From 2e6fe9ba6b198ffbe2250645eb70bc9607c78643 Mon Sep 17 00:00:00 2001
From: Erick Ahmed <engineering@erickahmed.com>
Date: Wed, 1 Oct 2025 00:08:25 +0200
Subject: [PATCH] Implement AVR328 EEPROM handling

---
 firmware/atmega/include/eeprom.h | 10 ++++++++++
 firmware/atmega/source/eeprom.c  | 25 +++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 firmware/atmega/include/eeprom.h
 create mode 100644 firmware/atmega/source/eeprom.c

diff --git a/firmware/atmega/include/eeprom.h b/firmware/atmega/include/eeprom.h
new file mode 100644
index 0000000..5abff7c
--- /dev/null
+++ b/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);
diff --git a/firmware/atmega/source/eeprom.c b/firmware/atmega/source/eeprom.c
new file mode 100644
index 0000000..47c3ef5
--- /dev/null
+++ b/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);
+}