tools/spi/spidev_test.c

   1 /*
   2  * SPI testing utility (using spidev driver)
   3  *
   4  * Copyright (c) 2007  MontaVista Software, Inc.
   5  * Copyright (c) 2007  Anton Vorontsov <avorontsov@ru.mvista.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License.
  10  *
  11  * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
  12  */
  13
  14 #include <stdint.h>
  15 #include <unistd.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <getopt.h>
  20 #include <fcntl.h>
  21 #include <time.h>
  22 #include <sys/ioctl.h>
  23 #include <linux/ioctl.h>
  24 #include <sys/stat.h>
  25 #include <linux/types.h>
  26 #include <linux/spi/spidev.h>
  27
  28 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
  29
  30 static void pabort(const char *s)
  31 {
  32         perror(s);
  33         abort();
  34 }
  35
  36 static const char *device = "/dev/spidev1.1";
  37 static uint32_t mode;
  38 static uint8_t bits = 8;
  39 static char *input_file;
  40 static char *output_file;
  41 static uint32_t speed = 500000;
  42 static uint16_t delay;
  43 static int verbose;
  44 static int transfer_size;
  45 static int iterations;
  46 static int interval = 5; /* interval in seconds for showing transfer rate */
  47
  48 uint8_t default_tx[] = {
  49         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  50         0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
  51         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  52         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  53         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  54         0xF0, 0x0D,
  55 };
  56
  57 uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
  58 char *input_tx;
  59
  60 static void hex_dump(const void *src, size_t length, size_t line_size,
  61                      char *prefix)
  62 {
  63         int i = 0;
  64         const unsigned char *address = src;
  65         const unsigned char *line = address;
  66         unsigned char c;
  67
  68         printf("%s | ", prefix);
  69         while (length-- > 0) {
  70                 printf("%02X ", *address++);
  71                 if (!(++i % line_size) || (length == 0 && i % line_size)) {
  72                         if (length == 0) {
  73                                 while (i++ % line_size)
  74                                         printf("__ ");
  75                         }
  76                         printf(" | ");  /* right close */
  77                         while (line < address) {
  78                                 c = *line++;
  79                                 printf("%c", (c < 33 || c == 255) ? 0x2E : c);
  80                         }
  81                         printf("\n");
  82                         if (length > 0)
  83                                 printf("%s | ", prefix);
  84                 }
  85         }
  86 }
  87
  88 /*
  89  *  Unescape - process hexadecimal escape character
  90  *      converts shell input "\x23" -> 0x23
  91  */
  92 static int unescape(char *_dst, char *_src, size_t len)
  93 {
  94         int ret = 0;
  95         int match;
  96         char *src = _src;
  97         char *dst = _dst;
  98         unsigned int ch;
  99
 100         while (*src) {
 101                 if (*src == '\\' && *(src+1) == 'x') {
 102                         match = sscanf(src + 2, "%2x", &ch);
 103                         if (!match)
 104                                 pabort("malformed input string");
 105
 106                         src += 4;
 107                         *dst++ = (unsigned char)ch;
 108                 } else {
 109                         *dst++ = *src++;
 110                 }
 111                 ret++;
 112         }
 113         return ret;
 114 }
 115
 116 static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
 117 {
 118         int ret;
 119         int out_fd;
 120         struct spi_ioc_transfer tr = {
 121                 .tx_buf = (unsigned long)tx,
 122                 .rx_buf = (unsigned long)rx,
 123                 .len = len,
 124                 .delay_usecs = delay,
 125                 .speed_hz = speed,
 126                 .bits_per_word = bits,
 127         };
 128
 129         if (mode & SPI_TX_QUAD)
 130                 tr.tx_nbits = 4;
 131         else if (mode & SPI_TX_DUAL)
 132                 tr.tx_nbits = 2;
 133         if (mode & SPI_RX_QUAD)
 134                 tr.rx_nbits = 4;
 135         else if (mode & SPI_RX_DUAL)
 136                 tr.rx_nbits = 2;
 137         if (!(mode & SPI_LOOP)) {
 138                 if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
 139                         tr.rx_buf = 0;
 140                 else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
 141                         tr.tx_buf = 0;
 142         }
 143
 144         ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
 145         if (ret < 1)
 146                 pabort("can't send spi message");
 147
 148         if (verbose)
 149                 hex_dump(tx, len, 32, "TX");
 150
 151         if (output_file) {
 152                 out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 153                 if (out_fd < 0)
 154                         pabort("could not open output file");
 155
 156                 ret = write(out_fd, rx, len);
 157                 if (ret != len)
 158                         pabort("not all bytes written to output file");
 159
 160                 close(out_fd);
 161         }
 162
 163         if (verbose)
 164                 hex_dump(rx, len, 32, "RX");
 165 }
 166
 167 static void print_usage(const char *prog)
 168 {
 169         printf("Usage: %s [-DsbdlHOLC3vpNR24SI]\n", prog);
