hardware/openbench-logic-sniffer/protocol.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2013 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 extern 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_malloc(sizeof(struct dev_context)))) {
 137                 sr_err("Device context malloc failed.");
 138                 return NULL;
 139         }
 140
 141         /* Device-specific settings */
 142         devc->max_samples = devc->max_samplerate = devc->protocol_version = 0;
 143
 144         /* Acquisition settings */
 145         devc->limit_samples = devc->capture_ratio = 0;
 146         devc->trigger_at = -1;
 147         devc->probe_mask = 0xffffffff;
 148         devc->flag_reg = 0;
 149
 150         devc->serial = NULL;
 151
 152         return devc;
 153 }
 154
 155 SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
 156 {
 157         struct sr_dev_inst *sdi;
 158         struct dev_context *devc;
 159         struct sr_probe *probe;
 160         uint32_t tmp_int, ui;
 161         uint8_t key, type, token;
 162         GString *tmp_str, *devname, *version;
 163         guchar tmp_c;
 164
 165         sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, NULL, NULL, NULL);
 166         sdi->driver = di;
 167         devc = ols_dev_new();
 168         sdi->priv = devc;
 169
 170         devname = g_string_new("");
 171         version = g_string_new("");
 172
 173         key = 0xff;
 174         while (key) {
 175                 if (serial_read(serial, &key, 1) != 1 || key == 0x00)
 176                         break;
 177                 type = key >> 5;
 178                 token = key & 0x1f;
 179                 switch (type) {
 180                 case 0:
 181                         /* NULL-terminated string */
 182                         tmp_str = g_string_new("");
 183                         while (serial_read(serial, &tmp_c, 1) == 1 && tmp_c != '\0')
 184                                 g_string_append_c(tmp_str, tmp_c);
 185                         sr_dbg("Got metadata key 0x%.2x value '%s'.",
 186                                key, tmp_str->str);
 187                         switch (token) {
 188                         case 0x01:
 189                                 /* Device name */
 190                                 devname = g_string_append(devname, tmp_str->str);
 191                                 break;
 192                         case 0x02:
 193                                 /* FPGA firmware version */
 194                                 if (version->len)
 195                                         g_string_append(version, ", ");
 196                                 g_string_append(version, "FPGA version ");
 197                                 g_string_append(version, tmp_str->str);
 198                                 break;
 199                         case 0x03:
 200                                 /* Ancillary version */
 201                                 if (version->len)
 202                                         g_string_append(version, ", ");
 203                                 g_string_append(version, "Ancillary version ");
 204                                 g_string_append(version, tmp_str->str);
 205                                 break;
 206                         default:
 207                                 sr_info("ols: unknown token 0x%.2x: '%s'",
 208                                         token, tmp_str->str);
 209                                 break;
 210                         }
 211                         g_string_free(tmp_str, TRUE);
 212                         break;
 213                 case 1:
 214                         /* 32-bit unsigned integer */
 215                         if (serial_read(serial, &tmp_int, 4) != 4)
 216                                 break;
 217                         tmp_int = reverse32(tmp_int);
 218                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 219                                key, tmp_int);
 220                         switch (token) {
 221                         case 0x00:
 222                                 /* Number of usable probes */
 223                                 for (ui = 0; ui < tmp_int; ui++) {
 224                                         if (!(probe = sr_probe_new(ui, SR_PROBE_LOGIC, TRUE,
 225                                                         ols_probe_names[ui])))
 226                                                 return 0;
 227                                         sdi->probes = g_slist_append(sdi->probes, probe);
 228                                 }
 229                                 break;
 230                         case 0x01:
 231                                 /* Amount of sample memory available (bytes) */
 232                                 devc->max_samples = tmp_int;
 233                                 break;
 234                         case 0x02:
 235                                 /* Amount of dynamic memory available (bytes) */
 236                                 /* what is this for? */
 237                                 break;
 238                         case 0x03:
 239                                 /* Maximum sample rate (hz) */
 240                                 devc->max_samplerate = tmp_int;
 241                                 break;
 242                         case 0x04:
 243                                 /* protocol version */
 244                                 devc->protocol_version = tmp_int;
 245                                 break;
 246                         default:
 247                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 248                                         token, tmp_int);
 249                                 break;
 250                         }
 251                         break;
 252                 case 2:
 253                         /* 8-bit unsigned integer */
 254                         if (serial_read(serial, &tmp_c, 1) != 1)
 255                                 break;
 256                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 257                                key, tmp_c);
