hardware/openbench-logic-sniffer/protocol.c

   1 /*
   2  * This file is part of the libsigrok 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 #include <libserialport.h>
  22
  23 extern SR_PRIV struct sr_dev_driver ols_driver_info;
  24 static struct sr_dev_driver *di = &ols_driver_info;
  25
  26 SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
  27                 uint8_t command)
  28 {
  29         char buf[1];
  30
  31         sr_dbg("Sending cmd 0x%.2x.", command);
  32         buf[0] = command;
  33         if (serial_write_blocking(serial, buf, 1) != 1)
  34                 return SR_ERR;
  35
  36         return SR_OK;
  37 }
  38
  39 SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
  40                 uint8_t command, uint8_t *data)
  41 {
  42         char buf[5];
  43
  44         sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
  45                         data[0], data[1], data[2], data[3]);
  46         buf[0] = command;
  47         buf[1] = data[0];
  48         buf[2] = data[1];
  49         buf[3] = data[2];
  50         buf[4] = data[3];
  51         if (serial_write_blocking(serial, buf, 5) != 5)
  52                 return SR_ERR;
  53
  54         return SR_OK;
  55 }
  56
  57 /* Configures the channel mask based on which channels are enabled. */
  58 SR_PRIV void ols_channel_mask(const struct sr_dev_inst *sdi)
  59 {
  60         struct dev_context *devc;
  61         struct sr_channel *channel;
  62         const GSList *l;
  63
  64         devc = sdi->priv;
  65
  66         devc->channel_mask = 0;
  67         for (l = sdi->channels; l; l = l->next) {
  68                 channel = l->data;
  69                 if (channel->enabled)
  70                         devc->channel_mask |= 1 << channel->index;
  71         }
  72 }
  73
  74 SR_PRIV int ols_convert_trigger(const struct sr_dev_inst *sdi)
  75 {
  76         struct dev_context *devc;
  77         struct sr_trigger *trigger;
  78         struct sr_trigger_stage *stage;
  79         struct sr_trigger_match *match;
  80         const GSList *l, *m;
  81         int i;
  82
  83         devc = sdi->priv;
  84
  85         devc->num_stages = 0;
  86         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
  87                 devc->trigger_mask[i] = 0;
  88                 devc->trigger_value[i] = 0;
  89         }
  90
  91         if (!(trigger = sr_session_trigger_get(sdi->session)))
  92                 return SR_OK;
  93
  94         devc->num_stages = g_slist_length(trigger->stages);
  95         if (devc->num_stages > NUM_TRIGGER_STAGES) {
  96                 sr_err("This device only supports %d trigger stages.",
  97                                 NUM_TRIGGER_STAGES);
  98                 return SR_ERR;
  99         }
 100
 101         for (l = trigger->stages; l; l = l->next) {
 102                 stage = l->data;
 103                 for (m = stage->matches; m; m = m->next) {
 104                         match = m->data;
 105                         if (!match->channel->enabled)
 106                                 /* Ignore disabled channels with a trigger. */
 107                                 continue;
 108                         devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
 109                         if (match->match == SR_TRIGGER_ONE)
 110                                 devc->trigger_value[stage->stage] |= 1 << match->channel->index;
 111                 }
 112         }
 113
 114         return SR_OK;
 115 }
 116
 117 SR_PRIV struct dev_context *ols_dev_new(void)
 118 {
 119         struct dev_context *devc;
 120
 121         if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
 122                 sr_err("Device context malloc failed.");
 123                 return NULL;
 124         }
 125
 126         /* Device-specific settings */
 127         devc->max_samples = devc->max_samplerate = devc->protocol_version = 0;
 128
 129         /* Acquisition settings */
 130         devc->limit_samples = devc->capture_ratio = 0;
 131         devc->trigger_at = -1;
 132         devc->channel_mask = 0xffffffff;
 133         devc->flag_reg = 0;
 134
 135         return devc;
 136 }
 137
 138 SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
 139 {
 140         struct sr_dev_inst *sdi;
 141         struct dev_context *devc;
 142         struct sr_channel *ch;
 143         uint32_t tmp_int, ui;
 144         uint8_t key, type, token;
 145         GString *tmp_str, *devname, *version;
 146         guchar tmp_c;
 147
 148         sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, NULL, NULL, NULL);
 149         sdi->driver = di;
 150         devc = ols_dev_new();
 151         sdi->priv = devc;
 152
 153         devname = g_string_new("");
 154         version = g_string_new("");
 155
 156         key = 0xff;
 157         while (key) {
 158                 if (serial_read_blocking(serial, &key, 1) != 1)
 159                         break;
 160                 if (key == 0x00) {
 161                         sr_dbg("Got metadata key 0x00, metadata ends.");
 162                         break;
 163                 }
 164                 type = key >> 5;
 165                 token = key & 0x1f;
 166                 switch (type) {
 167                 case 0:
 168                         /* NULL-terminated string */
 169                         tmp_str = g_string_new("");
 170                         while (serial_read_blocking(serial, &tmp_c, 1) == 1 && tmp_c != '\0')
 171                                 g_string_append_c(tmp_str, tmp_c);
 172                         sr_dbg("Got metadata key 0x%.2x value '%s'.",
 173                                key, tmp_str->str);
 174                         switch (token) {
 175                         case 0x01:
 176                                 /* Device name */
 177                                 devname = g_string_append(devname, tmp_str->str);
 178                                 break;
 179                         case 0x02:
 180                                 /* FPGA firmware version */
 181                                 if (version->len)
 182                                         g_string_append(version, ", ");
