Thread: serial interface problem

hello everyone
i am trying to interface my serial port with my project circuit but the program does not work at all.
the program works fine in turbo c version 2 and the responses from my circuit are sent to my pc via the serial port.
but when i use the same program in turbo c version 4.5 it does not work at all.
following is my c code...please help

Code:

#include <stdio.h>
#include <conio.h>
#define PORT1 0x3F8

void main(void)
{

char c,ch;
clrscr();

 outportb(PORT1 + 1 , 0);   /* Turn off interrupts - Port1 */

 outportb(PORT1 + 3 , 0x80);  /* SET DLAB ON */
 outportb(PORT1 + 0 , 0x02);  /* Set Baud rate - Divisor Latch Low Byte */
 outportb(PORT1 + 1 , 0x00);  /* Set Baud rate - Divisor Latch High Byte */
 outportb(PORT1 + 3 , 0x03);  /* 8 Bits, No Parity, 1 Stop Bit */
 outportb(PORT1 + 2 , 0xC7);  /* FIFO Control Register */
 outportb(PORT1 + 4 , 0x0B);  /* Turn on DTR, RTS, and OUT2 */

 do { c = inportb(PORT1 + 5);          /* Check to see if char has been  received.                     */
       
 if (c & 1)
        {
        ch = inportb(PORT1); /* If so, then get Char          */
        printf("%x ",ch);
        }
      
        if (kbhit())
        {
      ch = getch();         /* If key pressed, get Char */

        } /* Send Char to Serial Port */

     } while (ch !=27); /* Quit when ESC (ASC 27) is pressed */
}

yeah i am using windows xp sp3
the program works with turbo v2 but not with turbo v4.5
someone told me the port addresses are different in turbo v4.5 but i don't know what....

Is the program you provided to run on your project board or the PC? If it is for you PC I suggest you consider the more modern Windows Serial API to control your serial port. Trying to use direct port access while using a modern Windows operating system is problematic. Here is a link to a document that describes how to use this API: Windows Serial Ports.

Jim