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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/**********************************************************************
Nintendo Family Computer & Entertainment System controller port
emulation
**********************************************************************
Known Issues:
- Currently the FC expansion port is emulated as a control port
**********************************************************************/
#ifndef MAME_BUS_NES_CTRL_CTRL_H
#define MAME_BUS_NES_CTRL_CTRL_H
#pragma once
#include "screen.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class nes_control_port_device;
// ======================> device_nes_control_port_interface
class device_nes_control_port_interface : public device_interface
{
public:
// construction/destruction
virtual ~device_nes_control_port_interface();
virtual u8 read_bit0() { return 0; }
virtual u8 read_bit2() { return 0; } // intended only for P2 microphone
virtual u8 read_bit34() { return 0; }
virtual u8 read_exp(offs_t offset) { return 0; }
virtual void write(u8 data) { }
protected:
device_nes_control_port_interface(const machine_config &mconfig, device_t &device);
// helper to keep track of strobe bit, returns true on 1 to 0 transitions
bool write_strobe(u8 data) { u8 prev = m_strobe; m_strobe = data & 1; return prev && !m_strobe; }
nes_control_port_device *m_port;
u8 m_strobe;
};
// ======================> nes_control_port_device
class nes_control_port_device : public device_t,
public device_single_card_slot_interface<device_nes_control_port_interface>
{
public:
// construction/destruction
template <typename T>
nes_control_port_device(machine_config const &mconfig, char const *tag, device_t *owner, T &&opts, char const *dflt)
: nes_control_port_device(mconfig, tag, owner)
{
option_reset();
opts(*this);
set_default_option(dflt);
set_fixed(false);
}
nes_control_port_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock = XTAL());
virtual ~nes_control_port_device();
u8 read_bit0();
u8 read_bit2();
u8 read_bit34();
u8 read_exp(offs_t offset);
void write(u8 data);
template <typename T> void set_screen_tag(T &&tag) { m_screen.set_tag(std::forward<T>(tag)); }
// for peripherals that interact with the machine's screen
required_device<screen_device> m_screen;
protected:
// device-level overrides
virtual void device_start() override;
// devices
device_nes_control_port_interface *m_device;
};
// device type definition
DECLARE_DEVICE_TYPE(NES_CONTROL_PORT, nes_control_port_device)
void nes_control_port1_devices(device_slot_interface &device);
void nes_control_port2_devices(device_slot_interface &device);
void nes_control_special_devices(device_slot_interface &device);
void fc_control_port1_devices(device_slot_interface &device);
void fc_control_port2_devices(device_slot_interface &device);
void fc_expansion_devices(device_slot_interface &device);
void famibox_control_port12_devices(device_slot_interface &device);
void famibox_control_port3_devices(device_slot_interface &device);
#endif // MAME_BUS_NES_CTRL_CTRL_H
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