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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 dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data); | |
145 | ||
146 | static int dev_clear(void) | |
147 | { | |
148 | return std_dev_clear(di, NULL); | |
149 | } | |
150 | ||
151 | static int init(struct sr_context *sr_ctx) | |
152 | { | |
153 | return std_init(sr_ctx, di, LOG_PREFIX); | |
154 | } | |
155 | ||
156 | static GSList *scan(GSList *options) | |
157 | { | |
158 | struct sr_dev_inst *sdi; | |
159 | struct sr_probe *probe; | |
160 | struct drv_context *drvc; | |
161 | struct dev_context *devc; | |
162 | GSList *devices; | |
163 | int i; | |
164 | ||
165 | (void)options; | |
166 | ||
167 | drvc = di->priv; | |
168 | ||
169 | devices = NULL; | |
170 | ||
171 | sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL); | |
172 | if (!sdi) { | |
173 | sr_err("Device instance creation failed."); | |
174 | return NULL; | |
175 | } | |
176 | sdi->driver = di; | |
177 | ||
178 | for (i = 0; probe_names[i]; i++) { | |
179 | if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE, | |
180 | probe_names[i]))) | |
181 | return NULL; | |
182 | sdi->probes = g_slist_append(sdi->probes, probe); | |
183 | } | |
184 | ||
185 | devices = g_slist_append(devices, sdi); | |
186 | drvc->instances = g_slist_append(drvc->instances, sdi); | |
187 | ||
188 | if (!(devc = g_try_malloc(sizeof(struct dev_context)))) { | |
189 | sr_err("Device context malloc failed."); | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | devc->sdi = sdi; | |
194 | devc->cur_samplerate = SR_KHZ(200); | |
195 | devc->limit_samples = 0; | |
196 | devc->limit_msec = 0; | |
197 | devc->sample_generator = PATTERN_SIGROK; | |
198 | ||
199 | sdi->priv = devc; | |
200 | ||
201 | return devices; | |
202 | } | |
203 | ||
204 | static GSList *dev_list(void) | |
205 | { | |
206 | return ((struct drv_context *)(di->priv))->instances; | |
207 | } | |
208 | ||
209 | static int dev_open(struct sr_dev_inst *sdi) | |
210 | { | |
211 | sdi->status = SR_ST_ACTIVE; | |
212 | ||
213 | return SR_OK; | |
214 | } | |
215 | ||
216 | static int dev_close(struct sr_dev_inst *sdi) | |
217 | { | |
218 | sdi->status = SR_ST_INACTIVE; | |
219 | ||
220 | return SR_OK; | |
221 | } | |
222 | ||
223 | static int cleanup(void) | |
224 | { | |
225 | return dev_clear(); | |
226 | } | |
227 | ||
228 | static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi, | |
229 | const struct sr_probe_group *probe_group) | |
230 | { | |
231 | struct dev_context *const devc = sdi->priv; | |
232 | ||
233 | (void)probe_group; | |
234 | ||
235 | switch (id) { | |
236 | case SR_CONF_SAMPLERATE: | |
237 | *data = g_variant_new_uint64(devc->cur_samplerate); | |
238 | break; | |
239 | case SR_CONF_LIMIT_SAMPLES: | |
240 | *data = g_variant_new_uint64(devc->limit_samples); | |
241 | break; | |
242 | case SR_CONF_LIMIT_MSEC: | |
243 | *data = g_variant_new_uint64(devc->limit_msec); | |
244 | break; | |
245 | case SR_CONF_PATTERN_MODE: | |
246 | switch (devc->sample_generator) { | |
247 | case PATTERN_SIGROK: | |
248 | *data = g_variant_new_string(STR_PATTERN_SIGROK); | |
249 | break; | |
250 | case PATTERN_RANDOM: | |
251 | *data = g_variant_new_string(STR_PATTERN_RANDOM); | |
252 | break; | |
253 | case PATTERN_INC: | |
254 | *data = g_variant_new_string(STR_PATTERN_INC); | |
255 | break; | |
256 | case PATTERN_ALL_LOW: | |
257 | *data = g_variant_new_string(STR_PATTERN_ALL_LOW); | |
258 | break; | |
259 | case PATTERN_ALL_HIGH: | |
260 | *data = g_variant_new_string(STR_PATTERN_ALL_HIGH); | |
261 | break; | |
262 | } | |
263 | break; | |
264 | default: | |
265 | return SR_ERR_NA; | |
266 | } | |
267 | ||
268 | return SR_OK; | |
269 | } | |
270 | ||
