#include <stdio.h>
#include <dos.h>
#include <conio.h>

#define  ADDRESS    (0x350)     /* The Base address of the watchdog board. */

typedef unsigned int uint;

void CtrMode(uint addr, char cntr, char mode)
{
  int ctrl;
  ctrl = (cntr << 6) | 0x30 | (mode << 1);
  outportb(addr+3,ctrl);
}

void CtrLoad(uint addr ,int c,int val)
{
  outportb(addr+c,val & 0x00FF);
  outportb(addr+c,(val>>8) & 0x00FF);
}

/*
******************************************************************************
FUNCTION set_counter()
Purpose: This function performs the setup operations on the 82C54 counter/
	 timer chip.
******************************************************************************
*/
void set_counter(void)
{
  CtrMode(ADDRESS, 0, 3); // set counter 0 to mode 3
  CtrLoad(ADDRESS, 0, 0xFFFF); // load counter 0 with full scale

  CtrMode(ADDRESS, 1, 2); // set counter 1 to mode 2
  CtrLoad(ADDRESS, 1, 0x0010); // load counter 1 with 10 hex

  CtrMode(ADDRESS, 2, 1); // set counter 2 to mode 1

} /* End set_counter() */


/*
******************************************************************************
FUNCTION main()
Purpose: This function controls program flow, making calls to the other
	 functions, and prompting for user input.
******************************************************************************
*/

void main()
{
  unsigned read_back, out_byte;
  int aborted = 0;

  clrscr();
  puts("C Sample #1: Use Of Counter/Timer Chip with Watchdog");
  puts("This program demonstrates how to program the 82C54 counter/timer");
  puts("chip on the Watchdog Timer board.  The Watchdog address should be set");
  puts("to 350 hex.  A keystroke will stop the program.");
  puts("");
  puts("Press any key to start.");
  getch();                              /* Grab keystroke. Discard it. */

  inp(ADDRESS + 7);  /* Disable counters */

  set_counter();                        /* Set counter and start the
					   countdown. */

  outp(ADDRESS+7, 0);   /* Enable counters */

  for (read_back = 0; read_back <=1000; read_back++) {
    CtrMode(ADDRESS, 1, 2); // set counter 1 to mode 2
    CtrLoad(ADDRESS, 1, 0x0010); // load counter 1 with 10 hex
    printf("Updating counter 1.  Loop number : %hu", read_back);
    gotoxy(1, 7);
  }

  puts("\nWaiting for timeout . . .");

  do {
     aborted = kbhit();
  } while ((inp(ADDRESS+4) & 1 != 0) && !(aborted));  /* Check bit 0 of
							   control register */

  puts("");
  if (aborted) puts("Timeout aborted!"); else
     puts("Watchdog timed out successfully.");
}