From: "Florent" <florent AT oih DOT rwth-aachen DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: com1 programming .... a lot of question
Date: Wed, 17 May 2000 17:26:09 +0200
Organization: Aachen University of Technology (RWTH)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,
I'm trying to send datas in the com1 to a controller in order to pilot a
machine.

I have some questions about the functions _bios_serialcom.

 I use : state= _bios_serialcom(_COM_STATUS,0,byte);

then I want to test byte with all the values in order to get the settings of
the COM1, I do :

if ((byte&_COM_9600)==_COM_9600) printf ("9600 bauds);


But I have problems because when I init the com1 at 9600bauds (with
_COM_INIT) and then I test the status of the com1, the settings are not 9600
bauds, it's always 110bauds !

Do I test it in the wrong way or ..... ???


For _COM_INIT I do :

state=_bios_serialcom(_COM_INIT,0,_COM_9600 | _COM_CHR8 | _COM_STOP1 |
_COM_NOPARITY);

There is something strange also, I test the constante _COM_STOP1, _COM_STOP2
and _COM_EVENPARITY and there are egal to 0 !!!! Hwo can I know if my
settings is one stop bit or 2 if both constante egal to 0 !!

In order to know the value of all constant of _bios_serialcom I have done :

printf("%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x|%#x",_COM_CH
R7,_COM_CHR8,_COM_STOP1,_COM_NOPARITY,
_COM_ODDPARITY,_COM_EVENPARITY,_COM_110,_COM_150,
_COM_300,_COM_600,_COM_1200,_COM_2400,_COM_4800,_COM_9600);


thank you for your help ...

Florent.