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55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
//
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// Copper.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 16/09/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef Copper_h
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#define Copper_h
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#include "DMADevice.hpp"
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namespace Amiga {
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class Copper: public DMADevice<2> {
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public:
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using DMADevice<2>::DMADevice;
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/// Offers a DMA slot to the Copper, specifying the current beam position and Blitter status.
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///
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/// @returns @c true if the slot was used; @c false otherwise.
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bool advance_dma(uint16_t position, uint16_t blitter_status);
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/// Forces a reload of address @c id (i.e. 0 or 1) and restarts the Copper.
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template <int id> void reload() {
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address_ = pointer_[id];
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state_ = State::FetchFirstWord;
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}
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/// Sets the Copper control word.
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void set_control(uint16_t c) {
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control_ = c;
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}
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/// Forces the Copper into the stopped state.
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void stop() {
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state_ = State::Stopped;
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}
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private:
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uint32_t address_ = 0;
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uint16_t control_ = 0;
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enum class State {
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FetchFirstWord, FetchSecondWord, Waiting, Stopped,
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} state_ = State::Stopped;
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bool skip_next_ = false;
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uint16_t instruction_[2]{};
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};
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}
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#endif /* Copper_h */
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