| 1 | /* purge_test.c |
| 2 | * |
| 3 | * Test for purge TX/RX functions. |
| 4 | * |
| 5 | * The chip must be wired to loop TX data to RX data (loopback). |
| 6 | * |
| 7 | * This program works with "standard" linux drivers and the FTDI1 library. |
| 8 | * |
| 9 | * Usage: purge_test [-b baud] [-i interface] [-n msg-size] [-N note] device-specifier |
| 10 | * See usage below for more information on command usage. |
| 11 | * |
| 12 | * This program works well with the FT4231H which is newer and has large |
| 13 | * FIFOs. This program does not work well with FT232, either pre or post |
| 14 | * switching the SIO_RESET_PURGE_TX/SIO_RESET_PURGE_RX values. |
| 15 | * |
| 16 | * This needs testing with other devices, which I do not have. |
| 17 | */ |
| 18 | #include <stdio.h> |
| 19 | #include <stdlib.h> |
| 20 | #include <stdint.h> |
| 21 | #include <string.h> |
| 22 | #include <unistd.h> |
| 23 | #include <getopt.h> |
| 24 | #include <signal.h> |
| 25 | #include <errno.h> |
| 26 | /* Prevent deprecated messages when building library */ |
| 27 | #define _FTDI_DISABLE_DEPRECATED |
| 28 | #include <ftdi.h> |
| 29 | |
| 30 | #include <termios.h> // For baudcodes & linux UARTs |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <fcntl.h> |
| 34 | |
| 35 | |
| 36 | static struct ftdi_context *ftdi = NULL; |
| 37 | static int dev_fd = -1; |
| 38 | static char * dev_string = NULL; |
| 39 | static int latency_specified = 0; |
| 40 | static int latency = 5; |
| 41 | static int baud = 9600; |
| 42 | static int baud_code = -1; |
| 43 | static enum ftdi_interface interface = INTERFACE_A; |
| 44 | static int msg_size = 80; |
| 45 | static int broken_purge_test = 0; |
| 46 | |
| 47 | static const int latency_min = 2; |
| 48 | static const int latency_max = 255; |
| 49 | |
| 50 | static volatile long long usec_test_start; |
| 51 | |
| 52 | |
| 53 | |
| 54 | static int ascii2int(const char * str, const char * pgm_name); |
| 55 | static int baud_2_baud_code(int baud); |
| 56 | static long int char_cnt_2_usec(int char_count); |
| 57 | static long int drain(); |
| 58 | static int flush(int queue_selector); |
| 59 | static long long int get_time_usec(); |
| 60 | |
| 61 | static const int flushQueueSelector[] = { |
| 62 | TCIFLUSH, TCOFLUSH, TCIOFLUSH }; /* See /usr/include/bits/termios.h */ |
| 63 | static const char * flushTestName[] = { |
| 64 | "Input-only", "Output-only", "Input+Output" }; |
| 65 | static const char * expected[] = { |
| 66 | "last portion of message", |
| 67 | "first portion of message", |
| 68 | "mid-message characters", |
| 69 | }; |
| 70 | |
| 71 | |
| 72 | static const char * chip_types[] = { |
| 73 | "am", |
| 74 | "bm", |
| 75 | "2232C", |
| 76 | "R", |
| 77 | "2232H", |
| 78 | "4232H", |
| 79 | "232H", |
| 80 | "230X", |
| 81 | }; |
| 82 | |
| 83 | #ifndef ARRAY_SIZE |
| 84 | # define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) |
| 85 | #endif |
| 86 | |
| 87 | |
| 88 | |
| 89 | /********************************************************************** |