271 | static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi, | |
272 | const struct sr_probe_group *probe_group) | |
273 | { | |
274 | int ret; | |
275 | const char *stropt; | |
276 | ||
277 | (void)probe_group; | |
278 | struct dev_context *const devc = sdi->priv; | |
279 | ||
280 | if (sdi->status != SR_ST_ACTIVE) | |
281 | return SR_ERR_DEV_CLOSED; | |
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_NA; | |
320 | } | |
321 | ||
322 | return ret; | |
323 | } | |
324 | ||
325 | static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi, | |
326 | const struct sr_probe_group *probe_group) | |
327 | { | |
328 | GVariant *gvar; | |
329 | GVariantBuilder gvb; | |
330 | ||
331 | (void)sdi; | |
332 | (void)probe_group; | |
333 | ||
334 | switch (key) { | |
335 | case SR_CONF_DEVICE_OPTIONS: | |
336 | *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, | |
337 | hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t)); | |
338 | break; | |
339 | case SR_CONF_SAMPLERATE: | |
340 | g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}")); | |
341 | gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates, | |
342 | ARRAY_SIZE(samplerates), sizeof(uint64_t)); | |
343 | g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar); | |
344 | *data = g_variant_builder_end(&gvb); | |
345 | break; | |
346 | case SR_CONF_PATTERN_MODE: | |
347 | *data = g_variant_new_strv(pattern_strings, ARRAY_SIZE(pattern_strings)); | |
348 | break; | |
349 | default: | |
350 | return SR_ERR_NA; | |
351 | } | |
352 | ||
353 | return SR_OK; | |
354 | } | |
355 | ||
356 | static void samples_generator(uint8_t *buf, uint64_t size, | |
357 | struct dev_context *devc) | |
358 | { | |
359 | static uint64_t p = 0; | |
360 | uint64_t i; | |
361 | ||
362 | /* TODO: Needed? */ | |
363 | memset(buf, 0, size); | |
364 | ||
365 | switch (devc->sample_generator) { | |
366 | case PATTERN_SIGROK: /* sigrok pattern */ | |
367 | for (i = 0; i < size; i++) { | |
368 | *(buf + i) = ~(pattern_sigrok[ | |
369 | p++ % sizeof(pattern_sigrok)] >> 1); | |
370 | } | |
371 | break; | |
372 | case PATTERN_RANDOM: /* Random */ | |
373 | for (i = 0; i < size; i++) | |
374 | *(buf + i) = (uint8_t)(rand() & 0xff); | |
375 | break; | |
376 | case PATTERN_INC: /* Simple increment */ | |
377 | for (i = 0; i < size; i++) | |
378 | *(buf + i) = p++; | |
379 | break; | |
380 | case PATTERN_ALL_LOW: /* All probes are low */ | |
381 | memset(buf, 0x00, size); | |
382 | break; | |
383 | case PATTERN_ALL_HIGH: /* All probes are high */ | |
384 | memset(buf, 0xff, size); | |
385 | break; | |
386 | default: | |
387 | sr_err("Unknown pattern: %d.", devc->sample_generator); | |
388 | break; | |
389 | } | |
390 | } | |
391 | ||
392 | /* Callback handling data */ | |
393 | static int receive_data(int fd, int revents, void *cb_data) | |
394 | { | |
395 | struct dev_context *devc = cb_data; | |
396 | struct sr_datafeed_packet packet; | |
397 | struct sr_datafeed_logic logic; | |
398 | uint8_t buf[BUFSIZE]; | |
399 | static uint64_t samples_to_send, expected_samplenum, sending_now; | |
400 | int64_t time, elapsed; | |
401 | ||
402 | (void)fd; | |
403 | (void)revents; | |
404 | ||
405 | /* How many "virtual" samples should we have collected by now? */ | |
406 | time = g_get_monotonic_time(); | |
407 | elapsed = time - devc->starttime; | |
408 | expected_samplenum = elapsed * devc->cur_samplerate / 1000000; | |
409 | /* Of those, how many do we still have to send? */ | |
410 | samples_to_send = expected_samplenum - devc->samples_counter; | |
411 | ||
412 | if (devc->limit_samples) { | |
413 | samples_to_send = MIN(samples_to_send, | |
414 | devc->limit_samples - devc->samples_counter); | |
415 | } | |
416 | ||
417 | while (samples_to_send > 0) { | |
