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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/**********************************************************************
Sega Game Gear EXT port emulation
Also known as Gear-to-Gear (or VS, in Japan) cable connector
**********************************************************************
**********************************************************************/
#ifndef MAME_BUS_GAMEGEAR_GGEXT_H
#define MAME_BUS_GAMEGEAR_GGEXT_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> gg_ext_port_device
class device_gg_ext_port_interface;
class gg_ext_port_device : public device_t, public device_slot_interface
{
public:
// construction/destruction
template <typename T>
gg_ext_port_device(machine_config const &mconfig, char const *tag, device_t *owner, T &&opts, char const *dflt)
: gg_ext_port_device(mconfig, tag, owner, 0)
{
option_reset();
opts(*this);
set_default_option(dflt);
set_fixed(false);
}
gg_ext_port_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
virtual ~gg_ext_port_device();
// static configuration helpers
auto th_input_handler() { return m_th_pin_handler.bind(); }
auto pixel_handler() { return m_pixel_handler.bind(); }
// Currently, only the support for SMS Controller Adaptor is emulated,
// for when SMS Compatibility mode is enabled. In that mode, the 10 pins
// of the EXT port follows the same numbering of a SMS Control port.
// Data returned by the port_r methods:
// bit 0 - pin 1 - Up
// bit 1 - pin 2 - Down
// bit 2 - pin 3 - Left
// bit 3 - pin 4 - Right
// bit 4 - pin 5 - Vcc (no data)
// bit 5 - pin 6 - TL (Button 1/Light Phaser Trigger)
// bit 6 - pin 7 - TH (Light Phaser sensor)
// pin 8 - GND
// bit 7 - pin 9 - TR (Button 2)
// pin 10 - Not connected
//
uint8_t port_r();
void port_w( uint8_t data );
void th_pin_w(int state);
uint32_t pixel_r();
//protected:
// device-level overrides
virtual void device_start() override;
device_gg_ext_port_interface *m_device;
private:
devcb_write_line m_th_pin_handler;
devcb_read32 m_pixel_handler;
};
// ======================> device_gg_ext_port_interface
// class representing interface-specific live sms_expansion card
class device_gg_ext_port_interface : public device_slot_card_interface
{
public:
// construction/destruction
virtual ~device_gg_ext_port_interface();
virtual uint8_t peripheral_r() { return 0xff; }
virtual void peripheral_w(uint8_t data) { }
protected:
device_gg_ext_port_interface(const machine_config &mconfig, device_t &device);
gg_ext_port_device *m_port;
};
// device type definition
DECLARE_DEVICE_TYPE(GG_EXT_PORT, gg_ext_port_device)
void gg_ext_port_devices(device_slot_interface &device);
#endif // MAME_BUS_GAMEGEAR_GGEXT_H
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