问题
I'm trying to set up the simplest possible USB communication between an Arduino and Unity 3D: sending a few bytes from the Arduino and then reading them from Unity.
I'm using an older MBP, Unity 4.6.6, and an Arduino Uno with Arduino 1.0.6.
Arduino:
void setup() {
Serial.begin(9600);
}
void loop() {
int val=45;
Serial.write(val);
delay(10);
}
Unity:
using UnityEngine;
using System.Collections;
using System.IO.Ports;
public class ardCom : MonoBehaviour {
SerialPort stream = new SerialPort("/dev/tty.usbmodem621",9600);
// Use this for initialization
void Start () {
stream.Open ();
}
// Update is called once per frame
void Update () {
int value = stream.ReadByte ();
Debug.Log (value);
}
void OnApplicationQuit()
{
stream.Close();
}
}
But... Unity keeps throwing a timeout error:
TimeoutException: The operation has timed-out. System.IO.Ports.SerialPortStream.Read (System.Byte[] buffer, Int32 offset, Int32 count) System.IO.Ports.SerialPort.read_byte () System.IO.Ports.SerialPort.ReadByte () (wrapper remoting-invoke-with-check) System.IO.Ports.SerialPort:ReadByte () ardCom.Update () (at Assets/ardCom.cs:20)
What's odd is that I've been able to get communication working the other way, from Unity to Arduino-- ye olde Blinky LED tutorial works fine.
I've tried just about every permutation of this code that I can think of, changing baudrates, delay times, Serial write and read calls on the Arduino and Unity code, and been all over the net looking for solutions. No luck.
来源：https://stackoverflow.com/questions/31205982/usb-communication-from-arduino-to-unity-timeout-error