51单片机 PCF8574驱动程序，IO口驱动程序

PCF的C程序

#include"PCF8974.h"
#include"intrins.h"

#define Write 0x40
#define Read  0x41


unsigned char dat[]={0};

void IIC_Start(void)
{
    CLK = 1;
    SDA = 1;
    CLK = 0;
    SDA = 0;
}

void IIC_Stop(void)
{
    CLK = 0;
    SDA = 0;
    CLK = 1;
    SDA = 1;
}

void IIC_Ack(void)
{
    CLK = 0;
    while(SDA);
    CLK = 1;
}

void IIC_Write(unsigned char addr)
{    
    unsigned char i;
    for(i=0;i<8;i++)
    {
        CLK = 0;

        SDA = addr&0x01;
        addr<<=1;
        CLK = 1;    
    }
}

void IIC_Read(unsigned char addr)
{    
    unsigned char i;
    for(i=0;i<8;i++)
    {
        CLK = 0;
        _nop_();
        _nop_();
        SDA = addr&0x01;
        addr<<= 1;
        CLK = 1;    
    }
}

void PCF_Write(unsigned char cmd)
{
    unsigned char i;
    for(i=0;i<8;i++)
    {
        CLK = 0;
        _nop_();
        _nop_();
        SDA = cmd&0x01;
        cmd <<= 1;
        CLK = 1;
    }
}

void PCF_Read(unsigned char time)
{
    unsigned char i,t;

    for(t=0;t<time;t++)
    {
        for(i=0;i<8;i++)
        {
            CLK = 1;
            _nop_();
            _nop_();
            dat[t]= SDA&0x80;
            dat[t]>>=1;
            CLK = 0;
        }    
    }
}
void PCF_Set(unsigned char dat,unsigned char time,unsigned char Mode)
{
    if(Mode)
    {
        IIC_Start();
        IIC_Write(Write);
        IIC_Ack();
        PCF_Write(dat);
        IIC_Stop();
    }
    else
    {
        IIC_Start();
        IIC_Read(Read);
        IIC_Ack();
        PCF_Read(time);
        IIC_Stop();
    }
}

void write(unsigned char dat)
{
    unsigned char i;    
    IIC_Start();
    IIC_Write(0x40);
    IIC_Ack();
    
    for(i=0;i<8;i++)
    {
        CLK = 0;
        _nop_();
        _nop_();
        SDA = dat&0x01;
        dat <<= 1;
        CLK = 1;
    }
    IIC_Stop();
}

PCF的h文件

#ifndef __PCF8974_H__
#define __PCF8974_H__
#include"STC15W.h"
sbit CLK = P5^4;
sbit SDA = P5^5;

void PCF_Set(unsigned char dat,unsigned char time,unsigned char Mode);
void write(unsigned char dat);
#endif  

主函数

#include"STC15W.h"
#include"PCF8974.h"

#define WriteMode 1
#define ReadMode  0
unsigned char POUT[8]=
{
    0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80
};

void delay(unsigned int i)
{
    while(i--);
} 
void main()
{     
    unsigned char x;
    //PCF_Set(0x01,1,WriteMode);
    while(1)
    {
    /*    for(x=0;x<8;x++)
        {
            write(POUT[x]);
            delay(50000);
        }    */
    write(0x0f);        
    }
}

注意:国产的PCF8574数据是反的，程序我就是用国产的（本来写命令是0x40,国产的写成0x02）;

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