diff --git a/Core/Inc/main.h b/Core/Inc/main.h
index ced4f71..332146e 100644
--- a/Core/Inc/main.h
+++ b/Core/Inc/main.h
@@ -74,6 +74,11 @@ void Error_Handler(void);
 
 /* USER CODE BEGIN Private defines */
 
+/* LED2 helper accessors (static inline for type-safety and no linker symbol) */
+static inline void LED2_Toggle(void) { HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin); }
+static inline void LED2_On(void)     { HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_SET); }
+static inline void LED2_Off(void)    { HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET); }
+
 /* USER CODE END Private defines */
 
 #ifdef __cplusplus
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 8f27755..854e4f1 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -140,6 +140,7 @@ int main(void) {
 
       static uint32_t Tick1secRef = 0;
       if (TickChk(&Tick1secRef, 1000)) {
+         LED2_Toggle();
       }
 
       int c;