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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
28 #define pipe(fds) _pipe(fds, 4096, _O_BINARY)
30 #include "libsigrok.h"
31 #include "libsigrok-internal.h"
33 /* TODO: Number of probes should be configurable. */
36 #define DEMONAME "Demo device"
38 /* The size of chunks to send through the session bus. */
39 /* TODO: Should be configurable. */
42 /* Supported patterns which we can generate */
45 * Pattern which spells "sigrok" using '0's (with '1's as "background")
46 * when displayed using the 'bits' output format.
50 /** Pattern which consists of (pseudo-)random values on all probes. */
54 * Pattern which consists of incrementing numbers.
55 * TODO: Better description.
59 /** Pattern where all probes have a low logic state. */
62 /** Pattern where all probes have a high logic state. */
66 /* FIXME: Should not be global. */
70 GIOChannel *channels[2];
71 uint8_t sample_generator;
72 uint8_t thread_running;
73 uint64_t samples_counter;
79 static const int hwcaps[] = {
80 SR_HWCAP_LOGIC_ANALYZER,
83 SR_HWCAP_PATTERN_MODE,
84 SR_HWCAP_LIMIT_SAMPLES,
89 static const struct sr_samplerates samplerates = {
96 static const char *pattern_strings[] = {
105 /* We name the probes 0-7 on our demo driver. */
106 static const char *probe_names[NUM_PROBES + 1] = {
118 static uint8_t pattern_sigrok[] = {
119 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
120 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
121 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
122 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
123 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
124 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
125 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
126 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
129 /* Private, per-device-instance driver context. */
130 /* TODO: struct context as with the other drivers. */
132 /* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
133 SR_PRIV struct sr_dev_driver demo_driver_info;
134 static struct sr_dev_driver *ddi = &demo_driver_info;
135 static uint64_t cur_samplerate = SR_KHZ(200);
136 static uint64_t limit_samples = 0;
137 static uint64_t limit_msec = 0;
138 static int default_pattern = PATTERN_SIGROK;
139 static GThread *my_thread;
140 static int thread_running;
142 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
144 static int hw_init(void)
152 static GSList *hw_scan(GSList *options)
154 struct sr_dev_inst *sdi;
160 sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
162 sr_err("demo: %s: sr_dev_inst_new failed", __func__);
166 devices = g_slist_append(devices, sdi);
167 ddi->instances = g_slist_append(ddi->instances, sdi);
172 static int hw_dev_open(int dev_index)
174 /* Avoid compiler warnings. */
177 /* Nothing needed so far. */
182 static int hw_dev_close(int dev_index)
184 /* Avoid compiler warnings. */
187 /* Nothing needed so far. */
192 static int hw_cleanup(void)
194 /* Nothing needed so far. */
198 static const void *hw_dev_info_get(int dev_index, int dev_info_id)
200 struct sr_dev_inst *sdi;
201 const void *info = NULL;
203 if (!(sdi = sr_dev_inst_get(ddi->instances, dev_index))) {
204 sr_err("demo: %s: sdi was NULL", __func__);
208 switch (dev_info_id) {
212 case SR_DI_NUM_PROBES:
213 info = GINT_TO_POINTER(NUM_PROBES);
215 case SR_DI_PROBE_NAMES:
218 case SR_DI_SAMPLERATES:
221 case SR_DI_CUR_SAMPLERATE:
222 info = &cur_samplerate;
225 info = &pattern_strings;
232 static int hw_dev_status_get(int dev_index)
234 /* Avoid compiler warnings. */
240 static const int *hw_hwcap_get_all(void)
245 static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
250 /* Avoid compiler warnings. */
253 if (hwcap == SR_HWCAP_PROBECONFIG) {
254 /* Nothing to do, but must be supported */
256 } else if (hwcap == SR_HWCAP_SAMPLERATE) {
257 cur_samplerate = *(const uint64_t *)value;
258 sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
261 } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
263 limit_samples = *(const uint64_t *)value;
264 sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
267 } else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
268 limit_msec = *(const uint64_t *)value;
270 sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
273 } else if (hwcap == SR_HWCAP_PATTERN_MODE) {
276 if (!strcmp(stropt, "sigrok")) {
277 default_pattern = PATTERN_SIGROK;
278 } else if (!strcmp(stropt, "random")) {
279 default_pattern = PATTERN_RANDOM;
280 } else if (!strcmp(stropt, "incremental")) {
281 default_pattern = PATTERN_INC;
282 } else if (!strcmp(stropt, "all-low")) {
283 default_pattern = PATTERN_ALL_LOW;
284 } else if (!strcmp(stropt, "all-high")) {
285 default_pattern = PATTERN_ALL_HIGH;
289 sr_dbg("demo: %s: setting pattern to %d", __func__,
298 static void samples_generator(uint8_t *buf, uint64_t size, void *data)
300 static uint64_t p = 0;
301 struct context *ctx = data;
305 memset(buf, 0, size);
307 switch (ctx->sample_generator) {
308 case PATTERN_SIGROK: /* sigrok pattern */
309 for (i = 0; i < size; i++) {
