diff --git a/firmware/config/engines/custom_engine.cpp b/firmware/config/engines/custom_engine.cpp
index d08dd47e03..a4c2c8eb76 100644
--- a/firmware/config/engines/custom_engine.cpp
+++ b/firmware/config/engines/custom_engine.cpp
@@ -17,6 +17,7 @@
 #include "mre_meta.h"
 #include "proteus_meta.h"
 #include "hellen_meta.h"
+#include "odometer.h"
 
 #if EFI_ELECTRONIC_THROTTLE_BODY
 #include "electronic_throttle.h"
@@ -304,15 +305,12 @@ void setIssue898() {
 
 #if HW_FRANKENSO && EFI_PROD_CODE
 
-#define EE_PAGE_SIZE 32
 
 // todo: page_size + 2
 // todo:  CC_SECTION(".nocache")
 static uint8_t write_buf[EE_PAGE_SIZE + 10];
 
 
-#define EE_SIZE 4096
-#define EE_U2CD I2CD3
 #define EEPROM_WRITE_TIME_MS    10          /* time to write one page in ms. Consult datasheet! */
 
 /**
diff --git a/firmware/controllers/algo/odometer.cpp b/firmware/controllers/algo/odometer.cpp
index c8585f2f95..af25a4d841 100644
--- a/firmware/controllers/algo/odometer.cpp
+++ b/firmware/controllers/algo/odometer.cpp
@@ -1,3 +1,24 @@
 #include "pch.h"
 
 #include "odometer.h"
+
+
+static odometer_state odometerCopies[2];
+
+void setCrc(odometer_state *state) {
+	state->crc = crc32(state, 4);
+}
+
+void validate(odometer_state *state) {
+	int crc = crc32(state, 4);
+	if (state->crc != crc)
+		state->totalMeters = 0;
+
+}
+
+
+void initOdometer() {
+
+
+
+}
diff --git a/firmware/controllers/algo/odometer.h b/firmware/controllers/algo/odometer.h
index 6f70f09bee..d753dcbe02 100644
--- a/firmware/controllers/algo/odometer.h
+++ b/firmware/controllers/algo/odometer.h
@@ -1 +1,19 @@
 #pragma once
+
+
+#ifndef EE_PAGE_SIZE
+#define EE_PAGE_SIZE 32
+#endif
+
+#ifndef EE_SIZE
+#define EE_SIZE 4096
+#endif
+
+#ifndef EE_U2CD
+#define EE_U2CD I2CD3
+#endif
+
+struct odometer_state {
+	int totalMeters;
+	int crc;
+};
diff --git a/firmware/hw_layer/hardware.cpp b/firmware/hw_layer/hardware.cpp
index 9e3dcfb2b8..034877e288 100644
--- a/firmware/hw_layer/hardware.cpp
+++ b/firmware/hw_layer/hardware.cpp
@@ -27,6 +27,7 @@
 #include "sensor_chart.h"
 #include "serial_hw.h"
 #include "idle_thread.h"
+#include "odometer.h"
 
 #if EFI_PROD_CODE
 #include "mpu_util.h"
@@ -503,7 +504,7 @@ void initHardware() {
 
 #if STM32_I2C_USE_I2C3
 	if (engineConfiguration->useEeprom) {
-	    i2cStart(&I2CD3, &i2cfg);
+	    i2cStart(&EE_U2CD, &i2cfg);
 	}
 #endif // STM32_I2C_USE_I2C3