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r44673 Thursday 4th February, 2016 at 19:35:06 UTC by hap
tb303/tr606: simplified interrupt timing

[src/mame/drivers]

tb303.cpp tr606.cpp

trunk/src/mame/drivers/tb303.cpp

r253184	r253185
23	23	{
24	24	public:
25	25	tb303_state(const machine_config &mconfig, device_type type, const char *tag)
26		: hh_ucom4_state(mconfig, type, tag),
27		m_tp3_off_timer(*this, "tp3_off")
	26	: hh_ucom4_state(mconfig, type, tag)
28	27	{ }
29	28
30		required_device<timer_device> m_tp3_off_timer;
31
32	29	UINT8 m_ram[0xc00];
33	30	UINT16 m_ram_address;
34	31	bool m_ram_ce;
r253184	r253185
43	40	DECLARE_READ8_MEMBER(input_r);
44	41	void update_leds();
45	42
46		TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock);
47		TIMER_DEVICE_CALLBACK_MEMBER(tp3_off);
	43	TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock) { m_maincpu->set_input_line(0, ASSERT_LINE); }
	44	TIMER_DEVICE_CALLBACK_MEMBER(tp3_clear) { m_maincpu->set_input_line(0, CLEAR_LINE); }
48	45
49	46	virtual void machine_start() override;
50	47	};
51	48
52
53		/***************************************************************************
54
55		Timer/Interrupt
56
57		***************************************************************************/
58
59	49	// TP2 to MCU CLK: LC circuit(TI S74230), stable sine wave, 2.2us interval
60		#define TP2_CLOCK_HZ    454545 /* in hz */
	50	#define TP2_HZ      454545
61	51
62	52	// TP3 to MCU _INT: square wave, 1.8ms interval, short duty cycle
63		#define TP3_CLOCK       attotime::from_usec(1800)
64		#define TP3_OFF         (TP3_CLOCK / 8)
	53	#define TP3_PERIOD  attotime::from_usec(1800)
	54	#define TP3_LOW     (TP3_PERIOD / 8)
65	55
66		TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::tp3_off)
67		{
68		m_maincpu->set_input_line(0, CLEAR_LINE);
69		}
70	56
71		TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::tp3_clock)
72		{
73		m_maincpu->set_input_line(0, ASSERT_LINE);
74		m_tp3_off_timer->adjust(TP3_OFF);
75		}
76
77
78
79	57	/***************************************************************************
80	58
81	59	I/O
r253184	r253185
270	248	static MACHINE_CONFIG_START( tb303, tb303_state )
271	249
272	250	/* basic machine hardware */
273		MCFG_CPU_ADD("maincpu", NEC_D650, TP2_CLOCK_HZ)
	251	MCFG_CPU_ADD("maincpu", NEC_D650, TP2_HZ)
274	252	MCFG_UCOM4_READ_A_CB(READ8(tb303_state, input_r))
275	253	MCFG_UCOM4_READ_B_CB(READ8(tb303_state, input_r))
276	254	MCFG_UCOM4_READ_C_CB(READ8(tb303_state, ram_r))
r253184	r253185
282	260	MCFG_UCOM4_WRITE_H_CB(WRITE8(tb303_state, switch_w))
283	261	MCFG_UCOM4_WRITE_I_CB(WRITE8(tb303_state, strobe_w))
284	262
285		MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tb303_state, tp3_clock, TP3_CLOCK)
286		MCFG_TIMER_START_DELAY(TP3_CLOCK)
287		MCFG_TIMER_DRIVER_ADD("tp3_off", tb303_state, tp3_off)
	263	MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tb303_state, tp3_clock, TP3_PERIOD)
	264	MCFG_TIMER_START_DELAY(TP3_PERIOD - TP3_LOW)
	265	MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clear", tb303_state, tp3_clear, TP3_PERIOD)
288	266
289	267	MCFG_TIMER_DRIVER_ADD_PERIODIC("display_decay", hh_ucom4_state, display_decay_tick, attotime::from_msec(1))
290	268	MCFG_DEFAULT_LAYOUT(layout_tb303)

trunk/src/mame/drivers/tr606.cpp

r253184	r253185
23	23	{
24	24	public:
25	25	tr606_state(const machine_config &mconfig, device_type type, const char *tag)
26		: hh_ucom4_state(mconfig, type, tag),
27		m_tp3_off_timer(*this, "tp3_off")
	26	: hh_ucom4_state(mconfig, type, tag)
28	27	{ }
29	28
30		required_device<timer_device> m_tp3_off_timer;
	29	TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock) { m_maincpu->set_input_line(0, ASSERT_LINE); }
	30	TIMER_DEVICE_CALLBACK_MEMBER(tp3_clear) { m_maincpu->set_input_line(0, CLEAR_LINE); }
31	31
32		TIMER_DEVICE_CALLBACK_MEMBER(tp3_clock);
33		TIMER_DEVICE_CALLBACK_MEMBER(tp3_off);
34
35	32	virtual void machine_start() override;
36	33	};
37	34
38
39		/***************************************************************************
40
41		Timer/Interrupt
42
43		***************************************************************************/
44
45	35	// TP2 to MCU CLK: LC circuit(TI S74230), stable sine wave, 2.2us interval
46		#define TP2_CLOCK_HZ    454545 /* in hz */
	36	#define TP2_HZ      454545
47	37
	38	// MCU interrupt timing is same as in TB303
48	39	// TP3 to MCU _INT: square wave, 1.8ms interval, short duty cycle
49		#define TP3_CLOCK       attotime::from_usec(1800)
50		#define TP3_OFF         (TP3_CLOCK / 8)
	40	#define TP3_PERIOD  attotime::from_usec(1800)
	41	#define TP3_LOW     (TP3_PERIOD / 8)
51	42
52		TIMER_DEVICE_CALLBACK_MEMBER(tr606_state::tp3_off)
53		{
54		m_maincpu->set_input_line(0, CLEAR_LINE);
55		}
56	43
57		TIMER_DEVICE_CALLBACK_MEMBER(tr606_state::tp3_clock)
58		{
59		m_maincpu->set_input_line(0, ASSERT_LINE);
60		m_tp3_off_timer->adjust(TP3_OFF);
61		}
62
63
64
65	44	/***************************************************************************
66	45
67	46	I/O
r253184	r253185
100	79	static MACHINE_CONFIG_START( tr606, tr606_state )
101	80
102	81	/* basic machine hardware */
103		MCFG_CPU_ADD("maincpu", NEC_D650, TP2_CLOCK_HZ)
	82	MCFG_CPU_ADD("maincpu", NEC_D650, TP2_HZ)
104	83
105		MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tr606_state, tp3_clock, TP3_CLOCK)
106		MCFG_TIMER_START_DELAY(TP3_CLOCK)
107		MCFG_TIMER_DRIVER_ADD("tp3_off", tr606_state, tp3_off)
	84	MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clock", tr606_state, tp3_clock, TP3_PERIOD)
	85	MCFG_TIMER_START_DELAY(TP3_PERIOD - TP3_LOW)
	86	MCFG_TIMER_DRIVER_ADD_PERIODIC("tp3_clear", tr606_state, tp3_clear, TP3_PERIOD)
108	87
109	88	MCFG_TIMER_DRIVER_ADD_PERIODIC("display_decay", hh_ucom4_state, display_decay_tick, attotime::from_msec(1))
110	89	MCFG_DEFAULT_LAYOUT(layout_tr606)

https://github.com/mamedev/mame/commit/f6c90a7c052fbbde9201b8bb7b114290edadbf1a

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