diff --git a/inc/adc.h b/inc/adc.h
--- a/inc/adc.h
+++ b/inc/adc.h
@@ -20,6 +20,7 @@ enum _adc_reading_id
 };
 
 uint16_t get_viout_counts(void);
+uint16_t get_vgiout_counts(void);
 uint16_t get_vbat_counts(void);
 
 /* USER CODE END Includes */