#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(int argc , char* argv[])
{
int fd ;
char *adc = "/dev/adc";
char buffer[512];//字符缓冲数组
int len = 0 , r = 0;
memset(buffer,0,sizeof(buffer));//清空所有缓冲数组中的数据
if((fd = open(adc,O_RDWR|O_NOCTTY|O_NDELAY)) < 0)//打开adc设备
{
printf("open %s failed \n",adc);
exit(1);
}else{
printf("open %s success \n ",adc);
len = read(fd,buffer,10);//读取adc传送过来的数据
if(len == 0)
{
printf("return null \n");
}else{
r = atoi(buffer);
r = (int)(r*10000/4096);//传递过来的数据为浮点型 ,进行转换和去分辨率4096
printf("res value is %f \n",r);
}
}
close(fd);
return 0;
}
001- linux - 字符设备控制之ioctl --- ADC 读数据
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转载自blog.csdn.net/Stone_Xin_H_T/article/details/81437662
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