[Morse] Added Doxygen comments

src/protocols/Morse.h

@@ -6,18 +6,44 @@
 
 #define MORSE_LENGTH                                  52
 
+/*!
+  \class MorseClient
+
+  \brief Client for Morse Code communication. The public interface is the same as Arduino Serial.
+*/
 class MorseClient {
   public:
+    /*!
+      \brief Default constructor.
+
+      \param phy Pointer to the wireless module providing PhysicalLayer communication.
+    */
     MorseClient(PhysicalLayer* phy);
 
     // basic methods
+
+    /*!
+      \brief Initialization method.
+
+      \param base Base RF frequency to be used in MHz.
+
+      \param speed Coding speed in words per minute.
+
+      \returns \ref status_codes
+    */
     int16_t begin(float base, uint8_t speed = 20);
+
+    /*!
+      \brief Send start signal.
+
+      \returns Number of bytes sent (always 0).
+    */
+    size_t startSignal();
+
     size_t write(const char* str);
     size_t write(uint8_t* buff, size_t len);
     size_t write(uint8_t b);
 
-    size_t startSignal();
-    
     size_t print(const String &);
     size_t print(const char[]);
     size_t print(char);