Date: Thu, 6 Jan 2000 14:27:26 +0100 (CET)
From: Gerald Emig <[EMAIL PROTECTED]>
I had a similar problem with SuSE 6.2 when I ported a serial communication
program which runs very stable under SuSE 5.3.
What happend: from time to time the serial receiver was locked, that means
no more characters could be received.
The program talks to a SIEMENS S5 plc over its programming device
connector. Sometimes the SIMATIC sends a BREAK, and then the receiver
locks!
Checking your hint, Jean-Marie, I initialized the port manually; but no
success.
It semms to be a bug in the serial driver.
Do you have more proof that it's a bug in the serial driver? It's not
clear to me what the dongle is doing, and I certainly don't have a
prayer of investigating and perhaps fixing a problem (if it exists)
given how much information you've given.
If you really think it's a serial driver problem, find the line
#undef SERIAL_DEBUG_INTR
and change the "#undeF" to a "#define" and then recompile and install
the serial driver.
Do this for both an old kernel and a new kernel, and send me the traces
for both. Oh, and send me a full set of the termios settings for the
port as well.
The workaround which I did in my software was closing the port and open it
again.
Hmm.... is the CLOCAL flag turned off, per chance, and the carrier
detect line dropping, forcing the a hangup condition? That's what it
sounds like. Why don't you enable SERIAL_DEBUG_HANGUP while you're at
it.
- Ted
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