at2402.c

基于C51实现多功能钟,一键多功能,友好的液晶显示,人机界面,同时能播放音乐.绝对原创!

/* Name:AT24C02*/ 
    #include "reg52.h"
    #include "at2402.h"
   // #include "common.h"
  
   

/********** Function Definition  ************/ 

    void DELAY0(unsigned int t) 
    { 
        while(t!=0) 
            t--; 
    } 

    void I2C_Start(void) 
    { 
      
        SDA=1; 
        SCL=1; 
        DELAY0(DELAY_TIME); 
        SDA=0; 
        DELAY0(DELAY_TIME); 
        SCL=0; 
        DELAY0(DELAY_TIME); 
    } 

    void I2C_Stop(void) 
    { 
        /*I2C,SCL,SDA*/ 
        SDA=0; 
        SCL=1; 
        DELAY0(DELAY_TIME); 
        SDA=1; 
        DELAY0(DELAY_TIME); 
        SCL=0; 
        DELAY0(DELAY_TIME); 
    } 

    void SEND_0(void)   /* SEND ACK */ 
    { 
    
        SDA=0; 
        SCL=1; 
        DELAY0(DELAY_TIME); 
        SCL=0; 
        DELAY0(DELAY_TIME); 
    } 

    void SEND_1(void) 
    { 
   
        SDA=1; 
        SCL=1; 
        DELAY0(DELAY_TIME); 
        SCL=0; 
        DELAY0(DELAY_TIME); 
    } 

    bit Check_Acknowledge(void) 
    { 
      
        SDA=1; 
        SCL=1; 
        DELAY0(DELAY_TIME/2); 
        F0=SDA; 
        DELAY0(DELAY_TIME/2); 
        SCL=0; 
        DELAY0(DELAY_TIME); 
        if(F0==1) 
            return FALSE; 
        return TRUE; 
    } 

    void WriteI2CByte(char b)reentrant 
    { 
       
        char i; 
        for(i=0;i<8;i++) 
            if((b<<i)&0x80) SEND_1(); 
            else 
                SEND_0(); 
    } 

 

    char ReadI2CByte(void)reentrant 
    { 
       
        char b=0,i; 
        for(i=0;i<8;i++) 
        { 
            SDA=1;   
            SCL=1;    
            DELAY0(10); 
            F0=SDA; 
            DELAY0(10); 
            SCL=0; 
            if(F0==1) 
                { 
                    b=b<<1; 
                    b=b|0x01; 
                 } 
            else 
                b=b<<1; 
        } 
        return b; 
    } 


/**********24c0**********/ 
void Write_One_Byte(char addr,char thedata) 
{ 
          bit acktemp=1; 
          /*write a byte to mem*/ 
          I2C_Start(); 
          WriteI2CByte(0xa0); // 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); 	 //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); //0xa0
          acktemp=Check_Acknowledge(); 
          WriteI2CByte(addr);/*address*/ 
          acktemp=Check_Acknowledge(); 
          I2C_Start(); 
          WriteI2CByte(0xa1);  //0xa1
          acktemp=Check_Acknowledge(); 


          mydata=ReadI2CByte(); 
          acktemp=Check_Acknowledge(); 
          I2C_Stop(); 
          return mydata; 
          
} 
/*
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); //0xa0
          acktemp=Check_Acknowledge(); 
          WriteI2CByte(addr);//address 
          acktemp=Check_Acknowledge(); 
          I2C_Start(); 
          WriteI2CByte(0xa1); //0xa1

          acktemp=Check_Acknowledge(); 

 


          for(i=0;i<n;i++)
           { 
                buffer[i]=ReadI2CByte(); 
                if(i!=n-1) 
                    SEND_0(); 
                else 
                    SEND_1();   
          } 

   I2C_Stop(); 

} 

*/