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From: "mohd hamizi ahmad" <M DOT H DOT Ahmad AT lboro DOT ac DOT uk>
To: <djgpp AT delorie DOT com>
Subject: help on DOS serial communication using DJGPP
Date: Tue, 4 May 2004 21:15:03 +0100
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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); 
}