| 90 | */ |
| 91 | static void |
| 92 | usage(const char *argv0) |
| 93 | { |
| 94 | fprintf(stderr, |
| 95 | "Usage: %s [options...] device-specifier\n" |
| 96 | "Flush test for UARTS.\n" |
| 97 | " with loopback connector\n" |
| 98 | " [-b baud] baud rate (e.g., 300, 600, 1200, ...230400)\n" |
| 99 | " [-i {a|b|c|d}] FTDI interface for chips which have multiple UARTS\n" |
| 100 | " [-l latency] Latency (%d..%d)\n" |
| 101 | " [-n msg-size] Number of bytes in test message\n" |
| 102 | " [-N note] Note for the output\n" |
| 103 | " [-P] Use broken libftdi1 purge methods (over new flush)\n" |
| 104 | "\n" |
| 105 | " device-specifier String specifying the UART. If the first character\n" |
| 106 | " is the '/' character, the program assumes a Linux UART\n" |
| 107 | " is to be tested and the string would be something like\n" |
| 108 | " '/dev/ttyS0' or '/dev/ttyUSB0'. Otherwise, the program\n" |
| 109 | " assumes an FTDI device is being tested with the FTDI1\n" |
| 110 | " library. The device-specifier must be a string\n" |
| 111 | " accepted by the ftdi_usb_open_string function. An\n" |
| 112 | " example would be 'i:0x0403:0x6011[:index]'.\n" |
| 113 | "\n" |
| 114 | "NOTE: To function correctly, this program requires a loopback connector\n" |
| 115 | " attached to the UART under test.\n" |
| 116 | "\n" |
| 117 | "Adapted from stream_test.c 2018. Eric Schott <els6@psu.edu>\n" |
| 118 | "Copyright (C) 2009 Micah Dowty <micah@navi.cx>\n" |
| 119 | "Adapted for use with libftdi (C) 2010 Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>\n", |
| 120 | argv0, latency_min, latency_max); |
| 121 | exit(1); |
| 122 | } |
| 123 | |
| 124 | |
| 125 | /********************************************************************** |
| 126 | */ |
| 127 | int main(int argc, char **argv) |
| 128 | { |
| 129 | int c, i; |
| 130 | int option_index; |
| 131 | int test; |
| 132 | unsigned char * msg; |
| 133 | unsigned char * retMsg; |
| 134 | char * note = NULL; |
| 135 | char * note_default = NULL; |
| 136 | size_t retMsgSize; |
| 137 | long int msg_xmit_time_us; |
| 138 | static struct option long_options[] = {{NULL},}; |
| 139 | |
| 140 | while ((c = getopt_long(argc, argv, "n:b:i:l:N:P", long_options, &option_index)) !=- 1) |
| 141 | switch (c) |
| 142 | { |
| 143 | case -1: |
| 144 | break; |
| 145 | case 'b': |
| 146 | baud = ascii2int(optarg, argv[0]); |
| 147 | break; |
| 148 | case 'i': |
| 149 | if (optarg == NULL || strlen(optarg) != 1) |
| 150 | usage(argv[0]); |
| 151 | switch (optarg[0]) |
| 152 | { |
| 153 | case 'a': |
| 154 | case 'A': |
| 155 | interface = INTERFACE_A; |
| 156 | break; |
| 157 | |
| 158 | case 'b': |
| 159 | case 'B': |
| 160 | interface = INTERFACE_B; |
| 161 | break; |
| 162 | |
| 163 | case 'c': |
| 164 | case 'C': |
| 165 | interface = INTERFACE_C; |
| 166 | break; |
| 167 | |
| 168 | case 'd': |
| 169 | case 'D': |
| 170 | interface = INTERFACE_D; |
| 171 | break; |
| 172 | |
