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1 | /* | |
2 | * This file is part of the libsigrok 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 | #define LOG_PREFIX "demo" | |
35 | ||
36 | #define DEFAULT_NUM_LOGIC_PROBES 8 | |
37 | #define DEFAULT_NUM_ANALOG_PROBES 4 | |
38 | ||
39 | /* The size in bytes of chunks to send through the session bus. */ | |
40 | #define LOGIC_BUFSIZE 4096 | |
41 | /* Size of the analog pattern space per channel. */ | |
42 | #define ANALOG_BUFSIZE 4096 | |
43 | ||
44 | /* Patterns we can generate */ | |
45 | enum { | |
46 | /* Logic */ | |
47 | /** | |
48 | * Spells "sigrok" across 8 probes using '0's (with '1's as | |
49 | * "background") when displayed using the 'bits' output format. | |
50 | * The pattern is repeasted every 8 probes, shifted to the right | |
51 | * in time by one bit. | |
52 | */ | |
53 | PATTERN_SIGROK, | |
54 | ||
55 | /** Pseudo-random values on all probes. */ | |
56 | PATTERN_RANDOM, | |
57 | ||
58 | /** | |
59 | * Incrementing number across 8 probes. The pattern is repeasted | |
60 | * every 8 probes, shifted to the right in time by one bit. | |
61 | */ | |
62 | PATTERN_INC, | |
63 | ||
64 | /** All probes have a low logic state. */ | |
65 | PATTERN_ALL_LOW, | |
66 | ||
67 | /** All probes have a high logic state. */ | |
68 | PATTERN_ALL_HIGH, | |
69 | ||
70 | /* Analog */ | |
71 | /** | |
72 | * Square wave. | |
73 | */ | |
74 | PATTERN_SQUARE, | |
75 | }; | |
76 | ||
77 | static const char *logic_pattern_str[] = { | |
78 | "sigrok", | |
79 | "random", | |
80 | "incremental", | |
81 | "all-low", | |
82 | "all-high", | |
83 | }; | |
84 | ||
85 | static const char *analog_pattern_str[] = { | |
86 | "square", | |
87 | }; | |
88 | ||
89 | struct analog_gen { | |
90 | int pattern; | |
91 | float pattern_data[ANALOG_BUFSIZE]; | |
92 | unsigned int num_samples; | |
93 | struct sr_datafeed_analog packet; | |
94 | }; | |
95 | ||
96 | /* Private, per-device-instance driver context. */ | |
97 | struct dev_context { | |
98 | int pipe_fds[2]; | |
99 | GIOChannel *channel; | |
100 | uint64_t cur_samplerate; | |
101 | uint64_t limit_samples; | |
102 | uint64_t limit_msec; | |
103 | uint64_t samples_counter; | |
104 | int64_t starttime; | |
105 | uint64_t step; | |
106 | /* Logic */ | |
107 | int32_t num_logic_probes; | |
108 | unsigned int logic_unitsize; | |
109 | uint8_t logic_pattern; | |
110 | unsigned char logic_data[LOGIC_BUFSIZE]; | |
111 | /* Analog */ | |
112 | int32_t num_analog_probes; | |
113 | GSList *analog_probe_groups; | |
114 | }; | |
115 | ||
116 | static const int32_t hwopts[] = { | |
117 | SR_CONF_NUM_LOGIC_PROBES, | |
118 | SR_CONF_NUM_ANALOG_PROBES, | |
119 | }; | |
120 | ||
121 | static const int hwcaps[] = { | |
122 | SR_CONF_LOGIC_ANALYZER, | |
123 | SR_CONF_DEMO_DEV, | |
124 | SR_CONF_SAMPLERATE, | |
125 | SR_CONF_PATTERN_MODE, | |
126 | SR_CONF_LIMIT_SAMPLES, | |
127 | SR_CONF_LIMIT_MSEC, | |
128 | }; | |
129 | ||
130 | static const uint64_t samplerates[] = { | |
131 | SR_HZ(1), | |
132 | SR_GHZ(1), | |
133 | SR_HZ(1), | |
134 | }; | |
135 | ||
136 | static uint8_t pattern_sigrok[] = { | |
137 | 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00, | |
138 | 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00, | |
139 | 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00, | |
140 | 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00, | |
141 | 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00, | |
142 | 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00, | |
143 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
