dominic

Hi,
kindly show me how to modify the code below so that it takes its input from a user specifeied file (prompted by the program) and the data also read from the port is also taken to another filename provided by the user. I a have written this program to assist me send data to a stream cipher circuitry connected to the PC's parallel port at address 0x378 (IOBASE).

SOFTWARE DESIGN.

/* *******************************************************/
/*This program is intended to WRITE and READ data to and from the SPP port */

/*Author: Mr. Dominic. */

/*Date: 8-12 Feb. 2005.
/*Reference: www.bibinjohn.tk . */

/******************************************************************/
#include <stdio.h> /* required so as to access the filesystem*/
#include <dos.h>
#include <time.h>
#define DATA 0x378 /*Data Register base address*/
#define STATUS DATA+1 /* Status Register address*/
#define CONTROL DATA+2 /*Control Register address*/

main()
{
char s;
char c;
c='A';


outport(CONTROL,inportb(CONTROL)&0xF0|0x04); /*initialise the
CONTROL port for data input*/

outportb(DATA, c); /*write c to the DATA register*/

s=(inportb(STATUS)&0xF0); /* read MSnibble*/

s=s|(inportb(CONTROL)&0x0F);/*Read LSnibble*/

s=s^0x84; /*toggle bit 2 and 7 */
/*pins 11 and 14 are hardware inverted*/

printf("character: %c becomes: %c\n", c,s);

return (0);

}

Lance

You wrote all that, yet you don't know how to use the scanf() function? Perplexing...

Anyways, go and read 'man 3 scanf' or this online article:

http://www.cs.ntu.edu.au/sit/resourc...gram/c_016.htm

Or just use google: 'scanf input c' or some other query.

Pretty straightforward, eh? :p

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