82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
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/* op50nled.c -- fucntions that manipulate the LEDs.
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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 "op50n.h"
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void zylons();
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void strobe();
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void led_putnum();
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void delay();
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/*
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* led_putnum -- print a hex number on the LED. the value of num must be a byte.
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* The max number 15, since the front panel only has 4 LEDs.
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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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/** *leds = (num << 4); **/
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*leds = num;
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}
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/*
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* strobe -- do a zylons thing, toggling each led in sequence forever...
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*/
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void
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zylons()
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{
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while (1) {
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strobe();
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}
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}
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/*
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* strobe -- toggle each led in sequence up and back once.
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*/
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void
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strobe()
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{
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static unsigned char curled;
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static unsigned char dir;
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curled = 1;
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dir = 0;
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while (curled != 0) {
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led_putnum (curled);
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delay (70000);
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if (dir)
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curled >>= 1;
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else
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curled <<= 1;
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if (curled == 0x100) {
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dir = ~dir;
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}
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}
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curled = 1;
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dir = 0;
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}
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void
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delay (x)
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int x;
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{
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int y = 17;
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while (x-- !=0)
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y = y^2;
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}
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