?? adc_test.c
字號:
/*****************************************************************************
;Institue of Automation, Chinese Academy of Sciences
;www.hyesco.com
;Description: ADC driver on Linux for XKMHK
;Date: 2006-5-27
;Author:
;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;
//輸入通道號(0~3):
location:
printf("please input the channel number(0~3): ");
scanf("%d",&CHA);
if((CHA < 0)||(CHA > 3))
{
printf("Channel number error!\r\n");
goto location;
}
//打開設備文件;
if((fd=open("/dev/adc0",O_WRONLY))==-1)
{
perror("open ADC error");
exit(1);
}
//獲取轉換結果,并轉換為電壓伏數;
result = write(fd,&CHA,sizeof(unsigned int));
value = (((float) result)/4095)*5.0;
printf("Value=%f v\r\n",value);
close(fd);
return 0;
}
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