src/hardware/ipdbg-la/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2016 Eva Kissling <eva.kissling@bluewin.ch>
   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 <config.h>
  21
  22 #ifdef _WIN32
  23 #define _WIN32_WINNT 0x0501
  24 #include <winsock2.h>
  25 #include <ws2tcpip.h>
  26 #else
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <netdb.h>
  31 #include <sys/ioctl.h>
  32 #endif
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <errno.h>
  36 #include "protocol.h"
  37
  38 #define BUFFER_SIZE 4
  39
  40 /* Top-level command opcodes */
  41 #define CMD_SET_TRIGGER            0x00
  42 #define CMD_CFG_TRIGGER            0xF0
  43 #define CMD_CFG_LA                 0x0F
  44 #define CMD_START                  0xFE
  45 #define CMD_RESET                  0xEE
  46
  47 #define CMD_GET_BUS_WIDTHS         0xAA
  48 #define CMD_GET_LA_ID              0xBB
  49 #define CMD_ESCAPE                 0x55
  50
  51 /* Trigger subfunction command opcodes */
  52 #define CMD_TRIG_MASKS             0xF1
  53 #define CMD_TRIG_MASK              0xF3
  54 #define CMD_TRIG_VALUE             0xF7
  55
  56 #define CMD_TRIG_MASKS_LAST        0xF9
  57 #define CMD_TRIG_MASK_LAST         0xFB
  58 #define CMD_TRIG_VALUE_LAST        0xFF
  59
  60 #define CMD_TRIG_SELECT_EDGE_MASK  0xF5
  61 #define CMD_TRIG_SET_EDGE_MASK     0xF6
  62
  63 /* LA subfunction command opcodes */
  64 #define CMD_LA_DELAY               0x1F
  65
  66 static gboolean data_available(struct ipdbg_la_tcp *tcp)
  67 {
  68 #ifdef _WIN32
  69         u_long bytes_available;
  70         if (ioctlsocket(tcp->socket, FIONREAD, &bytes_available) != 0) {
  71 #else
  72         int bytes_available;
  73         if (ioctl(tcp->socket, FIONREAD, &bytes_available) < 0) { /* TIOCMGET */
  74 #endif
  75                 sr_err("FIONREAD failed: %s\n", g_strerror(errno));
  76                 return FALSE;
  77         }
  78         return (bytes_available > 0);
  79 }
  80
  81 SR_PRIV struct ipdbg_la_tcp *ipdbg_la_tcp_new(void)
  82 {
  83         struct ipdbg_la_tcp *tcp;
  84
  85         tcp = g_malloc0(sizeof(struct ipdbg_la_tcp));
  86         tcp->address = NULL;
  87         tcp->port = NULL;
  88         tcp->socket = -1;
  89
  90         return tcp;
  91 }
  92
  93 SR_PRIV void ipdbg_la_tcp_free(struct ipdbg_la_tcp *tcp)
  94 {
  95         g_free(tcp->address);
  96         g_free(tcp->port);
  97 }
  98
  99 SR_PRIV int ipdbg_la_tcp_open(struct ipdbg_la_tcp *tcp)
 100 {
 101         struct addrinfo hints;
 102         struct addrinfo *results, *res;
 103         int err;
 104
 105         memset(&hints, 0, sizeof(hints));
 106         hints.ai_family = AF_UNSPEC;
 107         hints.ai_socktype = SOCK_STREAM;
 108         hints.ai_protocol = IPPROTO_TCP;
 109
 110         err = getaddrinfo(tcp->address, tcp->port, &hints, &results);
 111
 112         if (err) {
 113                 sr_err("Address lookup failed: %s:%s: %s", tcp->address,
 114                         tcp->port, gai_strerror(err));
 115                 return SR_ERR;
 116         }
 117
 118         for (res = results; res; res = res->ai_next) {
 119                 if ((tcp->socket = socket(res->ai_family, res->ai_socktype,
 120                         res->ai_protocol)) < 0)
 121                         continue;
 122                 if (connect(tcp->socket, res->ai_addr, res->ai_addrlen) != 0) {
 123                         close(tcp->socket);
 124                         tcp->socket = -1;
 125                         continue;
 126                 }
 127                 break;
 128         }
 129
 130         freeaddrinfo(results);
 131
 132         if (tcp->socket < 0) {
 133                 sr_err("Failed to connect to %s:%s: %s", tcp->address, tcp->port,
 134                         g_strerror(errno));
 135                 return SR_ERR;
 136         }
 137
 138         return SR_OK;
 139 }
 140
 141 SR_PRIV int ipdbg_la_tcp_close(struct ipdbg_la_tcp *tcp)
 142 {
 143         int ret = SR_OK;
 144
 145 #ifdef _WIN32
 146         if (shutdown(tcp->socket, SD_SEND) != SOCKET_ERROR) {
 147                 char recvbuf[16];
 148                 int recvbuflen = 16;
