src/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, serial_timeout(serial, 1)) != 1)
  34                 return SR_ERR;
  35
  36         if (serial_drain(serial) != 0)
  37                 return SR_ERR;
  38
  39         return SR_OK;
  40 }
  41
  42 SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
  43                 uint8_t command, uint8_t *data)
  44 {
  45         char buf[5];
  46
  47         sr_dbg("Sending cmd 0x%.2x data 0x%.2x%.2x%.2x%.2x.", command,
  48                         data[0], data[1], data[2], data[3]);
  49         buf[0] = command;
  50         buf[1] = data[0];
  51         buf[2] = data[1];
  52         buf[3] = data[2];
  53         buf[4] = data[3];
  54         if (serial_write_blocking(serial, buf, 5, serial_timeout(serial, 1)) != 5)
  55                 return SR_ERR;
  56
  57         if (serial_drain(serial) != 0)
  58                 return SR_ERR;
  59
  60         return SR_OK;
  61 }
  62
  63 /* Configures the channel mask based on which channels are enabled. */
  64 SR_PRIV void ols_channel_mask(const struct sr_dev_inst *sdi)
  65 {
  66         struct dev_context *devc;
  67         struct sr_channel *channel;
  68         const GSList *l;
  69
  70         devc = sdi->priv;
  71
  72         devc->channel_mask = 0;
  73         for (l = sdi->channels; l; l = l->next) {
  74                 channel = l->data;
  75                 if (channel->enabled)
  76                         devc->channel_mask |= 1 << channel->index;
  77         }
  78 }
  79
  80 SR_PRIV int ols_convert_trigger(const struct sr_dev_inst *sdi)
  81 {
  82         struct dev_context *devc;
  83         struct sr_trigger *trigger;
  84         struct sr_trigger_stage *stage;
  85         struct sr_trigger_match *match;
  86         const GSList *l, *m;
  87         int i;
  88
  89         devc = sdi->priv;
  90
  91         devc->num_stages = 0;
  92         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
  93                 devc->trigger_mask[i] = 0;
  94                 devc->trigger_value[i] = 0;
  95         }
  96
  97         if (!(trigger = sr_session_trigger_get(sdi->session)))
  98                 return SR_OK;
  99
 100         devc->num_stages = g_slist_length(trigger->stages);
 101         if (devc->num_stages > NUM_TRIGGER_STAGES) {
 102                 sr_err("This device only supports %d trigger stages.",
 103                                 NUM_TRIGGER_STAGES);
 104                 return SR_ERR;
 105         }
 106
 107         for (l = trigger->stages; l; l = l->next) {
 108                 stage = l->data;
 109                 for (m = stage->matches; m; m = m->next) {
 110                         match = m->data;
 111                         if (!match->channel->enabled)
 112                                 /* Ignore disabled channels with a trigger. */
 113                                 continue;
 114                         devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
 115                         if (match->match == SR_TRIGGER_ONE)
 116                                 devc->trigger_value[stage->stage] |= 1 << match->channel->index;
 117                 }
 118         }
 119
 120         return SR_OK;
 121 }
 122
 123 SR_PRIV struct dev_context *ols_dev_new(void)
 124 {
 125         struct dev_context *devc;
 126
 127         devc = g_malloc0(sizeof(struct dev_context));
 128
 129         /* Device-specific settings */
 130         devc->max_samples = devc->max_samplerate = devc->protocol_version = 0;
 131
 132         /* Acquisition settings */
 133         devc->limit_samples = devc->capture_ratio = 0;
 134         devc->trigger_at = -1;
 135         devc->channel_mask = 0xffffffff;
 136         devc->flag_reg = 0;
 137
 138         return devc;
 139 }
 140
 141 SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
 142 {
 143         struct sr_dev_inst *sdi;
 144         struct dev_context *devc;
 145         struct sr_channel *ch;
 146         uint32_t tmp_int, ui;
 147         uint8_t key, type, token;
 148         int delay_ms;
 149         GString *tmp_str, *devname, *version;
 150         guchar tmp_c;
 151
 152         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 153         sdi->status = SR_ST_INACTIVE;
 154         sdi->driver = di;
 155         devc = ols_dev_new();
 156         sdi->priv = devc;
 157
 158         devname = g_string_new("");
 159         version = g_string_new("");
 160
 161         key = 0xff;
 162         while (key) {
 163                 delay_ms = serial_timeout(serial, 1);
 164                 if (serial_read_blocking(serial, &key, 1, delay_ms) != 1)
 165                         break;
 166                 if (key == 0x00) {
 167                         sr_dbg("Got metadata key 0x00, metadata ends.");
 168                         break;
 169                 }
 170                 type = key >> 5;
 171                 token = key & 0x1f;
 172                 switch (type) {
 173                 case 0:
 174                         /* NULL-terminated string */
 175                         tmp_str = g_string_new("");
 176                         delay_ms = serial_timeout(serial, 1);
 177                         while (serial_read_blocking(serial, &tmp_c, 1, delay_ms) == 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                         delay_ms = serial_timeout(serial, 4);
