adcp.c

adc驱动测试程序for s3c44b0 uclinux。insmod 后在var目录建立一个adc0的节点才能使用程序测试驱动。

#include<stdio.h>
#include<fcntl.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/ioctl.h>
#include<unistd.h>
#include"adc.h"

int main(void)
{
 int fd = -1;
 unsigned short   adcdata = 0;
 unsigned long i;
 fd = open("/var/adc0",O_RDONLY);
 if(fd<0)
  {
   printf("\nCan't open this file!\n");
   return -1;
  }
 printf("\nopen ok!\n");
 ioctl(fd,ADC_SET_CLKDIV,0x04);
 ioctl(fd,ADC_SET_BITS,0x00<<2);
 printf("\nadc init ok\n");
 for(i = 0;i < 10; i++)
  {
   printf("\ngetting %d  adcdat\n",i);
   adcdata = 0;
   read(fd,&adcdata,1);
   printf("\nADC0:result = %d \n",adcdata); 
   sleep(1);
  }
 printf("\nclose adc!\n");
 close(fd);
 return 0;
}