avr_software_emulator.h

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/*
 * Copyright (c) 2024 ykat UG (haftungsbeschraenkt) - All Rights Reserved
 *
 * Permission for non-commercial use is hereby granted,
 * free of charge, without warranty of any kind.
 */
#ifndef ZRTOS_BOARD_AVR_SOFTWARE_EMULATOR_H
#define ZRTOS_BOARD_AVR_SOFTWARE_EMULATOR_H
#ifdef __cplusplus
extern "C" {
#endif


#if defined(ZRTOS_BOARD__AVR_SOFTWARE_EMULATOR) || defined(__DOXYGEN__)
#define ZRTOS_BOARD__FOUND


#include <avr/interrupt.h>
#include <avr/wdt.h>


#define ZRTOS_BOARD__TICK_PERIOD_MS 1

void zrtos_board__start_tick_timer(void){
    ZRTOS_ARCH__DISABLE_INTERRUPTS();
    // Clear registers
    TCCR1A = 0;
    TCCR1B = 0;
    TCNT1 = 0;

    // 1000 Hz (16000000/((249+1)*64))
    OCR1A = 249;
    // CTC
    TCCR1B |= (1 << WGM12);
    // Prescaler 64
    TCCR1B |= (1 << CS11) | (1 << CS10);
    // Output Compare Match A Interrupt Enable
    TIMSK1 |= (1 << OCIE1A);
    ZRTOS_ARCH__ENABLE_INTERRUPTS();
}

void zrtos_board__stop_tick_timer(void){
    ZRTOS_ARCH__DISABLE_INTERRUPTS();
    TIMSK1 &= ~(1 << OCIE1A);
    ZRTOS_ARCH__ENABLE_INTERRUPTS();
}

ISR(TIMER1_COMPA_vect,ISR_NAKED){
    ZRTOS_ARCH__SAVE_CPU_STATE();
    zrtos_board__on_tick();
    //avr/time.h system_tick();
    ZRTOS_ARCH__LOAD_CPU_STATE();
    zrtos_board__on_tick_naked();
    ZRTOS_ARCH__RETURN_FROM_INTERRUPT();
}

#define ZRTOS_BOARD__WATCH_DOG_START() \
    wdt_enable(WDTO_8S);

#define ZRTOS_BOARD__WATCH_DOG_STOP() \
    wdt_disable();

#define ZRTOS_BOARD__WATCH_DOG_RESET() \
    wdt_reset();

ISR(WDT_vect,ISR_NAKED){
    ZRTOS_ARCH__FATAL();
}

#endif


#ifdef __cplusplus
}
#endif
#endif