DTR Flow Control

Andreas Mohr andi at rhlx01.fht-esslingen.de
Fri Mar 1 11:57:03 CST 2002

On Thu, Feb 28, 2002 at 06:42:28AM -0800, Michael Cardenas wrote:
> The parts of the source I'm using are not very different from yours.
> I picked up the latest source and tried the app and it still has the same
> behavior. It can talk to the modem enough to get it to connect to the ppp
> server, but it cannot communicate over the network.
> I've attached a trace using my app with the latest source. The application
> seems to be stuck waiting for data and using ClearCommError to check the
> number of bytes received. It calls GetOverlappedResult along with
> GetLastError to check when the pending io operation has completed.
> Maybe there's something wrong with the way overlapped io is implemented when
> it interacts with a serial port. The documentation calls for the user to
> manually set the file pointer when using overlappedio, which doesn't seem
> like it would work on a serial port. The set_file_pointer function in
> server.c doesn't check for serial ports, but I'm not familiar enough with
> serial communications under linux to know if it matters. I tried to disable
> set_file_pointer for serial ports, but this didn't seem to have any effect.
Just for the record:
I've also got some program which uses overlapped transmission and which
also doesn't work (some NEC 78K uController demo kit).

Andreas Mohr                        Stauferstr. 6, D-71272 Renningen, Germany
Tel. +49 7159 800604                http://home.nexgo.de/andi.mohr/

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