hardware/demo/demo.c

   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 #define DEMO_ANALOG
  23
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <string.h>
  27 #include <sigrok.h>
  28 #include <math.h>
  29 #ifdef _WIN32
  30 #include <io.h>
  31 #include <fcntl.h>
  32 #define pipe(fds) _pipe(fds, 4096, _O_BINARY)
  33 #endif
  34 #include "config.h"
  35
  36 #ifdef DEMO_ANALOG
  37 #define NUM_PROBES             9
  38 #else
  39 #define NUM_PROBES             8
  40 #endif
  41 #define DEMONAME               "Demo device"
  42 /* size of chunks to send through the session bus */
  43 #ifdef DEMO_ANALOG
  44 #define BUFSIZE                32768
  45 #else
  46 #define BUFSIZE                4096
  47 #endif
  48
  49 enum {
  50         GENMODE_DEFAULT,
  51         GENMODE_RANDOM,
  52         GENMODE_INC,
  53         GENMODE_SINE,
  54 };
  55
  56 GIOChannel *channels[2];
  57
  58 struct databag {
  59         int pipe_fds[2];
  60         uint8_t sample_generator;
  61         uint8_t thread_running;
  62         uint64_t samples_counter;
  63         int device_index;
  64         gpointer session_device_id;
  65         GTimer *timer;
  66 };
  67
  68 static int capabilities[] = {
  69         HWCAP_LOGIC_ANALYZER,
  70         HWCAP_PATTERN_MODE,
  71         HWCAP_LIMIT_SAMPLES,
  72         HWCAP_LIMIT_MSEC,
  73         HWCAP_CONTINUOUS
  74 };
  75
  76 static const char *patternmodes[] = {
  77         "random",
  78         "incremental",
  79         "sine",
  80         NULL,
  81 };
  82
  83 #ifndef DEMO_ANALOG
  84 static uint8_t genmode_default[] = {
  85         0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
  86         0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
  87         0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
  88         0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
  89         0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
  90         0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
  91         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  92         0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  93 };
  94 #endif
  95
  96 /* List of struct sigrok_device_instance, maintained by opendev()/closedev(). */
  97 static GSList *device_instances = NULL;
  98 static uint64_t cur_samplerate = KHZ(200);
  99 static uint64_t limit_samples = 0;
 100 static uint64_t limit_msec = 0;
 101 static int default_genmode = GENMODE_DEFAULT;
 102 static GThread *my_thread;
 103 static int thread_running;
 104
 105 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
 106
 107 static int hw_init(char *deviceinfo)
 108 {
 109         struct sigrok_device_instance *sdi;
 110
 111         /* Avoid compiler warnings. */
 112         deviceinfo = deviceinfo;
 113
 114         sdi = sigrok_device_instance_new(0, ST_ACTIVE, DEMONAME, NULL, NULL);
 115         if (!sdi)
 116                 return 0;
 117
 118         device_instances = g_slist_append(device_instances, sdi);
 119
 120         return 1;
 121 }
 122
 123 static int hw_opendev(int device_index)
 124 {
 125         /* Avoid compiler warnings. */
 126         device_index = device_index;
 127
 128         /* Nothing needed so far. */
 129         return SIGROK_OK;
 130 }
 131
 132 static void hw_closedev(int device_index)
 133 {
 134         /* Avoid compiler warnings. */
 135         device_index = device_index;
 136
 137         /* Nothing needed so far. */
 138 }
 139
 140 static void hw_cleanup(void)
 141 {
 142         /* Nothing needed so far. */
 143 }
 144
 145 static void *hw_get_device_info(int device_index, int device_info_id)
 146 {
 147         struct sigrok_device_instance *sdi;
 148         void *info = NULL;
 149
 150         if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
 151                 return NULL;
 152
 153         switch (device_info_id) {
 154         case DI_INSTANCE:
 155                 info = sdi;
 156                 break;
 157         case DI_NUM_PROBES:
 158                 info = GINT_TO_POINTER(NUM_PROBES);
 159                 break;
 160         case DI_CUR_SAMPLERATE:
 161                 info = &cur_samplerate;
 162                 break;
 163         case DI_PATTERNMODES:
 164                 info = &patternmodes;
 165                 break;
 166         }
 167
 168         return info;