| 173 | default: |
| 174 | usage(argv[0]); |
| 175 | } |
| 176 | break; |
| 177 | case 'l': |
| 178 | latency = ascii2int(optarg, argv[0]); |
| 179 | if (latency < latency_min || latency > latency_max) |
| 180 | { |
| 181 | fprintf(stderr, "latency [-l] must be an integer in the range %d..%d\n", |
| 182 | latency_min, latency_max); |
| 183 | usage(argv[0]); |
| 184 | } |
| 185 | latency_specified = 1; |
| 186 | break; |
| 187 | case 'n': |
| 188 | msg_size = ascii2int(optarg, argv[0]); |
| 189 | if (msg_size < 1) |
| 190 | { |
| 191 | fprintf(stderr, "msg-size [-n] must be an integer greater than 0\n"); |
| 192 | usage(argv[0]); |
| 193 | } |
| 194 | break; |
| 195 | case 'N': |
| 196 | note = optarg; |
| 197 | break; |
| 198 | case 'P': |
| 199 | broken_purge_test = 1; |
| 200 | break; |
| 201 | default: |
| 202 | usage(argv[0]); |
| 203 | } |
| 204 | |
| 205 | if (optind == argc) |
| 206 | usage(argv[0]); |
| 207 | |
| 208 | if (optind == argc - 1) |
| 209 | { |
| 210 | // Exactly one extra argument- a dump file |
| 211 | dev_string = argv[optind]; |
| 212 | } |
| 213 | else if (optind < argc) |
| 214 | { |
| 215 | // Too many extra args |
| 216 | usage(argv[0]); |
| 217 | } |
| 218 | |
| 219 | baud_code = baud_2_baud_code(baud); |
| 220 | if (baud_code < 1) |
| 221 | { |
| 222 | fprintf(stderr, "Invalid baud [-b]\n"); |
| 223 | usage(argv[0]); |
| 224 | } |
| 225 | |
| 226 | if (dev_string[0] == '/') |
| 227 | { |
| 228 | struct termios termios; |
| 229 | |
| 230 | if (latency_specified) { |
| 231 | fprintf(stderr, "Latency (-l) option not support on this device; ignored\n"); |
| 232 | } |
| 233 | |
| 234 | if (broken_purge_test) { |
| 235 | fprintf(stderr, "Broken-purge (-P) option not support with Linux kernel driver\n"); |
| 236 | return EXIT_FAILURE; |
| 237 | } |
| 238 | |
| 239 | dev_fd = open(dev_string, O_NOCTTY | O_RDWR); |
| 240 | if (dev_fd < 0) |
| 241 | { |
| 242 | fprintf(stderr, "Error opening Linux device \"%s\": %s\n", |
| 243 | dev_string, strerror(errno)); |
| 244 | return EXIT_FAILURE; |
| 245 | } |
| 246 | |
| 247 | if (! isatty(dev_fd)) |
| 248 | { |
| 249 | fprintf(stderr, "Not a TTY device: \"%s\"\n", dev_string); |
| 250 | return EXIT_FAILURE; |
| 251 | } |
| 252 | |
| 253 | if (tcgetattr(dev_fd, &termios) == -1) |
| 254 | { |
| 255 | fprintf(stderr, "Error getting TTY attributes for \"%s\": %s\n", |
| 256 | dev_string, strerror(errno)); |
| 257 | return EXIT_FAILURE; |
| 258 | } |
| 259 | |
| 260 | note_default = "Linux kernel driver"; |
| 261 | |
| 262 | cfmakeraw(&termios); |
| 263 | |
| 264 | termios.c_cflag &= |
| 265 | ~(CSTOPB | CRTSCTS); |
| 266 | |
| 267 | termios.c_cflag &= ~CSIZE; |
| 268 | termios.c_cflag |= CS8; |
| 269 | |
| 270 | cfsetspeed(&termios, baud_code); |
| 271 | |
| 272 | termios.c_cflag |= |
| 273 | CLOCAL; |
| 274 | |
| 275 | termios.c_cc[VMIN] = 1; // Character at a time input |
| 276 | termios.c_cc[VTIME] = 0; // with blocking |
| 277 | |
| 278 | if (tcsetattr(dev_fd, TCSAFLUSH, &termios) == -1) { |
