From 95d809566b73daffae468851963b0014b4c4182d Mon Sep 17 00:00:00 2001
From: Kateryna Makarova <kateryna.makarova@tuhh.de>
Date: Wed, 25 Sep 2024 12:14:59 +0200
Subject: [PATCH] Update Sender_Encoder.ino
---
Sender_Encoder.ino | 57 ++++++++++++++++++++++++++++++++++------------
1 file changed, 43 insertions(+), 14 deletions(-)
diff --git a/Sender_Encoder.ino b/Sender_Encoder.ino
index 5face69..3694629 100644
--- a/Sender_Encoder.ino
+++ b/Sender_Encoder.ino
@@ -5,11 +5,13 @@ The primary board (Board 1) sends data to a secondary board (Board 2) via serial
const int ledPin = PE1; // LED pin to indicate data sent (Blink Yellow)
HardwareSerial mySerial(D0, D1); // RX = D0, TX = D1
+const int maxRetransmissions = 3; // Maximum number of retransmissions
+const unsigned long responseTimeout = 2000; // Timeout in milliseconds
void setup() {
- pinMode(ledPin, OUTPUT); // Set LED pin as output
- Serial.begin(9600); // Communication with PC
- mySerial.begin(9600); // Communication with Board 2 via USART
+ pinMode(ledPin, OUTPUT); // Set LED pin as output
+ Serial.begin(9600); // Communication with PC
+ mySerial.begin(9600); // Communication with Board 2 via USART
}
void loop() {
@@ -23,24 +25,51 @@ void loop() {
digitalWrite(ledPin, HIGH);
delay(1000); // LED on for 1000ms
digitalWrite(ledPin, LOW);
- delay(2000); // Wait 2 second before sending the next message
+
+ // Wait for the acknowledgment or error message
+ if (!waitForResponse(encodedMessage)) {
+ Serial.println("Error: No response from Board 2, reached retransmission limit.");
+ }
}
-
- if (mySerial.available() > 0) {
- String receivedData = mySerial.readStringUntil('\n'); // Read response from Board 2
- Serial.println("Received from Board 2: " + receivedData);
-
- if (receivedData.startsWith("Error")) {
- // Handle retransmission if necessary
- String lastMessage = receivedData.substring(receivedData.indexOf(':') + 1);
- lastMessage.trim(); // Remove leading and trailing whitespace
+}
+
+bool waitForResponse(String lastMessage) {
+ int retransmissionCount = 0;
+ unsigned long startTime = millis();
+
+ while (retransmissionCount < maxRetransmissions) {
+ if (mySerial.available() > 0) {
+ String receivedData = mySerial.readStringUntil('\n'); // Read response from Board 2
+ Serial.println("Received from Board 2: " + receivedData);
+
+ if (receivedData.startsWith("Error")) {
+ // Handle retransmission if necessary
+ retransmissionCount++;
+ Serial.println("Error detected. Retransmitting...");
+ sendMessageToBoard2(lastMessage);
+ delay(1000); // Delay before retransmitting
+ } else {
+ // Valid response received, no need to retransmit
+ return true;
+ }
+ }
+
+ // Timeout check
+ if (millis() - startTime > responseTimeout) {
+ Serial.println("Response timeout. Retrying...");
+ retransmissionCount++;
sendMessageToBoard2(lastMessage);
+ delay(1000); // Delay before retransmitting
+ startTime = millis(); // Reset timeout counter
}
}
+
+ // Retransmission limit reached
+ return false;
}
void sendMessageToBoard2(String message) {
- mySerial.println(message); // Send message to Board 2
+ mySerial.println(message); // Send message to Board 2
}
String encodeData(String data) {
--
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