Issue arduino#241: make Serial1 release GPIO pins on end()

eriknyquist · eriknyquist · commit c59e2808e1bf · 2016-07-15T15:39:16.000-07:00
UARTClass::init() muxes out the UART pins to Arduino header pins 0/1.
Reset the mux on UARTClass::end() so that pins 0/1 can be used as GPIOs
again.
diff --git a/cores/arduino/UARTClass.cpp b/cores/arduino/UARTClass.cpp
@@ -112,6 +112,9 @@ void UARTClass::end( void )
   opened = false;
   // Clear any received data
   _rx_buffer->_iHead = _rx_buffer->_iTail;
+
+  SET_PIN_MODE(17, GPIO_MUX_MODE); // Rdx SOC PIN (Arduino header pin 0)
+  SET_PIN_MODE(16, GPIO_MUX_MODE); // Txd SOC PIN (Arduino header pin 1)
 }
 
 void UARTClass::setInterruptPriority(uint32_t priority)

Original file line number	Diff line number	Diff line change
`@@ -112,6 +112,9 @@ void UARTClass::end( void )`
`112`	`112`	`opened = false;`
`113`	`113`	`// Clear any received data`
`114`	`114`	`_rx_buffer->_iHead = _rx_buffer->_iTail;`
	`115`	`+`
	`116`	`+ SET_PIN_MODE(17, GPIO_MUX_MODE); // Rdx SOC PIN (Arduino header pin 0)`
	`117`	`+ SET_PIN_MODE(16, GPIO_MUX_MODE); // Txd SOC PIN (Arduino header pin 1)`
`115`	`118`	`}`
`116`	`119`
`117`	`120`	`void UARTClass::setInterruptPriority(uint32_t priority)`