97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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Copyright 2013,2014 Kai Ryu <kai1103@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "backlight.h"
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static const uint8_t backlight_table[] PROGMEM = {
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0, 16, 128, 255
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};
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/* Backlight pin configuration
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* PWM: PB7
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*/
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void backlight_enable(void)
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{
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#if defined(GH60_REV_CHN)
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// Turn on PWM
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cli();
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DDRB |= (1<<PB6);
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TCCR1A |= ( (1<<WGM10) | (1<<COM1B1) );
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TCCR1B |= ( (1<<CS11) | (1<<CS10) );
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sei();
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#else
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DDRF |= (1<<PF7 | 1<<PF6 | 1<<PF5 | 1<<PF4);
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PORTF |= (1<<PF7 | 1<<PF6 | 1<<PF5 | 1<<PF4);
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cli();
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TCCR1A |= (1<<WGM10);
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TCCR1B |= ((1<<CS11) | (1<<CS10));
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TIMSK1 |= ((1<<OCIE1A) | (1<<TOIE1));
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TIFR1 |= (1<<TOV1);
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sei();
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#endif
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}
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void backlight_disable(void)
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{
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#if defined(GH60_REV_CHN)
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// Turn off PWM
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cli();
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DDRB &= ~(1<<PB6);
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TCCR1A &= ~( (1<<WGM10) | (1<<COM1B1) );
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TCCR1B &= ~( (1<<CS11) | (1<<CS10) );
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sei();
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OCR1A = 0;
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#else
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DDRF &= ~(1<<PF7 | 1<<PF6 | 1<<PF5 | 1<<PF4);
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cli();
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TCCR1A &= ~(1<<WGM10);
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TCCR1B &= ~((1<<CS11) | (1<<CS10));
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TIMSK1 |= ((1<<OCIE1A) | (1<<TOIE1));
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TIFR1 |= (1<<TOV1);
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sei();
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OCR1A = 0;
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#endif
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}
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void backlight_set(uint8_t level)
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{
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if (level > 0) {
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backlight_set_raw(pgm_read_byte(&backlight_table[level]));
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}
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}
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void backlight_set_raw(uint8_t raw)
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{
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OCR1A = raw;
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}
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#ifndef GH60_REV_CHN
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ISR(TIMER1_COMPA_vect)
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{
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// LED off
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PORTF |= (1<<PF7 | 1<<PF6 | 1<<PF5 | 1<<PF4);
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}
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ISR(TIMER1_OVF_vect)
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{
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// LED on
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PORTF &= ~(1<<PF7 | 1<<PF6 | 1<<PF5 | 1<<PF4);
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}
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#endif
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