144 | 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
145 | }; | |
146 | ||
147 | SR_PRIV struct sr_dev_driver demo_driver_info; | |
148 | static struct sr_dev_driver *di = &demo_driver_info; | |
149 | ||
150 | static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data); | |
151 | ||
152 | ||
153 | static int dev_clear(void) | |
154 | { | |
155 | return std_dev_clear(di, NULL); | |
156 | } | |
157 | ||
158 | static int init(struct sr_context *sr_ctx) | |
159 | { | |
160 | return std_init(sr_ctx, di, LOG_PREFIX); | |
161 | } | |
162 | ||
163 | static void set_analog_pattern(const struct sr_probe_group *probe_group, int pattern) | |
164 | { | |
165 | struct analog_gen *ag; | |
166 | float value; | |
167 | unsigned int num_samples, i; | |
168 | int last_end; | |
169 | ||
170 | ag = probe_group->priv; | |
171 | ag->pattern = pattern; | |
172 | ||
173 | switch (pattern) { | |
174 | case PATTERN_SQUARE: | |
175 | num_samples = ANALOG_BUFSIZE / sizeof(float); | |
176 | value = 5.0; | |
177 | last_end = 0; | |
178 | for (i = 0; i < num_samples; i++) { | |
179 | if (i % 5 == 0) | |
180 | value = -value; | |
181 | if (i % 10 == 0) | |
182 | last_end = i - 1; | |
183 | ag->pattern_data[i] = value; | |
184 | } | |
185 | ag->num_samples = last_end; | |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
190 | static GSList *scan(GSList *options) | |
191 | { | |
192 | struct drv_context *drvc; | |
193 | struct dev_context *devc; | |
194 | struct sr_dev_inst *sdi; | |
195 | struct sr_probe *probe; | |
196 | struct sr_probe_group *pg; | |
197 | struct sr_config *src; | |
198 | struct analog_gen *ag; | |
199 | GSList *devices, *l; | |
200 | int num_logic_probes, num_analog_probes, i; | |
201 | char probe_name[16]; | |
202 | ||
203 | drvc = di->priv; | |
204 | ||
205 | num_logic_probes = DEFAULT_NUM_LOGIC_PROBES; | |
206 | num_analog_probes = DEFAULT_NUM_ANALOG_PROBES; | |
207 | for (l = options; l; l = l->next) { | |
208 | src = l->data; | |
209 | switch (src->key) { | |
210 | case SR_CONF_NUM_LOGIC_PROBES: | |
211 | num_logic_probes = g_variant_get_int32(src->data); | |
212 | break; | |
213 | case SR_CONF_NUM_ANALOG_PROBES: | |
214 | num_analog_probes = g_variant_get_int32(src->data); | |
215 | break; | |
216 | } | |
217 | } | |
218 | ||
219 | devices = NULL; | |
220 | sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "Demo device", NULL, NULL); | |
221 | if (!sdi) { | |
222 | sr_err("Device instance creation failed."); | |
223 | return NULL; | |
224 | } | |
225 | sdi->driver = di; | |
226 | ||
227 | if (!(devc = g_try_malloc(sizeof(struct dev_context)))) { | |
228 | sr_err("Device context malloc failed."); | |
229 | return NULL; | |
230 | } | |
231 | devc->cur_samplerate = SR_KHZ(200); | |
232 | devc->limit_samples = 0; | |
233 | devc->limit_msec = 0; | |
234 | devc->step = 0; | |
235 | devc->num_logic_probes = num_logic_probes; | |
236 | devc->logic_unitsize = (devc->num_logic_probes + 7) / 8; | |
237 | devc->logic_pattern = PATTERN_SIGROK; | |
238 | devc->num_analog_probes = num_analog_probes; | |
239 | devc->analog_probe_groups = NULL; | |
240 | ||
241 | /* Logic probes, all in one probe group. */ | |
242 | if (!(pg = g_try_malloc(sizeof(struct sr_probe_group)))) | |
243 | return NULL; | |
244 | pg->name = g_strdup("Logic"); | |
245 | pg->probes = NULL; | |
246 | pg->priv = NULL; | |
247 | for (i = 0; i < num_logic_probes; i++) { | |
248 | sprintf(probe_name, "D%d", i); | |
249 | if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE, probe_name))) | |
250 | return NULL; | |
251 | sdi->probes = g_slist_append(sdi->probes, probe); | |
