Portenta h7 serial communication with unity

Hardware Portenta Portenta H7
1

This is arduino code to get serial data 0 or 1 and turn on and off the built in led in portenta.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

}

const int BUFFER_SIZE = 50;
char buf[BUFFER_SIZE];

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()>0){
    int len = Serial.readBytes(buf, BUFFER_SIZE);
    if(buf[0] == '0'){
      digitalWrite(LEDB, LOW);
    }
    else if (buf[0] == '1'){
      digitalWrite(LEDB, HIGH);
    }

  }
}

And below is Unity Code.

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.IO.Ports;
using UnityEngine;
using System.Threading;
public class serialport : MonoBehaviour
{
    Thread IOThread = new Thread(DataThread);
    private static SerialPort sp;
    private static string incomingMsg = "";
    private static string outgoingMsg = "";

    private static void DataThread()
    {
        sp = new SerialPort("COM10", 115200);
        sp.Open();

        if (sp.IsOpen)
        {
            Debug.Log("serial port is opened");
        }

        while (true)
        {
            if(outgoingMsg != "")
            {
                sp.Write(outgoingMsg);
                outgoingMsg = "";
            }

            incomingMsg = sp.ReadExisting();
            Thread.Sleep(200);
        }
    }

    private void OnDestroy()
    {
        IOThread.Abort();
        sp.Close();
    }
    private void Start()
    {
        IOThread.Start();
    }
    private void Update()
    {
        if(incomingMsg != "")
        {
            Debug.Log(incomingMsg);
        }
        if (Input.GetKeyDown(KeyCode.Alpha0))
        {
            Debug.Log("0");
            outgoingMsg = "0";
        }
        else if( Input.GetKeyDown(KeyCode.Alpha1))
        {
            Debug.Log("1");
            outgoingMsg = "1";
        }
    }
}

This work well with my arduino uno but it didn't work with portenta h7. What could be the possible reason for this error?

Also as a final version I want to read IMU sensor data with portenta tx, rx pin (which is serial 1) and send and receive the data from the unity via serial communication.
So

  1. I want to check that portenta communicate with unity via serial correctly.
  2. I want to check that unity send the data to arduino correctly. But how can i keep checking this I cannot open the serial monitor when i connected it with unity.

Thanks for your every help!

2

in the code below you test your Serial for availability of the single byte, but then try to read a whole 50 bytes buffer:

I think you don't need a buffer at all. Try to read an incoming chars byte by byte:

if(Serial.available()>0){
    char c = Serial.read();
    if(c == '0'){
      digitalWrite(LEDB, LOW);
    }
    else if (c == '1'){
      digitalWrite(LEDB, HIGH);
    }

  }
1 Like
3

Thanks for your advice!

4

I solve this issue with below link.

Portenta h7 need this code
"p.DtrEnable = true;" to serial communication!