Imported MM74C922 KBE from MESS. (no whatsnew)

.gitattributes

@@ -837,6 +837,8 @@ src/emu/machine/mc68901.c svneol=native#text/plain
 src/emu/machine/mc68901.h svneol=native#text/plain
 src/emu/machine/microtch.c svneol=native#text/plain
 src/emu/machine/microtch.h svneol=native#text/plain
+src/emu/machine/mm74c922.c svneol=native#text/plain
+src/emu/machine/mm74c922.h svneol=native#text/plain
 src/emu/machine/mos6529.c svneol=native#text/plain
 src/emu/machine/mos6529.h svneol=native#text/plain
 src/emu/machine/msm5832.c svneol=native#text/plain

src/emu/emu.mak

@@ -194,10 +194,11 @@ EMUMACHINEOBJS = \
 	$(EMUMACHINE)/mc146818.o	\
 	$(EMUMACHINE)/mc6852.o		\
 	$(EMUMACHINE)/mc68901.o		\
-	$(EMUMACHINE)/msm5832.o	\
+	$(EMUMACHINE)/mm74c922.o	\
-	$(EMUMACHINE)/msm58321.o	\
 	$(EMUMACHINE)/microtch.o	\
 	$(EMUMACHINE)/mos6529.o		\
+	$(EMUMACHINE)/msm5832.o	\
+	$(EMUMACHINE)/msm58321.o	\
 	$(EMUMACHINE)/msm6242.o		\
 	$(EMUMACHINE)/nmc9306.o		\
 	$(EMUMACHINE)/nvram.o		\