| 279 | fprintf(stderr, "Error setting TTY attributes for \"%s\": %s\n", |
| 280 | dev_string, strerror(errno)); |
| 281 | return EXIT_FAILURE; |
| 282 | } |
| 283 | } |
| 284 | else |
| 285 | { |
| 286 | |
| 287 | if ((ftdi = ftdi_new()) == 0) |
| 288 | { |
| 289 | fprintf(stderr, "ftdi_new failed\n"); |
| 290 | return EXIT_FAILURE; |
| 291 | } |
| 292 | |
| 293 | if (ftdi_set_interface(ftdi, interface) < 0) |
| 294 | { |
| 295 | fprintf(stderr, "ftdi_set_interface failed\n"); |
| 296 | ftdi_free(ftdi); |
| 297 | return EXIT_FAILURE; |
| 298 | } |
| 299 | |
| 300 | if (ftdi_usb_open_string(ftdi, dev_string) < 0) |
| 301 | { |
| 302 | fprintf(stderr,"Error opening ftdi device \"%s\": %s\n", dev_string, |
| 303 | ftdi_get_error_string(ftdi)); |
| 304 | ftdi_free(ftdi); |
| 305 | return EXIT_FAILURE; |
| 306 | } |
| 307 | |
| 308 | if(ftdi_set_latency_timer(ftdi, (unsigned char) latency)) |
| 309 | { |
| 310 | if (latency_specified && |
| 311 | (ftdi->type == TYPE_AM || ftdi->type == TYPE_232H)) { |
| 312 | fprintf(stderr, "Latency (-l) option not support on this device; ignored\n"); |
| 313 | } else if (ftdi->type != TYPE_AM && ftdi->type != TYPE_232H) { |
| 314 | fprintf(stderr,"Error setting latency for ftdi device \"%s\" (%d): %s\n", |
| 315 | dev_string, ftdi->type, ftdi_get_error_string(ftdi)); |
| 316 | ftdi_free(ftdi); |
| 317 | return EXIT_FAILURE; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | if (ftdi_set_line_property2(ftdi, BITS_8, STOP_BIT_1, NONE, BREAK_OFF) < 0) |
| 322 | { |
| 323 | fprintf(stderr,"Error setting line properties ftdi device \"%s\": %s\n", dev_string, |
| 324 | ftdi_get_error_string(ftdi)); |
| 325 | ftdi_free(ftdi); |
| 326 | return EXIT_FAILURE; |
| 327 | } |
| 328 | |
| 329 | if (ftdi_set_baudrate(ftdi, baud) < 0) |
| 330 | { |
| 331 | fprintf(stderr,"Error setting baud rate for ftdi device \"%s\": %s\n", dev_string, |
| 332 | ftdi_get_error_string(ftdi)); |
| 333 | ftdi_free(ftdi); |
| 334 | return EXIT_FAILURE; |
| 335 | } |
| 336 | |
| 337 | if (ftdi_setflowctrl(ftdi, SIO_DISABLE_FLOW_CTRL)) |
| 338 | { |
| 339 | fprintf(stderr,"Error setting flow control for ftdi device \"%s\": %s\n", dev_string, |
| 340 | ftdi_get_error_string(ftdi)); |
| 341 | ftdi_free(ftdi); |
| 342 | return EXIT_FAILURE; |
| 343 | } |
| 344 | |
| 345 | if (broken_purge_test) |
| 346 | note_default = "libftdi w/ deprecated purge"; |
| 347 | else |
| 348 | note_default = "libftdi w/ new flush methods"; |
| 349 | } |
| 350 | |
| 351 | printf("Purge (tcflush) test for device %s\n", dev_string); |
| 352 | printf("Note: %s\n", (note ? note : note_default)); |
| 353 | |
| 354 | if (dev_fd < 0) |
| 355 | { |
| 356 | if (ftdi->type >0 && ftdi->type < ARRAY_SIZE(chip_types)) |
| 357 | printf("FTDI chip type is %d (%s)\n", |
| 358 | ftdi->type, chip_types[ftdi->type]); |
| 359 | else |
| 360 | printf("FTDI chip type is %d (unknown)\n", ftdi->type); |
| 361 | } |
| 362 | |
| 363 | printf("# purge_test" ); |
