Added DMA enable and disable functions to hardware timers, thanks to @stevstrong

STM32F1/cores/maple/HardwareTimer.cpp

@@ -138,6 +138,15 @@ void HardwareTimer::detachInterrupt(int channel) {
     timer_detach_interrupt(this->dev, (uint8)channel);
 }
 
+
+void HardwareTimer::enableDMA(int channel) {
+    timer_dma_enable_req(this->dev, (uint8)channel);
+}
+
+void HardwareTimer::disableDMA(int channel) {
+    timer_dma_disable_req(this->dev, (uint8)channel);
+}
+
 void HardwareTimer::refresh(void) {
     timer_generate_update(this->dev);
 }

STM32F1/cores/maple/HardwareTimer.h

@@ -245,6 +245,12 @@ public:
 
     /* Escape hatch */
 
+	 /**
+     * @brief Enable/disable DMA request for the input channel.
+     */
+	void enableDMA(int channel);
+	void disableDMA(int channel);
+	
     /**
      * @brief Get a pointer to the underlying libmaple timer_dev for
      *        this HardwareTimer instance.