252 | pg->probes = g_slist_append(pg->probes, probe); | |
253 | } | |
254 | sdi->probe_groups = g_slist_append(NULL, pg); | |
255 | ||
256 | /* Analog probes, probe groups and pattern generators. */ | |
257 | for (i = 0; i < num_analog_probes; i++) { | |
258 | sprintf(probe_name, "A%d", i); | |
259 | if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE, probe_name))) | |
260 | return NULL; | |
261 | sdi->probes = g_slist_append(sdi->probes, probe); | |
262 | ||
263 | /* Every analog probe gets its own probe group. */ | |
264 | if (!(pg = g_try_malloc(sizeof(struct sr_probe_group)))) | |
265 | return NULL; | |
266 | pg->name = g_strdup(probe_name); | |
267 | pg->probes = g_slist_append(NULL, probe); | |
268 | ||
269 | /* Every probe group gets a generator struct. */ | |
270 | if (!(ag = g_try_malloc(sizeof(struct analog_gen)))) | |
271 | return NULL; | |
272 | ag->packet.probes = pg->probes; | |
273 | ag->packet.mq = 0; | |
274 | ag->packet.mqflags = 0; | |
275 | ag->packet.unit = SR_UNIT_VOLT; | |
276 | ag->packet.data = ag->pattern_data; | |
277 | pg->priv = ag; | |
278 | set_analog_pattern(pg, PATTERN_SQUARE); | |
279 | ||
280 | sdi->probe_groups = g_slist_append(sdi->probe_groups, pg); | |
281 | devc->analog_probe_groups = g_slist_append(devc->analog_probe_groups, pg); | |
282 | } | |
283 | ||
284 | sdi->priv = devc; | |
285 | devices = g_slist_append(devices, sdi); | |
286 | drvc->instances = g_slist_append(drvc->instances, sdi); | |
287 | ||
288 | return devices; | |
289 | } | |
290 | ||
291 | static GSList *dev_list(void) | |
292 | { | |
293 | return ((struct drv_context *)(di->priv))->instances; | |
294 | } | |
295 | ||
296 | static int dev_open(struct sr_dev_inst *sdi) | |
297 | { | |
298 | sdi->status = SR_ST_ACTIVE; | |
299 | ||
300 | return SR_OK; | |
301 | } | |
302 | ||
303 | static int dev_close(struct sr_dev_inst *sdi) | |
304 | { | |
305 | sdi->status = SR_ST_INACTIVE; | |
306 | ||
307 | return SR_OK; | |
308 | } | |
309 | ||
310 | static int cleanup(void) | |
311 | { | |
312 | return dev_clear(); | |
313 | } | |
314 | ||
315 | static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi, | |
316 | const struct sr_probe_group *probe_group) | |
317 | { | |
318 | struct dev_context *devc; | |
319 | ||
320 | (void)probe_group; | |
321 | ||
322 | devc = sdi->priv; | |
323 | switch (id) { | |
324 | case SR_CONF_SAMPLERATE: | |
325 | *data = g_variant_new_uint64(devc->cur_samplerate); | |
326 | break; | |
327 | case SR_CONF_LIMIT_SAMPLES: | |
328 | *data = g_variant_new_uint64(devc->limit_samples); | |
329 | break; | |
330 | case SR_CONF_LIMIT_MSEC: | |
331 | *data = g_variant_new_uint64(devc->limit_msec); | |
332 | break; | |
333 | case SR_CONF_PATTERN_MODE: | |
334 | *data = g_variant_new_string(logic_pattern_str[devc->logic_pattern]); | |
335 | break; | |
336 | case SR_CONF_NUM_LOGIC_PROBES: | |
337 | *data = g_variant_new_int32(devc->num_logic_probes); | |
338 | break; | |
339 | case SR_CONF_NUM_ANALOG_PROBES: | |
340 | *data = g_variant_new_int32(devc->num_analog_probes); | |
341 | break; | |
342 | default: | |
343 | return SR_ERR_NA; | |
344 | } | |
345 | ||
346 | return SR_OK; | |
347 | } | |
348 | ||
349 | static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi, | |
350 | const struct sr_probe_group *probe_group) | |
351 | { | |
352 | struct dev_context *devc; | |
353 | struct sr_probe_group *pg; | |
354 | GSList *l; | |
355 | int logic_pattern, analog_pattern, ret; | |
356 | unsigned int i; | |
357 | const char *stropt; | |
358 | ||
359 | devc = sdi->priv; | |
360 | ||
361 | if (sdi->status != SR_ST_ACTIVE) | |
362 | return SR_ERR_DEV_CLOSED; | |