| 364 | for (c = 1; c < argc; ++c) |
| 365 | { |
| 366 | const char *p = argv[c]; |
| 367 | while (*p != '\0') |
| 368 | { |
| 369 | if (*p == ' ') |
| 370 | break; |
| 371 | ++p; |
| 372 | } |
| 373 | if (*p == ' ') |
| 374 | printf(" '%s'", argv[c]); |
| 375 | else |
| 376 | printf(" %s", argv[c]); |
| 377 | } |
| 378 | printf("\n"); |
| 379 | |
| 380 | msg_xmit_time_us = char_cnt_2_usec(msg_size); |
| 381 | printf("%d chars at %d baud takes about %.0f ms to transmit\n", msg_size, |
| 382 | baud, msg_xmit_time_us * .001); |
| 383 | |
| 384 | msg = malloc(msg_size + 1); |
| 385 | if (msg == NULL) |
| 386 | { |
| 387 | fprintf(stderr, "Could not allocate send message buffer\n"); |
| 388 | return EXIT_FAILURE; |
| 389 | } |
| 390 | |
| 391 | { |
| 392 | char dataChar = '0' + ((get_time_usec() / 1000) % 31); |
| 393 | char next = 'A'; |
| 394 | for (i = 0; i < msg_size; ++i) { |
| 395 | if (dataChar == '`') |
| 396 | { |
| 397 | msg[i] = next++; |
| 398 | ++dataChar; |
| 399 | } |
| 400 | else |
| 401 | msg[i] = dataChar++; |
| 402 | |
| 403 | if (dataChar > 'z') { |
| 404 | dataChar = '`'; |
| 405 | } |
| 406 | } |
| 407 | msg[msg_size] = '\0'; |
| 408 | } |
| 409 | |
| 410 | printf("TX Message is \"%s\"\n", msg); |
| 411 | |
| 412 | retMsgSize = 2 * msg_size; |
| 413 | retMsg = malloc(retMsgSize); |
| 414 | if (retMsg == NULL) |
| 415 | { |
| 416 | fprintf(stderr, "Could not allocate received message buffer\n"); |
| 417 | return EXIT_FAILURE; |
| 418 | } |
| 419 | |
| 420 | flush(TCIOFLUSH); |
| 421 | |
| 422 | for (test = 0; test <= 2; ++test) |
| 423 | { |
| 424 | long long usec_delay; |
| 425 | long long usec_to_now; |
| 426 | int rc; |
| 427 | |
| 428 | printf("\n******** Test purge %s; expect %s ********\n" |
| 429 | " -- Flushing UART\n", |
| 430 | flushTestName[test], expected[test]); |
| 431 | flush(TCIOFLUSH); |
| 432 | usleep(msg_xmit_time_us); |
| 433 | flush(TCIOFLUSH); |
| 434 | usleep(100000); |
| 435 | |
| 436 | usec_test_start = get_time_usec(); |
| 437 | if (dev_fd >= 0) |
| 438 | rc = write(dev_fd, msg, msg_size); |
| 439 | else |
| 440 | rc = ftdi_write_data(ftdi, msg, msg_size); |
| 441 | |
| 442 | if (rc != msg_size) |
| 443 | { |
| 444 | fprintf(stderr, "Data write was short: %d: %s\n", |
| 445 | rc, ftdi_get_error_string(ftdi)); |
| 446 | exit(1); |
| 447 | } |
| 448 | usec_to_now = get_time_usec() - usec_test_start; |
| 449 | usec_delay = msg_xmit_time_us / 2 - usec_to_now; |
| 450 | if (usec_delay < 0) |
| 451 | usec_delay = 0; |
| 452 | printf(" -- %9.1f ms Write completes; delaying to TX midpoint (%.1f ms)\n", |
| 453 | usec_to_now * .001, usec_delay * .001); |
| 454 | if (usec_delay > 0) |
| 455 | usleep(usec_delay); |
| 456 | |
| 457 | printf(" -- %9.1f ms Issuing %s flush (purge)\n", |
| 458 | (get_time_usec() - usec_test_start) * .001, |
| 459 | flushTestName[test]); |
| 460 | flush(flushQueueSelector[test]); |
| 461 | |
| 462 | printf(" -- %9.1f ms Calling drain to wait for transmit to complete\n", |
