From:	"Martin Czamai" <M DOT Czamai AT peak-system DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	serial interface resource detection and initialization
Date:	Wed, 25 Apr 2001 10:34:50 +0200
Organization:	[neXgo] the next generation online
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hi all,

my problem is that I have a "Sure RPC DCF77" receiver from Linum, which is
connected to a PCs serial port and delivers information coded via 100 and
200ms pulses on the RXD pin of a serial interface.
Since resources can be allocated dynamically in a PCI chipset and needn't to
be located at default base-adresses like 0x3F8 (COM1) or 0x2F8 (COM2), how
can I detect the correct base adress and interrupt of a serial interface??
My PC uses the 82C371EB chipset from Intel, but when reading out the PCIs
device header at its correct location (and function), I read only the
default values which are definitly not the same I set up in BIOS.

Any idea about that??

Some additional info: if I use BIOS functions to initialize the serial
interface, the lowest baudrate I can select are 110baud. To recognize the
100 and 200ms pulses correct, I require only 50 (!) baud. This is the reason
why I require the resource-information about the serial interface to program
its timing-registers....

Thanks in advance for any comment and help

Martin
M DOT Czamai AT PEAK-System DOT com

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