[AFSK] Added begin method

examples/AFSK/AFSK_Tone/AFSK_Tone.ino

@@ -46,7 +46,7 @@ void setup() {
   int state = radio.beginFSK();
 
   // when using one of the non-LoRa modules for AFSK
-  // (RF69, CC1101,, Si4432 etc.), use the basic begin() method
+  // (RF69, CC1101, Si4432 etc.), use the basic begin() method
   // int state = radio.begin();
 
   if(state == ERR_NONE) {
@@ -56,17 +56,30 @@ void setup() {
     Serial.println(state);
     while(true);
   }
+
+  // initialize AFSK client
+  Serial.print(F("[AFSK] Initializing ... "));
+  state = audio.begin();
+  if(state == ERR_NONE) {
+    Serial.println(F("success!"));
+  } else {
+    Serial.print(F("failed, code "));
+    Serial.println(state);
+    while(true);
+  }
 }
 
 void loop() {
   // AFSKClient can be used to transmit tones,
   // same as Arduino tone() function
-
+  
   // 400 Hz tone
+  Serial.print(F("[AFSK] 400 Hz tone ... "));
   audio.tone(400);
   delay(1000);
 
   // silence
+  Serial.println(F("done!"));
   audio.noTone();
   delay(1000);
 

src/protocols/AFSK/AFSK.cpp

@@ -5,6 +5,10 @@ AFSKClient::AFSKClient(PhysicalLayer* phy, RADIOLIB_PIN_TYPE pin): _pin(pin) {
   _phy = phy;
 }
 
+int16_t AFSKClient::begin() {
+  return(_phy->startDirect());
+}
+
 int16_t AFSKClient::tone(uint16_t freq, bool autoStart) {
   if(freq == 0) {
     return(ERR_INVALID_FREQUENCY);

src/protocols/AFSK/AFSK.h

@@ -25,6 +25,13 @@ class AFSKClient  {
     */
     AFSKClient(PhysicalLayer* phy, RADIOLIB_PIN_TYPE pin);
 
+    /*!
+      \brief Initialization method.
+
+      \returns \ref status_codes
+    */
+    int16_t begin();
+
     /*!
       \brief Start transmitting audio tone.