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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "backlight.h"
#include "backlight-target.h"
#include "lcd.h"
#include "pwm-x1000.h"
#define BL_LCD_CHN 0
#define BL_LCD_PERIOD 33000
#define BL_BTN_CHN 4
#define BL_BTN_PERIOD 100000
static int backlight_calc_duty(int period, int min_duty, int brightness)
{
return min_duty + (period - min_duty) * brightness / MAX_BRIGHTNESS_SETTING;
}
bool backlight_hw_init(void)
{
pwm_init(BL_LCD_CHN);
pwm_init(BL_BTN_CHN);
pwm_enable(BL_LCD_CHN);
pwm_enable(BL_BTN_CHN);
backlight_hw_brightness(MAX_BRIGHTNESS_SETTING);
buttonlight_hw_brightness(MAX_BRIGHTNESS_SETTING);
return true;
}
void backlight_hw_on(void)
{
pwm_enable(BL_LCD_CHN);
#ifdef HAVE_LCD_ENABLE
lcd_enable(true);
#endif
}
void backlight_hw_off(void)
{
pwm_disable(BL_LCD_CHN);
#ifdef HAVE_LCD_ENABLE
lcd_enable(false);
#endif
}
void backlight_hw_brightness(int brightness)
{
int duty_ns = backlight_calc_duty(BL_LCD_PERIOD, 0, brightness);
pwm_set_period(BL_LCD_CHN, BL_LCD_PERIOD, duty_ns);
}
void buttonlight_hw_on(void)
{
pwm_enable(BL_BTN_CHN);
}
void buttonlight_hw_off(void)
{
pwm_disable(BL_BTN_CHN);
}
void buttonlight_hw_brightness(int brightness)
{
/* Duty cycle below 11% seems to turn the buttonlight off entirely,
* so we need to rescale the range */
int duty_ns = backlight_calc_duty(BL_BTN_PERIOD, BL_BTN_PERIOD*11/100, brightness);
pwm_set_period(BL_BTN_CHN, BL_BTN_PERIOD, duty_ns);
}
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