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Diffstat (limited to 'src/devices/bus/sms_ctrl/paddle.c')
-rw-r--r--src/devices/bus/sms_ctrl/paddle.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/src/devices/bus/sms_ctrl/paddle.c b/src/devices/bus/sms_ctrl/paddle.c
new file mode 100644
index 00000000000..e2418f38345
--- /dev/null
+++ b/src/devices/bus/sms_ctrl/paddle.c
@@ -0,0 +1,108 @@
+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/**********************************************************************
+
+ Sega Master System "Paddle Control" emulation
+
+**********************************************************************/
+
+#include "paddle.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type SMS_PADDLE = &device_creator<sms_paddle_device>;
+
+
+#define PADDLE_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/256)
+
+
+CUSTOM_INPUT_MEMBER( sms_paddle_device::dir_pins_r )
+{
+ UINT8 data = m_paddle_x->read();
+
+ if (m_read_state)
+ data >>= 4;
+
+ // The returned value is inverted due to IP_ACTIVE_LOW mapping.
+ return ~data;
+}
+
+
+CUSTOM_INPUT_MEMBER( sms_paddle_device::tr_pin_r )
+{
+ // The returned value is inverted due to IP_ACTIVE_LOW mapping.
+ return ~m_read_state;
+}
+
+
+static INPUT_PORTS_START( sms_paddle )
+ PORT_START("CTRL_PORT")
+ PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_paddle_device, dir_pins_r, NULL) // Directional pins
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) // Vcc
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) // TL
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED ) // TH
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_paddle_device, tr_pin_r, NULL)
+
+ PORT_START("PADDLE_X") // Paddle knob
+ PORT_BIT( 0xff, 0x80, IPT_PADDLE) PORT_SENSITIVITY(40) PORT_KEYDELTA(20) PORT_CENTERDELTA(0) PORT_MINMAX(0,255)
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor sms_paddle_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( sms_paddle );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// sms_paddle_device - constructor
+//-------------------------------------------------
+
+sms_paddle_device::sms_paddle_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, SMS_PADDLE, "Sega SMS Paddle", tag, owner, clock, "sms_paddle", __FILE__),
+ device_sms_control_port_interface(mconfig, *this),
+ m_paddle_pins(*this, "CTRL_PORT"),
+ m_paddle_x(*this, "PADDLE_X"),
+ m_read_state(0),
+ m_interval(PADDLE_INTERVAL)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void sms_paddle_device::device_start()
+{
+ m_start_time = machine().time();
+
+ save_item(NAME(m_start_time));
+ save_item(NAME(m_read_state));
+}
+
+
+//-------------------------------------------------
+// sms_peripheral_r - paddle read
+//-------------------------------------------------
+
+UINT8 sms_paddle_device::peripheral_r()
+{
+ int num_intervals = (machine().time() - m_start_time).as_double() / m_interval.as_double();
+ m_read_state = num_intervals & 1;
+
+ return m_paddle_pins->read();
+}