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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com> | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <sigrok.h> | |
26 | #ifdef _WIN32 | |
27 | #include <io.h> | |
28 | #include <fcntl.h> | |
29 | #define pipe(fds) _pipe(fds, 4096, _O_BINARY) | |
30 | #endif | |
31 | #include "config.h" | |
32 | ||
33 | #define NUM_PROBES 8 | |
34 | #define DEMONAME "Demo device" | |
35 | /* size of chunks to send through the session bus */ | |
36 | #define BUFSIZE 4096 | |
37 | ||
38 | enum { | |
39 | GENMODE_DEFAULT, | |
40 | GENMODE_RANDOM, | |
41 | GENMODE_INC, | |
42 | }; | |
43 | ||
44 | /* FIXME: Should not be global. */ | |
45 | GIOChannel *channels[2]; | |
46 | ||
47 | struct databag { | |
48 | int pipe_fds[2]; | |
49 | uint8_t sample_generator; | |
50 | uint8_t thread_running; | |
51 | uint64_t samples_counter; | |
52 | int device_index; | |
53 | gpointer session_device_id; | |
54 | GTimer *timer; | |
55 | }; | |
56 | ||
57 | static int capabilities[] = { | |
58 | SR_HWCAP_LOGIC_ANALYZER, | |
59 | SR_HWCAP_SAMPLERATE, | |
60 | SR_HWCAP_PATTERN_MODE, | |
61 | SR_HWCAP_LIMIT_SAMPLES, | |
62 | SR_HWCAP_LIMIT_MSEC, | |
63 | SR_HWCAP_CONTINUOUS, | |
64 | }; | |
65 | ||
66 | static struct sr_samplerates samplerates = { | |
67 | 1, | |
68 | GHZ(1), | |
69 | 1, | |
70 | NULL, | |
71 | }; | |
72 | ||
73 | static const char *patternmodes[] = { | |
74 | "random", | |
75 | "incremental", | |
76 | NULL, | |
77 | }; | |
78 | ||
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, | |
88 | }; | |
89 | ||
90 | /* List of struct sr_device_instance, maintained by opendev()/closedev(). */ | |
91 | static GSList *device_instances = NULL; | |
92 | static uint64_t cur_samplerate = 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; | |
98 | ||
99 | static void hw_stop_acquisition(int device_index, gpointer session_device_id); | |
100 | ||
101 | static int hw_init(char *deviceinfo) | |
102 | { | |
103 | struct sr_device_instance *sdi; | |
104 | ||
105 | /* Avoid compiler warnings. */ | |
106 | deviceinfo = deviceinfo; | |
107 | ||
108 | sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL); | |
109 | if (!sdi) | |
110 | return 0; | |
111 | ||
112 | device_instances = g_slist_append(device_instances, sdi); | |
113 | ||
114 | return 1; | |
115 | } | |
116 | ||
117 | static int hw_opendev(int device_index) | |
118 | { | |
119 | /* Avoid compiler warnings. */ | |
120 | device_index = device_index; | |
121 | ||
122 | /* Nothing needed so far. */ | |
123 | return SR_OK; | |
124 | } | |
125 | ||
126 | static void hw_closedev(int device_index) | |
127 | { | |
128 | /* Avoid compiler warnings. */ | |
129 | device_index = device_index; | |
130 | ||
131 | /* Nothing needed so far. */ | |
132 | } | |
133 | ||
134 | static void hw_cleanup(void) | |
135 | { | |
136 | /* Nothing needed so far. */ | |
137 | } | |
138 | ||
139 | static void *hw_get_device_info(int device_index, int device_info_id) | |
140 | { | |
141 | struct sr_device_instance *sdi; | |
142 | void *info = NULL; | |
143 | ||
144 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) | |
145 | return NULL; | |
146 | ||
147 | switch (device_info_id) { | |
148 | case SR_DI_INSTANCE: | |
149 | info = sdi; | |
150 | break; | |
151 | case SR_DI_NUM_PROBES: | |
152 | info = GINT_TO_POINTER(NUM_PROBES); | |
153 | break; | |
154 | case SR_DI_SAMPLERATES: | |
155 | info = &samplerates; | |
156 | break; | |
157 | case SR_DI_CUR_SAMPLERATE: | |
158 | info = &cur_samplerate; | |
159 | break; | |
160 | case SR_DI_PATTERNMODES: | |
161 | info = &patternmodes; | |
162 | break; | |
163 | } | |
164 | ||
165 | return info; | |
