.Net CF 2.0 SerialPort DataReceived

[Simon]

Hi all,

I'm writing a PocketPC / CE application which communicates with a
Bluetooth GPS reciever that is paired to a serial port but I'm
experiencing odd behaviour from the CF 2.0 SerialPort class.

Everything is fine first time around, but if I quit my application and
restart a few times, pretty soon (usuaully the second or third
restart) the DataReceived event stops firing on the SerialPort object.

I'm connecting with this code:-

_comPort = new SerialPort(comPortName, comBaud, comParity,
comDataBits, comStopBits);

_comPort.Encoding = Encoding.ASCII;
_comPort.Handshake = comHandshake;
_comPort.ReceivedBytesThreshold = 1;
_comPort.DataReceived += new
SerialDataReceivedEventHandler(DataReceived);
_comPort.Open();

My DataReceived handler contains the following code:-

string newData = _comPort.ReadExisting();

When the app exits, I'm disconnecting / closing with:-

if (_comPort != null)
{
if (_comPort.IsOpen) _comPort.Close();

_comPort.Dispose();
_comPort = null;
}

Everything works fine on the first run, but after a couple of restarts
DataReceived stops firing. Any ideas?

Many TIA,



Simon

 

[Hakan Fatih YILDIRIM]

hi Simon,

sorry. it is not about the topic but do you have any gps data parser
written in c#?

 

[Guest]

There's a free one here:
http://www.opennetcf.com/sharedsource/serial.ocf


--

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Managed Code in an Embedded World
www.OpenNETCF.com

 

[Dick Grier]

Hi,

I also have one written in C# in my book (see below) -- it isn't quite free,
but there is other code that you might find to be useful, too.

Dick

--
Richard Grier, MVP
Hard & Software
Author of Visual Basic Programmer's Guide to Serial Communications, Fourth
Edition,
ISBN 1-890422-28-2 (391 pages, includes CD-ROM). July 2004, Revised March
2006.
See www.hardandsoftware.net for details and contact information.

 

[Rainer Borchmann]

Hi,

I also have one written in C# in my book (see below) -- it isn't quite free,
but there is other code that you might find to be useful, too.

Dick

Hi Dick,

did in your book are some code for Compactframwork ?
bye
Rainer

 

[Guest]

In this business I'd say the price of a book is free or even net positive,
as you gain way more than $50 if you learn much of anything from it.


--

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Managed Code in an Embedded World
www.OpenNETCF.com

 

[Dick Grier]

Hi,

Yes, Chapter 9 covers serial communications using the Compact Framework.

Dick

--
Richard Grier, MVP
Hard & Software
Author of Visual Basic Programmer's Guide to Serial Communications, Fourth
Edition,
ISBN 1-890422-28-2 (391 pages, includes CD-ROM). July 2004, Revised March
2006.
See www.hardandsoftware.net for details and contact information.

 

[Simon]

hi Simon,

sorry. it is not about the topic but do you have any gps data parser
written in c#?

I do, yes, but parsing the NMEA data is the interesting bit. Unless
you're *really* pushed for time, forget copy/paste development and
roll your own. There's pretty much everything you need on the
following page:-

http://www.kh-gps.de/nmea-faq.htm