mirror of
https://github.com/holub/mame
synced 2025-05-12 00:58:53 +03:00
Imported MC6852 SSDA from MESS. (no whatsnew)
This commit is contained in:
Curt Coder
parent
5770771c02
commit
21f309929e
2
.gitattributes
vendored
2
.gitattributes
vendored
@ -821,6 +821,8 @@ src/emu/machine/mb87078.c svneol=native#text/plain
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src/emu/machine/mb87078.h svneol=native#text/plain
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src/emu/machine/mc146818.c svneol=native#text/plain
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src/emu/machine/mc146818.h svneol=native#text/plain
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src/emu/machine/mc6852.c svneol=native#text/plain
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src/emu/machine/mc6852.h svneol=native#text/plain
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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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@ -188,6 +188,7 @@ EMUMACHINEOBJS = \
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$(EMUMACHINE)/mb3773.o \
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$(EMUMACHINE)/mb87078.o \
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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)/microtch.o \
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$(EMUMACHINE)/msm6242.o \
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385
src/emu/machine/mc6852.c
Normal file
385
src/emu/machine/mc6852.c
Normal file
@ -0,0 +1,385 @@
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/**********************************************************************
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Motorola MC6852 Synchronous Serial Data Adapter 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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TODO:
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- FIFO
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- receive
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- transmit
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- parity
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- 1-sync-character mode
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- 2-sync-character mode
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- external sync mode
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- interrupts
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*/
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#include "emu.h"
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#include "mc6852.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 0
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#define S_RDA 0x01
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#define S_TDRA 0x02
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#define S_DCD 0x04
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#define S_CTS 0x08
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#define S_TUF 0x10
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#define S_RX_OVRN 0x20
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#define S_PE 0x40
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#define S_IRQ 0x80
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#define C1_RX_RS 0x01
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#define C1_TX_RS 0x02
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#define C1_STRIP_SYNC 0x04
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#define C1_CLEAR_SYNC 0x08
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#define C1_TIE 0x10
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#define C1_RIE 0x20
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#define C1_AC_MASK 0xc0
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#define C1_AC_C2 0x00
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#define C1_AC_C3 0x40
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#define C1_AC_SYNC 0x80
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#define C1_AC_TX_FIFO 0xc0
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#define C2_PC1 0x01
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#define C2_PC2 0x02
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#define C2_1_2_BYTE 0x04
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#define C2_WS_MASK 0x38
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#define C2_WS_6_E 0x00
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#define C2_WS_6_O 0x08
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#define C2_WS_7 0x10
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#define C2_WS_8 0x18
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#define C2_WS_7_E 0x20
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#define C2_WS_7_O 0x28
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#define C2_WS_8_E 0x30
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#define C2_WS_8_O 0x38
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#define C2_TX_SYNC 0x40
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#define C2_EIE 0x80
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#define C3_E_I_SYNC 0x01
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#define C3_1_2_SYNC 0x02
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#define C3_CLEAR_CTS 0x04
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#define C3_CTUF 0x08
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//**************************************************************************
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// GLOBAL VARIABLES
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//**************************************************************************
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// devices
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const device_type MC6852 = mc6852_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(mc6852, "MC6852")
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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 mc6852_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 mc6852_interface *intf = reinterpret_cast<const mc6852_interface *>(static_config());
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if (intf != NULL)
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*static_cast<mc6852_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_in_rx_data_func, 0, sizeof(m_in_rx_data_func));
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memset(&m_out_tx_data_func, 0, sizeof(m_out_tx_data_func));
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memset(&m_out_irq_func, 0, sizeof(m_out_irq_func));
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memset(&m_in_cts_func, 0, sizeof(m_in_cts_func));
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memset(&m_in_dcd_func, 0, sizeof(m_in_dcd_func));
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memset(&m_out_sm_dtr_func, 0, sizeof(m_out_sm_dtr_func));
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memset(&m_out_tuf_func, 0, sizeof(m_out_tuf_func));
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}
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}
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//**************************************************************************
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// INLINE HELPERS
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//**************************************************************************
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inline void mc6852_device::receive()
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{
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}
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inline void mc6852_device::transmit()
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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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// mc6852_device - constructor
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//-------------------------------------------------
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mc6852_device::mc6852_device(running_machine &_machine, const mc6852_device_config &config)
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: device_t(_machine, config),
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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 mc6852_device::device_start()
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{
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// resolve callbacks
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devcb_resolve_read_line(&m_in_rx_data_func, &m_config.m_in_rx_data_func, this);
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devcb_resolve_write_line(&m_out_tx_data_func, &m_config.m_out_tx_data_func, this);
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devcb_resolve_write_line(&m_out_irq_func, &m_config.m_out_irq_func, this);
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devcb_resolve_read_line(&m_in_cts_func, &m_config.m_in_cts_func, this);
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devcb_resolve_read_line(&m_in_dcd_func, &m_config.m_in_dcd_func, this);
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devcb_resolve_write_line(&m_out_sm_dtr_func, &m_config.m_out_sm_dtr_func, this);
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devcb_resolve_write_line(&m_out_tuf_func, &m_config.m_out_tuf_func, this);
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if (m_config.m_rx_clock > 0)
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{
