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/**********************************************************************
Sega Master System "Sports Pad" (japanese model) emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
// The japanese Sports Pad controller is only required to play the cartridge
// Sports Pad Soccer, released in Japan. It uses a different mode than the
// used by the US model, due to missing output lines on Sega Mark III
// controller ports.
#include "sportsjp.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type SMS_SPORTS_PAD_JP = &device_creator<sms_sports_pad_jp_device>;
#define SPORTS_PAD_JP_INTERVAL attotime::from_hz(30000) // 30Hz (not measured)
DECLARE_CUSTOM_INPUT_MEMBER( sms_sports_pad_jp_device::dir_pins_r )
{
UINT8 data = 0;
switch (m_read_state)
{
case 0:
data = m_sports_jp_x->read() >> 4;
break;
case 1:
data = m_sports_jp_x->read();
break;
case 2:
data = m_sports_jp_y->read() >> 4;
break;
case 3:
data = m_sports_jp_y->read();
break;
}
// The returned value is inverted due to IP_ACTIVE_LOW mapping.
return ~(data & 0x0f);
}
static INPUT_PORTS_START( sms_sports_pad_jp )
PORT_START("SPORTS_JP_IN")
PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_sports_pad_jp_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 (Button 1)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED ) // TH
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON2 ) // TR (Button 2)
PORT_START("SPORTS_JP_X") /* Sports Pad X axis */
PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(40)
PORT_START("SPORTS_JP_Y") /* Sports Pad Y axis */
PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(40)
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor sms_sports_pad_jp_device::device_input_ports() const
{
return INPUT_PORTS_NAME( sms_sports_pad_jp );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// sms_sports_pad_jp_device - constructor
//-------------------------------------------------
sms_sports_pad_jp_device::sms_sports_pad_jp_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, SMS_SPORTS_PAD_JP, "Sports Pad JP", tag, owner, clock, "sms_sports_pad_jp", __FILE__),
device_sms_control_port_interface(mconfig, *this),
m_sports_jp_in(*this, "SPORTS_JP_IN"),
m_sports_jp_x(*this, "SPORTS_JP_X"),
m_sports_jp_y(*this, "SPORTS_JP_Y"),
m_interval(SPORTS_PAD_JP_INTERVAL)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void sms_sports_pad_jp_device::device_start()
{
m_start_time = machine().time();
m_read_state = 0;
save_item(NAME(m_start_time));
save_item(NAME(m_read_state));
}
//-------------------------------------------------
// sms_peripheral_r - sports pad read
//-------------------------------------------------
UINT8 sms_sports_pad_jp_device::peripheral_r()
{
UINT8 data;
int num_intervals = (machine().time() - m_start_time).as_double() / m_interval.as_double();
m_read_state = num_intervals % 5;
data = m_sports_jp_in->read();
switch (m_read_state)
{
case 0:
// X high nibble
data &= ~0x20; // TL 0
data &= ~0x80; // TR 0
break;
case 1:
// X low nibble
data |= 0x20; // TL 1
data &= ~0x80; // TR 0
break;
case 2:
// Y high nibble
data &= ~0x20; // TL 0
data &= ~0x80; // TR 0
break;
case 3:
// Y low nibble
data |= 0x20; // TL 1
data &= ~0x80; // TR 0
break;
case 4:
// buttons 1 and 2
data = (data & 0x20) >> 5 | (data & 0x80) >> 6 | 0xfc;
data |= 0x20; // TL 1
data |= 0x80; // TR 1
break;
}
return data;
}
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