PCF8563 driver (C language version)

#include 〈reg52.h>

#include 

#include 

#define uchar unsigned char

#define uint unsigned int

uchar TAB_T[]={ 0x31,0x06,0x10,//seconds, minutes, hours

0x13,0x01,0x07,0x08}; //Day, week, month, year.

sbit SDA=P2^6; //data

sbit SCL=P2^7; //clock

void Delay5us(void)

{

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

}

void Start(void)

{

SDA=1;

SCL=1;

Delay5us();

SDA=0;

Delay5us();

}

void Stop(void)

{

SDA=0;

SCL=1;

Delay5us();

SDA=1;

Delay5us();

 }

void Reack(void)

{

fly i=0;

SCL=1; //Ready to detect SDA Delay5us();

while((SDA==1)&&(i<100))i++; //SDA=0 is a response signal, SDA=1 is a non-response signal

SCL=0; //Prepare for the next change data

}

void WriteByte(volatile ucByte)

{

flying i;

SCL=0;

for(i=0;i<8;i++)

{

SDA=(bit)(ucByte&0x80); //Write high bit first

SCL=1;

Delay5us();

SCL=0;

ucByte<<=1;

}

SDA=1; //Release data line

}

fly ReadByte(void)

{

float i,ucByte;

SCL=0;

for(i=0;i<8;i++)

{

ucByte<<=1;

if(SDA)

ucByte++;

SCL=1;

Delay5us();

SCL=0;

}

return ucByte;

}

void Write8563(fly ucAddr,fly ucData)

{

Start();

WriteByte(0xa2);

Reack();

WriteByte(ucAddr);

Reack();

WriteByte(ucData);

Reack();

Stop();

}

fly Read8563(fly ucAddr)

{

void ucData;

Start();

WriteByte(0xa2); //Write device address

Reack();

WriteByte(ucAddr); //write byte address

Reack();

Start();

WriteByte(0xa3); //Write device address, the lowest value is 1 for read

Reack();

ucData=ReadByte(); //Write byte address

Stop();

return ucData; //read data

}

void Init8563(void)

{

fly i,ucAddr=0x02;

Write8563(0x00,0x00);

Write8563(0x01,0x11);

for(i=0;i<7;i++)

{

Write8563(ucAddr,TAB_T[i]);

ucAddr++;

}

}

void GetTime(void)

{

float i,ucData1,ucData2,ucAddr=0x02;

uchar *pTime=TAB_T;

for(i=0;i<7;i++)

{

 pTime[i]=Read8563(ucAddr);

ucAddr++;

}

pTime[0]&=0x7f; //shield invalid bits

pTime[1]&=0x7f;

pTime[2]&=0x3f;

pTime[3]&=0x3f;

pTime[4]&=0x07;

pTime[5]&=0x1f;

for(i=0;i<7;i++)

{

ucData1=pTime[i]/16; //Convert BCD code to hexadecimal

ucData2=pTime[i]%16;

pTime[i]=ucData1*10+ucData2;

}

}