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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"
- #include "breathing_led.h"
-
- static const uint8_t backlight_table[] PROGMEM = {
- 0, 16, 128, 255
- };
-
- inline void backlight_set_raw(uint8_t raw);
-
- /* Backlight pin configuration
- * PWM: PC6(OC3A)
- */
- void backlight_enable(void)
- {
- // Turn on PWM
- cli();
- DDRC |= (1<<PC6);
- TCCR3A |= ( (1<<WGM10) | (1<<COM3A1) );
- TCCR3B |= ( (1<<CS31) | (1<<CS30) );
- sei();
- }
- void backlight_disable(void)
- {
- // Turn off PWM
- cli();
- DDRC &= ~(1<<PC6);
- TCCR3A &= ~( (1<<WGM10) | (1<<COM3A1) );
- TCCR3B &= ~( (1<<CS31) | (1<<CS30) );
- sei();
- }
-
- void backlight_set(uint8_t level)
- {
- #ifdef BREATHING_LED_ENABLE
- switch (level) {
- case 1:
- case 2:
- case 3:
- backlight_enable();
- breathing_led_disable();
- backlight_set_raw(pgm_read_byte(&backlight_table[level]));
- break;
- case 4:
- case 5:
- case 6:
- backlight_enable();
- breathing_led_enable();
- breathing_led_set_duration(6 - level);
- break;
- case 0:
- default:
- breathing_led_disable();
- backlight_disable();
- break;
- }
- #else
- if (level > 0) {
- backlight_enable();
- backlight_set_raw(pgm_read_byte(&backlight_table[level]));
- }
- else {
- backlight_disable();
- }
- #endif
- }
-
- #ifdef BREATHING_LED_ENABLE
- void breathing_led_set_raw(uint8_t raw)
- {
- backlight_set_raw(raw);
- }
- #endif
-
- inline void backlight_set_raw(uint8_t raw)
- {
- OCR3A = raw;
- }
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