[RF69] Added missing example

examples/RF69/RF69_Transmit_Interrupt/RF69_Transmit_Interrupt.ino

@@ -0,0 +1,98 @@
+/*
+   RadioLib RF69 Transmit with Interrupts Example
+
+   This example transmits FSK packets with one second delays
+   between them. Each packet contains up to 64 bytes
+   of data, in the form of:
+    - Arduino String
+    - null-terminated char array (C-string)
+    - arbitrary binary data (byte array)
+*/
+
+// include the library
+#include <RadioLib.h>
+
+// RF69 module is in slot A on the shield
+RF69 rf = RadioShield.ModuleA;
+
+void setup() {
+  Serial.begin(9600);
+
+  // initialize RF69 with default settings
+  Serial.print(F("[RF69] Initializing ... "));
+  // carrier frequency:                   434.0 MHz
+  // bit rate:                            48.0 kbps
+  // Rx bandwidth:                        125.0 kHz
+  // frequency deviation:                 50.0 kHz
+  // output power:                        13 dBm
+  // sync word:                           0x2D01
+  int state = rf.begin();
+  if (state == ERR_NONE) {
+    Serial.println(F("success!"));
+  } else {
+    Serial.print(F("failed, code "));
+    Serial.println(state);
+    while (true);
+  }
+
+  // set the function that will be called 
+  // when packet transmission is finished
+  rf.setDio0Action(setFlag);
+
+  // start transmitting the first packet
+  Serial.print(F("[RF69] Sending first packet ... "));
+
+  // you can transmit C-string or Arduino string up to
+  // 64 characters long
+  state = rf.startTransmit("Hello World!");
+
+  // you can also transmit byte array up to 64 bytes long
+  /*
+    byte byteArr[] = {0x01, 0x23, 0x45, 0x56,
+                      0x78, 0xAB, 0xCD, 0xEF};
+    state = rf.transmit(byteArr, 8);
+  */
+  
+  if (state != ERR_NONE) {
+    Serial.print(F("failed, code "));
+    Serial.println(state);
+  }
+}
+
+// flag to indicate that a packet was received
+volatile bool transmittedFlag = false;
+
+void setFlag(void) {
+  // packet transmission is finished, set the flag
+  transmittedFlag = true;
+}
+
+void loop() {
+  // check if the previous transmission finished
+  if(transmittedFlag) {
+    Serial.println(F("[RF69] Packet transmission finished!"));
+
+    // wait one second before next transmission
+    delay(1000);
+
+    // send another packet
+    Serial.print(F("[RF69] Sending another packet ... "));
+
+    // you can transmit C-string or Arduino string up to
+    // 64 characters long
+    int state = rf.startTransmit("Hello World!");
+  
+    // you can also transmit byte array up to 256 bytes long
+    /*
+      byte byteArr[] = {0x01, 0x23, 0x45, 0x56,
+                        0x78, 0xAB, 0xCD, 0xEF};
+      int state = rf.transmit(byteArr, 8);
+    */
+    
+    if (state != ERR_NONE) {
+      Serial.print(F("failed, code "));
+      Serial.println(state);
+    }
+  }
+
+}