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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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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);
> }
>
>

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