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https://github.com/holub/mame
synced 2025-05-06 14:25:54 +03:00
Imported MM74C922 KBE from MESS. (no whatsnew)
This commit is contained in:
Curt Coder
parent
a8ce511e1c
commit
06fe09e29b
2
.gitattributes
vendored
2
.gitattributes
vendored
@ -837,6 +837,8 @@ src/emu/machine/mc68901.c svneol=native#text/plain
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src/emu/machine/mc68901.h svneol=native#text/plain
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src/emu/machine/microtch.c svneol=native#text/plain
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src/emu/machine/microtch.h svneol=native#text/plain
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src/emu/machine/mm74c922.c svneol=native#text/plain
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src/emu/machine/mm74c922.h svneol=native#text/plain
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src/emu/machine/mos6529.c svneol=native#text/plain
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src/emu/machine/mos6529.h svneol=native#text/plain
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src/emu/machine/msm5832.c svneol=native#text/plain
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@ -194,10 +194,11 @@ EMUMACHINEOBJS = \
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$(EMUMACHINE)/mc146818.o \
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$(EMUMACHINE)/mc6852.o \
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$(EMUMACHINE)/mc68901.o \
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$(EMUMACHINE)/msm5832.o \
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$(EMUMACHINE)/msm58321.o \
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$(EMUMACHINE)/mm74c922.o \
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$(EMUMACHINE)/microtch.o \
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$(EMUMACHINE)/mos6529.o \
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$(EMUMACHINE)/msm5832.o \
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$(EMUMACHINE)/msm58321.o \
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$(EMUMACHINE)/msm6242.o \
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$(EMUMACHINE)/nmc9306.o \
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$(EMUMACHINE)/nvram.o \
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226
src/emu/machine/mm74c922.c
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226
src/emu/machine/mm74c922.c
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/**********************************************************************
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MM74C922/MM74C923 16/20-Key Encoder emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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#include "mm74c922.h"
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#include "machine/devhelpr.h"
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//**************************************************************************
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// MACROS / CONSTANTS
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//**************************************************************************
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#define LOG 1
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type MM74C922 = mm74c922_device_config::static_alloc_device_config;
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const device_type MM74C923 = mm74c922_device_config::static_alloc_device_config;
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//**************************************************************************
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// DEVICE CONFIGURATION
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//**************************************************************************
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GENERIC_DEVICE_CONFIG_SETUP(mm74c922, "MM74C922")
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//-------------------------------------------------
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// device_config_complete - perform any
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// operations now that the configuration is
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// complete
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//-------------------------------------------------
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void mm74c922_device_config::device_config_complete()
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{
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// inherit a copy of the static data
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const mm74c922_interface *intf = reinterpret_cast<const mm74c922_interface *>(static_config());
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if (intf != NULL)
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*static_cast<mm74c922_interface *>(this) = *intf;
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// or initialize to defaults if none provided
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else
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{
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memset(&m_out_da_func, 0, sizeof(m_out_da_func));
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memset(&m_in_x1_func, 0, sizeof(m_in_x1_func));
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memset(&m_in_x2_func, 0, sizeof(m_in_x2_func));
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memset(&m_in_x3_func, 0, sizeof(m_in_x3_func));
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memset(&m_in_x4_func, 0, sizeof(m_in_x4_func));
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memset(&m_in_x5_func, 0, sizeof(m_in_x5_func));
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}
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}
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//-------------------------------------------------
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// static_set_config - configuration helper
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//-------------------------------------------------
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void mm74c922_device_config::static_set_config(device_config *device, int max_y)
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{
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mm74c922_device_config *mm74c922 = downcast<mm74c922_device_config *>(device);
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mm74c922->m_max_y = max_y;
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}
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//**************************************************************************
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// INLINE HELPERS
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//**************************************************************************
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//-------------------------------------------------
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// change_output_lines -
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//-------------------------------------------------
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inline void mm74c922_device::change_output_lines()
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{
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if (m_next_da != m_da)
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{
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m_da = m_next_da;
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if (LOG) logerror("MM74C922 '%s' Data Available: %u\n", tag(), m_da);
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devcb_call_write_line(&m_out_da_func, m_da);
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}
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}
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//-------------------------------------------------
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// clock_scan_counters -
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//-------------------------------------------------
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inline void mm74c922_device::clock_scan_counters()
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{
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if (!m_inhibit)
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{
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m_x++;
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m_x &= 0x03;
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}
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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inline void mm74c922_device::detect_keypress()
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{
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if (m_inhibit)
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{
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UINT8 data = devcb_call_read8(&m_in_x_func[m_x], 0);
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if (BIT(data, m_y))
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{
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// key released
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m_inhibit = 0;
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m_next_da = 0;
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m_data = 0xff; // high-Z
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if (LOG) logerror("MM74C922 '%s' Key Released\n", tag());
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}
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}
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else
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{
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UINT8 data = devcb_call_read8(&m_in_x_func[m_x], 0);
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for (int y = 0; y < m_config.m_max_y; y++)
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{
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if (!BIT(data, y))
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{
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// key depressed
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m_inhibit = 1;
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m_next_da = 1;
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m_y = y;
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m_data = (y << 2) | m_x;
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if (LOG) logerror("MM74C922 '%s' Key Depressed: X %u Y %u = %02x\n", tag(), m_x, y, m_data);
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return;
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}
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}
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}
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// mm74c922_device - constructor
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//-------------------------------------------------
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mm74c922_device::mm74c922_device(running_machine &_machine, const mm74c922_device_config &config)
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: device_t(_machine, config),
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m_x(0),
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m_y(0),
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m_next_da(0),
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m_config(config)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void mm74c922_device::device_start()
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{
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// resolve callbacks
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devcb_resolve_write_line(&m_out_da_func, &m_config.m_out_da_func, this);
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devcb_resolve_read8(&m_in_x_func[0], &m_config.m_in_x1_func, this);
