单片机24C02仿真，

#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
#define WriteDeviceAddress 0xa0     //定义器件写地址
#define ReadDviceAddress 0xa1        //定义器件读地址
sbit SCL=P3^3;                    //P2.7口模拟SCL信号
sbit SDA=P3^2;                    // P2.6口模拟SDA信号
bit ACK;                           //定义应答位
unsigned char i,rebuf[16] _at_ 0x40;   //16字节的数据接收缓冲区

void DelayMs(unsigned int number)    //延时函数
{
    unsigned char temp;
    for(;number!=0;number--)
           for(temp=100;temp!=0;temp--) ;
}

void Start() /*发起始位*/
{
    SDA=1;
    SCL=1;
    SDA=0;
    SCL=0;
}

void Stop() /*发停止位*/
{
    SCL=0;
    SDA=0;
    SCL=1;
    SDA=1;
}

void YEAck() /*发应答信号*/
{
    SDA=0;
    SCL=1;
    SCL=0;
}

void NoAck() /*发非应答信号*/
{
    SDA=1;
    SCL=1;
    SCL=0;
}

bit TestAck() /*测试应答信号*/
{
        bit ErrorBit;
        SDA=1;
        SCL=1;
        ErrorBit=SDA;
        SCL=0;
        return(ErrorBit);
}

Write8Bit(unsigned char input) /*写入 8 个 bit 到 24c02 */
{
    unsigned char temp;
    for(temp=8;temp!=0;temp--)
    {
           SDA=(bit)(input&0x80);
           SCL=1;
           SCL=0;
           input=input<<1;
    }
}

uchar Read8Bit() /*从 24c02 中读出 8 个 bit*/
{
    unsigned char temp,rbyte=0;
    for(temp=8;temp!=0;temp--)
    {
           SDA=1;
           SCL=1;
           rbyte=rbyte<<1;
           rbyte=rbyte|((unsigned char)(SDA));
           SCL=0;
    }
    return(rbyte);
}

/*向24c02的address地址中写入8个字节数据ch*/
void Write24c02(uchar ch,uchar address)
{
   Start();
    Write8Bit(WriteDeviceAddress);
    ACK=TestAck();
    if (ACK==1)
           Stop();
    Write8Bit(address);
    ACK=TestAck();
    if (ACK==1)
           Stop();
    for(i=0;i<8;i++)
    {
           Write8Bit(ch);
            TestAck();
           if (ACK==1)
           Stop();
            ch++;
    }
    Stop();
    DelayMs(10);
}

/*从24c02的地址address中读取mm个字节数据*/
Read24c02_mm (uchar mm, uchar address)
{
   uchar ch;
    Start();
    Write8Bit(WriteDeviceAddress);
    ACK=TestAck();
   if (ACK==1)
           Stop();
    Write8Bit(address);
    ACK=TestAck();
   if (ACK==1)
           Stop();
    Start();
    Write8Bit(ReadDviceAddress);
   ACK=TestAck();
   if (ACK==1)
           Stop();
    for(i=0;i<mm-1;i++)
    {
           ch=Read8Bit();
           P0=ch;
           DelayMs(5000);
           YEAck();
    }
    ch=Read8Bit();
    P0=ch;
    DelayMs(5000);
    NoAck();
    Stop();
}

/*写入8个字节到 24c02 并读出来通过P0口的LED验证*/
void main(void) // 主程序
{
   uchar c1;
    while(1)
    {
            unsigned char m,n;
           m=0x01;
           n=0x30;
            Write24c02(m,n);
           Read24c02_mm(5,0x32);
           while(1);
   }
}
单片机24C02仿真，

单片机24C02仿真，

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