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 <sys/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         perror(s);
  31         abort();
  32 }
  33
  34 static const char *device = "/dev/spidev1.1";
  35 static uint32_t mode;
  36 static uint8_t bits = 8;
  37 static char *input_file;
  38 static char *output_file;
  39 static uint32_t speed = 500000;
  40 static uint16_t delay;
  41 static int verbose;
  42
  43 uint8_t default_tx[] = {
  44         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  45         0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
  46         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  47         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  48         0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
  49         0xF0, 0x0D,
  50 };
  51
  52 uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
  53 char *input_tx;
  54
  55 static void hex_dump(const void *src, size_t length, size_t line_size,
  56                      char *prefix)
  57 {
  58         int i = 0;
  59         const unsigned char *address = src;
  60         const unsigned char *line = address;
  61         unsigned char c;
  62
  63         printf("%s | ", prefix);
  64         while (length-- > 0) {
  65                 printf("%02X ", *address++);
  66                 if (!(++i % line_size) || (length == 0 && i % line_size)) {
  67                         if (length == 0) {
  68                                 while (i++ % line_size)
  69                                         printf("__ ");
  70                         }
  71                         printf(" | ");  /* right close */
  72                         while (line < address) {
  73                                 c = *line++;
  74                                 printf("%c", (c < 33 || c == 255) ? 0x2E : c);
  75                         }
  76                         printf("\n");
  77                         if (length > 0)
  78                                 printf("%s | ", prefix);
  79                 }
  80         }
  81 }
  82
  83 /*
  84  *  Unescape - process hexadecimal escape character
  85  *      converts shell input "\x23" -> 0x23
  86  */
  87 static int unescape(char *_dst, char *_src, size_t len)
  88 {
  89         int ret = 0;
  90         int match;
  91         char *src = _src;
  92         char *dst = _dst;
  93         unsigned int ch;
  94
  95         while (*src) {
  96                 if (*src == '\\' && *(src+1) == 'x') {
  97                         match = sscanf(src + 2, "%2x", &ch);
  98                         if (!match)
  99                                 pabort("malformed input string");
 100
 101                         src += 4;
 102                         *dst++ = (unsigned char)ch;
 103                 } else {
 104                         *dst++ = *src++;
 105                 }
 106                 ret++;
 107         }
 108         return ret;
 109 }
 110
 111 static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
 112 {
 113         int ret;
 114         int out_fd;
 115         struct spi_ioc_transfer tr = {
 116                 .tx_buf = (unsigned long)tx,
 117                 .rx_buf = (unsigned long)rx,
 118                 .len = len,
 119                 .delay_usecs = delay,
 120                 .speed_hz = speed,
 121                 .bits_per_word = bits,
 122         };
 123
 124         if (mode & SPI_TX_QUAD)
 125                 tr.tx_nbits = 4;
 126         else if (mode & SPI_TX_DUAL)
 127                 tr.tx_nbits = 2;
 128         if (mode & SPI_RX_QUAD)
 129                 tr.rx_nbits = 4;
 130         else if (mode & SPI_RX_DUAL)
 131                 tr.rx_nbits = 2;
 132         if (!(mode & SPI_LOOP)) {
 133                 if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
 134                         tr.rx_buf = 0;
 135                 else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
 136                         tr.tx_buf = 0;
 137         }
 138
 139         ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
 140         if (ret < 1)
 141                 pabort("can't send spi message");
 142
 143         if (verbose)
 144                 hex_dump(tx, len, 32, "TX");
 145
 146         if (output_file) {
 147                 out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 148                 if (out_fd < 0)
 149                         pabort("could not open output file");
 150
 151                 ret = write(out_fd, rx, len);
 152                 if (ret != len)
 153                         pabort("not all bytes written to output file");
 154
 155                 close(out_fd);
 156         }
 157
 158         if (verbose || !output_file)
 159                 hex_dump(rx, len, 32, "RX");
 160 }
 161
 162 static void print_usage(const char *prog)
 163 {
 164         printf("Usage: %s [-DsbdlHOLC3]\n", prog);
 165         puts("  -D --device   device to use (default /dev/spidev1.1)\n"
 166              "  -s --speed    max speed (Hz)\n"
 167              "  -d --delay    delay (usec)\n"
 168              "  -b --bpw      bits per word\n"
 169              "  -i --input    input data from a file (e.g. \"test.bin\")\n"
 170              "  -o --output   output data to a file (e.g. \"results.bin\")\n"
 171              "  -l --loop     loopback\n"
 172              "  -H --cpha     clock phase\n"
 173              "  -O --cpol     clock polarity\n"
 174              "  -L --lsb      least significant bit first\n"
 175              "  -C --cs-high  chip select active high\n"
 176              "  -3 --3wire    SI/SO signals shared\n"
 177              "  -v --verbose  Verbose (show tx buffer)\n"
 178              "  -p            Send data (e.g. \"1234\\xde\\xad\")\n"
 179              "  -N --no-cs    no chip select\n"
 180              "  -R --ready    slave pulls low to pause\n"
 181              "  -2 --dual     dual transfer\n"
 182              "  -4 --quad     quad transfer\n");
 183         exit(1);
 184 }
 185
 186 static void parse_opts(int argc, char *argv[])
 187 {
 188         while (1) {
 189                 static const struct option lopts[] = {
 190                         { "device",  1, 0, 'D' },
 191                         { "speed",   1, 0, 's' },
 192                         { "delay",   1, 0, 'd' },
 193                         { "bpw",     1, 0, 'b' },
 194                         { "input",   1, 0, 'i' },
 195                         { "output",  1, 0, 'o' },
 196                         { "loop",    0, 0, 'l' },
 197                         { "cpha",    0, 0, 'H' },
 198                         { "cpol",    0, 0, 'O' },
 199                         { "lsb",     0, 0, 'L' },
