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/*

 * leds.c -- control the led's on a Motorola mc68ec0x0 board.

 *

 * 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 "leds.h"

void zylons();

void led_putnum();

/*

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

 *              the ascii value. ie... number 0 is '0', a is 'a', ' ' (null) clears

 *              the led display.

 *              Setting the bit to 0 turns it on, 1 turns it off.

 *              the LED's are controlled by setting the right bit mask in the base

 *              address.

 *              The bits are:

 *                      [d.p | g | f | e | d | c | b | a ] is the byte.

 *

 *              The locations are:

 *

 *                       a

 *                     -----

 *                  f |     | b

 *                    |  g  |

 *                     -----

 *                    |     |

 *                  e |     | c

 *                     -----

 *                       d                . d.p (decimal point)

 */

void

led_putnum ( num )

char num;

{

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

    static unsigned char num_bits [18] = {

      0xff,                                             /* clear all */

      0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */

      0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe             /* letters a-f */

    };

    if (num >= '0' && num <= '9')

      num = (num - '0') + 1;

    if (num >= 'a' && num <= 'f')

      num = (num - 'a') + 12;

    if (num == ' ')

      num = 0;

    *leds = num_bits[num];

}

/*

 * zylons -- draw a rotating pattern. NOTE: this function never returns.

 */

void

zylons()

{

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

  unsigned char curled = 0xfe;

  while (1)

    {

      *leds = curled;

      curled = (curled >> 1) | (curled << 7);

      delay ( 200 );

    }

}