166 | } | |
167 | ||
168 | static int hw_get_status(int device_index) | |
169 | { | |
170 | /* Avoid compiler warnings. */ | |
171 | device_index = device_index; | |
172 | ||
173 | return SR_ST_ACTIVE; | |
174 | } | |
175 | ||
176 | static int *hw_get_capabilities(void) | |
177 | { | |
178 | return capabilities; | |
179 | } | |
180 | ||
181 | static int hw_set_configuration(int device_index, int capability, void *value) | |
182 | { | |
183 | int ret; | |
184 | uint64_t *tmp_u64; | |
185 | char *stropt; | |
186 | ||
187 | /* Avoid compiler warnings. */ | |
188 | device_index = device_index; | |
189 | ||
190 | if (capability == SR_HWCAP_PROBECONFIG) { | |
191 | /* Nothing to do, but must be supported */ | |
192 | ret = SR_OK; | |
193 | } else if (capability == SR_HWCAP_SAMPLERATE) { | |
194 | tmp_u64 = value; | |
195 | cur_samplerate = *tmp_u64; | |
196 | ret = SR_OK; | |
197 | } else if (capability == SR_HWCAP_LIMIT_SAMPLES) { | |
198 | tmp_u64 = value; | |
199 | limit_samples = *tmp_u64; | |
200 | ret = SR_OK; | |
201 | } else if (capability == SR_HWCAP_LIMIT_MSEC) { | |
202 | tmp_u64 = value; | |
203 | limit_msec = *tmp_u64; | |
204 | ret = SR_OK; | |
205 | } else if (capability == SR_HWCAP_PATTERN_MODE) { | |
206 | stropt = value; | |
207 | if (!strcmp(stropt, "random")) { | |
208 | default_genmode = GENMODE_RANDOM; | |
209 | ret = SR_OK; | |
210 | } else if (!strcmp(stropt, "incremental")) { | |
211 | default_genmode = GENMODE_INC; | |
212 | ret = SR_OK; | |
213 | } else { | |
214 | ret = SR_ERR; | |
215 | } | |
216 | } else { | |
217 | ret = SR_ERR; | |
218 | } | |
219 | ||
220 | return ret; | |
221 | } | |
222 | ||
223 | static void samples_generator(uint8_t *buf, uint64_t size, void *data) | |
224 | { | |
225 | static uint64_t p = 0; | |
226 | struct databag *mydata = data; | |
227 | uint64_t i; | |
228 | ||
229 | memset(buf, 0, size); | |
230 | ||
231 | switch (mydata->sample_generator) { | |
232 | case GENMODE_DEFAULT: | |
233 | for (i = 0; i < size; i++) { | |
234 | *(buf + i) = ~(genmode_default[p] >> 1); | |
235 | if (++p == 64) | |
236 | p = 0; | |
237 | } | |
238 | break; | |
239 | case GENMODE_RANDOM: /* Random */ | |
240 | for (i = 0; i < size; i++) | |
241 | *(buf + i) = (uint8_t)(rand() & 0xff); | |
242 | break; | |
243 | case GENMODE_INC: /* Simple increment */ | |
244 | for (i = 0; i < size; i++) | |
245 | *(buf + i) = i; | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
250 | /* Thread function */ | |
251 | static void thread_func(void *data) | |
252 | { | |
253 | struct databag *mydata = data; | |
254 | uint8_t buf[BUFSIZE]; | |
255 | uint64_t nb_to_send = 0; | |
256 | int bytes_written; | |
257 | ||
258 | double time_cur, time_last, time_diff; | |
259 | ||
260 | time_last = g_timer_elapsed(mydata->timer, NULL); | |
261 | ||
262 | while (thread_running) { | |
263 | /* Rate control */ | |
264 | time_cur = g_timer_elapsed(mydata->timer, NULL); | |
265 | ||
266 | time_diff = time_cur - time_last; | |
267 | time_last = time_cur; | |
268 | ||
269 | nb_to_send = cur_samplerate * time_diff; | |
270 | ||
271 | if (limit_samples) | |
272 | nb_to_send = MIN(nb_to_send, | |
273 | limit_samples - mydata->samples_counter); | |
274 | ||
275 | /* Make sure we don't overflow. */ | |
276 | nb_to_send = MIN(nb_to_send, BUFSIZE); | |
277 | ||
278 | if (nb_to_send) { | |
279 | samples_generator(buf, nb_to_send, data); | |
280 | mydata->samples_counter += nb_to_send; | |
281 | ||
282 | g_io_channel_write_chars(channels[1], (gchar *)&buf, | |
283 | nb_to_send, (gsize *)&bytes_written, NULL); | |
284 | } | |
285 | ||
286 | /* Check if we're done. */ | |