 200                         { "cs-high", 0, 0, 'C' },
 201                         { "3wire",   0, 0, '3' },
 202                         { "no-cs",   0, 0, 'N' },
 203                         { "ready",   0, 0, 'R' },
 204                         { "dual",    0, 0, '2' },
 205                         { "verbose", 0, 0, 'v' },
 206                         { "quad",    0, 0, '4' },
 207                         { NULL, 0, 0, 0 },
 208                 };
 209                 int c;
 210
 211                 c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:v",
 212                                 lopts, NULL);
 213
 214                 if (c == -1)
 215                         break;
 216
 217                 switch (c) {
 218                 case 'D':
 219                         device = optarg;
 220                         break;
 221                 case 's':
 222                         speed = atoi(optarg);
 223                         break;
 224                 case 'd':
 225                         delay = atoi(optarg);
 226                         break;
 227                 case 'b':
 228                         bits = atoi(optarg);
 229                         break;
 230                 case 'i':
 231                         input_file = optarg;
 232                         break;
 233                 case 'o':
 234                         output_file = optarg;
 235                         break;
 236                 case 'l':
 237                         mode |= SPI_LOOP;
 238                         break;
 239                 case 'H':
 240                         mode |= SPI_CPHA;
 241                         break;
 242                 case 'O':
 243                         mode |= SPI_CPOL;
 244                         break;
 245                 case 'L':
 246                         mode |= SPI_LSB_FIRST;
 247                         break;
 248                 case 'C':
 249                         mode |= SPI_CS_HIGH;
 250                         break;
 251                 case '3':
 252                         mode |= SPI_3WIRE;
 253                         break;
 254                 case 'N':
 255                         mode |= SPI_NO_CS;
 256                         break;
 257                 case 'v':
 258                         verbose = 1;
 259                         break;
 260                 case 'R':
 261                         mode |= SPI_READY;
 262                         break;
 263                 case 'p':
 264                         input_tx = optarg;
 265                         break;
 266                 case '2':
 267                         mode |= SPI_TX_DUAL;
 268                         break;
 269                 case '4':
 270                         mode |= SPI_TX_QUAD;
 271                         break;
 272                 default:
 273                         print_usage(argv[0]);
 274                         break;
 275                 }
 276         }
 277         if (mode & SPI_LOOP) {
 278                 if (mode & SPI_TX_DUAL)
 279                         mode |= SPI_RX_DUAL;
 280                 if (mode & SPI_TX_QUAD)
 281                         mode |= SPI_RX_QUAD;
 282         }
 283 }
 284
 285 static void transfer_escaped_string(int fd, char *str)
 286 {
 287         size_t size = strlen(str + 1);
 288         uint8_t *tx;
 289         uint8_t *rx;
 290
 291         tx = malloc(size);
 292         if (!tx)
 293                 pabort("can't allocate tx buffer");
 294
 295         rx = malloc(size);
 296         if (!rx)
 297                 pabort("can't allocate rx buffer");
 298
 299         size = unescape((char *)tx, str, size);
 300         transfer(fd, tx, rx, size);
 301         free(rx);
 302         free(tx);
 303 }
 304
 305 static void transfer_file(int fd, char *filename)
 306 {
 307         ssize_t bytes;
 308         struct stat sb;
 309         int tx_fd;
 310         uint8_t *tx;
 311         uint8_t *rx;
 312
 313         if (stat(filename, &sb) == -1)
 314                 pabort("can't stat input file");
 315
 316         tx_fd = open(filename, O_RDONLY);
 317         if (fd < 0)
 318                 pabort("can't open input file");
 319
 320         tx = malloc(sb.st_size);
 321         if (!tx)
 322                 pabort("can't allocate tx buffer");
 323
 324         rx = malloc(sb.st_size);
 325         if (!rx)
 326                 pabort("can't allocate rx buffer");
 327
 328         bytes = read(tx_fd, tx, sb.st_size);
 329         if (bytes != sb.st_size)
 330                 pabort("failed to read input file");
 331
 332         transfer(fd, tx, rx, sb.st_size);
 333         free(rx);
 334         free(tx);
 335         close(tx_fd);
 336 }
 337
 338 int main(int argc, char *argv[])
 339 {
 340         int ret = 0;
 341         int fd;
 342
 343         parse_opts(argc, argv);
 344
 345         fd = open(device, O_RDWR);
 346         if (fd < 0)
 347                 pabort("can't open device");
 348
 349         /*
 350          * spi mode
 351          */
 352         ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
 353         if (ret == -1)
 354                 pabort("can't set spi mode");
 355
 356         ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
 357         if (ret == -1)
 358                 pabort("can't get spi mode");
 359
 360         /*
 361          * bits per word
 362          */
 363         ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
 364         if (ret == -1)
 365                 pabort("can't set bits per word");
 366
 367         ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
 368         if (ret == -1)
 369                 pabort("can't get bits per word");
 370
 371         /*
 372          * max speed hz
 373          */
 374         ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
 375         if (ret == -1)
 376                 pabort("can't set max speed hz");
 377
 378         ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
 379         if (ret == -1)
 380                 pabort("can't get max speed hz");
 381
 382         printf("spi mode: 0x%x\n", mode);
 383         printf("bits per word: %d\n", bits);
 384         printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
 385
 386         if (input_tx && input_file)
 387                 pabort("only one of -p and --input may be selected");
 388
 389         if (input_tx)
 390                 transfer_escaped_string(fd, input_tx);
 391         else if (input_file)
 392                 transfer_file(fd, input_file);
 393         else
 394                 transfer(fd, default_tx, default_rx, sizeof(default_tx));
 395
 396         close(fd);
 397
 398         return ret;
 399 }