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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 | /* Message logging helpers with subsystem-specific prefix string. */ | |
35 | #define LOG_PREFIX "demo: " | |
36 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
37 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
38 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
39 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
40 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
41 | #define sr_err(s, args...) sr_err(LOG_PREFIX 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, LOG_PREFIX); | |
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("Device instance creation failed."); | |
176 | return NULL; | |
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 | if (!(devc = g_try_malloc(sizeof(struct dev_context)))) { | |
191 | sr_err("Device context malloc failed."); | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | devc->sdi = sdi; | |
196 | devc->cur_samplerate = SR_KHZ(200); | |
197 | devc->limit_samples = 0; | |
198 | devc->limit_msec = 0; | |
199 | devc->sample_generator = PATTERN_SIGROK; | |
200 | ||
201 | sdi->priv = devc; | |
202 | ||
203 | return devices; | |
204 | } | |
205 | ||
206 | static GSList *hw_dev_list(void) | |
207 | { | |
208 | return ((struct drv_context *)(di->priv))->instances; | |
209 | } | |
210 | ||
211 | static int hw_dev_open(struct sr_dev_inst *sdi) | |
212 | { | |
213 | sdi->status = SR_ST_ACTIVE; | |
214 | ||
215 | return SR_OK; | |
216 | } | |
217 | ||
218 | static int hw_dev_close(struct sr_dev_inst *sdi) | |
219 | { | |
220 | sdi->status = SR_ST_INACTIVE; | |
221 | ||
222 | return SR_OK; | |
223 | } | |
224 | ||
225 | static int hw_cleanup(void) | |
226 | { | |
227 | GSList *l; | |
228 | struct sr_dev_inst *sdi; | |
229 | struct drv_context *drvc; | |
230 | int ret = SR_OK; | |
231 | ||
232 | if (!(drvc = di->priv)) | |
233 | return SR_OK; | |
234 | ||
235 | /* Properly close and free all devices. */ | |
236 | for (l = drvc->instances; l; l = l->next) { | |
237 | if (!(sdi = l->data)) { | |
238 | /* Log error, but continue cleaning up the rest. */ | |
239 | sr_err("%s: sdi was NULL, continuing", __func__); | |
240 | ret = SR_ERR_BUG; | |
241 | continue; | |
242 | } | |
243 | sr_dev_inst_free(sdi); | |
244 | } | |
245 | g_slist_free(drvc->instances); | |
246 | drvc->instances = NULL; | |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
251 | static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi) | |
252 | { | |
253 | struct dev_context *const devc = sdi->priv; | |
254 | ||
255 | switch (id) { | |
256 | case SR_CONF_SAMPLERATE: | |
257 | *data = g_variant_new_uint64(devc->cur_samplerate); | |
258 | break; | |
259 | case SR_CONF_LIMIT_SAMPLES: | |
260 | *data = g_variant_new_uint64(devc->limit_samples); | |
261 | break; | |
262 | case SR_CONF_LIMIT_MSEC: | |
263 | *data = g_variant_new_uint64(devc->limit_msec); | |
264 | break; | |
265 | case SR_CONF_PATTERN_MODE: | |
266 | switch (devc->sample_generator) { | |
267 | case PATTERN_SIGROK: | |
268 | *data = g_variant_new_string(STR_PATTERN_SIGROK); | |
269 | break; | |
270 | case PATTERN_RANDOM: | |
271 | *data = g_variant_new_string(STR_PATTERN_RANDOM); | |
272 | break; | |
273 | case PATTERN_INC: | |
274 | *data = g_variant_new_string(STR_PATTERN_INC); | |
275 | break; | |
276 | case PATTERN_ALL_LOW: | |
277 | *data = g_variant_new_string(STR_PATTERN_ALL_LOW); | |
278 | break; | |
279 | case PATTERN_ALL_HIGH: | |
280 | *data = g_variant_new_string(STR_PATTERN_ALL_HIGH); | |
281 | break; | |
282 | } | |
283 | break; | |
284 | default: | |
285 | return SR_ERR_NA; | |
286 | } | |
287 | ||
288 | return SR_OK; | |
289 | } | |
290 | ||
291 | static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi) | |
292 | { | |
293 | int ret; | |
294 | const char *stropt; | |
295 | ||
296 | struct dev_context *const devc = sdi->priv; | |
297 | ||
298 | if (sdi->status != SR_ST_ACTIVE) | |
299 | return SR_ERR_DEV_CLOSED; | |
300 | ||
301 | if (id == SR_CONF_SAMPLERATE) { | |
302 | devc->cur_samplerate = g_variant_get_uint64(data); | |
303 | sr_dbg("%s: setting samplerate to %" PRIu64, __func__, | |
304 | devc->cur_samplerate); | |
