83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
|
|
Copyright 2013,2014 Kai Ryu <kai1103@gmail.com>
|
|
|
|
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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <avr/io.h>
|
|
#include <avr/interrupt.h>
|
|
#include <avr/pgmspace.h>
|
|
#include "backlight.h"
|
|
|
|
static const uint8_t backlight_table[] PROGMEM = {
|
|
0, 16, 128, 255
|
|
};
|
|
|
|
uint8_t softpwm_ocr = 0;
|
|
|
|
/* Backlight pin configuration
|
|
* PWM: PB5 (RevRS)
|
|
* GPIO: PF7 PF6 PF5
|
|
*/
|
|
void backlight_set(uint8_t level)
|
|
{
|
|
if (level > 0) {
|
|
// Turn on PWM
|
|
cli();
|
|
// Hard PWM
|
|
DDRB |= (1<<PB5);
|
|
PORTB |= (1<<PB5);
|
|
TCCR1A |= ((1<<WGM10) | (1<<COM1A1));
|
|
TCCR1B |= ((1<<CS11) | (1<<CS10));
|
|
// Soft PWM
|
|
DDRF |= ((1<<PF7) | (1<<PF6) | (1<<PF5));
|
|
PORTF |= ((1<<PF7) | (1<<PF6) | (1<<PF5));
|
|
TIMSK1 |= ((1<<OCIE1A) | (1<<TOIE1));
|
|
TIFR1 |= (1<<TOV1);
|
|
sei();
|
|
// Set PWM
|
|
OCR1A = pgm_read_byte(&backlight_table[level]);
|
|
softpwm_ocr = pgm_read_byte(&backlight_table[level]);
|
|
}
|
|
else {
|
|
// Turn off PWM
|
|
cli();
|
|
// Hard PWM
|
|
DDRB |= (1<<PB5);
|
|
PORTB &= ~(1<<PB5);
|
|
TCCR1A &= ~((1<<WGM10) | (1<<COM1A1));
|
|
TCCR1B &= ~((1<<CS11) | (1<<CS10));
|
|
// Soft PWM
|
|
DDRF |= ((1<<PF7) | (1<<PF6) | (1<<PF5));
|
|
PORTF |= ((1<<PF7) | (1<<PF6) | (1<<PF5));
|
|
TIMSK1 |= ((1<<OCIE1A) | (1<<TOIE1));
|
|
TIFR1 |= (1<<TOV1);
|
|
sei();
|
|
// Set PWM
|
|
OCR1A = 0;
|
|
softpwm_ocr = 0;
|
|
}
|
|
}
|
|
|
|
ISR(TIMER1_COMPA_vect)
|
|
{
|
|
// LED off
|
|
PORTF |= ((1<<PF7) | (1<<PF6) | (1<<PF5));
|
|
}
|
|
ISR(TIMER1_OVF_vect)
|
|
{
|
|
// LED on
|
|
PORTF &= ~((1<<PF7) | (1<<PF6) | (1<<PF5));
|
|
}
|