112 lines
2 KiB
C
112 lines
2 KiB
C
#ifndef TIMER2_H
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# define TIMER2_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 t2_init_fpwm_3(e_timer_prescaler prescaler) {
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// Fast PWM (8-bit): WGM22:0 = 0b011
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TCCR2A = _BV(WGM20) | _BV(WGM21);
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// reset to zero -> timer off
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TCCR2B &= ~(_BV(CS22) | _BV(CS21) | _BV(CS20));
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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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TCCR2B |= (_BV(CS20));
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break;
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}
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case (PRESCALER_8): {
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TCCR2B |= (_BV(CS21));
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break;
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}
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case (PRESCALER_64): {
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TCCR2B |= (_BV(CS21) | _BV(CS20));
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break;
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}
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case (PRESCALER_256): {
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TCCR2B |= (_BV(CS22));
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break;
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}
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case (PRESCALER_1024): {
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TCCR2B |= (_BV(CS22) | _BV(CS20));
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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 t2_set_ocr(enum e_timer_output output, uint8_t value) {
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if (output & TO_A)
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OCR2A = value;
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if (output & TO_B)
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OCR2B = value;
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}
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static inline void t2_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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TCCR2A &= ~(_BV(COM2A1) | _BV(COM2A0));
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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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TCCR2A |= (_BV(COM2A1));
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break;
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}
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case (TOM_01): {
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TCCR2A |= (_BV(COM2A0));
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break;
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}
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case (TOM_11): {
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TCCR2A |= (_BV(COM2A1) | _BV(COM2A0));
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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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TCCR2A &= ~(_BV(COM2B1) | _BV(COM2B0));
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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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TCCR2A |= (_BV(COM2B1));
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break;
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}
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case (TOM_01): {
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TCCR2A |= (_BV(COM2B0));
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break;
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}
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case (TOM_11): {
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TCCR2A |= (_BV(COM2B1) | _BV(COM2B0));
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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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TCCR2A = _BV(GM20) | _BV(GM21);
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TCCR2A |= _BV(COM2B1);
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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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TCCR2B = _BV(CS22);
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*/
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