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 init8583()
{
    uchar i;
    for(i = 0;i < 16; i ++)
    {
        WriteByteEE(i,0x00);
    }    
}
void main(){
    uchar rchar;
    init8583();
    init_lcd();
    WriteByteEE(0,0x80);
    WriteByteEE(8,0xCA); //闹钟计时器
    WriteByteEE(7,0x00);
    WriteByteEE(0x0F,0x05);
    WriteByteEE(0,0x04);
    
    while(1)
    {
       ReadByteEE(7,&rchar);
       DisChar(0x80,(rchar >> 4) + 0x30); 
       DisChar(0x81,(rchar & 0x0F) + 0x30);
       ReadByteEE(0x0F,&rchar);
       DisChar(0x82,(rchar >> 4) + 0x30); 
       DisChar(0x83,(rchar & 0x0F) + 0x30); 
    }
    while(1);
}