 170         puts("  -D --device   device to use (default /dev/spidev1.1)\n"
 171              "  -s --speed    max speed (Hz)\n"
 172              "  -d --delay    delay (usec)\n"
 173              "  -b --bpw      bits per word\n"
 174              "  -i --input    input data from a file (e.g. \"test.bin\")\n"
 175              "  -o --output   output data to a file (e.g. \"results.bin\")\n"
 176              "  -l --loop     loopback\n"
 177              "  -H --cpha     clock phase\n"
 178              "  -O --cpol     clock polarity\n"
 179              "  -L --lsb      least significant bit first\n"
 180              "  -C --cs-high  chip select active high\n"
 181              "  -3 --3wire    SI/SO signals shared\n"
 182              "  -v --verbose  Verbose (show tx buffer)\n"
 183              "  -p            Send data (e.g. \"1234\\xde\\xad\")\n"
 184              "  -N --no-cs    no chip select\n"
 185              "  -R --ready    slave pulls low to pause\n"
 186              "  -2 --dual     dual transfer\n"
 187              "  -4 --quad     quad transfer\n"
 188              "  -S --size     transfer size\n"
 189              "  -I --iter     iterations\n");
 190         exit(1);
 191 }
 192
 193 static void parse_opts(int argc, char *argv[])
 194 {
 195         while (1) {
 196                 static const struct option lopts[] = {
 197                         { "device",  1, 0, 'D' },
 198                         { "speed",   1, 0, 's' },
 199                         { "delay",   1, 0, 'd' },
 200                         { "bpw",     1, 0, 'b' },
 201                         { "input",   1, 0, 'i' },
 202                         { "output",  1, 0, 'o' },
 203                         { "loop",    0, 0, 'l' },
 204                         { "cpha",    0, 0, 'H' },
 205                         { "cpol",    0, 0, 'O' },
 206                         { "lsb",     0, 0, 'L' },
 207                         { "cs-high", 0, 0, 'C' },
 208                         { "3wire",   0, 0, '3' },
 209                         { "no-cs",   0, 0, 'N' },
 210                         { "ready",   0, 0, 'R' },
 211                         { "dual",    0, 0, '2' },
 212                         { "verbose", 0, 0, 'v' },
 213                         { "quad",    0, 0, '4' },
 214                         { "size",    1, 0, 'S' },
 215                         { "iter",    1, 0, 'I' },
 216                         { NULL, 0, 0, 0 },
 217                 };
 218                 int c;
 219
 220                 c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:vS:I:",
 221                                 lopts, NULL);
 222
 223                 if (c == -1)
 224                         break;
 225
 226                 switch (c) {
 227                 case 'D':
 228                         device = optarg;
 229                         break;
 230                 case 's':
 231                         speed = atoi(optarg);
 232                         break;
 233                 case 'd':
 234                         delay = atoi(optarg);
 235                         break;
 236                 case 'b':
 237                         bits = atoi(optarg);
 238                         break;
 239                 case 'i':
 240                         input_file = optarg;
 241                         break;
 242                 case 'o':
 243                         output_file = optarg;
 244                         break;
 245                 case 'l':
 246                         mode |= SPI_LOOP;
 247                         break;
 248                 case 'H':
 249                         mode |= SPI_CPHA;
 250                         break;
 251                 case 'O':
 252                         mode |= SPI_CPOL;
 253                         break;
 254                 case 'L':
 255                         mode |= SPI_LSB_FIRST;
 256                         break;
 257                 case 'C':
 258                         mode |= SPI_CS_HIGH;
 259                         break;
 260                 case '3':
 261                         mode |= SPI_3WIRE;
 262                         break;
 263                 case 'N':
 264                         mode |= SPI_NO_CS;
 265                         break;
 266                 case 'v':
 267                         verbose = 1;
 268                         break;
 269                 case 'R':
 270                         mode |= SPI_READY;
 271                         break;
 272                 case 'p':
 273                         input_tx = optarg;
 274                         break;
 275                 case '2':
 276                         mode |= SPI_TX_DUAL;
 277                         break;
 278                 case '4':
 279                         mode |= SPI_TX_QUAD;
 280                         break;
 281                 case 'S':
 282                         transfer_size = atoi(optarg);
 283                         break;
 284                 case 'I':
 285                         iterations = atoi(optarg);
 286                         break;
 287                 default:
 288                         print_usage(argv[0]);
 289                         break;
 290                 }
 291         }
 292         if (mode & SPI_LOOP) {
 293                 if (mode & SPI_TX_DUAL)
 294                         mode |= SPI_RX_DUAL;
 295                 if (mode & SPI_TX_QUAD)
 296                         mode |= SPI_RX_QUAD;
 297         }
 298 }
 299
 300 static void transfer_escaped_string(int fd, char *str)
 301 {
 302         size_t size = strlen(str);
 303         uint8_t *tx;
 304         uint8_t *rx;
