Make LED PWM Timer configurable.

Src/main.c

@@ -1728,7 +1728,7 @@ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
   }
   /* USER CODE BEGIN Callback 1 */
   if (htim->Instance == TIM1) {
-      HTIM1_PeriodElapsedCallback();
+      LED_TIMER_PeriodElapsedCallback();
   }
 
   /* USER CODE END Callback 1 */

TNC/LEDIndicator.cpp

@@ -518,7 +518,7 @@ Flash& flash()
 }
 } // mobilinkd::tnc
 
-void HTIM1_PeriodElapsedCallback()
+void LED_TIMER_PeriodElapsedCallback()
 {
     using mobilinkd::tnc::flash;
 

TNC/LEDIndicator.h

@@ -19,7 +19,7 @@ void tx_off(void);
 void rx_on(void);
 void rx_off(void);
 
-void HTIM1_PeriodElapsedCallback(void);
+void LED_TIMER_PeriodElapsedCallback(void);
 
 #ifdef __cplusplus
 }