 258                         switch (token) {
 259                         case 0x00:
 260                                 /* Number of usable probes */
 261                                 for (ui = 0; ui < tmp_c; ui++) {
 262                                         if (!(probe = sr_probe_new(ui, SR_PROBE_LOGIC, TRUE,
 263                                                         ols_probe_names[ui])))
 264                                                 return 0;
 265                                         sdi->probes = g_slist_append(sdi->probes, probe);
 266                                 }
 267                                 break;
 268                         case 0x01:
 269                                 /* protocol version */
 270                                 devc->protocol_version = tmp_c;
 271                                 break;
 272                         default:
 273                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 274                                         token, tmp_c);
 275                                 break;
 276                         }
 277                         break;
 278                 default:
 279                         /* unknown type */
 280                         break;
 281                 }
 282         }
 283
 284         sdi->model = devname->str;
 285         sdi->version = version->str;
 286         g_string_free(devname, FALSE);
 287         g_string_free(version, FALSE);
 288
 289         return sdi;
 290 }
 291
 292 SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
 293                 const uint64_t samplerate)
 294 {
 295         struct dev_context *devc;
 296
 297         devc = sdi->priv;
 298         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 299                 return SR_ERR_SAMPLERATE;
 300
 301         if (samplerate > CLOCK_RATE) {
 302                 devc->flag_reg |= FLAG_DEMUX;
 303                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 304         } else {
 305                 devc->flag_reg &= ~FLAG_DEMUX;
 306                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 307         }
 308
 309         /* Calculate actual samplerate used and complain if it is different
 310          * from the requested.
 311          */
 312         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 313         if (devc->flag_reg & FLAG_DEMUX)
 314                 devc->cur_samplerate *= 2;
 315         if (devc->cur_samplerate != samplerate)
 316                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 317                        PRIu64 ".", samplerate, devc->cur_samplerate);
 318
 319         return SR_OK;
 320 }
 321
 322 SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
 323 {
 324         struct sr_datafeed_packet packet;
 325         struct dev_context *devc;
 326
 327         devc = sdi->priv;
 328         sr_source_remove(devc->serial->fd);
 329
 330         /* Terminate session */
 331         packet.type = SR_DF_END;
 332         sr_session_send(sdi, &packet);
 333 }
 334
 335 SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
 336 {
 337         struct sr_datafeed_packet packet;
 338         struct sr_datafeed_logic logic;
 339         struct sr_dev_inst *sdi;
 340         struct drv_context *drvc;
 341         struct dev_context *devc;
 342         GSList *l;
 343         uint32_t sample;
 344         int num_channels, offset, i, j;
 345         unsigned char byte;
 346
 347         drvc = di->priv;
 348
 349         /* Find this device's devc struct by its fd. */
 350         devc = NULL;
 351         for (l = drvc->instances; l; l = l->next) {
 352                 sdi = l->data;
 353                 devc = sdi->priv;
 354                 if (devc->serial->fd == fd)
 355                         break;
 356                 devc = NULL;
 357         }
 358         if (!devc)
 359                 /* Shouldn't happen. */
 360                 return TRUE;
 361
 362         if (devc->num_transfers++ == 0) {
 363                 /*
 364                  * First time round, means the device started sending data,
 365                  * and will not stop until done. If it stops sending for
 366                  * longer than it takes to send a byte, that means it's
 367                  * finished. We'll double that to 30ms to be sure...
 368                  */
 369                 sr_source_remove(fd);
 370                 sr_source_add(fd, G_IO_IN, 30, ols_receive_data, cb_data);
 371                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 372                 if (!devc->raw_sample_buf) {
 373                         sr_err("Sample buffer malloc failed.");
 374                         return FALSE;
 375                 }
 376                 /* fill with 1010... for debugging */
 377                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 378         }
 379
 380         num_channels = 0;
 381         for (i = 0x20; i > 0x02; i /= 2) {
 382                 if ((devc->flag_reg & i) == 0)
 383                         num_channels++;
 384         }
 385
 386         if (revents == G_IO_IN) {
 387                 if (serial_read(devc->serial, &byte, 1) != 1)
 388                         return FALSE;
 389
 390                 /* Ignore it if we've read enough. */
 391                 if (devc->num_samples >= devc->limit_samples)
 392                         return TRUE;
 393
 394                 devc->sample[devc->num_bytes++] = byte;
 395                 sr_dbg("Received byte 0x%.2x.", byte);
 396                 if (devc->num_bytes == num_channels) {
 397                         /* Got a full sample. */
 398                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 399                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 400                         sr_dbg("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 401                         if (devc->flag_reg & FLAG_RLE) {
 402                                 /*
 403                                  * In RLE mode -1 should never come in as a
 404                                  * sample, because bit 31 is the "count" flag.
