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;
78 static const int hwcaps[] = {
79 SR_HWCAP_LOGIC_ANALYZER,
82 SR_HWCAP_PATTERN_MODE,
83 SR_HWCAP_LIMIT_SAMPLES,
88 static const struct sr_samplerates samplerates = {
95 static const char *pattern_strings[] = {
104 /* We name the probes 0-7 on our demo driver. */
105 static const char *probe_names[NUM_PROBES + 1] = {
117 static uint8_t pattern_sigrok[] = {
118 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
119 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
120 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
121 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
122 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
123 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
124 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
125 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
128 /* Private, per-device-instance driver context. */
129 /* TODO: struct context as with the other drivers. */
131 /* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
132 SR_PRIV struct sr_dev_driver demo_driver_info;
133 static struct sr_dev_driver *ddi = &demo_driver_info;
134 static uint64_t cur_samplerate = SR_KHZ(200);
135 static uint64_t limit_samples = 0;
136 static uint64_t limit_msec = 0;
137 static int default_pattern = PATTERN_SIGROK;
138 static GThread *my_thread;
139 static int thread_running;
141 static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
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(struct sr_dev_inst *sdi)
175 /* Avoid compiler warnings. */
178 /* Nothing needed so far. */
183 static int hw_dev_close(struct sr_dev_inst *sdi)
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)
210 case SR_DI_NUM_PROBES:
211 *data = GINT_TO_POINTER(NUM_PROBES);
213 case SR_DI_PROBE_NAMES:
216 case SR_DI_SAMPLERATES:
217 *data = &samplerates;
219 case SR_DI_CUR_SAMPLERATE:
220 *data = &cur_samplerate;
223 *data = &pattern_strings;
232 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
240 if (hwcap == SR_HWCAP_PROBECONFIG) {
241 /* Nothing to do, but must be supported */
243 } else if (hwcap == SR_HWCAP_SAMPLERATE) {
244 cur_samplerate = *(const uint64_t *)value;
245 sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
248 } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
250 limit_samples = *(const uint64_t *)value;
251 sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
254 } else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
255 limit_msec = *(const uint64_t *)value;
257 sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
260 } else if (hwcap == SR_HWCAP_PATTERN_MODE) {
263 if (!strcmp(stropt, "sigrok")) {
264 default_pattern = PATTERN_SIGROK;
265 } else if (!strcmp(stropt, "random")) {
266 default_pattern = PATTERN_RANDOM;
267 } else if (!strcmp(stropt, "incremental")) {
268 default_pattern = PATTERN_INC;
269 } else if (!strcmp(stropt, "all-low")) {
270 default_pattern = PATTERN_ALL_LOW;
271 } else if (!strcmp(stropt, "all-high")) {
272 default_pattern = PATTERN_ALL_HIGH;
276 sr_dbg("demo: %s: setting pattern to %d", __func__,
285 static void samples_generator(uint8_t *buf, uint64_t size, void *data)
287 static uint64_t p = 0;
288 struct context *ctx = data;
292 memset(buf, 0, size);
294 switch (ctx->sample_generator) {
295 case PATTERN_SIGROK: /* sigrok pattern */
296 for (i = 0; i < size; i++) {
297 *(buf + i) = ~(pattern_sigrok[p] >> 1);
302 case PATTERN_RANDOM: /* Random */
303 for (i = 0; i < size; i++)
304 *(buf + i) = (uint8_t)(rand() & 0xff);
306 case PATTERN_INC: /* Simple increment */
307 for (i = 0; i < size; i++)
310 case PATTERN_ALL_LOW: /* All probes are low */
311 memset(buf, 0x00, size);
313 case PATTERN_ALL_HIGH: /* All probes are high */
314 memset(buf, 0xff, size);
317 sr_err("demo: %s: unknown pattern %d", __func__,
318 ctx->sample_generator);
323 /* Thread function */
324 static void thread_func(void *data)
326 struct context *ctx = data;
327 uint8_t buf[BUFSIZE];
328 uint64_t nb_to_send = 0;
330 double time_cur, time_last, time_diff;
332 time_last = g_timer_elapsed(ctx->timer, NULL);
334 while (thread_running) {
336 time_cur = g_timer_elapsed(ctx->timer, NULL);
