88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "backlight.h"
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#include "backlight-target.h"
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#include "lcd.h"
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#include "pwm-x1000.h"
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#define BL_LCD_CHN 0
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#define BL_LCD_PERIOD 33000
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#define BL_BTN_CHN 4
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#define BL_BTN_PERIOD 100000
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static int backlight_calc_duty(int period, int min_duty, int brightness)
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{
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return min_duty + (period - min_duty) * brightness / MAX_BRIGHTNESS_SETTING;
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}
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bool backlight_hw_init(void)
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{
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pwm_init(BL_LCD_CHN);
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pwm_init(BL_BTN_CHN);
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pwm_enable(BL_LCD_CHN);
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pwm_enable(BL_BTN_CHN);
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backlight_hw_brightness(MAX_BRIGHTNESS_SETTING);
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buttonlight_hw_brightness(MAX_BRIGHTNESS_SETTING);
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/* TODO: avoid buttonlight flicker when powering up the machine */
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return true;
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}
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void backlight_hw_on(void)
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{
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pwm_enable(BL_LCD_CHN);
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#ifdef HAVE_LCD_ENABLE
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lcd_enable(true);
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#endif
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}
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void backlight_hw_off(void)
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{
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pwm_disable(BL_LCD_CHN);
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#ifdef HAVE_LCD_ENABLE
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lcd_enable(false);
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#endif
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}
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void backlight_hw_brightness(int brightness)
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{
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int duty_ns = backlight_calc_duty(BL_LCD_PERIOD, 0, brightness);
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pwm_set_period(BL_LCD_CHN, BL_LCD_PERIOD, duty_ns);
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}
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void buttonlight_hw_on(void)
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{
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pwm_enable(BL_BTN_CHN);
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}
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void buttonlight_hw_off(void)
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{
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pwm_disable(BL_BTN_CHN);
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}
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void buttonlight_hw_brightness(int brightness)
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{
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/* Duty cycle below 11% seems to turn the buttonlight off entirely,
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* so we need to rescale the range */
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int duty_ns = backlight_calc_duty(BL_BTN_PERIOD, BL_BTN_PERIOD*11/100, brightness);
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pwm_set_period(BL_BTN_CHN, BL_BTN_PERIOD, duty_ns);
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}
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