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    sbit SCL=P1^7;/*假設(shè)由P1.7和P1.6控制*/
    sbit SDA=P1^6;

/********** Function Definition　函數(shù)定義 ************/

    void DELAY(unsigned int t) /*延時(shí)函數(shù)*/
    {
        while(t!=0)
            t--;
    }

    void I2C_Start(void)
    {
        /*啟動I2C總線的函數(shù)，當(dāng)SCL為高電平時(shí)使SDA產(chǎn)生一個(gè)負(fù)跳變*/
        SDA=1;
        SCL=1;
        DELAY(DELAY_TIME);
        SDA=0;
        DELAY(DELAY_TIME);
        SCL=0;
        DELAY(DELAY_TIME);
    }

    void I2C_Stop(void)
    {
        /*終止I2C總線，當(dāng)SCL為高電平時(shí)使SDA產(chǎn)生一個(gè)正跳變*/
        SDA=0;
        SCL=1;
        DELAY(DELAY_TIME);
        SDA=1;
        DELAY(DELAY_TIME);
        SCL=0;
        DELAY(DELAY_TIME);
    }

    void SEND_0(void)   /* SEND ACK */
    {
        /*發(fā)送0，在SCL為高電平時(shí)使SDA信號為低*/
        SDA=0;
        SCL=1;
        DELAY(DELAY_TIME);
        SCL=0;
        DELAY(DELAY_TIME);
    }

    void SEND_1(void)
    {
        /*發(fā)送1，在SCL為高電平時(shí)使SDA信號為高*/
        SDA=1;
        SCL=1;
        DELAY(DELAY_TIME);
        SCL=0;
        DELAY(DELAY_TIME);
    }

    bit Check_Acknowledge(void)
    {
        /*發(fā)送完一個(gè)字節(jié)后檢驗(yàn)設(shè)備的應(yīng)答信號*/
        SDA=1;
        SCL=1;
        DELAY(DELAY_TIME/2);
        F0=SDA;
        DELAY(DELAY_TIME/2);
        SCL=0;
        DELAY(DELAY_TIME);
        if(F0==1)
            return FALSE;
        return TRUE;
    }

    void WriteI2CByte(char b)reentrant
    {
        /*向I2C總線寫一個(gè)字節(jié)*/
        char i;
        for(i=0;i<8;i++)
            if((b<                SEND_1();
            else
                SEND_0();
    }

    char ReadI2CByte(void)reentrant
    {
        /*從I2C總線讀一個(gè)字節(jié)*/
        char b=0,i;
        for(i=0;i<8;i++)
        {
            SDA=1;    /*釋放總線*/
            SCL=1;    /*接受數(shù)據(jù)*/
            DELAY(10);
            F0=SDA;
            DELAY(10);
            SCL=0;
            if(F0==1)
                {
                    b=b<<1;
                    b=b|0x01;
                 }
            else
                b=b<<1;
        }
        return b;
    }

/**********以下為讀寫24c02的函數(shù)**********/
void Write_One_Byte(char addr,char thedata)
{
          bit acktemp=1;
          /*write a byte to mem*/
          I2C_Start();
          WriteI2CByte(0xa0);
          acktemp=Check_Acknowledge();
          WriteI2CByte(addr);/*address*/
          acktemp=Check_Acknowledge();
          WriteI2CByte(thedata);/*thedata*/
          acktemp=Check_Acknowledge();
          I2C_Stop();

}

void Write_A_Page(char *buffer,char addr)
{
          bit acktemp=1;
          bit wrtmp;
          int i;
          /*write a page to at24c02*/
          I2C_Start();
          WriteI2CByte(0xa0);
          acktemp=Check_Acknowledge();
          WriteI2CByte(addr);/*address*/
          acktemp=Check_Acknowledge();
          for(i=0;i<7;i++)
          {
            WriteI2CByte(buffer[i]);
            if(!Check_Acknowledge())
                {
                    I2C_Stop();

                }
           }

          I2C_Stop();

}

char Read_One_Byte(char addr)
{         bit acktemp=1;
          char mydata;
           /*read a byte from mem*/
          I2C_Start();
          WriteI2CByte(0xa0);
          acktemp=Check_Acknowledge();
          WriteI2CByte(addr);/*address*/
          acktemp=Check_Acknowledge();
          I2C_Start();
          WriteI2CByte(0xa1);
          acktemp=Check_Acknowledge();

          mydata=ReadI2CByte();
          acktemp=Check_Acknowledge();

          return mydata;
          I2C_Stop();
}

void Read_N_Bytes(char *buffer,char n,char addr)
{
          bit acktemp=1;

          int i=0;
           /*read 8 bytes from mem*/
          I2C_Start();
          WriteI2CByte(0xa0);
          acktemp=Check_Acknowledge();
          WriteI2CByte(addr);/*address*/
          acktemp=Check_Acknowledge();
          I2C_Start();
          WriteI2CByte(0xa1);

          acktemp=Check_Acknowledge();

          for(i=0;i          {
                buffer[i]=ReadI2CByte();
                if(i!=n-1)
                    SEND_0();    /*發(fā)送應(yīng)答*/
                else
                    SEND_1();    /*發(fā)送非應(yīng)答*/
          }

   I2C_Stop();

}

void main()
{
          int i;
          char mybyte;
          char myarray[8];
          char myarray2[8];
          char rdarray[16];
          
          for(i=0;i<8;i++)
          {
                myarray[i]=i;
                myarray2[i]=i+0x08;     

          }

          Write_One_Byte(0x20,0x28);

          Write_A_Page(myarray,0x10);
          Write_A_Page(myarray2,0x18);

          mybyte=Read_One_Byte(0x20);
          Read_N_Bytes(rdarray,16,0x10);

}