 183                                 g_string_append(version, "FPGA version ");
 184                                 g_string_append(version, tmp_str->str);
 185                                 break;
 186                         case 0x03:
 187                                 /* Ancillary version */
 188                                 if (version->len)
 189                                         g_string_append(version, ", ");
 190                                 g_string_append(version, "Ancillary version ");
 191                                 g_string_append(version, tmp_str->str);
 192                                 break;
 193                         default:
 194                                 sr_info("ols: unknown token 0x%.2x: '%s'",
 195                                         token, tmp_str->str);
 196                                 break;
 197                         }
 198                         g_string_free(tmp_str, TRUE);
 199                         break;
 200                 case 1:
 201                         /* 32-bit unsigned integer */
 202                         if (serial_read_blocking(serial, &tmp_int, 4) != 4)
 203                                 break;
 204                         tmp_int = RB32(&tmp_int);
 205                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 206                                key, tmp_int);
 207                         switch (token) {
 208                         case 0x00:
 209                                 /* Number of usable channels */
 210                                 for (ui = 0; ui < tmp_int; ui++) {
 211                                         if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
 212                                                         ols_channel_names[ui])))
 213                                                 return 0;
 214                                         sdi->channels = g_slist_append(sdi->channels, ch);
 215                                 }
 216                                 break;
 217                         case 0x01:
 218                                 /* Amount of sample memory available (bytes) */
 219                                 devc->max_samples = tmp_int;
 220                                 break;
 221                         case 0x02:
 222                                 /* Amount of dynamic memory available (bytes) */
 223                                 /* what is this for? */
 224                                 break;
 225                         case 0x03:
 226                                 /* Maximum sample rate (hz) */
 227                                 devc->max_samplerate = tmp_int;
 228                                 break;
 229                         case 0x04:
 230                                 /* protocol version */
 231                                 devc->protocol_version = tmp_int;
 232                                 break;
 233                         default:
 234                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 235                                         token, tmp_int);
 236                                 break;
 237                         }
 238                         break;
 239                 case 2:
 240                         /* 8-bit unsigned integer */
 241                         if (serial_read_blocking(serial, &tmp_c, 1) != 1)
 242                                 break;
 243                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 244                                key, tmp_c);
 245                         switch (token) {
 246                         case 0x00:
 247                                 /* Number of usable channels */
 248                                 for (ui = 0; ui < tmp_c; ui++) {
 249                                         if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
 250                                                         ols_channel_names[ui])))
 251                                                 return 0;
 252                                         sdi->channels = g_slist_append(sdi->channels, ch);
 253                                 }
 254                                 break;
 255                         case 0x01:
 256                                 /* protocol version */
 257                                 devc->protocol_version = tmp_c;
 258                                 break;
 259                         default:
 260                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 261                                         token, tmp_c);
 262                                 break;
 263                         }
 264                         break;
 265                 default:
 266                         /* unknown type */
 267                         break;
 268                 }
 269         }
 270
 271         sdi->model = devname->str;
 272         sdi->version = version->str;
 273         g_string_free(devname, FALSE);
 274         g_string_free(version, FALSE);
 275
 276         return sdi;
 277 }
 278
 279 SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
 280                 const uint64_t samplerate)
 281 {
 282         struct dev_context *devc;
 283
 284         devc = sdi->priv;
 285         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 286                 return SR_ERR_SAMPLERATE;
 287
 288         if (samplerate > CLOCK_RATE) {
 289                 sr_info("Enabling demux mode.");
 290                 devc->flag_reg |= FLAG_DEMUX;
 291                 devc->flag_reg &= ~FLAG_FILTER;
 292                 devc->max_channels = NUM_CHANNELS / 2;
 293                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 294         } else {
 295                 sr_info("Disabling demux mode.");
 296                 devc->flag_reg &= ~FLAG_DEMUX;
 297                 devc->flag_reg |= FLAG_FILTER;
 298                 devc->max_channels = NUM_CHANNELS;
 299                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 300         }
 301
 302         /* Calculate actual samplerate used and complain if it is different
 303          * from the requested.
