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demo: sync get/set options
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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         int pipe_fds[2];
85         GIOChannel *channels[2];
86         uint8_t sample_generator;
87         uint64_t samples_counter;
88         void *cb_data;
89         int64_t starttime;
90 };
91
92 static const int hwcaps[] = {
93         SR_CONF_LOGIC_ANALYZER,
94         SR_CONF_DEMO_DEV,
95         SR_CONF_SAMPLERATE,
96         SR_CONF_PATTERN_MODE,
97         SR_CONF_LIMIT_SAMPLES,
98         SR_CONF_LIMIT_MSEC,
99         SR_CONF_CONTINUOUS,
100 };
101
102 static const struct sr_samplerates samplerates = {
103         .low  = SR_HZ(1),
104         .high = SR_GHZ(1),
105         .step = SR_HZ(1),
106         .list = NULL,
107 };
108
109 static const char *pattern_strings[] = {
110         "sigrok",
111         "random",
112         "incremental",
113         "all-low",
114         "all-high",
115         NULL,
116 };
117
118 /* We name the probes 0-7 on our demo driver. */
119 static const char *probe_names[NUM_PROBES + 1] = {
120         "0", "1", "2", "3", "4", "5", "6", "7",
121         NULL,
122 };
123
124 static uint8_t pattern_sigrok[] = {
125         0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
126         0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
127         0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
128         0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
129         0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
130         0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
131         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
132         0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
133 };
134
135 /* Private, per-device-instance driver context. */
136 /* TODO: struct context as with the other drivers. */
137
138 /* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
139 SR_PRIV struct sr_dev_driver demo_driver_info;
140 static struct sr_dev_driver *di = &demo_driver_info;
141 static uint64_t cur_samplerate = SR_KHZ(200);
142 static uint64_t limit_samples = 0;
143 static uint64_t limit_msec = 0;
144 static int default_pattern = PATTERN_SIGROK;
145
146 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
147
148 static int clear_instances(void)
149 {
150         /* Nothing needed so far. */
151
152         return SR_OK;
153 }
154
155 static int hw_init(struct sr_context *sr_ctx)
156 {
157         return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
158 }
159
160 static GSList *hw_scan(GSList *options)
161 {
162         struct sr_dev_inst *sdi;
163         struct sr_probe *probe;
164         struct drv_context *drvc;
165         GSList *devices;
166         int i;
167
168         (void)options;
169
170         drvc = di->priv;
171
172         devices = NULL;
173
174         sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
175         if (!sdi) {
176                 sr_err("%s: sr_dev_inst_new failed", __func__);
177                 return 0;
178         }
179         sdi->driver = di;
180
181         for (i = 0; probe_names[i]; i++) {
182                 if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
183                                 probe_names[i])))
184                         return NULL;
185                 sdi->probes = g_slist_append(sdi->probes, probe);
186         }
187
188         devices = g_slist_append(devices, sdi);
189         drvc->instances = g_slist_append(drvc->instances, sdi);
190
191         return devices;
192 }
193
194 static GSList *hw_dev_list(void)
195 {
196         return ((struct drv_context *)(di->priv))->instances;
197 }
198
199 static int hw_dev_open(struct sr_dev_inst *sdi)
200 {
201         (void)sdi;
202
203         /* Nothing needed so far. */
204
205         return SR_OK;
206 }
207
208 static int hw_dev_close(struct sr_dev_inst *sdi)
209 {
210         (void)sdi;
211
212         /* Nothing needed so far. */
213
214         return SR_OK;
215 }
216
217 static int hw_cleanup(void)
218 {
219         /* Nothing needed so far. */
220         return SR_OK;
221 }
222
223 static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
224 {
225         (void)sdi;
226
227         switch (id) {
228         case SR_CONF_SAMPLERATE:
229                 *data = &cur_samplerate;
230                 break;
231         case SR_CONF_LIMIT_SAMPLES:
232                 *data = &limit_samples;
233                 break;
234         case SR_CONF_LIMIT_MSEC:
235                 *data = &limit_msec;
236                 break;
237         case SR_CONF_PATTERN_MODE:
238                 switch (default_pattern) {
239                 case PATTERN_SIGROK:
240                         *data = STR_PATTERN_SIGROK;
241                         break;
242                 case PATTERN_RANDOM:
243                         *data = STR_PATTERN_RANDOM;
244                         break;
