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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [m68k/] [leds.c] - Rev 318
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/* * leds.c -- control the led's on a Motorola mc68ec0x0 board. * * 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 "leds.h" /* * led_putnum -- print a hex number on the LED. the value of num must be a char with * the ascii value. ie... number 0 is '0', a is 'a', ' ' (null) clears * the led display. * Setting the bit to 0 turns it on, 1 turns it off. * the LED's are controlled by setting the right bit mask in the base * address. * The bits are: * [d.p | g | f | e | d | c | b | a ] is the byte. * * The locations are: * * a * ----- * f | | b * | g | * ----- * | | * e | | c * ----- * d . d.p (decimal point) */ void led_putnum ( num ) char num; { static unsigned char *leds = (unsigned char *)LED_ADDR; static unsigned char num_bits [18] = { 0xff, /* clear all */ 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */ 0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe /* letters a-f */ }; if (num >= '0' && num <= '9') num = (num - '0') + 1; if (num >= 'a' && num <= 'f') num = (num - 'a') + 12; if (num == ' ') num = 0; *leds = num_bits[num]; } /* * zylons -- draw a rotating pattern. NOTE: this function never returns. */ void zylons() { unsigned char *leds = (unsigned char *)LED_ADDR; unsigned char curled = 0xfe; while (1) { *leds = curled; curled = (curled >> 1) | (curled << 7); delay ( 200 ); } }
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