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simplewrite.c
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simplewrite.c
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#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <fcntl.h>
#include <string.h> //for memcpy
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
///usr/include/linux/spi/spidev.h
///home/pi/linux/include/config/spi/spidev.h
///home/pi/linux/include/config/bcm2708/spidev.h
///home/pi/linux/include/uapi/linux/spi/spidev.h
#include <byteswap.h>
#include </home/pi/lprf/lprf-driver/lprf_registers.h>
#include </home/pi/spidev/lprf_driver.c>
int main(int argc, char *argv[])
{
if (argc != 3) {
printf("wrong number of arguments! Usage: %s <0xaddress> <0xdata>\n", argv[0]);
exit(EXIT_FAILURE);
}
uint8_t addr;
uint8_t data;
sscanf(argv[2], "0x%X", &data);
sscanf(argv[1], "0x%X", &addr);
//printf("address is %s (0x%0.2X = %d)\n", argv[1], addr, addr);
//printf("data is %s (0x%0.2X = %d)\n", argv[2], data, data);
int ret = 0;
int fd;
fd = open("/dev/spidev0.0", 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);
lprf_hw.fd = fd;
write_reg(&lprf_hw, addr, data);
uint8_t regdata = read_reg(&lprf_hw, addr);
if (data != regdata)
printf("FAILED! read from 0x%0.2X returned 0x%02X instead of 0x%0.2X\n", addr, regdata, data);
close(fd);
return ret;
}