338 time_diff = time_cur - time_last;
339 time_last = time_cur;
341 nb_to_send = cur_samplerate * time_diff;
344 nb_to_send = MIN(nb_to_send,
345 limit_samples - ctx->samples_counter);
348 /* Make sure we don't overflow. */
349 nb_to_send = MIN(nb_to_send, BUFSIZE);
352 samples_generator(buf, nb_to_send, data);
353 ctx->samples_counter += nb_to_send;
355 g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
356 nb_to_send, (gsize *)&bytes_written, NULL);
359 /* Check if we're done. */
360 if ((limit_msec && time_cur * 1000 > limit_msec) ||
361 (limit_samples && ctx->samples_counter >= limit_samples))
363 close(ctx->pipe_fds[1]);
371 /* Callback handling data */
372 static int receive_data(int fd, int revents, void *cb_data)
374 struct context *ctx = cb_data;
375 struct sr_datafeed_packet packet;
376 struct sr_datafeed_logic logic;
377 static uint64_t samples_received = 0;
378 unsigned char c[BUFSIZE];
381 /* Avoid compiler warnings. */
386 g_io_channel_read_chars(ctx->channels[0],
387 (gchar *)&c, BUFSIZE, &z, NULL);
390 packet.type = SR_DF_LOGIC;
391 packet.payload = &logic;
395 sr_session_send(ctx->session_dev_id, &packet);
396 samples_received += z;
400 if (!thread_running && z <= 0) {
401 /* Make sure we don't receive more packets. */
402 g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);
404 /* Send last packet. */
405 packet.type = SR_DF_END;
406 sr_session_send(ctx->session_dev_id, &packet);
414 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
417 struct sr_datafeed_packet *packet;
418 struct sr_datafeed_header *header;
419 struct sr_datafeed_meta_logic meta;
424 /* TODO: 'ctx' is never g_free()'d? */
425 if (!(ctx = g_try_malloc(sizeof(struct context)))) {
426 sr_err("demo: %s: ctx malloc failed", __func__);
427 return SR_ERR_MALLOC;
430 ctx->sample_generator = default_pattern;
431 ctx->session_dev_id = cb_data;
432 ctx->samples_counter = 0;
434 if (pipe(ctx->pipe_fds)) {
435 /* TODO: Better error message. */
436 sr_err("demo: %s: pipe() failed", __func__);
440 ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
441 ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
443 g_io_channel_set_flags(ctx->channels[0], G_IO_FLAG_NONBLOCK, NULL);
445 /* Set channel encoding to binary (default is UTF-8). */
446 g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
447 g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);
449 /* Make channels to unbuffered. */
450 g_io_channel_set_buffered(ctx->channels[0], FALSE);
451 g_io_channel_set_buffered(ctx->channels[1], FALSE);
453 sr_session_source_add_channel(ctx->channels[0], G_IO_IN | G_IO_ERR,
454 40, receive_data, ctx);
456 /* Run the demo thread. */
458 /* This must to be done between g_thread_init() & g_thread_create(). */
459 ctx->timer = g_timer_new();
462 g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
464 sr_err("demo: %s: g_thread_create failed", __func__);
465 return SR_ERR; /* TODO */
468 if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
469 sr_err("demo: %s: packet malloc failed", __func__);
470 return SR_ERR_MALLOC;
473 if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
474 sr_err("demo: %s: header malloc failed", __func__);
475 return SR_ERR_MALLOC;
478 packet->type = SR_DF_HEADER;
479 packet->payload = header;
480 header->feed_version = 1;
481 gettimeofday(&header->starttime, NULL);
482 sr_session_send(ctx->session_dev_id, packet);
484 /* Send metadata about the SR_DF_LOGIC packets to come. */
485 packet->type = SR_DF_META_LOGIC;
486 packet->payload = &meta;
487 meta.samplerate = cur_samplerate;
488 meta.num_probes = NUM_PROBES;
489 sr_session_send(ctx->session_dev_id, packet);
497 static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
500 /* Avoid compiler warnings. */
504 /* Stop generate thread. */
510 SR_PRIV struct sr_dev_driver demo_driver_info = {
512 .longname = "Demo driver and pattern generator",
515 .cleanup = hw_cleanup,
517 .dev_open = hw_dev_open,
518 .dev_close = hw_dev_close,
519 .info_get = hw_info_get,
520 .dev_config_set = hw_dev_config_set,
521 .dev_acquisition_start = hw_dev_acquisition_start,
522 .dev_acquisition_stop = hw_dev_acquisition_stop,