hardware/openbench-logic-sniffer/protocol.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "protocol.h"
  21
  22 SR_PRIV struct sr_dev_driver ols_driver_info;
  23 static struct sr_dev_driver *di = &ols_driver_info;
  24
  25 SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
  26                 uint8_t command)
  27 {
  28         char buf[1];
  29
  30         sr_dbg("Sending cmd 0x%.2x.", command);
  31         buf[0] = command;
  32         if (serial_write(serial, buf, 1) != 1)
  33                 return SR_ERR;
  34
  35         return SR_OK;
  36 }
  37
  38 SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
  39                 uint8_t command, uint32_t data)
  40 {
  41         char buf[5];
  42
  43         sr_dbg("Sending cmd 0x%.2x data 0x%.8x.", command, data);
  44         buf[0] = command;
  45         buf[1] = (data & 0xff000000) >> 24;
  46         buf[2] = (data & 0xff0000) >> 16;
  47         buf[3] = (data & 0xff00) >> 8;
  48         buf[4] = data & 0xff;
  49         if (serial_write(serial, buf, 5) != 5)
  50                 return SR_ERR;
  51
  52         return SR_OK;
  53 }
  54
  55 SR_PRIV int ols_configure_probes(const struct sr_dev_inst *sdi)
  56 {
  57         struct dev_context *devc;
  58         const struct sr_probe *probe;
  59         const GSList *l;
  60         int probe_bit, stage, i;
  61         char *tc;
  62
  63         devc = sdi->priv;
  64
  65         devc->probe_mask = 0;
  66         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
  67                 devc->trigger_mask[i] = 0;
  68                 devc->trigger_value[i] = 0;
  69         }
  70
  71         devc->num_stages = 0;
  72         for (l = sdi->probes; l; l = l->next) {
  73                 probe = (const struct sr_probe *)l->data;
  74                 if (!probe->enabled)
  75                         continue;
  76
  77                 /*
  78                  * Set up the probe mask for later configuration into the
  79                  * flag register.
  80                  */
  81                 probe_bit = 1 << (probe->index);
  82                 devc->probe_mask |= probe_bit;
  83
  84                 if (!probe->trigger)
  85                         continue;
  86
  87                 /* Configure trigger mask and value. */
  88                 stage = 0;
  89                 for (tc = probe->trigger; tc && *tc; tc++) {
  90                         devc->trigger_mask[stage] |= probe_bit;
  91                         if (*tc == '1')
  92                                 devc->trigger_value[stage] |= probe_bit;
  93                         stage++;
  94                         if (stage > 3)
  95                                 /*
  96                                  * TODO: Only supporting parallel mode, with
  97                                  * up to 4 stages.
  98                                  */
  99                                 return SR_ERR;
 100                 }
 101                 if (stage > devc->num_stages)
 102                         devc->num_stages = stage;
 103         }
 104
 105         return SR_OK;
 106 }
 107
 108 SR_PRIV uint32_t reverse16(uint32_t in)
 109 {
 110         uint32_t out;
 111
 112         out = (in & 0xff) << 8;
 113         out |= (in & 0xff00) >> 8;
 114         out |= (in & 0xff0000) << 8;
 115         out |= (in & 0xff000000) >> 8;
 116
 117         return out;
 118 }
 119
 120 SR_PRIV uint32_t reverse32(uint32_t in)
 121 {
 122         uint32_t out;
 123
 124         out = (in & 0xff) << 24;
 125         out |= (in & 0xff00) << 8;
 126         out |= (in & 0xff0000) >> 8;
 127         out |= (in & 0xff000000) >> 24;
 128
 129         return out;
 130 }
 131
 132 SR_PRIV struct dev_context *ols_dev_new(void)
 133 {
 134         struct dev_context *devc;
 135
 136         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 137                 sr_err("Device context malloc failed.");
 138                 return NULL;
 139         }
 140
 141         devc->trigger_at = -1;
 142         devc->probe_mask = 0xffffffff;
 143         devc->cur_samplerate = SR_KHZ(200);
 144         devc->serial = NULL;
 145
 146         return devc;
 147 }
 148
 149 SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
 150 {
 151         struct sr_dev_inst *sdi;
 152         struct dev_context *devc;
 153         struct sr_probe *probe;
 154         uint32_t tmp_int, ui;
 155         uint8_t key, type, token;
 156         GString *tmp_str, *devname, *version;
 157         guchar tmp_c;
 158
 159         sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, NULL, NULL, NULL);
 160         sdi->driver = di;
 161         devc = ols_dev_new();
 162         sdi->priv = devc;
 163
 164         devname = g_string_new("");
 165         version = g_string_new("");
 166
 167         key = 0xff;
 168         while (key) {
 169                 if (serial_read(serial, &key, 1) != 1 || key == 0x00)
 170                         break;
 171                 type = key >> 5;
 172                 token = key & 0x1f;
 173                 switch (type) {
 174                 case 0:
 175                         /* NULL-terminated string */
 176                         tmp_str = g_string_new("");
 177                         while (serial_read(serial, &tmp_c, 1) == 1 && tmp_c != '\0')
 178                                 g_string_append_c(tmp_str, tmp_c);
 179                         sr_dbg("Got metadata key 0x%.2x value '%s'.",
 180                                key, tmp_str->str);
 181                         switch (token) {
 182                         case 0x01:
 183                                 /* Device name */
 184                                 devname = g_string_append(devname, tmp_str->str);
 185                                 break;
 186                         case 0x02:
 187                                 /* FPGA firmware version */
 188                                 if (version->len)
 189                                         g_string_append(version, ", ");
