// license:BSD-3-Clause // copyright-holders:Wilbert Pol /********************************************************************** MSX Arkanoid Vaus controller emulation **********************************************************************/ #include "emu.h" #include "vaus.h" namespace { INPUT_PORTS_START(msx_vaus) PORT_START("BUTTON") PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_START("POT") PORT_BIT(0x1ff, 0x100, IPT_PADDLE) PORT_MINMAX(110, 380) PORT_SENSITIVITY(30) PORT_KEYDELTA(20) INPUT_PORTS_END class msx_vaus_device : public device_t, public device_msx_general_purpose_port_interface { public: msx_vaus_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); virtual u8 read() override; virtual void pin_6_w(int state) override; virtual void pin_8_w(int state) override; protected: virtual void device_start() override ATTR_COLD; virtual void device_reset() override ATTR_COLD; virtual ioport_constructor device_input_ports() const override { return INPUT_PORTS_NAME(msx_vaus); } TIMER_CALLBACK_MEMBER(copy_counter); private: required_ioport m_button; required_ioport m_pot; emu_timer *m_timer; u8 m_old_pin6; u8 m_old_pin8; u16 m_counter; u16 m_shift_reg; }; msx_vaus_device::msx_vaus_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, MSX_VAUS, tag, owner, clock) , device_msx_general_purpose_port_interface(mconfig, *this) , m_button(*this, "BUTTON") , m_pot(*this, "POT") , m_timer(nullptr) { } void msx_vaus_device::device_start() { m_timer = timer_alloc(FUNC(msx_vaus_device::copy_counter), this); save_item(NAME(m_old_pin6)); save_item(NAME(m_old_pin8)); save_item(NAME(m_counter)); save_item(NAME(m_shift_reg)); } void msx_vaus_device::device_reset() { m_old_pin8 = 0; m_counter = 0; m_shift_reg = 0; } u8 msx_vaus_device::read() { // bit 0/pin 1 - shift register output // bit 1/pin 2 - button return (m_button->read() & 0x02) | (BIT(m_shift_reg, 8) ? 0x01 : 0x00) | 0xfc; } void msx_vaus_device::pin_6_w(int state) { if (!m_old_pin6 && state) { m_shift_reg <<= 1; } m_old_pin6 = state; } void msx_vaus_device::pin_8_w(int state) { if (!state) { m_counter = 0; m_timer->adjust(attotime::never); } else if (!m_old_pin8) { // start counting; the counter is incremented on a ~96k2 clock m_counter = m_pot->read(); m_timer->adjust(attotime::from_ticks(m_counter, 96200)); } m_old_pin8 = state; } TIMER_CALLBACK_MEMBER(msx_vaus_device::copy_counter) { m_shift_reg = m_counter; } } // anonymous namespace DEFINE_DEVICE_TYPE_PRIVATE(MSX_VAUS, device_msx_general_purpose_port_interface, msx_vaus_device, "msx_vaus", "Taito Arkanoid Vaus Controller (MSX)")