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Diffstat (limited to 'src/devices/bus/sms_ctrl/sports.cpp')
-rw-r--r--src/devices/bus/sms_ctrl/sports.cpp194
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diff --git a/src/devices/bus/sms_ctrl/sports.cpp b/src/devices/bus/sms_ctrl/sports.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/**********************************************************************
+
+ Sega Master System "Sports Pad" (US model) emulation
+
+**********************************************************************/
+
+// The games designed for the US model of the Sports Pad controller use the
+// TH line of the controller port as output, to select which nibble, of the
+// two axis bytes, will be read at a time. The Japanese cartridge Sports Pad
+// Soccer uses a different mode, because the Sega Mark III lacks TH output, so
+// there is a different Sports Pad model released in Japan (see sportsjp.c).
+
+// It was discovered that games designed for the Paddle Controller, released
+// in Japan, switch to a mode incompatible with the original Paddle when
+// detect the system region as Export. Similar to how the US model of the
+// Sports Pad works, that mode uses the TH line as output to select which
+// nibble of the X axis will be read. So, on an Export console version, paddle
+// games are somewhat playable with the US Sport Pad model, though it needs to
+// be used inverted and the trackball needs to be moved slowly, else the
+// software for the paddle think it's moving backward.
+// See http://mametesters.org/view.php?id=5872 for discussion.
+
+#include "sports.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type SMS_SPORTS_PAD = &device_creator<sms_sports_pad_device>;
+
+// time interval not verified
+#define SPORTS_PAD_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/512)
+
+
+void sms_sports_pad_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ switch (id)
+ {
+ case TIMER_SPORTSPAD:
+ // values for x and y axis need to be resetted for Sports Pad games, but
+ // are not resetted for paddle games, so it was assumed the reset occurs
+ // only when this timer fires after the read state reached maximum value.
+ if (m_read_state == 3)
+ {
+ m_x_axis_reset_value = m_sports_x->read();
+ m_y_axis_reset_value = m_sports_y->read();
+ }
+ else
+ {
+ // set to maximum value, so it wraps to 0 at next increment
+ m_read_state = 3;
+ }
+
+ break;
+ default:
+ assert_always(FALSE, "Unknown id in sms_sports_pad_device::device_timer");
+ }
+}
+
+
+CUSTOM_INPUT_MEMBER( sms_sports_pad_device::th_pin_r )
+{
+ return m_last_data;
+}
+
+
+INPUT_CHANGED_MEMBER( sms_sports_pad_device::th_pin_w )
+{
+ m_read_state = (m_read_state + 1) & 3;
+ m_sportspad_timer->adjust(m_interval);
+ m_last_data = newval;
+}
+
+
+CUSTOM_INPUT_MEMBER( sms_sports_pad_device::dir_pins_r )
+{
+ UINT8 data = 0;
+
+ switch (m_read_state)
+ {
+ case 0:
+ data = (m_sports_x->read() - m_x_axis_reset_value) >> 4;
+ break;
+ case 1:
+ data = (m_sports_x->read() - m_x_axis_reset_value);
+ break;
+ case 2:
+ data = (m_sports_y->read() - m_y_axis_reset_value) >> 4;
+ break;
+ case 3:
+ data = (m_sports_y->read() - m_y_axis_reset_value);
+ break;
+ }
+
+ // The returned value is inverted due to IP_ACTIVE_LOW mapping.
+ return ~(data & 0x0f);
+}
+
+
+static INPUT_PORTS_START( sms_sports_pad )
+ PORT_START("SPORTS_IN")
+ PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_sports_pad_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_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_sports_pad_device, th_pin_r, NULL)
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON2 ) // TR (Button 2)
+
+ PORT_START("SPORTS_OUT")
+ PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_UNUSED ) // Directional pins
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) // Vcc
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED ) // TL (Button 1)
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_OUTPUT ) PORT_CHANGED_MEMBER(DEVICE_SELF, sms_sports_pad_device, th_pin_w, NULL)
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED ) // TR (Button 2)
+
+ PORT_START("SPORTS_X") /* Sports Pad X axis */
+ PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(40) PORT_REVERSE
+
+ PORT_START("SPORTS_Y") /* Sports Pad Y axis */
+ PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(40) PORT_REVERSE
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor sms_sports_pad_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( sms_sports_pad );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// sms_sports_pad_device - constructor
+//-------------------------------------------------
+
+sms_sports_pad_device::sms_sports_pad_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, SMS_SPORTS_PAD, "Sega SMS Sports Pad US", tag, owner, clock, "sms_sports_pad", __FILE__),
+ device_sms_control_port_interface(mconfig, *this),
+ m_sports_in(*this, "SPORTS_IN"),
+ m_sports_out(*this, "SPORTS_OUT"),
+ m_sports_x(*this, "SPORTS_X"),
+ m_sports_y(*this, "SPORTS_Y"),
+ m_read_state(0),
+ m_last_data(0),
+ m_x_axis_reset_value(0x80), // value 0x80 helps when start playing paddle games.
+ m_y_axis_reset_value(0x80),
+ m_interval(SPORTS_PAD_INTERVAL)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void sms_sports_pad_device::device_start()
+{
+ m_sportspad_timer = timer_alloc(TIMER_SPORTSPAD);
+
+ save_item(NAME(m_read_state));
+ save_item(NAME(m_last_data));
+ save_item(NAME(m_x_axis_reset_value));
+ save_item(NAME(m_y_axis_reset_value));
+}
+
+
+//-------------------------------------------------
+// sms_peripheral_r - sports pad read
+//-------------------------------------------------
+
+UINT8 sms_sports_pad_device::peripheral_r()
+{
+ return m_sports_in->read();
+}
+
+
+//-------------------------------------------------
+// sms_peripheral_w - sports pad write
+//-------------------------------------------------
+
+void sms_sports_pad_device::peripheral_w(UINT8 data)
+{
+ m_sports_out->write(data);
+}