tools/spi/spidev_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SPI testing utility (using spidev driver)
   4  *
   5  * Copyright (c) 2007  MontaVista Software, Inc.
   6  * Copyright (c) 2007  Anton Vorontsov <avorontsov@ru.mvista.com>
   7  *
   8  * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
   9  */
  10
  11 #include <stdint.h>
  12 #include <unistd.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <errno.h>
  17 #include <getopt.h>
  18 #include <fcntl.h>
  19 #include <time.h>
  20 #include <sys/ioctl.h>
  21 #include <linux/ioctl.h>
  22 #include <sys/stat.h>
  23 #include <linux/types.h>
  24 #include <linux/spi/spidev.h>
  25
  26 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
  27
  28 static void pabort(const char *s)
  29 {
  30         if (errno != 0)
  31                 perror(s);
  32         else
  33                 printf("%s\n", s);
  34
  35         abort();
  36 }
  37
  38 static const char *device = "/dev/spidev1.1";
  39 static uint32_t mode;
  40 static uint8_t bits = 8;
  41 static char *input_file;
  42 static char *output_file;
  43 static uint32_t speed = 500000;
  44 static uint16_t delay;
  45 static int verbose;
  46 static int transfer_size;
  47 static int iterations;
  48 static int interval = 5; /* interval in seconds for showing transfer rate */
  49
  50 uint8_t default_tx[] = {
  51         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  52         0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
  53         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  54         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  55         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  56         0xF0, 0x0D,
  57 };
  58
  59 uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
  60 char *input_tx;
  61
  62 static void hex_dump(const void *src, size_t length, size_t line_size,
  63                      char *prefix)
  64 {
  65         int i = 0;
  66         const unsigned char *address = src;
  67         const unsigned char *line = address;
  68         unsigned char c;
  69
  70         printf("%s | ", prefix);
  71         while (length-- > 0) {
  72                 printf("%02X ", *address++);
  73                 if (!(++i % line_size) || (length == 0 && i % line_size)) {
  74                         if (length == 0) {
  75                                 while (i++ % line_size)
  76                                         printf("__ ");
  77                         }
  78                         printf(" |");
  79                         while (line < address) {
  80                                 c = *line++;
  81                                 printf("%c", (c < 32 || c > 126) ? '.' : c);
  82                         }
  83                         printf("|\n");
  84                         if (length > 0)
  85                                 printf("%s | ", prefix);
  86                 }
  87         }
  88 }
  89
  90 /*
  91  *  Unescape - process hexadecimal escape character
  92  *      converts shell input "\x23" -> 0x23
  93  */
  94 static int unescape(char *_dst, char *_src, size_t len)
  95 {
  96         int ret = 0;
  97         int match;
  98         char *src = _src;
  99         char *dst = _dst;
 100         unsigned int ch;
 101
 102         while (*src) {
 103                 if (*src == '\\' && *(src+1) == 'x') {
 104                         match = sscanf(src + 2, "%2x", &ch);
 105                         if (!match)
 106                                 pabort("malformed input string");
 107
 108                         src += 4;
 109                         *dst++ = (unsigned char)ch;
 110                 } else {
 111                         *dst++ = *src++;
 112                 }
 113                 ret++;
 114         }
 115         return ret;
 116 }
 117
 118 static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
 119 {
 120         int ret;
 121         int out_fd;
 122         struct spi_ioc_transfer tr = {
 123                 .tx_buf = (unsigned long)tx,
 124                 .rx_buf = (unsigned long)rx,
 125                 .len = len,
 126                 .delay_usecs = delay,
 127                 .speed_hz = speed,
 128                 .bits_per_word = bits,
 129         };
 130
 131         if (mode & SPI_TX_QUAD)
 132                 tr.tx_nbits = 4;
 133         else if (mode & SPI_TX_DUAL)
 134                 tr.tx_nbits = 2;
 135         if (mode & SPI_RX_QUAD)
 136                 tr.rx_nbits = 4;
 137         else if (mode & SPI_RX_DUAL)
 138                 tr.rx_nbits = 2;
 139         if (!(mode & SPI_LOOP)) {
 140                 if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
 141                         tr.rx_buf = 0;
 142                 else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
 143                         tr.tx_buf = 0;
 144         }
 145
 146         ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
 147         if (ret < 1)
 148                 pabort("can't send spi message");
 149
 150         if (verbose)
 151                 hex_dump(tx, len, 32, "TX");
 152
 153         if (output_file) {
 154                 out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 155                 if (out_fd < 0)
 156                         pabort("could not open output file");
 157
 158                 ret = write(out_fd, rx, len);
 159                 if (ret != len)
 160                         pabort("not all bytes written to output file");
 161
 162                 close(out_fd);
 163         }
 164
 165         if (verbose)
 166                 hex_dump(rx, len, 32, "RX");
 167 }
 168
 169 static void print_usage(const char *prog)