 149                 /* Receive until the peer closes the connection. */
 150                 while (recv(tcp->socket, recvbuf, recvbuflen, 0) > 0);
 151         }
 152 #endif
 153         if (close(tcp->socket) < 0)
 154                 ret = SR_ERR;
 155
 156         tcp->socket = -1;
 157
 158         return ret;
 159 }
 160
 161 static int tcp_send(struct ipdbg_la_tcp *tcp, const uint8_t *buf, size_t len)
 162 {
 163         int out;
 164         out = send(tcp->socket, (const char *)buf, len, 0);
 165
 166         if (out < 0) {
 167                 sr_err("Send error: %s", g_strerror(errno));
 168                 return SR_ERR;
 169         }
 170
 171         if (out < (int)len)
 172                 sr_dbg("Only sent %d/%d bytes of data.", out, (int)len);
 173
 174         return SR_OK;
 175 }
 176
 177 static int tcp_receive_blocking(struct ipdbg_la_tcp *tcp,
 178         uint8_t *buf, int bufsize)
 179 {
 180         int received = 0;
 181         int error_count = 0;
 182
 183         /* Timeout after 2s of not receiving data. */
 184         /* Increase timeout in case lab is not just beside the office. */
 185         while ((received < bufsize) && (error_count < 2000)) {
 186                 int recd = ipdbg_la_tcp_receive(tcp, buf, bufsize - received);
 187                 if (recd > 0) {
 188                         buf += recd;
 189                         received += recd;
 190                 } else {
 191                         error_count++;
 192                         g_usleep(1000);
 193                 }
 194         }
 195
 196         return received;
 197 }
 198
 199 SR_PRIV int ipdbg_la_tcp_receive(struct ipdbg_la_tcp *tcp,
 200         uint8_t *buf, size_t bufsize)
 201 {
 202         int received = 0;
 203         if (data_available(tcp))
 204                 received = recv(tcp->socket, (char *)buf, bufsize, 0);
 205         if (received < 0) {
 206                 sr_err("Receive error: %s", g_strerror(errno));
 207                 return -1;
 208         } else
 209                 return received;
 210 }
 211
 212 SR_PRIV int ipdbg_la_convert_trigger(const struct sr_dev_inst *sdi)
 213 {
 214         struct dev_context *devc;
 215         struct sr_trigger *trigger;
 216         struct sr_trigger_stage *stage;
 217         struct sr_trigger_match *match;
 218         const GSList *l, *m;
 219
 220         devc = sdi->priv;
 221
 222         devc->num_stages = 0;
 223         devc->num_transfers = 0;
 224         devc->raw_sample_buf = NULL;
 225
 226         for (uint64_t i = 0; i < devc->data_width_bytes; i++) {
 227                 devc->trigger_mask[i] = 0;
 228                 devc->trigger_value[i] = 0;
 229                 devc->trigger_mask_last[i] = 0;
 230                 devc->trigger_value_last[i] = 0;
 231                 devc->trigger_edge_mask[i] = 0;
 232         }
 233
 234         if (!(trigger = sr_session_trigger_get(sdi->session)))
 235                 return SR_OK;
 236
 237         for (l = trigger->stages; l; l = l->next) {
 238                 stage = l->data;
 239                 for (m = stage->matches; m; m = m->next) {
 240                         match = m->data;
 241                         int byte_idx = match->channel->index / 8;
 242                         uint8_t match_bit = 1 << (match->channel->index % 8);
 243
 244                         if (!match->channel->enabled)
 245                                 /* Ignore disabled channels with a trigger. */
 246                                 continue;
 247
 248                         if (match->match == SR_TRIGGER_ONE) {
 249                                 devc->trigger_value[byte_idx] |= match_bit;
 250                                 devc->trigger_mask[byte_idx] |= match_bit;
 251                                 devc->trigger_mask_last[byte_idx] &= ~match_bit;
 252                                 devc->trigger_edge_mask[byte_idx] &= ~match_bit;
 253                         } else if (match->match == SR_TRIGGER_ZERO) {
 254                                 devc->trigger_value[byte_idx] &= ~match_bit;
 255                                 devc->trigger_mask[byte_idx] |= match_bit;
 256                                 devc->trigger_mask_last[byte_idx] &= ~match_bit;