 190                                 g_string_append(version, "FPGA version ");
 191                                 g_string_append(version, tmp_str->str);
 192                                 break;
 193                         case 0x03:
 194                                 /* Ancillary version */
 195                                 if (version->len)
 196                                         g_string_append(version, ", ");
 197                                 g_string_append(version, "Ancillary version ");
 198                                 g_string_append(version, tmp_str->str);
 199                                 break;
 200                         default:
 201                                 sr_info("ols: unknown token 0x%.2x: '%s'",
 202                                         token, tmp_str->str);
 203                                 break;
 204                         }
 205                         g_string_free(tmp_str, TRUE);
 206                         break;
 207                 case 1:
 208                         /* 32-bit unsigned integer */
 209                         if (serial_read(serial, &tmp_int, 4) != 4)
 210                                 break;
 211                         tmp_int = reverse32(tmp_int);
 212                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 213                                key, tmp_int);
 214                         switch (token) {
 215                         case 0x00:
 216                                 /* Number of usable probes */
 217                                 for (ui = 0; ui < tmp_int; ui++) {
 218                                         if (!(probe = sr_probe_new(ui, SR_PROBE_LOGIC, TRUE,
 219                                                         ols_probe_names[ui])))
 220                                                 return 0;
 221                                         sdi->probes = g_slist_append(sdi->probes, probe);
 222                                 }
 223                                 break;
 224                         case 0x01:
 225                                 /* Amount of sample memory available (bytes) */
 226                                 devc->max_samples = tmp_int;
 227                                 break;
 228                         case 0x02:
 229                                 /* Amount of dynamic memory available (bytes) */
 230                                 /* what is this for? */
 231                                 break;
 232                         case 0x03:
 233                                 /* Maximum sample rate (hz) */
 234                                 devc->max_samplerate = tmp_int;
 235                                 break;
 236                         case 0x04:
 237                                 /* protocol version */
 238                                 devc->protocol_version = tmp_int;
 239                                 break;
 240                         default:
 241                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 242                                         token, tmp_int);
 243                                 break;
 244                         }
 245                         break;
 246                 case 2:
 247                         /* 8-bit unsigned integer */
 248                         if (serial_read(serial, &tmp_c, 1) != 1)
 249                                 break;
 250                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 251                                key, tmp_c);
 252                         switch (token) {
 253                         case 0x00:
 254                                 /* Number of usable probes */
 255                                 for (ui = 0; ui < tmp_c; ui++) {
 256                                         if (!(probe = sr_probe_new(ui, SR_PROBE_LOGIC, TRUE,
 257                                                         ols_probe_names[ui])))
 258                                                 return 0;
 259                                         sdi->probes = g_slist_append(sdi->probes, probe);
 260                                 }
 261                                 break;
 262                         case 0x01:
 263                                 /* protocol version */
 264                                 devc->protocol_version = tmp_c;
 265                                 break;
 266                         default:
 267                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 268                                         token, tmp_c);
 269                                 break;
 270                         }
 271                         break;
 272                 default:
 273                         /* unknown type */
 274                         break;
 275                 }
 276         }
 277
 278         sdi->model = devname->str;
 279         sdi->version = version->str;
 280         g_string_free(devname, FALSE);
 281         g_string_free(version, FALSE);
 282
 283         return sdi;
 284 }
 285
 286 SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
 287                                uint64_t samplerate,
 288                                const struct sr_samplerates *samplerates)
 289 {
 290         struct dev_context *devc;
 291
 292         devc = sdi->priv;
 293         if (devc->max_samplerate) {
 294                 if (samplerate > devc->max_samplerate)
 295                         return SR_ERR_SAMPLERATE;
 296         } else if (samplerate < samplerates->low || samplerate > samplerates->high)
 297                 return SR_ERR_SAMPLERATE;
 298
 299         if (samplerate > CLOCK_RATE) {
 300                 devc->flag_reg |= FLAG_DEMUX;
 301                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 302         } else {
 303                 devc->flag_reg &= ~FLAG_DEMUX;
 304                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 305         }
 306
 307         /* Calculate actual samplerate used and complain if it is different
 308          * from the requested.
