Port CRSF RC driver to new Serial UART API (#22917)

* Added implementations of Rx Tx swap and single wire for new UART API needed by CRSF driver
* Added inverted mode to Serial interface API

platforms/common/Serial.cpp

@@ -84,6 +84,11 @@ ssize_t Serial::write(const void *buffer, size_t buffer_size)
 	return _impl.write(buffer, buffer_size);
 }
 
+void Serial::flush()
+{
+	return _impl.flush();
+}
+
 uint32_t Serial::getBaudrate() const
 {
 	return _impl.getBaudrate();
@@ -134,6 +139,34 @@ bool Serial::setFlowcontrol(FlowControl flowcontrol)
 	return _impl.setFlowcontrol(flowcontrol);
 }
 
+bool Serial::getSingleWireMode() const
+{
+	return _impl.getSingleWireMode();
+}
+bool Serial::setSingleWireMode()
+{
+	return _impl.setSingleWireMode();
+}
+
+bool Serial::getSwapRxTxMode() const
+{
+	return _impl.getSwapRxTxMode();
+}
+bool Serial::setSwapRxTxMode()
+{
+	return _impl.setSwapRxTxMode();
+}
+
+bool Serial::getInvertedMode() const
+{
+	return _impl.getInvertedMode();
+}
+
+bool Serial::setInvertedMode(bool enable)
+{
+	return _impl.setInvertedMode(enable);
+}
+
 const char *Serial::getPort() const
 {
 	return _impl.getPort();

platforms/common/include/px4_platform_common/Serial.hpp

@@ -65,6 +65,8 @@ public:
 
 	ssize_t write(const void *buffer, size_t buffer_size);
 
+	void flush();
+
 	// If port is already open then the following configuration functions
 	// will reconfigure the port. If the port is not yet open then they will
 	// simply store the configuration in preparation for the port to be opened.
@@ -84,6 +86,15 @@ public:
 	FlowControl getFlowcontrol() const;
 	bool setFlowcontrol(FlowControl flowcontrol);
 
+	bool getSingleWireMode() const;
+	bool setSingleWireMode();
+
+	bool getSwapRxTxMode() const;
+	bool setSwapRxTxMode();
+
+	bool getInvertedMode() const;
+	bool setInvertedMode(bool enable);
+
 	static bool validatePort(const char *port);
 	bool setPort(const char *port);
 	const char *getPort() const;