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