logvalue.c

51单片机及其C语言程序开发实例光盘资料.rar

#include<reg51.h>
#include"Config.h"
#include"IOCfg.c"
#include"TimeDLY.h"
#include"LogValue.h"

//向DAC：MAX528写16bits数据函数：MAX528_WriteWord()
void MAX528_WriteWord(INT16U temp)
{
	INT8U i;
	MDAC_SHDN = 1;
	MDAC_CS = 1;
	MDAC_CLK = 0;
	nNop(2);
	MDAC_CS = 0;
	for(i=0;i<16;i++)
	{
		MDAC_DIN = (bit)(temp&0x80);
		MDAC_CLK = 1;
		temp <<= 1;
		nNop(1);
		MDAC_CLK = 0;
		nNop(1);		
		}
	}

//设置MAX528指定通道的指定输出函数：MAX528_DACOUT()
void MAX528_DACOUT(INT8U n,INT8U temp)
{
	INT8U X;
	INT16U Y;
	switch(n)
	{
		case 0x00:  X=0x01; break;
		case 0x01:  X=0x02; break;
		case 0x02:  X=0x04; break;
		case 0x03:  X=0x08; break;
		case 0x04:  X=0x10; break;
		case 0x05:  X=0x20; break;
		case 0x06:  X=0x40; break;
		case 0x07:  X=0x80; break;
		}
	Y = (X<<8)|temp;
	MAX528_WriteWord(Y);
	}

//设置指定通道的逻辑电平函数：Set_NLogic()
void Set_NLogic(INT8U n,FP32 temp)
{
	INT8U DAC_Value;
	DAC_Value=(INT8U)((temp*255.0)/12.5);
	MAX528_DACOUT(n,DAC_Value);
	}