Widzicie gdzie jest błąd?
Przy takim ustawieniu będziesz miał PWM'a tylko na OC1A (PD5). PD4 będzie się zachowywał jak normalny pin ustawiony jako wyjście.
kicajek napisał(a):
Jakby co to nie wiem dlaczego, ale u mnie tylko tak działa
Tak też zadziała:
[syntax=c]TCCR1A = (1<<WGM11) | (1<<COM1A1) | (1<<COM1B1);//Clear OC1A/OC1B on compare match, set at BOTTOM (normal mode)
//TCCR1A = (1<<WGM11) | (1<<COM1A1) | (1<<COM1A0) | (1<<COM1B1) | (1<<COM1B0);//Set OC1A/OC1B on compare match, clear at BOTTOM (inverting mode)[/syntax]
Poniżej kodzik z komentarzami i wzorami:
[syntax=c]#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#define MAX 15625
//0xFF - 8bits, 0x1FF - 9bits, 0x3FF-10bits, 0x7FF-11bits, 0xFFF-12bits, ... , 0xFFFF-16bits
int main(void) {
DDRD |= (1<<PD4) | (1<<PD5);//PD5-OC1A, PD4-OC1B must be set as output
// *** Mode 14, TOP-ICR1, OCR1x-BOTTOM, TOV1 Flag Set on TOP ****
TCCR1A |= (1<<WGM11);
TCCR1B |= (1<<WGM13) | (1<<WGM12);
// *** Compare Output Mode, Fast PWM ***
TCCR1A |= (1<<COM1A1) | (1<<COM1B1);//Clear OC1A/OC1B on compare match, set at BOTTOM (normal mode)
//TCCR1A |= (1<<COM1A1) | (1<<COM1B1) | (1<<COM1A0) | (1<<COM1B0);//Set OC1A/OC1B on compare match, clear at BOTTOM (inverting mode)
// *** Clock Select Bit Description ***
//TCCR1B |= (1<<CS10);//Prescaler 1
TCCR1B |= (1<<CS11);//Prescaler 8
//TCCR1B |= (1<<CS11) | (1<<CS10);//Prescaler 64
ICR1 = MAX;
//*** How to calculate ***
//PWMfreq = FCPU / N / (1+TOP)
//TOP = (FCPU / N / PWMfreq) - 1;
//N - prescaler divider (1, 8, 64, 256, 1024)
//TOP - ICR1
//*** Examples ***
//FCPU=8MHz, N=8, ICR1 = 15625, PWMfreq -> 64Hz
//FCPU=8MHz, N=1, PWMfreq=400Hz, ICR1 -> 20000 - 1 = 19999
//FCPU=8MHz, PWMfreq=100Hz, N=1, ICR1 = 80000 - 1 = 79999 > 65535, for N=8 -> ICR1 = 10000 - 1 = 9999
while(1)
{
// *** test of PWM ***
uint16_t i=0;
for(i=0; i<MAX; i++){
OCR1A = i;
OCR1B = MAX - OCR1A;
_delay_us(100);
}
for(i=MAX; i>0; i--){
OCR1A = i;
OCR1B = MAX - OCR1A;
_delay_us(100);
}
// *** or set PWM with const duty ***
//OCR1A = MAX / 8;
//OCR1B = MAX - OCR1A;
}
}[/syntax]
Statystyki: Napisane przez anshar — 12 lut 2017, o 03:44
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