 170 {
 171         printf("Usage: %s [-DsbdlHOLC3vpNR24SI]\n", prog);
 172         puts("  -D --device   device to use (default /dev/spidev1.1)\n"
 173              "  -s --speed    max speed (Hz)\n"
 174              "  -d --delay    delay (usec)\n"
 175              "  -b --bpw      bits per word\n"
 176              "  -i --input    input data from a file (e.g. \"test.bin\")\n"
 177              "  -o --output   output data to a file (e.g. \"results.bin\")\n"
 178              "  -l --loop     loopback\n"
 179              "  -H --cpha     clock phase\n"
 180              "  -O --cpol     clock polarity\n"
 181              "  -L --lsb      least significant bit first\n"
 182              "  -C --cs-high  chip select active high\n"
 183              "  -3 --3wire    SI/SO signals shared\n"
 184              "  -v --verbose  Verbose (show tx buffer)\n"
 185              "  -p            Send data (e.g. \"1234\\xde\\xad\")\n"
 186              "  -N --no-cs    no chip select\n"
 187              "  -R --ready    slave pulls low to pause\n"
 188              "  -2 --dual     dual transfer\n"
 189              "  -4 --quad     quad transfer\n"
 190              "  -S --size     transfer size\n"
 191              "  -I --iter     iterations\n");
 192         exit(1);
 193 }
 194
 195 static void parse_opts(int argc, char *argv[])
 196 {
 197         while (1) {
 198                 static const struct option lopts[] = {
 199                         { "device",  1, 0, 'D' },
 200                         { "speed",   1, 0, 's' },
 201                         { "delay",   1, 0, 'd' },
 202                         { "bpw",     1, 0, 'b' },
 203                         { "input",   1, 0, 'i' },
 204                         { "output",  1, 0, 'o' },
 205                         { "loop",    0, 0, 'l' },
 206                         { "cpha",    0, 0, 'H' },
 207                         { "cpol",    0, 0, 'O' },
 208                         { "lsb",     0, 0, 'L' },
 209                         { "cs-high", 0, 0, 'C' },
 210                         { "3wire",   0, 0, '3' },
 211                         { "no-cs",   0, 0, 'N' },
 212                         { "ready",   0, 0, 'R' },
 213                         { "dual",    0, 0, '2' },
 214                         { "verbose", 0, 0, 'v' },
 215                         { "quad",    0, 0, '4' },
 216                         { "size",    1, 0, 'S' },
 217                         { "iter",    1, 0, 'I' },
 218                         { NULL, 0, 0, 0 },
 219                 };
 220                 int c;
 221
 222                 c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:vS:I:",
 223                                 lopts, NULL);
 224
 225                 if (c == -1)
 226                         break;
 227
 228                 switch (c) {
 229                 case 'D':
 230                         device = optarg;
 231                         break;
 232                 case 's':
 233                         speed = atoi(optarg);
 234                         break;
 235                 case 'd':
 236                         delay = atoi(optarg);
 237                         break;
 238                 case 'b':
 239                         bits = atoi(optarg);
 240                         break;
 241                 case 'i':
 242                         input_file = optarg;
 243                         break;
 244                 case 'o':
 245                         output_file = optarg;
 246                         break;
 247                 case 'l':
 248                         mode |= SPI_LOOP;
 249                         break;
 250                 case 'H':
 251                         mode |= SPI_CPHA;
 252                         break;
 253                 case 'O':
 254                         mode |= SPI_CPOL;
 255                         break;
 256                 case 'L':
 257                         mode |= SPI_LSB_FIRST;
 258                         break;
 259                 case 'C':
 260                         mode |= SPI_CS_HIGH;
 261                         break;
 262                 case '3':
 263                         mode |= SPI_3WIRE;
 264                         break;
 265                 case 'N':
 266                         mode |= SPI_NO_CS;
 267                         break;
 268                 case 'v':
 269                         verbose = 1;
 270                         break;
 271                 case 'R':
 272                         mode |= SPI_READY;
 273                         break;
 274                 case 'p':
 275                         input_tx = optarg;
 276                         break;
 277                 case '2':
 278                         mode |= SPI_TX_DUAL;
 279                         break;
 280                 case '4':
 281                         mode |= SPI_TX_QUAD;
 282                         break;
 283                 case 'S':
 284                         transfer_size = atoi(optarg);
 285                         break;
 286                 case 'I':
 287                         iterations = atoi(optarg);
 288                         break;
 289                 default:
 290                         print_usage(argv[0]);
 291                 }
 292         }
 293         if (mode & SPI_LOOP) {
 294                 if (mode & SPI_TX_DUAL)
 295                         mode |= SPI_RX_DUAL;
 296                 if (mode & SPI_TX_QUAD)
 297                         mode |= SPI_RX_QUAD;
 298         }
 299 }
 300
 301 static void transfer_escaped_string(int fd, char *str)
 302 {
 303         size_t size = strlen(str);
 304         uint8_t *tx;
