i2c.c

I2C程序的应用 I2C程序的应用 I2C程序的应用

#include "main.h"                
#include "dip.h"  
#include "Key.h"  
#include "I2C.h"  





void MI2CStart(void) {
  pI2CSDA=1;
  pI2CSCL=1;
  NOP();
  NOP();
  pI2CSDA=0;
  NOP();
  NOP();
  NOP();
  NOP();
  pI2CSCL=0;
  return;
  }
void MI2CStop(void) {
  pI2CSCL=0;
  pI2CSDA=0;
  NOP();
  NOP();
  pI2CSCL=1;
  NOP();
  NOP();
  NOP();
  NOP();
  pI2CSDA=1;
  return;
  }
void MI2CWrite(unsigned char Value) {  
 unsigned char idata i; 
  for(i=0; i<8; i++) {
    if(Value&0x80)pI2CSDA=1;
    else pI2CSDA =0; 
    pI2CSCL=1;   
    Value<<=1;
    NOP();
    NOP();
    NOP();
    pI2CSCL=0;
    }    
   pI2CSDA=1;
   pI2CSCL=1;
   return;
  }




/*==============================================================================

==============================================================================*/ 
unsigned char MI2CRead(void) {  
 unsigned char idata i, Value=0;  
  pI2CSDA=1;
  for(i=0; i<8; i++) {
    pI2CSCL=1;
    Value<<=1;
	NOP();
    NOP();
    if(pI2CSDA)Value |=0x01;
    else Value &=0xfe; 
    pI2CSCL=0;
    }
  return Value;
  }
 

/*==============================================================================

==============================================================================*/
void MI2C_Ack(bit ack) {    
  pI2CSDA=ack; 
  NOP();
  NOP();
  pI2CSCL=1;   
  NOP();
  NOP();
  NOP();
  pI2CSCL=0;
  return;
  }


/*==============================================================================

==============================================================================*/

unsigned char MCU_Read(unsigned char address) {
  unsigned char idata Value;  	
	MI2CStart();
    MI2CWrite(0xa0); 
    MI2C_Ack(0);
    MI2CWrite(address); 
    MI2C_Ack(0);
    MI2CStart();
    MI2CWrite(0xa1);  
    MI2C_Ack(0);
    Value=MI2CRead();   
    MI2C_Ack(1);
    MI2CStop();	
    return Value;   
  }
  
 
/*==============================================================================

==============================================================================*/
void MCU_Write(unsigned char address, unsigned char bytedata){
    MI2CStart();    
    MI2CWrite(0xa0); 
    MI2C_Ack(0);
    MI2CWrite(address);  
    MI2C_Ack(0);
    MI2CWrite(bytedata); 
    MI2C_Ack(0);
    MI2CStop();  
    return;
  }