ATmega128A-AU EEPROM的读写

#include <iom128a.h>
#include "intrinsics.h"

// write one byte data to pointed EEPROM address
void pdd_write_eeprom_byte(u16 uiAddress, u8 ucData)
{
    char cSREG;
    
    // store SREG value
    cSREG = SREG;    
    
    // disable global interrupt
    __disable_interrupt();
    
    // Wait for completion of previous write
    while (EECR & (1 << EEWE))
    {
        ;
    }
    
    // Set up address and data registers
    EEAR = uiAddress;
    EEDR = ucData;

    // Write logical one to EEMWE
    EECR |= (1<<EEMWE);
    // Start eeprom write by setting EEWE
    EECR |= (1<<EEWE);
    
    // restore SREG value
    SREG = cSREG;
}

// read one byte data from pointed EEPROM address
u8 pdd_read_eeprom_byte(u16 uiAddress)
{
    char cSREG;
    
    // store SREG value
    cSREG = SREG;        
    
    __disable_interrupt();
    
    // Wait for completion of previous write
    while (EECR & (1 << EEWE))
    {
        ;
    }
    
    // Set up address register
    EEAR = uiAddress;    
    
    // Start eeprom read by writing EERE
    EECR |= (1 << EERE);
    
    // restore SREG value
    SREG = cSREG;
    
    // Return data from data register
    return EEDR;
}