363 | ||
364 | ret = SR_ERR; | |
365 | if (id == SR_CONF_SAMPLERATE) { | |
366 | devc->cur_samplerate = g_variant_get_uint64(data); | |
367 | sr_dbg("Setting samplerate to %" PRIu64, devc->cur_samplerate); | |
368 | ret = SR_OK; | |
369 | } else if (id == SR_CONF_LIMIT_SAMPLES) { | |
370 | devc->limit_msec = 0; | |
371 | devc->limit_samples = g_variant_get_uint64(data); | |
372 | sr_dbg("Setting sample limit to %" PRIu64, devc->limit_samples); | |
373 | ret = SR_OK; | |
374 | } else if (id == SR_CONF_LIMIT_MSEC) { | |
375 | /* TODO: convert to limit_samples */ | |
376 | devc->limit_msec = g_variant_get_uint64(data); | |
377 | devc->limit_samples = 0; | |
378 | sr_dbg("Setting time limit to %" PRIu64"ms", devc->limit_msec); | |
379 | ret = SR_OK; | |
380 | } else if (id == SR_CONF_PATTERN_MODE) { | |
381 | stropt = g_variant_get_string(data, NULL); | |
382 | logic_pattern = analog_pattern = -1; | |
383 | /* Is it a logic pattern? */ | |
384 | for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) { | |
385 | if (!strcmp(stropt, logic_pattern_str[i])) { | |
386 | logic_pattern = i; | |
387 | break; | |
388 | } | |
389 | } | |
390 | if (logic_pattern == -1) { | |
391 | /* Is it an analog pattern? */ | |
392 | for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) { | |
393 | if (!strcmp(stropt, analog_pattern_str[i])) { | |
394 | analog_pattern = i; | |
395 | break; | |
396 | } | |
397 | } | |
398 | } | |
399 | if (logic_pattern > -1) { | |
400 | devc->logic_pattern = logic_pattern; | |
401 | /* Might as well do this now. */ | |
402 | if (logic_pattern == PATTERN_ALL_LOW) | |
403 | memset(devc->logic_data, 0x00, LOGIC_BUFSIZE); | |
404 | else if (logic_pattern == PATTERN_ALL_HIGH) | |
405 | memset(devc->logic_data, 0xff, LOGIC_BUFSIZE); | |
406 | ret = SR_OK; | |
407 | sr_dbg("Setting logic pattern to %s", logic_pattern_str[logic_pattern]); | |
408 | } else if (analog_pattern > -1) { | |
409 | sr_dbg("Setting analog pattern to %s", analog_pattern_str[analog_pattern]); | |
410 | if (probe_group) | |
411 | set_analog_pattern(probe_group, analog_pattern); | |
412 | else { | |
413 | /* No probe group specified, apply pattern to all of them. */ | |
414 | for (l = sdi->probe_groups; l; l = l->next) { | |
415 | pg = l->data; | |
416 | set_analog_pattern(pg, analog_pattern); | |
417 | } | |
418 | ret = SR_OK; | |
419 | } | |
420 | } else { | |
421 | ret = SR_ERR; | |
422 | } | |
423 | } else { | |
424 | ret = SR_ERR_NA; | |
425 | } | |
426 | ||
427 | return ret; | |
428 | } | |
429 | ||
430 | static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi, | |
431 | const struct sr_probe_group *probe_group) | |
432 | { | |
433 | GVariant *gvar; | |
434 | GVariantBuilder gvb; | |
435 | ||
436 | (void)sdi; | |
437 | (void)probe_group; | |
438 | ||
439 | switch (key) { | |
440 | case SR_CONF_SCAN_OPTIONS: | |
441 | *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, | |
442 | hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t)); | |
443 | break; | |
444 | case SR_CONF_DEVICE_OPTIONS: | |
445 | *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, | |
446 | hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t)); | |
447 | break; | |
448 | case SR_CONF_SAMPLERATE: | |
449 | g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}")); | |
450 | gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates, | |
451 | ARRAY_SIZE(samplerates), sizeof(uint64_t)); | |
452 | g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar); | |
453 | *data = g_variant_builder_end(&gvb); | |
454 | break; | |
455 | case SR_CONF_PATTERN_MODE: | |
