]> sigrok.org Git - libsigrok.git/blob - hardware/demo/demo.c
demo: Moved demo configuration variables into dev_context
[libsigrok.git] / hardware / demo / demo.c
1 /*
2  * This file is part of the sigrok project.
3  *
4  * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5  * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
6  * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
21  */
22
23 #include <stdlib.h>
24 #include <unistd.h>
25 #include <string.h>
26 #ifdef _WIN32
27 #include <io.h>
28 #include <fcntl.h>
29 #define pipe(fds) _pipe(fds, 4096, _O_BINARY)
30 #endif
31 #include "libsigrok.h"
32 #include "libsigrok-internal.h"
33
34 /* Message logging helpers with driver-specific prefix string. */
35 #define DRIVER_LOG_DOMAIN "demo: "
36 #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
37 #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
38 #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
39 #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
40 #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
41 #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
42
43 /* TODO: Number of probes should be configurable. */
44 #define NUM_PROBES             8
45
46 #define DEMONAME               "Demo device"
47
48 /* The size of chunks to send through the session bus. */
49 /* TODO: Should be configurable. */
50 #define BUFSIZE                4096
51
52 #define STR_PATTERN_SIGROK   "sigrok"
53 #define STR_PATTERN_RANDOM   "random"
54 #define STR_PATTERN_INC      "incremental"
55 #define STR_PATTERN_ALL_LOW  "all-low"
56 #define STR_PATTERN_ALL_HIGH "all-high"
57
58 /* Supported patterns which we can generate */
59 enum {
60         /**
61          * Pattern which spells "sigrok" using '0's (with '1's as "background")
62          * when displayed using the 'bits' output format.
63          */
64         PATTERN_SIGROK,
65
66         /** Pattern which consists of (pseudo-)random values on all probes. */
67         PATTERN_RANDOM,
68
69         /**
70          * Pattern which consists of incrementing numbers.
71          * TODO: Better description.
72          */
73         PATTERN_INC,
74
75         /** Pattern where all probes have a low logic state. */
76         PATTERN_ALL_LOW,
77
78         /** Pattern where all probes have a high logic state. */
79         PATTERN_ALL_HIGH,
80 };
81
82 /* Private, per-device-instance driver context. */
83 struct dev_context {
84         struct sr_dev_inst *sdi;
85         int pipe_fds[2];
86         GIOChannel *channel;
87         uint64_t cur_samplerate;
88         uint64_t limit_samples;
89         uint64_t limit_msec;
90         uint8_t sample_generator;
91         uint64_t samples_counter;
92         void *cb_data;
93         int64_t starttime;
94 };
95
96 static const int hwcaps[] = {
97         SR_CONF_LOGIC_ANALYZER,
98         SR_CONF_DEMO_DEV,
99         SR_CONF_SAMPLERATE,
100         SR_CONF_PATTERN_MODE,
101         SR_CONF_LIMIT_SAMPLES,
102         SR_CONF_LIMIT_MSEC,
103         SR_CONF_CONTINUOUS,
104 };
105
106 static const uint64_t samplerates[] = {
107         SR_HZ(1),
108         SR_GHZ(1),
109         SR_HZ(1),
110 };
111
112 static const char *pattern_strings[] = {
113         "sigrok",
114         "random",
115         "incremental",
116         "all-low",
117         "all-high",
118 };
119
120 /* We name the probes 0-7 on our demo driver. */
121 static const char *probe_names[NUM_PROBES + 1] = {
122         "0", "1", "2", "3", "4", "5", "6", "7",
123         NULL,
124 };
125
126 static uint8_t pattern_sigrok[] = {
127         0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
128         0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
129         0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
130         0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
131         0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
132         0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
133         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
134         0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
135 };
136
137 /* Private, per-device-instance driver context. */
138 /* TODO: struct context as with the other drivers. */
139
140 /* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
141 SR_PRIV struct sr_dev_driver demo_driver_info;
142 static struct sr_dev_driver *di = &demo_driver_info;
143
144 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
145
146 static int clear_instances(void)