| 463 | (get_time_usec() - usec_test_start) * .001); |
| 464 | drain(); |
| 465 | |
| 466 | usec_to_now = get_time_usec() - usec_test_start; |
| 467 | |
| 468 | /* If input only flush, check drain time. */ |
| 469 | if (flushQueueSelector[test] == TCIFLUSH && |
| 470 | usec_to_now < (msg_xmit_time_us * 90ll) / 100ll) |
| 471 | { |
| 472 | usec_delay = (msg_xmit_time_us * 110ll) / 100ll - usec_to_now; |
| 473 | printf(" -- %9.1f ms Drain() completed too early; expected at least %.1f ms\n" |
| 474 | " Delaying for %.1f ms\n", |
| 475 | usec_to_now * .001, |
| 476 | ((msg_xmit_time_us * 90ll) / 100ll) * .001, |
| 477 | usec_delay * .001); |
| 478 | usleep(usec_delay); |
| 479 | } |
| 480 | else |
| 481 | { |
| 482 | printf(" -- %9.1f ms Drain() reports completed; timing OK; delaying for 4 bytes\n", |
| 483 | (get_time_usec() - usec_test_start) * .001); |
| 484 | usleep(char_cnt_2_usec(4)); |
| 485 | } |
| 486 | |
| 487 | printf(" -- %9.1f ms Reading data.\n", |
| 488 | (get_time_usec() - usec_test_start) * .001); |
| 489 | if (dev_fd >= 0) |
| 490 | rc = read(dev_fd, retMsg, retMsgSize); |
| 491 | else |
| 492 | rc = ftdi_read_data(ftdi, retMsg, retMsgSize - 1); |
| 493 | |
| 494 | usec_to_now = get_time_usec() - usec_test_start; |
| 495 | if (rc < 0) |
| 496 | { |
| 497 | fprintf(stderr, " -- %9.1f ms Read returned error %s\n", |
| 498 | usec_to_now * .001, |
| 499 | (dev_fd >= 0 ? strerror(errno) : ftdi_get_error_string(ftdi))); |
| 500 | exit(1); |
| 501 | } |
| 502 | retMsg[rc] = '\0'; |
| 503 | printf(" -- %9.1f ms Read returns %d bytes; msg: \"%s\"\n", |
| 504 | usec_to_now * .001, rc, retMsg); |
| 505 | |
| 506 | usleep(char_cnt_2_usec(10)); |
| 507 | |
| 508 | } |
| 509 | |
| 510 | |
| 511 | if (dev_fd >= 0) |
| 512 | { |
| 513 | close(dev_fd); |
| 514 | } |
| 515 | else |
| 516 | { |
| 517 | ftdi_usb_close(ftdi); |
| 518 | ftdi_free(ftdi); |
| 519 | } |
| 520 | |
| 521 | exit (0); |
| 522 | } |
| 523 | |
| 524 | /********************************************************************** |
| 525 | */ |
| 526 | static int ascii2int(const char * str, const char * pgm_name) |
| 527 | { |
| 528 | int rc; |
| 529 | char * endptr; |
| 530 | if (str == NULL || strlen(str) == 0) |
| 531 | usage(pgm_name); |
| 532 | rc = strtol(str, &endptr, 10); |
| 533 | if (endptr == str || *endptr != '\0') |
| 534 | usage(pgm_name); |
| 535 | return rc; |
| 536 | } |
| 537 | |
| 538 | |
| 539 | /********************************************************************** |
| 540 | */ |
| 541 | static struct Baud_Table { |
| 542 | int32_t baud, baud_code; |
| 543 | } baud_table [] = |
| 544 | { |
| 545 | { 50, B50 }, |
| 546 | { 75, B75 }, |
| 547 | { 110, B110 }, |
| 548 | { 134, B134 }, |
| 549 | { 150, B150 }, |
| 550 | { 200, B200 }, |
| 551 | { 300, B300 }, |
| 552 | { 600, B600 }, |
| 553 | { 1200, B1200 }, |
| 554 | { 1800, B1800 }, |
| 555 | { 2400, B2400 }, |
| 556 | { 4800, B4800 }, |
| 557 | { 9600, B9600 }, |
| 558 | { 19200, B19200 }, |
| 559 | { 38400, B38400 }, |
