Add methods to change Rx/Tx pins

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/HardwareSerial.cpp

@@ -338,3 +338,19 @@ size_t HardwareSerial::write(uint8_t c)
 
   return 1;
 }
+
+void HardwareSerial::setRx(uint32_t _rx) {
+  _serial.pin_rx = digitalPinToPinName(_rx);
+}
+
+void HardwareSerial::setTx(uint32_t _tx) {
+  _serial.pin_tx = digitalPinToPinName(_tx);
+}
+
+void HardwareSerial::setRx(PinName _rx) {
+  _serial.pin_rx = _rx;
+}
+
+void HardwareSerial::setTx(PinName _tx){
+  _serial.pin_tx = _tx;
+}

cores/arduino/HardwareSerial.h

@@ -119,6 +119,11 @@ class HardwareSerial : public Stream
     using Print::write; // pull in write(str) and write(buf, size) from Print
     operator bool() { return true; }
 
+    void setRx(uint32_t _rx);
+    void setTx(uint32_t _tx);
+    void setRx(PinName _rx);
+    void setTx(PinName _tx);
+
     // Interrupt handlers
     static void _rx_complete_irq(serial_t* obj);
     static int _tx_complete_irq(serial_t* obj);