52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
#pragma once
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#include <cstdint>
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#include "Memory.h"
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#include "Ram.h"
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namespace EightBit {
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class InputOutput final : public Memory {
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public:
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enum class AccessType { Unknown, Reading, Writing };
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[[nodiscard]] uint16_t size() const noexcept override;
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[[nodiscard]] uint8_t peek(uint16_t address) const noexcept override;
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[[nodiscard]] uint8_t& reference(uint16_t address) noexcept override;
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int load(std::ifstream& file, int writeOffset = 0, int readOffset = 0, int limit = -1) override;
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int load(std::string path, int writeOffset = 0, int readOffset = 0, int limit = -1) override;
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int load(const std::vector<uint8_t>& bytes, int writeOffset = 0, int readOffset = 0, int limit = -1) override;
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[[nodiscard]] constexpr const auto& accessType() const noexcept { return m_access; }
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[[nodiscard]] constexpr auto& accessType() noexcept { return m_access; }
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[[nodiscard]] auto readPort(uint8_t port, AccessType access) noexcept {
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accessType() = access;
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return reference(port);
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}
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[[nodiscard]] auto readInputPort(uint8_t port) noexcept { return readPort(port, AccessType::Reading); }
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[[nodiscard]] auto readOutputPort(uint8_t port) noexcept { return readPort(port, AccessType::Writing); }
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void writePort(uint8_t port, uint8_t value, AccessType access) noexcept {
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accessType() = access;
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reference(port) = value;
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}
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void writeInputPort(uint8_t port, uint8_t value) noexcept { writePort(port, value, AccessType::Reading); }
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void writeOutputPort(uint8_t port, uint8_t value) noexcept { writePort(port, value, AccessType::Writing); }
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protected:
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void poke(uint16_t address, uint8_t value) noexcept override;
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private:
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Ram m_input = 0x100;
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Ram m_output = 0x100;
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uint8_t m_delivered = 0xff;
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AccessType m_access = AccessType::Unknown;
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};
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}
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