| 560 | { 57600, B57600 }, |
| 561 | { 115200, B115200 }, |
| 562 | { 230400, B230400 }, |
| 563 | { -1, -1, } |
| 564 | }; |
| 565 | |
| 566 | /********************************************************************** |
| 567 | */ |
| 568 | static int baud_2_baud_code(int baud) |
| 569 | { |
| 570 | struct Baud_Table *p; |
| 571 | |
| 572 | for (p = baud_table ; p->baud != -1; ++p) { |
| 573 | if (p->baud == baud) |
| 574 | break; |
| 575 | } |
| 576 | return p->baud_code; |
| 577 | } |
| 578 | |
| 579 | |
| 580 | static long int char_cnt_2_usec(int char_count) |
| 581 | { |
| 582 | long long bits = 8 + 1 + 1; /* Number of bits in each character */ |
| 583 | bits *= (char_count == 0 ? 1 : char_count); /* Total number of bits */ |
| 584 | bits *= 1000000; /* Convert to us */ |
| 585 | lldiv_t parts = lldiv(bits, baud); /* Number of us for message */ |
| 586 | return (parts.quot + 1); |
| 587 | } |
| 588 | |
| 589 | |
| 590 | static long int drain() |
| 591 | { |
| 592 | long int rc = 0; |
| 593 | long long start_time = get_time_usec(); |
| 594 | if (dev_fd >= 0) |
| 595 | rc = tcdrain(dev_fd); |
| 596 | else |
| 597 | { |
| 598 | long int sleep_interval = char_cnt_2_usec(10); |
| 599 | while (1) { |
| 600 | unsigned short modem_status = 0; |
| 601 | int rc = ftdi_poll_modem_status(ftdi, &modem_status); |
| 602 | if (rc < 0) |
| 603 | return -1; |
| 604 | if (modem_status & (1 << (6 + 8))) { |
| 605 | break; |
| 606 | } |
| 607 | usleep(sleep_interval); |
| 608 | } |
| 609 | } |
| 610 | if (rc < 0) |
| 611 | return rc; |
| 612 | usleep(char_cnt_2_usec(2)); |
| 613 | return get_time_usec() - start_time; |
| 614 | } |
| 615 | |
| 616 | |
| 617 | static int flush(int queue_selector) |
| 618 | { |
| 619 | int rc; |
| 620 | if (dev_fd >= 0) |
| 621 | rc = tcflush(dev_fd, queue_selector); |
| 622 | else if (! broken_purge_test) |
| 623 | { |
| 624 | switch (queue_selector) { |
| 625 | |
| 626 | case TCIOFLUSH: |
| 627 | rc = ftdi_tcioflush(ftdi); |
| 628 | break; |
| 629 | |
| 630 | case TCIFLUSH: |
| 631 | rc = ftdi_tciflush(ftdi); |
| 632 | break; |
| 633 | |
| 634 | case TCOFLUSH: |
| 635 | rc = ftdi_tcoflush(ftdi); |
| 636 | break; |
| 637 | |
| 638 | default: |
| 639 | errno = EINVAL; |
| 640 | return -1; |
| 641 | } |
| 642 | } |
| 643 | else |
| 644 | { |
| 645 | switch (queue_selector) { |
| 646 | |
| 647 | case TCIOFLUSH: |
| 648 | rc = ftdi_usb_purge_buffers(ftdi); |
| 649 | break; |
| 650 | |
| 651 | case TCIFLUSH: |
| 652 | rc = ftdi_usb_purge_rx_buffer(ftdi); |
| 653 | break; |
| 654 | |
| 655 | case TCOFLUSH: |
| 656 | rc = ftdi_usb_purge_tx_buffer(ftdi); |
| 657 | break; |
| 658 | |
| 659 | default: |
| 660 | errno = EINVAL; |
| 661 | return -1; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | return rc; |
| 666 | } |
| 667 | |
| 668 | |
| 669 | static long long int get_time_usec() |
| 670 | { |
| 671 | struct timeval tv; |
| 672 | gettimeofday(&tv, NULL); |
| 673 | return tv.tv_sec * 1000000ll + tv.tv_usec; |
| 674 | } |