rtc_test.c

RTC开发

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



///////////////////////////////////////////////////////////////////////////
int	 main( void )
{

	int	 		fd, ret ;
	struct    rtc_time	current_time,  alarm_time, alarm;
	long			arg;
	int			data;
	int			i;

	fd = open( "/dev/rtc", O_RDWR );
	if( fd < 0) 
	{
		printf(" Can't open file /dev/rtc. \n");
		return (-1);
	}

	/*  set  the  freq as 4HZ */
	if( ioctl(fd, RTC_IRQP_SET, 4) < 0)
	{
		fprintf( stderr, "octl(RTC_IRQP_SET )" );
		close ( fd );
		exit(1);
	}

	/* Enable periodic interrupts */
	if( ioctl(fd, RTC_PIE_ON, 0) < 0)
	{
		fprintf( stderr, "octl(RTC_PIE_ON )" );
		close ( fd );
		exit(1);
	}


	for( i=0; i<10; i++ )
	{
		if( read(fd, &data, sizeof(unsigned long)) < 0 )
		{
			fprintf(stderr, " read failure! \n");
			close( fd );	
			exit( 1 );
		}
		printf("timer:------------ %d. \n", i);
	}

	/* Disable periodic interrupts */
	ioctl( fd, RTC_PIE_OFF, 0 );
	
//	close ( fd );

#if 1
	//get current time
	ret = ioctl( fd, RTC_RD_TIME, (struct rtc_time *)&current_time);
	if( ret < 0 )
		printf(" ioctl error! \n");
	
	printf(" current time: %d-%d-%d %d:%d:%d \n", current_time.tm_year + 1900,
		current_time.tm_mon+1, current_time.tm_mday, current_time.tm_hour,
		current_time.tm_min, current_time.tm_sec );

/*
	printf(" Set new time (format xxxx-xx-xx 00:00:00):  \n ");
//	scanf("%d-%d-%d %d:%d:%d \n", &current_time.tm_year, &current_time.tm_mon,
//			 &current_time.tm_mday, &current_time.tm_hour,
//			 &current_time.tm_min, &current_time.tm_sec );
//	current_time.tm_year -= 1900;	

	current_time.tm_year = 2008 - 1900;
	ret = ioctl( fd, RTC_SET_TIME, &current_time );
*/


	alarm_time.tm_year = 0;
	alarm_time.tm_mon = 0 ;
	alarm_time.tm_mday =  22;

	alarm_time.tm_min = 22;
	alarm_time.tm_hour = 14;
	alarm_time.tm_sec = 10;

	ret = ioctl( fd, RTC_ALM_SET, &alarm_time );
	if( ret == -1 )
	{
		fprintf(stderr, "ioctl RTC_ALM_SET error!");
		exit( 1 );
	}

	ret = ioctl( fd, RTC_ALM_READ, &alarm);
	if( ret == -1 )
	{
		fprintf(stderr, "ioctl RTC_ALM_READ  error!");
		exit( 1 );
	}
	
	printf(" alarm  time: %d-%d-%d %d:%d:%d \n", alarm.tm_year, alarm.tm_mon, alarm.tm_mday,
					alarm.tm_hour, alarm.tm_min,alarm.tm_sec );
	
	
	/* start the alarm on */
	ret = ioctl( fd, RTC_AIE_ON,  0 );
	if( ret == -1 )
	{
		fprintf(stderr, "ioctl RTC_ALM_SET error!");
		exit( 1 );
	}


	ret = read( fd, &data, sizeof(unsigned long) );
	if( ret == -1 )
	{
		fprintf(stderr, "read error ! \n");
		exit ( 1 );
	}
	
	printf(" Okay! Alarm rang.! -----------\n");
	
	close( fd );
#endif

	return 0;
}