 309          */
 310         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 311         if (devc->flag_reg & FLAG_DEMUX)
 312                 devc->cur_samplerate *= 2;
 313         if (devc->cur_samplerate != samplerate)
 314                 sr_err("Can't match samplerate %" PRIu64 ", using %"
 315                        PRIu64 ".", samplerate, devc->cur_samplerate);
 316
 317         return SR_OK;
 318 }
 319
 320 SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
 321 {
 322         struct sr_datafeed_packet packet;
 323         struct dev_context *devc;
 324
 325         devc = sdi->priv;
 326         sr_source_remove(devc->serial->fd);
 327
 328         /* Terminate session */
 329         packet.type = SR_DF_END;
 330         sr_session_send(sdi, &packet);
 331 }
 332
 333 SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
 334 {
 335         struct sr_datafeed_packet packet;
 336         struct sr_datafeed_logic logic;
 337         struct sr_dev_inst *sdi;
 338         struct drv_context *drvc;
 339         struct dev_context *devc;
 340         GSList *l;
 341         int num_channels, offset, i, j;
 342         unsigned char byte;
 343
 344         drvc = di->priv;
 345
 346         /* Find this device's devc struct by its fd. */
 347         devc = NULL;
 348         for (l = drvc->instances; l; l = l->next) {
 349                 sdi = l->data;
 350                 devc = sdi->priv;
 351                 if (devc->serial->fd == fd)
 352                         break;
 353                 devc = NULL;
 354         }
 355         if (!devc)
 356                 /* Shouldn't happen. */
 357                 return TRUE;
 358
 359         if (devc->num_transfers++ == 0) {
 360                 /*
 361                  * First time round, means the device started sending data,
 362                  * and will not stop until done. If it stops sending for
 363                  * longer than it takes to send a byte, that means it's
 364                  * finished. We'll double that to 30ms to be sure...
 365                  */
 366                 sr_source_remove(fd);
 367                 sr_source_add(fd, G_IO_IN, 30, ols_receive_data, cb_data);
 368                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 369                 if (!devc->raw_sample_buf) {
 370                         sr_err("Sample buffer malloc failed.");
 371                         return FALSE;
 372                 }
 373                 /* fill with 1010... for debugging */
 374                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 375         }
 376
 377         num_channels = 0;
 378         for (i = 0x20; i > 0x02; i /= 2) {
 379                 if ((devc->flag_reg & i) == 0)
 380                         num_channels++;
 381         }
 382
 383         if (revents == G_IO_IN) {
 384                 if (serial_read(devc->serial, &byte, 1) != 1)
 385                         return FALSE;
 386
 387                 /* Ignore it if we've read enough. */
 388                 if (devc->num_samples >= devc->limit_samples)
 389                         return TRUE;
 390
 391                 devc->sample[devc->num_bytes++] = byte;
 392                 sr_dbg("Received byte 0x%.2x.", byte);
 393                 if (devc->num_bytes == num_channels) {
 394                         /* Got a full sample. */
 395                         sr_dbg("Received sample 0x%.*x.",
 396                                devc->num_bytes * 2, *(int *)devc->sample);
 397                         if (devc->flag_reg & FLAG_RLE) {
 398                                 /*
 399                                  * In RLE mode -1 should never come in as a
 400                                  * sample, because bit 31 is the "count" flag.
