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Linux/tools/spi/spidev_test.c

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  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(" |");
 77                         while (line < address) {
 78                                 c = *line++;
 79                                 printf("%c", (c < 32 || c > 126) ? '.' : 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 }
484 

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