dac_test.c~

S3C2410 DAC驱动程序

#include <stdio.h>
#include <stdlib.h>	//system
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define DEVICE_DACTEST "/dev/dac" 	 //设备节点1

int main(void)
{
	int i,fd;
	fd=open(DEVICE_DACTEST,0);//打开设备
	
	printf("fd= %d\n",fd); //fd=3
	
	if ( fd < 0 )
		{
			perror( "can not open device" );
			exit( 1 );
		}
	printf( "start DAC program\n" );
 for(i=0;i<50;i++)
       { ioctl(fd,1,5*i);
        ioctl(fd,2,5*i);}

	close(fd);
	return 0;
}