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Diffstat (limited to 'src/devices/bus/sms_ctrl/mdpad.cpp')
-rw-r--r--src/devices/bus/sms_ctrl/mdpad.cpp82
1 files changed, 82 insertions, 0 deletions
diff --git a/src/devices/bus/sms_ctrl/mdpad.cpp b/src/devices/bus/sms_ctrl/mdpad.cpp
new file mode 100644
index 00000000000..7df30b42de0
--- /dev/null
+++ b/src/devices/bus/sms_ctrl/mdpad.cpp
@@ -0,0 +1,82 @@
+// 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")