62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
//backlight.cpp
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#include "backlight.h"
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#include <avr/eeprom.h>
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#include <Arduino.h>
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#include "eeprom.h"
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#include "Marlin.h"
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#include "pins.h"
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#include "fastio.h"
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#include "Timer.h"
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// #include "Configuration.h"
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#ifdef LCD_BL_PIN
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int16_t backlightLevel = 0;
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int16_t backlightLevel_old = 0;
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unsigned long backlightTimer_period = 10000ul;
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bool backlightIsDimmed = true;
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LongTimer backlightTimer;
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static void backlightDim()
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{
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// if (backlightIsDimmed) return;
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backlightLevel /= 4; //make the display half as bright.
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backlightIsDimmed = true;
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}
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static void backlightWake()
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{
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// if (!backlightIsDimmed) return;
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backlightLevel = eeprom_read_byte((uint8_t *)EEPROM_BACKLIGHT_LEVEL);
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backlightIsDimmed = false;
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}
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void backlightTimer_reset() //used for resetting the timer and waking the display
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{
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backlightTimer.start();
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if (backlightIsDimmed) backlightWake();
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}
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void backlight_update()
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{
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if (backlightTimer.expired(backlightTimer_period)) backlightDim();
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if (backlightLevel != backlightLevel_old) //update pwm duty cycle
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{
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analogWrite(LCD_BL_PIN, backlightLevel);
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backlightLevel_old = backlightLevel;
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if (!backlightIsDimmed) eeprom_update_byte((uint8_t *)EEPROM_BACKLIGHT_LEVEL, backlightLevel); //update eeprom value
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}
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}
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void backlight_init()
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{
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SET_OUTPUT(LCD_BL_PIN);
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WRITE(LCD_BL_PIN,0);
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backlightTimer_reset(); //initializes eeprom data and starts backlightTimer
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backlight_update(); //actually sets the backlight to the correct level
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}
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#endif //LCD_BL_PIN
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