New device: SN54/74166 8-Bit Parallel-In/Serial-Out Shift Register

scripts/src/machine.lua

@@ -391,6 +391,18 @@ if (MACHINES["TTL74161"]~=null) then
 	}
 end
 
+---------------------------------------------------
+--
+--@src/devices/machine/74166.h,MACHINES["TTL74166"] = true
+---------------------------------------------------
+
+if (MACHINES["TTL74166"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/machine/74166.cpp",
+		MAME_DIR .. "src/devices/machine/74166.h",
+	}
+end
+
 ---------------------------------------------------
 --
 --@src/devices/machine/74175.h,MACHINES["TTL74175"] = true

src/devices/machine/74166.cpp

@@ -0,0 +1,128 @@
+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+    SN54/74166
+
+    8-Bit Parallel-In/Serial-Out Shift Register
+
+***************************************************************************/
+
+#include "emu.h"
+#include "74166.h"
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(TTL166, ttl166_device, "ttl166", "SN54/74166")
+
+//-------------------------------------------------
+//  machine_config_additions - device-specific
+//  machine configurations
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( ttl166 )
+	MCFG_TIMER_DRIVER_ADD("timer", ttl166_device, qh_output)
+MACHINE_CONFIG_END
+
+machine_config_constructor ttl166_device::device_mconfig_additions() const
+{
+	return MACHINE_CONFIG_NAME( ttl166 );
+}
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  ttl153_device - constructor
+//-------------------------------------------------
+
+ttl166_device::ttl166_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+	device_t(mconfig, TTL166, tag, owner, clock),
+	m_timer(*this, "timer"),
+	m_data_cb(*this), m_qh_cb(*this),
+	m_data(0x00),
+	m_ser(0), m_clk(0), m_shld(0)
+{
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void ttl166_device::device_start()
+{
+	// resolve callbacks
+	m_data_cb.resolve_safe(0x00);
+	m_qh_cb.resolve_safe();
+
+	// register for save states
+	save_item(NAME(m_data));
+	save_item(NAME(m_ser));
+	save_item(NAME(m_clk));
+	save_item(NAME(m_shld));
+}
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void ttl166_device::device_reset()
+{
+	m_data = 0x00;
+	m_ser = 0;
+	m_clk = 0;
+	m_shld = 0;
+}
+
+
+//**************************************************************************
+//  IMPLEMENTATION
+//**************************************************************************
+
+TIMER_DEVICE_CALLBACK_MEMBER( ttl166_device::qh_output )
+{
+	m_qh_cb(param);
+}
+
+
+//**************************************************************************
+//  INTERFACE
+//**************************************************************************
+
+WRITE_LINE_MEMBER( ttl166_device::serial_w )
+{
+	m_ser = state;
+}
+
+WRITE_LINE_MEMBER( ttl166_device::clock_w )
+{
+	if (m_clk == 0 && state == 1)
+	{
+		if (m_shld)
+		{
+			// shift next bit
+			m_data <<= 1;
+			m_data |= m_ser;
+		}
+		else
+		{
+			// load external data
+			m_data = m_data_cb(0);
+		}
+
+		// we need to delay the output a bit to allow for serial input
+		m_timer->adjust(attotime::from_nsec(25), BIT(m_data, 7));
+	}
+
+	m_clk = state;
+}
+
+WRITE_LINE_MEMBER( ttl166_device::shift_load_w )
+{
+	m_shld = state;
+}

src/devices/machine/74166.h

@@ -0,0 +1,88 @@
+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+    SN54/74166
+
+    8-Bit Parallel-In/Serial-Out Shift Register
+
+               ___ ___
+       SER  1 |*  u   | 16  VCC
+         A  2 |       | 15  SH//LD
+         B  3 |       | 14  H
+         C  4 |       | 13  QH
+         D  5 |       | 12  G
+   CLK INH  6 |       | 11  F
+       CLK  7 |       | 10  E
+       GND  8 |_______|  9  /CLR
+
+***************************************************************************/
+
+#ifndef MAME_DEVICES_MACHINE_74166_H
+#define MAME_DEVICES_MACHINE_74166_H
+
+#pragma once
+
+
+//**************************************************************************
+//  INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_TTL166_ADD(_tag) \
+	MCFG_DEVICE_ADD(_tag, TTL166, 0)
+
+#define MCFG_TTL166_DATA_CB(_devcb) \
+	devcb = &ttl166_device::set_data_callback(*device, DEVCB_##_devcb);
+
+#define MCFG_TTL166_QH_CB(_devcb) \
+	devcb = &ttl166_device::set_qh_callback(*device, DEVCB_##_devcb);
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+class ttl166_device : public device_t
+{
+public:
+	// construction/destruction
+	ttl166_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+	// configuration
+	template <class Object> static devcb_base &set_data_callback(device_t &device, Object &&cb)
+		{ return downcast<ttl166_device &>(device).m_data_cb.set_callback(std::forward<Object>(cb)); }
+
+	template <class Object> static devcb_base &set_qh_callback(device_t &device, Object &&cb)
+		{ return downcast<ttl166_device &>(device).m_qh_cb.set_callback(std::forward<Object>(cb)); }
+
+	DECLARE_WRITE_LINE_MEMBER(serial_w);
+	DECLARE_WRITE_LINE_MEMBER(clock_w);
+	DECLARE_WRITE_LINE_MEMBER(shift_load_w);
+
+	TIMER_DEVICE_CALLBACK_MEMBER(qh_output);
+
+protected:
+	// device-level overrides
+	virtual machine_config_constructor device_mconfig_additions() const override;
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+private:
+	required_device<timer_device> m_timer;
+
+	// callbacks
+	devcb_read8 m_data_cb;
+	devcb_write_line m_qh_cb;
+
+	// state
+	uint8_t m_data;
+	int m_ser;
+	int m_clk;
+	int m_shld;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(TTL166, ttl166_device)
+
+#endif // MAME_DEVICES_MACHINE_74166_H