2 * SPI testing utility (using spidev driver)
4 * Copyright (c) 2007 MontaVista Software, Inc.
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.
11 * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
21 #include <sys/ioctl.h>
22 #include <linux/ioctl.h>
24 #include <linux/types.h>
25 #include <linux/spi/spidev.h>
27 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
29 static void pabort(const char *s)
35 static const char *device = "/dev/spidev1.1";
37 static uint8_t bits = 8;
38 static char *input_file;
39 static char *output_file;
40 static uint32_t speed = 500000;
41 static uint16_t delay;
44 uint8_t default_tx[] = {
45 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
46 0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
47 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
48 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
49 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
53 uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
56 static void hex_dump(const void *src, size_t length, size_t line_size,
60 const unsigned char *address = src;
61 const unsigned char *line = address;
64 printf("%s | ", prefix);
65 while (length-- > 0) {
66 printf("%02X ", *address++);
67 if (!(++i % line_size) || (length == 0 && i % line_size)) {
69 while (i++ % line_size)
72 printf(" | "); /* right close */
73 while (line < address) {
75 printf("%c", (c < 33 || c == 255) ? 0x2E : c);
79 printf("%s | ", prefix);
85 * Unescape - process hexadecimal escape character
86 * converts shell input "\x23" -> 0x23
88 static int unescape(char *_dst, char *_src, size_t len)
97 if (*src == '\\' && *(src+1) == 'x') {
98 match = sscanf(src + 2, "%2x", &ch);
100 pabort("malformed input string");
103 *dst++ = (unsigned char)ch;
112 static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
116 struct spi_ioc_transfer tr = {
117 .tx_buf = (unsigned long)tx,
118 .rx_buf = (unsigned long)rx,
120 .delay_usecs = delay,
122 .bits_per_word = bits,
125 if (mode & SPI_TX_QUAD)
127 else if (mode & SPI_TX_DUAL)
129 if (mode & SPI_RX_QUAD)
131 else if (mode & SPI_RX_DUAL)
133 if (!(mode & SPI_LOOP)) {
134 if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
136 else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
140 ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
142 pabort("can't send spi message");
145 hex_dump(tx, len, 32, "TX");
148 out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
150 pabort("could not open output file");
152 ret = write(out_fd, rx, len);
154 pabort("not all bytes written to output file");
159 if (verbose || !output_file)
160 hex_dump(rx, len, 32, "RX");
163 static void print_usage(const char *prog)
165 printf("Usage: %s [-DsbdlHOLC3]\n", prog);
166 puts(" -D --device device to use (default /dev/spidev1.1)\n"
167 " -s --speed max speed (Hz)\n"
168 " -d --delay delay (usec)\n"
169 " -b --bpw bits per word\n"
170 " -i --input input data from a file (e.g. \"test.bin\")\n"
171 " -o --output output data to a file (e.g. \"results.bin\")\n"
172 " -l --loop loopback\n"
173 " -H --cpha clock phase\n"
174 " -O --cpol clock polarity\n"
175 " -L --lsb least significant bit first\n"
176 " -C --cs-high chip select active high\n"
177 " -3 --3wire SI/SO signals shared\n"
178 " -v --verbose Verbose (show tx buffer)\n"
179 " -p Send data (e.g. \"1234\\xde\\xad\")\n"
180 " -N --no-cs no chip select\n"
181 " -R --ready slave pulls low to pause\n"
182 " -2 --dual dual transfer\n"
183 " -4 --quad quad transfer\n");
187 static void parse_opts(int argc, char *argv[])
190 static const struct option lopts[] = {
191 { "device", 1, 0, 'D' },
192 { "speed", 1, 0, 's' },
193 { "delay", 1, 0, 'd' },
194 { "bpw", 1, 0, 'b' },
195 { "input", 1, 0, 'i' },
196 { "output", 1, 0, 'o' },
197 { "loop", 0, 0, 'l' },
198 { "cpha", 0, 0, 'H' },
199 { "cpol", 0, 0, 'O' },
200 { "lsb", 0, 0, 'L' },
201 { "cs-high", 0, 0, 'C' },
202 { "3wire", 0, 0, '3' },
203 { "no-cs", 0, 0, 'N' },
204 { "ready", 0, 0, 'R' },
205 { "dual", 0, 0, '2' },
206 { "verbose", 0, 0, 'v' },
207 { "quad", 0, 0, '4' },
212 c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:v",
223 speed = atoi(optarg);
226 delay = atoi(optarg);
235 output_file = optarg;
247 mode |= SPI_LSB_FIRST;
274 print_usage(argv[0]);
278 if (mode & SPI_LOOP) {
279 if (mode & SPI_TX_DUAL)
281 if (mode & SPI_TX_QUAD)
286 static void transfer_escaped_string(int fd, char *str)
288 size_t size = strlen(str);
294 pabort("can't allocate tx buffer");
298 pabort("can't allocate rx buffer");
300 size = unescape((char *)tx, str, size);
301 transfer(fd, tx, rx, size);
306 static void transfer_file(int fd, char *filename)
314 if (stat(filename, &sb) == -1)
315 pabort("can't stat input file");
317 tx_fd = open(filename, O_RDONLY);
319 pabort("can't open input file");
321 tx = malloc(sb.st_size);
323 pabort("can't allocate tx buffer");
325 rx = malloc(sb.st_size);
327 pabort("can't allocate rx buffer");
329 bytes = read(tx_fd, tx, sb.st_size);
330 if (bytes != sb.st_size)
331 pabort("failed to read input file");
333 transfer(fd, tx, rx, sb.st_size);
339 int main(int argc, char *argv[])
344 parse_opts(argc, argv);
346 fd = open(device, O_RDWR);
348 pabort("can't open device");
353 ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
355 pabort("can't set spi mode");
357 ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
359 pabort("can't get spi mode");
364 ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
366 pabort("can't set bits per word");
368 ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
370 pabort("can't get bits per word");
375 ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
377 pabort("can't set max speed hz");
379 ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
381 pabort("can't get max speed hz");
383 printf("spi mode: 0x%x\n", mode);
384 printf("bits per word: %d\n", bits);
385 printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
387 if (input_tx && input_file)
388 pabort("only one of -p and --input may be selected");
391 transfer_escaped_string(fd, input_tx);
393 transfer_file(fd, input_file);
395 transfer(fd, default_tx, default_rx, sizeof(default_tx));