2 * This file is part of the libsigrok project.
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>
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.
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.
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
29 #define pipe(fds) _pipe(fds, 4096, _O_BINARY)
31 #include "libsigrok.h"
32 #include "libsigrok-internal.h"
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)
43 /* TODO: Number of probes should be configurable. */
46 #define DEMONAME "Demo device"
48 /* The size of chunks to send through the session bus. */
49 /* TODO: Should be configurable. */
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"
58 /* Supported patterns which we can generate */
61 * Pattern which spells "sigrok" using '0's (with '1's as "background")
62 * when displayed using the 'bits' output format.
66 /** Pattern which consists of (pseudo-)random values on all probes. */
70 * Pattern which consists of incrementing numbers.
71 * TODO: Better description.
75 /** Pattern where all probes have a low logic state. */
78 /** Pattern where all probes have a high logic state. */
82 /* Private, per-device-instance driver context. */
84 struct sr_dev_inst *sdi;
87 uint64_t cur_samplerate;
88 uint64_t limit_samples;
90 uint8_t sample_generator;
91 uint64_t samples_counter;
96 static const int hwcaps[] = {
97 SR_CONF_LOGIC_ANALYZER,
100 SR_CONF_PATTERN_MODE,
101 SR_CONF_LIMIT_SAMPLES,
106 static const uint64_t samplerates[] = {
112 static const char *pattern_strings[] = {
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",
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,
137 /* Private, per-device-instance driver context. */
138 /* TODO: struct context as with the other drivers. */
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;
144 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
146 static int dev_clear(void)
148 return std_dev_clear(di, NULL);
151 static int init(struct sr_context *sr_ctx)
153 return std_init(sr_ctx, di, LOG_PREFIX);
156 static GSList *scan(GSList *options)
158 struct sr_dev_inst *sdi;
159 struct sr_probe *probe;
160 struct drv_context *drvc;
161 struct dev_context *devc;
171 sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
173 sr_err("Device instance creation failed.");
178 for (i = 0; probe_names[i]; i++) {
179 if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
182 sdi->probes = g_slist_append(sdi->probes, probe);
185 devices = g_slist_append(devices, sdi);
186 drvc->instances = g_slist_append(drvc->instances, sdi);
188 if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
189 sr_err("Device context malloc failed.");
194 devc->cur_samplerate = SR_KHZ(200);
195 devc->limit_samples = 0;
196 devc->limit_msec = 0;
197 devc->sample_generator = PATTERN_SIGROK;
204 static GSList *dev_list(void)
206 return ((struct drv_context *)(di->priv))->instances;
209 static int dev_open(struct sr_dev_inst *sdi)
211 sdi->status = SR_ST_ACTIVE;
216 static int dev_close(struct sr_dev_inst *sdi)
218 sdi->status = SR_ST_INACTIVE;
223 static int cleanup(void)
228 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
230 struct dev_context *const devc = sdi->priv;
233 case SR_CONF_SAMPLERATE:
234 *data = g_variant_new_uint64(devc->cur_samplerate);
236 case SR_CONF_LIMIT_SAMPLES:
237 *data = g_variant_new_uint64(devc->limit_samples);
239 case SR_CONF_LIMIT_MSEC:
240 *data = g_variant_new_uint64(devc->limit_msec);
242 case SR_CONF_PATTERN_MODE:
243 switch (devc->sample_generator) {
245 *data = g_variant_new_string(STR_PATTERN_SIGROK);
248 *data = g_variant_new_string(STR_PATTERN_RANDOM);
251 *data = g_variant_new_string(STR_PATTERN_INC);
253 case PATTERN_ALL_LOW:
254 *data = g_variant_new_string(STR_PATTERN_ALL_LOW);
256 case PATTERN_ALL_HIGH:
257 *data = g_variant_new_string(STR_PATTERN_ALL_HIGH);
268 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
273 struct dev_context *const devc = sdi->priv;
275 if (sdi->status != SR_ST_ACTIVE)
276 return SR_ERR_DEV_CLOSED;
278 if (id == SR_CONF_SAMPLERATE) {
279 devc->cur_samplerate = g_variant_get_uint64(data);
280 sr_dbg("%s: setting samplerate to %" PRIu64, __func__,
281 devc->cur_samplerate);
283 } else if (id == SR_CONF_LIMIT_SAMPLES) {
284 devc->limit_msec = 0;
285 devc->limit_samples = g_variant_get_uint64(data);
286 sr_dbg("%s: setting limit_samples to %" PRIu64, __func__,
287 devc->limit_samples);
289 } else if (id == SR_CONF_LIMIT_MSEC) {
290 devc->limit_msec = g_variant_get_uint64(data);
291 devc->limit_samples = 0;
292 sr_dbg("%s: setting limit_msec to %" PRIu64, __func__,
295 } else if (id == SR_CONF_PATTERN_MODE) {
296 stropt = g_variant_get_string(data, NULL);
298 if (!strcmp(stropt, STR_PATTERN_SIGROK)) {
299 devc->sample_generator = PATTERN_SIGROK;
300 } else if (!strcmp(stropt, STR_PATTERN_RANDOM)) {
301 devc->sample_generator = PATTERN_RANDOM;
302 } else if (!strcmp(stropt, STR_PATTERN_INC)) {
303 devc->sample_generator = PATTERN_INC;
304 } else if (!strcmp(stropt, STR_PATTERN_ALL_LOW)) {
305 devc->sample_generator = PATTERN_ALL_LOW;
