diff --git a/Core/Inc/main.h b/Core/Inc/main.h
index beb171b..49bae33 100644
--- a/Core/Inc/main.h
+++ b/Core/Inc/main.h
@@ -41,7 +41,7 @@ extern "C" {
 
 /* Exported constants --------------------------------------------------------*/
 /* USER CODE BEGIN EC */
-
+extern int sdc_closed;
 /* USER CODE END EC */
 
 /* Exported macro ------------------------------------------------------------*/
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 6178e7f..435abfe 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -55,7 +55,7 @@ CAN_HandleTypeDef hcan;
 UART_HandleTypeDef huart1;
 
 /* USER CODE BEGIN PV */
-
+int sdc_closed = 0;
 /* USER CODE END PV */
 
 /* Private function prototypes -----------------------------------------------*/
@@ -132,6 +132,8 @@ int main(void) {
 
     /* USER CODE BEGIN 3 */
     HAL_GPIO_TogglePin(STATUS1_GPIO_Port, STATUS1_Pin);
+    sdc_closed = HAL_GPIO_ReadPin(SDC_VOLTAGE_GPIO_Port, SDC_VOLTAGE_Pin) ==
+                 GPIO_PIN_SET;
 
     slaves_check();
     shunt_check();
diff --git a/Core/Src/ts_state_machine.c b/Core/Src/ts_state_machine.c
index 9d3c993..4c027fa 100644
--- a/Core/Src/ts_state_machine.c
+++ b/Core/Src/ts_state_machine.c
@@ -12,11 +12,6 @@ static uint32_t precharge_95_reached_timestamp = 0;
 static uint32_t charging_check_timestamp = 0;
 static uint32_t discharge_begin_timestamp = 0;
 
-static int sdc_is_closed() {
-  return HAL_GPIO_ReadPin(SDC_VOLTAGE_GPIO_Port, SDC_VOLTAGE_Pin) ==
-         GPIO_PIN_SET;
-}
-
 void ts_sm_init() {
   ts_state.current_state = TS_INACTIVE;
   ts_state.target_state = TS_INACTIVE;
@@ -68,7 +63,7 @@ TSState ts_sm_update_inactive() {
 }
 
 TSState ts_sm_update_active() {
-  if (ts_state.target_state == TS_INACTIVE || !sdc_is_closed()) {
+  if (ts_state.target_state == TS_INACTIVE || !sdc_closed) {
     discharge_begin_timestamp = HAL_GetTick();
     return TS_DISCHARGE;
   }
@@ -77,7 +72,7 @@ TSState ts_sm_update_active() {
 }
 
 TSState ts_sm_update_precharge() {
-  if (ts_state.target_state == TS_INACTIVE || !sdc_is_closed()) {
+  if (ts_state.target_state == TS_INACTIVE || !sdc_closed) {
     discharge_begin_timestamp = HAL_GetTick();
     return TS_DISCHARGE;
   }
@@ -119,7 +114,7 @@ TSState ts_sm_update_error() {
 }
 
 TSState ts_sm_update_charging_check() {
-  if (ts_state.target_state == TS_INACTIVE || !sdc_is_closed()) {
+  if (ts_state.target_state == TS_INACTIVE || !sdc_closed) {
     discharge_begin_timestamp = HAL_GetTick();
     return TS_DISCHARGE;
   }
@@ -135,7 +130,7 @@ TSState ts_sm_update_charging_check() {
 }
 
 TSState ts_sm_update_charging() {
-  if (ts_state.target_state == TS_INACTIVE || !sdc_is_closed()) {
+  if (ts_state.target_state == TS_INACTIVE || !sdc_closed) {
     discharge_begin_timestamp = HAL_GetTick();
     return TS_DISCHARGE;
   }