Mity CPU Platforms » MitySOM-5CSX Altera Cyclone V

/*

 * SPI testing utility (using spidev driver)

 *

 * Copyright (c) 2011  Critical Link LLC

 * 

 * This code is based on the software from the following:

 *

 * Copyright (c) 2007  MontaVista Software, Inc.

 * Copyright (c) 2007  Anton Vorontsov <avorontsov@ru.mvista.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License.

 *

 * Cross-compile with cross-gcc -I/path/to/cross-kernel/include

 */

#include <sys/types.h>

#include <stdint.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <getopt.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <linux/types.h>

#include <linux/spi/spidev.h>

#include <unistd.h>

#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

static void pabort(const char *s)

{

	perror(s);

	abort();

}

static const char *device = "/dev/spidev1.1";

static uint8_t mode;

static uint8_t bits = 8;

static uint32_t numbytes = 38;

static uint32_t speed = 500000;

static uint16_t delay;

static uint8_t loopback = 0;

static uint32_t loops = 1;

static uint8_t quiet = 0;

static int transfer(int fd)

{

	int ret, i, rv = 0;

	uint8_t tx[512];

	uint8_t rx[ARRAY_SIZE(tx)];

	struct spi_ioc_transfer tr = {

		.tx_buf = (unsigned long)tx,

		.rx_buf = (unsigned long)rx,

		.len = numbytes,

		.delay_usecs = delay,

		.speed_hz = speed,

		.bits_per_word = bits,

	};

	for (i = 0; i < ARRAY_SIZE(tx); i++)

	{

		tx[i] = i&0x0FF;

		rx[i] = ~tx[i];

	}

	ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);

	if (ret == 1)

		pabort("can't send spi message");

	for (ret = 0; ret < numbytes; ret++) {

		if (loopback && (tx[ret] != rx[ret]))

		{

			rv = -1;

			break;

		}

	}

	if (!quiet || rv) 

	{

		for (ret = 0; ret < numbytes; ret++) {

			if (!(ret % 8))

				puts("");

			printf("%.2X ", rx[ret]);

		}

		puts("");

	}

	if (rv)

		printf("ERROR DETECTED IN RECEIVE STREAM\n");

	return rv;

}

static void print_usage(const char *prog)

{

	printf("Usage: %s [-DsqrbndlHOLC3]\n", prog);

	puts("  -D --device   device to use (default /dev/spidev1.1)\n"

	     "  -s --speed    max speed (Hz)\n"

	     "  -d --delay    delay (usec)\n"

	     "  -b --bpw      bits per word \n"

	     "  -l --loop     loopback\n"

	     "  -r --repeat   number of cycles to repeat\n"

	     "  -H --cpha     clock phase\n"

	     "  -O --cpol     clock polarity\n"

	     "  -L --lsb      least significant bit first\n"

	     "  -C --cs-high  chip select active high\n"

	     "  -n --numbytes number of bytes to send\n"

	     "  -q --quiet    don't display results\n"

	     "  -3 --3wire    SI/SO signals shared\n");

	exit(1);

}

static void parse_opts(int argc, char *argv[])

{

	while (1) {

		static const struct option lopts[] = {

			{ "device",  1, 0, 'D' },

			{ "speed",   1, 0, 's' },

			{ "delay",   1, 0, 'd' },

			{ "bpw",     1, 0, 'b' },

			{ "numbytes",1, 0, 'n' },

			{ "repeat",  1, 0, 'r' },

			{ "loop",    0, 0, 'l' },

			{ "cpha",    0, 0, 'H' },

			{ "cpol",    0, 0, 'O' },

			{ "lsb",     0, 0, 'L' },

			{ "cs-high", 0, 0, 'C' },

			{ "3wire",   0, 0, '3' },

			{ "no-cs",   0, 0, 'N' },

			{ "ready",   0, 0, 'R' },

			{ "quiet",   0, 0, 'q' },

			{ NULL, 0, 0, 0 },

		};

		int c;

		c = getopt_long(argc, argv, "D:s:d:b:n:r:lqHOLC3NR", lopts, NULL);

		if (c == -1)

			break;

		switch (c) {

		case 'D':

			device = optarg;

			break;

		case 's':

			speed = atoi(optarg);

			break;

		case 'd':

			delay = atoi(optarg);

			break;

		case 'b':

			bits = atoi(optarg);

			break;

		case 'r':

			loops = atoi(optarg);

			if (loops <= 0) loops = 1;

			printf("running %d loops\n", loops);

			break;

		case 'n':

			numbytes = atoi(optarg);

			if (numbytes <= 0) numbytes = 38;

			if (numbytes > 512) numbytes = 512;

			break;

		case 'l':

			mode |= SPI_LOOP;

			loopback = 1;

			break;

		case 'H':

			mode |= SPI_CPHA;

			break;

		case 'O':

			mode |= SPI_CPOL;

			break;

		case 'L':

			mode |= SPI_LSB_FIRST;

			break;

		case 'C':

			mode |= SPI_CS_HIGH;

			break;

		case '3':

			mode |= SPI_3WIRE;

			break;

		case 'N':

			mode |= SPI_NO_CS;

			break;

		case 'R':

			mode |= SPI_READY;

			break;

		case 'q':

			quiet = 1;

			break;

		default:

			print_usage(argv[0]);

			break;

		}

	}

}

int main(int argc, char *argv[])

{

	int ret = 0;

	int fd, i;

	parse_opts(argc, argv);

	fd = open(device, O_RDWR);

	if (fd < 0)

		pabort("can't open device");

	/*

	 * spi mode

	 */

	ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);

	if (ret == -1)

		pabort("can't set spi mode");

	ret = ioctl(fd, SPI_IOC_RD_MODE, &mode);

	if (ret == -1)

		pabort("can't get spi mode");

	/*

	 * bits per word

	 */

	ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);

	if (ret == -1)

		pabort("can't set bits per word");

	ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);

	if (ret == -1)

		pabort("can't get bits per word");

	/*

	 * max speed hz

	 */

	ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);

	if (ret == -1)

		pabort("can't set max speed hz");

	ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);

	if (ret == -1)

		pabort("can't get max speed hz");

	printf("spi mode: %d\n", mode);

	printf("bits per word: %d\n", bits);

	printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);

	for (i = 1; i <= loops; i++)

	{

		ret = transfer(fd);

		if (ret) {

			printf("Failed after %d cycles\n",i);

			break;

		}

		if (!(i % 10))

			printf(".");	

		if (!(i % 400))

			printf("\n");

	}

	if (!ret)

		printf("%d cycles run\n", i-1);

	close(fd);

	return ret;

}