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68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
//
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// MFP68901.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 06/10/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#ifndef MFP68901_hpp
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#define MFP68901_hpp
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#include <cstdint>
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#include "../../ClockReceiver/ClockReceiver.hpp"
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namespace Motorola {
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namespace MFP68901 {
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class PortHandler {
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public:
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/*!
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Requests the current input on the GPIP port.
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*/
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virtual uint8_t get_port_input() {
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return 0xff;
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}
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};
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class MFP68901 {
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public:
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uint8_t read(int address);
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void write(int address, uint8_t value);
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void run_for(HalfCycles);
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HalfCycles get_next_sequence_point();
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void set_timer_event_input(int channel, bool value);
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void set_port_handler(PortHandler *);
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void set_port_input(uint8_t);
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uint8_t get_port_output();
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private:
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// MARK: - Timers
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enum class TimerMode {
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Stopped, EventCount, Delay, PulseWidth
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};
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void set_timer_mode(int timer, TimerMode, int prescale, bool reset_timer);
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void set_timer_data(int timer, uint8_t);
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uint8_t get_timer_data(int timer);
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void decrement_timer(int timer);
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struct Timer {
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TimerMode mode = TimerMode::Stopped;
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uint8_t value = 0;
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uint8_t reload_value = 0;
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int prescale = 1;
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int divisor = 0;
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bool event_input = false;
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} timers_[4];
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HalfCycles cycles_left_;
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};
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}
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}
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#endif /* MFP68901_hpp */
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