testadc.c

s3c2410平台下ADC数模转换驱动的源码

#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

main()
{
	int retval;
	int fd;
	int ts, maxfd;
	int  ret= 0,i;
	unsigned long number;
	unsigned int volt;

	fd = open("/dev/myadc",0);
	if (fd<0)
	{
		printf("open device adctest errr!\n");
		return 0;
	}
	for(i=0;i<100;i++)
	{
		read(fd,&number,sizeof(number));
		volt=(3300*(float)number);
		volt=volt/1023;
 		printf("vin's voltage is:%d mV\n",volt);
   		//printf("adcval=%f\n",(float)number*3300/1023);
		sleep(2);
	}   
	close(fd);
	return 0;

}