 257                                 devc->trigger_edge_mask[byte_idx] &= ~match_bit;
 258                         } else if (match->match == SR_TRIGGER_RISING) {
 259                                 devc->trigger_value[byte_idx] |= match_bit;
 260                                 devc->trigger_value_last[byte_idx] &=
 261                                     ~match_bit;
 262                                 devc->trigger_mask[byte_idx] |= match_bit;
 263                                 devc->trigger_mask_last[byte_idx] |= match_bit;
 264                                 devc->trigger_edge_mask[byte_idx] &= ~match_bit;
 265                         } else if (match->match == SR_TRIGGER_FALLING) {
 266                                 devc->trigger_value[byte_idx] &= ~match_bit;
 267                                 devc->trigger_value_last[byte_idx] |= match_bit;
 268                                 devc->trigger_mask[byte_idx] |= match_bit;
 269                                 devc->trigger_mask_last[byte_idx] |= match_bit;
 270                                 devc->trigger_edge_mask[byte_idx] &= ~match_bit;
 271                         } else if (match->match == SR_TRIGGER_EDGE) {
 272                                 devc->trigger_mask[byte_idx] &= ~match_bit;
 273                                 devc->trigger_mask_last[byte_idx] &= ~match_bit;
 274                                 devc->trigger_edge_mask[byte_idx] |= match_bit;
 275                         }
 276                 }
 277         }
 278
 279         return SR_OK;
 280 }
 281
 282 SR_PRIV int ipdbg_la_receive_data(int fd, int revents, void *cb_data)
 283 {
 284         const struct sr_dev_inst *sdi;
 285         struct dev_context *devc;
 286
 287         (void)fd;
 288         (void)revents;
 289
 290         sdi = cb_data;
 291         if (!sdi)
 292                 return FALSE;
 293
 294         if (!(devc = sdi->priv))
 295                 return FALSE;
 296
 297         struct ipdbg_la_tcp *tcp = sdi->conn;
 298         struct sr_datafeed_packet packet;
 299         struct sr_datafeed_logic logic;
 300
 301         if (!devc->raw_sample_buf) {
 302                 devc->raw_sample_buf =
 303                         g_try_malloc(devc->limit_samples * devc->data_width_bytes);
 304                 if (!devc->raw_sample_buf) {
 305                         sr_err("Sample buffer malloc failed.");
 306                         return FALSE;
 307                 }
 308         }
 309
 310         if (devc->num_transfers <
 311                 (devc->limit_samples_max * devc->data_width_bytes)) {
 312                 const size_t bufsize = 1024;
 313                 uint8_t buffer[bufsize];
 314
 315                 const int recd = ipdbg_la_tcp_receive(tcp, buffer, bufsize);
 316                 if ( recd > 0) {
 317                         int num_move = (((devc->num_transfers + recd) <=
 318                                                          (devc->limit_samples * devc->data_width_bytes))
 319                         ?
 320                                 recd
 321                         :
 322                                 (int)((devc->limit_samples * devc->data_width_bytes) -
 323                                                 devc->num_transfers));
 324                         if ( num_move > 0 )
 325                                 memcpy(&(devc->raw_sample_buf[devc->num_transfers]),
 326                                                 buffer, num_move);
 327                         devc->num_transfers += recd;
 328                 }
 329         } else {
 330                 if (devc->delay_value > 0) {
 331                         /* There are pre-trigger samples, send those first. */
 332                         packet.type = SR_DF_LOGIC;
 333                         packet.payload = &logic;
 334                         logic.length = devc->delay_value * devc->data_width_bytes;
 335                         logic.unitsize = devc->data_width_bytes;
 336                         logic.data = devc->raw_sample_buf;
 337                         sr_session_send(cb_data, &packet);
 338                 }
 339
 340                 /* Send the trigger. */
