                         continue;
345
346                 chanc = channel->priv;
347
348                 if (chanc->location == CONN_FRONT)
349                         front_selected = TRUE;
350                 if (chanc->location == CONN_REAR)
351                         rear_selected = TRUE;
352
353                 devc->active_channels = g_slist_append(devc->active_channels, channel);
354         }
355
356         if (front_selected && rear_selected) {
357                 sr_err("Can not use front and rear channels at the same time!");
358                 g_slist_free(devc->active_channels);
359                 return SR_ERR_ARG;
360         }
361
362         devc->num_active_channels = g_slist_length(devc->active_channels);
363         if (!devc->num_active_channels) {
364                 sr_err("Need at least one active channel!");
365                 g_slist_free(devc->active_channels);
366                 return SR_ERR_ARG;
367         }
368         devc->current_channel = devc->active_channels->data;
369
370         hp_3457a_select_input(sdi, front_selected ? CONN_FRONT : CONN_REAR);
371
372         /* For plug-in cards, use the scan-advance features to scan channels. */
373         if (rear_selected && (devc->rear_card->card_id != REAR_TERMINALS)) {
374                 create_channel_index_list(devc->active_channels, &ch_list);
375                 hp_3457a_send_scan_list(sdi, (void *)ch_list->data, ch_list->len);
376                 sr_scpi_send(scpi, "SADV AUTO");
377                 g_array_free(ch_list, TRUE);
378         }
379
380         /* Start first measurement. */
381         sr_scpi_send(scpi, "TRIG SGL");
382         devc->acq_state = ACQ_TRIGGERED_MEASUREMENT;
383         devc->num_samples = 0;
384
385         return SR_OK;
386 }
387
388 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
389 {
390         struct dev_context *devc;
391
392         devc = sdi->priv;
393
394         g_slist_free(devc->active_channels);
395
396         return SR_OK;
397 }
398
399 static struct sr_dev_driver hp_3457a_driver_info = {
400         .name = "hp-3457a",
401         .longname = "HP 3457A",
402         .api_version = 1,
403         .init = std_init,
404         .cleanup = std_cleanup,
405         .scan = scan,
406         .dev_list = std_dev_list,
407         .dev_clear = std_dev_clear,
408         .config_get = config_get,
409         .config_set = config_set,
410         .config_list = config_list,
411         .dev_open = dev_open,
412         .dev_close = dev_close,
413         .dev_acquisition_start = dev_acquisition_start,
414         .dev_acquisition_stop = dev_acquisition_stop,
415         .context = NULL,
416 };
417 SR_REGISTER_DEV_DRIVER(hp_3457a_driver_info);