245                 case PATTERN_INC:
246                         *data = STR_PATTERN_INC;
247                         break;
248                 case PATTERN_ALL_LOW:
249                         *data = STR_PATTERN_ALL_LOW;
250                         break;
251                 case PATTERN_ALL_HIGH:
252                         *data = STR_PATTERN_ALL_HIGH;
253                         break;
254                 }
255                 break;
256         default:
257                 return SR_ERR_ARG;
258         }
259
260         return SR_OK;
261 }
262
263 static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
264 {
265         int ret;
266         const char *stropt;
267
268         (void)sdi;
269
270         if (id == SR_CONF_SAMPLERATE) {
271                 cur_samplerate = *(const uint64_t *)value;
272                 sr_dbg("%s: setting samplerate to %" PRIu64, __func__,
273                        cur_samplerate);
274                 ret = SR_OK;
275         } else if (id == SR_CONF_LIMIT_SAMPLES) {
276                 limit_msec = 0;
277                 limit_samples = *(const uint64_t *)value;
278                 sr_dbg("%s: setting limit_samples to %" PRIu64, __func__,
279                        limit_samples);
280                 ret = SR_OK;
281         } else if (id == SR_CONF_LIMIT_MSEC) {
282                 limit_msec = *(const uint64_t *)value;
283                 limit_samples = 0;
284                 sr_dbg("%s: setting limit_msec to %" PRIu64, __func__,
285                        limit_msec);
286                 ret = SR_OK;
287         } else if (id == SR_CONF_PATTERN_MODE) {
288                 stropt = value;
289                 ret = SR_OK;
290                 if (!strcmp(stropt, STR_PATTERN_SIGROK)) {
291                         default_pattern = PATTERN_SIGROK;
292                 } else if (!strcmp(stropt, STR_PATTERN_RANDOM)) {
293                         default_pattern = PATTERN_RANDOM;
294                 } else if (!strcmp(stropt, STR_PATTERN_INC)) {
295                         default_pattern = PATTERN_INC;
296                 } else if (!strcmp(stropt, STR_PATTERN_ALL_LOW)) {
297                         default_pattern = PATTERN_ALL_LOW;
298                 } else if (!strcmp(stropt, STR_PATTERN_ALL_HIGH)) {
299                         default_pattern = PATTERN_ALL_HIGH;
300                 } else {
301                         ret = SR_ERR;
302                 }
303                 sr_dbg("%s: setting pattern to %d", __func__, default_pattern);
304         } else {
305                 ret = SR_ERR;
306         }
307
308         return ret;
309 }
310
311 static int config_list(int key, const void **data, const struct sr_dev_inst *sdi)
312 {
313
314         (void)sdi;
315
316         switch (key) {
317         case SR_CONF_DEVICE_OPTIONS:
318                 *data = hwcaps;
319                 break;
320         case SR_CONF_SAMPLERATE:
321                 *data = &samplerates;
322                 break;
323         case SR_CONF_PATTERN_MODE:
324                 *data = &pattern_strings;
325                 break;
326         default:
327                 return SR_ERR_ARG;
328         }
329
330         return SR_OK;
331 }
332
333 static void samples_generator(uint8_t *buf, uint64_t size,
334                               struct dev_context *devc)
335 {
336         static uint64_t p = 0;
337         uint64_t i;
338
339         /* TODO: Needed? */
340         memset(buf, 0, size);
341
342         switch (devc->sample_generator) {
343         case PATTERN_SIGROK: /* sigrok pattern */
344                 for (i = 0; i < size; i++) {
345                         *(buf + i) = ~(pattern_sigrok[p] >> 1);
346                         if (++p == 64)
347                                 p = 0;
348                 }
349                 break;
350         case PATTERN_RANDOM: /* Random */
351                 for (i = 0; i < size; i++)
352                         *(buf + i) = (uint8_t)(rand() & 0xff);
353                 break;
354         case PATTERN_INC: /* Simple increment */
355                 for (i = 0; i < size; i++)
356                         *(buf + i) = i;
357                 break;
358         case PATTERN_ALL_LOW: /* All probes are low */
359                 memset(buf, 0x00, size);
360                 break;
361         case PATTERN_ALL_HIGH: /* All probes are high */
362                 memset(buf, 0xff, size);
363                 break;
364         default:
365                 sr_err("Unknown pattern: %d.", devc->sample_generator);
366                 break;
367         }
368 }
369
370 /* Callback handling data */
371 static int receive_data(int fd, int revents, void *cb_data)
372 {
373         struct dev_context *devc = cb_data;
374         struct sr_datafeed_packet packet;
375         struct sr_datafeed_logic logic;
376         uint8_t buf[BUFSIZE];
377         static uint64_t samples_to_send, expected_samplenum, sending_now;
