FULL DUPLEX COMMUNICATION USING RS-232 IN C (CHARACTER PASSING)

FULL DUPLEX COMMUNICATION USING RS-232 IN C (CHARACTER PASSING)

CHARACTER TRANSMITTER-RECEIVER

#include<stdio.h>

#include<conio.h>

#include<bios.h>

#include<process.h>

#define COM1 0

#define COM2 0

#define COM1ADDR 0x3F8

#define DATA_READY 0x100

#define TRANS_READY 0x2000

void main()

{

int ch;

printf("enter your choice");

printf("\n 1:transmit \n 2:receive");

switch(ch)

{

case 1:

{

transfer();

break;

                                                             }

case 2:

{

receive();

break;

             }

                                                 }

             }

transfer()

{

                                               char ch,ch1,tfile;

                                               int status,choice;

char setting,baud = 0xe0,parity = 0x08,data = 0x04,stop = 0x03;

setting = baud | parity | data | stop;

clrscr();

bioscom(0,setting,COM1);

while(1)

{

clrscr();

printf("\n           SERIAL COMMUNICATION USING RS-232 PROTOCOLS\n");

printf(" 1: Char Transsmission...\t  2:Exit....\n");

printf("\n                       Enter Choice :\n");

scanf("%d",&ch);

switch(choice)

{

                                                                       case 1:

do

{

ch=getch();

if(ch==0x0d)

printf("\n");

printf("%c",ch);

output(0x3f8,ch);

}

while(ch!=0x1b);

break;

case 2:exit(0);

}

}

}

receive()

{

char ch,ch1;

int status,choice;

char setting,baud = 0xe0,parity = 0x08,data = 0x04,stop = 0x03;

setting = baud | parity | data | stop;

clrscr();

bioscom(0,setting,COM2);

while(1)

{

clrscr();

printf("\n           SERIAL COMMUNICATION USING RS-232 PROTOCOLS\n");

printf("\n 1: Char Receive...\t  2:Exit....\n");

printf("\n                       Enter Choice :\n");

scanf("%d",&ch1);

switch(choice)

                                                                        {

                                                                       case 1:

do

{

status=bioscom(3,0,COM2);

if(status & DATA_READY)

{

ch1 = inport(0x2F8);   if(ch1==0x0d)

printf("\n");

if(ch1==0x1b)

break;

printf(" %c",ch1);

}

}

while(ch1!=0x1d);

break;

case 2: exit(0);

}

}

}