diff --git a/ESP-IDF_Robot/main/rc.h b/ESP-IDF_Robot/main/rc.h
index e389627bb..b06820af5 100644
--- a/ESP-IDF_Robot/main/rc.h
+++ b/ESP-IDF_Robot/main/rc.h
@@ -21,12 +21,13 @@ struct motors_rpm m;
 static int adc_raw[2][10];
 static int voltage[2][10];
 static int s = 0, sample = 5, x = 0, y = 0, x_sum = 0, y_sum = 0;
-static bool adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle);
-static void adc_calibration_deinit(adc_cali_handle_t handle);
+
 adc_cali_handle_t adc1_cali_chan0_handle, adc1_cali_chan1_handle;
 adc_oneshot_unit_handle_t adc1_handle;
 bool do_calibration1_chan0, do_calibration1_chan1;
 
+static bool adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle);
+static void adc_calibration_deinit(adc_cali_handle_t handle);
 static int interpolate_raw_val (int raw);
 static int rescale_raw_val (int raw);