 341                 std_session_send_df_trigger(cb_data);
 342
 343                 /* Send post-trigger samples. */
 344                 packet.type = SR_DF_LOGIC;
 345                 packet.payload = &logic;
 346                 logic.length = (devc->limit_samples - devc->delay_value) *
 347                         devc->data_width_bytes;
 348                 logic.unitsize = devc->data_width_bytes;
 349                 logic.data = devc->raw_sample_buf +
 350                         (devc->delay_value * devc->data_width_bytes);
 351                 sr_session_send(cb_data, &packet);
 352
 353                 g_free(devc->raw_sample_buf);
 354                 devc->raw_sample_buf = NULL;
 355
 356                 ipdbg_la_abort_acquisition(sdi);
 357         }
 358
 359         return TRUE;
 360 }
 361
 362 static int send_escaping(struct ipdbg_la_tcp *tcp, uint8_t *data_to_send,
 363         uint32_t length)
 364 {
 365         uint8_t escape = CMD_ESCAPE;
 366
 367         while (length--) {
 368                 uint8_t payload = *data_to_send++;
 369
 370                 if (payload == CMD_RESET)
 371                         if (tcp_send(tcp, &escape, 1) != SR_OK)
 372                                 sr_warn("Couldn't send escape");
 373
 374                 if (payload == CMD_ESCAPE)
 375                         if (tcp_send(tcp, &escape, 1) != SR_OK)
 376                                 sr_warn("Couldn't send escape");
 377
 378                 if (tcp_send(tcp, &payload, 1) != SR_OK)
 379                         sr_warn("Couldn't send data");
 380         }
 381
 382         return SR_OK;
 383 }
 384
 385 SR_PRIV int ipdbg_la_send_delay(struct dev_context *devc,
 386         struct ipdbg_la_tcp *tcp)
 387 {
 388         devc->delay_value = ((devc->limit_samples - 1) / 100.0) * devc->capture_ratio;
 389
 390         uint8_t buf;
 391         buf = CMD_CFG_LA;
 392         tcp_send(tcp, &buf, 1);
 393         buf = CMD_LA_DELAY;
 394         tcp_send(tcp, &buf, 1);
 395
 396         uint8_t delay_buf[4] = { devc->delay_value & 0x000000ff,
 397                 (devc->delay_value >> 8) & 0x000000ff,
 398                 (devc->delay_value >> 16) & 0x000000ff,
 399                 (devc->delay_value >> 24) & 0x000000ff
 400         };
 401
 402         for (uint64_t i = 0; i < devc->addr_width_bytes; i++)
 403                 send_escaping(tcp, &(delay_buf[devc->addr_width_bytes - 1 - i]), 1);
 404
 405         return SR_OK;
 406 }
 407
 408 SR_PRIV int ipdbg_la_send_trigger(struct dev_context *devc,
 409         struct ipdbg_la_tcp *tcp)
 410 {
 411         uint8_t buf;
 412
 413         /* Mask */
 414         buf = CMD_CFG_TRIGGER;
 415         tcp_send(tcp, &buf, 1);
 416         buf = CMD_TRIG_MASKS;
 417         tcp_send(tcp, &buf, 1);
 418         buf = CMD_TRIG_MASK;
 419         tcp_send(tcp, &buf, 1);
 420
 421         for (size_t i = 0; i < devc->data_width_bytes; i++)
 422                 send_escaping(tcp,
 423                         devc->trigger_mask + devc->data_width_bytes - 1 - i, 1);
 424
 425         /* Value */
 426         buf = CMD_CFG_TRIGGER;
 427         tcp_send(tcp, &buf, 1);
 428         buf = CMD_TRIG_MASKS;
 429         tcp_send(tcp, &buf, 1);
 430         buf = CMD_TRIG_VALUE;
 431         tcp_send(tcp, &buf, 1);
 432
 433         for (size_t i = 0; i < devc->data_width_bytes; i++)
 434                 send_escaping(tcp,
 435                         devc->trigger_value + devc->data_width_bytes - 1 - i, 1);
 436
 437         /* Mask_last */
 438         buf = CMD_CFG_TRIGGER;
 439         tcp_send(tcp, &buf, 1);
 440         buf = CMD_TRIG_MASKS_LAST;
 441         tcp_send(tcp, &buf, 1);
 442         buf = CMD_TRIG_MASK_LAST;
 443         tcp_send(tcp, &buf, 1);
 444
 445         for (size_t i = 0; i < devc->data_width_bytes; i++)
 446                 send_escaping(tcp,
 447                         devc->trigger_mask_last + devc->data_width_bytes - 1 - i, 1);
 448
 449         /* Value_last */
 450         buf = CMD_CFG_TRIGGER;
 451         tcp_send(tcp, &buf, 1);
 452         buf = CMD_TRIG_MASKS_LAST;
 453         tcp_send(tcp, &buf, 1);
 454         buf = CMD_TRIG_VALUE_LAST;
 455         tcp_send(tcp, &buf, 1);
