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
29 #define pipe(fds) _pipe(fds, 4096, _O_BINARY)
34 #define DEMONAME "Demo device"
35 /* size of chunks to send through the session bus */
44 /* FIXME: Should not be global. */
45 GIOChannel *channels[2];
49 uint8_t sample_generator;
50 uint8_t thread_running;
51 uint64_t samples_counter;
53 gpointer session_device_id;
57 static int capabilities[] = {
58 SR_HWCAP_LOGIC_ANALYZER,
60 SR_HWCAP_PATTERN_MODE,
61 SR_HWCAP_LIMIT_SAMPLES,
66 static struct sr_samplerates samplerates = {
73 static const char *patternmodes[] = {
79 static uint8_t genmode_default[] = {
80 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
81 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
82 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
83 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
84 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
85 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
86 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
87 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
90 /* List of struct sr_device_instance, maintained by opendev()/closedev(). */
91 static GSList *device_instances = NULL;
92 static uint64_t cur_samplerate = SR_KHZ(200);
93 static uint64_t limit_samples = 0;
94 static uint64_t limit_msec = 0;
95 static int default_genmode = GENMODE_DEFAULT;
96 static GThread *my_thread;
97 static int thread_running;
99 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
101 static int hw_init(const char *deviceinfo)
103 struct sr_device_instance *sdi;
105 /* Avoid compiler warnings. */
106 deviceinfo = deviceinfo;
108 sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
112 device_instances = g_slist_append(device_instances, sdi);
117 static int hw_opendev(int device_index)
119 /* Avoid compiler warnings. */
120 device_index = device_index;
122 /* Nothing needed so far. */
126 static void hw_closedev(int device_index)
128 /* Avoid compiler warnings. */
129 device_index = device_index;
131 /* Nothing needed so far. */
134 static void hw_cleanup(void)
136 /* Nothing needed so far. */
139 static void *hw_get_device_info(int device_index, int device_info_id)
141 struct sr_device_instance *sdi;
144 if (!(sdi = sr_get_device_instance(device_instances, device_index)))
147 switch (device_info_id) {
151 case SR_DI_NUM_PROBES:
152 info = GINT_TO_POINTER(NUM_PROBES);
154 case SR_DI_SAMPLERATES:
157 case SR_DI_CUR_SAMPLERATE:
158 info = &cur_samplerate;
160 case SR_DI_PATTERNMODES:
161 info = &patternmodes;
168 static int hw_get_status(int device_index)
170 /* Avoid compiler warnings. */
171 device_index = device_index;
176 static int *hw_get_capabilities(void)
181 static int hw_set_configuration(int device_index, int capability, void *value)
187 /* Avoid compiler warnings. */
188 device_index = device_index;
190 if (capability == SR_HWCAP_PROBECONFIG) {
191 /* Nothing to do, but must be supported */
193 } else if (capability == SR_HWCAP_SAMPLERATE) {
195 cur_samplerate = *tmp_u64;
197 } else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
199 limit_samples = *tmp_u64;
201 } else if (capability == SR_HWCAP_LIMIT_MSEC) {
203 limit_msec = *tmp_u64;
205 } else if (capability == SR_HWCAP_PATTERN_MODE) {
207 if (!strcmp(stropt, "random")) {
208 default_genmode = GENMODE_RANDOM;
210 } else if (!strcmp(stropt, "incremental")) {
211 default_genmode = GENMODE_INC;
223 static void samples_generator(uint8_t *buf, uint64_t size, void *data)
225 static uint64_t p = 0;
226 struct databag *mydata = data;
229 memset(buf, 0, size);
231 switch (mydata->sample_generator) {
232 case GENMODE_DEFAULT:
233 for (i = 0; i < size; i++) {
234 *(buf + i) = ~(genmode_default[p] >> 1);
239 case GENMODE_RANDOM: /* Random */
240 for (i = 0; i < size; i++)
