Receiving string in Serial, issue. Unity -> Arduino

Question

I'm sending a string via serial from Unity to an Arduino Mega with a baudRate of 115200. That string is parsed into an uInt_8 array and send to other arduino via i2c in packages of 12 bytes. This works great but only for the first 10 bytes (0-9) so it must have something to do with two decimals (10, 11). The string for 24 bytes looks like this ,0,255,0,055,0,025,0,255,0,etc. The values are always between 0/1, and 0/255.

void loop() {
   int serialIndex = 0;
   if(Serial.available() > 0){     
     while (0 < Serial.available()) {            // loop through all the received bytes 
        String bufferString;
        uint8_t bufferInt;
        bufferString = Serial.readStringUntil(','); 
        bufferInt = bufferString.toInt();      
        serialBuffer[serialIndex] = bufferInt;  // put current index byte in array      
        serialIndex ++;                          // add index. 
     }     
     sendBytes(); 
   }
   delay(50);
}

void sendBytes(){
    for(int i = 0; i<boards; i++){         
//        int i2cIndex = i*12;
//        for(int j = 0; j <12; j++){
//          i2cBuffer[j] = serialBuffer[j+i2cIndex];
//        }
        Wire.beginTransmission(i+1);
        Wire.write(serialBuffer, 12);
        Wire.endTransmission();  
    }
}

Can you check the check of length of bufferString to see if it it's the length you expect ? If that's ok, double check the result of the toInt() conversion. How does the sending code snippet look like ? (e.g. are you writing one byte at a time, or writing to the Serial port once with 12 chars ? — George Profenza

Maxime Coutte Maxime Coutte · Accepted Answer · 2017-12-17T10:02:52

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Receiving string in Serial, issue. Unity -> Arduino

2 Answers