 456
 457         for (size_t i = 0; i < devc->data_width_bytes; i++)
 458                 send_escaping(tcp,
 459                         devc->trigger_value_last + devc->data_width_bytes - 1 - i, 1);
 460
 461         /* Edge_mask */
 462         buf = CMD_CFG_TRIGGER;
 463         tcp_send(tcp, &buf, 1);
 464         buf = CMD_TRIG_SELECT_EDGE_MASK;
 465         tcp_send(tcp, &buf, 1);
 466         buf = CMD_TRIG_SET_EDGE_MASK;
 467         tcp_send(tcp, &buf, 1);
 468
 469         for (size_t i = 0; i < devc->data_width_bytes; i++)
 470                 send_escaping(tcp,
 471                         devc->trigger_edge_mask + devc->data_width_bytes - 1 - i, 1);
 472
 473         return SR_OK;
 474 }
 475
 476 SR_PRIV void ipdbg_la_get_addrwidth_and_datawidth(
 477         struct ipdbg_la_tcp *tcp, struct dev_context *devc)
 478 {
 479         uint8_t buf[8];
 480         uint8_t read_cmd = CMD_GET_BUS_WIDTHS;
 481
 482         if (tcp_send(tcp, &read_cmd, 1) != SR_OK)
 483                 sr_warn("Can't send read command");
 484
 485         if (tcp_receive_blocking(tcp, buf, 8) != 8)
 486                 sr_warn("Can't get address and data width from device");
 487
 488         devc->data_width = buf[0] & 0x000000FF;
 489         devc->data_width |= (buf[1] << 8) & 0x0000FF00;
 490         devc->data_width |= (buf[2] << 16) & 0x00FF0000;
 491         devc->data_width |= (buf[3] << 24) & 0xFF000000;
 492
 493         devc->addr_width = buf[4] & 0x000000FF;
 494         devc->addr_width |= (buf[5] << 8) & 0x0000FF00;
 495         devc->addr_width |= (buf[6] << 16) & 0x00FF0000;
 496         devc->addr_width |= (buf[7] << 24) & 0xFF000000;
 497
 498         const uint8_t host_word_size = 8;
 499
 500         devc->data_width_bytes =
 501                 (devc->data_width + host_word_size - 1) / host_word_size;
 502         devc->addr_width_bytes =
 503                 (devc->addr_width + host_word_size - 1) / host_word_size;
 504
 505         devc->limit_samples_max = (0x01 << devc->addr_width);
 506         devc->limit_samples = devc->limit_samples_max;
 507
 508         devc->trigger_mask = g_malloc0(devc->data_width_bytes);
 509         devc->trigger_value = g_malloc0(devc->data_width_bytes);
 510         devc->trigger_mask_last = g_malloc0(devc->data_width_bytes);
 511         devc->trigger_value_last = g_malloc0(devc->data_width_bytes);
 512         devc->trigger_edge_mask = g_malloc0(devc->data_width_bytes);
 513 }
 514
 515 SR_PRIV struct dev_context *ipdbg_la_dev_new(void)
 516 {
 517         struct dev_context *devc;
 518
 519         devc = g_malloc0(sizeof(struct dev_context));
 520         devc->capture_ratio = 50;
 521
 522         return devc;
 523 }
 524
 525 SR_PRIV int ipdbg_la_send_reset(struct ipdbg_la_tcp *tcp)
 526 {
 527         uint8_t buf = CMD_RESET;
 528         if (tcp_send(tcp, &buf, 1) != SR_OK)
 529                 sr_warn("Couldn't send reset");
 530
 531         return SR_OK;
 532 }
 533
 534 SR_PRIV int ipdbg_la_request_id(struct ipdbg_la_tcp *tcp)
 535 {
 536         uint8_t buf = CMD_GET_LA_ID;
 537         if (tcp_send(tcp, &buf, 1) != SR_OK)
 538                 sr_warn("Couldn't send ID request");
 539
 540         char id[4];
 541         if (tcp_receive_blocking(tcp, (uint8_t *)id, 4) != 4) {
 542                 sr_err("Couldn't read device ID");
 543                 return SR_ERR;
 544         }
 545
 546         if (strncmp(id, "IDBG", 4)) {
 547                 sr_err("Invalid device ID: expected 'IDBG', got '%c%c%c%c'.",
 548                         id[0], id[1], id[2], id[3]);
 549                 return SR_ERR;
 550         }
 551
 552         return SR_OK;
 553 }
 554
 555 SR_PRIV void ipdbg_la_abort_acquisition(const struct sr_dev_inst *sdi)
 556 {
 557         struct ipdbg_la_tcp *tcp = sdi->conn;
 558
 559         sr_session_source_remove(sdi->session, tcp->socket);
 560
 561         std_session_send_df_end(sdi);
 562 }
 563
 564 SR_PRIV int ipdbg_la_send_start(struct ipdbg_la_tcp *tcp)
 565 {
 566         uint8_t buf = CMD_START;
 567
 568         if (tcp_send(tcp, &buf, 1) != SR_OK)
 569                 sr_warn("Couldn't send start");
 570
 571         return SR_OK;
 572 }