nes-proj/core/dev/leds.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: leds.c,v 1.1 2006/06/17 22:41:16 adamdunkels Exp $
*/
#include "dev/leds.h"
#include "sys/clock.h"
static struct {
char green:4, yellow:4, red:4;
} leds;
static struct {
char green:2, yellow:2, red:2; /* These bit fields should really be
only one bit wide, but that
crashed gcc... */
} invert;
/*---------------------------------------------------------------------------*/
static void
show_leds(void)
{
leds_arch_set((((leds.green > 0) ^ invert.green) ? LEDS_GREEN : 0) |
(((leds.yellow > 0) ^ invert.yellow) ? LEDS_YELLOW : 0) |
(((leds.red > 0) ^ invert.red) ? LEDS_RED : 0));
}
/*---------------------------------------------------------------------------*/
void
leds_init(void)
{
leds.green = leds.red = leds.yellow = 0;
invert.green = invert.red = invert.yellow = 0;
leds_arch_init();
show_leds();
}
/*---------------------------------------------------------------------------*/
void
leds_blink(void)
{
/* Blink all leds. */
leds_arch_set(LEDS_ALL);
clock_delay(400);
show_leds();
}
/*---------------------------------------------------------------------------*/
unsigned char
leds_get(void) {
return leds_arch_get();
}
/*---------------------------------------------------------------------------*/
void
leds_on(unsigned char l)
{
if((l & LEDS_GREEN) && leds.green < 15) {
++leds.green;
}
if((l & LEDS_YELLOW) && leds.yellow < 15) {
++leds.yellow;
}
if((l & LEDS_RED) && leds.red < 15) {
++leds.red;
}
show_leds();
}
/*---------------------------------------------------------------------------*/
void
leds_off(unsigned char l)
{
if((l & LEDS_GREEN) && leds.green > 0) {
--leds.green;
}
if((l & LEDS_YELLOW) && leds.yellow > 0) {
--leds.yellow;
}
if((l & LEDS_RED) && leds.red > 0) {
--leds.red;
}
show_leds();
}
/*---------------------------------------------------------------------------*/
void
leds_toggle(unsigned char leds)
{
leds_invert(leds);
}
/* invert the <20>nvert register using the leds parameter */
void leds_invert(unsigned char l) {
if(l & LEDS_GREEN) {
invert.green = 1 - invert.green;
}
if(l & LEDS_YELLOW) {
invert.yellow = 1 - invert.yellow;
}
if(l & LEDS_RED) {
invert.red = 1 - invert.red;
}
show_leds();
}
/*---------------------------------------------------------------------------*/
void leds_green(int o) { o?leds_on(LEDS_GREEN):leds_off(LEDS_GREEN); }
void leds_yellow(int o) { o?leds_on(LEDS_YELLOW):leds_off(LEDS_YELLOW); }
void leds_red(int o) { o?leds_on(LEDS_RED):leds_off(LEDS_RED); }