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Serial port issues

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#1 Dr Who

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Posted 06 August 2014 - 12:48 AM


I am attempting to wrap my mind around this code:

using System;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;

namespace serial1
    public class Program
    static SerialPort serial;
    public static void Main()
        // initialize the serial port for COM1 (using D0 & D1)
        serial = new SerialPort(SerialPorts.COM1, 9600, Parity.None, 8, StopBits.One);
        // open the serial-port, so we can send & receive data
        // add an event-handler for handling incoming data
        serial.DataReceived += new SerialDataReceivedEventHandler(serial_DataReceived);
        // wait forever...
    static void serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
        // create a single byte array
        byte[] bytes = new byte[1];
        // as long as there is data waiting to be read
        while (serial.BytesToRead > 0)
            // read a single byte
            serial.Read(bytes, 0, bytes.Length);
            // send the same byte back
            serial.Write(bytes, 0, bytes.Length);

And the code was lifted from this blog http://blog.codeblac...with-RS232.aspx

All he posts is the code after the definitions. He does not explain what should installed behind the scenes. Especially since I am seeing definition errors on the named functions above. However oddly enough VS does offer some automated help.


Has anyone tried out his suggestions?

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#2 baxter


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Posted 06 August 2014 - 02:29 AM

You need to add,

using System.IO.Ports;

#3 Spiked


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Posted 06 August 2014 - 05:34 PM

And you need to use a separate serial usb cable/converter. Other than that, all the program does echo back any characters it receives.


There are a few spots in the code that bug me.  Why does he allocate a byte array of 1 byte?  just declare a byte, then use Serial readByte() and writeByte methods instead of read() and write().


I especially would not do a new byte every time I entered that delegate - very inefficient.

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