mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-04 13:06:01 +00:00
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
|
|
* 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 );
|
|
}
|
|
}
|