418 | sending_now = MIN(samples_to_send, sizeof(buf)); | |
419 | samples_to_send -= sending_now; | |
420 | samples_generator(buf, sending_now, devc); | |
421 | ||
422 | packet.type = SR_DF_LOGIC; | |
423 | packet.payload = &logic; | |
424 | logic.length = sending_now; | |
425 | logic.unitsize = 1; | |
426 | logic.data = buf; | |
427 | sr_session_send(devc->cb_data, &packet); | |
428 | devc->samples_counter += sending_now; | |
429 | } | |
430 | ||
431 | if (devc->limit_samples && | |
432 | devc->samples_counter >= devc->limit_samples) { | |
433 | sr_info("Requested number of samples reached."); | |
434 | dev_acquisition_stop(devc->sdi, cb_data); | |
435 | return TRUE; | |
436 | } | |
437 | ||
438 | return TRUE; | |
439 | } | |
440 | ||
441 | static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data) | |
442 | { | |
443 | struct dev_context *const devc = sdi->priv; | |
444 | ||
445 | if (sdi->status != SR_ST_ACTIVE) | |
446 | return SR_ERR_DEV_CLOSED; | |
447 | ||
448 | devc->cb_data = cb_data; | |
449 | devc->samples_counter = 0; | |
450 | ||
451 | /* | |
452 | * Setting two channels connected by a pipe is a remnant from when the | |
453 | * demo driver generated data in a thread, and collected and sent the | |
454 | * data in the main program loop. | |
455 | * They are kept here because it provides a convenient way of setting | |
456 | * up a timeout-based polling mechanism. | |
457 | */ | |
458 | if (pipe(devc->pipe_fds)) { | |
459 | /* TODO: Better error message. */ | |
460 | sr_err("%s: pipe() failed", __func__); | |
461 | return SR_ERR; | |
462 | } | |
463 | ||
464 | devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]); | |
465 | ||
466 | g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL); | |
467 | ||
468 | /* Set channel encoding to binary (default is UTF-8). */ | |
469 | g_io_channel_set_encoding(devc->channel, NULL, NULL); | |
470 | ||
471 | /* Make channels to unbuffered. */ | |
472 | g_io_channel_set_buffered(devc->channel, FALSE); | |
473 | ||
474 | sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR, | |
475 | 40, receive_data, devc); | |
476 | ||
477 | /* Send header packet to the session bus. */ | |
478 | std_session_send_df_header(cb_data, LOG_PREFIX); | |
479 | ||
480 | /* We use this timestamp to decide how many more samples to send. */ | |
481 | devc->starttime = g_get_monotonic_time(); | |
482 | ||
483 | return SR_OK; | |
484 | } | |
485 | ||
486 | static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) | |
487 | { | |
488 | struct dev_context *const devc = sdi->priv; | |
489 | struct sr_datafeed_packet packet; | |
490 | ||
491 | (void)cb_data; | |
492 | ||
493 | sr_dbg("Stopping aquisition."); | |
494 | ||
495 | sr_session_source_remove_channel(devc->channel); | |
496 | g_io_channel_shutdown(devc->channel, FALSE, NULL); | |
497 | g_io_channel_unref(devc->channel); | |
498 | devc->channel = NULL; | |
499 | ||
500 | /* Send last packet. */ | |
501 | packet.type = SR_DF_END; | |
502 | sr_session_send(devc->cb_data, &packet); | |
503 | ||
504 | return SR_OK; | |
505 | } | |
506 | ||
507 | SR_PRIV struct sr_dev_driver demo_driver_info = { | |
508 | .name = "demo", | |
509 | .longname = "Demo driver and pattern generator", | |
510 | .api_version = 1, | |
511 | .init = init, | |
512 | .cleanup = cleanup, | |
513 | .scan = scan, | |
514 | .dev_list = dev_list, | |
515 | .dev_clear = dev_clear, | |
516 | .config_get = config_get, | |
517 | .config_set = config_set, | |
518 | .config_list = config_list, | |
519 | .dev_open = dev_open, | |
520 | .dev_close = dev_close, | |
521 | .dev_acquisition_start = dev_acquisition_start, | |
522 | .dev_acquisition_stop = dev_acquisition_stop, | |
523 | .priv = NULL, | |
524 | }; |