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tmk_keyboard_custom/keyboard/lr96/backlight.c

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2014-02-28 10:02:38 +00:00
/*
Copyright 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
};
/* Backlight pin configuration
* PWM: PC6(OC3A)
*/
void backlight_set(uint8_t level)
{
if (level > 0) {
// Turn on PWM
cli();
DDRC |= (1<<PC6);
TCCR3A |= ( (1<<WGM30) | (1<<COM3A1) );
TCCR3B |= ( (1<<CS31) | (1<<CS30) );
sei();
// Set PWM
OCR3A = pgm_read_byte(&backlight_table[level]);
}
else {
// Turn off PWM
cli();
DDRC &= ~(1<<PC6);
TCCR3A &= ~( (1<<WGM30) | (1<<COM3A1) );
TCCR3B &= ~( (1<<CS31) | (1<<CS30) );
sei();
// Set PWM
OCR3A = 0;
}
}