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Diffstat (limited to 'src/devices/bus/msx/ctrl/vaus.cpp')
-rw-r--r--src/devices/bus/msx/ctrl/vaus.cpp115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/devices/bus/msx/ctrl/vaus.cpp b/src/devices/bus/msx/ctrl/vaus.cpp
new file mode 100644
index 00000000000..466ececd4c7
--- /dev/null
+++ b/src/devices/bus/msx/ctrl/vaus.cpp
@@ -0,0 +1,115 @@
+// 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)")