305 | ret = SR_OK; | |
306 | } else if (id == SR_CONF_LIMIT_SAMPLES) { | |
307 | devc->limit_msec = 0; | |
308 | devc->limit_samples = g_variant_get_uint64(data); | |
309 | sr_dbg("%s: setting limit_samples to %" PRIu64, __func__, | |
310 | devc->limit_samples); | |
311 | ret = SR_OK; | |
312 | } else if (id == SR_CONF_LIMIT_MSEC) { | |
313 | devc->limit_msec = g_variant_get_uint64(data); | |
314 | devc->limit_samples = 0; | |
315 | sr_dbg("%s: setting limit_msec to %" PRIu64, __func__, | |
316 | devc->limit_msec); | |
317 | ret = SR_OK; | |
318 | } else if (id == SR_CONF_PATTERN_MODE) { | |
319 | stropt = g_variant_get_string(data, NULL); | |
320 | ret = SR_OK; | |
321 | if (!strcmp(stropt, STR_PATTERN_SIGROK)) { | |
322 | devc->sample_generator = PATTERN_SIGROK; | |
323 | } else if (!strcmp(stropt, STR_PATTERN_RANDOM)) { | |
324 | devc->sample_generator = PATTERN_RANDOM; | |
325 | } else if (!strcmp(stropt, STR_PATTERN_INC)) { | |
326 | devc->sample_generator = PATTERN_INC; | |
327 | } else if (!strcmp(stropt, STR_PATTERN_ALL_LOW)) { | |
328 | devc->sample_generator = PATTERN_ALL_LOW; | |
329 | } else if (!strcmp(stropt, STR_PATTERN_ALL_HIGH)) { | |
330 | devc->sample_generator = PATTERN_ALL_HIGH; | |
331 | } else { | |
332 | ret = SR_ERR; | |
333 | } | |
334 | sr_dbg("%s: setting pattern to %d", | |
335 | __func__, devc->sample_generator); | |
336 | } else { | |
337 | ret = SR_ERR_NA; | |
338 | } | |
339 | ||
340 | return ret; | |
341 | } | |
342 | ||
343 | static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi) | |
344 | { | |
345 | GVariant *gvar; | |
346 | GVariantBuilder gvb; | |
347 | ||
348 | (void)sdi; | |
349 | ||
350 | switch (key) { | |
351 | case SR_CONF_DEVICE_OPTIONS: | |
352 | *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, | |
353 | hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t)); | |
354 | break; | |
355 | case SR_CONF_SAMPLERATE: | |
356 | g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}")); | |
357 | gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates, | |
358 | ARRAY_SIZE(samplerates), sizeof(uint64_t)); | |
359 | g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar); | |
360 | *data = g_variant_builder_end(&gvb); | |
361 | break; | |
362 | case SR_CONF_PATTERN_MODE: | |
363 | *data = g_variant_new_strv(pattern_strings, ARRAY_SIZE(pattern_strings)); | |
364 | break; | |
365 | default: | |
366 | return SR_ERR_NA; | |
367 | } | |
368 | ||
369 | return SR_OK; | |
370 | } | |
371 | ||
372 | static void samples_generator(uint8_t *buf, uint64_t size, | |
373 | struct dev_context *devc) | |
374 | { | |
375 | static uint64_t p = 0; | |
376 | uint64_t i; | |
377 | ||
378 | /* TODO: Needed? */ | |
379 | memset(buf, 0, size); | |
380 | ||
381 | switch (devc->sample_generator) { | |
382 | case PATTERN_SIGROK: /* sigrok pattern */ | |
383 | for (i = 0; i < size; i++) { | |
384 | *(buf + i) = ~(pattern_sigrok[ | |
385 | p++ % sizeof(pattern_sigrok)] >> 1); | |
386 | } | |
387 | break; | |
388 | case PATTERN_RANDOM: /* Random */ | |
389 | for (i = 0; i < size; i++) | |
390 | *(buf + i) = (uint8_t)(rand() & 0xff); | |
391 | break; | |
392 | case PATTERN_INC: /* Simple increment */ | |
393 | for (i = 0; i < size; i++) | |
394 | *(buf + i) = p++; | |
395 | break; | |
396 | case PATTERN_ALL_LOW: /* All probes are low */ | |
397 | memset(buf, 0x00, size); | |
398 | break; | |
399 | case PATTERN_ALL_HIGH: /* All probes are high */ | |
400 | memset(buf, 0xff, size); | |
401 | break; | |
402 | default: | |
403 | sr_err("Unknown pattern: %d.", devc->sample_generator); | |
404 | break; | |
405 | } | |
406 | } | |
407 | ||
408 | /* Callback handling data */ | |
409 | static int receive_data(int fd, int revents, void *cb_data) | |
410 | { | |
411 | struct dev_context *devc = cb_data; | |
412 | struct sr_datafeed_packet packet; | |
413 | struct sr_datafeed_logic logic; | |
414 | uint8_t buf[BUFSIZE]; | |
415 | static uint64_t samples_to_send, expected_samplenum, sending_now; | |
416 | int64_t time, elapsed; | |
417 | ||
418 | (void)fd; | |
419 | (void)revents; | |
420 | ||
421 | /* How many "virtual" samples should we have collected by now? */ | |
422 | time = g_get_monotonic_time(); | |
