2 * This file is part of the sigrok 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 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)
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 hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
146 static int clear_instances(void)
148 /* Nothing needed so far. */
153 static int hw_init(struct sr_context *sr_ctx)
155 return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
158 static GSList *hw_scan(GSList *options)
160 struct sr_dev_inst *sdi;
161 struct sr_probe *probe;
162 struct drv_context *drvc;
163 struct dev_context *devc;
173 sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
175 sr_err("%s: sr_dev_inst_new failed", __func__);
180 for (i = 0; probe_names[i]; i++) {
181 if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
184 sdi->probes = g_slist_append(sdi->probes, probe);
187 devices = g_slist_append(devices, sdi);
188 drvc->instances = g_slist_append(drvc->instances, sdi);
190 /* TODO: 'devc' is never g_free()'d? */
191 if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
192 sr_err("%s: devc malloc failed", __func__);
193 return SR_ERR_MALLOC;
197 devc->cur_samplerate = SR_KHZ(200);
198 devc->limit_samples = 0;
199 devc->limit_msec = 0;
200 devc->sample_generator = PATTERN_SIGROK;
207 static GSList *hw_dev_list(void)
209 return ((struct drv_context *)(di->priv))->instances;
212 static int hw_dev_open(struct sr_dev_inst *sdi)
216 /* Nothing needed so far. */
221 static int hw_dev_close(struct sr_dev_inst *sdi)
225 /* Nothing needed so far. */
230 static int hw_cleanup(void)
232 /* Nothing needed so far. */
236 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
238 struct dev_context *const devc = sdi->priv;
241 case SR_CONF_SAMPLERATE:
242 *data = g_variant_new_uint64(devc->cur_samplerate);
244 case SR_CONF_LIMIT_SAMPLES:
245 *data = g_variant_new_uint64(devc->limit_samples);
247 case SR_CONF_LIMIT_MSEC:
248 *data = g_variant_new_uint64(devc->limit_msec);
250 case SR_CONF_PATTERN_MODE:
251 switch (devc->sample_generator) {
253 *data = g_variant_new_string(STR_PATTERN_SIGROK);
256 *data = g_variant_new_string(STR_PATTERN_RANDOM);
259 *data = g_variant_new_string(STR_PATTERN_INC);
261 case PATTERN_ALL_LOW:
262 *data = g_variant_new_string(STR_PATTERN_ALL_LOW);
264 case PATTERN_ALL_HIGH:
265 *data = g_variant_new_string(STR_PATTERN_ALL_HIGH);
276 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
281 struct dev_context *const devc = sdi->priv;
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);
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);
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__,
300 } else if (id == SR_CONF_PATTERN_MODE) {
301 stropt = g_variant_get_string(data, NULL);
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;
316 sr_dbg("%s: setting pattern to %d",
317 __func__, devc->sample_generator);
325 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
333 case SR_CONF_DEVICE_OPTIONS:
334 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
335 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
337 case SR_CONF_SAMPLERATE:
338 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
339 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
340 ARRAY_SIZE(samplerates), sizeof(uint64_t));
341 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
342 *data = g_variant_builder_end(&gvb);
344 case SR_CONF_PATTERN_MODE:
345 *data = g_variant_new_strv(pattern_strings, ARRAY_SIZE(pattern_strings));
354 static void samples_generator(uint8_t *buf, uint64_t size,
355 struct dev_context *devc)
357 static uint64_t p = 0;
361 memset(buf, 0, size);
363 switch (devc->sample_generator) {
364 case PATTERN_SIGROK: /* sigrok pattern */
365 for (i = 0; i < size; i++) {
366 *(buf + i) = ~(pattern_sigrok[
367 p++ % sizeof(pattern_sigrok)] >> 1);
