toolchain/gcc/libgloss/m68k/leds.c

   1 /*
   2  * leds.c -- control the led's on a Motorola mc68ec0x0 board.
   3  *
   4  * Copyright (c) 1995 Cygnus Support
   5  *
   6  * The authors hereby grant permission to use, copy, modify, distribute,
   7  * and license this software and its documentation for any purpose, provided
   8  * that existing copyright notices are retained in all copies and that this
   9  * notice is included verbatim in any distributions. No written agreement,
  10  * license, or royalty fee is required for any of the authorized uses.
  11  * Modifications to this software may be copyrighted by their authors
  12  * and need not follow the licensing terms described here, provided that
  13  * the new terms are clearly indicated on the first page of each file where
  14  * they apply.
  15  */
  16 #include "leds.h"
  17
  18 /*
  19  * led_putnum -- print a hex number on the LED. the value of num must be a char with
  20  *              the ascii value. ie... number 0 is '0', a is 'a', ' ' (null) clears
  21  *              the led display.
  22  *              Setting the bit to 0 turns it on, 1 turns it off.
  23  *              the LED's are controlled by setting the right bit mask in the base
  24  *              address.
  25  *              The bits are:
  26  *                      [d.p | g | f | e | d | c | b | a ] is the byte.
  27  *
  28  *              The locations are:
  29  *
  30  *                       a
  31  *                     -----
  32  *                  f |     | b
  33  *                    |  g  |
  34  *                     -----
  35  *                    |     |
  36  *                  e |     | c
  37  *                     -----
  38  *                       d                . d.p (decimal point)
  39  */
  40 void
  41 led_putnum ( num )
  42 char num;
  43 {
  44     static unsigned char *leds = (unsigned char *)LED_ADDR;
  45     static unsigned char num_bits [18] = {
  46       0xff,                                             /* clear all */
  47       0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */
  48       0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe             /* letters a-f */
  49     };
  50
  51     if (num >= '0' && num <= '9')
  52       num = (num - '0') + 1;
  53
  54     if (num >= 'a' && num <= 'f')
  55       num = (num - 'a') + 12;
  56
  57     if (num == ' ')
  58       num = 0;
  59
  60     *leds = num_bits[num];
  61 }
  62
  63 /*
  64  * zylons -- draw a rotating pattern. NOTE: this function never returns.
  65  */
  66 void
  67 zylons()
  68 {
  69   unsigned char *leds   = (unsigned char *)LED_ADDR;
  70   unsigned char curled = 0xfe;
  71
  72   while (1)
  73     {
  74       *leds = curled;
  75       curled = (curled >> 1) | (curled << 7);
  76       delay ( 200 );
  77     }
  78 }