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From: "Francisco Pastor" <fpastor DOT etra-id AT gruposetra DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: help on DOS serial communication using DJGPP
Date: Wed, 5 May 2004 08:05:46 +0200
Organization: Universitat de Valencia
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Is your cable ok?

BIOS serial com use the modem control lines and, if this signal are not
correct, the communication dont work

Francisco Pastor

"mohd hamizi ahmad" <M DOT H DOT Ahmad AT lboro DOT ac DOT uk> escribió en el mensaje
news:000001c43214$915618d0$f088e783 AT emilda...
> i've tried to communicate between embedded system to PC using serial
> communication. my embedded system using DOS operating system. i've tried
> to send a character to PC and should be display on hyperterminal. i've
> tried but nothing happen. i've check my program, and i think there is no
> problem. could anybody check my simple program down here? maybe i make a
> mistake and you can tell me where my mistake.
>
> #include <stdio.h>
> #include <conio.h>
> #include <stdlib.h>
> #include <bios.h>
>
> int main()
> {
>
> unsigned com1_send;
> unsigned com1_init;
>
>
> // open serial port at 9600 baud, 8 data bits,
> // No parity, 1 stop bit
> com1_init = _bios_serialcom(_COM_INIT, 1,
> _COM_CHR8 | _COM_NOPARITY | _COM_STOP1 | _COM_9600);
> printf("Init status: 0x%4.4X\n", com1_init);
>
> while(1)
> {
> // send a push keyboard character to com2
> com1_send = _bios_serialcom(_COM_SEND, 1, (unsigned)getch());
> printf("Send status: 0x%4.4X\n", com1_send);
> }
>
> return(1);
> }
>
>