[RF69] Added interrupt receive example

examples/RF69_Receive_Interrupt/RF69_Receive_Interrupt.ino

@@ -0,0 +1,104 @@
+#include <KiteLib.h>
+
+RF69 rf = Kite.ModuleA;
+
+void setup() {
+  Serial.begin(9600);
+  
+  // initialize RF69 with default settings
+  Serial.print(F("Initializing ... "));
+  
+  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 new packet is received
+  lora.setDio0Action(setFlag);
+  
+  // start listening for packets
+  Serial.print(F("Starting to listen ... "));
+  state = rf.startReceive();
+  if (state == ERR_NONE) {
+    Serial.println(F("success!"));
+  } else {
+    Serial.print(F("failed, code "));
+    Serial.println(state);
+    while (true);
+  }
+
+  // if needed, 'listen' mode can be disabled by calling
+  // any of the following methods:
+  //
+  // lora.standby()
+  // lora.sleep()
+  // lora.transmit();
+  // lora.receive();
+  // lora.scanChannel();
+}
+
+// flag to indicate that a packet was received
+volatile bool receivedFlag = false;
+
+// disable interrupt when it's not needed
+volatile bool enableInterrupt = true;
+
+// this function is called when a complete packet
+// is received by the module
+// IMPORTANT: this function MUST be 'void' type
+//            and MUST NOT have any arguments!
+void setFlag(void) {
+  // check if the interrupt is enabled
+  if(!enableInterrupt) {
+    return;
+  }
+
+  // we got a packet, set the flag
+  receivedFlag = true;
+}
+
+void loop() {
+  // check if the flag is set
+  if(receivedFlag) {
+    // disable the interrupt service routine while
+    // processing the data
+    enableInterrupt = false;
+
+    // reset flag
+    receivedFlag = false;
+    
+    // you can read received data as an Arduino String
+    String str;
+    int state = rf.readData(str);
+  
+    // you can also read received data as byte array
+    /*
+      byte byteArr[8];
+      int state = lora.receive(byteArr, 8);
+    */
+    
+    if (state == ERR_NONE) {
+      // packet was successfully received
+      Serial.println("Received packet!");
+  
+      // print data of the packet
+      Serial.print("Data:\t\t\t");
+      Serial.println(str);
+  
+      // print RSSI (Received Signal Strength Indicator) 
+      Serial.print("RSSI:\t\t\t");
+      Serial.print(lora.lastPacketRSSI);
+      Serial.println(" dBm");
+    }
+
+    // we're ready to receive more packets,
+    // enable interrupt service routine
+    enableInterrupt = true;
+  }
+
+}