src/emu/machine/mm74c922.c

@@ -0,0 +1,226 @@
+/**********************************************************************
+
+    MM74C922/MM74C923 16/20-Key Encoder emulation
+
+    Copyright MESS Team.
+    Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "mm74c922.h"
+#include "machine/devhelpr.h"
+
+
+
+//**************************************************************************
+//  MACROS / CONSTANTS
+//**************************************************************************
+
+#define LOG 1
+
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type MM74C922 = mm74c922_device_config::static_alloc_device_config;
+const device_type MM74C923 = mm74c922_device_config::static_alloc_device_config;
+
+
+
+//**************************************************************************
+//  DEVICE CONFIGURATION
+//**************************************************************************
+
+GENERIC_DEVICE_CONFIG_SETUP(mm74c922, "MM74C922")
+
+
+//-------------------------------------------------
+//  device_config_complete - perform any
+//  operations now that the configuration is
+//  complete
+//-------------------------------------------------
+
+void mm74c922_device_config::device_config_complete()
+{
+	// inherit a copy of the static data
+	const mm74c922_interface *intf = reinterpret_cast<const mm74c922_interface *>(static_config());
+	if (intf != NULL)
+		*static_cast<mm74c922_interface *>(this) = *intf;
+
+	// or initialize to defaults if none provided
+	else
+	{
+		memset(&m_out_da_func, 0, sizeof(m_out_da_func));
+		memset(&m_in_x1_func, 0, sizeof(m_in_x1_func));
+		memset(&m_in_x2_func, 0, sizeof(m_in_x2_func));
+		memset(&m_in_x3_func, 0, sizeof(m_in_x3_func));
+		memset(&m_in_x4_func, 0, sizeof(m_in_x4_func));
+		memset(&m_in_x5_func, 0, sizeof(m_in_x5_func));
+	}
+}
+
+
+//-------------------------------------------------
+//  static_set_config - configuration helper
+//-------------------------------------------------
+
+void mm74c922_device_config::static_set_config(device_config *device, int max_y)
+{
+	mm74c922_device_config *mm74c922 = downcast<mm74c922_device_config *>(device);
+
+	mm74c922->m_max_y = max_y;
+}
+
+
+
+//**************************************************************************
+//  INLINE HELPERS
+//**************************************************************************
+
+//-------------------------------------------------
+//  change_output_lines - 
+//-------------------------------------------------
+
+inline void mm74c922_device::change_output_lines()
+{
+	if (m_next_da != m_da)
+	{
+		m_da = m_next_da;
+
+		if (LOG) logerror("MM74C922 '%s' Data Available: %u\n", tag(), m_da);
+
+		devcb_call_write_line(&m_out_da_func, m_da);
+	}
+}
+
+
+//-------------------------------------------------
+//  clock_scan_counters - 
+//-------------------------------------------------
+
+inline void mm74c922_device::clock_scan_counters()
+{
+	if (!m_inhibit)
+	{
+		m_x++;
+		m_x &= 0x03;
+	}
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+inline void mm74c922_device::detect_keypress()
+{
+	if (m_inhibit)
+	{
+		UINT8 data = devcb_call_read8(&m_in_x_func[m_x], 0);
+
+		if (BIT(data, m_y))
+		{
+			// key released
+			m_inhibit = 0;
+			m_next_da = 0;
+			m_data = 0xff; // high-Z
+
+			if (LOG) logerror("MM74C922 '%s' Key Released\n", tag());
+		}
+	}
+	else
+	{
+		UINT8 data = devcb_call_read8(&m_in_x_func[m_x], 0);
+
+		for (int y = 0; y < m_config.m_max_y; y++)
+		{
+			if (!BIT(data, y))
+			{
+				// key depressed
+				m_inhibit = 1;
+				m_next_da = 1;
+				m_y = y;
+
+				m_data = (y << 2) | m_x;
+
+				if (LOG) logerror("MM74C922 '%s' Key Depressed: X %u Y %u = %02x\n", tag(), m_x, y, m_data);
+				return;
+			}
+		}
+	}
+}
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  mm74c922_device - constructor
+//-------------------------------------------------
+
+mm74c922_device::mm74c922_device(running_machine &_machine, const mm74c922_device_config &config)
+    : device_t(_machine, config),
+	  m_x(0),
+	  m_y(0),
+	  m_next_da(0),
+      m_config(config)
+{
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void mm74c922_device::device_start()
+{
+	// resolve callbacks
+	devcb_resolve_write_line(&m_out_da_func, &m_config.m_out_da_func, this);
+	devcb_resolve_read8(&m_in_x_func[0], &m_config.m_in_x1_func, this);
+	devcb_resolve_read8(&m_in_x_func[1], &m_config.m_in_x2_func, this);
+	devcb_resolve_read8(&m_in_x_func[2], &m_config.m_in_x3_func, this);
+	devcb_resolve_read8(&m_in_x_func[3], &m_config.m_in_x4_func, this);
+	devcb_resolve_read8(&m_in_x_func[4], &m_config.m_in_x5_func, this);
+
+	// set initial values
+	change_output_lines();
+
+	// allocate timers
+	m_scan_timer = timer_alloc();
+	m_scan_timer->adjust(attotime::zero, 0, attotime::from_hz(50));
+
+	// register for state saving
+	save_item(NAME(m_inhibit));
+	save_item(NAME(m_x));
+	save_item(NAME(m_y));
+	save_item(NAME(m_data));
+	save_item(NAME(m_da));
+	save_item(NAME(m_next_da));
+}
+
+
+//-------------------------------------------------
+//  device_timer - handler timer events
+//-------------------------------------------------
+
+void mm74c922_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+	change_output_lines();
+	clock_scan_counters();
+	detect_keypress();
+}
+
+
+//-------------------------------------------------
+//  data_out_r - 
+//-------------------------------------------------
+
+UINT8 mm74c922_device::data_out_r()
+{
+	if (LOG) logerror("MM74C922 '%s' Data Read: %02x\n", tag(), m_data);
+
+	return m_data;
+}

