Implement AVR328 EEPROM handling

firmware/atmega/include/eeprom.h

@@ -0,0 +1,10 @@
+#ifndef EEPROM_H
+#define EEPROM_H
+
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "config.h"
+
+uint8_t eepromRead(uint8_t address);
+void eepromWrite(uint8_t address, uint8_t data);

firmware/atmega/source/eeprom.c

@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "config.h"
+
+uint8_t eepromRead(uint8_t address) {
+    // wait for previous write
+    while (EECR & (1 << EEPE));
+
+    //read from address
+    EEAR = address;
+    return EECR |= (1 << EERE);
+}
+
+void eepromWrite(uint8_t address, uint8_t data) {
+    // wait for previous write
+    while (EECR & (1 << EEPE));
+
+    //write to address
+    EEAR = address;
+    EEDR = data;
+
+    EECR |= (1 << EEMPE);
+    EECR |= (1 << EEPE);
+}