 401                                  */
 402                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 403                                         devc->sample[devc->num_bytes - 1] &= 0x7f;
 404                                         /*
 405                                          * FIXME: This will only work on
 406                                          * little-endian systems.
 407                                          */
 408                                         devc->rle_count = *(int *)(devc->sample);
 409                                         sr_dbg("RLE count: %d.", devc->rle_count);
 410                                         devc->num_bytes = 0;
 411                                         return TRUE;
 412                                 }
 413                         }
 414                         devc->num_samples += devc->rle_count + 1;
 415                         if (devc->num_samples > devc->limit_samples) {
 416                                 /* Save us from overrunning the buffer. */
 417                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 418                                 devc->num_samples = devc->limit_samples;
 419                         }
 420
 421                         if (num_channels < 4) {
 422                                 /*
 423                                  * Some channel groups may have been turned
 424                                  * off, to speed up transfer between the
 425                                  * hardware and the PC. Expand that here before
 426                                  * submitting it over the session bus --
 427                                  * whatever is listening on the bus will be
 428                                  * expecting a full 32-bit sample, based on
 429                                  * the number of probes.
 430                                  */
 431                                 j = 0;
 432                                 memset(devc->tmp_sample, 0, 4);
 433                                 for (i = 0; i < 4; i++) {
 434                                         if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 435                                                 /*
 436                                                  * This channel group was
 437                                                  * enabled, copy from received
 438                                                  * sample.
 439                                                  */
 440                                                 devc->tmp_sample[i] = devc->sample[j++];
 441                                         }
 442                                 }
 443                                 memcpy(devc->sample, devc->tmp_sample, 4);
 444                                 sr_dbg("Full sample: 0x%.8x.", *(int *)devc->sample);
 445                         }
 446
 447                         /* the OLS sends its sample buffer backwards.
 448                          * store it in reverse order here, so we can dump
 449                          * this on the session bus later.
 450                          */
 451                         offset = (devc->limit_samples - devc->num_samples) * 4;
 452                         for (i = 0; i <= devc->rle_count; i++) {
 453                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 454                                        devc->sample, 4);
 455                         }
 456                         memset(devc->sample, 0, 4);
 457                         devc->num_bytes = 0;
 458                         devc->rle_count = 0;
 459                 }
 460         } else {
 461                 /*
 462                  * This is the main loop telling us a timeout was reached, or
 463                  * we've acquired all the samples we asked for -- we're done.
 464                  * Send the (properly-ordered) buffer to the frontend.
 465                  */
 466                 if (devc->trigger_at != -1) {
 467                         /* a trigger was set up, so we need to tell the frontend
 468                          * about it.
 469                          */
 470                         if (devc->trigger_at > 0) {
 471                                 /* there are pre-trigger samples, send those first */
 472                                 packet.type = SR_DF_LOGIC;
 473                                 packet.payload = &logic;
 474                                 logic.length = devc->trigger_at * 4;
 475                                 logic.unitsize = 4;
 476                                 logic.data = devc->raw_sample_buf +
 477                                         (devc->limit_samples - devc->num_samples) * 4;
 478                                 sr_session_send(cb_data, &packet);
 479                         }
 480
 481                         /* send the trigger */
 482                         packet.type = SR_DF_TRIGGER;
 483                         sr_session_send(cb_data, &packet);
 484
 485                         /* send post-trigger samples */
 486                         packet.type = SR_DF_LOGIC;
 487                         packet.payload = &logic;
 488                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 489                         logic.unitsize = 4;
 490                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 491                                 (devc->limit_samples - devc->num_samples) * 4;
 492                         sr_session_send(cb_data, &packet);
 493                 } else {
 494                         /* no trigger was used */
 495                         packet.type = SR_DF_LOGIC;
 496                         packet.payload = &logic;
 497                         logic.length = devc->num_samples * 4;
 498                         logic.unitsize = 4;
 499                         logic.data = devc->raw_sample_buf +
 500                                 (devc->limit_samples - devc->num_samples) * 4;
 501                         sr_session_send(cb_data, &packet);
 502                 }
 503                 g_free(devc->raw_sample_buf);
 504
 505                 serial_flush(devc->serial);
 506                 abort_acquisition(sdi);
 507                 serial_close(devc->serial);
 508         }
 509
 510         return TRUE;
 511 }