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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 | #include <sigrok-internal.h> | |
27 | #ifdef _WIN32 | |
28 | #include <io.h> | |
29 | #include <fcntl.h> | |
30 | #define pipe(fds) _pipe(fds, 4096, _O_BINARY) | |
31 | #endif | |
32 | #include "config.h" | |
33 | ||
34 | #define NUM_PROBES 8 | |
35 | #define DEMONAME "Demo device" | |
36 | /* size of chunks to send through the session bus */ | |
37 | #define BUFSIZE 4096 | |
38 | ||
39 | enum { | |
40 | GENMODE_DEFAULT, | |
41 | GENMODE_RANDOM, | |
42 | GENMODE_INC, | |
43 | }; | |
44 | ||
45 | /* FIXME: Should not be global. */ | |
46 | GIOChannel *channels[2]; | |
47 | ||
48 | struct databag { | |
49 | int pipe_fds[2]; | |
50 | uint8_t sample_generator; | |
51 | uint8_t thread_running; | |
52 | uint64_t samples_counter; | |
53 | int device_index; | |
54 | gpointer session_device_id; | |
55 | GTimer *timer; | |
56 | }; | |
57 | ||
58 | static int capabilities[] = { | |
59 | SR_HWCAP_LOGIC_ANALYZER, | |
60 | SR_HWCAP_SAMPLERATE, | |
61 | SR_HWCAP_PATTERN_MODE, | |
62 | SR_HWCAP_LIMIT_SAMPLES, | |
63 | SR_HWCAP_LIMIT_MSEC, | |
64 | SR_HWCAP_CONTINUOUS, | |
65 | }; | |
66 | ||
67 | static struct sr_samplerates samplerates = { | |
68 | SR_HZ(1), | |
69 | SR_GHZ(1), | |
70 | SR_HZ(1), | |
71 | NULL, | |
72 | }; | |
73 | ||
74 | static const char *patternmodes[] = { | |
75 | "random", | |
76 | "incremental", | |
77 | NULL, | |
78 | }; | |
79 | ||
80 | static uint8_t genmode_default[] = { | |
81 | 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00, | |
82 | 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00, | |
83 | 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00, | |
84 | 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00, | |
85 | 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00, | |
86 | 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00, | |
87 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
88 | 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
89 | }; | |
90 | ||
91 | /* List of struct sr_device_instance, maintained by opendev()/closedev(). */ | |
92 | static GSList *device_instances = NULL; | |
93 | static uint64_t cur_samplerate = SR_KHZ(200); | |
94 | static uint64_t limit_samples = 0; | |
95 | static uint64_t limit_msec = 0; | |
96 | static int default_genmode = GENMODE_DEFAULT; | |
97 | static GThread *my_thread; | |
98 | static int thread_running; | |
99 | ||
100 | static void hw_stop_acquisition(int device_index, gpointer session_device_id); | |
101 | ||
102 | static int hw_init(const char *deviceinfo) | |
103 | { | |
104 | struct sr_device_instance *sdi; | |
105 | ||
106 | /* Avoid compiler warnings. */ | |
107 | deviceinfo = deviceinfo; | |
108 | ||
109 | sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL); | |
110 | if (!sdi) | |
111 | return 0; | |
112 | ||
113 | device_instances = g_slist_append(device_instances, sdi); | |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
118 | static int hw_opendev(int device_index) | |
119 | { | |
120 | /* Avoid compiler warnings. */ | |
121 | device_index = device_index; | |
122 | ||
123 | /* Nothing needed so far. */ | |
124 | return SR_OK; | |
125 | } | |
126 | ||
