ds2438.c

充电电池检测ic DS2438一线通信源码

#include "reg51.h"
#include <intrins.h>

#define	Ds2438 0

#define	Standard 1
#define	uint unsigned int
#define	uchar unsigned char			  

#if	(Standard)		//24M	  0.5*8=4  快速读写DQ,1.5us
/*#define	A	6/2
#define	B	64/2
#define C	60/2
#define	D	10/2
#define	E	4/2
#define F	55/2
#define G	0/2
#define	H	480/2				 
#define	I	70/2
#define J	410/2
*/
#define	A	4/2
#define	B	20		//80us
#define C	20
#define	D	5
#define	E	8/4
#define F	55/4
#define G	0/4
#define	H	130				 
#define	I	70/4
#define J	110
#else
#define	A	1
#define	B	10
#define C	9
#define	D	2
#define	E	1
#define F	8
#define G	0
#define	H	70				 
#define	I	9
#define J	52
#endif

sbit	DQ=P1^6;

void	Delay(uint a)	//8个state
{
	
	while(a)
	a--;
 

}

void WriteBit(bit Num)
{	EA=0;
	if (Num)
	{
		// Write '1' bit
		DQ=0;			// Drives DQ low
		_nop_();
		_nop_();
		_nop_();
		_nop_();
		DQ=1; 			// Releases the bus
		Delay(B);   	// Complete the time slot and 10us recovery
	}
	else
	{
		// Write '0' bit
		DQ=0; 			// Drives DQ low
		Delay(C);
		DQ=1;		 	// Releases the bus
		Delay(D);
	}
	EA=1;
}
bit	Reset(void)
{	
	bit result;
	EA=0;
	Delay(G);
	DQ=0;				 // Drives DQ low
	Delay(H);
	DQ=1; 				// Releases the bus
	Delay(I);

	result= DQ;			 // Sample for presence pulse from slave
	Delay(J); 			// Complete the reset sequence recovery
	DQ=1;
	EA=1;
	return result;			 // Return sample presence pulse result
}

/*bit ReadBit(void)
{
	bit result;

	DQ=0; 		// Drives DQ low
	Delay(A);
	//DQ=1;		// Releases the bus
	P1M1|=0x1;		
	//P1M2=0;
	Delay(E);
	result= DQ; 	// Sample the bit value from the slave
	Delay(F); 		// Complete the time slot and 10us recovery
	P1M1&=0xfe;
	DQ=1;
	return result;
}
*/
bit ReadBit(void)
{
	bit result;
	EA=0;
	DQ=0; 		// Drives DQ low
	_nop_();
	_nop_();
	_nop_(); 	
	DQ=1;		// Releases the bus
	_nop_();
	_nop_();
	_nop_();
	result= DQ; 	// Sample the bit value from the slave
	Delay(F); 		// Complete the time slot and 10us recovery
	EA=1;
	return result;
}
void WriteByte(uchar databuf)
{
	uchar	loop;
	for (loop = 0; loop < 8; loop++)
	{
		WriteBit(databuf & 0x01);
		databuf >>= 1;
	}
}

uchar ReadByte(void)
{
	uchar loop, result=0;

	for (loop = 0; loop < 8; loop++)
	{
		result >>= 1;
		if (ReadBit())
			result |= 0x80;
	}
	return result;
}
#if		Ds2438
struct Page0{
			   uchar state;
			   uchar Teml;
			   char Temh;
			   uchar Voll;
			   uchar Volh;
			   uint	 Cur;
			   uchar ThresHold;
			   uchar CrcCode;
			};
struct Page0 idata *PPage0;
struct Page1{
			   long state;
			   uchar Capacity;
			   uint	 Offset;
			   uint	 state1;
			};
struct Page1 idata *PPage1;

uchar idata page_data[9];
uint	VolValue,CurValue;
int		TemValue;
uchar ICA;


uchar ReadPage()
{
	uchar i;
	if (Reset()) 	// Reset the 1-Wire bus
		return 0; 	// Return if no devices found
	WriteByte(0xcc);
	WriteByte(0x44);
	while(!ReadBit()); 	
	Reset();
    WriteByte(0xcc);
	WriteByte(0xb4);   
	while(!ReadBit()); 	
	Reset();
	WriteByte(0xcc); // Send Skip ROM command to select single device
	WriteByte(0xb8);
	WriteByte(0);
	while(!ReadBit()); 	
	Reset();
   	WriteByte(0xcc);
	// read the page					   
	WriteByte(0xbe); 
	WriteByte(0); 
	