456 | *data = g_variant_new_strv(logic_pattern_str, ARRAY_SIZE(logic_pattern_str)); | |
457 | break; | |
458 | default: | |
459 | return SR_ERR_NA; | |
460 | } | |
461 | ||
462 | return SR_OK; | |
463 | } | |
464 | ||
465 | static void logic_generator(struct sr_dev_inst *sdi, uint64_t size) | |
466 | { | |
467 | struct dev_context *devc; | |
468 | uint64_t i, j; | |
469 | uint8_t pat; | |
470 | ||
471 | devc = sdi->priv; | |
472 | ||
473 | switch (devc->logic_pattern) { | |
474 | case PATTERN_SIGROK: | |
475 | memset(devc->logic_data, 0x00, size); | |
476 | for (i = 0; i < size; i += devc->logic_unitsize) { | |
477 | for (j = 0; j < devc->logic_unitsize; j++) { | |
478 | pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1; | |
479 | devc->logic_data[i + j] = ~pat; | |
480 | } | |
481 | devc->step++; | |
482 | } | |
483 | break; | |
484 | case PATTERN_RANDOM: | |
485 | for (i = 0; i < size; i++) | |
486 | devc->logic_data[i] = (uint8_t)(rand() & 0xff); | |
487 | break; | |
488 | case PATTERN_INC: | |
489 | for (i = 0; i < size; i++) { | |
490 | for (j = 0; j < devc->logic_unitsize; j++) { | |
491 | devc->logic_data[i + j] = devc->step; | |
492 | } | |
493 | devc->step++; | |
494 | } | |
495 | break; | |
496 | case PATTERN_ALL_LOW: | |
497 | case PATTERN_ALL_HIGH: | |
498 | /* These were set when the pattern mode was selected. */ | |
499 | break; | |
500 | default: | |
501 | sr_err("Unknown pattern: %d.", devc->logic_pattern); | |
502 | break; | |
503 | } | |
504 | } | |
505 | ||
506 | /* Callback handling data */ | |
507 | static int prepare_data(int fd, int revents, void *cb_data) | |
508 | { | |
509 | struct sr_dev_inst *sdi; | |
510 | struct dev_context *devc; | |
511 | struct sr_datafeed_packet packet; | |
512 | struct sr_datafeed_logic logic; | |
513 | struct sr_probe_group *pg; | |
514 | struct analog_gen *ag; | |
515 | GSList *l; | |
516 | uint64_t samples_to_send, expected_samplenum, analog_samples, sending_now; | |
517 | int64_t time, elapsed; | |
518 | ||
519 | (void)fd; | |
520 | (void)revents; | |
521 | ||
522 | sdi = cb_data; | |
523 | devc = sdi->priv; | |
524 | ||
525 | /* How many "virtual" samples should we have collected by now? */ | |
526 | time = g_get_monotonic_time(); | |
527 | elapsed = time - devc->starttime; | |
528 | expected_samplenum = elapsed * devc->cur_samplerate / 1000000; | |
529 | /* Of those, how many do we still have to send? */ | |
530 | samples_to_send = expected_samplenum - devc->samples_counter; | |
531 | ||
532 | if (devc->limit_samples) { | |
533 | samples_to_send = MIN(samples_to_send, | |
534 | devc->limit_samples - devc->samples_counter); | |
535 | } | |
536 | ||
537 | while (samples_to_send > 0) { | |
538 | sending_now = 0; | |
539 | ||
540 | /* Logic */ | |
541 | if (devc->num_logic_probes > 0) { | |
542 | sending_now = MIN(samples_to_send, | |
543 | LOGIC_BUFSIZE / devc->logic_unitsize); | |
544 | logic_generator(sdi, sending_now * devc->logic_unitsize); | |
545 | packet.type = SR_DF_LOGIC; | |
546 | packet.payload = &logic; | |
547 | logic.length = sending_now * devc->logic_unitsize; | |
548 | logic.unitsize = devc->logic_unitsize; | |
549 | logic.data = devc->logic_data; | |
550 | sr_session_send(sdi, &packet); | |
551 | } | |
552 | ||
553 | /* Analog, one probe at a time */ | |
554 | if (devc->num_analog_probes > 0) { | |
555 | sending_now = 0; | |
556 | for (l = devc->analog_probe_groups; l; l = l->next) { | |
557 | pg = l->data; | |
558 | ag = pg->priv; | |
559 | packet.type = SR_DF_ANALOG; | |
560 | packet.payload = &ag->packet; | |
561 | analog_samples = MIN(samples_to_send, ag->num_samples); | |