 169 }
 170
 171 static int hw_get_status(int device_index)
 172 {
 173         /* Avoid compiler warnings. */
 174         device_index = device_index;
 175
 176         return ST_ACTIVE;
 177 }
 178
 179 static int *hw_get_capabilities(void)
 180 {
 181         return capabilities;
 182 }
 183
 184 static int hw_set_configuration(int device_index, int capability, void *value)
 185 {
 186         int ret;
 187         uint64_t *tmp_u64;
 188         char *stropt;
 189
 190         /* Avoid compiler warnings. */
 191         device_index = device_index;
 192
 193         if (capability == HWCAP_PROBECONFIG) {
 194                 /* Nothing to do. */
 195                 ret = SIGROK_OK;
 196         } else if (capability == HWCAP_LIMIT_SAMPLES) {
 197                 tmp_u64 = value;
 198                 limit_samples = *tmp_u64;
 199                 ret = SIGROK_OK;
 200         } else if (capability == HWCAP_LIMIT_MSEC) {
 201                 tmp_u64 = value;
 202                 limit_msec = *tmp_u64;
 203                 ret = SIGROK_OK;
 204         } else if (capability == HWCAP_PATTERN_MODE) {
 205                 stropt = value;
 206                 if (!strcmp(stropt, "random")) {
 207                         default_genmode = GENMODE_RANDOM;
 208                         ret = SIGROK_OK;
 209                 } else if (!strcmp(stropt, "incremental")) {
 210                         default_genmode = GENMODE_INC;
 211                         ret = SIGROK_OK;
 212                 } else if (!strcmp(stropt, "sine")) {
 213                         default_genmode = GENMODE_SINE;
 214                         ret = SIGROK_OK;
 215                 } else {
 216                         ret = SIGROK_ERR;
 217                 }
 218         } else {
 219                 ret = SIGROK_ERR;
 220         }
 221
 222         return ret;
 223 }
 224
 225 static void samples_generator(uint8_t *buf, uint64_t size, void *data)
 226 {
 227         struct databag *mydata = data;
 228         uint64_t p, i;
 229 #ifdef DEMO_ANALOG
 230         /*
 231          * We will simulate a device with 8 logic probes and 1 analog probe.
 232          * This fictional device sends the data packed: 8 bits for 8 logic
 233          * probes and 16 bits for the analog probe, in this order.
 234          * Total of 24 bits.
 235          * I could just generate a properly formatted DF_ANALOG packet here,
 236          * but I will leave the formatting to receive_data() to make its code
 237          * more like a real hardware driver.
 238          */
 239         memset(buf, 0, size * 3);
 240
 241         switch (mydata->sample_generator) {
 242         default:
 243         case GENMODE_DEFAULT:
 244         case GENMODE_SINE:
 245                 for (i = 0; i < size * 3; i += 3) {
 246                         *(buf + i) = i / 3;
 247                         *(uint16_t *) (buf + i + 1) =
 248                                 (uint16_t) (sin(i / 3) * 256 * 30);
 249                 }
 250                 break;
 251         case GENMODE_RANDOM:
 252                 for (i = 0; i < size * 3; i += 3) {
 253                         *(buf + i) = (uint8_t)(rand() & 0xff);
 254                         *(uint16_t *) (buf + i + 1) = (uint16_t)(rand() & 0xffff);
 255                 }
 256                 break;
 257         case GENMODE_INC:
 258                 for (i = 0; i < size * 3; i += 3) {
 259                         *(buf + i) = i / 3;
 260                         *(uint16_t *)(buf + i + 1) = i / 3 * 256 * 10;
 261                 }
 262                 break;
 263         }
 264 #else
 265
 266         memset(buf, 0, size);
 267
 268         switch (mydata->sample_generator) {
 269         case GENMODE_DEFAULT:
 270                 p = 0;
 271                 for (i = 0; i < size; i++) {
 272                         *(buf + i) = ~(genmode_default[p] >> 1);
 273                         if (++p == 64)
 274                                 p = 0;
 275                 }
 276                 break;
 277         case GENMODE_RANDOM: /* Random */
 278                 for (i = 0; i < size; i++)
 279                         *(buf + i) = (uint8_t)(rand() & 0xff);
 280                 break;
 281         case GENMODE_INC: /* Simple increment */
 282                 for (i = 0; i < size; i++)
 283                         *(buf + i) = i;
