arch_avr_wdt.h

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/*
 * arch_avr_wdt.h
 *
 *  Copyright 2021-2026 Clement Savergne <csavergne@yahoo.com>
 
    This file is part of yasim-avr.
 
    yasim-avr is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    yasim-avr is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with yasim-avr.  If not, see <http://www.gnu.org/licenses/>.
 */
 
//=======================================================================================
 
#ifndef __YASIMAVR_AVR_WDT_H__
#define __YASIMAVR_AVR_WDT_H__
 
#include "arch_avr_globals.h"
#include "core/sim_cycle_timer.h"
#include "core/sim_interrupt.h"
 
YASIMAVR_BEGIN_NAMESPACE
 
//=======================================================================================
 
struct ArchAVR_WDTConfig {
 
    unsigned long clock_frequency;
    reg_addr_t reg_wdt;
    regbit_compound_t rbc_delay;
    bitspec_t bs_chg_enable;
    bitspec_t bs_reset_enable;
    bitspec_t bs_int_enable;
    bitspec_t bs_int_flag;
    regbit_t rb_reset_flag;
    int_vect_t iv_wdt;
 
};
 
 
class AVR_ARCHAVR_PUBLIC_API ArchAVR_WDT : public Peripheral, public InterruptHandler {
 
public:
 
    explicit ArchAVR_WDT(const ArchAVR_WDTConfig& config);
 
    virtual bool init(Device& device) override;
    virtual void reset(int flags) override;
    virtual bool ctlreq(ctlreq_id_t req, ctlreq_data_t* data) override;
    virtual void ioreg_write_handler(reg_addr_t addr, const ioreg_write_t& data) override;
    virtual bool interrupt_ack_handler(int_vect_t vector) override;
 
private:
 
    const ArchAVR_WDTConfig& m_config;
    BoundFunctionCycleTimer<ArchAVR_WDT> m_wdt_timer;
    BoundFunctionCycleTimer<ArchAVR_WDT> m_lock_timer;
 
    cycle_count_t calculate_delay();
    void reschedule_timer();
    cycle_count_t wdt_timeout(cycle_count_t when);
    void lock_timeout();
 
};
 
 
YASIMAVR_END_NAMESPACE
 
#endif //__YASIMAVR_AVR_WDT_H__