 405                                  */
 406                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 407                                         devc->sample[devc->num_bytes - 1] &= 0x7f;
 408                                         /*
 409                                          * FIXME: This will only work on
 410                                          * little-endian systems.
 411                                          */
 412                                         devc->rle_count = sample;
 413                                         sr_dbg("RLE count: %d.", devc->rle_count);
 414                                         devc->num_bytes = 0;
 415                                         return TRUE;
 416                                 }
 417                         }
 418                         devc->num_samples += devc->rle_count + 1;
 419                         if (devc->num_samples > devc->limit_samples) {
 420                                 /* Save us from overrunning the buffer. */
 421                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 422                                 devc->num_samples = devc->limit_samples;
 423                         }
 424
 425                         if (num_channels < 4) {
 426                                 /*
 427                                  * Some channel groups may have been turned
 428                                  * off, to speed up transfer between the
 429                                  * hardware and the PC. Expand that here before
 430                                  * submitting it over the session bus --
 431                                  * whatever is listening on the bus will be
 432                                  * expecting a full 32-bit sample, based on
 433                                  * the number of probes.
 434                                  */
 435                                 j = 0;
 436                                 memset(devc->tmp_sample, 0, 4);
 437                                 for (i = 0; i < 4; i++) {
 438                                         if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 439                                                 /*
 440                                                  * This channel group was
 441                                                  * enabled, copy from received
 442                                                  * sample.
 443                                                  */
 444                                                 devc->tmp_sample[i] = devc->sample[j++];
 445                                         }
 446                                 }
 447                                 memcpy(devc->sample, devc->tmp_sample, 4);
 448                                 sr_dbg("Full sample: 0x%.8x.", sample);
 449                         }
 450
 451                         /* the OLS sends its sample buffer backwards.
 452                          * store it in reverse order here, so we can dump
 453                          * this on the session bus later.
 454                          */
 455                         offset = (devc->limit_samples - devc->num_samples) * 4;
 456                         for (i = 0; i <= devc->rle_count; i++) {
 457                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 458                                        devc->sample, 4);
 459                         }
 460                         memset(devc->sample, 0, 4);
 461                         devc->num_bytes = 0;
 462                         devc->rle_count = 0;
 463                 }
 464         } else {
 465                 /*
 466                  * This is the main loop telling us a timeout was reached, or
 467                  * we've acquired all the samples we asked for -- we're done.
 468                  * Send the (properly-ordered) buffer to the frontend.
 469                  */
 470                 if (devc->trigger_at != -1) {
 471                         /* a trigger was set up, so we need to tell the frontend
 472                          * about it.
 473                          */
 474                         if (devc->trigger_at > 0) {
 475                                 /* there are pre-trigger samples, send those first */
 476                                 packet.type = SR_DF_LOGIC;
 477                                 packet.payload = &logic;
 478                                 logic.length = devc->trigger_at * 4;
 479                                 logic.unitsize = 4;
 480                                 logic.data = devc->raw_sample_buf +
 481                                         (devc->limit_samples - devc->num_samples) * 4;
 482                                 sr_session_send(cb_data, &packet);
 483                         }
 484
 485                         /* send the trigger */
 486                         packet.type = SR_DF_TRIGGER;
 487                         sr_session_send(cb_data, &packet);
 488
 489                         /* send post-trigger samples */
 490                         packet.type = SR_DF_LOGIC;
 491                         packet.payload = &logic;
 492                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 493                         logic.unitsize = 4;
 494                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 495                                 (devc->limit_samples - devc->num_samples) * 4;
 496                         sr_session_send(cb_data, &packet);
 497                 } else {
 498                         /* no trigger was used */
 499                         packet.type = SR_DF_LOGIC;
 500                         packet.payload = &logic;
 501                         logic.length = devc->num_samples * 4;
 502                         logic.unitsize = 4;
 503                         logic.data = devc->raw_sample_buf +
 504                                 (devc->limit_samples - devc->num_samples) * 4;
 505                         sr_session_send(cb_data, &packet);
 506                 }
 507                 g_free(devc->raw_sample_buf);
 508
 509                 serial_flush(devc->serial);
 510                 abort_acquisition(sdi);
 511                 serial_close(devc->serial);
 512         }
 513
 514         return TRUE;
 515 }