Previous

199869 Revisions

Next

r20997 Tuesday 12th February, 2013 at 20:23:46 UTC by Curt Coder
mos6551: Added serial callbacks. [Curt Coder]

[src/emu/machine]

mos6551.c mos6551.h

trunk/src/emu/machine/mos6551.c

r20996	r20997
55	55	mos6551_device::mos6551_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
56	56	: device_t(mconfig, MOS6551, "MOS6551", tag, owner, clock),
57	57	device_serial_interface(mconfig, *this),
58		m_irq_handler(*this),
	58	m_write_irq(*this),
	59	m_read_rxd(*this),
	60	m_write_txd(*this),
	61	m_write_rts(*this),
	62	m_write_dtr(*this),
59	63	m_ctrl(0),
60	64	m_cmd(CMD_RIE),
61	65	m_st(ST_TDRE),
62		m_ext_rxc(0)
	66	m_ext_rxc(0),
	67	m_cts(1),
	68	m_dsr(1),
	69	m_dcd(1)
63	70	{
64	71	}
65	72
r20996	r20997
70	77
71	78	void mos6551_device::device_start()
72	79	{
73		m_irq_handler.resolve_safe();
	80	// resolve callbacks
	81	m_write_irq.resolve_safe();
	82	m_read_rxd.resolve_safe(1);
	83	m_write_txd.resolve_safe();
	84	m_write_rts.resolve_safe();
	85	m_write_dtr.resolve_safe();
74	86
75		transmit_register_reset();
76		receive_register_reset();
	87	// state saving
	88	save_item(NAME(m_ctrl));
	89	save_item(NAME(m_cmd));
	90	save_item(NAME(m_st));
	91	save_item(NAME(m_tdr));
	92	save_item(NAME(m_ext_rxc));
	93	save_item(NAME(m_cts));
	94	save_item(NAME(m_dsr));
	95	save_item(NAME(m_dcd));
77	96	}
78	97
79	98
r20996	r20997
86	105	m_ctrl = 0;
87	106	m_cmd = CMD_RIE;
88	107
	108	transmit_register_reset();
	109	receive_register_reset();
	110
89	111	update_serial();
90	112	}
91	113
92	114
93	115	//-------------------------------------------------
	116	//  tra_callback -
	117	//-------------------------------------------------
	118
	119	void mos6551_device::tra_callback()
	120	{
	121	m_write_txd(transmit_register_get_data_bit());
	122	}
	123
	124
	125	//-------------------------------------------------
94	126	//  tra_complete -
95	127	//-------------------------------------------------
96	128
r20996	r20997
104	136	if ((m_cmd & CMD_TC_MASK) == CMD_TC_TIE_RTS_LO)
105	137	{
106	138	m_st |= ST_IRQ;
107		m_irq_handler(ASSERT_LINE);
	139	m_write_irq(ASSERT_LINE);
108	140	}
109	141	}
110	142	}
111	143
112	144
113	145	//-------------------------------------------------
	146	//  rcv_callback -
	147	//-------------------------------------------------
	148
	149	void mos6551_device::rcv_callback()
	150	{
	151	if (m_read_rxd.isnull())
	152	receive_register_update_bit(get_in_data_bit());
	153	else
	154	receive_register_update_bit(m_read_rxd());
	155	}
	156
	157
	158	//-------------------------------------------------
114	159	//  rcv_complete -
115	160	//-------------------------------------------------
116	161
r20996	r20997
128	173	if (!(m_cmd & CMD_RIE))
129	174	{
130	175	m_st |= ST_IRQ;
131		m_irq_handler(ASSERT_LINE);
	176	m_write_irq(ASSERT_LINE);
132	177	}
133	178	}
134	179
r20996	r20997
191	236	else
192	237	m_connection_state &= ~SERIAL_STATE_DTR;
193	238
	239	m_write_dtr((m_connection_state & SERIAL_STATE_DTR) ? 0 : 1);
	240
194	241	if ((m_cmd & CMD_TC_MASK) == CMD_TC_RTS_HI)
195	242	m_connection_state &= ~SERIAL_STATE_RTS;
196	243	else
197	244	m_connection_state |= SERIAL_STATE_RTS;
	245
	246	m_write_rts((m_connection_state & SERIAL_STATE_RTS) ? 0 : 1);
198	247
199	248	serial_connection_out();
200	249	}
r20996	r20997
221	270	break;
222	271
223	272	case 1:
224		data = m_st;
	273	data = (m_dsr << 6) | (m_dcd << 5) | m_st;
225	274	m_st &= ~ST_IRQ;
226		m_irq_handler(CLEAR_LINE);
	275	m_write_irq(CLEAR_LINE);
227	276	break;
228	277
229	278	case 2:
r20996	r20997
259	308	if ((m_cmd & CMD_TC_MASK) == CMD_TC_TIE_RTS_LO)
260	309	{
261	310	m_st |= ST_IRQ;
262		m_irq_handler(ASSERT_LINE);
	311	m_write_irq(ASSERT_LINE);
263	312	}
264	313	}
265	314	break;
r20996	r20997
294	343
295	344	update_serial();
296	345	}
	346
	347
	348	//-------------------------------------------------
	349	//  rxc_w - receive clock write
	350	//-------------------------------------------------
	351
	352	WRITE_LINE_MEMBER( mos6551_device::rxc_w )
	353	{
	354	// TODO
	355	}
	356
	357
	358	//-------------------------------------------------
	359	//  cts_w - clear to send write
	360	//-------------------------------------------------
	361
	362	WRITE_LINE_MEMBER( mos6551_device::cts_w )
	363	{
	364	m_cts = state;
	365	}
	366
	367
	368	//-------------------------------------------------
	369	//  dsr_w - data set ready write
	370	//-------------------------------------------------
	371
	372	WRITE_LINE_MEMBER( mos6551_device::dsr_w )
	373	{
	374	if (m_dsr != state)
	375	{
	376	m_st |= ST_IRQ;
	377	m_write_irq(ASSERT_LINE);
	378	}
	379
	380	m_dsr = state;
	381	}
	382
	383
	384	//-------------------------------------------------
	385	//  dcd_w - data carrier detect write
	386	//-------------------------------------------------
	387
	388	WRITE_LINE_MEMBER( mos6551_device::dcd_w )
	389	{
	390	if (m_dcd != state)
	391	{
	392	m_st |= ST_IRQ;
	393	m_write_irq(ASSERT_LINE);
	394	}
	395
	396	m_dcd = state;
	397	}

