PIC:读写24LCxx系列的EEPROM的实例C语言程序

 I2C_Done();      // Wait Start condition completed

 WriteI2C(ctrl);     // Write Control to EEPROM   
    while(SSPCON2bits.ACKSTAT);    // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 WriteI2C(addr);     // Write Address to EEPROM        
    while(SSPCON2bits.ACKSTAT);   // test for ACK condition, if received 
 I2C_Done();      // Clear SSPIF flag

    RestartI2C();                // initiate Restart condition
 I2C_Done();

 WriteI2C(ctrl+1);    // Write Control to EEPROM             
 while(SSPCON2bits.ACKSTAT);    // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 f=ReadI2C();     // Enable I2C Receiver & wait BF=1 until received data
 I2C_Done();      // Clear SSPIF flag

 NotAckI2C();     // Genarate Non_Acknowledge to EEPROM
 I2C_Done();   
                    
    StopI2C();                   // send STOP condition
 I2C_Done();      // wait until stop condition is over

 return(f);      // Return Data from EEPROM
}

//***********************************************
//*         Sequential Read from EEPROM               
//*
//*   - ctrl : Control Byte of EEPROM 
//*   - addr : Location of EEPROM   
//*   - length : Read counter
//*   - *dptr : Store EEPROM data to RAM

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//*
//***********************************************
void EE_SEQU_Read(unsigned char CTRl,unsigned char addr,unsigned char length,unsigned char *dptr)
{
 IdleI2C();                // ensure module is idle
   StartI2C();      // Start condition
 I2C_Done();      // Wait Start condition completed

 WriteI2C(ctrl);     // Write Control to EEPROM   
    while(SSPCON2bits.ACKSTAT);    // test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 WriteI2C(addr);     // Write Address to EEPROM        
    while(SSPCON2bits.ACKSTAT);   // test for ACK condition, if received 
 I2C_Done();      // Clear SSPIF flag

    RestartI2C();                // initiate Restart condition
 I2C_Done();

 WriteI2C(ctrl+1);    // Write Control to EEPROM             
 while(SSPCON2bits.ACKSTAT);    // Test for ACK condition, if received
 I2C_Done();      // Clear SSPIF flag

 while (length!=0)
 {
  *dptr=ReadI2C();   // Enable I2C Receiver & Store EEPROM data to Point buffer
  I2C_Done();
  dptr++;
  length--;
   
  if (length==0) NotAckI2C();
  else AckI2C();    // Continue read next data, send a acknowLEDge to EEPROM
 
  I2C_Done();
 }

    StopI2C();                   // send STOP condition
 I2C_Done();      // wait until stop condition is over
}

//***********************************************
//*   Check I2C action that is completed        *
//***********************************************
void I2C_Done(void)
{
 while (!PIR1bits.SSPIF);  // Completed the action when the SSPIF is Hi.
 PIR1bits.SSPIF=0;      // Clear SSPIF
}

//************************************************
//* Initial I2C Master Mode with 7 bits Address  *
//* CLOCk Speed : 100KHz @4MHz      *
//************************************************
void Initialize_I2C_Master(void)
{
 OpenI2C(MASTER,SLEW_ON);
 SSPADD= 9;
}

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