 305
 306         tx = malloc(size);
 307         if (!tx)
 308                 pabort("can't allocate tx buffer");
 309
 310         rx = malloc(size);
 311         if (!rx)
 312                 pabort("can't allocate rx buffer");
 313
 314         size = unescape((char *)tx, str, size);
 315         transfer(fd, tx, rx, size);
 316         free(rx);
 317         free(tx);
 318 }
 319
 320 static void transfer_file(int fd, char *filename)
 321 {
 322         ssize_t bytes;
 323         struct stat sb;
 324         int tx_fd;
 325         uint8_t *tx;
 326         uint8_t *rx;
 327
 328         if (stat(filename, &sb) == -1)
 329                 pabort("can't stat input file");
 330
 331         tx_fd = open(filename, O_RDONLY);
 332         if (tx_fd < 0)
 333                 pabort("can't open input file");
 334
 335         tx = malloc(sb.st_size);
 336         if (!tx)
 337                 pabort("can't allocate tx buffer");
 338
 339         rx = malloc(sb.st_size);
 340         if (!rx)
 341                 pabort("can't allocate rx buffer");
 342
 343         bytes = read(tx_fd, tx, sb.st_size);
 344         if (bytes != sb.st_size)
 345                 pabort("failed to read input file");
 346
 347         transfer(fd, tx, rx, sb.st_size);
 348         free(rx);
 349         free(tx);
 350         close(tx_fd);
 351 }
 352
 353 static uint64_t _read_count;
 354 static uint64_t _write_count;
 355
 356 static void show_transfer_rate(void)
 357 {
 358         static uint64_t prev_read_count, prev_write_count;
 359         double rx_rate, tx_rate;
 360
 361         rx_rate = ((_read_count - prev_read_count) * 8) / (interval*1000.0);
 362         tx_rate = ((_write_count - prev_write_count) * 8) / (interval*1000.0);
 363
 364         printf("rate: tx %.1fkbps, rx %.1fkbps\n", rx_rate, tx_rate);
 365
 366         prev_read_count = _read_count;
 367         prev_write_count = _write_count;
 368 }
 369
 370 static void transfer_buf(int fd, int len)
 371 {
 372         uint8_t *tx;
 373         uint8_t *rx;
 374         int i;
 375
 376         tx = malloc(len);
 377         if (!tx)
 378                 pabort("can't allocate tx buffer");
 379         for (i = 0; i < len; i++)
 380                 tx[i] = random();
 381
 382         rx = malloc(len);
 383         if (!rx)
 384                 pabort("can't allocate rx buffer");
 385
 386         transfer(fd, tx, rx, len);
 387
 388         _write_count += len;
 389         _read_count += len;
 390
 391         if (mode & SPI_LOOP) {
 392                 if (memcmp(tx, rx, len)) {
 393                         fprintf(stderr, "transfer error !\n");
 394                         hex_dump(tx, len, 32, "TX");
 395                         hex_dump(rx, len, 32, "RX");
 396                         exit(1);
 397                 }
 398         }
 399
 400         free(rx);
 401         free(tx);
 402 }
 403
 404 int main(int argc, char *argv[])
 405 {
 406         int ret = 0;
 407         int fd;
 408
 409         parse_opts(argc, argv);
 410
 411         fd = open(device, O_RDWR);
 412         if (fd < 0)
 413                 pabort("can't open device");
 414
 415         /*
 416          * spi mode
 417          */
 418         ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
 419         if (ret == -1)
 420                 pabort("can't set spi mode");
 421
 422         ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
 423         if (ret == -1)
 424                 pabort("can't get spi mode");
 425
 426         /*
 427          * bits per word
 428          */
 429         ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
 430         if (ret == -1)
 431                 pabort("can't set bits per word");
 432
 433         ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
 434         if (ret == -1)
 435                 pabort("can't get bits per word");
 436
 437         /*
 438          * max speed hz
 439          */
 440         ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
 441         if (ret == -1)
 442                 pabort("can't set max speed hz");
 443
 444         ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
 445         if (ret == -1)
 446                 pabort("can't get max speed hz");
 447
 448         printf("spi mode: 0x%x\n", mode);
 449         printf("bits per word: %d\n", bits);
 450         printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
 451
 452         if (input_tx && input_file)
 453                 pabort("only one of -p and --input may be selected");
 454
 455         if (input_tx)
 456                 transfer_escaped_string(fd, input_tx);
 457         else if (input_file)
 458                 transfer_file(fd, input_file);
 459         else if (transfer_size) {
 460                 struct timespec last_stat;
 461
 462                 clock_gettime(CLOCK_MONOTONIC, &last_stat);
 463
 464                 while (iterations-- > 0) {
 465                         struct timespec current;
 466
 467                         transfer_buf(fd, transfer_size);
 468
 469                         clock_gettime(CLOCK_MONOTONIC, &current);
 470                         if (current.tv_sec - last_stat.tv_sec > interval) {
 471                                 show_transfer_rate();
 472                                 last_stat = current;
 473                         }
 474                 }
 475                 printf("total: tx %.1fKB, rx %.1fKB\n",
 476                        _write_count/1024.0, _read_count/1024.0);
 477         } else
 478                 transfer(fd, default_tx, default_rx, sizeof(default_tx));
 479
 480         close(fd);
 481
 482         return ret;
 483 }