51系列单片机模拟I2C总线

            F0=SDA;
            DELAY(10);
            SCL=0;
            if(F0==1)
                {
                    b=b<<1;
                    b=b|0x01;
作者： 疯子海   2005-7-4 21:54 　 回复此发言  

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2 【例程】51系列 单片机 模拟I2C总线                 }
            else
                b=b<<1;
        }
        return b;
    }


/**********以下为读写24c02的函数**********/
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<n;i++)
          {
                buffer[i]=ReadI2CByte();
                if(i!=n-1)
                    SEND_0();    /*发送应答*/
                else
                    SEND_1();    /*发送非应答*/
          }

   I2C_Stop();

}


void main()
{
          int i;
          char mybyte;
          char myarray[8];
          char myarray2[8];

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本文关键字：单片机  51单片机，单片机-工控设备 - 51单片机