arch_avr_usart.h

Go to the documentation of this file.

/*
 * arch_avr_usart.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_USART_H__
#define __YASIMAVR_AVR_USART_H__
 
#include "arch_avr_globals.h"
#include "core/sim_interrupt.h"
 
YASIMAVR_BEGIN_NAMESPACE
 
 
//=======================================================================================
 
struct ArchAVR_USARTConfig {
 
    regbit_compound_t rbc_rx_data;  
    regbit_compound_t rbc_tx_data;
 
    regbit_t rb_rx_enable;          
    regbit_t rb_tx_enable;          
    regbit_t rb_rxc_inten;          
    regbit_t rb_rxc_flag;           
    regbit_t rb_txc_inten;          
    regbit_t rb_txc_flag;           
    regbit_t rb_txe_inten;          
    regbit_t rb_txe_flag;           
 
    regbit_t rb_baud_2x;            
    regbit_compound_t rbc_baud;     
 
    regbit_t rb_ferr;
    regbit_t rb_overrun;
    regbit_t rb_perr;
    regbit_compound_t rbc_chsize;
    regbit_t rb_clock_mode;
    regbit_t rb_parity;
    regbit_t rb_stopbits;
 
    int_vect_t iv_rxc;          
    int_vect_t iv_txc;          
    int_vect_t iv_txe;          
 
};
 
 
class AVR_ARCHAVR_PUBLIC_API ArchAVR_USART : public Peripheral {
 
public:
 
    ArchAVR_USART(uint8_t num, const ArchAVR_USARTConfig& config);
    virtual ~ArchAVR_USART();
 
    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 uint8_t ioreg_read_handler(reg_addr_t addr, uint8_t value) override;
    virtual void ioreg_write_handler(reg_addr_t addr, const ioreg_write_t& data) override;
 
private:
 
    class _PinDriver;
    friend class _PinDriver;
    class _Controller;
    friend class _Controller;
 
    const ArchAVR_USARTConfig& m_config;
 
    _PinDriver* m_driver;
    _Controller* m_ctrl;
    BoundFunctionSignalHook<ArchAVR_USART> m_ctrl_hook;
 
    InterruptFlag m_rxc_intflag;
    InterruptFlag m_txc_intflag;
    InterruptFlag m_txe_intflag;
 
    void update_bitrate();
    void extract_rx_data();
    void ctrl_signal_raised(const signal_data_t& sigdata, int);
 
};
 
 
YASIMAVR_END_NAMESPACE
 
#endif //__YASIMAVR_AVR_USART_H__