arch_avr_usi.h

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/*
 * arch_avr_usi.h
 *
 *  Copyright 2025-2026 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_USI_H__
#define __YASIMAVR_AVR_USI_H__
 
#include "arch_avr_globals.h"
#include "core/sim_interrupt.h"
 
YASIMAVR_BEGIN_NAMESPACE
 
 
//=======================================================================================
 
struct ArchAVR_USIConfig {
 
    regbit_t rb_wiremode;           
    regbit_t rb_clk_sel;            
    regbit_t rb_clk_strobe;         
    regbit_t rb_clk_toggle;         
    reg_addr_t reg_data;            
    reg_addr_t reg_buffer;          
    regbit_t rb_counter;            
    regbit_t rb_ovf_flag;           
    regbit_t rb_ovf_inten;          
    regbit_t rb_start_flag;         
    regbit_t rb_start_inten;        
    regbit_t rb_stop_flag;          
 
    int_vect_t iv_ovf;              
    int_vect_t iv_start;            
 
};
 
 
class AVR_ARCHAVR_PUBLIC_API ArchAVR_USI : public Peripheral {
 
public:
 
    explicit ArchAVR_USI(const ArchAVR_USIConfig& config);
    virtual ~ArchAVR_USI();
 
    virtual bool init(Device& device) override;
    virtual void reset(int flags) override;
    virtual void ioreg_write_handler(reg_addr_t addr, const ioreg_write_t& data) override;
 
private:
 
    class _PinDriver;
    friend class _PinDriver;
 
    const ArchAVR_USIConfig& m_config;
 
    _PinDriver* m_driver;
    int m_clk_mode;
    int m_wire_mode;
    bool m_start_detected;
 
    InterruptFlag m_ovf_intflag;
    InterruptFlag m_start_intflag;
 
    DataSignal m_signal;
 
    BoundFunctionSignalHook<ArchAVR_USI> m_timer_hook;
 
    void timer_raised(const signal_data_t& sigdata, int hooktag);
    void set_wire_mode(int new_mode, bool force);
    bool output_latched() const;
    void shift_data();
    void update_data_output();
    void inc_counter();
    void clock_state_changed(bool dig_state);
    void data_state_changed(bool dig_state);
 
};
 
 
YASIMAVR_END_NAMESPACE
 
#endif //__YASIMAVR_AVR_USI_H__