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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
30static void pabort(const char *s)
31{
32 perror(s);
33 abort();
34}
35
36static const char *device = "/dev/spidev1.1";
37static uint32_t mode;
38static uint8_t bits = 8;
39static char *input_file;
40static char *output_file;
41static uint32_t speed = 500000;
42static uint16_t delay;
43static int verbose;
44static int transfer_size;
45static int iterations;
46static int interval = 5;
47
48uint8_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
57uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
58char *input_tx;
59
60static 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 < 33 || c == 255) ? 0x2E : c);
80 }
81 printf("\n");
82 if (length > 0)
83 printf("%s | ", prefix);
84 }
85 }
86}
87
88
89
90
91
92static 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
116static 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
167static 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
193static 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
300static 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
320static 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
353static uint64_t _read_count;
354static uint64_t _write_count;
355
356static 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
370static 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
404int 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
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
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
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, ¤t);
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