 304          */
 305         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 306         if (devc->flag_reg & FLAG_DEMUX)
 307                 devc->cur_samplerate *= 2;
 308         if (devc->cur_samplerate != samplerate)
 309                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 310                        PRIu64 ".", samplerate, devc->cur_samplerate);
 311
 312         return SR_OK;
 313 }
 314
 315 SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
 316 {
 317         struct sr_datafeed_packet packet;
 318         struct sr_serial_dev_inst *serial;
 319
 320         serial = sdi->conn;
 321         serial_source_remove(serial);
 322
 323         /* Terminate session */
 324         packet.type = SR_DF_END;
 325         sr_session_send(sdi, &packet);
 326 }
 327
 328 SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
 329 {
 330         struct dev_context *devc;
 331         struct sr_dev_inst *sdi;
 332         struct sr_serial_dev_inst *serial;
 333         struct sr_datafeed_packet packet;
 334         struct sr_datafeed_logic logic;
 335         uint32_t sample;
 336         int num_ols_changrp, offset, j;
 337         unsigned int i;
 338         unsigned char byte;
 339
 340         (void)fd;
 341
 342         sdi = cb_data;
 343         serial = sdi->conn;
 344         devc = sdi->priv;
 345
 346         if (devc->num_transfers++ == 0) {
 347                 /*
 348                  * First time round, means the device started sending data,
 349                  * and will not stop until done. If it stops sending for
 350                  * longer than it takes to send a byte, that means it's
 351                  * finished. We'll double that to 30ms to be sure...
 352                  */
 353                 serial_source_remove(serial);
 354                 serial_source_add(serial, G_IO_IN, 30, ols_receive_data, cb_data);
 355                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 356                 if (!devc->raw_sample_buf) {
 357                         sr_err("Sample buffer malloc failed.");
 358                         return FALSE;
 359                 }
 360                 /* fill with 1010... for debugging */
 361                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 362         }
 363
 364         num_ols_changrp = 0;
 365         for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
 366                 if ((devc->flag_reg & i) == 0) {
 367                         num_ols_changrp++;
 368                 }
 369         }
 370
 371         if (revents == G_IO_IN && devc->num_samples < devc->limit_samples) {
 372                 if (serial_read_nonblocking(serial, &byte, 1) != 1)
 373                         return FALSE;
 374                 devc->cnt_bytes++;
 375
 376                 /* Ignore it if we've read enough. */
 377                 if (devc->num_samples >= devc->limit_samples)
 378                         return TRUE;
 379
 380                 devc->sample[devc->num_bytes++] = byte;
 381                 sr_spew("Received byte 0x%.2x.", byte);
 382                 if (devc->num_bytes == num_ols_changrp) {
 383                         devc->cnt_samples++;
 384                         devc->cnt_samples_rle++;
 385                         /*
 386                          * Got a full sample. Convert from the OLS's little-endian
 387                          * sample to the local format.
 388                          */
 389                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 390                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 391                         sr_dbg("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 392                         if (devc->flag_reg & FLAG_RLE) {
 393                                 /*
 394                                  * In RLE mode the high bit of the sample is the
 395                                  * "count" flag, meaning this sample is the number
 396                                  * of times the previous sample occurred.
