ad574.c

51单片机用c语言实例 包括ad

#include "absacc.h"

//#define AD574_0		(*(unsigned char volatile xdata *)0x7F00)
//#define AD574_1		(*(unsigned char volatile xdata *)0x7F01)
#define AD574_0		XBYTE[0x7F00]
#define AD574_1		XBYTE[0x7F01]

void delay1()
{
	unsigned int i;
	for(i=0; i<0x1000; i++);
}

void main(void)
{
	unsigned int advalue;
	unsigned char Hbyte, Lbyte;

	while(1)
	{
		advalue = 0x0000;
		AD574_0 = 0;		// 启动AD采样
		delay1();
		Hbyte = AD574_0;	// 读取AD转换结果的高8位
		Lbyte = AD574_1;	// 读取AD转换结果的低8位
		advalue = (((unsigned int)Hbyte)<<4)|((Lbyte&0xf0)>>4);		// 转换结果
		delay1();
	}
}