/*
* LED_fading_02.c
* with 10bit valuetable and phasecorrect pwm
* Controller: ATmega88 @ 8MHz
*/

#include <avr/io.h>
#include <util/delay.h>

const unsigned int pwm_table_10[64] =
{
    0, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, 9, 10,
    11, 12, 13, 15, 17, 19, 21, 23, 26, 29, 32, 36, 40, 44, 49, 55,
    61, 68, 76, 85, 94, 105, 117, 131, 146, 162, 181, 202, 225, 250,
    279, 311, 346, 386, 430, 479, 534, 595, 663, 739, 824, 918, 1023
};

int main(void)
{
    DDRB |= (1<<PB1); // OC1A = output
    ICR1 = 1023;        // ICR1 = Top Value

    // Mode 10: PWM, Phase Correct, Prescaler = 1, Clear OC1A on compare match
    TCCR1A = (1 << COM1A1) + (1 << WGM11);
    TCCR1B = (1 << WGM13) + (1 << CS10);

    while(1)
    {
        for(int i=0; i<=63; i++)     // PWM inkrementieren
        {
            OCR1A = pwm_table_10[i];    // Tabellenwert i dem OCR1A zuweisen
            _delay_ms(50);
        }

        for(int i=63; i>= 1; i--)        // PWM dekrementieren
        {
            OCR1A = pwm_table_10[i];    // Tabellenwert i dem OCR1A zuweisen
            _delay_ms(50);
        }
    }
}