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// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
* QtMips - MIPS 32-bit Architecture Subset Simulator
*
* Implemented to support following courses:
*
* B35APO - Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b35apo
*
* B4M35PAP - Advanced Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
*
* Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
* Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
* Czech Technical University (http://www.cvut.cz/)
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
******************************************************************************/
#ifndef SERIALPORT_H
#define SERIALPORT_H
#include <QObject>
#include <QMap>
#include <cstdint>
#include <qtmipsexception.h>
#include "peripheral.h"
namespace machine {
class SerialPort : public MemoryAccess {
Q_OBJECT
public:
SerialPort();
~SerialPort();
signals:
void tx_byte(unsigned int data);
void rx_byte_pool(int fd, unsigned int &data, bool &available) const;
void write_notification(std::uint32_t address, std::uint32_t value);
void read_notification(std::uint32_t address, std::uint32_t *value) const;
void signal_interrupt(uint irq_level, bool active) const;
public slots:
void rx_queue_check() const;
public:
bool wword(std::uint32_t address, std::uint32_t value) override;
std::uint32_t rword(std::uint32_t address, bool debug_access = false) const override;
virtual std::uint32_t get_change_counter() const override;
private:
void rx_queue_check_internal() const;
mutable std::uint32_t change_counter;
void pool_rx_byte() const;
void update_rx_irq() const;
void update_tx_irq() const;
mutable std::uint32_t rx_st_reg;
mutable std::uint32_t rx_data_reg;
std::uint32_t tx_st_reg;
std::uint8_t tx_irq_level;
std::uint8_t rx_irq_level;
mutable bool tx_irq_active;
mutable bool rx_irq_active;
};
}
#endif // SERIALPORT_H
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