 284                 break;
 285         }
 286 #endif
 287 }
 288
 289 /* Thread function */
 290 static void thread_func(void *data)
 291 {
 292         struct databag *mydata = data;
 293         uint8_t buf[BUFSIZE];
 294         uint64_t nb_to_send = 0;
 295         int bytes_written;
 296
 297         double time_cur, time_last, time_diff;
 298
 299         time_last = g_timer_elapsed(mydata->timer, NULL);
 300
 301         while (thread_running) {
 302                 /* Rate control */
 303                 time_cur = g_timer_elapsed(mydata->timer, NULL);
 304
 305                 time_diff = time_cur - time_last;
 306                 time_last = time_cur;
 307
 308                 nb_to_send = cur_samplerate * time_diff;
 309
 310                 if (limit_samples)
 311                         nb_to_send = MIN(nb_to_send,
 312                                         limit_samples - mydata->samples_counter);
 313
 314                 /* Make sure we don't overflow. */
 315 #ifdef DEMO_ANALOG
 316                 nb_to_send = MIN(nb_to_send, BUFSIZE / 3);
 317 #else
 318                 nb_to_send = MIN(nb_to_send, BUFSIZE);
 319 #endif
 320
 321                 if (nb_to_send) {
 322                         samples_generator(buf, nb_to_send, data);
 323                         mydata->samples_counter += nb_to_send;
 324 #ifdef DEMO_ANALOG
 325                         g_io_channel_write_chars(channels[1], (gchar *) &buf,
 326                                 nb_to_send * 3, (gsize *) &bytes_written, NULL);
 327 #else
 328                         g_io_channel_write_chars(channels[1], (gchar *) &buf,
 329                                 nb_to_send, (gsize *) &bytes_written, NULL);
 330 #endif
 331                 }
 332
 333                 /* Check if we're done. */
 334                 if ((limit_msec && time_cur * 1000 > limit_msec) ||
 335                     (limit_samples && mydata->samples_counter >= limit_samples))
 336                 {
 337                         close(mydata->pipe_fds[1]);
 338                         thread_running = 0;
 339                 }
 340
 341                 g_usleep(10);
 342         }
 343 }
 344
 345 /* Callback handling data */
 346 static int receive_data(int fd, int revents, void *user_data)
 347 {
 348         struct datafeed_packet packet;
 349         char c[BUFSIZE];
 350         uint64_t z;
 351 #ifdef DEMO_ANALOG
 352         struct analog_sample *sample;
 353         unsigned int i, x;
 354         int sample_size = sizeof(struct analog_sample) +
 355                 (NUM_PROBES * sizeof(struct analog_probe));
 356         char *buf;
 357 #endif
 358
 359         /* Avoid compiler warnings. */
 360         fd = fd;
 361         revents = revents;
 362
 363         do {
 364                 g_io_channel_read_chars(channels[0],
 365                                         (gchar *) &c, BUFSIZE, (gsize *) &z, NULL);
 366
 367                 if (z > 0) {
 368 #ifdef DEMO_ANALOG
 369                         packet.type = DF_ANALOG;
 370
 371                         packet.length = (z / 3) * sample_size;
 372                         packet.unitsize = sample_size;
 373
 374                         buf = malloc(sample_size * packet.length);
 375                         if (!buf)
 376                                 return FALSE;
 377
 378                         /* Craft our packet. */
 379                         for (i = 0; i < z / 3; i++) {
 380                                 sample = (struct analog_sample *) (buf + (i * sample_size));
 381                                 sample->num_probes = NUM_PROBES;
 382
 383                                 /* 8 Logic probes */
 384                                 for (x = 0; x < NUM_PROBES - 1; x++) {
 385                                         sample->probes[x].val =
 386                                                 (c[i * 3] >> x) & 1;
 387                                         sample->probes[x].res = 1;
 388                                 }
 389
 390                                 /* 1 Analog probe, 16 bit adc */
 391                                 for (; x < NUM_PROBES; x++) {
 392                                         sample->probes[x].val =
 393                                                 *(uint16_t *) (c + i * 3 + 1);
 394                                         sample->probes[x].val &= ((1 << 16) - 1);
