How parallel port is used in turbo c?

Answer 1

Parallel port is the most simplest port of computer to use. It is too simple to use in Turbo C++ .

there are two types of parallel ports of computer

1. SPP (standard parallel port) = 0x3bc

2. ECP (Enhanced communication port) or EPP(Enhanced parallel port) = 0x378

parallel port is divided into three ports

1. DATA port = 0x3bc OR 0x378

2. control port = 0x3bd OR 0x379

3. status port = 0x3be OR 0x37a

data port is consists of 8 pins and use 8 bit binary code for controlling..

D7 D6 D5 D4 D3 D2 D1 D0

128 64 32 16 8 4 2 1

1 1 1 1 1 1 1 1 = 255..................send 255 int as data for binary all 1s

D7 D6 D5 D4 D3 D2 D1 D0

128 64 32 16 8 4 2 1

0 0 0 0 0 0 0 0 = 0..............send 0 int as data for binary all 0s

D7 D6 D5 D4 D3 D2 D1 D0

128 64 32 16 8 4 2 1

0 0 0 1 0 0 0 0 = 16............send 16 int as data for binary 1 in pin (D0)

D0= pin 2

D1= pin 3

D2= pin 4

D3= pin 5

D4= pin 6

D5= pin 7

D6= pin 8

D7= pin 9

outp(port,data); is the function use send data to the ports.

where ,

port is the integer value of port..... 0x378 or 0x3bc or 0x379 or 0x3bd or 0x37a or 0x3be.

data is an integer value to send ..ranges from 0 to 255

data=inp(port); is the function to receive input from port.

data is integer data .....0-255

port is the integer value of port..... 0x378 or 0x3bc or 0x379 or 0x3bd or 0x37a or 0x3be.

Example:

#include<stdio.h>

#include<conio.h>

#include<dos.h>

void main (void)

{

int data=0, portin=0x37a, portout=0x378;

//send 255 to port....using data pins.

data=255;

outp(portout,data);

//input from port using status pins...

data=inp(portin);

printf("\n%d",data);

getch();

}

In this way we control parallel port in turbo C++