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devcb_resolve_read8(&m_in_x_func[1], &m_config.m_in_x2_func, this);
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devcb_resolve_read8(&m_in_x_func[2], &m_config.m_in_x3_func, this);
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devcb_resolve_read8(&m_in_x_func[3], &m_config.m_in_x4_func, this);
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devcb_resolve_read8(&m_in_x_func[4], &m_config.m_in_x5_func, this);
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// set initial values
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change_output_lines();
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// allocate timers
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m_scan_timer = timer_alloc();
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m_scan_timer->adjust(attotime::zero, 0, attotime::from_hz(50));
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// register for state saving
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save_item(NAME(m_inhibit));
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save_item(NAME(m_x));
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save_item(NAME(m_y));
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save_item(NAME(m_data));
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save_item(NAME(m_da));
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save_item(NAME(m_next_da));
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}
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//-------------------------------------------------
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// device_timer - handler timer events
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//-------------------------------------------------
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void mm74c922_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
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{
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change_output_lines();
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clock_scan_counters();
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detect_keypress();
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}
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//-------------------------------------------------
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// data_out_r -
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//-------------------------------------------------
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UINT8 mm74c922_device::data_out_r()
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{
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if (LOG) logerror("MM74C922 '%s' Data Read: %02x\n", tag(), m_data);
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return m_data;
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}
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163
src/emu/machine/mm74c922.h
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163
src/emu/machine/mm74c922.h
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@ -0,0 +1,163 @@
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/**********************************************************************
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MM74C922/MM74C923 16/20-Key Encoder emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************
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_____ _____
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ROW Y1 1 |* \_/ | 18 Vcc
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ROW Y2 2 | | 17 DATA OUT A
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ROW Y3 3 | | 16 DATA OUT B
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ROW Y4 4 | | 15 DATA OUT C
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OSCILLATOR 5 | MM74C922 | 14 DATA OUT D
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KEYBOUNCE MASK 6 | | 13 _OUTPUT ENABLE
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COLUMN X4 7 | | 12 DATA AVAILABLE
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COLUMN X3 8 | | 11 COLUMN X1
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GND 9 |_____________| 10 COLUMN X2
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_____ _____
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ROW Y1 1 |* \_/ | 20 Vcc
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ROW Y2 2 | | 19 DATA OUT A
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ROW Y3 3 | | 18 DATA OUT B
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ROW Y4 4 | | 17 DATA OUT C
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ROW Y5 5 | MM74C923 | 16 DATA OUT D
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OSCILLATOR 6 | | 15 DATA OUT E
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KEYBOUNCE MASK 7 | | 14 _OUTPUT ENABLE
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COLUMN X4 8 | | 13 DATA AVAILABLE
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COLUMN X3 9 | | 12 COLUMN X1
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GND 10 |_____________| 11 COLUMN X2
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**********************************************************************/
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#pragma once
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#ifndef __MM74C922__
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#define __MM74C922__
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#include "emu.h"
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//**************************************************************************
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// INTERFACE CONFIGURATION MACROS
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//**************************************************************************
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#define MCFG_MM74C922_ADD(_tag, _config) \
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MCFG_DEVICE_ADD(_tag, MM74C922, 0) \
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MCFG_DEVICE_CONFIG(_config) \
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mm74c922_device_config::static_set_config(device, 4);
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#define MCFG_MM74C923_ADD(_tag, _config) \
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MCFG_DEVICE_ADD(_tag, MM74C923, 0) \
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MCFG_DEVICE_CONFIG(_config) \
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mm74c922_device_config::static_set_config(device, 5);
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#define MM74C922_INTERFACE(name) \
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const mm74c922_interface (name)=
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#define MM74C923_INTERFACE(name) \
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const mm74c922_interface (name)=
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> mm74c922_interface
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struct mm74c922_interface
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{
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double m_cap_osc;
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double m_cap_debounce;
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devcb_write_line m_out_da_func;
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devcb_read8 m_in_x1_func;
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devcb_read8 m_in_x2_func;
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devcb_read8 m_in_x3_func;
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devcb_read8 m_in_x4_func;
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devcb_read8 m_in_x5_func;
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};
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// ======================> mm74c922_device_config
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class mm74c922_device_config : public device_config,
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public mm74c922_interface
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{
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friend class mm74c922_device;
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// construction/destruction
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mm74c922_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
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public:
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// allocators
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static device_config *static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
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virtual device_t *alloc_device(running_machine &machine) const;
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// inline configuration helpers
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static void static_set_config(device_config *device, int max_y);
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protected:
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// device_config overrides
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virtual void device_config_complete();
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private:
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int m_max_y;
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};
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// ======================> mm74c922_device
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class mm74c922_device : public device_t
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{
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friend class mm74c922_device_config;
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// construction/destruction
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mm74c922_device(running_machine &_machine, const mm74c922_device_config &_config);
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public:
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UINT8 data_out_r();
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protected:
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// device-level overrides
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virtual void device_start();
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virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
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private:
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inline void change_output_lines();
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inline void clock_scan_counters();
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inline void detect_keypress();
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devcb_resolved_write_line m_out_da_func;
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devcb_resolved_read8 m_in_x_func[5];
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int m_inhibit; // scan counter clock inhibit
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int m_x; // currently scanned column
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int m_y; // latched row
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UINT8 m_data; // data latch
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int m_da; // data available flag
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int m_next_da; // next value of data available flag
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// timers
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emu_timer *m_scan_timer; // keyboard scan timer
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const mm74c922_device_config &m_config;
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};
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// device type definition
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extern const device_type MM74C922;
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extern const device_type MM74C923;
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#endif
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