241 *(buf + i) = (uint8_t)(rand() & 0xff);
243 case GENMODE_INC: /* Simple increment */
244 for (i = 0; i < size; i++)
250 /* Thread function */
251 static void thread_func(void *data)
253 struct databag *mydata = data;
254 uint8_t buf[BUFSIZE];
255 uint64_t nb_to_send = 0;
258 double time_cur, time_last, time_diff;
260 time_last = g_timer_elapsed(mydata->timer, NULL);
262 while (thread_running) {
264 time_cur = g_timer_elapsed(mydata->timer, NULL);
266 time_diff = time_cur - time_last;
267 time_last = time_cur;
269 nb_to_send = cur_samplerate * time_diff;
272 nb_to_send = MIN(nb_to_send,
273 limit_samples - mydata->samples_counter);
275 /* Make sure we don't overflow. */
276 nb_to_send = MIN(nb_to_send, BUFSIZE);
279 samples_generator(buf, nb_to_send, data);
280 mydata->samples_counter += nb_to_send;
282 g_io_channel_write_chars(channels[1], (gchar *)&buf,
283 nb_to_send, (gsize *)&bytes_written, NULL);
286 /* Check if we're done. */
287 if ((limit_msec && time_cur * 1000 > limit_msec) ||
288 (limit_samples && mydata->samples_counter >= limit_samples))
290 close(mydata->pipe_fds[1]);
298 /* Callback handling data */
299 static int receive_data(int fd, int revents, void *user_data)
301 struct sr_datafeed_packet packet;
305 /* Avoid compiler warnings. */
310 g_io_channel_read_chars(channels[0],
311 (gchar *)&c, BUFSIZE, &z, NULL);
314 packet.type = SR_DF_LOGIC;
318 sr_session_bus(user_data, &packet);
322 if (!thread_running && z <= 0)
324 /* Make sure we don't receive more packets */
325 g_io_channel_close(channels[0]);
327 /* Send last packet. */
328 packet.type = SR_DF_END;
329 sr_session_bus(user_data, &packet);
337 static int hw_start_acquisition(int device_index, gpointer session_device_id)
339 struct sr_datafeed_packet *packet;
340 struct sr_datafeed_header *header;
341 struct databag *mydata;
343 mydata = malloc(sizeof(struct databag));
345 return SR_ERR_MALLOC;
347 mydata->sample_generator = default_genmode;
348 mydata->session_device_id = session_device_id;
349 mydata->device_index = device_index;
350 mydata->samples_counter = 0;
352 if (pipe(mydata->pipe_fds))
355 channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
356 channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
358 /* Set channel encoding to binary (default is UTF-8). */
359 g_io_channel_set_encoding(channels[0], NULL, NULL);
360 g_io_channel_set_encoding(channels[1], NULL, NULL);
362 /* Make channels to unbuffered. */
363 g_io_channel_set_buffered(channels[0], FALSE);
364 g_io_channel_set_buffered(channels[1], FALSE);
366 sr_source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40,
367 receive_data, session_device_id);
369 /* Run the demo thread. */
371 /* this needs to be done between g_thread_init() and g_thread_create() */
372 mydata->timer = g_timer_new();
375 g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
379 packet = malloc(sizeof(struct sr_datafeed_packet));
380 header = malloc(sizeof(struct sr_datafeed_header));
381 if (!packet || !header)
382 return SR_ERR_MALLOC;
384 packet->type = SR_DF_HEADER;
385 packet->length = sizeof(struct sr_datafeed_header);
386 packet->payload = (unsigned char *)header;
387 header->feed_version = 1;
388 gettimeofday(&header->starttime, NULL);
389 header->samplerate = cur_samplerate;
390 header->protocol_id = SR_PROTO_RAW;
391 header->num_logic_probes = NUM_PROBES;
392 header->num_analog_probes = 0;
393 sr_session_bus(session_device_id, packet);
400 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
402 /* Avoid compiler warnings. */
403 device_index = device_index;
404 session_device_id = session_device_id;
406 /* Stop generate thread. */
410 struct sr_device_plugin demo_plugin_info = {
412 "Demo driver and pattern generator",
421 hw_set_configuration,
422 hw_start_acquisition,