[Timer] Add set prescaler register function

Signed-off-by: Frederic.Pillon <[email protected]>

Author: Tjeerdie

cores/arduino/stm32/timer.c

@@ -1086,6 +1086,17 @@ uint32_t getCCRRegister(stimer_t *obj, uint32_t channel)
   return __HAL_TIM_GET_COMPARE(&(obj->handle), channel);
 }
 
+/**
+  * @brief  Set the TIM Capture Compare Register value.
+  * @param  timer_id : id of the timer
+  * @param  prescaler : prescaler value to set for this timer.
+  * @retval None
+  */
+void setTimerPrescalerRegister(stimer_t *obj, uint32_t prescaler)
+{
+  __HAL_TIM_SET_PRESCALER(&(obj->handle), prescaler);
+}
+
 /**
   * @brief  Attached an interrupt handler
   * @param  timer_id : id of the timer

cores/arduino/stm32/timer.h

@@ -214,6 +214,7 @@ uint32_t getTimerCounter(stimer_t *obj);
 void setTimerCounter(stimer_t *obj, uint32_t value);
 void setCCRRegister(stimer_t *obj, uint32_t channel, uint32_t value);
 uint32_t getCCRRegister(stimer_t *obj, uint32_t channel);
+void setTimerPrescalerRegister(stimer_t *obj, uint32_t prescaler);
 
 uint32_t getTimerIrq(TIM_TypeDef *tim);
 uint8_t getTimerClkSrc(TIM_TypeDef *tim);