//========================================
//功能控制子程序
//實(shí)現(xiàn)對(duì)DS18S20的常用操作
//Design by ZM
//2007/1/8
//========================================

#include "SPCE061A.h"
#include "DS18S20.h"
//====================================
//語(yǔ)法格式:	void DS18S20_Write_Byte(unsigned int Data)
//實(shí)現(xiàn)功能:	DS1820字節(jié)寫入程序
//參數(shù):		Data->要寫入的字節(jié)
//返回值:	無(wú)
//=====================================
extern void DS18S20_Write_Byte(unsigned int Data)
{
	unsigned int i;
	for (i=0;i<8;i++)
	{
		if(Data&0x01)
			F_18S20_Write_1();
		else
			F_18S20_Write_0();
		Data=Data>>1;
	}
}

//============================================
//語(yǔ)法格式:	unsigned int DS18S20_Read_Byte(void)
//實(shí)現(xiàn)功能:	讀出DS18S20的一個(gè)字節(jié)內(nèi)容
//參數(shù):	無(wú)
//返回值:	字節(jié)內(nèi)容,低8位有效
//=============================================			
extern unsigned int DS18S20_Read_Byte(void)
{
	unsigned int i,Data;
	for(i=0;i<8;i++)
	{
		Data=Data>>1;
		Data=Data|F_18S20_Read();
	}
		return Data;
}

//==============================================
//語(yǔ)法格式:	unisigned int DS18S20_Initial(void)
//實(shí)現(xiàn)功能:對(duì)DS18S20的初始化，包括對(duì)端口的初始化
//								以及一次復(fù)位
//參數(shù):		無(wú)
//返回值:	成功->1;失敗->0
//===============================================
extern unsigned int DS18S20_Initial(void)
{
	unsigned int i;
//	F_18S20_SetSystemCLK();		//49Mhz
	F_18S20_Initial_IO();		//IO初始化
	i=F_18S20_Reset();			//對(duì)DS18S20復(fù)位
	return(i);
}

//=================================================
//語(yǔ)法格式:	float DS18S20_Convert_Temp(void)
//實(shí)現(xiàn)功能:	實(shí)現(xiàn)一次溫度轉(zhuǎn)換,并把結(jié)果以實(shí)型數(shù)據(jù)返回
//參數(shù):		無(wú)
//返回值:	溫度值
//==================================================
extern unsigned int DS18S20_Convert_Temp(void)
{
	unsigned int i,Data[9];
	//float temp;
//	F_18S20_SetSystemCLK();			//CPU時(shí)鐘設(shè)置為49Mhz
	if(F_18S20_Reset())
	{
		DS18S20_Write_Byte(0xcc);	//跳過(guò)ROM檢查
		DS18S20_Write_Byte(0x44);	//啟動(dòng)一次轉(zhuǎn)換
		while(F_18S20_Read()==0x80)
		{
			*P_Watchdog_Clear=0x0001;
		}
		F_18S20_Reset();
		DS18S20_Write_Byte(0xcc);       //Skip ROM
        DS18S20_Write_Byte(0xbe);       //Read Scratchpad
		for(i=0;i<9;i++)			//讀取連續(xù)9個(gè)字節(jié)的內(nèi)容
		{
			Data[i]=DS18S20_Read_Byte();
		}
		F_18S20_Reset();
		i=(Data[1]<<8)|Data[0];		//Data[0]->溫度低8位,Data[1]->溫度高8位
		//temp=(float)i;
		//temp=temp/2;				//轉(zhuǎn)換后的溫度值
	}
//	F_18S20_RsuSystemCLK();			//系統(tǒng)時(shí)鐘恢復(fù)
	return i;
}