112 lines
2 KiB
C
112 lines
2 KiB
C
#ifndef TIMER0_H
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# define TIMER0_H
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# include <avr/io.h>
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# include "mystd.h"
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# include "timer_global.h"
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static inline void t0_init_fpwm_3(e_timer_prescaler prescaler) {
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// Fast PWM (8-bit): WGM22:0 = 0b011
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TCCR0A = BV(WGM00) | BV(WGM01);
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// reset to zero -> timer off
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TCCR0B &= ~(BV(CS02) | BV(CS01) | BV(CS00));
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// set the correct prescaler
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switch (prescaler) {
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case (PRESCALER_1): {
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TCCR0B |= (BV(CS00));
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break;
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}
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case (PRESCALER_8): {
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TCCR0B |= (BV(CS01));
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break;
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}
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case (PRESCALER_64): {
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TCCR0B |= (BV(CS01) | BV(CS00));
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break;
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}
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case (PRESCALER_256): {
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TCCR0B |= (BV(CS02));
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break;
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}
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case (PRESCALER_1024): {
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TCCR0B |= (BV(CS02) | BV(CS00));
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break;
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}
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case (PRESCALER_OFF): {
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break;
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}
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}
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}
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static inline void t0_set_ocr(enum e_timer_output output, uint8_t value) {
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if (output & TO_A)
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OCR0A = value;
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if (output & TO_B)
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OCR0B = value;
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}
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static inline void t0_set_out_mode(enum e_timer_output output, enum e_timer_output_mode mode) {
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if (output & TO_A) {
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TCCR0A &= ~(BV(COM0A1) | BV(COM0A0));
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switch (mode) {
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case (TOM_00): {
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break;
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}
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case (TOM_10): {
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TCCR0A |= (BV(COM0A1));
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break;
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}
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case (TOM_01): {
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TCCR0A |= (BV(COM0A0));
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break;
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}
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case (TOM_11): {
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TCCR0A |= (BV(COM0A1) | BV(COM0A0));
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break;
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}
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}
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}
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if (output & TO_B) {
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TCCR0A &= ~(BV(COM0B1) | BV(COM0B0));
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switch (mode) {
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case (TOM_00): {
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break;
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}
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case (TOM_10): {
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TCCR0A |= (BV(COM0B1));
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break;
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}
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case (TOM_01): {
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TCCR0A |= (BV(COM0B0));
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break;
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}
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case (TOM_11): {
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TCCR0A |= (BV(COM0B1) | BV(COM0B0));
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break;
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}
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}
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}
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}
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// OC2B => RED => PD3
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// OC0B => GREEN => PD5
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// OC0A => BLUE => PD6
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#endif /* TIMER0_H */
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/*
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// OC2B = PD3 → output
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DDRD |= BV(DDD3) | BV(DDD5) | BV(DDD6);
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// Fast PWM (8-bit): WGM22:0 = 0b011
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TCCR0A = BV(WGM00) | BV(WGM01);
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TCCR0A |= BV(COM0B1);
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// 50% duty cycle
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OCR0B = 128;
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// Start timer, prescaler = 64
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TCCR0B = BV(CS02);
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*/
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