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m_rx_timer = timer_alloc(TIMER_RX);
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m_rx_timer->adjust(attotime::zero, 0, attotime::from_hz(m_config.m_rx_clock));
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}
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if (m_config.m_tx_clock > 0)
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{
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m_tx_timer = timer_alloc(TIMER_TX);
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m_tx_timer->adjust(attotime::zero, 0, attotime::from_hz(m_config.m_tx_clock));
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}
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// register for state saving
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save_item(NAME(m_status));
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save_item(NAME(m_cr));
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save_item(NAME(m_scr));
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save_item(NAME(m_rx_fifo));
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save_item(NAME(m_tx_fifo));
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save_item(NAME(m_tdr));
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save_item(NAME(m_tsr));
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save_item(NAME(m_rdr));
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save_item(NAME(m_rsr));
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save_item(NAME(m_cts));
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save_item(NAME(m_dcd));
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save_item(NAME(m_sm_dtr));
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save_item(NAME(m_tuf));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void mc6852_device::device_reset()
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{
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/* set receiver shift register to all 1's */
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m_rsr = 0xff;
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/* reset and inhibit receiver/transmitter sections */
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m_cr[0] |= (C1_TX_RS | C1_RX_RS);
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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 mc6852_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
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{
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switch (id)
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{
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case TIMER_RX:
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receive();
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break;
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case TIMER_TX:
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transmit();
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break;
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}
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}
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//-------------------------------------------------
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// read -
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//-------------------------------------------------
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READ8_MEMBER( mc6852_device::read )
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{
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UINT8 data = 0;
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if (BIT(offset, 0))
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{
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/* receive data FIFO */
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}
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else
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{
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/* status */
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data = m_status;
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}
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return data;
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}
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//-------------------------------------------------
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// write -
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//-------------------------------------------------
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WRITE8_MEMBER( mc6852_device::write )
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{
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if (BIT(offset, 0))
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{
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switch (m_cr[0] & C1_AC_MASK)
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{
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case C1_AC_C2:
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/* control 2 */
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m_cr[1] = data;
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break;
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case C1_AC_C3:
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/* control 3 */
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m_cr[2] = data;
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break;
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case C1_AC_SYNC:
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/* sync code */
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m_scr = data;
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break;
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case C1_AC_TX_FIFO:
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/* transmit data FIFO */
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break;
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}
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}
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else
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{
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/* receiver reset */
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if (data & C1_RX_RS)
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{
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/* When Rx Rs is set, it clears the receiver
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control logic, sync logic, error logic, Rx Data FIFO Control,
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Parity Error status bit, and DCD interrupt. The Receiver Shift
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Register is set to ones.
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*/
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if (LOG) logerror("MC6852 '%s' Receiver Reset\n", tag());
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m_status &= ~(S_RX_OVRN | S_PE | S_DCD | S_RDA);
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m_rsr = 0xff;
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}
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/* transmitter reset */
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if (data & C1_TX_RS)
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{
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/* When Tx Rs is set, it clears the transmitter
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control section, Transmitter Shift Register, Tx Data FIFO
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Control (the Tx Data FIFO can be reloaded after one E clock
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pulse), the Transmitter Underflow status bit, and the CTS interrupt,
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and inhibits the TDRA status bit (in the one-sync-character
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and two-sync-character modes).*/
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if (LOG) logerror("MC6852 '%s' Transmitter Reset\n", tag());
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m_status &= ~(S_TUF | S_CTS | S_TDRA);
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}
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if (LOG)
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{
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if (data & C1_STRIP_SYNC) logerror("MC6852 '%s' Strip Synchronization Characters\n", tag());
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if (data & C1_CLEAR_SYNC) logerror("MC6852 '%s' Clear Synchronization\n", tag());
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}
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m_cr[0] = data;
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}
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}
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//-------------------------------------------------
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// rx_clk_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( mc6852_device::rx_clk_w )
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{
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if (state) receive();
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}
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//-------------------------------------------------
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// tx_clk_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( mc6852_device::tx_clk_w )
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{
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if (state) transmit();
