Dear Experts,
i trying to read the data from serial port COM1,
though my program is correct i am not understanding how to provide the inputs and how to check its output,
Code:
#include <dos.h>
#include <stdio.h>
#include <conio.h>
#define PORT1 0x3F8 /* Defines Serial Port Base Address (COM1 */
void main(void){
unsigned char c = 0;
unsigned char chrctr = 0;
/*int exit = 1; */
outportb(PORT1 + 1, 0); /* Turn off interrupts */
/* PORT1 Communication Settings */
outportb(PORT1 + 3, 0x80); /* Set DLAB ON */
outportb(PORT1 + 0, 0x0C); /* Set the baud rate to 9600 */
outportb(PORT1 + 1, 0x00); /* Set Baud - Divisor latch HIGH */
outportb(PORT1 + 3, 0x03); /* 8 bits, no parity, 1 stop */
outportb(PORT1 + 2, 0xC7); /* FIFO Control Register */
outportb(PORT1 + 4, 0x0B); /* Turn on DTR, RTS, and OUT2) */
printf("Waiting on transmission from source.\nPress ESC to quit.\n");
while(chrctr != 27){ /* Execute the loop if ESC has been hit */
c = inportb(PORT1 + 5);
if (c & 0x01){
chrctr = inportb(PORT1);
printf("%d",chrctr);
}
if (kbhit()){
chrctr = getch();
outportb(PORT1, chrctr);
}
}
}"
when i execute this program at dos prompt it says
Code:
Waiting on transmission from source.\nPress ESC to quit.
and when i press escape it will come out as the loop suggest
but i want communicate through that port please tell me how to check the outputs for this program as i am not much aeware of it please experts tell me how read the data from the serial COM1.