// license:BSD-3-Clause // copyright-holders:Vas Crabb /********************************************************************** Sega Mega Drive Control Pad emulation **********************************************************************/ #include "emu.h" #include "mdpad.h" namespace { INPUT_PORTS_START( sms_mdpad ) PORT_START("PAD") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_NAME("%p B") PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_NAME("%p C") PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("%p A") PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START ) INPUT_PORTS_END class sms_mdpad_device : public device_t, public device_sms_control_interface { public: sms_mdpad_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock); virtual u8 in_r() override; virtual void out_w(u8 data, u8 mem_mask) override; protected: virtual ioport_constructor device_input_ports() const override { return INPUT_PORTS_NAME(sms_mdpad); } virtual void device_start() override ATTR_COLD; private: required_ioport m_pad; u8 m_th; }; sms_mdpad_device::sms_mdpad_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock) : device_t(mconfig, SMS_MDPAD, tag, owner, clock), device_sms_control_interface(mconfig, *this), m_pad(*this, "PAD"), m_th(1) { } u8 sms_mdpad_device::in_r() { ioport_value const lines = m_pad->read(); if (m_th) return BIT(lines, 0, 6); else return (BIT(lines, 6, 2) << 4) | BIT(lines, 0, 2); } void sms_mdpad_device::out_w(u8 data, u8 mem_mask) { m_th = BIT(data, 6); } void sms_mdpad_device::device_start() { save_item(NAME(m_th)); } } // anonymous namespace DEFINE_DEVICE_TYPE_PRIVATE(SMS_MDPAD, device_sms_control_interface, sms_mdpad_device, "sms_mdpad", "Sega Mega Drive Control Pad")