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__);
167 devices = g_slist_append(devices, sdi);
168 ddi->instances = g_slist_append(ddi->instances, sdi);
173 static int hw_dev_open(int dev_index)
175 /* Avoid compiler warnings. */
178 /* Nothing needed so far. */
183 static int hw_dev_close(int dev_index)
185 /* Avoid compiler warnings. */
188 /* Nothing needed so far. */
193 static int hw_cleanup(void)
195 /* Nothing needed so far. */
199 static int hw_info_get(int info_id, const void **data,
200 const struct sr_dev_inst *sdi)
207 case SR_DI_NUM_PROBES:
208 *data = GINT_TO_POINTER(NUM_PROBES);
210 case SR_DI_PROBE_NAMES:
213 case SR_DI_SAMPLERATES:
214 *data = &samplerates;
216 case SR_DI_CUR_SAMPLERATE:
217 *data = &cur_samplerate;
220 *data = &pattern_strings;
229 static int hw_dev_status_get(int dev_index)
231 /* Avoid compiler warnings. */
237 static const int *hw_hwcap_get_all(void)
242 static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
247 /* Avoid compiler warnings. */
250 if (hwcap == SR_HWCAP_PROBECONFIG) {
251 /* Nothing to do, but must be supported */
253 } else if (hwcap == SR_HWCAP_SAMPLERATE) {
254 cur_samplerate = *(const uint64_t *)value;
255 sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
258 } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
260 limit_samples = *(const uint64_t *)value;
261 sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
264 } else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
265 limit_msec = *(const uint64_t *)value;
267 sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
270 } else if (hwcap == SR_HWCAP_PATTERN_MODE) {
273 if (!strcmp(stropt, "sigrok")) {
274 default_pattern = PATTERN_SIGROK;
275 } else if (!strcmp(stropt, "random")) {
276 default_pattern = PATTERN_RANDOM;
277 } else if (!strcmp(stropt, "incremental")) {
278 default_pattern = PATTERN_INC;
279 } else if (!strcmp(stropt, "all-low")) {
280 default_pattern = PATTERN_ALL_LOW;
281 } else if (!strcmp(stropt, "all-high")) {
282 default_pattern = PATTERN_ALL_HIGH;
286 sr_dbg("demo: %s: setting pattern to %d", __func__,
295 static void samples_generator(uint8_t *buf, uint64_t size, void *data)
297 static uint64_t p = 0;
298 struct context *ctx = data;
302 memset(buf, 0, size);
304 switch (ctx->sample_generator) {
305 case PATTERN_SIGROK: /* sigrok pattern */
306 for (i = 0; i < size; i++) {
307 *(buf + i) = ~(pattern_sigrok[p] >> 1);
312 case PATTERN_RANDOM: /* Random */
313 for (i = 0; i < size; i++)
314 *(buf + i) = (uint8_t)(rand() & 0xff);
316 case PATTERN_INC: /* Simple increment */
317 for (i = 0; i < size; i++)
320 case PATTERN_ALL_LOW: /* All probes are low */
321 memset(buf, 0x00, size);
323 case PATTERN_ALL_HIGH: /* All probes are high */
324 memset(buf, 0xff, size);
327 sr_err("demo: %s: unknown pattern %d", __func__,
328 ctx->sample_generator);
333 /* Thread function */
334 static void thread_func(void *data)
336 struct context *ctx = data;
337 uint8_t buf[BUFSIZE];
338 uint64_t nb_to_send = 0;
340 double time_cur, time_last, time_diff;
342 time_last = g_timer_elapsed(ctx->timer, NULL);
344 while (thread_running) {
346 time_cur = g_timer_elapsed(ctx->timer, NULL);
348 time_diff = time_cur - time_last;
349 time_last = time_cur;
351 nb_to_send = cur_samplerate * time_diff;
354 nb_to_send = MIN(nb_to_send,
355 limit_samples - ctx->samples_counter);
358 /* Make sure we don't overflow. */
359 nb_to_send = MIN(nb_to_send, BUFSIZE);
362 samples_generator(buf, nb_to_send, data);
363 ctx->samples_counter += nb_to_send;
365 g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
366 nb_to_send, (gsize *)&bytes_written, NULL);
369 /* Check if we're done. */
370 if ((limit_msec && time_cur * 1000 > limit_msec) ||