562 | /* Whichever probe group gets there first. */ | |
563 | sending_now = MAX(sending_now, analog_samples); | |
564 | ag->packet.num_samples = analog_samples; | |
565 | sr_session_send(sdi, &packet); | |
566 | } | |
567 | } | |
568 | ||
569 | samples_to_send -= sending_now; | |
570 | devc->samples_counter += sending_now; | |
571 | } | |
572 | ||
573 | if (devc->limit_samples && | |
574 | devc->samples_counter >= devc->limit_samples) { | |
575 | sr_info("Requested number of samples reached."); | |
576 | dev_acquisition_stop(sdi, cb_data); | |
577 | return TRUE; | |
578 | } | |
579 | ||
580 | return TRUE; | |
581 | } | |
582 | ||
583 | static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) | |
584 | { | |
585 | struct dev_context *devc; | |
586 | ||
587 | if (sdi->status != SR_ST_ACTIVE) | |
588 | return SR_ERR_DEV_CLOSED; | |
589 | ||
590 | /* TODO: don't start without a sample limit set */ | |
591 | devc = sdi->priv; | |
592 | devc->samples_counter = 0; | |
593 | ||
594 | /* | |
595 | * Setting two channels connected by a pipe is a remnant from when the | |
596 | * demo driver generated data in a thread, and collected and sent the | |
597 | * data in the main program loop. | |
598 | * They are kept here because it provides a convenient way of setting | |
599 | * up a timeout-based polling mechanism. | |
600 | */ | |
601 | if (pipe(devc->pipe_fds)) { | |
602 | sr_err("%s: pipe() failed", __func__); | |
603 | return SR_ERR; | |
604 | } | |
605 | ||
606 | devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]); | |
607 | ||
608 | g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL); | |
609 | ||
610 | /* Set channel encoding to binary (default is UTF-8). */ | |
611 | g_io_channel_set_encoding(devc->channel, NULL, NULL); | |
612 | ||
613 | /* Make channels to unbuffered. */ | |
614 | g_io_channel_set_buffered(devc->channel, FALSE); | |
615 | ||
616 | sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR, | |
617 | 40, prepare_data, (void *)sdi); | |
618 | ||
619 | /* Send header packet to the session bus. */ | |
620 | std_session_send_df_header(cb_data, LOG_PREFIX); | |
621 | ||
622 | /* We use this timestamp to decide how many more samples to send. */ | |
623 | devc->starttime = g_get_monotonic_time(); | |
624 | ||
625 | return SR_OK; | |
626 | } | |
627 | ||
628 | static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) | |
629 | { | |
630 | struct dev_context *devc; | |
631 | struct sr_datafeed_packet packet; | |
632 | ||
633 | (void)cb_data; | |
634 | ||
635 | devc = sdi->priv; | |
636 | sr_dbg("Stopping aquisition."); | |
637 | ||
638 | sr_session_source_remove_channel(devc->channel); | |
639 | g_io_channel_shutdown(devc->channel, FALSE, NULL); | |
640 | g_io_channel_unref(devc->channel); | |
641 | devc->channel = NULL; | |
642 | ||
643 | /* Send last packet. */ | |
644 | packet.type = SR_DF_END; | |
645 | sr_session_send(sdi, &packet); | |
646 | ||
647 | return SR_OK; | |
648 | } | |
649 | ||
650 | SR_PRIV struct sr_dev_driver demo_driver_info = { | |
651 | .name = "demo", | |
652 | .longname = "Demo driver and pattern generator", | |
653 | .api_version = 1, | |
654 | .init = init, | |
655 | .cleanup = cleanup, | |
656 | .scan = scan, | |
657 | .dev_list = dev_list, | |
658 | .dev_clear = dev_clear, | |
659 | .config_get = config_get, | |
660 | .config_set = config_set, | |
661 | .config_list = config_list, | |
662 | .dev_open = dev_open, | |
663 | .dev_close = dev_close, | |
664 | .dev_acquisition_start = dev_acquisition_start, | |
665 | .dev_acquisition_stop = dev_acquisition_stop, | |
666 | .priv = NULL, | |
667 | }; |