Some people ask me to have any soft start guide using microframework serial port. Well, as you know in desktop apps is the typical “Hello World”, the translation into serial port apps are “Echo for response”.

This code shows how to open the serial port to read incoming bytes and resend it as an echo. Is the first brick to check that the UART is all right! After this lab, you are ready to build your own DCE/DTE protocol and play serial commands between both sides.

Imports System.IO.Ports
Imports System.Text
 
Imports Microsoft.SPOT
Imports Microsoft.SPOT.Hardware
 
Module EchoResponse
 
    Private WithEvents SerialComm As SerialPort =
        New SerialPort("COM1", 9600, Parity.None, 8, StopBits.One)
 
    Private DataReceived As String = ""
    Private PortActivity As New OutputPort(CType(55, Cpu.Pin), False)
 
    Sub Main()
        SerialComm.Open()
        ' include your functions here
        Thread.Sleep(Timeout.Infinite)
    End Sub
 
    Private Sub SerialIn() Handles SerialComm.DataReceived
        PortActivity.Write(True)
        Dim Length As Integer = SerialComm.BytesToRead
        Dim Frame(Length) As Byte
        SerialComm.Read(Frame, 0, Length)
        SerialComm.Write(Frame, 0, Length)
        DataReceived = ""
        PortActivity.Write(False)
    End Sub
End Module

Enjoy!! PepLluis,