310 *(buf + i) = ~(pattern_sigrok[p] >> 1);
315 case PATTERN_RANDOM: /* Random */
316 for (i = 0; i < size; i++)
317 *(buf + i) = (uint8_t)(rand() & 0xff);
319 case PATTERN_INC: /* Simple increment */
320 for (i = 0; i < size; i++)
323 case PATTERN_ALL_LOW: /* All probes are low */
324 memset(buf, 0x00, size);
326 case PATTERN_ALL_HIGH: /* All probes are high */
327 memset(buf, 0xff, size);
330 sr_err("demo: %s: unknown pattern %d", __func__,
331 ctx->sample_generator);
336 /* Thread function */
337 static void thread_func(void *data)
339 struct context *ctx = data;
340 uint8_t buf[BUFSIZE];
341 uint64_t nb_to_send = 0;
343 double time_cur, time_last, time_diff;
345 time_last = g_timer_elapsed(ctx->timer, NULL);
347 while (thread_running) {
349 time_cur = g_timer_elapsed(ctx->timer, NULL);
351 time_diff = time_cur - time_last;
352 time_last = time_cur;
354 nb_to_send = cur_samplerate * time_diff;
357 nb_to_send = MIN(nb_to_send,
358 limit_samples - ctx->samples_counter);
361 /* Make sure we don't overflow. */
362 nb_to_send = MIN(nb_to_send, BUFSIZE);
365 samples_generator(buf, nb_to_send, data);
366 ctx->samples_counter += nb_to_send;
368 g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
369 nb_to_send, (gsize *)&bytes_written, NULL);
372 /* Check if we're done. */
373 if ((limit_msec && time_cur * 1000 > limit_msec) ||
374 (limit_samples && ctx->samples_counter >= limit_samples))
376 close(ctx->pipe_fds[1]);
384 /* Callback handling data */
385 static int receive_data(int fd, int revents, void *cb_data)
387 struct context *ctx = cb_data;
388 struct sr_datafeed_packet packet;
389 struct sr_datafeed_logic logic;
390 static uint64_t samples_received = 0;
391 unsigned char c[BUFSIZE];
394 /* Avoid compiler warnings. */
399 g_io_channel_read_chars(ctx->channels[0],
400 (gchar *)&c, BUFSIZE, &z, NULL);
403 packet.type = SR_DF_LOGIC;
404 packet.payload = &logic;
408 sr_session_send(ctx->session_dev_id, &packet);
409 samples_received += z;
413 if (!thread_running && z <= 0) {
414 /* Make sure we don't receive more packets. */
415 g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);
417 /* Send last packet. */
418 packet.type = SR_DF_END;
419 sr_session_send(ctx->session_dev_id, &packet);
427 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
429 struct sr_datafeed_packet *packet;
430 struct sr_datafeed_header *header;
431 struct sr_datafeed_meta_logic meta;
434 /* TODO: 'ctx' is never g_free()'d? */
435 if (!(ctx = g_try_malloc(sizeof(struct context)))) {
436 sr_err("demo: %s: ctx malloc failed", __func__);
437 return SR_ERR_MALLOC;
440 ctx->sample_generator = default_pattern;
441 ctx->session_dev_id = cb_data;
442 ctx->dev_index = dev_index;
443 ctx->samples_counter = 0;
445 if (pipe(ctx->pipe_fds)) {
446 /* TODO: Better error message. */
447 sr_err("demo: %s: pipe() failed", __func__);
451 ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
452 ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
454 g_io_channel_set_flags(ctx->channels[0], G_IO_FLAG_NONBLOCK, NULL);
456 /* Set channel encoding to binary (default is UTF-8). */
457 g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
458 g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);
460 /* Make channels to unbuffered. */
461 g_io_channel_set_buffered(ctx->channels[0], FALSE);
462 g_io_channel_set_buffered(ctx->channels[1], FALSE);
464 sr_session_source_add_channel(ctx->channels[0], G_IO_IN | G_IO_ERR,
465 40, receive_data, ctx);
467 /* Run the demo thread. */
469 /* This must to be done between g_thread_init() & g_thread_create(). */
470 ctx->timer = g_timer_new();
473 g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
475 sr_err("demo: %s: g_thread_create failed", __func__);
476 return SR_ERR; /* TODO */
479 if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
480 sr_err("demo: %s: packet malloc failed", __func__);
481 return SR_ERR_MALLOC;
484 if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
485 sr_err("demo: %s: header malloc failed", __func__);
486 return SR_ERR_MALLOC;
489 packet->type = SR_DF_HEADER;
490 packet->payload = header;
491 header->feed_version = 1;
492 gettimeofday(&header->starttime, NULL);
493 sr_session_send(ctx->session_dev_id, packet);
495 /* Send metadata about the SR_DF_LOGIC packets to come. */
496 packet->type = SR_DF_META_LOGIC;
497 packet->payload = &meta;
498 meta.samplerate = cur_samplerate;
499 meta.num_probes = NUM_PROBES;
500 sr_session_send(ctx->session_dev_id, packet);
508 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
509 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
511 /* Avoid compiler warnings. */
515 /* Stop generate thread. */
521 SR_PRIV struct sr_dev_driver demo_driver_info = {
523 .longname = "Demo driver and pattern generator",
526 .cleanup = hw_cleanup,
528 .dev_open = hw_dev_open,
529 .dev_close = hw_dev_close,
530 .dev_info_get = hw_dev_info_get,
531 .dev_status_get = hw_dev_status_get,
532 .hwcap_get_all = hw_hwcap_get_all,
533 .dev_config_set = hw_dev_config_set,
534 .dev_acquisition_start = hw_dev_acquisition_start,
535 .dev_acquisition_stop = hw_dev_acquisition_stop,