EightBit/inc/Device.h
Adrian Conlon d0467421ff Improve compatibility with .net emulator code.
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
2019-11-09 18:58:23 +00:00

85 lines
2.4 KiB
C++

#pragma once
#include "EventArgs.h"
#include "Signal.h"
#define DECLARE_PIN_SIGNALS(name) \
Signal<EventArgs> Raising ## name; \
Signal<EventArgs> Raised ## name; \
Signal<EventArgs> Lowering ## name; \
Signal<EventArgs> Lowered ## name;
#define DECLARE_PIN_LEVEL_RAISE(name) \
virtual void raise ## name();
#define DECLARE_PIN_LEVEL_LOWER(name) \
virtual void lower ## name();
#define DECLARE_PIN_LEVEL_CHANGERS(name) \
DECLARE_PIN_LEVEL_RAISE(name) \
DECLARE_PIN_LEVEL_LOWER(name)
#define DEFINE_PIN_LEVEL_RAISE(name, within) \
void EightBit:: within ::raise ## name() { \
if (lowered( name ())) { \
Raising ## name.fire(EventArgs::empty()); \
raise( name ()); \
Raised ## name.fire(EventArgs::empty()); \
} \
}
#define DEFINE_PIN_LEVEL_LOWER(name, within) \
void EightBit:: within ::lower ## name() { \
if (raised( name ())) { \
Lowering ## name.fire(EventArgs::empty()); \
lower( name ()); \
Lowered ## name.fire(EventArgs::empty()); \
} \
}
#define DEFINE_PIN_LEVEL_CHANGERS(name, within) \
DEFINE_PIN_LEVEL_RAISE(name, within) \
DEFINE_PIN_LEVEL_LOWER(name, within)
#define DECLARE_PIN_MEMBER(name) \
PinLevel m_## name ## _Line = PinLevel::Low;
#define DECLARE_PIN(name, visibility) \
public: DECLARE_PIN_SIGNALS(name) \
[[nodiscard]] PinLevel& name () noexcept { return m_## name ## _Line; } \
visibility : DECLARE_PIN_LEVEL_CHANGERS(name) \
private: DECLARE_PIN_MEMBER(name)
// Input pins have a degree of external control
#define DECLARE_PIN_INPUT(name) DECLARE_PIN(name, public)
// Output pins may only be internally controlled
#define DECLARE_PIN_OUTPUT(name) DECLARE_PIN(name, protected)
namespace EightBit {
class Device {
public:
enum class PinLevel {
Low, High
};
static constexpr auto raised(const PinLevel line) { return line == PinLevel::High; }
static void raise(PinLevel& line) noexcept { line = PinLevel::High; }
static constexpr auto lowered(const PinLevel line) { return line == PinLevel::Low; }
static void lower(PinLevel& line) noexcept { line = PinLevel::Low; }
static void match(PinLevel& line, int condition) noexcept { match(line, condition != 0); }
static void match(PinLevel& line, bool condition) noexcept { condition ? raise(line) : lower(line); }
static void match(PinLevel& out, PinLevel in) noexcept { out = in; }
virtual ~Device() {};
[[nodiscard]] bool powered() noexcept { return raised(POWER()); }
DECLARE_PIN_INPUT(POWER)
protected:
Device() noexcept {};
};
}