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

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

FILE TRANSMITTER-RECEIVER

#include<stdio.h>

#include<io.h>

#include<dos.h>

#include<conio.h>

#include<bios.h>

#define COM1 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 tfile;

            int status,counter=0;

            char ch;

            long size;

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

            FILE *fpt;

            setting = baud | parity | data | stop;

            clrscr();

            bioscom(0,setting,COM1);

            printf("enetr filename to transfer:");

            scanf("%s",tfile);

            fpt = fopen("c:\\TC\\1.txt" ,"r");

            if(fpt == NULL)

            printf("\n\tFile Not Found.....\n");

            else

            {

                        fseek(fpt,0,SEEK_END);

                        size = ftell(fpt);

                        printf("\n\tFile size is %ld",size);

                        rewind(fpt);

                        printf("\n\tFile is being transferred\n\tWait...\n");

                        while(!feof(fpt))

                        {

                                    status=bioscom(3,0,COM1);

                                    if(status & TRANS_READY)

                                    {

                                                ch=fgetc(fpt);

                                                outport(COM1ADDR,ch);

                                                counter++;

                                                                                    gotoxy(20,20);

                                                                                    printf("%d Bytes has been transfered",counter);

                                                                        }

                                                            }

                                                            outport(COM1ADDR,0x1b);

                                                            printf("\n\tFile transferred successfully");

                                                            getch();

                                                }

                        }

                       receive()

                       {

                                   char ch1,rfile;

                                   int status;

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

                                   FILE *fpr;

                                   setting = baud | parity | data | stop;

                                   clrscr();

                                   printf("\n enter file to receive");

                                   scanf("%s",rfile);

                                   fpr=fopen(rflie,"w");

                                   if(fpr==NULL)

                                   printf("\n\t Error... File cannot be opened:");

                                   else

                                   {

                                               bioscom(0,setting,COM1);

                                               while(1)

                                               {

                                                           status=bioscom(3,0,COM1);

                                                           if(status & DATA_READY)

                                                           {

                                                                       ch1=inport(COM1ADDR);

                                                                       fputc(ch1,fpr);

                                                                       if(ch1==0x1b)

                                                                       {

                                                                                   break;

                                                                                   printf("%c",ch1);

                                                                       }

                                                           }

                                               }

                                   }

                       }