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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [pa/] [op50nled.c] - Rev 455
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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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