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// 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)")
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