370 case PATTERN_RANDOM: /* Random */
371 for (i = 0; i < size; i++)
372 *(buf + i) = (uint8_t)(rand() & 0xff);
374 case PATTERN_INC: /* Simple increment */
375 for (i = 0; i < size; i++)
378 case PATTERN_ALL_LOW: /* All probes are low */
379 memset(buf, 0x00, size);
381 case PATTERN_ALL_HIGH: /* All probes are high */
382 memset(buf, 0xff, size);
385 sr_err("Unknown pattern: %d.", devc->sample_generator);
390 /* Callback handling data */
391 static int receive_data(int fd, int revents, void *cb_data)
393 struct dev_context *devc = cb_data;
394 struct sr_datafeed_packet packet;
395 struct sr_datafeed_logic logic;
396 uint8_t buf[BUFSIZE];
397 static uint64_t samples_to_send, expected_samplenum, sending_now;
398 int64_t time, elapsed;
403 /* How many "virtual" samples should we have collected by now? */
404 time = g_get_monotonic_time();
405 elapsed = time - devc->starttime;
406 expected_samplenum = elapsed * devc->cur_samplerate / 1000000;
407 /* Of those, how many do we still have to send? */
408 samples_to_send = expected_samplenum - devc->samples_counter;
410 if (devc->limit_samples) {
411 samples_to_send = MIN(samples_to_send,
412 devc->limit_samples - devc->samples_counter);
415 while (samples_to_send > 0) {
416 sending_now = MIN(samples_to_send, sizeof(buf));
417 samples_to_send -= sending_now;
418 samples_generator(buf, sending_now, devc);
420 packet.type = SR_DF_LOGIC;
421 packet.payload = &logic;
422 logic.length = sending_now;
425 sr_session_send(devc->cb_data, &packet);
426 devc->samples_counter += sending_now;
429 if (devc->limit_samples &&
430 devc->samples_counter >= devc->limit_samples) {
431 sr_info("Requested number of samples reached.");
432 hw_dev_acquisition_stop(devc->sdi, cb_data);
439 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
442 struct dev_context *const devc = sdi->priv;
444 devc->cb_data = cb_data;
445 devc->samples_counter = 0;
448 * Setting two channels connected by a pipe is a remnant from when the
449 * demo driver generated data in a thread, and collected and sent the
450 * data in the main program loop.
451 * They are kept here because it provides a convenient way of setting
452 * up a timeout-based polling mechanism.
454 if (pipe(devc->pipe_fds)) {
455 /* TODO: Better error message. */
456 sr_err("%s: pipe() failed", __func__);
460 devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
462 g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
464 /* Set channel encoding to binary (default is UTF-8). */
465 g_io_channel_set_encoding(devc->channel, NULL, NULL);
467 /* Make channels to unbuffered. */
468 g_io_channel_set_buffered(devc->channel, FALSE);
470 sr_session_source_add_channel(devc->channel, G_IO_IN | G_IO_ERR,
471 40, receive_data, devc);
473 /* Send header packet to the session bus. */
474 std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
476 /* We use this timestamp to decide how many more samples to send. */
477 devc->starttime = g_get_monotonic_time();
482 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
484 struct dev_context *const devc = sdi->priv;
485 struct sr_datafeed_packet packet;
489 sr_dbg("Stopping aquisition.");
491 sr_session_source_remove_channel(devc->channel);
492 g_io_channel_shutdown(devc->channel, FALSE, NULL);
494 /* Send last packet. */
495 packet.type = SR_DF_END;
496 sr_session_send(devc->cb_data, &packet);
501 SR_PRIV struct sr_dev_driver demo_driver_info = {
503 .longname = "Demo driver and pattern generator",
506 .cleanup = hw_cleanup,
508 .dev_list = hw_dev_list,
509 .dev_clear = clear_instances,
510 .config_get = config_get,
511 .config_set = config_set,
512 .config_list = config_list,
513 .dev_open = hw_dev_open,
514 .dev_close = hw_dev_close,
515 .dev_acquisition_start = hw_dev_acquisition_start,
516 .dev_acquisition_stop = hw_dev_acquisition_stop,