deskthority

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    /*
    Copyright 2013 Mathias Andersson <wraul@dbox.se>

    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 "backlight.h"
    #include "eeconfig.h"
    #include "debug.h"

    backlight_config_t backlight_config;

    void backlight_init(void)
    {
        //check signature
        if (!eeconfig_is_enabled()) {
            eeconfig_init();
        }
        backlight_config.raw = eeconfig_read_backlight();
        backlight_set(backlight_config.enable ? backlight_config.level : 0);
    }

    void backlight_increase(void)
    {
        if(backlight_config.level < BACKLIGHT_LEVELS)
        {
            backlight_config.level++;
            backlight_config.enable = 1;
            eeconfig_write_backlight(backlight_config.raw);
        }
        dprintf("backlight increase: %u\n", backlight_config.level);
        backlight_set(backlight_config.level);
    }

    void backlight_decrease(void)
    {
        if(backlight_config.level > 0)
        {
            backlight_config.level--;
            backlight_config.enable = !!backlight_config.level;
            eeconfig_write_backlight(backlight_config.raw);
        }
        dprintf("backlight decrease: %u\n", backlight_config.level);
        backlight_set(backlight_config.level);
    }

    void backlight_toggle(void)
    {
        backlight_config.enable ^= 1;
        eeconfig_write_backlight(backlight_config.raw);
        dprintf("backlight toggle: %u\n", backlight_config.enable);
        backlight_set(backlight_config.enable ? backlight_config.level : 0);
    }

    void backlight_step(void)
    {
        backlight_config.level++;
        if(backlight_config.level > BACKLIGHT_LEVELS)
        {
            backlight_config.level = 0;
        }
        backlight_config.enable = !!backlight_config.level;
        eeconfig_write_backlight(backlight_config.raw);
        dprintf("backlight step: %u\n", backlight_config.level);
        backlight_set(backlight_config.level);
    }

    void backlight_level(uint8_t level)
    {
        backlight_config.level ^= level;
        backlight_config.enable = !!backlight_config.level;
        eeconfig_write_backlight(backlight_config.raw);
        backlight_set(backlight_config.level);
    }

    // Plank Code for Backlight

    //#include <avr/io.h>
    //#include "backlight.h"

    #define CHANNEL OCR1B
    // Plank is OCR1C
    void backlight_init_ports()
    {

        // Setup PB7 as output and output low.
        DDRB |= (1<<6);
        PORTB &= ~(1<<6);
       
        // Use full 16-bit resolution.
        ICR1 = 0xFFFF;

        // I could write a wall of text here to explain... but TL;DW
        // Go read the ATmega32u4 datasheet.
        // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
       
        // Pin PB7 = OCR1C (Timer 1, Channel C)
       // Pin PB6 = OCR1B (Timer 1, Channel B)
        // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
       // Compare Output Mode = Clear on compare match, Channel C = COM1B1=1 COM1B0=0
        // (i.e. start high, go low when counter matches.)
        // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
        // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
       
        TCCR1A = _BV(COM1B1) | _BV(WGM11); // = 0b00001010;
        TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;

        backlight_init();
    }

    void backlight_set(uint8_t level)
    {
        if ( level == 0 )
        {
            // Turn off PWM control on PB6, revert to output low.
            TCCR1A &= ~(_BV(COM1B1));
            CHANNEL = 0x0;
            // Prevent backlight blink on lowest level
            PORTB &= ~(_BV(PORTB6));
        }
        else if ( level == BACKLIGHT_LEVELS )
        {
            // Prevent backlight blink on lowest level
            PORTB &= ~(_BV(PORTB6));
            // Turn on PWM control of PB6
            TCCR1A |= _BV(COM1B1);
            // Set the brightness
            CHANNEL = 0xFFFF;
        }
        else       
        {
            // Prevent backlight blink on lowest level
            PORTB &= ~(_BV(PORTB6));
            // Turn on PWM control of PB6
            TCCR1A |= _BV(COM1B1);
            // Set the brightness
            CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
        }
    }