(MESS) sms.c: Added support for Sega Graphic Board input. (nw)

.gitattributes

@@ -1517,6 +1517,8 @@ src/emu/bus/sega8/rom.c svneol=native#text/plain
 src/emu/bus/sega8/rom.h svneol=native#text/plain
 src/emu/bus/sega8/sega8_slot.c svneol=native#text/plain
 src/emu/bus/sega8/sega8_slot.h svneol=native#text/plain
+src/emu/bus/sms_ctrl/graphic.c svneol=native#text/plain
+src/emu/bus/sms_ctrl/graphic.h svneol=native#text/plain
 src/emu/bus/sms_ctrl/joypad.c svneol=native#text/plain
 src/emu/bus/sms_ctrl/joypad.h svneol=native#text/plain
 src/emu/bus/sms_ctrl/lphaser.c svneol=native#text/plain

src/emu/bus/sms_ctrl/graphic.c

@@ -0,0 +1,158 @@
+/**********************************************************************
+
+    Sega Master System "Graphic Board" emulation
+
+    Copyright MESS Team.
+    Visit http://mamedev.org for licensing and usage restrictions.
+
+I/O 3f write | this method
+        0x20 | 0x7f
+        0x00 | 0x3f
+        0x30 | 0xff
+   
+Typical sequence:
+- 3f write 0x20
+- read dc
+- 3f write 0x00
+- read dc    
+- 3f write 0x20
+- read dc
+- 3f write 0x30
+Suspect from kind of counter that is reset by a 0x30 write to I/O port 0x3f.
+Once reset reads from i/O port dc expect to see 0xE0.
+And then any write with differing bits goes through several internal I/O ports 
+with the first port being the one with the buttons
+
+In the reset/start state the lower four/five bits are 0.
+Then a nibble is read containing the buttons (active low)
+Then 2 nibbles are read to form a byte (first high nibble, then low nibble) indicating
+whether the pen is on the graphic board, a value of FD, FE, or FF used for this. For
+any other value the following 2 bytes are not read.
+Then 2 nibbles are read to form a byte containing the absolute X coordinate.
+THen 2 nibbles are read to form a byte containing the absolute Y coordiante.
+
+**********************************************************************/
+
+#include "graphic.h"
+
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type SMS_GRAPHIC = &device_creator<sms_graphic_device>;
+
+
+static INPUT_PORTS_START( sms_graphic )
+    PORT_START("BUTTONS")
+    PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 ) // MENU
+    PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON2 ) // DO
+    PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON3 ) // PEN
+    PORT_BIT( 0xf8, IP_ACTIVE_LOW, IPT_UNUSED ) 
+
+	PORT_START("X")
+	PORT_BIT( 0xff, 0x00, IPT_LIGHTGUN_X) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(50) PORT_KEYDELTA(15)
+
+	PORT_START("Y")
+	PORT_BIT( 0xff, 0x00, IPT_LIGHTGUN_Y) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(50) PORT_KEYDELTA(15)
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+//  input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor sms_graphic_device::device_input_ports() const
+{
+	return INPUT_PORTS_NAME( sms_graphic );
+}
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  sms_graphic_device - constructor
+//-------------------------------------------------
+
+sms_graphic_device::sms_graphic_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+	: device_t(mconfig, SMS_GRAPHIC, "Graphic Board", tag, owner, clock, "sms_joypad", __FILE__)
+	, device_sms_control_port_interface(mconfig, *this)
+	, m_buttons(*this, "BUTTONS")
+	, m_x(*this, "X")
+	, m_y(*this, "Y")
+	, m_index(0)
+	, m_previous_write(0xff)
+	, m_pressure(0xfd)
+{
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void sms_graphic_device::device_start()
+{
+	save_item(NAME(m_index));
+	save_item(NAME(m_previous_write));
+}
+
+
+//-------------------------------------------------
+//  sms_peripheral_r - joypad read
+//-------------------------------------------------
+
+UINT8 sms_graphic_device::peripheral_r()
+{
+	switch (m_index)
+	{
+		case 0:     // Initial state / "I am a board"
+			// If any regular button is pressed raise/lower TL ?
+//			if ((m_buttons->read() & 0x07) != 0x07)
+//				return 0xf0;
+			return 0xd0;
+
+		case 1:    // Read buttons (active low)
+			return m_buttons->read();
+
+		case 2:    // Some thing only FD, FE, and FF cause the other values to be read
+			return m_pressure >> 4;
+
+		case 3:
+			return m_pressure & 0x0f;
+
+		case 4:    // High nibble X?
+			return m_x->read() >> 4;
+
+		case 5:    // Low nibble X?
+			return m_x->read() & 0x0f;
+
+		case 6:   // High nibble Y?
+			return m_y->read() >> 4;
+
+		case 7:   // Low Nibble Y?
+			return m_y->read() & 0x0f;
+	}
+
+	return 0xff;
+}
+
+void sms_graphic_device::peripheral_w(UINT8 data)
+{
+	// Check for toggle on TH/TL
+	if ((data ^ m_previous_write) & 0xc0)
+	{
+		m_index++;
+	}
+
+	// If TR is high, restart
+	if (data & 0x80)
+	{
+		m_index = 0;
+	}
+
+	m_previous_write = data;
+}
+

src/emu/bus/sms_ctrl/graphic.h

@@ -0,0 +1,60 @@
+/**********************************************************************
+
+    Sega Master System "Graphic Board" emulation
+
+    Copyright MESS Team.
+    Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __SMS_GRAPHIC__
+#define __SMS_GRAPHIC__
+
+
+#include "emu.h"
+#include "smsctrl.h"
+
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> sms_graphic_device
+
+class sms_graphic_device : public device_t,
+							public device_sms_control_port_interface
+{
+public:
+	// construction/destruction
+	sms_graphic_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+	// optional information overrides
+	virtual ioport_constructor device_input_ports() const;
+
+protected:
+	// device-level overrides
+	virtual void device_start();
+
+	// device_sms_control_port_interface overrides
+	virtual UINT8 peripheral_r();
+	virtual void peripheral_w(UINT8 data);
+
+private:
+	required_ioport m_buttons;
+	required_ioport m_x;
+	required_ioport m_y;
+
+	int m_index;
+	UINT8 m_previous_write;
+	UINT8 m_pressure;
+};
+
+
+// device type definition
+extern const device_type SMS_GRAPHIC;
+
+
+#endif

src/emu/bus/sms_ctrl/smsctrl.c

@@ -16,6 +16,7 @@
 #include "sportsjp.h"
 #include "rfu.h"
 #include "multitap.h"
+#include "graphic.h"
 
 
 
@@ -129,4 +130,5 @@ SLOT_INTERFACE_START( sms_control_port_devices )
 	SLOT_INTERFACE("sportspadjp", SMS_SPORTS_PAD_JP)
 	SLOT_INTERFACE("rapidfire", SMS_RAPID_FIRE)
 	SLOT_INTERFACE("multitap", SMS_MULTITAP)
+	SLOT_INTERFACE("graphic", SMS_GRAPHIC)
 SLOT_INTERFACE_END