Eurotech Support Forums - [GM] serial port multiple access

All Forums

Hardware

Ethernet, IR, Serial, CAN and high speed data

[GM] serial port multiple access

Forum Locked

Send Topic to a Friend

Printer Friendly

Author

Topic

Joelw

30 Posts

Posted - 10 Apr 2002 : 19:59:16

Which serial devices support multiple access??

Thanks,
Joel Winarske

akidder

1519 Posts

Posted - 12 Apr 2002 : 10:45:16

Hi Joel. Windows device drivers don't support multiple access. Only one thread at a time can have a device driver open.

If you need to send data out a serial port from multiple threads, you'll either have to set up an inter-process communication mechanism or just close the port after each use.

Joelw

30 Posts

Posted - 12 Apr 2002 : 13:36:50

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceddk/html/stream_12.asp

"Note that the Windows CE implementation of the Telephony API (TAPI) requires that serial port devices support multiple access. OEMs who are using any of Microsoft’s serial port MDD implementations gain this functionality automatically. OEMs who write their own serial port MDD layers, or who opt to implement monolithic serial port drivers, must implement multiple access for themselves in order to support TAPI."

Joel

jbaik

22 Posts

Posted - 12 Apr 2002 : 14:16:57

Our Serial Driver is monolithic serial drivers.
You can't open again once it opened.
Are you just wondering our Serial Driver support multiple accesss ?
Do you need to acess Serial port from several apps ?
I think you have a reason for that.
Thanks

Topic

Forum Locked

Send Topic to a Friend

Printer Friendly

Jump To:

Eurotech Support Forums

This page was generated in 0.03 seconds.

Snitz Forums 2000