[RTTY] Updated example

examples/SX127x_RTTY_Transmit/SX127x_RTTY_Transmit.ino

@@ -25,75 +25,77 @@ void setup() {
   Serial.begin(9600);
 
   // initialize SX1278
-  Serial.print("[SX1278] Initializing ... ");
-  // carrier frequency:           434.4 MHz
+  Serial.print(F("[SX1278] Initializing ... "));
+  // carrier frequency:           434.0 MHz
   // bit rate:                    48.0 kbps
   // frequency deviation:         50.0 kHz
   // Rx bandwidth:                125.0 kHz
   // output power:                13 dBm
   // current limit:               100 mA
   // sync word:                   0x2D  0x01
-  int state = fsk.beginFSK(434.4);
+  int state = fsk.beginFSK();
   if(state == ERR_NONE) {
-    Serial.println("success!");
+    Serial.println(F("success!"));
   } else {
-    Serial.print("failed, code ");
+    Serial.print(F("failed, code "));
     Serial.println(state);
     while(true);
   }
 
   // initialize RTTY client
-  Serial.print("[RTTY] Initializing ... ");
-  state = rtty.begin(434.4, 183, 45);
-  // low frequency:               434.4 MHz
-  // frequency shift:             183 Hz (must be divisible by 61!)
+  // NOTE: RTTY frequency shift MUST be divisible by 61 Hz!
+  Serial.print(F("[RTTY] Initializing ... "));
+  // low frequency:               434.0 MHz
+  // frequency shift:             183 Hz
   // baud rate:                   45 baud
   // data bits:                   8
   // stop bits:                   1
+  state = rtty.begin(434, 183, 45);
   if(state == ERR_NONE) {
-    Serial.println("success!");
+    Serial.println(F("success!"));
   } else {
-    Serial.print("failed, code ");
+    Serial.print(F("failed, code "));
     Serial.println(state);
     while(true);
   }
 }
 
 void loop() {
-  Serial.println("Sending RTTY data ... ");
+  Serial.println(F("Sending RTTY data ... "));
   
-  // send 500 ms high frequency beep
-  rtty.leadIn(500);
+  // send out idle condition for 500 ms
+  rtty.idle();
+  delay(500);
 
   // RTTYClient supports all methods of the Serial class
+
+  // Arduino String class
   String aStr = "Arduino String";
-  rtty.print(aStr);
   rtty.println(aStr);
 
-  const char cStr[] = "C-string";
-  rtty.print(cStr);
-  rtty.println(cStr);
+  // character array (C-string)
+  rtty.println("C-string");
 
-  char c = 'c';
-  rtty.print(c);
-  rtty.println(c);
+  // character
+  rtty.println('c');
   
-  byte b = 0xAA;
-  rtty.print(b, HEX);
-  rtty.println(b, HEX);
+  // byte
+  // formatting DEC/HEX/OCT/BIN is supported for
+  // any integer type (byte/int/long)
+  rtty.println(255, HEX);
 
+  // integer number
   int i = 1000;
-  rtty.print(i);
   rtty.println(i);
 
-  float f = 3.1415;
-  rtty.print(f, 3);
+  // floating point number
+  float f = -3.1415;
   rtty.println(f, 3);
 
   // turn transmitter off
   fsk.standby();
 
-  Serial.println("done!");
+  Serial.println(F("done!"));
 
   // wait for a second before transmitting again
   delay(1000);