ads7842_test.c

对应之前上传的ads的测试程序

/*****************************************************************************
;Institue of Automation, Chinese Academy of Sciences
;www.hyesco.com
;Description:   ADC driver on Linux for H9200F 
;Date:          2006-7-10	
;Author:	
;E_mail:        [e-mail]		
*****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>

static int fd=-1;

int main()
{
  float value;
  unsigned int result,CHA;
		
		
  //打开设备文件；
  if((fd=open("/dev/ADS7842",O_WRONLY))==-1)
    {
    perror("open ADC error");
    exit(1);
    }
			
  //获取转换结果，并转换为电压伏数；
  for(CHA=0;CHA<=15;CHA++)
    {
    result = write(fd,&CHA,sizeof(unsigned int));
    value = (((float) result)/4096)*10.0;
    printf("CH %d = %f v\r\n",CHA,value);
    }	
  close(fd);
  return 0;
}