127 | static void hw_closedev(int device_index) | |
128 | { | |
129 | /* Avoid compiler warnings. */ | |
130 | device_index = device_index; | |
131 | ||
132 | /* Nothing needed so far. */ | |
133 | } | |
134 | ||
135 | static void hw_cleanup(void) | |
136 | { | |
137 | /* Nothing needed so far. */ | |
138 | } | |
139 | ||
140 | static void *hw_get_device_info(int device_index, int device_info_id) | |
141 | { | |
142 | struct sr_device_instance *sdi; | |
143 | void *info = NULL; | |
144 | ||
145 | if (!(sdi = sr_get_device_instance(device_instances, device_index))) | |
146 | return NULL; | |
147 | ||
148 | switch (device_info_id) { | |
149 | case SR_DI_INSTANCE: | |
150 | info = sdi; | |
151 | break; | |
152 | case SR_DI_NUM_PROBES: | |
153 | info = GINT_TO_POINTER(NUM_PROBES); | |
154 | break; | |
155 | case SR_DI_SAMPLERATES: | |
156 | info = &samplerates; | |
157 | break; | |
158 | case SR_DI_CUR_SAMPLERATE: | |
159 | info = &cur_samplerate; | |
160 | break; | |
161 | case SR_DI_PATTERNMODES: | |
162 | info = &patternmodes; | |
163 | break; | |
164 | } | |
165 | ||
166 | return info; | |
167 | } | |
168 | ||
169 | static int hw_get_status(int device_index) | |
170 | { | |
171 | /* Avoid compiler warnings. */ | |
172 | device_index = device_index; | |
173 | ||
174 | return SR_ST_ACTIVE; | |
175 | } | |
176 | ||
177 | static int *hw_get_capabilities(void) | |
178 | { | |
179 | return capabilities; | |
180 | } | |
181 | ||
182 | static int hw_set_configuration(int device_index, int capability, void *value) | |
183 | { | |
184 | int ret; | |
185 | uint64_t *tmp_u64; | |
186 | char *stropt; | |
187 | ||
188 | /* Avoid compiler warnings. */ | |
189 | device_index = device_index; | |
190 | ||
191 | if (capability == SR_HWCAP_PROBECONFIG) { | |
192 | /* Nothing to do, but must be supported */ | |
193 | ret = SR_OK; | |
194 | } else if (capability == SR_HWCAP_SAMPLERATE) { | |
195 | tmp_u64 = value; | |
196 | cur_samplerate = *tmp_u64; | |
197 | ret = SR_OK; | |
198 | } else if (capability == SR_HWCAP_LIMIT_SAMPLES) { | |
199 | tmp_u64 = value; | |
200 | limit_samples = *tmp_u64; | |
201 | ret = SR_OK; | |
202 | } else if (capability == SR_HWCAP_LIMIT_MSEC) { | |
203 | tmp_u64 = value; | |
204 | limit_msec = *tmp_u64; | |
205 | ret = SR_OK; | |
206 | } else if (capability == SR_HWCAP_PATTERN_MODE) { | |
207 | stropt = value; | |
208 | if (!strcmp(stropt, "random")) { | |
209 | default_genmode = GENMODE_RANDOM; | |
210 | ret = SR_OK; | |
211 | } else if (!strcmp(stropt, "incremental")) { | |
212 | default_genmode = GENMODE_INC; | |
213 | ret = SR_OK; | |
214 | } else { | |
215 | ret = SR_ERR; | |
216 | } | |
217 | } else { | |
218 | ret = SR_ERR; | |
219 | } | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | static void samples_generator(uint8_t *buf, uint64_t size, void *data) | |
225 | { | |
226 | static uint64_t p = 0; | |
227 | struct databag *mydata = data; | |
228 | uint64_t i; | |
229 | ||
230 | memset(buf, 0, size); | |
231 | ||
232 | switch (mydata->sample_generator) { | |
233 | case GENMODE_DEFAULT: | |
234 | for (i = 0; i < size; i++) { | |
235 | *(buf + i) = ~(genmode_default[p] >> 1); | |
236 | if (++p == 64) | |
237 | p = 0; | |
238 | } | |
239 | break; | |
