Serial pot communication through c program
Dear experts ,
please help me i want to connect tp serial port and want to read the data from that , itried like this:
Code:
#include <dos.h>
#include <stdio.h>
#include <conio.h>
#define PORT1 0x3F8
/* Defines Serial Ports Base Address */
/* COM1 0x3F8 */
/* COM2 0x2F8 */
/* COM3 0x3E8 */
/* COM4 0x2E8 */
void main(void)
{
int c;
int ch;
outportb(PORT1 + 1 , 0); /* Turn off interrupts - Port1 */
/* PORT 1 - Communication Settings */
outportb(PORT1 + 3 , 0x80); /* 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); /* 8 Bits, No Parity, 1 Stop Bit */
outportb(PORT1 + 2 , 0xC7); /* FIFO Control Register */
outportb(PORT1 + 4 , 0x0B); /* 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. */
if (c & 1) {ch = inportb(PORT1); /* If so, then get Char */
printf("%c",ch);} /* Print Char to Screen */
/*%d
if (kbhit()){ch = getch(); /* If key pressed, get Char */
outportb(PORT1, ch);} /* Send Char to Serial Port */
}while (ch !=27); /* Quit when ESC (ASC 27) is pressed */
}
but i am not getting the desired results means no results only please help me
how to connect to COM1 serail port and how to check its output,
please help me
with regards,
vidya.