 210                         if (serial_read_blocking(serial, &tmp_int, 4, delay_ms) != 4)
 211                                 break;
 212                         tmp_int = RB32(&tmp_int);
 213                         sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
 214                                key, tmp_int);
 215                         switch (token) {
 216                         case 0x00:
 217                                 /* Number of usable channels */
 218                                 for (ui = 0; ui < tmp_int; ui++) {
 219                                         if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
 220                                                         ols_channel_names[ui])))
 221                                                 return 0;
 222                                         sdi->channels = g_slist_append(sdi->channels, ch);
 223                                 }
 224                                 break;
 225                         case 0x01:
 226                                 /* Amount of sample memory available (bytes) */
 227                                 devc->max_samples = tmp_int;
 228                                 break;
 229                         case 0x02:
 230                                 /* Amount of dynamic memory available (bytes) */
 231                                 /* what is this for? */
 232                                 break;
 233                         case 0x03:
 234                                 /* Maximum sample rate (hz) */
 235                                 devc->max_samplerate = tmp_int;
 236                                 break;
 237                         case 0x04:
 238                                 /* protocol version */
 239                                 devc->protocol_version = tmp_int;
 240                                 break;
 241                         default:
 242                                 sr_info("Unknown token 0x%.2x: 0x%.8x.",
 243                                         token, tmp_int);
 244                                 break;
 245                         }
 246                         break;
 247                 case 2:
 248                         /* 8-bit unsigned integer */
 249                         delay_ms = serial_timeout(serial, 1);
 250                         if (serial_read_blocking(serial, &tmp_c, 1, delay_ms) != 1)
 251                                 break;
 252                         sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
 253                                key, tmp_c);
 254                         switch (token) {
 255                         case 0x00:
 256                                 /* Number of usable channels */
 257                                 for (ui = 0; ui < tmp_c; ui++) {
 258                                         if (!(ch = sr_channel_new(ui, SR_CHANNEL_LOGIC, TRUE,
 259                                                         ols_channel_names[ui])))
 260                                                 return 0;
 261                                         sdi->channels = g_slist_append(sdi->channels, ch);
 262                                 }
 263                                 break;
 264                         case 0x01:
 265                                 /* protocol version */
 266                                 devc->protocol_version = tmp_c;
 267                                 break;
 268                         default:
 269                                 sr_info("Unknown token 0x%.2x: 0x%.2x.",
 270                                         token, tmp_c);
 271                                 break;
 272                         }
 273                         break;
 274                 default:
 275                         /* unknown type */
 276                         break;
 277                 }
 278         }
 279
 280         sdi->model = devname->str;
 281         sdi->version = version->str;
 282         g_string_free(devname, FALSE);
 283         g_string_free(version, FALSE);
 284
 285         return sdi;
 286 }
 287
 288 SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
 289                 const uint64_t samplerate)
 290 {
 291         struct dev_context *devc;
 292
 293         devc = sdi->priv;
 294         if (devc->max_samplerate && samplerate > devc->max_samplerate)
 295                 return SR_ERR_SAMPLERATE;
 296
 297         if (samplerate > CLOCK_RATE) {
 298                 sr_info("Enabling demux mode.");
 299                 devc->flag_reg |= FLAG_DEMUX;
 300                 devc->flag_reg &= ~FLAG_FILTER;
 301                 devc->max_channels = NUM_CHANNELS / 2;
 302                 devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 303         } else {
 304                 sr_info("Disabling demux mode.");
 305                 devc->flag_reg &= ~FLAG_DEMUX;
 306                 devc->flag_reg |= FLAG_FILTER;
 307                 devc->max_channels = NUM_CHANNELS;
 308                 devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 309         }
 310
 311         /* Calculate actual samplerate used and complain if it is different
 312          * from the requested.