 397                                  */
 398                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 399                                         /* Clear the high bit. */
 400                                         sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 401                                         devc->rle_count = sample;
 402                                         devc->cnt_samples_rle += devc->rle_count;
 403                                         sr_dbg("RLE count: %u.", devc->rle_count);
 404                                         devc->num_bytes = 0;
 405                                         return TRUE;
 406                                 }
 407                         }
 408                         devc->num_samples += devc->rle_count + 1;
 409                         if (devc->num_samples > devc->limit_samples) {
 410                                 /* Save us from overrunning the buffer. */
 411                                 devc->rle_count -= devc->num_samples - devc->limit_samples;
 412                                 devc->num_samples = devc->limit_samples;
 413                         }
 414
 415                         if (num_ols_changrp < 4) {
 416                                 /*
 417                                  * Some channel groups may have been turned
 418                                  * off, to speed up transfer between the
 419                                  * hardware and the PC. Expand that here before
 420                                  * submitting it over the session bus --
 421                                  * whatever is listening on the bus will be
 422                                  * expecting a full 32-bit sample, based on
 423                                  * the number of channels.
 424                                  */
 425                                 j = 0;
 426                                 memset(devc->tmp_sample, 0, 4);
 427                                 for (i = 0; i < 4; i++) {
 428                                         if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
 429                                                 /*
 430                                                  * This channel group was
 431                                                  * enabled, copy from received
 432                                                  * sample.
 433                                                  */
 434                                                 devc->tmp_sample[i] = devc->sample[j++];
 435                                         } else if (devc->flag_reg & FLAG_DEMUX && (i > 2)) {
 436                                                 /* group 2 & 3 get added to 0 & 1 */
 437                                                 devc->tmp_sample[i - 2] = devc->sample[j++];
 438                                         }
 439                                 }
 440                                 memcpy(devc->sample, devc->tmp_sample, 4);
 441                                 sr_spew("Expanded sample: 0x%.8x.", sample);
 442                         }
 443
 444                         /*
 445                          * the OLS sends its sample buffer backwards.
 446                          * store it in reverse order here, so we can dump
 447                          * this on the session bus later.
 448                          */
 449                         offset = (devc->limit_samples - devc->num_samples) * 4;
 450                         for (i = 0; i <= devc->rle_count; i++) {
 451                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 452                                        devc->sample, 4);
 453                         }
 454                         memset(devc->sample, 0, 4);
 455                         devc->num_bytes = 0;
 456                         devc->rle_count = 0;
 457                 }
 458         } else {
 459                 /*
 460                  * This is the main loop telling us a timeout was reached, or
 461                  * we've acquired all the samples we asked for -- we're done.
 462                  * Send the (properly-ordered) buffer to the frontend.
 463                  */
 464                 sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
 465                                 devc->cnt_bytes, devc->cnt_samples,
 466                                 devc->cnt_samples_rle);
 467                 if (devc->trigger_at != -1) {
 468                         /*
 469                          * A trigger was set up, so we need to tell the frontend
 470                          * about it.
 471                          */
 472                         if (devc->trigger_at > 0) {
 473                                 /* There are pre-trigger samples, send those first. */
 474                                 packet.type = SR_DF_LOGIC;
 475                                 packet.payload = &logic;
 476                                 logic.length = devc->trigger_at * 4;
 477                                 logic.unitsize = 4;
 478                                 logic.data = devc->raw_sample_buf +
 479                                         (devc->limit_samples - devc->num_samples) * 4;
 480                                 sr_session_send(cb_data, &packet);
 481                         }
 482
 483                         /* Send the trigger. */
 484                         packet.type = SR_DF_TRIGGER;
 485                         sr_session_send(cb_data, &packet);
 486
 487                         /* Send post-trigger samples. */
 488                         packet.type = SR_DF_LOGIC;
 489                         packet.payload = &logic;
 490                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 491                         logic.unitsize = 4;
 492                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 493                                 (devc->limit_samples - devc->num_samples) * 4;
 494                         sr_session_send(cb_data, &packet);
 495                 } else {
 496                         /* no trigger was used */
 497                         packet.type = SR_DF_LOGIC;
 498                         packet.payload = &logic;
 499                         logic.length = devc->num_samples * 4;
 500                         logic.unitsize = 4;
 501                         logic.data = devc->raw_sample_buf +
 502                                 (devc->limit_samples - devc->num_samples) * 4;
 503                         sr_session_send(cb_data, &packet);
 504                 }
 505                 g_free(devc->raw_sample_buf);
 506
 507                 serial_flush(serial);
 508                 abort_acquisition(sdi);
 509         }
 510
 511         return TRUE;
 512 }