#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <dio.h>

/*
const struct avr_mmcu_vcd_trace_t _mytrace[]  _MMCU_ = {
	{ AVR_MCU_VCD_SYMBOL("PORTB"), .what = (void *)&PORTB, },
};
*/

#define FPS                 100
#define FPS_MS              1000 / FPS
#define MULT                5

typedef struct {
    uint8_t value;
    int8_t inc;
} counter_t;

void step_counter(counter_t *counter) {
    int16_t value = counter->value;
    value += counter->inc;

    if (value >= 255) {
        counter->value = 255;
        counter->inc = -1;
    } else if (value <= 0) {
        counter->value = 0;
        counter->inc = 1;
    } else {
        counter->value = value;
    }
}

int main(void) {
    dio_t dio0 = (dio_t){ .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 0 };
    dio_t dio1 = (dio_t){ .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 1 };
    dio_set_direction(&dio0, LINE_OUT);
    dio_set_direction(&dio1, LINE_OUT);

    // GTCCR = _BV(TSM) | _BV(PSR0);
    TCCR0A = _BV(COM0A1) | _BV(COM0A0) | _BV(COM0B1) | _BV(COM0B0) | _BV(WGM01) | _BV(WGM00);
    TCCR0B = _BV(WGM02) | _BV(CS00);

    counter_t red  = (counter_t){ .value = 128, .inc = -1 };
    counter_t blue  = (counter_t){ .value = 128, .inc = -1 };

    // GTCCR &= ~_BV(TSM);

    while(1) {
        step_counter(&red);
        step_counter(&blue);

        OCR0A = red.value;
        OCR0B = blue.value;

        _delay_ms(FPS_MS);
    }

    return 0;
}