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 static GSList *dev_insts = NULL;
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(int dev_index, void *cb_data);
143 static int hw_init(void)
151 static int hw_scan(void)
153 struct sr_dev_inst *sdi;
155 sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
157 sr_err("demo: %s: sr_dev_inst_new failed", __func__);
161 dev_insts = g_slist_append(dev_insts, sdi);
166 static int hw_dev_open(int dev_index)
168 /* Avoid compiler warnings. */
171 /* Nothing needed so far. */
176 static int hw_dev_close(int dev_index)
178 /* Avoid compiler warnings. */
181 /* Nothing needed so far. */
186 static int hw_cleanup(void)
188 /* Nothing needed so far. */
192 static const void *hw_dev_info_get(int dev_index, int dev_info_id)
194 struct sr_dev_inst *sdi;
195 const void *info = NULL;
197 if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
198 sr_err("demo: %s: sdi was NULL", __func__);
202 switch (dev_info_id) {
206 case SR_DI_NUM_PROBES:
207 info = GINT_TO_POINTER(NUM_PROBES);
209 case SR_DI_PROBE_NAMES:
212 case SR_DI_SAMPLERATES:
215 case SR_DI_CUR_SAMPLERATE:
216 info = &cur_samplerate;
219 info = &pattern_strings;
226 static int hw_dev_status_get(int dev_index)
228 /* Avoid compiler warnings. */
234 static const int *hw_hwcap_get_all(void)
239 static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
244 /* Avoid compiler warnings. */
247 if (hwcap == SR_HWCAP_PROBECONFIG) {
248 /* Nothing to do, but must be supported */
250 } else if (hwcap == SR_HWCAP_SAMPLERATE) {
251 cur_samplerate = *(const uint64_t *)value;
252 sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
255 } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
257 limit_samples = *(const uint64_t *)value;
258 sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
261 } else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
262 limit_msec = *(const uint64_t *)value;
264 sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
267 } else if (hwcap == SR_HWCAP_PATTERN_MODE) {
270 if (!strcmp(stropt, "sigrok")) {
271 default_pattern = PATTERN_SIGROK;
272 } else if (!strcmp(stropt, "random")) {
273 default_pattern = PATTERN_RANDOM;
274 } else if (!strcmp(stropt, "incremental")) {
275 default_pattern = PATTERN_INC;
276 } else if (!strcmp(stropt, "all-low")) {
277 default_pattern = PATTERN_ALL_LOW;
278 } else if (!strcmp(stropt, "all-high")) {
279 default_pattern = PATTERN_ALL_HIGH;
283 sr_dbg("demo: %s: setting pattern to %d", __func__,
292 static void samples_generator(uint8_t *buf, uint64_t size, void *data)
294 static uint64_t p = 0;
295 struct context *ctx = data;
299 memset(buf, 0, size);
301 switch (ctx->sample_generator) {
302 case PATTERN_SIGROK: /* sigrok pattern */
303 for (i = 0; i < size; i++) {
304 *(buf + i) = ~(pattern_sigrok[p] >> 1);
309 case PATTERN_RANDOM: /* Random */
310 for (i = 0; i < size; i++)
311 *(buf + i) = (uint8_t)(rand() & 0xff);
313 case PATTERN_INC: /* Simple increment */
314 for (i = 0; i < size; i++)
317 case PATTERN_ALL_LOW: /* All probes are low */
318 memset(buf, 0x00, size);
320 case PATTERN_ALL_HIGH: /* All probes are high */
321 memset(buf, 0xff, size);
324 sr_err("demo: %s: unknown pattern %d", __func__,
325 ctx->sample_generator);
330 /* Thread function */
331 static void thread_func(void *data)
333 struct context *ctx = data;
334 uint8_t buf[BUFSIZE];
335 uint64_t nb_to_send = 0;
337 double time_cur, time_last, time_diff;
339 time_last = g_timer_elapsed(ctx->timer, NULL);
341 while (thread_running) {
343 time_cur = g_timer_elapsed(ctx->timer, NULL);
345 time_diff = time_cur - time_last;
346 time_last = time_cur;
348 nb_to_send = cur_samplerate * time_diff;
351 nb_to_send = MIN(nb_to_send,
352 limit_samples - ctx->samples_counter);
355 /* Make sure we don't overflow. */
356 nb_to_send = MIN(nb_to_send, BUFSIZE);
359 samples_generator(buf, nb_to_send, data);
360 ctx->samples_counter += nb_to_send;
