From f4e690cf3c500160b2fc89a8c105e24a8f2be5b8 Mon Sep 17 00:00:00 2001
From: Erick Ahmed <engineering@erickahmed.com>
Date: Wed, 1 Oct 2025 15:34:11 +0200
Subject: [PATCH] Increase EEPROM lifespan by avoiding overwrites on addresses
 that contain identical values

---
 firmware/atmega/include/eeprom.h |  3 ++-
 firmware/atmega/source/eeprom.c  | 12 ++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/firmware/atmega/include/eeprom.h b/firmware/atmega/include/eeprom.h
index 5abff7c..d110b76 100644
--- a/firmware/atmega/include/eeprom.h
+++ b/firmware/atmega/include/eeprom.h
@@ -4,7 +4,8 @@
 #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);
+
+#endif
diff --git a/firmware/atmega/source/eeprom.c b/firmware/atmega/source/eeprom.c
index 47c3ef5..cbbcffe 100644
--- a/firmware/atmega/source/eeprom.c
+++ b/firmware/atmega/source/eeprom.c
@@ -1,7 +1,6 @@
 #include <stdint.h>
 #include <avr/io.h>
 #include <avr/interrupt.h>
-#include "config.h"
 
 uint8_t eepromRead(uint8_t address) {
     // wait for previous write
@@ -16,10 +15,11 @@ void eepromWrite(uint8_t address, uint8_t data) {
     // wait for previous write
     while (EECR & (1 << EEPE));
 
-    //write to address
-    EEAR = address;
-    EEDR = data;
+     if (eepromRead(address) != data) {
+        EEAR = address;
+        EEDR = data;
 
-    EECR |= (1 << EEMPE);
-    EECR |= (1 << EEPE);
+        EECR |= (1 << EEMPE);
+        EECR |= (1 << EEPE);
+    }
 }