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/*
* Notification LED
*
* Copyright (c) 2014 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "notify_led.h"
#include "main.h"
#include <avr/io.h>
#include <avr/eeprom.h>
#include <string.h>
#define NOTIFY_LED_DDR DDRD
#define NOTIFY_LED_PORT PORTD
#define NOTIFY_LED_BIT 4
#define PULSE_PAUSE_TIME msec_to_jiffies(50)
#define LONG_PAUSE_TIME msec_to_jiffies(3000)
struct notify_led {
bool state;
uint8_t count;
jiffies_t timer;
};
static struct notify_led led;
static uint8_t EEMEM eeprom_notify_led_state = 0;
void notify_led_set(bool on)
{
uint8_t sreg;
sreg = irq_disable_save();
if (led.state != on) {
led.count = 0;
led.state = on;
led.timer = jiffies_get() + PULSE_PAUSE_TIME;
if (on)
NOTIFY_LED_PORT |= (1 << NOTIFY_LED_BIT);
else
NOTIFY_LED_PORT &= ~(1 << NOTIFY_LED_BIT);
eeprom_update_byte(&eeprom_notify_led_state, on);
}
irq_restore(sreg);
}
bool notify_led_get(void)
{
return led.state;
}
void notify_led_work(void)
{
jiffies_t now = jiffies_get();
uint8_t sreg;
sreg = irq_disable_save();
if (led.state && !time_before(now, led.timer)) {
switch (led.count) {
default:
led.count = -1;
/* fallthrough */
case 0:
case 1:
case 2:
case 3:
led.count++;
led.timer = now + PULSE_PAUSE_TIME;
NOTIFY_LED_PORT ^= (1 << NOTIFY_LED_BIT);
break;
case 4:
led.count++;
led.timer = now + LONG_PAUSE_TIME;
NOTIFY_LED_PORT &= ~(1 << NOTIFY_LED_BIT);
break;
}
}
irq_restore(sreg);
}
void notify_led_init(void)
{
NOTIFY_LED_PORT &= ~(1 << NOTIFY_LED_BIT);
NOTIFY_LED_DDR |= (1 << NOTIFY_LED_BIT);
memset(&led, 0, sizeof(led));
led.state = eeprom_read_byte(&eeprom_notify_led_state);
}
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