eeprom.h

i2c通信

#ifndef	_EEPROM_H
#define	_EEPROM_H   
#define  EERE   0 
#define  EEWE   1 
#define  EEMWE  2 
#define  EERIE  3 

void EEPROM_Write(unsigned int uiAddress, unsigned char ucData)
{
    while(EECR & (1<<EEWE)) ;
    EEAR = uiAddress;
    EEDR = ucData;
    EECR |= (1<<EEMWE);
    EECR = (1<<EEWE);    
}

unsigned char EEPROM_Read(unsigned int uiAddress)
{
    while(EECR & (1<<EEWE)) ; 
    EEAR = uiAddress;
    EECR |= (1<<EERE);  
    return EEDR;
}
#pragma asm_function+
void EEPROM_Write_W(unsigned int uiAddress, unsigned int ucData)
{
   #asm
       ld    r22,y+
       ld    r23,y+
       ld    r24,y+
       ld    r25,y+
       ser   r31
       in    r0,0x3f
__wait:
       sbic  0x1c,1
       rjmp  __wait
       out   0x1f,r25
       out   0x1e,r24
       out   0x1d,r22
       cli
       sbi   0x1c,2
       sbi   0x1c,1
       out   0x3f,r0
       sbrs  r31,0
       ret
       subi  r24,0xff
       sbci  r25,0xff
       mov   r22,r23
       clr   r31
       rjmp  __wait
   #endasm
    
}
#pragma asm_function-

#pragma asm_function+
unsigned int EEPROM_Read_W(unsigned int uiAddress)
{
   #asm
       ld    r30,y+
       ld    r31,y+
__wait:
       sbic  0x01,1
       rjmp  __wait
       out   0x1f,r31
       out   0x1e,r30
       sbi   0x1c,0
       adiw  r30,0x01
       in    r0,0x1d
       out   0x1f,r31
       out   0x1e,r30
       sbi   0x1c,0
       mov   r30,r0
       in    r31,0x1d
       ret
   #endasm
}
#pragma asm_function-


#endif