trunk/src/emu/machine/mos6551.h

r20996	r20997
39	39
40	40	#define MCFG_MOS6551_ADD(_tag, _clock, _irq) \
41	41	MCFG_DEVICE_ADD(_tag, MOS6551, _clock) \
42		devcb = &mos6551_device::set_irq_handler(*device, DEVCB2_##_irq);
	42	downcast<mos6551_device *>(device)->set_irq_callback(DEVCB2_##_rxd, DEVCB2_##_irq);
43	43
	44	#define MCFG_MOS6551_RXD_TXD_CALLBACKS(_rxd, _txd) \
	45	downcast<mos6551_device *>(device)->set_rxd_txd_callbacks(DEVCB2_##_rxd, DEVCB2_##_txd);
44	46
	47	#define MCFG_MOS6551_RTS_CALLBACK(_rts) \
	48	downcast<mos6551_device *>(device)->set_rts_callback(DEVCB2_##_rts);
45	49
	50	#define MCFG_MOS6551_DTR_CALLBACK(_dtr) \
	51	downcast<mos6551_device *>(device)->set_dtr_callback(DEVCB2_##_dtr);
	52
	53
	54
46	55	//**************************************************************************
47	56	//  TYPE DEFINITIONS
48	57	//**************************************************************************
r20996	r20997
56	65	// construction/destruction
57	66	mos6551_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
58	67
59		// static configuration helpers
60		template<class _Object> static devcb2_base &set_irq_handler(device_t &device, _Object object) { return downcast<mos6551_device &>(device).m_irq_handler.set_callback(object); }
	68	template<class _irq> void set_irq_callback(_irq irq) { m_write_irq.set_callback(irq); }
	69	template<class _rxd, class _txd> void set_rxd_txd_callbacks(_rxd rxd, _txd txd) {
	70	m_read_rxd.set_callback(rxd);
	71	m_write_txd.set_callback(txd);
	72	}
	73	template<class _rts> void set_rts_callback(_rts rts) { m_write_rts.set_callback(rts); }
	74	template<class _dtr> void set_dtr_callback(_dtr dtr) { m_write_dtr.set_callback(dtr); }
61	75
62	76	DECLARE_READ8_MEMBER( read );
63	77	DECLARE_WRITE8_MEMBER( write );
64	78
	79	DECLARE_WRITE_LINE_MEMBER( rxc_w );
	80	DECLARE_WRITE_LINE_MEMBER( cts_w );
	81	DECLARE_WRITE_LINE_MEMBER( dsr_w );
	82	DECLARE_WRITE_LINE_MEMBER( dcd_w );
	83
65	84	void set_rxc(int clock);
66	85
67	86	protected:
r20996	r20997
70	89	virtual void device_reset();
71	90
72	91	// device_serial_interface overrides
	92	virtual void tra_callback();
73	93	virtual void tra_complete();
	94	virtual void rcv_callback();
74	95	virtual void rcv_complete();
75	96	virtual void input_callback(UINT8 state);
76	97
r20996	r20997
145	166
146	167	void update_serial();
147	168
148		devcb2_write_line m_irq_handler;
	169	devcb2_write_line m_write_irq;
	170	devcb2_read_line m_read_rxd;
	171	devcb2_write_line m_write_txd;
	172	devcb2_write_line m_write_rts;
	173	devcb2_write_line m_write_dtr;
149	174
150	175	UINT8 m_ctrl;
151	176	UINT8 m_cmd;
r20996	r20997
153	178	UINT8 m_tdr;
154	179
155	180	int m_ext_rxc;
	181	int m_cts;
	182	int m_dsr;
	183	int m_dcd;
156	184
157	185	static const int brg_divider[16];
158	186	};

Previous

199869 Revisions

Next

---

© 1997-2024 The MAME Team