423 | elapsed = time - devc->starttime; | |
424 | expected_samplenum = elapsed * devc->cur_samplerate / 1000000; | |
425 | /* Of those, how many do we still have to send? */ | |
426 | samples_to_send = expected_samplenum - devc->samples_counter; | |
427 | ||
428 | if (devc->limit_samples) { | |
429 | samples_to_send = MIN(samples_to_send, | |
430 | devc->limit_samples - devc->samples_counter); | |
431 | } | |
432 | ||
433 | while (samples_to_send > 0) { | |
434 | sending_now = MIN(samples_to_send, sizeof(buf)); | |
435 | samples_to_send -= sending_now; | |
436 | samples_generator(buf, sending_now, devc); | |
437 | ||
438 | packet.type = SR_DF_LOGIC; | |
439 | packet.payload = &logic; | |
440 | logic.length = sending_now; | |
441 | logic.unitsize = 1; | |
442 | logic.data = buf; | |
443 | sr_session_send(devc->cb_data, &packet); | |
444 | devc->samples_counter += sending_now; | |
445 | } | |
446 | ||
447 | if (devc->limit_samples && | |
448 | devc->samples_counter >= devc->limit_samples) { | |
449 | sr_info("Requested number of samples reached."); | |
450 | hw_dev_acquisition_stop(devc->sdi, cb_data); | |
451 | return TRUE; | |
452 | } | |
453 | ||
454 | return TRUE; | |
455 | } | |
456 | ||
457 | static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi, | |
458 | void *cb_data) | |
459 | { | |
460 | struct dev_context *const devc = sdi->priv; | |
461 | ||
462 | if (sdi->status != SR_ST_ACTIVE) | |
463 | return SR_ERR_DEV_CLOSED; | |
464 | ||
465 | devc->cb_data = cb_data; | |
466 | devc->samples_counter = 0; | |
467 | ||
468 | /* | |
469 | * Setting two channels connected by a pipe is a remnant from when the | |
470 | * demo driver generated data in a thread, and collected and sent the | |
471 | * data in the main program loop. | |
472 | * They are kept here because it provides a convenient way of setting | |
473 | * up a timeout-based polling mechanism. | |
474 | */ | |
475 | if (pipe(devc->pipe_fds)) { | |
476 | /* TODO: Better error message. */ | |
477 | sr_err("%s: pipe() failed", __func__); | |
478 | return SR_ERR; | |
479 | } | |
480 | ||
481 | devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]); | |
482 | ||
483 | g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL); | |
484 | ||
485 | /* Set channel encoding to binary (default is UTF-8). */ | |
486 | g_io_channel_set_encoding(devc->channel, NULL, NULL); | |
487 | ||
488 | /* Make channels to unbuffered. */ | |
489 | g_io_channel_set_buffered(devc->channel, FALSE); | |
490 | ||
491 | sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR, | |
492 | 40, receive_data, devc); | |
493 | ||
494 | /* Send header packet to the session bus. */ | |
495 | std_session_send_df_header(cb_data, LOG_PREFIX); | |
496 | ||
497 | /* We use this timestamp to decide how many more samples to send. */ | |
498 | devc->starttime = g_get_monotonic_time(); | |
499 | ||
500 | return SR_OK; | |
501 | } | |
502 | ||
503 | static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) | |
504 | { | |
505 | struct dev_context *const devc = sdi->priv; | |
506 | struct sr_datafeed_packet packet; | |
507 | ||
508 | (void)cb_data; | |
509 | ||
510 | sr_dbg("Stopping aquisition."); | |
511 | ||
512 | sr_session_source_remove_channel(devc->channel); | |
513 | g_io_channel_shutdown(devc->channel, FALSE, NULL); | |
514 | g_io_channel_unref(devc->channel); | |
515 | devc->channel = NULL; | |
516 | ||
517 | /* Send last packet. */ | |
518 | packet.type = SR_DF_END; | |
519 | sr_session_send(devc->cb_data, &packet); | |
520 | ||
521 | return SR_OK; | |
522 | } | |
523 | ||
524 | SR_PRIV struct sr_dev_driver demo_driver_info = { | |
525 | .name = "demo", | |
526 | .longname = "Demo driver and pattern generator", | |
527 | .api_version = 1, | |
528 | .init = hw_init, | |
529 | .cleanup = hw_cleanup, | |
530 | .scan = hw_scan, | |
531 | .dev_list = hw_dev_list, | |
532 | .dev_clear = clear_instances, | |
533 | .config_get = config_get, | |
534 | .config_set = config_set, | |
535 | .config_list = config_list, | |
536 | .dev_open = hw_dev_open, | |
537 | .dev_close = hw_dev_close, | |
538 | .dev_acquisition_start = hw_dev_acquisition_start, | |
539 | .dev_acquisition_stop = hw_dev_acquisition_stop, | |
540 | .priv = NULL, | |
541 | }; |