Serial port driver for WINCE 6

I'm working on an application which uses serial port to communicate with
some external devices. I used friendlyarm mini2440 and Wince5 and
everything was OK but when I switched to wince 6 I got new problem in
serial port.
The communication still works but sometimes(almost) incoming data from
device isn't read completely and some bytes are lost. I tested different
serial baud rates, device protocol and so on but there was no success. The
same application works fine on wince5 so I guess there is something wrong
with serial drivers for wince6. 

Does anybody has suggestion about this problem?

i have this problem too, i don't use WinCe5 yet but when i connect my
Magnetic card reader to my device i don't get any data but when i use
similar program in Xp i can get card reader data, when i connect my device
to Xp i can send and receive data too, please help me this is so important.

and Dear A.G, if you use a english version of WinCe5 can you get me link of
your Wince? thanks a lot.

what type of screen is it?

i m using 3.5 inch lcd

hey danics, maybe your problem related to this topic:
http://www.andahammer.com/faq/?PHPSESSID=80344caa9a3dbe737a8e2edc5b6f9bd8
please notice to second question, it's about how to wired the mini2440 DB9
as a DCE device.

Dear Meysam, i dont understand exactly what are DB9 and DCE? please give me
some more information!

i connect Magnetic card reader to the PC with RS232 cable, i get card
information, but when i connect this reader with same cable to my mini2440
i cant get any data,so whats the problem?

DTE stands for Data Terminal Equipment, and DCE stands for Data
communications Equipment. DTE is typically either a dumb terminal or the
serial port on a computer/workstation.DCE is typically a modem, DSU/CSU, or
other piece of data communications equipment, hence the names.you can find
more there:
http://www.google.com/url?sa=t&source=web&cd=2&ved=0CB4QFjAB...
so in cabling to connect a DCE device such as mini2440 to another DCE
device like your card reader you should notice they have same manner in
data transmission.so in simple way,if you connected a Magnetic card reader
to the PC with RS232 cable and you going to do it by mini2440 you have to
make new cable with revert TX,RX connections, It means you have to connect
Rx pin to Tx and vice versa in new cable.

thanks a lot Meysam, i test that with my card reader and then let you know.
thanks a lot , i think this resolve can solve my problem thanks a lot. i
think you can speak in Persian too, if you havent problem i have so many
question of you, thanks again.

you're welcome
yes,I'm Persian but It's better If you ask your questions in this forum
whither people can help you more and learn about that too,you can be sure
we will help you.

ok thanks again Meysam, i change Rx and Tx and i get some data but those
didn't appear good. i get some data like this: ???":":":"

i check my baudrate and another properties and they seem good,

then i check my DB9 connectors again, but those seem havent any problem,

now i test my connector with a AVR programmer, i create a application with
Bascom and i get a text with use of Input syntax,i print a "Hello" on
connected device like Pc or mini2440 and send a 15 length text. on PC i get
"Hello" and i can send text successfully, but in mini2440 i get "Hello" but
i cant send any data.

so whats the problem again, i m so tired from this SerialPort class please
help me?

thanks a lot.

First you have to test sent command and what what's received on the
device,so for this purpose you should connect the mini2440 by its serial
cable(I suppose you used it to load Wince on your mini2440) to your PC and
use HyperTerminal from your PC and vxHpc on your mini2440 to monitor data
transmission on mini2440 serialport.you can find vxHpc here:
http://www.cam.com/vxhpc.html
Second if you made new serial cable,you have to check other pin connections
to be same as original cable.maybe there are some short circuits between
some pins in serial wiring(almost 4-6 pins).
please let me know about results

Can you mail me your code, so I can check.... it.
thanks(zgulkhan@yahoo.com)