src/emu/machine/mm74c922.h

@@ -0,0 +1,163 @@
+/**********************************************************************
+
+    MM74C922/MM74C923 16/20-Key Encoder emulation
+
+    Copyright MESS Team.
+    Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+                            _____   _____
+                ROW Y1   1 |*    \_/     | 18  Vcc
+                ROW Y2   2 |             | 17  DATA OUT A
+                ROW Y3   3 |             | 16  DATA OUT B
+                ROW Y4   4 |             | 15  DATA OUT C
+            OSCILLATOR   5 |  MM74C922   | 14  DATA OUT D
+        KEYBOUNCE MASK   6 |             | 13  _OUTPUT ENABLE
+             COLUMN X4   7 |             | 12  DATA AVAILABLE
+             COLUMN X3   8 |             | 11  COLUMN X1
+                   GND   9 |_____________| 10  COLUMN X2
+
+                            _____   _____
+                ROW Y1   1 |*    \_/     | 20  Vcc
+                ROW Y2   2 |             | 19  DATA OUT A
+                ROW Y3   3 |             | 18  DATA OUT B
+                ROW Y4   4 |             | 17  DATA OUT C
+                ROW Y5   5 |  MM74C923   | 16  DATA OUT D
+            OSCILLATOR   6 |             | 15  DATA OUT E
+        KEYBOUNCE MASK   7 |             | 14  _OUTPUT ENABLE
+             COLUMN X4   8 |             | 13  DATA AVAILABLE
+             COLUMN X3   9 |             | 12  COLUMN X1
+                   GND  10 |_____________| 11  COLUMN X2
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __MM74C922__
+#define __MM74C922__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+//  INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_MM74C922_ADD(_tag, _config) \
+	MCFG_DEVICE_ADD(_tag, MM74C922, 0) \
+	MCFG_DEVICE_CONFIG(_config) \
+	mm74c922_device_config::static_set_config(device, 4);
+
+
+#define MCFG_MM74C923_ADD(_tag, _config) \
+	MCFG_DEVICE_ADD(_tag, MM74C923, 0) \
+	MCFG_DEVICE_CONFIG(_config) \
+	mm74c922_device_config::static_set_config(device, 5);
+
+
+#define MM74C922_INTERFACE(name) \
+	const mm74c922_interface (name)=
+
+
+#define MM74C923_INTERFACE(name) \
+	const mm74c922_interface (name)=
+
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> mm74c922_interface
+
+struct mm74c922_interface
+{
+	double				m_cap_osc;
+	double				m_cap_debounce;
+
+	devcb_write_line	m_out_da_func;
+
+	devcb_read8			m_in_x1_func;
+	devcb_read8			m_in_x2_func;
+	devcb_read8			m_in_x3_func;
+	devcb_read8			m_in_x4_func;
+	devcb_read8			m_in_x5_func;
+};
+
+
+// ======================> mm74c922_device_config
+
+class mm74c922_device_config :   public device_config,
+                                 public mm74c922_interface
+{
+    friend class mm74c922_device;
+
+    // construction/destruction
+    mm74c922_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
+
+public:
+    // allocators
+    static device_config *static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
+    virtual device_t *alloc_device(running_machine &machine) const;
+
+	// inline configuration helpers
+	static void static_set_config(device_config *device, int max_y);
+
+protected:
+    // device_config overrides
+    virtual void device_config_complete();
+
+private:
+	int m_max_y;
+};
+
+
+// ======================> mm74c922_device
+
+class mm74c922_device :  public device_t
+{
+    friend class mm74c922_device_config;
+
+    // construction/destruction
+    mm74c922_device(running_machine &_machine, const mm74c922_device_config &_config);
+
+public:
+    UINT8 data_out_r();
+
+protected:
+    // device-level overrides
+    virtual void device_start();
+	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+private:
+	inline void change_output_lines();
+	inline void clock_scan_counters();
+	inline void detect_keypress();
+
+	devcb_resolved_write_line	m_out_da_func;
+	devcb_resolved_read8		m_in_x_func[5];
+
+	int m_inhibit;				// scan counter clock inhibit
+	int m_x;					// currently scanned column
+	int m_y;					// latched row
+
+	UINT8 m_data;				// data latch
+
+	int m_da;					// data available flag
+	int m_next_da;				// next value of data available flag
+
+	// timers
+	emu_timer *m_scan_timer;	// keyboard scan timer
+
+	const mm74c922_device_config &m_config;
+};
+
+
+// device type definition
+extern const device_type MM74C922;
+extern const device_type MM74C923;
+
+
+
+#endif