EightBit/inc/InputOutput.h
2021-07-18 14:28:40 +01:00

52 lines
1.8 KiB
C++

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