378         int64_t time, elapsed;
379
380         (void)fd;
381         (void)revents;
382
383         /* How many "virtual" samples should we have collected by now? */
384         time = g_get_monotonic_time();
385         elapsed = time - devc->starttime;
386         expected_samplenum = elapsed * cur_samplerate / 1000000;
387         /* Of those, how many do we still have to send? */
388         samples_to_send = expected_samplenum - devc->samples_counter;
389
390         if (limit_samples) {
391                 samples_to_send = MIN(samples_to_send,
392                                  limit_samples - devc->samples_counter);
393         }
394
395         while (samples_to_send > 0) {
396                 sending_now = MIN(samples_to_send, sizeof(buf));
397                 samples_to_send -= sending_now;
398                 samples_generator(buf, sending_now, devc);
399
400                 packet.type = SR_DF_LOGIC;
401                 packet.payload = &logic;
402                 logic.length = sending_now;
403                 logic.unitsize = 1;
404                 logic.data = buf;
405                 sr_session_send(devc->cb_data, &packet);
406                 devc->samples_counter += sending_now;
407         }
408
409         if (limit_samples && devc->samples_counter >= limit_samples) {
410                 sr_info("Requested number of samples reached.");
411                 hw_dev_acquisition_stop(NULL, cb_data);
412                 return TRUE;
413         }
414
415         return TRUE;
416 }
417
418 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
419                 void *cb_data)
420 {
421         struct dev_context *devc;
422
423         (void)sdi;
424
425         /* TODO: 'devc' is never g_free()'d? */
426         if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
427                 sr_err("%s: devc malloc failed", __func__);
428                 return SR_ERR_MALLOC;
429         }
430
431         devc->sample_generator = default_pattern;
432         devc->cb_data = cb_data;
433         devc->samples_counter = 0;
434
435         /*
436          * Setting two channels connected by a pipe is a remnant from when the
437          * demo driver generated data in a thread, and collected and sent the
438          * data in the main program loop.
439          * They are kept here because it provides a convenient way of setting
440          * up a timeout-based polling mechanism.
441          */
442         if (pipe(devc->pipe_fds)) {
443                 /* TODO: Better error message. */
444                 sr_err("%s: pipe() failed", __func__);
445                 return SR_ERR;
446         }
447
448         devc->channels[0] = g_io_channel_unix_new(devc->pipe_fds[0]);
449         devc->channels[1] = g_io_channel_unix_new(devc->pipe_fds[1]);
450
451         g_io_channel_set_flags(devc->channels[0], G_IO_FLAG_NONBLOCK, NULL);
452
453         /* Set channel encoding to binary (default is UTF-8). */
454         g_io_channel_set_encoding(devc->channels[0], NULL, NULL);
455         g_io_channel_set_encoding(devc->channels[1], NULL, NULL);
456
457         /* Make channels to unbuffered. */
458         g_io_channel_set_buffered(devc->channels[0], FALSE);
459         g_io_channel_set_buffered(devc->channels[1], FALSE);
460
461         sr_session_source_add_channel(devc->channels[0], G_IO_IN | G_IO_ERR,
462                     40, receive_data, devc);
463
464         /* Send header packet to the session bus. */
465         std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
466
467         /* We use this timestamp to decide how many more samples to send. */
468         devc->starttime = g_get_monotonic_time();
469
470         return SR_OK;
471 }
472
473 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
474 {
475         struct dev_context *devc;
476         struct sr_datafeed_packet packet;
477
478         (void)sdi;
479
480         devc = cb_data;
481
482         sr_dbg("Stopping aquisition.");
483
484         sr_session_source_remove_channel(devc->channels[0]);
485         g_io_channel_shutdown(devc->channels[0], FALSE, NULL);
486
487         /* Send last packet. */
488         packet.type = SR_DF_END;
489         sr_session_send(devc->cb_data, &packet);
490
491         return SR_OK;
492 }
493
494 SR_PRIV struct sr_dev_driver demo_driver_info = {
495         .name = "demo",
496         .longname = "Demo driver and pattern generator",
497         .api_version = 1,
498         .init = hw_init,
499         .cleanup = hw_cleanup,
500         .scan = hw_scan,
501         .dev_list = hw_dev_list,
502         .dev_clear = clear_instances,
503         .config_get = config_get,
504         .config_set = config_set,
505         .config_list = config_list,
506         .dev_open = hw_dev_open,
507         .dev_close = hw_dev_close,
508         .dev_acquisition_start = hw_dev_acquisition_start,
509         .dev_acquisition_stop = hw_dev_acquisition_stop,
510         .priv = NULL,
511 };