8583.c

时钟芯片PCF8583的应用

#include<reg51.h>
#include<intrins.h>
#include"lcdapi.h"
#define nop4() _nop_();_nop_();_nop_();_nop_();  
#define nop5() _nop_();_nop_();_nop_();_nop_();_nop_();
#define rAdd 0xa1
#define wAdd 0xa0

typedef unsigned char uchar;
sbit VSCL = P3^6;
sbit VSDA = P3^7;
uchar bdata rechar;
sbit  one = rechar^0;

void AckIIC()
{
	VSDA = 0;
	VSCL = 1;
	nop4();
	VSCL = 0;
	VSDA = 1;
}

void StartIIC()
{
	VSDA = 1;//hi
	VSCL = 1;
	nop4();
	VSDA = 0;//low
	nop4();
	VSCL = 0;
}

void StopIIC()
{
	VSDA = 0;
	VSCL = 1;
	nop4();
	VSDA = 1;
	nop5();
	VSDA = 0;
	VSCL = 0;
}

bit CheckAckIIC()
{
	bit flag;//有效为真
	VSDA = 1;//prepare to read 
	VSCL = 1;//
	flag = ~VSDA;//low ia avalible
	VSCL = 0;
	return flag;
	
}

void SendByteIIC(char schar)
{
	unsigned char data i;
	for(i = 8;i!=0;--i)
	{
		schar = schar<<1;
		VSDA = CY;
		VSCL = 1;
		nop4();
		VSCL = 0;
		VSDA = 0;
	}
}

void WriteByteEE(uchar addr,uchar wChar)
{
	StartIIC();
	SendByteIIC(wAdd);
	CheckAckIIC();
	SendByteIIC(addr);
	CheckAckIIC();
	SendByteIIC(wChar);
	CheckAckIIC();
	StopIIC();
}

void ReadByteIIC(uchar data * rchar)
{
	uchar i;
	for(i = 8; i ;i --)
	{
		rechar =  rechar<<1;
		VSDA = 1;
		VSCL = 1;    //make the data useful
        _nop_();
        _nop_();
		one = VSDA; 
        VSCL = 0;
	}
    *rchar = rechar;
}

void ReadByteEE(uchar addr,uchar data * rchar)
{
	StartIIC();
	SendByteIIC(wAdd);
	CheckAckIIC();
	SendByteIIC(addr);
	CheckAckIIC();
	StartIIC();
	SendByteIIC(rAdd);
	CheckAckIIC();
	ReadByteIIC(rchar);
	StopIIC();
}

void main(){
    uchar rchar;
	uchar data time[16]= "时时分分秒秒    ";
	init_lcd();
    
    WriteByteEE(4,0x00);
    WriteByteEE(3,0x00);
    WriteByteEE(2,0x00);
    
	while(1)
	{
	    ReadByteEE(4,&rchar);
	    time[2] = ((rchar >> 4) & 0x03) + 0x30;
	    time[3] = (rchar & 0x0F) + 0x30;
	    
		ReadByteEE(3,&rchar);
		time[6] = (rchar >> 4) + 0x30;
		time[7] = (rchar & 0x0F) + 0x30;
		
		ReadByteEE(2,&rchar);
		time[10] = (rchar >> 4) + 0x30;
		time[11] = (rchar & 0x0F) + 0x30;
		
		DisLineCN(0x80,time);
	}
    
}