adc8_test.c

为优龙公司的2410开发板写的一个的AD采样驱动程序

#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
#include<errno.h>
#include<unistd.h>
#include<linux/delay.h>
#include<sys/ioctl.h>
#define DEVICE_ADC8TEST "/dev/adc8"
int main(int argc,char *argv[])
{
	int j=0;
	int fd;
	unsigned char buf[2];
	typedef union {
                unsigned int inv;
                struct {
                        unsigned char xmsb;
                        unsigned char xlsb;
                }ch;
        }xunion;
        xunion readbuf;
        unsigned int invb=0;

	fd=open(DEVICE_ADC8TEST,O_RDONLY);
	if(fd<0)
	{
		perror("can not open device adc8");
		exit(1);
	}
	ioctl(fd,0,2500000);	//adc_frequency=2.5MHz
	printf("enter adc channel number(0-7,9=exit): ");
	scanf("%d",&j);printf("j=%x\n",j);                                                                           
	while(j!=9)
	{
		ioctl(fd,1,j);
		read(fd,buf,2);
		readbuf.ch.xlsb=buf[0];
		readbuf.ch.xmsb=buf[1];
		readbuf.inv&=0x3ff;
		if(readbuf.inv!=invb)
		{
			printf("adc[%x]=%x\n",j,readbuf.inv);
			invb=readbuf.inv;
		}
		printf("enter adc channel number(0-7,9=exit): ");
		scanf("%d",&j);printf("j=%x\n",j);
	}
	close(fd);
	return 0;
}