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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;
}
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