feat(iwdg): enable LED-driven watchdog refresh

Core/Src/iwdg.c

@@ -38,7 +38,7 @@ void MX_IWDG_Init(void)
 
   /* USER CODE END IWDG_Init 1 */
   hiwdg.Instance = IWDG;
-  hiwdg.Init.Prescaler = IWDG_PRESCALER_4;
+  hiwdg.Init.Prescaler = IWDG_PRESCALER_64;
   hiwdg.Init.Reload = 4095;
   if (HAL_IWDG_Init(&hiwdg) != HAL_OK)
   {

Core/Src/main.c

@@ -117,6 +117,9 @@ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
         if (g_led_blink_ticks >= 1000u) {
             g_led_blink_ticks = 0u;
             LED_Toggle();
+            if (hiwdg.Instance == IWDG) {
+                HAL_IWDG_Refresh(&hiwdg);
+            }
         }
     }
 }
@@ -530,9 +533,6 @@ static void App_Poll(void)
         NVIC_SystemReset();
     }
 
-    if (hiwdg.Instance == IWDG) {
-        HAL_IWDG_Refresh(&hiwdg);
-    }
 }
 /* USER CODE END 0 */
 
@@ -547,6 +547,7 @@ int main(void)
   MX_USART3_UART_Init();
   MX_SPI1_Init();
   MX_TIM4_Init();
+  MX_IWDG_Init();
 
   LED_Init();
   LED_StartBlink();