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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [libgloss/] [pa/] [op50nled.c] - Blame information for rev 148

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1 148 jeremybenn
/* 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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