287 | if ((limit_msec && time_cur * 1000 > limit_msec) || | |
288 | (limit_samples && mydata->samples_counter >= limit_samples)) | |
289 | { | |
290 | close(mydata->pipe_fds[1]); | |
291 | thread_running = 0; | |
292 | } | |
293 | ||
294 | g_usleep(10); | |
295 | } | |
296 | } | |
297 | ||
298 | /* Callback handling data */ | |
299 | static int receive_data(int fd, int revents, void *user_data) | |
300 | { | |
301 | struct sr_datafeed_packet packet; | |
302 | char c[BUFSIZE]; | |
303 | gsize z; | |
304 | ||
305 | /* Avoid compiler warnings. */ | |
306 | fd = fd; | |
307 | revents = revents; | |
308 | ||
309 | do { | |
310 | g_io_channel_read_chars(channels[0], | |
311 | (gchar *)&c, BUFSIZE, &z, NULL); | |
312 | ||
313 | if (z > 0) { | |
314 | packet.type = SR_DF_LOGIC; | |
315 | packet.length = z; | |
316 | packet.unitsize = 1; | |
317 | packet.payload = c; | |
318 | sr_session_bus(user_data, &packet); | |
319 | } | |
320 | } while (z > 0); | |
321 | ||
322 | if (!thread_running && z <= 0) | |
323 | { | |
324 | /* Make sure we don't receive more packets */ | |
325 | g_io_channel_close(channels[0]); | |
326 | ||
327 | /* Send last packet. */ | |
328 | packet.type = SR_DF_END; | |
329 | sr_session_bus(user_data, &packet); | |
330 | ||
331 | return FALSE; | |
332 | } | |
333 | ||
334 | return TRUE; | |
335 | } | |
336 | ||
337 | static int hw_start_acquisition(int device_index, gpointer session_device_id) | |
338 | { | |
339 | struct sr_datafeed_packet *packet; | |
340 | struct sr_datafeed_header *header; | |
341 | struct databag *mydata; | |
342 | ||
343 | mydata = malloc(sizeof(struct databag)); | |
344 | if (!mydata) | |
345 | return SR_ERR_MALLOC; | |
346 | ||
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; | |
351 | ||
352 | if (pipe(mydata->pipe_fds)) | |
353 | return SR_ERR; | |
354 | ||
355 | channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]); | |
356 | channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]); | |
357 | ||
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); | |
361 | ||
362 | /* Make channels to unbuffered. */ | |
363 | g_io_channel_set_buffered(channels[0], FALSE); | |
364 | g_io_channel_set_buffered(channels[1], FALSE); | |
365 | ||
366 | sr_source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40, | |
367 | receive_data, session_device_id); | |
368 | ||
369 | /* Run the demo thread. */ | |
370 | g_thread_init(NULL); | |
371 | /* this needs to be done between g_thread_init() and g_thread_create() */ | |
372 | mydata->timer = g_timer_new(); | |
373 | thread_running = 1; | |
374 | my_thread = | |
375 | g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL); | |
376 | if (!my_thread) | |
377 | return SR_ERR; | |
378 | ||
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; | |
383 | ||
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); | |
394 | free(header); | |
395 | free(packet); | |
396 | ||
397 | return SR_OK; | |
398 | } | |
399 | ||
400 | static void hw_stop_acquisition(int device_index, gpointer session_device_id) | |
401 | { | |
402 | /* Avoid compiler warnings. */ | |
403 | device_index = device_index; | |
404 | session_device_id = session_device_id; | |
405 | ||
406 | /* Stop generate thread. */ | |
407 | thread_running = 0; | |
408 | } | |
409 | ||
410 | struct sr_device_plugin demo_plugin_info = { | |
411 | "demo", | |
412 | "Demo driver and pattern generator", | |
413 | 1, | |
414 | hw_init, | |
415 | hw_cleanup, | |
416 | hw_opendev, | |
417 | hw_closedev, | |
418 | hw_get_device_info, | |
419 | hw_get_status, | |
420 | hw_get_capabilities, | |
421 | hw_set_configuration, | |
422 | hw_start_acquisition, | |
423 | hw_stop_acquisition, | |
424 | }; |