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#include <stdio.h>
#include <conio.h>
#define PORT1 0x3F8
/* Defines Serial Ports Base Address */
/* COM1 0x3F8 this I/O base address for serial port 1 */
/* COM2 0x2F8 */
/* COM3 0x3E8 */
/* COM4 0x2E8 */
void main(void)
{
int c; /* content of a register – a byte*/
int ch; /* date byte */
outportb(PORT1 + 1 , 0); /* Turn off interrupts - Port1 (modifying IER)*/
/* PORT 1 - Communication Settings */
outportb(PORT1 + 3 , 0x80); /* LCR access - SET DLAB ON */
outportb(PORT1 + 0 , 0x03); /* Set Baud rate-Divisor Latch Low Byte */
/* Default 0x03 = 38,400 BPS */
/* 0x01 = 115,200 BPS */
/* 0x02 = 57,600 BPS */
/* 0x06 = 19,200 BPS */
/* 0x0C = 9,600 BPS */
/* 0x18 = 4,800 BPS */
/* 0x30 = 2,400 BPS */
outportb(PORT1 + 1 , 0x00); /* Set Baud rate - Divisor Latch High Byte */
outportb(PORT1 + 3 , 0x03); /*LCR access:8 Bits, No Parity, 1 Stop Bit */
outportb(PORT1 + 2 , 0xC7); /*FCR access:FIFO Control Register */
outportb(PORT1 + 4 , 0x0B); /*MCR access:Turn on DTR,RTS,and OUT2 */
printf("nSample Comm's Program. Press ESC to quit n");
do { c = inportb(PORT1 + 5); /* Check to see if char has been */
/* received. Accessing LSR register */
if (c & 1) { /* data is ready */
ch = inportb(PORT1 + 0); /* access RBR- get Char */
printf("%c",ch);} /* Print Char to Screen */
if (kbhit()){ ch = getch(); /* If key pressed, get Char */
outportb(PORT1 + 0, ch);} /* access THR - Send Char to Serial Port */
} while (ch !=27); /* Quit when ESC (ASC 27) is pressed */
}
/* end of polling based I/O example for
serial ports */
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