147 {
148         /* Nothing needed so far. */
149
150         return SR_OK;
151 }
152
153 static int hw_init(struct sr_context *sr_ctx)
154 {
155         return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
156 }
157
158 static GSList *hw_scan(GSList *options)
159 {
160         struct sr_dev_inst *sdi;
161         struct sr_probe *probe;
162         struct drv_context *drvc;
163         struct dev_context *devc;
164         GSList *devices;
165         int i;
166
167         (void)options;
168
169         drvc = di->priv;
170
171         devices = NULL;
172
173         sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
174         if (!sdi) {
175                 sr_err("%s: sr_dev_inst_new failed", __func__);
176                 return 0;
177         }
178         sdi->driver = di;
179
180         for (i = 0; probe_names[i]; i++) {
181                 if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
182                                 probe_names[i])))
183                         return NULL;
184                 sdi->probes = g_slist_append(sdi->probes, probe);
185         }
186
187         devices = g_slist_append(devices, sdi);
188         drvc->instances = g_slist_append(drvc->instances, sdi);
189
190         /* TODO: 'devc' is never g_free()'d? */
191         if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
192                 sr_err("%s: devc malloc failed", __func__);
193                 return SR_ERR_MALLOC;
194         }
195
196         devc->sdi = sdi;
197         devc->cur_samplerate = SR_KHZ(200);
198         devc->limit_samples = 0;
199         devc->limit_msec = 0;
200         devc->sample_generator = PATTERN_SIGROK;
201
202         sdi->priv = devc;
203
204         return devices;
205 }
206
207 static GSList *hw_dev_list(void)
208 {
209         return ((struct drv_context *)(di->priv))->instances;
210 }
211
212 static int hw_dev_open(struct sr_dev_inst *sdi)
213 {
214         (void)sdi;
215
216         /* Nothing needed so far. */
217
218         return SR_OK;
219 }
220
221 static int hw_dev_close(struct sr_dev_inst *sdi)
222 {
223         (void)sdi;
224
225         /* Nothing needed so far. */
226
227         return SR_OK;
228 }
229
230 static int hw_cleanup(void)
231 {
232         /* Nothing needed so far. */
233         return SR_OK;
234 }
235
236 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
237 {
238         struct dev_context *const devc = sdi->priv;
239
240         switch (id) {
241         case SR_CONF_SAMPLERATE:
242                 *data = g_variant_new_uint64(devc->cur_samplerate);
243                 break;
244         case SR_CONF_LIMIT_SAMPLES:
245                 *data = g_variant_new_uint64(devc->limit_samples);
246                 break;
247         case SR_CONF_LIMIT_MSEC:
248                 *data = g_variant_new_uint64(devc->limit_msec);
249                 break;
250         case SR_CONF_PATTERN_MODE:
251                 switch (devc->sample_generator) {
252                 case PATTERN_SIGROK:
253                         *data = g_variant_new_string(STR_PATTERN_SIGROK);
254                         break;
255                 case PATTERN_RANDOM:
256                         *data = g_variant_new_string(STR_PATTERN_RANDOM);
257                         break;
258                 case PATTERN_INC:
259                         *data = g_variant_new_string(STR_PATTERN_INC);
260                         break;
261                 case PATTERN_ALL_LOW:
262                         *data = g_variant_new_string(STR_PATTERN_ALL_LOW);
263                         break;
264                 case PATTERN_ALL_HIGH:
265                         *data = g_variant_new_string(STR_PATTERN_ALL_HIGH);
266                         break;
267                 }
268                 break;
269         default:
270                 return SR_ERR_ARG;
271         }
272
273         return SR_OK;
274 }
275
276 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
277 {
278         int ret;
279         const char *stropt;
280
281         struct dev_context *const devc = sdi->priv;
282
283         if (id == SR_CONF_SAMPLERATE) {
284                 devc->cur_samplerate = g_variant_get_uint64(data);
285                 sr_dbg("%s: setting samplerate to %" PRIu64, __func__,
286                        devc->cur_samplerate);
287                 ret = SR_OK;
288         } else if (id == SR_CONF_LIMIT_SAMPLES) {
289                 devc->limit_msec = 0;
