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64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
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//
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// 6522Storage.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/09/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef _522Storage_hpp
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#define _522Storage_hpp
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#include <cstdint>
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namespace MOS {
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namespace MOS6522 {
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class MOS6522Storage {
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protected:
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// Phase toggle
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bool is_phase2_ = false;
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// The registers
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struct Registers {
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// "A low reset (RES) input clears all R6522 internal registers to logic 0"
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uint8_t output[2] = {0, 0};
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uint8_t input[2] = {0, 0};
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uint8_t data_direction[2] = {0, 0};
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uint16_t timer[2] = {0, 0};
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uint16_t timer_latch[2] = {0, 0};
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uint16_t last_timer[2] = {0, 0};
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int next_timer[2] = {-1, -1};
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uint8_t shift = 0;
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uint8_t auxiliary_control = 0;
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uint8_t peripheral_control = 0;
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uint8_t interrupt_flags = 0;
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uint8_t interrupt_enable = 0;
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bool timer_needs_reload = false;
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} registers_;
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// control state
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struct {
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bool line_one = false;
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bool line_two = false;
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} control_inputs_[2];
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bool timer_is_running_[2] = {false, false};
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bool last_posted_interrupt_status_ = false;
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enum InterruptFlag: uint8_t {
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CA2ActiveEdge = 1 << 0,
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CA1ActiveEdge = 1 << 1,
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ShiftRegister = 1 << 2,
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CB2ActiveEdge = 1 << 3,
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CB1ActiveEdge = 1 << 4,
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Timer2 = 1 << 5,
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Timer1 = 1 << 6,
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};
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};
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}
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}
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#endif /* _522Storage_hpp */
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