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}
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//-------------------------------------------------
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// cts_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( mc6852_device::cts_w )
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{
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m_cts = state;
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}
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//-------------------------------------------------
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// dcd_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( mc6852_device::dcd_w )
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{
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m_dcd = state;
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}
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//-------------------------------------------------
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// sm_dtr_r -
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//-------------------------------------------------
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READ_LINE_MEMBER( mc6852_device::sm_dtr_r )
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{
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return m_sm_dtr;
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}
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//-------------------------------------------------
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// tuf_r -
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//-------------------------------------------------
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READ_LINE_MEMBER( mc6852_device::tuf_r )
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{
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return m_tuf;
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}
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164
src/emu/machine/mc6852.h
Normal file
164
src/emu/machine/mc6852.h
Normal file
@ -0,0 +1,164 @@
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/**********************************************************************
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|
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Motorola MC6852 Synchronous Serial Data Adapter emulation
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|
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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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Vss 1 |* \_/ | 24 _CTS
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Rx DATA 2 | | 23 _DCD
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Rx CLK 3 | | 22 D0
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Tx CLK 4 | | 21 D1
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SM/_DTR 5 | | 20 D2
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Tx DATA 6 | MC6852 | 19 D3
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_IRQ 7 | | 18 D4
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TUF 8 | | 17 D5
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_RESET 9 | | 16 D6
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_CS 9 | | 15 D7
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RS 9 | | 14 E
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Vcc 10 |_____________| 13 R/_W
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**********************************************************************/
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#pragma once
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#ifndef __MC6852__
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#define __MC6852__
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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_MC6852_ADD(_tag, _clock, _config) \
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MCFG_DEVICE_ADD((_tag), MC6852, _clock) \
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MCFG_DEVICE_CONFIG(_config)
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#define MC6852_INTERFACE(name) \
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const mc6852_interface (name) =
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> mc6852_interface
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struct mc6852_interface
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{
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UINT32 m_rx_clock;
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UINT32 m_tx_clock;
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devcb_read_line m_in_rx_data_func;
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devcb_write_line m_out_tx_data_func;
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devcb_write_line m_out_irq_func;
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devcb_read_line m_in_cts_func;
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devcb_read_line m_in_dcd_func;
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devcb_write_line m_out_sm_dtr_func;
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devcb_write_line m_out_tuf_func;
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};
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||||
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||||
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// ======================> mc6852_device_config
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class mc6852_device_config : public device_config,
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public mc6852_interface
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{
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friend class mc6852_device;
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// construction/destruction
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mc6852_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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protected:
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// device_config overrides
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virtual void device_config_complete();
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};
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||||
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||||
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// ======================> mc6852_device
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||||
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class mc6852_device : public device_t
|
||||
{
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||||
friend class mc6852_device_config;
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||||
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||||
// construction/destruction
|
||||
mc6852_device(running_machine &_machine, const mc6852_device_config &_config);
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public:
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DECLARE_READ8_MEMBER( read );
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DECLARE_WRITE8_MEMBER( write );
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||||
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DECLARE_WRITE_LINE_MEMBER( rx_clk_w );
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DECLARE_WRITE_LINE_MEMBER( tx_clk_w );
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||||
DECLARE_WRITE_LINE_MEMBER( cts_w );
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||||
DECLARE_WRITE_LINE_MEMBER( dcd_w );
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||||
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||||
DECLARE_READ_LINE_MEMBER( sm_dtr_r );
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||||
DECLARE_READ_LINE_MEMBER( tuf_r );
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||||
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||||
protected:
|
||||
// device-level overrides
|
||||
virtual void device_start();
|
||||
virtual void device_reset();
|
||||
virtual void device_timer(emu_timer &timer, device_timer_id id, int m_param, void *ptr);
|
||||
|
||||
private:
|
||||
static const device_timer_id TIMER_RX = 0;
|
||||
static const device_timer_id TIMER_TX = 1;
|
||||
|
||||
inline void receive();
|
||||
inline void transmit();
|
||||
|
||||
devcb_resolved_read_line m_in_rx_data_func;
|
||||
devcb_resolved_write_line m_out_tx_data_func;
|
||||
devcb_resolved_write_line m_out_irq_func;
|
||||
devcb_resolved_read_line m_in_cts_func;
|
||||
devcb_resolved_read_line m_in_dcd_func;
|
||||
devcb_resolved_write_line m_out_sm_dtr_func;
|
||||
devcb_resolved_write_line m_out_tuf_func;
|
||||
|
||||
// registers
|
||||
UINT8 m_status; // status register
|
||||
UINT8 m_cr[3]; // control registers
|
||||
UINT8 m_scr; // sync code register
|
||||
UINT8 m_rx_fifo[3]; // receiver FIFO
|
||||
UINT8 m_tx_fifo[3]; // transmitter FIFO
|
||||
UINT8 m_tdr; // transmit data register
|
||||
UINT8 m_tsr; // transmit shift register
|
||||
UINT8 m_rdr; // receive data register
|
||||
UINT8 m_rsr; // receive shift register
|
||||
|
||||
int m_cts; // clear to send
|
||||
int m_dcd; // data carrier detect
|
||||
int m_sm_dtr; // sync match/data terminal ready
|
||||
int m_tuf; // transmitter underflow
|
||||
|
||||
// timers
|
||||
emu_timer *m_rx_timer;
|
||||
emu_timer *m_tx_timer;
|
||||
|
||||
const mc6852_device_config &m_config;
|
||||
};
|
||||
|
||||
|
||||
// device type definition
|
||||
extern const device_type MC6852;
|
||||
|
||||
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user