AVR EEPROM Read and Write-EEWORLD

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void Write_byte_eeprom(unsigned short address,unsigned char data)

{
while (EECR&(1< EEAR = address;
EEDR = data;
EECR |= (1< EECR |= (1< }

unsigned char Read_byte_eeprom(unsigned short address)
{
while (EECR&(1< EEAR = address;
EECR |= (1<
return EEDR;
}

void Refresh_eeprom(void)
{
    unsigned char i = 0;
unsigned char check = 0;
unsigned char *p = (unsigned char *)&ram;

asm("cli");

ram.start = 0x55;
for (; i<(sizeof(ram)-1); i++)
{
     Write_byte_eeprom(i,*(p+i));
  check += *(p+i);
}
Write_byte_eeprom(i,check);

asm("sei");
}

void Read_eeprom(void)
{
    unsigned char i = 0;
    unsigned char check = 0;
unsigned char *p = (unsigned char *)&ram;

for (; i<(sizeof(ram)-1); i++)
{
     *(p+i) = Read_byte_eeprom(i);
  check += *(p+i);
}
*(p+i) = Read_byte_eeprom(i);
//取值合理性判断

if ((*(p+i) != check) || (*p != 0x55))
{
Parameter_reset();
}

}

Keywords：AVR Reference address：AVR EEPROM Read and Write

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