mirror of https://github.com/lefticus/6502-cpp.git
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
#ifndef INC_6502_C_C64_HPP
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#define INC_6502_C_C64_HPP
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#include <algorithm>
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#include <array>
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#include <chrono>
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#include "6502.hpp"
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#include "petscii.hpp"
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#include "vicii.hpp"
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namespace c64 {
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struct Joystick
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{
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std::uint8_t state{};
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[[nodiscard]] constexpr bool up() const noexcept { return (state & 1) == 0; }
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[[nodiscard]] constexpr bool left() const noexcept { return (state & 4) == 0; }
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[[nodiscard]] constexpr bool fire() const noexcept { return (state & 16) == 0; }
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[[nodiscard]] constexpr bool right() const noexcept { return (state & 8) == 0; }
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[[nodiscard]] constexpr bool down() const noexcept { return (state & 2) == 0; }
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};
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struct Clock
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{
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using milliseconds = std::chrono::duration<std::uint16_t, std::milli>;
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static constexpr std::uint16_t TimerAControl = 0xDC0E;
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static constexpr std::uint16_t TimerALowByte = 0xDC04;
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static constexpr std::uint16_t TimerAHighByte = 0xDC05;
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// return elapsed time since last restart
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[[nodiscard]] milliseconds restart() noexcept
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{
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// stop Timer A
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mos6502::poke(TimerAControl, 0b00000000);
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// last value
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const auto previous_value = static_cast<std::uint16_t>(
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mos6502::peek(TimerALowByte) | (static_cast<uint16_t>(mos6502::peek(TimerAHighByte)) << 8));
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// reset timer
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mos6502::poke(TimerALowByte, 0xFF);
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mos6502::poke(TimerAHighByte, 0xFF);
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// restart timer A
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mos6502::poke(TimerAControl, 0b00010001);
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return milliseconds{ 0xFFFF - previous_value };
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}
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Clock() noexcept { [[maybe_unused]] const auto value = restart(); }
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};
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}// namespace c64
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#endif// INC_6502_C_C64_HPP
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