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/* op50nled.c -- fucntions that manipulate the LEDs.

 *

 * Copyright (c) 1995 Cygnus Support

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include "op50n.h"

void zylons();

void strobe();

void led_putnum();

void delay();

/*

 * led_putnum -- print a hex number on the LED. the value of num must be a byte.

 *               The max number 15, since the front panel only has 4 LEDs.

 */

void

led_putnum ( num )

char num;

{

    static unsigned char *leds = (unsigned char *)LED_ADDR;

/**    *leds = (num << 4); **/

    *leds = num;

}

/*

 * strobe -- do a zylons thing, toggling each led in sequence forever...

 */

void

zylons()

{

  while (1) {

    strobe();

  }

}

/*

 * strobe -- toggle each led in sequence up and back once.

 */

void

strobe()

{

  static unsigned char curled;

  static unsigned char dir;

  curled = 1;

  dir = 0;

  while (curled != 0) {

    led_putnum (curled);

    delay (70000);

    if (dir)

      curled >>= 1;

    else

      curled <<= 1;

    if (curled == 0x100) {

      dir = ~dir;

    }

  }

  curled = 1;

  dir = 0;

}

void

delay (x)

     int x;

{

  int  y = 17;

  while (x-- !=0)

    y = y^2;

}