290                 devc->limit_samples = g_variant_get_uint64(data);
291                 sr_dbg("%s: setting limit_samples to %" PRIu64, __func__,
292                        devc->limit_samples);
293                 ret = SR_OK;
294         } else if (id == SR_CONF_LIMIT_MSEC) {
295                 devc->limit_msec = g_variant_get_uint64(data);
296                 devc->limit_samples = 0;
297                 sr_dbg("%s: setting limit_msec to %" PRIu64, __func__,
298                        devc->limit_msec);
299                 ret = SR_OK;
300         } else if (id == SR_CONF_PATTERN_MODE) {
301                 stropt = g_variant_get_string(data, NULL);
302                 ret = SR_OK;
303                 if (!strcmp(stropt, STR_PATTERN_SIGROK)) {
304                         devc->sample_generator = PATTERN_SIGROK;
305                 } else if (!strcmp(stropt, STR_PATTERN_RANDOM)) {
306                         devc->sample_generator = PATTERN_RANDOM;
307                 } else if (!strcmp(stropt, STR_PATTERN_INC)) {
308                         devc->sample_generator = PATTERN_INC;
309                 } else if (!strcmp(stropt, STR_PATTERN_ALL_LOW)) {
310                         devc->sample_generator = PATTERN_ALL_LOW;
311                 } else if (!strcmp(stropt, STR_PATTERN_ALL_HIGH)) {
312                         devc->sample_generator = PATTERN_ALL_HIGH;
313                 } else {
314                         ret = SR_ERR;
315                 }
316                 sr_dbg("%s: setting pattern to %d",
317                         __func__, devc->sample_generator);
318         } else {
319                 ret = SR_ERR;
320         }
321
322         return ret;
323 }
324
325 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
326 {
327         GVariant *gvar;
328         GVariantBuilder gvb;
329
330         (void)sdi;
331
332         switch (key) {
333         case SR_CONF_DEVICE_OPTIONS:
334                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
335                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
336                 break;
337         case SR_CONF_SAMPLERATE:
338                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
339                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
340                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
341                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
342                 *data = g_variant_builder_end(&gvb);
343                 break;
344         case SR_CONF_PATTERN_MODE:
345                 *data = g_variant_new_strv(pattern_strings, ARRAY_SIZE(pattern_strings));
346                 break;
347         default:
348                 return SR_ERR_ARG;
349         }
350
351         return SR_OK;
352 }
353
354 static void samples_generator(uint8_t *buf, uint64_t size,
355                               struct dev_context *devc)
356 {
357         static uint64_t p = 0;
358         uint64_t i;
359
360         /* TODO: Needed? */
361         memset(buf, 0, size);
362
363         switch (devc->sample_generator) {
364         case PATTERN_SIGROK: /* sigrok pattern */
365                 for (i = 0; i < size; i++) {
366                         *(buf + i) = ~(pattern_sigrok[
367                                 p++ % sizeof(pattern_sigrok)] >> 1);
368                 }
369                 break;
370         case PATTERN_RANDOM: /* Random */
371                 for (i = 0; i < size; i++)
372                         *(buf + i) = (uint8_t)(rand() & 0xff);
373                 break;
374         case PATTERN_INC: /* Simple increment */
375                 for (i = 0; i < size; i++)
376                         *(buf + i) = p++;
377                 break;
378         case PATTERN_ALL_LOW: /* All probes are low */
379                 memset(buf, 0x00, size);
380                 break;
381         case PATTERN_ALL_HIGH: /* All probes are high */
382                 memset(buf, 0xff, size);
383                 break;
384         default:
385                 sr_err("Unknown pattern: %d.", devc->sample_generator);
386                 break;
387         }
388 }
389
390 /* Callback handling data */
391 static int receive_data(int fd, int revents, void *cb_data)
392 {
393         struct dev_context *devc = cb_data;
394         struct sr_datafeed_packet packet;
395         struct sr_datafeed_logic logic;
396         uint8_t buf[BUFSIZE];
397         static uint64_t samples_to_send, expected_samplenum, sending_now;