								// read the page data
	for (i = 0; i <9; i++)
		page_data[i] = ReadByte();
	Reset();
	PPage0=(struct Page0 idata *)page_data;
	TemValue=PPage0->Temh;	
	if(TemValue<0)
	TemValue=TemValue+1;
	VolValue=PPage0->Volh;
	VolValue=VolValue*0x100+PPage0->Voll;
	CurValue=PPage0->Cur;
	CurValue=PPage0->Cur>>8;
	CurValue=PPage0->Cur<<8|CurValue;
	CurValue=(CurValue*10000l)/1024;//电流单位ma

	Reset();
	WriteByte(0xcc); 			// Send Skip ROM command to select single device
	WriteByte(0xb8);
	WriteByte(1);
	while(!ReadBit()); 	
	Reset();
   	WriteByte(0xcc);
								// read the page					   
	WriteByte(0xbe); 
	WriteByte(1);
								// read the page data
	for (i = 0; i <9; i++)
		page_data[i] = ReadByte();
	PPage1=(struct Page1 idata *)page_data;
	ICA=PPage1->Capacity;

    /*Buf=(OldICA+ICA)/2
	Buf1=Buf-ICA;
	if(Buf1>=0)
	{
		if(Buf1>25)
		ICA=OldICA;
		else
		OldICA=ICA;
	}
	else
	{
	    if(Buf1<-25)
		ICA=OldICA;
		else
		OldICA=ICA;
	}*/
	
	if (Reset()) 				// Reset the 1-Wire bus
		return 0;
	return 1;
}
#else
struct Page0{
			   uchar Volh;
			   uchar Voll;
			   uchar Curh;
			   uchar Curl;
			   uchar ICAh;
			   uchar ICAl;
			  
			};
struct Page0 idata *PPage0;
uchar idata page_data[6];
uint	VolValue,CurValue=0;
int		TemValue;
uint ICA;


uchar ReadPage()
{
	uchar i;
	if (Reset()) 	// Reset the 1-Wire bus
		return 0; 	// Return if no devices found
	WriteByte(0xcc);
	WriteByte(0x69);
	WriteByte(0x0c);

	for (i = 0; i <6; i++)
		page_data[i] = ReadByte();
	Reset();

	PPage0=(struct Page0 idata *)page_data;

	VolValue=PPage0->Volh;
	VolValue=VolValue*0x100+PPage0->Voll;
	VolValue=(VolValue>>5)*4.88;
	CurValue=PPage0->Curh;
	CurValue=CurValue*0x100+PPage0->Curl;
	CurValue=(CurValue>>6)*5;//电流单位ma
    if(CurValue==5115)
	CurValue=0;

	ICA=PPage0->ICAh;
	ICA=ICA*0x100+PPage0->ICAl;
	ICA>>=2;

	Reset();
	if (Reset()) 				// Reset the 1-Wire bus
		return 0;
	return 1;
}	
void	ClrICA()
{
	Reset();
	WriteByte(0xcc);
	WriteByte(0x6c);
	WriteByte(0x10);
	WriteByte(0);
	WriteByte(0);
	Reset();	
 	
}
#endif

/*void WritePage()
{
  	if (Reset()) 				// Reset the 1-Wire bus
		return ; 				// Return if no devices found

	WriteByte(0xCC); 			// Send Skip ROM command to select single device

	// read the page
	WriteByte(0xb4); 
	//WriteByte(3); 
	//WriteByte(0xff);
	Reset();
}*/