1 reply to this topic

[Dolphin_78]

Hi people i m a pleased owner of a netduino plus and recently i bought a bluetooth device JY-MCU HC-06 from dealextreme.

 

I test the device with an arduino nano v3.0 and it works perfect but when i tried with netduino, it has a weird behaviour. Send bytes works perfect but receive data works very bad. I pair it with my phone and with BlueTerm app send some data. When i send "1", byte 49, i receive byte 32.

 

Wired Netduino -> JY-MCU HC-06:

 

COM1 ( Pin 0 / RX - Pin 1 / TX ) -> TX - RX.

 

No resistors between.

 

I tested the serial communication with an arduino. Wiring Arduino serial pins to netduino serial COM1 pins and run a program for send data between both. All works perfect send and receive.

 

Anybody could help me please?.

 

This is the code for Netduino:

 

public class Program
    {
        static SerialPort serial;
        public static void Main()
        {
            serial = new SerialPort(Serial.COM1, 9600, Parity.None, 8, StopBits.One);
            serial.Open();
            serial.DataReceived += serial_DataReceived;
            Thread.Sleep(Timeout.Infinite);
        }

        static void serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            byte[] bytes = new byte[1];
            while (serial.BytesToRead > 0)
            {
                serial.Read(bytes, 0, bytes.Length);
                serial.Write(bytes, 0, bytes.Length);
            }
        }

    }

[Dolphin_78]

I tried change parity to EVEN and it begin to work partially.

 

Later i return parity to original and put the initialization of the received bytes buffer out of delegate and recompile the code again and now it works.

 

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;
using System.Text;
using System.IO.Ports;

namespace bluetooth
{
    public class Program
    {
        static byte[] bytes = new byte[1];
        static SerialPort serial;
        public static void Main()
        {
            serial = new SerialPort(Serial.COM1, 9600, Parity.None, 8, StopBits.One);
            serial.Open();
            serial.DataReceived += serial_DataReceived;
            Thread.Sleep(Timeout.Infinite);
        }

        static void serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            while (serial.BytesToRead > 0)
            {
                serial.Read(bytes, 0, bytes.Length);
                /* bytes[0] = 49; */
                serial.Write(bytes, 0, bytes.Length);
            }
        }

    }
}