306 } else if (!strcmp(stropt, STR_PATTERN_ALL_HIGH)) {
307 devc->sample_generator = PATTERN_ALL_HIGH;
311 sr_dbg("%s: setting pattern to %d",
312 __func__, devc->sample_generator);
320 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
328 case SR_CONF_DEVICE_OPTIONS:
329 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
330 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
332 case SR_CONF_SAMPLERATE:
333 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
334 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
335 ARRAY_SIZE(samplerates), sizeof(uint64_t));
336 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
337 *data = g_variant_builder_end(&gvb);
339 case SR_CONF_PATTERN_MODE:
340 *data = g_variant_new_strv(pattern_strings, ARRAY_SIZE(pattern_strings));
349 static void samples_generator(uint8_t *buf, uint64_t size,
350 struct dev_context *devc)
352 static uint64_t p = 0;
356 memset(buf, 0, size);
358 switch (devc->sample_generator) {
359 case PATTERN_SIGROK: /* sigrok pattern */
360 for (i = 0; i < size; i++) {
361 *(buf + i) = ~(pattern_sigrok[
362 p++ % sizeof(pattern_sigrok)] >> 1);
365 case PATTERN_RANDOM: /* Random */
366 for (i = 0; i < size; i++)
367 *(buf + i) = (uint8_t)(rand() & 0xff);
369 case PATTERN_INC: /* Simple increment */
370 for (i = 0; i < size; i++)
373 case PATTERN_ALL_LOW: /* All probes are low */
374 memset(buf, 0x00, size);
376 case PATTERN_ALL_HIGH: /* All probes are high */
377 memset(buf, 0xff, size);
380 sr_err("Unknown pattern: %d.", devc->sample_generator);
385 /* Callback handling data */
386 static int receive_data(int fd, int revents, void *cb_data)
388 struct dev_context *devc = cb_data;
389 struct sr_datafeed_packet packet;
390 struct sr_datafeed_logic logic;
391 uint8_t buf[BUFSIZE];
392 static uint64_t samples_to_send, expected_samplenum, sending_now;
393 int64_t time, elapsed;
398 /* How many "virtual" samples should we have collected by now? */
399 time = g_get_monotonic_time();
400 elapsed = time - devc->starttime;
401 expected_samplenum = elapsed * devc->cur_samplerate / 1000000;
402 /* Of those, how many do we still have to send? */
403 samples_to_send = expected_samplenum - devc->samples_counter;
405 if (devc->limit_samples) {
406 samples_to_send = MIN(samples_to_send,
407 devc->limit_samples - devc->samples_counter);
410 while (samples_to_send > 0) {
411 sending_now = MIN(samples_to_send, sizeof(buf));
412 samples_to_send -= sending_now;
413 samples_generator(buf, sending_now, devc);
415 packet.type = SR_DF_LOGIC;
416 packet.payload = &logic;
417 logic.length = sending_now;
420 sr_session_send(devc->cb_data, &packet);
421 devc->samples_counter += sending_now;
424 if (devc->limit_samples &&
425 devc->samples_counter >= devc->limit_samples) {
426 sr_info("Requested number of samples reached.");
427 dev_acquisition_stop(devc->sdi, cb_data);
434 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
436 struct dev_context *const devc = sdi->priv;
438 if (sdi->status != SR_ST_ACTIVE)
439 return SR_ERR_DEV_CLOSED;
441 devc->cb_data = cb_data;
442 devc->samples_counter = 0;
445 * Setting two channels connected by a pipe is a remnant from when the
446 * demo driver generated data in a thread, and collected and sent the
447 * data in the main program loop.
448 * They are kept here because it provides a convenient way of setting
449 * up a timeout-based polling mechanism.
451 if (pipe(devc->pipe_fds)) {
452 /* TODO: Better error message. */
453 sr_err("%s: pipe() failed", __func__);
457 devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
459 g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
461 /* Set channel encoding to binary (default is UTF-8). */
462 g_io_channel_set_encoding(devc->channel, NULL, NULL);
464 /* Make channels to unbuffered. */
465 g_io_channel_set_buffered(devc->channel, FALSE);
467 sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR,
468 40, receive_data, devc);
470 /* Send header packet to the session bus. */
471 std_session_send_df_header(cb_data, LOG_PREFIX);
473 /* We use this timestamp to decide how many more samples to send. */
474 devc->starttime = g_get_monotonic_time();
479 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
481 struct dev_context *const devc = sdi->priv;
482 struct sr_datafeed_packet packet;
486 sr_dbg("Stopping aquisition.");
488 sr_session_source_remove_channel(devc->channel);
489 g_io_channel_shutdown(devc->channel, FALSE, NULL);
490 g_io_channel_unref(devc->channel);
491 devc->channel = NULL;
493 /* Send last packet. */
494 packet.type = SR_DF_END;
495 sr_session_send(devc->cb_data, &packet);
500 SR_PRIV struct sr_dev_driver demo_driver_info = {
502 .longname = "Demo driver and pattern generator",
507 .dev_list = dev_list,
508 .dev_clear = dev_clear,
509 .config_get = config_get,
510 .config_set = config_set,
511 .config_list = config_list,
512 .dev_open = dev_open,
513 .dev_close = dev_close,
514 .dev_acquisition_start = dev_acquisition_start,
515 .dev_acquisition_stop = dev_acquisition_stop,