398         int64_t time, elapsed;
399
400         (void)fd;
401         (void)revents;
402
403         /* How many "virtual" samples should we have collected by now? */
404         time = g_get_monotonic_time();
405         elapsed = time - devc->starttime;
406         expected_samplenum = elapsed * devc->cur_samplerate / 1000000;
407         /* Of those, how many do we still have to send? */
408         samples_to_send = expected_samplenum - devc->samples_counter;
409
410         if (devc->limit_samples) {
411                 samples_to_send = MIN(samples_to_send,
412                                  devc->limit_samples - devc->samples_counter);
413         }
414
415         while (samples_to_send > 0) {
416                 sending_now = MIN(samples_to_send, sizeof(buf));
417                 samples_to_send -= sending_now;
418                 samples_generator(buf, sending_now, devc);
419
420                 packet.type = SR_DF_LOGIC;
421                 packet.payload = &logic;
422                 logic.length = sending_now;
423                 logic.unitsize = 1;
424                 logic.data = buf;
425                 sr_session_send(devc->cb_data, &packet);
426                 devc->samples_counter += sending_now;
427         }
428
429         if (devc->limit_samples &&
430                 devc->samples_counter >= devc->limit_samples) {
431                 sr_info("Requested number of samples reached.");
432                 hw_dev_acquisition_stop(devc->sdi, cb_data);
433                 return TRUE;
434         }
435
436         return TRUE;
437 }
438
439 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
440                 void *cb_data)
441 {
442         struct dev_context *const devc = sdi->priv;
443
444         devc->cb_data = cb_data;
445         devc->samples_counter = 0;
446
447         /*
448          * Setting two channels connected by a pipe is a remnant from when the
449          * demo driver generated data in a thread, and collected and sent the
450          * data in the main program loop.
451          * They are kept here because it provides a convenient way of setting
452          * up a timeout-based polling mechanism.
453          */
454         if (pipe(devc->pipe_fds)) {
455                 /* TODO: Better error message. */
456                 sr_err("%s: pipe() failed", __func__);
457                 return SR_ERR;
458         }
459
460         devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
461
462         g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
463
464         /* Set channel encoding to binary (default is UTF-8). */
465         g_io_channel_set_encoding(devc->channel, NULL, NULL);
466
467         /* Make channels to unbuffered. */
468         g_io_channel_set_buffered(devc->channel, FALSE);
469
470         sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR,
471                     40, receive_data, devc);
472
473         /* Send header packet to the session bus. */
474         std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
475
476         /* We use this timestamp to decide how many more samples to send. */
477         devc->starttime = g_get_monotonic_time();
478
479         return SR_OK;
480 }
481
482 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
483 {
484         struct dev_context *const devc = sdi->priv;
485         struct sr_datafeed_packet packet;
486
487         (void)cb_data;
488
489         sr_dbg("Stopping aquisition.");
490
491         sr_session_source_remove_channel(devc->channel);
492         g_io_channel_shutdown(devc->channel, FALSE, NULL);
493
494         /* Send last packet. */
495         packet.type = SR_DF_END;
496         sr_session_send(devc->cb_data, &packet);
497
498         return SR_OK;
499 }
500
501 SR_PRIV struct sr_dev_driver demo_driver_info = {
502         .name = "demo",
503         .longname = "Demo driver and pattern generator",
504         .api_version = 1,
505         .init = hw_init,
506         .cleanup = hw_cleanup,
507         .scan = hw_scan,
508         .dev_list = hw_dev_list,
509         .dev_clear = clear_instances,
510         .config_get = config_get,
511         .config_set = config_set,
512         .config_list = config_list,
513         .dev_open = hw_dev_open,
514         .dev_close = hw_dev_close,
515         .dev_acquisition_start = hw_dev_acquisition_start,
516         .dev_acquisition_stop = hw_dev_acquisition_stop,
517         .priv = NULL,
518 };