1 // SPDX-License-Identifier: GPL-2.0-only
3 * SPI testing utility (using spidev driver)
5 * Copyright (c) 2007 MontaVista Software, Inc.
8 * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
20 #include <sys/ioctl.h>
21 #include <linux/ioctl.h>
23 #include <linux/types.h>
24 #include <linux/spi/spidev.h>
26 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
28 static void pabort(const char *s)
38 static const char *device = "/dev/spidev1.1";
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 uint16_t word_delay;
47 static int transfer_size;
48 static int iterations;
49 static int interval = 5; /* interval in seconds for showing transfer rate */
51 static uint8_t default_tx[] = {
52 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
53 0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
54 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
55 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
56 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
60 static uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
61 static char *input_tx;
63 static void hex_dump(const void *src, size_t length, size_t line_size,
67 const unsigned char *address = src;
68 const unsigned char *line = address;
71 printf("%s | ", prefix);
72 while (length-- > 0) {
73 printf("%02X ", *address++);
74 if (!(++i % line_size) || (length == 0 && i % line_size)) {
76 while (i++ % line_size)
80 while (line < address) {
82 printf("%c", (c < 32 || c > 126) ? '.' : c);
86 printf("%s | ", prefix);
92 * Unescape - process hexadecimal escape character
93 * converts shell input "\x23" -> 0x23
95 static int unescape(char *_dst, char *_src, size_t len)
104 if (*src == '\\' && *(src+1) == 'x') {
105 match = sscanf(src + 2, "%2x", &ch);
107 pabort("malformed input string");
110 *dst++ = (unsigned char)ch;
119 static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
123 struct spi_ioc_transfer tr = {
124 .tx_buf = (unsigned long)tx,
125 .rx_buf = (unsigned long)rx,
127 .delay_usecs = delay,
128 .word_delay_usecs = word_delay,
130 .bits_per_word = bits,
133 if (mode & SPI_TX_OCTAL)
135 else if (mode & SPI_TX_QUAD)
137 else if (mode & SPI_TX_DUAL)
139 if (mode & SPI_RX_OCTAL)
141 else if (mode & SPI_RX_QUAD)
143 else if (mode & SPI_RX_DUAL)
145 if (!(mode & SPI_LOOP)) {
146 if (mode & (SPI_TX_OCTAL | SPI_TX_QUAD | SPI_TX_DUAL))
148 else if (mode & (SPI_RX_OCTAL | SPI_RX_QUAD | SPI_RX_DUAL))
152 ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
154 pabort("can't send spi message");
157 hex_dump(tx, len, 32, "TX");
160 out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
162 pabort("could not open output file");
164 ret = write(out_fd, rx, len);
166 pabort("not all bytes written to output file");
172 hex_dump(rx, len, 32, "RX");
175 static void print_usage(const char *prog)
177 printf("Usage: %s [-2348CDFHILMNORSZbdilopsvw]\n", prog);
178 puts("general device settings:\n"
179 " -D --device device to use (default /dev/spidev1.1)\n"
180 " -s --speed max speed (Hz)\n"
181 " -d --delay delay (usec)\n"
182 " -w --word-delay word delay (usec)\n"
183 " -l --loop loopback\n"
185 " -H --cpha clock phase\n"
186 " -O --cpol clock polarity\n"
187 " -F --rx-cpha-flip flip CPHA on Rx only xfer\n"
188 "number of wires for transmission:\n"
189 " -2 --dual dual transfer\n"
190 " -4 --quad quad transfer\n"
191 " -8 --octal octal transfer\n"
192 " -3 --3wire SI/SO signals shared\n"
193 " -Z --3wire-hiz high impedance turnaround\n"
195 " -i --input input data from a file (e.g. \"test.bin\")\n"
196 " -o --output output data to a file (e.g. \"results.bin\")\n"
197 " -p Send data (e.g. \"1234\\xde\\xad\")\n"
198 " -S --size transfer size\n"
199 " -I --iter iterations\n"
200 "additional parameters:\n"
201 " -b --bpw bits per word\n"
202 " -L --lsb least significant bit first\n"
203 " -C --cs-high chip select active high\n"
204 " -N --no-cs no chip select\n"
205 " -R --ready slave pulls low to pause\n"
206 " -M --mosi-idle-low leave mosi line low when idle\n"
208 " -v --verbose Verbose (show tx buffer)\n");
212 static void parse_opts(int argc, char *argv[])
215 static const struct option lopts[] = {
216 { "device", 1, 0, 'D' },
217 { "speed", 1, 0, 's' },
218 { "delay", 1, 0, 'd' },
219 { "word-delay", 1, 0, 'w' },
220 { "loop", 0, 0, 'l' },
221 { "cpha", 0, 0, 'H' },
222 { "cpol", 0, 0, 'O' },
223 { "rx-cpha-flip", 0, 0, 'F' },
224 { "dual", 0, 0, '2' },
