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#include <stdlib.h>
#include <avr/power.h>
#include <avr/io.h>
#include <util/delay.h>
void set_frequency(int frequency) {
int i = F_CPU / (2*8);
OCR0A = i/frequency;
}
int main(void) {
// Base clock: 8MHz.
clock_prescale_set(clock_div_8);
DDRA |= (1 << DDA4);
DDRA |= (1 << DDA7); // OCR1A
DDRA |= (1 << DDA6); // OCR0B
DDRB |= (1 << DDB2); // OCR0A
// PORTB |= _BV(DDB2);
// PORTA |= (1 << DDA7);
// PORTA |= (1 << DDA6);
TCCR0A |= (1 << COM0A1) | (1 << COM0B1); // set non-inverting mode
// TCCR0A |= (1 << WGM11) | (1 << WGM10); // set 10bit phase corrected PWM Mode
TCCR0A |= (1 << WGM10); // 8 bit PWM
TCCR0B |= (1 << CS01); // prescaler
TCCR1A |= (1 << COM0A1); // set non-inverting mode
// TCCR0A |= (1 << WGM11) | (1 << WGM10); // set 10bit phase corrected PWM Mode
TCCR1A |= (1 << WGM10); // 8 bit PWM
TCCR1B |= (1 << CS01); // prescaler
uint32_t tick = 0;
while (1) {
tick += 1;
OCR0A = abs((tick % 511) - 255) * 0.2; // green
OCR0B = abs(((tick + 127) % 511) - 255) * 0.2; // yellow
OCR1A = abs(((tick + 255) % 511) - 255) * 0.1; // blue
_delay_ms(10);
// set_frequency(tick % 50);
// _delay_ms(200);
// PORTA |= _BV(DDA4);
// _delay_ms(500);
// PORTA &= ~_BV(DDA4);
// _delay_ms(500);
}
return 0;
}
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