240 | case GENMODE_RANDOM: /* Random */ | |
241 | for (i = 0; i < size; i++) | |
242 | *(buf + i) = (uint8_t)(rand() & 0xff); | |
243 | break; | |
244 | case GENMODE_INC: /* Simple increment */ | |
245 | for (i = 0; i < size; i++) | |
246 | *(buf + i) = i; | |
247 | break; | |
248 | } | |
249 | } | |
250 | ||
251 | /* Thread function */ | |
252 | static void thread_func(void *data) | |
253 | { | |
254 | struct databag *mydata = data; | |
255 | uint8_t buf[BUFSIZE]; | |
256 | uint64_t nb_to_send = 0; | |
257 | int bytes_written; | |
258 | ||
259 | double time_cur, time_last, time_diff; | |
260 | ||
261 | time_last = g_timer_elapsed(mydata->timer, NULL); | |
262 | ||
263 | while (thread_running) { | |
264 | /* Rate control */ | |
265 | time_cur = g_timer_elapsed(mydata->timer, NULL); | |
266 | ||
267 | time_diff = time_cur - time_last; | |
268 | time_last = time_cur; | |
269 | ||
270 | nb_to_send = cur_samplerate * time_diff; | |
271 | ||
272 | if (limit_samples) | |
273 | nb_to_send = MIN(nb_to_send, | |
274 | limit_samples - mydata->samples_counter); | |
275 | ||
276 | /* Make sure we don't overflow. */ | |
277 | nb_to_send = MIN(nb_to_send, BUFSIZE); | |
278 | ||
279 | if (nb_to_send) { | |
280 | samples_generator(buf, nb_to_send, data); | |
281 | mydata->samples_counter += nb_to_send; | |
282 | ||
283 | g_io_channel_write_chars(channels[1], (gchar *)&buf, | |
284 | nb_to_send, (gsize *)&bytes_written, NULL); | |
285 | } | |
286 | ||
287 | /* Check if we're done. */ | |
288 | if ((limit_msec && time_cur * 1000 > limit_msec) || | |
289 | (limit_samples && mydata->samples_counter >= limit_samples)) | |
290 | { | |
291 | close(mydata->pipe_fds[1]); | |
292 | thread_running = 0; | |
293 | } | |
294 | ||
295 | g_usleep(10); | |
296 | } | |
297 | } | |
298 | ||
299 | /* Callback handling data */ | |
300 | static int receive_data(int fd, int revents, void *user_data) | |
301 | { | |
302 | struct sr_datafeed_packet packet; | |
303 | char c[BUFSIZE]; | |
304 | gsize z; | |
305 | ||
306 | /* Avoid compiler warnings. */ | |
307 | fd = fd; | |
308 | revents = revents; | |
309 | ||
310 | do { | |
311 | g_io_channel_read_chars(channels[0], | |
312 | (gchar *)&c, BUFSIZE, &z, NULL); | |
313 | ||
314 | if (z > 0) { | |
315 | packet.type = SR_DF_LOGIC; | |
316 | packet.length = z; | |
317 | packet.unitsize = 1; | |
318 | packet.payload = c; | |
319 | sr_session_bus(user_data, &packet); | |
320 | } | |
321 | } while (z > 0); | |
322 | ||
323 | if (!thread_running && z <= 0) | |
324 | { | |
325 | /* Make sure we don't receive more packets */ | |
326 | g_io_channel_close(channels[0]); | |
327 | ||
328 | /* Send last packet. */ | |
329 | packet.type = SR_DF_END; | |
330 | sr_session_bus(user_data, &packet); | |
331 | ||
332 | return FALSE; | |
333 | } | |
334 | ||
335 | return TRUE; | |
336 | } | |
337 | ||
338 | static int hw_start_acquisition(int device_index, gpointer session_device_id) | |
339 | { | |
340 | struct sr_datafeed_packet *packet; | |
341 | struct sr_datafeed_header *header; | |
342 | struct databag *mydata; | |
343 | ||
344 | /* TODO: 'mydata' is never g_free()'d? */ | |
345 | if (!(mydata = g_try_malloc(sizeof(struct databag)))) { | |
346 | sr_err("demo: %s: mydata malloc failed", __func__); | |
