ds13xx_test.c

fresscale MX21 RTC实时种编程

#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <linux/rtc.h>

int main(int argc, char *argv[])
{
	int fd;
	struct rtc_time dt;

	if(argc < 2){
		printf("usage:argc ds13xx_test [read|write]\n");
		return;
	}

	fd = open("/dev/ds1337", O_RDWR);
	if(fd < 0){
		printf("open device ds1337 error\n");
		return;
	}

	if(strncmp(argv[1], "read", 4)==0){
		printf("======read from ds1337 rtc=======\n");
		ioctl(fd, RTC_RD_TIME, &dt);
		printf("ds1307_read_datetime: year = %d\n", dt.tm_year+2000);
		printf("ds1307_read_datetime: mon  = %d\n", dt.tm_mon); 
		printf("ds1307_read_datetime: mday = %d\n", dt.tm_mday);
		printf("ds1307_read_datetime: hour = %d\n", dt.tm_hour);
		printf("ds1307_read_datetime: min  = %d\n", dt.tm_min); 
		printf("ds1307_read_datetime: sec  = %d\n", dt.tm_sec); 
	}


	if(strncmp(argv[1], "write", 5)==0){
		printf("=========set ds1337 rtc=============\n");
		memset(&dt, 0, sizeof(struct rtc_time));
		dt.tm_year = 2007-2000;
		dt.tm_mon  = 11;
		dt.tm_mday = 15;
		dt.tm_hour = 10;
		dt.tm_min  = 40;
		dt.tm_sec  = 29;
		ioctl(fd, RTC_SET_TIME, &dt);
		printf("ds1307_set_datetime: tm_year = %d\n", dt.tm_year+1970);
		printf("ds1307_set_datetime: tm_mon  = %d\n", dt.tm_mon); 
		printf("ds1307_set_datetime: tm_mday = %d\n", dt.tm_mday);
		printf("ds1307_set_datetime: tm_hour = %d\n", dt.tm_hour);
		printf("ds1307_set_datetime: tm_min  = %d\n", dt.tm_min); 
		printf("ds1307_set_datetime: tm_sec  = %d\n", dt.tm_sec); 
	}

	close(fd);
	return;
}