319 lines
6.6 KiB
C
319 lines
6.6 KiB
C
/*
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* SPI testing utility (using spidev driver)
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*
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* Copyright (c) 2007 MontaVista Software, Inc.
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* Copyright (c) 2007 Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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* Cross-compile with cross-gcc -I/path/to/cross-kernel/include
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*/
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#include <stdint.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/types.h>
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#include <linux/spi/spidev.h>
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
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static void pabort(const char *s)
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{
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perror(s);
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abort();
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}
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static const char *device = "/dev/spidev1.1";
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static uint32_t mode;
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static uint8_t bits = 8;
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static uint32_t speed = 500000;
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static uint16_t delay;
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static int verbose;
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uint8_t default_tx[] = {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xF0, 0x0D,
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};
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uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
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char *input_tx;
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static void hex_dump(const void *src, size_t length, size_t line_size, char *prefix)
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{
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int i = 0;
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const unsigned char *address = src;
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const unsigned char *line = address;
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unsigned char c;
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printf("%s | ", prefix);
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while (length-- > 0) {
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printf("%02X ", *address++);
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if (!(++i % line_size) || (length == 0 && i % line_size)) {
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if (length == 0) {
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while (i++ % line_size)
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printf("__ ");
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}
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printf(" | "); /* right close */
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while (line < address) {
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c = *line++;
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printf("%c", (c < 33 || c == 255) ? 0x2E : c);
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}
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printf("\n");
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if (length > 0)
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printf("%s | ", prefix);
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}
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}
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}
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/*
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* Unescape - process hexadecimal escape character
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* converts shell input "\x23" -> 0x23
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*/
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static int unescape(char *_dst, char *_src, size_t len)
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{
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int ret = 0;
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char *src = _src;
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char *dst = _dst;
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unsigned int ch;
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while (*src) {
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if (*src == '\\' && *(src+1) == 'x') {
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sscanf(src + 2, "%2x", &ch);
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src += 4;
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*dst++ = (unsigned char)ch;
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} else {
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*dst++ = *src++;
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}
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ret++;
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}
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return ret;
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}
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static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
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{
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int ret;
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struct spi_ioc_transfer tr = {
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.tx_buf = (unsigned long)tx,
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.rx_buf = (unsigned long)rx,
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.len = len,
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.delay_usecs = delay,
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.speed_hz = speed,
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.bits_per_word = bits,
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};
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if (mode & SPI_TX_QUAD)
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tr.tx_nbits = 4;
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else if (mode & SPI_TX_DUAL)
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tr.tx_nbits = 2;
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if (mode & SPI_RX_QUAD)
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tr.rx_nbits = 4;
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else if (mode & SPI_RX_DUAL)
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tr.rx_nbits = 2;
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if (!(mode & SPI_LOOP)) {
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if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
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tr.rx_buf = 0;
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else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
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tr.tx_buf = 0;
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}
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ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
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if (ret < 1)
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pabort("can't send spi message");
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if (verbose)
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hex_dump(tx, len, 32, "TX");
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hex_dump(rx, len, 32, "RX");
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}
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static void print_usage(const char *prog)
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{
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printf("Usage: %s [-DsbdlHOLC3]\n", prog);
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puts(" -D --device device to use (default /dev/spidev1.1)\n"
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" -s --speed max speed (Hz)\n"
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" -d --delay delay (usec)\n"
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" -b --bpw bits per word \n"
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" -l --loop loopback\n"
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" -H --cpha clock phase\n"
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" -O --cpol clock polarity\n"
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" -L --lsb least significant bit first\n"
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" -C --cs-high chip select active high\n"
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" -3 --3wire SI/SO signals shared\n"
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" -v --verbose Verbose (show tx buffer)\n"
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" -p Send data (e.g. \"1234\\xde\\xad\")\n"
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" -N --no-cs no chip select\n"
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" -R --ready slave pulls low to pause\n"
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" -2 --dual dual transfer\n"
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" -4 --quad quad transfer\n");
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exit(1);
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}
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static void parse_opts(int argc, char *argv[])
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{
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while (1) {
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static const struct option lopts[] = {
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{ "device", 1, 0, 'D' },
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{ "speed", 1, 0, 's' },
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{ "delay", 1, 0, 'd' },
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{ "bpw", 1, 0, 'b' },
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{ "loop", 0, 0, 'l' },
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{ "cpha", 0, 0, 'H' },
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{ "cpol", 0, 0, 'O' },
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{ "lsb", 0, 0, 'L' },
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{ "cs-high", 0, 0, 'C' },
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{ "3wire", 0, 0, '3' },
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{ "no-cs", 0, 0, 'N' },
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{ "ready", 0, 0, 'R' },
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{ "dual", 0, 0, '2' },
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{ "verbose", 0, 0, 'v' },
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{ "quad", 0, 0, '4' },
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{ NULL, 0, 0, 0 },
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};
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int c;
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c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts, NULL);
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if (c == -1)
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break;
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switch (c) {
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case 'D':
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device = optarg;
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break;
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case 's':
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speed = atoi(optarg);
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break;
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case 'd':
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delay = atoi(optarg);
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break;
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case 'b':
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bits = atoi(optarg);
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break;
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case 'l':
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mode |= SPI_LOOP;
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break;
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case 'H':
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mode |= SPI_CPHA;
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break;
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case 'O':
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mode |= SPI_CPOL;
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break;
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case 'L':
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mode |= SPI_LSB_FIRST;
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break;
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case 'C':
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mode |= SPI_CS_HIGH;
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break;
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case '3':
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mode |= SPI_3WIRE;
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break;
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case 'N':
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mode |= SPI_NO_CS;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'R':
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mode |= SPI_READY;
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break;
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case 'p':
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input_tx = optarg;
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break;
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case '2':
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mode |= SPI_TX_DUAL;
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break;
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case '4':
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mode |= SPI_TX_QUAD;
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break;
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default:
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print_usage(argv[0]);
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break;
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}
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}
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if (mode & SPI_LOOP) {
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if (mode & SPI_TX_DUAL)
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mode |= SPI_RX_DUAL;
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if (mode & SPI_TX_QUAD)
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mode |= SPI_RX_QUAD;
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}
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}
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int main(int argc, char *argv[])
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{
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int ret = 0;
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int fd;
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uint8_t *tx;
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uint8_t *rx;
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int size;
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parse_opts(argc, argv);
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fd = open(device, O_RDWR);
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if (fd < 0)
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pabort("can't open device");
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/*
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* spi mode
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*/
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ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
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if (ret == -1)
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pabort("can't set spi mode");
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ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
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if (ret == -1)
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pabort("can't get spi mode");
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/*
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* bits per word
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*/
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ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
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if (ret == -1)
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pabort("can't set bits per word");
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ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
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if (ret == -1)
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pabort("can't get bits per word");
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/*
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* max speed hz
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*/
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ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
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if (ret == -1)
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pabort("can't set max speed hz");
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ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
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if (ret == -1)
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pabort("can't get max speed hz");
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printf("spi mode: 0x%x\n", mode);
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printf("bits per word: %d\n", bits);
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printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
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if (input_tx) {
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size = strlen(input_tx+1);
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tx = malloc(size);
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rx = malloc(size);
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size = unescape((char *)tx, input_tx, size);
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transfer(fd, tx, rx, size);
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free(rx);
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free(tx);
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} else {
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transfer(fd, default_tx, default_rx, sizeof(default_tx));
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}
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close(fd);
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return ret;
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}
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