common/eeprom.c

   1 #include <avr/io.h>
   2 #include "eeprom.h"
   3
   4 #define BIT(n) (1<<(n))
   5
   6 static void eeprom_wait(void)
   7 {
   8         while(EECR&BIT(EEPE)) ;
   9 }
  10
  11 void eeprom_write(uint16_t addr, uint8_t data)
  12 {
  13         eeprom_wait();
  14         EEARH = addr>>8;
  15         EEARL = addr;
  16         EEDR = data;
  17         EECR = BIT(EEMPE);
  18         EECR |= BIT(EEPE);
  19         eeprom_wait();
  20 }
  21
  22 uint8_t eeprom_read(uint16_t addr)
  23 {
  24         eeprom_wait();
  25         EEARH = addr>>8;
  26         EEARL = addr;
  27         EECR = BIT(EERE);
  28         return EEDR;
  29 }