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- /*
- Copyright 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
- };
-
- /* Backlight pin configuration
- * PWM: PC6(OC3A)
- */
- void backlight_set(uint8_t level)
- {
- if (level > 0) {
- // Turn on PWM
- cli();
- DDRC |= (1<<PC6);
- //TCCR3A = 0b10101001;
- //TCCR3B = 0b00000011;
- TCCR3A |= ( (1<<WGM30) | (1<<COM3A1) | (1<<COM3B1) | (1<<COM3C1) );
- TCCR3B |= ( (1<<CS31) | (1<<CS30) );
- sei();
- // Set PWM
- OCR3A = pgm_read_byte(&backlight_table[level]);
- OCR3B = pgm_read_byte(&backlight_table[level]);
- }
- else {
- // Turn off PWM
- cli();
- DDRC &= ~(1<<PC6);
- //TCCR3A = 0b00000000;
- //TCCR3B = 0b00000000;
- TCCR3A &= ~( (1<<WGM30) | (1<<COM3A1) | (1<<COM3B1) | (1<<COM3C1) );
- TCCR3B &= ~( (1<<CS31) | (1<<CS30) );
- sei();
- // Set PWM
- OCR3A = 0;
- OCR3B = 0;
- }
- }
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