 395                                         sample->probes[x].res = 16;
 396                                 }
 397
 398                         }
 399
 400                         packet.payload = buf;
 401                         session_bus(user_data, &packet);
 402                         free(buf);
 403 #else
 404                         packet.type = DF_LOGIC;
 405                         packet.length = z;
 406                         packet.unitsize = 1;
 407                         packet.payload = c;
 408                         session_bus(user_data, &packet);
 409 #endif
 410                 }
 411         } while (z > 0);
 412
 413         if (!thread_running && z <= 0)
 414         {
 415                 /* Make sure we don't receive more packets */
 416                 g_io_channel_close(channels[0]);
 417
 418                 /* Send last packet. */
 419                 packet.type = DF_END;
 420                 session_bus(user_data, &packet);
 421
 422                 return FALSE;
 423         }
 424
 425         return TRUE;
 426 }
 427
 428 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 429 {
 430         struct datafeed_packet *packet;
 431         struct datafeed_header *header;
 432         struct databag *mydata;
 433
 434         mydata = malloc(sizeof(struct databag));
 435         if (!mydata)
 436                 return SIGROK_ERR_MALLOC;
 437
 438         mydata->sample_generator = default_genmode;
 439         mydata->session_device_id = session_device_id;
 440         mydata->device_index = device_index;
 441         mydata->samples_counter = 0;
 442
 443         if (pipe(mydata->pipe_fds))
 444                 return SIGROK_ERR;
 445
 446         channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
 447         channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
 448
 449         /* Set channel encoding to binary (default is UTF-8). */
 450         g_io_channel_set_encoding(channels[0], NULL, NULL);
 451         g_io_channel_set_encoding(channels[1], NULL, NULL);
 452
 453         /* Make channels to unbuffered. */
 454         g_io_channel_set_buffered(channels[0], FALSE);
 455         g_io_channel_set_buffered(channels[1], FALSE);
 456
 457         source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40, receive_data,
 458                    session_device_id);
 459
 460         /* Run the demo thread. */
 461         g_thread_init(NULL);
 462         mydata->timer = g_timer_new();
 463         thread_running = 1;
 464         my_thread =
 465             g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
 466         if (!my_thread)
 467                 return SIGROK_ERR;
 468
 469         packet = malloc(sizeof(struct datafeed_packet));
 470         header = malloc(sizeof(struct datafeed_header));
 471         if (!packet || !header)
 472                 return SIGROK_ERR_MALLOC;
 473
 474         packet->type = DF_HEADER;
 475         packet->length = sizeof(struct datafeed_header);
 476         packet->payload = (unsigned char *)header;
 477 #ifdef DEMO_ANALOG
 478         packet->unitsize = sizeof(struct analog_sample) +
 479                 (NUM_PROBES * sizeof(struct analog_probe));
 480 #endif
 481         header->feed_version = 1;
 482         gettimeofday(&header->starttime, NULL);
 483         header->samplerate = cur_samplerate;
 484         header->protocol_id = PROTO_RAW;
 485         header->num_logic_probes = NUM_PROBES;
 486         header->num_analog_probes = 0;
 487         session_bus(session_device_id, packet);
 488         free(header);
 489         free(packet);
 490
 491         return SIGROK_OK;
 492 }
 493
 494 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 495 {
 496         /* Avoid compiler warnings. */
 497         device_index = device_index;
 498         session_device_id = session_device_id;
 499
 500         /* Stop generate thread. */
 501         thread_running = 0;
 502 }
 503
 504 struct device_plugin demo_plugin_info = {
 505         "demo",
 506         1,
 507         hw_init,
 508         hw_cleanup,
 509         hw_opendev,
 510         hw_closedev,
 511         hw_get_device_info,
 512         hw_get_status,
 513         hw_get_capabilities,
 514         hw_set_configuration,
 515         hw_start_acquisition,
 516         hw_stop_acquisition,
 517 };