 305         uint8_t *rx;
 306
 307         tx = malloc(size);
 308         if (!tx)
 309                 pabort("can't allocate tx buffer");
 310
 311         rx = malloc(size);
 312         if (!rx)
 313                 pabort("can't allocate rx buffer");
 314
 315         size = unescape((char *)tx, str, size);
 316         transfer(fd, tx, rx, size);
 317         free(rx);
 318         free(tx);
 319 }
 320
 321 static void transfer_file(int fd, char *filename)
 322 {
 323         ssize_t bytes;
 324         struct stat sb;
 325         int tx_fd;
 326         uint8_t *tx;
 327         uint8_t *rx;
 328
 329         if (stat(filename, &sb) == -1)
 330                 pabort("can't stat input file");
 331
 332         tx_fd = open(filename, O_RDONLY);
 333         if (tx_fd < 0)
 334                 pabort("can't open input file");
 335
 336         tx = malloc(sb.st_size);
 337         if (!tx)
 338                 pabort("can't allocate tx buffer");
 339
 340         rx = malloc(sb.st_size);
 341         if (!rx)
 342                 pabort("can't allocate rx buffer");
 343
 344         bytes = read(tx_fd, tx, sb.st_size);
 345         if (bytes != sb.st_size)
 346                 pabort("failed to read input file");
 347
 348         transfer(fd, tx, rx, sb.st_size);
 349         free(rx);
 350         free(tx);
 351         close(tx_fd);
 352 }
 353
 354 static uint64_t _read_count;
 355 static uint64_t _write_count;
 356
 357 static void show_transfer_rate(void)
 358 {
 359         static uint64_t prev_read_count, prev_write_count;
 360         double rx_rate, tx_rate;
 361
 362         rx_rate = ((_read_count - prev_read_count) * 8) / (interval*1000.0);
 363         tx_rate = ((_write_count - prev_write_count) * 8) / (interval*1000.0);
 364
 365         printf("rate: tx %.1fkbps, rx %.1fkbps\n", rx_rate, tx_rate);
 366
 367         prev_read_count = _read_count;
 368         prev_write_count = _write_count;
 369 }
 370
 371 static void transfer_buf(int fd, int len)
 372 {
 373         uint8_t *tx;
 374         uint8_t *rx;
 375         int i;
 376
 377         tx = malloc(len);
 378         if (!tx)
 379                 pabort("can't allocate tx buffer");
 380         for (i = 0; i < len; i++)
 381                 tx[i] = random();
 382
 383         rx = malloc(len);
 384         if (!rx)
 385                 pabort("can't allocate rx buffer");
 386
 387         transfer(fd, tx, rx, len);
 388
 389         _write_count += len;
 390         _read_count += len;
 391
 392         if (mode & SPI_LOOP) {
 393                 if (memcmp(tx, rx, len)) {
 394                         fprintf(stderr, "transfer error !\n");
 395                         hex_dump(tx, len, 32, "TX");
 396                         hex_dump(rx, len, 32, "RX");
 397                         exit(1);
 398                 }
 399         }
 400
 401         free(rx);
 402         free(tx);
 403 }
 404
 405 int main(int argc, char *argv[])
 406 {
 407         int ret = 0;
 408         int fd;
 409
 410         parse_opts(argc, argv);
 411
 412         if (input_tx && input_file)
 413                 pabort("only one of -p and --input may be selected");
 414
 415         fd = open(device, O_RDWR);
 416         if (fd < 0)
 417                 pabort("can't open device");
 418
 419         /*
 420          * spi mode
 421          */
 422         ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
 423         if (ret == -1)
 424                 pabort("can't set spi mode");
 425
 426         ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
 427         if (ret == -1)
 428                 pabort("can't get spi mode");
 429
 430         /*
 431          * bits per word
 432          */
 433         ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
 434         if (ret == -1)
 435                 pabort("can't set bits per word");
 436
 437         ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
 438         if (ret == -1)
 439                 pabort("can't get bits per word");
 440
 441         /*
 442          * max speed hz
 443          */
 444         ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
 445         if (ret == -1)
 446                 pabort("can't set max speed hz");
 447
 448         ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
 449         if (ret == -1)
 450                 pabort("can't get max speed hz");
 451
 452         printf("spi mode: 0x%x\n", mode);
 453         printf("bits per word: %d\n", bits);
 454         printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
 455
 456         if (input_tx)
 457                 transfer_escaped_string(fd, input_tx);
 458         else if (input_file)
 459                 transfer_file(fd, input_file);
 460         else if (transfer_size) {
 461                 struct timespec last_stat;
 462
 463                 clock_gettime(CLOCK_MONOTONIC, &last_stat);
 464
 465                 while (iterations-- > 0) {
 466                         struct timespec current;
 467
 468                         transfer_buf(fd, transfer_size);
 469
 470                         clock_gettime(CLOCK_MONOTONIC, &current);
 471                         if (current.tv_sec - last_stat.tv_sec > interval) {
 472                                 show_transfer_rate();
 473                                 last_stat = current;
 474                         }
 475                 }
 476                 printf("total: tx %.1fKB, rx %.1fKB\n",
 477                        _write_count/1024.0, _read_count/1024.0);
 478         } else
 479                 transfer(fd, default_tx, default_rx, sizeof(default_tx));
 480
 481         close(fd);
 482
 483         return ret;
 484 }