Updated examples for callback receive mode

examples/LoRaDuplexCallback/LoRaDuplexCallback.ino

@@ -26,6 +26,8 @@ byte destination = 0xFF;      // destination to send to
 long lastSendTime = 0;        // last send time
 int interval = 2000;          // interval between sends
 
+volatile bool doRead = false; // Flag set by callback to perform read process in main loop
+
 void setup() {
   Serial.begin(9600);                   // initialize serial
   while (!Serial);
@@ -46,6 +48,13 @@ void setup() {
 }
 
 void loop() {
+
+  // If ISR set the flag, perform read operations
+  if (doRead) {
+    readMessage();
+    doRead = false; // Set flag back to false so next read will happen only after next ISR event
+  }
+
   if (millis() - lastSendTime > interval) {
     String message = "HeLoRa World!";   // send a message
     sendMessage(message);
@@ -56,20 +65,7 @@ void loop() {
   }
 }
 
-void sendMessage(String outgoing) {
-  LoRa.beginPacket();                   // start packet
-  LoRa.write(destination);              // add destination address
-  LoRa.write(localAddress);             // add sender address
-  LoRa.write(msgCount);                 // add message ID
-  LoRa.write(outgoing.length());        // add payload length
-  LoRa.print(outgoing);                 // add payload
-  LoRa.endPacket();                     // finish packet and send it
-  msgCount++;                           // increment message ID
-}
-
-void onReceive(int packetSize) {
-  if (packetSize == 0) return;          // if there's no packet, return
-
+void readMessage() {
   // read packet header bytes:
   int recipient = LoRa.read();          // recipient address
   byte sender = LoRa.read();            // sender address
@@ -104,3 +100,20 @@ void onReceive(int packetSize) {
   Serial.println();
 }
 
+void sendMessage(String outgoing) {
+  LoRa.beginPacket();                   // start packet
+  LoRa.write(destination);              // add destination address
+  LoRa.write(localAddress);             // add sender address
+  LoRa.write(msgCount);                 // add message ID
+  LoRa.write(outgoing.length());        // add payload length
+  LoRa.print(outgoing);                 // add payload
+  LoRa.endPacket();                     // finish packet and send it
+  msgCount++;                           // increment message ID
+}
+
+void onReceive(int packetSize) {
+  if (packetSize == 0) return;          // if there's no packet, return
+
+  doRead = true;                        //Set flag to perform read in main loop
+}
+

examples/LoRaReceiverCallback/LoRaReceiverCallback.ino

@@ -1,6 +1,9 @@
 #include <SPI.h>
 #include <LoRa.h>
 
+volatile bool doRead = false; // Flag set by callback to perform read process in main loop
+volatile int incomingPacketSize;
+
 void setup() {
   Serial.begin(9600);
   while (!Serial);
@@ -20,15 +23,19 @@ void setup() {
 }
 
 void loop() {
-  // do nothing
+  // If ISR set the flag, perform read operations
+  if (doRead) {
+    readMessage();
+    doRead = false; // Set flag back to false so next read will happen only after next ISR event
+  }
 }
 
-void onReceive(int packetSize) {
+void readMessage() {
   // received a packet
   Serial.print("Received packet '");
 
   // read packet
-  for (int i = 0; i < packetSize; i++) {
+  for (int i = 0; i < incomingPacketSize; i++) {
     Serial.print((char)LoRa.read());
   }
 
@@ -37,3 +44,8 @@ void onReceive(int packetSize) {
   Serial.println(LoRa.packetRssi());
 }
 
+void onReceive(int packetSize) {
+  doRead = true;
+  incomingPacketSize = packetSize;
+}
+