/***********
 *
 *  lptwait2.c monitors the lpt1 port and waits for a change
 *
 *  Short between ground (db25 #18-25 or centronics #19-30
 *  and:
 *      #10 NACK
 *      #11 BUSY
 *      #12 Paper Out
 *      #13 SELECT
 *      #15/32 ERROR
 */

#include <dos.h>   /* Contains the prototype for inportb */
#include <stdio.h> /* Contains the prototype for printf */
#include <time.h>


int main(void)
{
 long int li_iterations;

 int a,old;
 uclock_t start;

 printf("\
# lptwait2.c - monitors a PCs lpt1 \n\
#  Dave Forrest drf5n@virginia.edu 1/11/98\n\
#  compiled with GNU's gcc\n\
#  source available at http://mug.sys.virginia.edu/~drf5n/extras\n\
#  See also http://www.geocities.com/SiliconValley/Bay/8302/parallel.htm\n\
#      or http://www.senet.com.au/~cpeacock/pdebug.htm\n\
#  for help\n\
#  try Centronics printer cable pin #19 with 10,11,12,13, or 32 \n\
#   or DB-25 pin 18 with 10,11,12,13, or 15\n\
");
 old = inportb(0x378 + 1); /* Gets input from Status Port in byte form. */
 printf("# lpt1 port status (0x378+1): %d \n",old); /* Prints byte value to screen in */
    start = uclock();
    while( a=inportb(0x378+1), a == old) {
     ;
    }
    printf ("%lf secs > %d (+-%lf)\n",
           (double)uclock()/(double)UCLOCKS_PER_SEC,a, 1/(double)UCLOCKS_PER_SEC);
    return 0;
}