DTR Flow Control
lawson_whitney at juno.com
lawson_whitney at juno.com
Fri Feb 22 21:07:43 CST 2002
On Fri, 22 Feb 2002, Michael Cardenas wrote:
> Is DTR flow control supported?
I am not at all sure, because I don't know what it is. Hardware flow
control as understood by the Linux C library is rts/cts flow control.
>
> There's a comment in comm.c in SetCommState that says it's not, but
> EscapeCommFunction has a SETDTR case and a CLRDTR case.
>
No necessary connection. The app can manipulate those signals itself.
Flow control as I understand it is done by the modem and the OS to
prevent overrun of the FIFO and the OS's buffers, behind the app's back,
so to speak.
> Below are the lines I'm talking about.
>
> I'm working on an app that asks for DTR flow control and uses overlapped
> IO when using a modem. It establishes a modem connection, but then it
> can't send any data over the connection. I'm using an external modem on
> a serial port.
>
Probably a logfile from
wine --debugmsg +file,+comm yourapp.exe 2>&1 | tee logfile
would mean more to me than excerpts from code I help maintain. +relay
never hurts, except it takes so much space, but traces gzip pretty well.
I expect Mike McCormack, the other person who is willing to touch Wine
serial comms, will be along presently.
Lawson
---oof---
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