i2c_test.c

at24c02驱动和测试程序

//i2ctest.c

#include <stdio.h>

#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>

//#include </work/utu-Linux2.6.24/include/linux/i2c-dev.h>
//#include </work/utu-Linux2.6.24/include/linux/i2c.h>

int main(void)
{
	int fd;

	char write_data[2];
	char read_data;

	fd = open("/dev/at24c02", O_RDWR);
	
	if (!fd)
	{	
		printf("Error on opening the device file\n");
		return 0;
	}

	printf("Please input addr and data!\n");
	scanf("%hd,%hd", &write_data[0], &write_data[1]);
	write(fd, &write_data, sizeof(write_data));
	printf("write-> addr = %d, data = %d\n", write_data[0], write_data[1]);
	sleep(1);
	read(fd, &read_data, write_data[0]);
	printf("read-> addr = %d, data = %d\n", write_data[0], read_data);
	close(fd);
	return 0;
}