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- /*
- Copyright 2013,2014 Kai Ryu <[email protected]>
-
- 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));
- }
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