347 | return SR_ERR_MALLOC; | |
348 | } | |
349 | ||
350 | mydata->sample_generator = default_genmode; | |
351 | mydata->session_device_id = session_device_id; | |
352 | mydata->device_index = device_index; | |
353 | mydata->samples_counter = 0; | |
354 | ||
355 | if (pipe(mydata->pipe_fds)) | |
356 | return SR_ERR; | |
357 | ||
358 | channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]); | |
359 | channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]); | |
360 | ||
361 | /* Set channel encoding to binary (default is UTF-8). */ | |
362 | g_io_channel_set_encoding(channels[0], NULL, NULL); | |
363 | g_io_channel_set_encoding(channels[1], NULL, NULL); | |
364 | ||
365 | /* Make channels to unbuffered. */ | |
366 | g_io_channel_set_buffered(channels[0], FALSE); | |
367 | g_io_channel_set_buffered(channels[1], FALSE); | |
368 | ||
369 | sr_source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40, | |
370 | receive_data, session_device_id); | |
371 | ||
372 | /* Run the demo thread. */ | |
373 | g_thread_init(NULL); | |
374 | /* this needs to be done between g_thread_init() and g_thread_create() */ | |
375 | mydata->timer = g_timer_new(); | |
376 | thread_running = 1; | |
377 | my_thread = | |
378 | g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL); | |
379 | if (!my_thread) | |
380 | return SR_ERR; | |
381 | ||
382 | if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) { | |
383 | sr_err("demo: %s: packet malloc failed", __func__); | |
384 | return SR_ERR_MALLOC; | |
385 | } | |
386 | ||
387 | if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) { | |
388 | sr_err("demo: %s: header malloc failed", __func__); | |
389 | return SR_ERR_MALLOC; | |
390 | } | |
391 | ||
392 | packet->type = SR_DF_HEADER; | |
393 | packet->length = sizeof(struct sr_datafeed_header); | |
394 | packet->payload = (unsigned char *)header; | |
395 | header->feed_version = 1; | |
396 | gettimeofday(&header->starttime, NULL); | |
397 | header->samplerate = cur_samplerate; | |
398 | header->protocol_id = SR_PROTO_RAW; | |
399 | header->num_logic_probes = NUM_PROBES; | |
400 | header->num_analog_probes = 0; | |
401 | sr_session_bus(session_device_id, packet); | |
402 | g_free(header); | |
403 | g_free(packet); | |
404 | ||
405 | return SR_OK; | |
406 | } | |
407 | ||
408 | static void hw_stop_acquisition(int device_index, gpointer session_device_id) | |
409 | { | |
410 | /* Avoid compiler warnings. */ | |
411 | device_index = device_index; | |
412 | session_device_id = session_device_id; | |
413 | ||
414 | /* Stop generate thread. */ | |
415 | thread_running = 0; | |
416 | } | |
417 | ||
418 | struct sr_device_plugin demo_plugin_info = { | |
419 | .name = "demo", | |
420 | .longname = "Demo driver and pattern generator", | |
421 | .api_version = 1, | |
422 | .init = hw_init, | |
423 | .cleanup = hw_cleanup, | |
424 | .open = hw_opendev, | |
425 | .close = hw_closedev, | |
426 | .get_device_info = hw_get_device_info, | |
427 | .get_status = hw_get_status, | |
428 | .get_capabilities = hw_get_capabilities, | |
429 | .set_configuration = hw_set_configuration, | |
430 | .start_acquisition = hw_start_acquisition, | |
431 | .stop_acquisition = hw_stop_acquisition, | |
432 | }; |