95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* Copyright 2017 Sebastian Kaim
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef BACKLIGHT_ENABLE
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#include "backlight_ps2avrGB.h"
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#define sbi(reg,bit) reg |= (_BV(bit))
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#define cbi(reg,bit) reg &= (~_BV(bit))
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#define PWM10 WGM10
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#define PWM11 WGM11
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#define COM1x1 COM1B1
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#define OCR1x OCR1B
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void backlight_init_ports(void)
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{
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#if BACKLIGHT_ON_STATE == 0
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backlight_off();
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#else
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backlight_on();
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#endif
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// setup pwm
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// this bitmagic is sourced from the original firmware
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/*TCCR1B = ((TCCR1B & ~0x07) | 0x03);
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TCNT1H = 0;
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TCNT1L = 0;
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sbi(TIMSK, TOIE1);
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OCR1BH = 0;
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OCR1BL = 0;
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cbi(TCCR1A,PWM11);
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sbi(TCCR1A,PWM10);
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sbi(TCCR1A,COM1B1);
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cbi(TCCR1A,COM1B0);*/
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ICR1 = 0xFFFF;
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TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
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backlight_init();
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}
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void backlight_set(uint8_t level)
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{
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if( level == 0 ) {
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backlight_off();
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}
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else {
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backlight_on();
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/*uint8_t pwm = get_pwm_for_brightness(level);
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set_backlight_pwm(pwm);
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TCCR1A |= _BV(COM1x1);
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OCR1x = (level >= 2) ? 0xFFFF : 0x00FF;*/
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}
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}
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#define PWM_MAX 0xFF
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uint8_t get_pwm_for_brightness(uint8_t level)
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{
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// we need to cast up here to allow multiplication with 0xFF. We could also use floats, but this is probably a lot faster.
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uint16_t brightness = (uint16_t)level * (uint16_t)PWM_MAX / (uint16_t)BACKLIGHT_LEVELS;
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return (uint8_t)brightness;
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}
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void backlight_on(void)
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{
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//_SFR_IO8(0x12) |= _BV(0x4);
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LED_PIN |= BACKLIGHT_PORT_NUM;
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}
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void backlight_off(void)
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{
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//_SFR_IO8(0x12) &= ~_BV(0x4);
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LED_PIN &= ~BACKLIGHT_PORT_NUM;
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}
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void set_backlight_pwm(uint8_t level) {
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// this does not work (yet)
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//OCR1B = level;
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}
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#endif // BACKLIGHT_ENABLE
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