 313          */
 314         devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
 315         if (devc->flag_reg & FLAG_DEMUX)
 316                 devc->cur_samplerate *= 2;
 317         if (devc->cur_samplerate != samplerate)
 318                 sr_info("Can't match samplerate %" PRIu64 ", using %"
 319                        PRIu64 ".", samplerate, devc->cur_samplerate);
 320
 321         return SR_OK;
 322 }
 323
 324 SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
 325 {
 326         struct sr_datafeed_packet packet;
 327         struct sr_serial_dev_inst *serial;
 328
 329         serial = sdi->conn;
 330         serial_source_remove(sdi->session, serial);
 331
 332         /* Terminate session */
 333         packet.type = SR_DF_END;
 334         sr_session_send(sdi, &packet);
 335 }
 336
 337 SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
 338 {
 339         struct dev_context *devc;
 340         struct sr_dev_inst *sdi;
 341         struct sr_serial_dev_inst *serial;
 342         struct sr_datafeed_packet packet;
 343         struct sr_datafeed_logic logic;
 344         uint32_t sample;
 345         int num_ols_changrp, offset, j;
 346         unsigned int i;
 347         unsigned char byte;
 348
 349         (void)fd;
 350
 351         sdi = cb_data;
 352         serial = sdi->conn;
 353         devc = sdi->priv;
 354
 355         if (devc->num_transfers++ == 0) {
 356                 /*
 357                  * First time round, means the device started sending data,
 358                  * and will not stop until done. If it stops sending for
 359                  * longer than it takes to send a byte, that means it's
 360                  * finished. We'll double that to 30ms to be sure...
 361                  */
 362                 serial_source_remove(sdi->session, serial);
 363                 serial_source_add(sdi->session, serial, G_IO_IN, 30,
 364                                 ols_receive_data, cb_data);
 365                 devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
 366                 if (!devc->raw_sample_buf) {
 367                         sr_err("Sample buffer malloc failed.");
 368                         return FALSE;
 369                 }
 370                 /* fill with 1010... for debugging */
 371                 memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
 372         }
 373
 374         num_ols_changrp = 0;
 375         for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
 376                 if ((devc->flag_reg & i) == 0) {
 377                         num_ols_changrp++;
 378                 }
 379         }
 380
 381         if (revents == G_IO_IN && devc->num_samples < devc->limit_samples) {
 382                 if (serial_read_nonblocking(serial, &byte, 1) != 1)
 383                         return FALSE;
 384                 devc->cnt_bytes++;
 385
 386                 /* Ignore it if we've read enough. */
 387                 if (devc->num_samples >= devc->limit_samples)
 388                         return TRUE;
 389
 390                 devc->sample[devc->num_bytes++] = byte;
 391                 sr_spew("Received byte 0x%.2x.", byte);
 392                 if (devc->num_bytes == num_ols_changrp) {
 393                         devc->cnt_samples++;
 394                         devc->cnt_samples_rle++;
 395                         /*
 396                          * Got a full sample. Convert from the OLS's little-endian
 397                          * sample to the local format.