362 g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
363 nb_to_send, (gsize *)&bytes_written, NULL);
366 /* Check if we're done. */
367 if ((limit_msec && time_cur * 1000 > limit_msec) ||
368 (limit_samples && ctx->samples_counter >= limit_samples))
370 close(ctx->pipe_fds[1]);
378 /* Callback handling data */
379 static int receive_data(int fd, int revents, void *cb_data)
381 struct context *ctx = cb_data;
382 struct sr_datafeed_packet packet;
383 struct sr_datafeed_logic logic;
384 static uint64_t samples_received = 0;
385 unsigned char c[BUFSIZE];
388 /* Avoid compiler warnings. */
393 g_io_channel_read_chars(ctx->channels[0],
394 (gchar *)&c, BUFSIZE, &z, NULL);
397 packet.type = SR_DF_LOGIC;
398 packet.payload = &logic;
402 sr_session_send(ctx->session_dev_id, &packet);
403 samples_received += z;
407 if (!thread_running && z <= 0) {
408 /* Make sure we don't receive more packets. */
409 g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);
411 /* Send last packet. */
412 packet.type = SR_DF_END;
413 sr_session_send(ctx->session_dev_id, &packet);
421 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
423 struct sr_datafeed_packet *packet;
424 struct sr_datafeed_header *header;
425 struct sr_datafeed_meta_logic meta;
428 /* TODO: 'ctx' is never g_free()'d? */
429 if (!(ctx = g_try_malloc(sizeof(struct context)))) {
430 sr_err("demo: %s: ctx malloc failed", __func__);
431 return SR_ERR_MALLOC;
434 ctx->sample_generator = default_pattern;
435 ctx->session_dev_id = cb_data;
436 ctx->dev_index = dev_index;
437 ctx->samples_counter = 0;
439 if (pipe(ctx->pipe_fds)) {
440 /* TODO: Better error message. */
441 sr_err("demo: %s: pipe() failed", __func__);
445 ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
446 ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
448 g_io_channel_set_flags(ctx->channels[0], G_IO_FLAG_NONBLOCK, NULL);
450 /* Set channel encoding to binary (default is UTF-8). */
451 g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
452 g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);
454 /* Make channels to unbuffered. */
455 g_io_channel_set_buffered(ctx->channels[0], FALSE);
456 g_io_channel_set_buffered(ctx->channels[1], FALSE);
458 sr_session_source_add_channel(ctx->channels[0], G_IO_IN | G_IO_ERR,
459 40, receive_data, ctx);
461 /* Run the demo thread. */
463 /* This must to be done between g_thread_init() & g_thread_create(). */
464 ctx->timer = g_timer_new();
467 g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
469 sr_err("demo: %s: g_thread_create failed", __func__);
470 return SR_ERR; /* TODO */
473 if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
474 sr_err("demo: %s: packet malloc failed", __func__);
475 return SR_ERR_MALLOC;
478 if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
479 sr_err("demo: %s: header malloc failed", __func__);
480 return SR_ERR_MALLOC;
483 packet->type = SR_DF_HEADER;
484 packet->payload = header;
485 header->feed_version = 1;
486 gettimeofday(&header->starttime, NULL);
487 sr_session_send(ctx->session_dev_id, packet);
489 /* Send metadata about the SR_DF_LOGIC packets to come. */
490 packet->type = SR_DF_META_LOGIC;
491 packet->payload = &meta;
492 meta.samplerate = cur_samplerate;
493 meta.num_probes = NUM_PROBES;
494 sr_session_send(ctx->session_dev_id, packet);
502 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
503 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
505 /* Avoid compiler warnings. */
509 /* Stop generate thread. */
515 SR_PRIV struct sr_dev_driver demo_driver_info = {
517 .longname = "Demo driver and pattern generator",
520 .cleanup = hw_cleanup,
522 .dev_open = hw_dev_open,
523 .dev_close = hw_dev_close,
524 .dev_info_get = hw_dev_info_get,
525 .dev_status_get = hw_dev_status_get,
526 .hwcap_get_all = hw_hwcap_get_all,
527 .dev_config_set = hw_dev_config_set,
528 .dev_acquisition_start = hw_dev_acquisition_start,
529 .dev_acquisition_stop = hw_dev_acquisition_stop,