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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [libgloss/] [m68k/] [leds.c] - Blame information for rev 148

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1 148 jeremybenn
/*
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 * leds.c -- control the led's on a Motorola mc68ec0x0 board.
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 *
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 * Copyright (c) 1995 Cygnus Support
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 *
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 * The authors hereby grant permission to use, copy, modify, distribute,
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 * and license this software and its documentation for any purpose, provided
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 * that existing copyright notices are retained in all copies and that this
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 * notice is included verbatim in any distributions. No written agreement,
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 * license, or royalty fee is required for any of the authorized uses.
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 * Modifications to this software may be copyrighted by their authors
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 * and need not follow the licensing terms described here, provided that
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 * the new terms are clearly indicated on the first page of each file where
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 * they apply.
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 */
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#include "leds.h"
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/*
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 * led_putnum -- print a hex number on the LED. the value of num must be a char with
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 *              the ascii value. ie... number 0 is '0', a is 'a', ' ' (null) clears
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 *              the led display.
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 *              Setting the bit to 0 turns it on, 1 turns it off.
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 *              the LED's are controlled by setting the right bit mask in the base
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 *              address.
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 *              The bits are:
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 *                      [d.p | g | f | e | d | c | b | a ] is the byte.
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 *
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 *              The locations are:
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 *
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 *                       a
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 *                     -----
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 *                  f |     | b
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 *                    |  g  |
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 *                     -----
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 *                    |     |
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 *                  e |     | c
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 *                     -----
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 *                       d                . d.p (decimal point)
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 */
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void
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led_putnum ( num )
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char num;
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{
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    static unsigned char *leds = (unsigned char *)LED_ADDR;
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    static unsigned char num_bits [18] = {
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      0xff,                                             /* clear all */
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      0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */
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      0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe             /* letters a-f */
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    };
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    if (num >= '0' && num <= '9')
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      num = (num - '0') + 1;
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    if (num >= 'a' && num <= 'f')
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      num = (num - 'a') + 12;
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    if (num == ' ')
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      num = 0;
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    *leds = num_bits[num];
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}
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/*
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 * zylons -- draw a rotating pattern. NOTE: this function never returns.
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 */
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void
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zylons()
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{
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  unsigned char *leds   = (unsigned char *)LED_ADDR;
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  unsigned char curled = 0xfe;
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  while (1)
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    {
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      *leds = curled;
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      curled = (curled >> 1) | (curled << 7);
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      delay ( 200 );
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    }
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}

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