225 { "quad", 0, 0, '4' },
226 { "octal", 0, 0, '8' },
227 { "3wire", 0, 0, '3' },
228 { "3wire-hiz", 0, 0, 'Z' },
229 { "input", 1, 0, 'i' },
230 { "output", 1, 0, 'o' },
231 { "size", 1, 0, 'S' },
232 { "iter", 1, 0, 'I' },
233 { "bpw", 1, 0, 'b' },
234 { "lsb", 0, 0, 'L' },
235 { "cs-high", 0, 0, 'C' },
236 { "no-cs", 0, 0, 'N' },
237 { "ready", 0, 0, 'R' },
238 { "mosi-idle-low", 0, 0, 'M' },
239 { "verbose", 0, 0, 'v' },
244 c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lHOLC3ZFMNR248p:vS:I:",
255 speed = atoi(optarg);
258 delay = atoi(optarg);
261 word_delay = atoi(optarg);
270 output_file = optarg;
282 mode |= SPI_LSB_FIRST;
291 mode |= SPI_3WIRE_HIZ;
294 mode |= SPI_RX_CPHA_FLIP;
297 mode |= SPI_MOSI_IDLE_LOW;
318 mode |= SPI_TX_OCTAL;
321 transfer_size = atoi(optarg);
324 iterations = atoi(optarg);
327 print_usage(argv[0]);
330 if (mode & SPI_LOOP) {
331 if (mode & SPI_TX_DUAL)
333 if (mode & SPI_TX_QUAD)
335 if (mode & SPI_TX_OCTAL)
336 mode |= SPI_RX_OCTAL;
340 static void transfer_escaped_string(int fd, char *str)
342 size_t size = strlen(str);
348 pabort("can't allocate tx buffer");
352 pabort("can't allocate rx buffer");
354 size = unescape((char *)tx, str, size);
355 transfer(fd, tx, rx, size);
360 static void transfer_file(int fd, char *filename)
368 if (stat(filename, &sb) == -1)
369 pabort("can't stat input file");
371 tx_fd = open(filename, O_RDONLY);
373 pabort("can't open input file");
375 tx = malloc(sb.st_size);
377 pabort("can't allocate tx buffer");
379 rx = malloc(sb.st_size);
381 pabort("can't allocate rx buffer");
383 bytes = read(tx_fd, tx, sb.st_size);
384 if (bytes != sb.st_size)
385 pabort("failed to read input file");
387 transfer(fd, tx, rx, sb.st_size);
393 static uint64_t _read_count;
394 static uint64_t _write_count;
396 static void show_transfer_rate(void)
398 static uint64_t prev_read_count, prev_write_count;
399 double rx_rate, tx_rate;
401 rx_rate = ((_read_count - prev_read_count) * 8) / (interval*1000.0);
402 tx_rate = ((_write_count - prev_write_count) * 8) / (interval*1000.0);
404 printf("rate: tx %.1fkbps, rx %.1fkbps\n", rx_rate, tx_rate);
406 prev_read_count = _read_count;
407 prev_write_count = _write_count;
410 static void transfer_buf(int fd, int len)
418 pabort("can't allocate tx buffer");
419 for (i = 0; i < len; i++)
424 pabort("can't allocate rx buffer");
426 transfer(fd, tx, rx, len);
431 if (mode & SPI_LOOP) {
432 if (memcmp(tx, rx, len)) {
433 fprintf(stderr, "transfer error !\n");
434 hex_dump(tx, len, 32, "TX");
435 hex_dump(rx, len, 32, "RX");
444 int main(int argc, char *argv[])
450 parse_opts(argc, argv);
452 if (input_tx && input_file)
453 pabort("only one of -p and --input may be selected");
455 fd = open(device, O_RDWR);
457 pabort("can't open device");
462 /* WR is make a request to assign 'mode' */
464 ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
466 pabort("can't set spi mode");
468 /* RD is read what mode the device actually is in */
469 ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
471 pabort("can't get spi mode");
472 /* Drivers can reject some mode bits without returning an error.
473 * Read the current value to identify what mode it is in, and if it
474 * differs from the requested mode, warn the user.
477 printf("WARNING device does not support requested mode 0x%x\n",
483 ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
485 pabort("can't set bits per word");
487 ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
489 pabort("can't get bits per word");
494 ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
496 pabort("can't set max speed hz");
498 ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
500 pabort("can't get max speed hz");
502 printf("spi mode: 0x%x\n", mode);
503 printf("bits per word: %u\n", bits);
504 printf("max speed: %u Hz (%u kHz)\n", speed, speed/1000);
507 transfer_escaped_string(fd, input_tx);
509 transfer_file(fd, input_file);
510 else if (transfer_size) {
511 struct timespec last_stat;
513 clock_gettime(CLOCK_MONOTONIC, &last_stat);
515 while (iterations-- > 0) {
516 struct timespec current;
518 transfer_buf(fd, transfer_size);
520 clock_gettime(CLOCK_MONOTONIC, ¤t);
521 if (current.tv_sec - last_stat.tv_sec > interval) {
522 show_transfer_rate();
526 printf("total: tx %.1fKB, rx %.1fKB\n",
527 _write_count/1024.0, _read_count/1024.0);
529 transfer(fd, default_tx, default_rx, sizeof(default_tx));