371 (limit_samples && ctx->samples_counter >= limit_samples))
373 close(ctx->pipe_fds[1]);
381 /* Callback handling data */
382 static int receive_data(int fd, int revents, void *cb_data)
384 struct context *ctx = cb_data;
385 struct sr_datafeed_packet packet;
386 struct sr_datafeed_logic logic;
387 static uint64_t samples_received = 0;
388 unsigned char c[BUFSIZE];
391 /* Avoid compiler warnings. */
396 g_io_channel_read_chars(ctx->channels[0],
397 (gchar *)&c, BUFSIZE, &z, NULL);
400 packet.type = SR_DF_LOGIC;
401 packet.payload = &logic;
405 sr_session_send(ctx->session_dev_id, &packet);
406 samples_received += z;
410 if (!thread_running && z <= 0) {
411 /* Make sure we don't receive more packets. */
412 g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);
414 /* Send last packet. */
415 packet.type = SR_DF_END;
416 sr_session_send(ctx->session_dev_id, &packet);
424 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
426 struct sr_datafeed_packet *packet;
427 struct sr_datafeed_header *header;
428 struct sr_datafeed_meta_logic meta;
431 /* TODO: 'ctx' is never g_free()'d? */
432 if (!(ctx = g_try_malloc(sizeof(struct context)))) {
433 sr_err("demo: %s: ctx malloc failed", __func__);
434 return SR_ERR_MALLOC;
437 ctx->sample_generator = default_pattern;
438 ctx->session_dev_id = cb_data;
439 ctx->dev_index = dev_index;
440 ctx->samples_counter = 0;
442 if (pipe(ctx->pipe_fds)) {
443 /* TODO: Better error message. */
444 sr_err("demo: %s: pipe() failed", __func__);
448 ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
449 ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
451 g_io_channel_set_flags(ctx->channels[0], G_IO_FLAG_NONBLOCK, NULL);
453 /* Set channel encoding to binary (default is UTF-8). */
454 g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
455 g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);
457 /* Make channels to unbuffered. */
458 g_io_channel_set_buffered(ctx->channels[0], FALSE);
459 g_io_channel_set_buffered(ctx->channels[1], FALSE);
461 sr_session_source_add_channel(ctx->channels[0], G_IO_IN | G_IO_ERR,
462 40, receive_data, ctx);
464 /* Run the demo thread. */
466 /* This must to be done between g_thread_init() & g_thread_create(). */
467 ctx->timer = g_timer_new();
470 g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
472 sr_err("demo: %s: g_thread_create failed", __func__);
473 return SR_ERR; /* TODO */
476 if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
477 sr_err("demo: %s: packet malloc failed", __func__);
478 return SR_ERR_MALLOC;
481 if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
482 sr_err("demo: %s: header malloc failed", __func__);
483 return SR_ERR_MALLOC;
486 packet->type = SR_DF_HEADER;
487 packet->payload = header;
488 header->feed_version = 1;
489 gettimeofday(&header->starttime, NULL);
490 sr_session_send(ctx->session_dev_id, packet);
492 /* Send metadata about the SR_DF_LOGIC packets to come. */
493 packet->type = SR_DF_META_LOGIC;
494 packet->payload = &meta;
495 meta.samplerate = cur_samplerate;
496 meta.num_probes = NUM_PROBES;
497 sr_session_send(ctx->session_dev_id, packet);
505 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
506 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
508 /* Avoid compiler warnings. */
512 /* Stop generate thread. */
518 SR_PRIV struct sr_dev_driver demo_driver_info = {
520 .longname = "Demo driver and pattern generator",
523 .cleanup = hw_cleanup,
525 .dev_open = hw_dev_open,
526 .dev_close = hw_dev_close,
527 .info_get = hw_info_get,
528 .dev_status_get = hw_dev_status_get,
529 // .hwcap_get_all = hw_hwcap_get_all,
530 .dev_config_set = hw_dev_config_set,
531 .dev_acquisition_start = hw_dev_acquisition_start,
532 .dev_acquisition_stop = hw_dev_acquisition_stop,