 398                          */
 399                         sample = devc->sample[0] | (devc->sample[1] << 8) \
 400                                         | (devc->sample[2] << 16) | (devc->sample[3] << 24);
 401                         sr_dbg("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
 402                         if (devc->flag_reg & FLAG_RLE) {
 403                                 /*
 404                                  * In RLE mode the high bit of the sample is the
 405                                  * "count" flag, meaning this sample is the number
 406                                  * of times the previous sample occurred.
 407                                  */
 408                                 if (devc->sample[devc->num_bytes - 1] & 0x80) {
 409                                         /* Clear the high bit. */
 410                                         sample &= ~(0x80 << (devc->num_bytes - 1) * 8);
 411                                         devc->rle_count = sample;
 412                                         devc->cnt_samples_rle += devc->rle_count;
 413                                         sr_dbg("RLE count: %u.", 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_ols_changrp < 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 channels.
 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                                         } else if (devc->flag_reg & FLAG_DEMUX && (i > 2)) {
 446                                                 /* group 2 & 3 get added to 0 & 1 */
 447                                                 devc->tmp_sample[i - 2] = devc->sample[j++];
 448                                         }
 449                                 }
 450                                 memcpy(devc->sample, devc->tmp_sample, 4);
 451                                 sr_spew("Expanded sample: 0x%.8x.", sample);
 452                         }
 453
 454                         /*
 455                          * the OLS sends its sample buffer backwards.
 456                          * store it in reverse order here, so we can dump
 457                          * this on the session bus later.
 458                          */
 459                         offset = (devc->limit_samples - devc->num_samples) * 4;
 460                         for (i = 0; i <= devc->rle_count; i++) {
 461                                 memcpy(devc->raw_sample_buf + offset + (i * 4),
 462                                        devc->sample, 4);
 463                         }
 464                         memset(devc->sample, 0, 4);
 465                         devc->num_bytes = 0;
 466                         devc->rle_count = 0;
 467                 }
 468         } else {
 469                 /*
 470                  * This is the main loop telling us a timeout was reached, or
 471                  * we've acquired all the samples we asked for -- we're done.
 472                  * Send the (properly-ordered) buffer to the frontend.
 473                  */
 474                 sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
 475                                 devc->cnt_bytes, devc->cnt_samples,
 476                                 devc->cnt_samples_rle);
 477                 if (devc->trigger_at != -1) {
 478                         /*
 479                          * A trigger was set up, so we need to tell the frontend
 480                          * about it.
 481                          */
 482                         if (devc->trigger_at > 0) {
 483                                 /* There are pre-trigger samples, send those first. */
 484                                 packet.type = SR_DF_LOGIC;
 485                                 packet.payload = &logic;
 486                                 logic.length = devc->trigger_at * 4;
 487                                 logic.unitsize = 4;
 488                                 logic.data = devc->raw_sample_buf +
 489                                         (devc->limit_samples - devc->num_samples) * 4;
 490                                 sr_session_send(cb_data, &packet);
 491                         }
 492
 493                         /* Send the trigger. */
 494                         packet.type = SR_DF_TRIGGER;
 495                         sr_session_send(cb_data, &packet);
 496
 497                         /* Send post-trigger samples. */
 498                         packet.type = SR_DF_LOGIC;
 499                         packet.payload = &logic;
 500                         logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
 501                         logic.unitsize = 4;
 502                         logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
 503                                 (devc->limit_samples - devc->num_samples) * 4;
 504                         sr_session_send(cb_data, &packet);
 505                 } else {
 506                         /* no trigger was used */
 507                         packet.type = SR_DF_LOGIC;
 508                         packet.payload = &logic;
 509                         logic.length = devc->num_samples * 4;
 510                         logic.unitsize = 4;
 511                         logic.data = devc->raw_sample_buf +
 512                                 (devc->limit_samples - devc->num_samples) * 4;
 513                         sr_session_send(cb_data, &packet);
 514                 }
 515                 g_free(devc->raw_sample_buf);
 516
 517                 serial_flush(serial);
 518                 abort_acquisition(sdi);
 519         }
 520
 521         return TRUE;
 522 }