#include <io8515v.h>
#include <macros.h>
#include "d12head.h"

#define TEMPTPORT  PORTB
#define TEMPTDDR   DDRB
#define TEMPTPIN   PINB   
#define TEMPTNUM   0     //定義B0口為18b20 

/*void delay_us(int time)
{
	do{
		time--;
	}while (time>1);
}
*/
/** /
void delay_ms(long time)
{
	time=time*60;   
	do{
		WDR(); //看門(mén)狗復(fù)位	
		time--;
	}while (time>1);
}
/**/

/*********************************************
          檢查DS18B20是否存在：
	如果DS18B20不存在返回1，否則返回0
*********************************************/
/*///
unsigned char DS18B20_ack(void)
{
	unsigned char ack;
	TEMPTDDR|=1<<TEMPTNUM;        //輸出
	TEMPTPORT&=~(1<<TEMPTNUM);    //輸出LOW
	delay_us(500);//復(fù)位低電平，480us-960us
	TEMPTPORT|=1<<TEMPTNUM;       //輸出HIGH
	TEMPTDDR&=~(1<<TEMPTNUM);     //輸入
	delay_us(45);//復(fù)位預(yù)計(jì)600us
	ack=TEMPTPIN;
	ack &= 1<<TEMPTNUM;
	delay_us(500);//等待18B20的自動(dòng)上拉電阻拉高。
	return ack;
}
*////
/*********************************************
           寫(xiě)ROM或存貯器命令到DS18B20
*********************************************/
/*///
void DS18B20_write(unsigned char cmd)
{ 
	unsigned char i,j;
	TEMPTDDR |= 1<<TEMPTNUM;         //輸出
	for (j=0;j<=7;j++)//兩次數(shù)據(jù)之間的時(shí)間間隔大于1us。
	{
		i=cmd&0x01;
		if (i==0x01)//輸出1
		{
			TEMPTPORT &= ~(1<<TEMPTNUM);     //輸出LOW
			delay_us(10);//保持低電平大于1us小于15us
			TEMPTPORT |= 1<<TEMPTNUM;        //輸出HIGH
			delay_us(100);//要求持續(xù)時(shí)間大于60us,小于120us
		}
		else        //輸出0
		{
			TEMPTPORT &= ~(1<<TEMPTNUM);     //輸出LOW
			delay_us(100);
			TEMPTPORT |= 1<<TEMPTNUM;        //輸出HIGH
			delay_us(10);
         }
		 cmd=cmd>>1;
	}
}
*////
/*********************************************
          從DS18B20讀溫度數(shù)據(jù)
*********************************************/
/*///
void DS18B20_read(void)   
{
	unsigned char byteH,byteL,i;  
	unsigned int tempt=0;  
	for (i=0;i<8;i++)
	{
		TEMPTDDR  |= 1<<TEMPTNUM;       //輸出
		TEMPTPORT &= ~(1<<TEMPTNUM);    //輸出LOW
		delay_us(3);//發(fā)送0，保持大于1us以上時(shí)間。
		TEMPTPORT |= 1<<TEMPTNUM;       //輸出HIGH
		TEMPTDDR  &= ~(1<<TEMPTNUM);    //輸入
		delay_us(10);
		if (TEMPTPIN&1<<TEMPTNUM)
			byteL |= 0x80;
		if (i<7)
			byteL = byteL>>1;
		delay_us(100);
		TEMPTDDR |= 1<<TEMPTNUM;       //輸出
		delay_us(5);
	}
	for (i=0;i<8;i++)
	{
		TEMPTDDR  |= 1<<TEMPTNUM;       //輸出
		TEMPTPORT &= ~(1<<TEMPTNUM);    //輸出LOW
		delay_us(3);//發(fā)送0，保持大于1us以上時(shí)間。
		TEMPTPORT |= 1<<TEMPTNUM;       //輸出HIGH
		TEMPTDDR  &= ~(1<<TEMPTNUM);    //輸入
		delay_us(10);
		if (TEMPTPIN&1<<TEMPTNUM)
			byteH |= 0x80;
		if (i<7)
			byteH = byteH>>1;
		delay_us(100);
		TEMPTDDR |= 1<<TEMPTNUM;       //輸出
		delay_us(5);
	}
	XmtBuff.msg[0] = byteL;//返回主機(jī)有符號(hào)的shor int 數(shù)
	XmtBuff.msg[1] = byteH;//其除以16即為溫度值
	XmtBuff.msgL = 2;
}
*////
/*///
void converT_command(void)
{
	char i;
	do{
///		i=DS18B20_ack();//對(duì)DS18B20進(jìn)行復(fù)位				 	     
	} while (i == 1<<TEMPTNUM);
///	DS18B20_write(0xcc); //1100 1100 給18B20發(fā)啟動(dòng)命令
///	DS18B20_write(0x44); //0100 0100 給18B20發(fā)轉(zhuǎn)換溫度指令 
} 
*////
//delay_ms(900);//延時(shí)等轉(zhuǎn)換結(jié)束，12位格式約需750ms
/*///
void readT_command (void)
{
	char i;
	do{
///		i=DS18B20_ack();//對(duì)DS18B20進(jìn)行復(fù)位				 	     
	} while (i == 1<<TEMPTNUM);
///	DS18B20_write(0xcc);//1100 1100 給18B20發(fā)啟動(dòng)命令
///	DS18B20_write(0xbe);//1011 1110 給18B20發(fā)讀溫度指令	
///	DS18B20_read();				
}
*////
void wendu (void)
{
///	converT_command();
///	readT_command();
}