adc.c

来自「病理冰冻切片机C51程序,KEIL C编译环境」· C语言 代码 · 共 48 行

#include "mqb.h"

BYTE GetADCData(BYTE Chanel)/*Chanel=0x0c;0x0d;0x0e;0x0f*/
{
BYTE ch,i,ch1;
bit b;
   ADCCS=1;
   ADCCLK=0;
   ADCCS=0;
   Chanel+=0xc;
   for (i=0;i<4;i++)
   {
   	b=0x08&Chanel;
   	ADCDI=b;
	ADCCLK=1;
	ADCCLK=0;
	Chanel=Chanel<<1;
   }
   ADCDI=1;
   ADCCLK=1;
   ch=0;
   i=0x80;
   while (i)
	{
		ADCCLK=1;
		ADCDO=1;
		ADCCLK=0;
		if (ADCDO) ch=ch|i;
		i=i>>1;	
	}
   ch1=0;i=0x1;
   ADCDO=1;
   ADCCLK=1;
   if (ADCDO) ch1=ch1|i;
   i=0x2;
   while (i)
	{
		ADCCLK=1;
		ADCDO=1;
		ADCCLK=0;
		if (ADCDO) ch1=ch1|i;
		i=i<<1;	
	}
   ADCCLK=1;
   ADCCS=1;	
   if (ch==ch1) return ch;
   else return 0xff;
}