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tmk_keyboard_custom/keyboard/ghpad/backlight.c
2014-04-04 12:22:22 +09:00

83 lines
2.2 KiB
C

/*
Copyright 2013,2014 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
};
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));
}