summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/cdp1852.h
blob: 70562f85e7e30e5ee32391a28d5930f214c853bf (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************

    RCA CDP1852 Byte-Wide Input/Output Port emulation

**********************************************************************
                            _____   _____
              CSI/_CSI   1 |*    \_/     | 24  Vdd
                  MODE   2 |             | 23  _SR/SR
                   DI0   3 |             | 22  DI7
                   DO0   4 |             | 21  DO7
                   DI1   5 |             | 20  DI6
                   DO1   6 |   CDP1852   | 19  DO6
                   DI2   7 |             | 18  DI5
                   DO2   8 |             | 17  DO5
                   DI3   9 |             | 16  DI4
                   DO3  10 |             | 15  DO4
                 CLOCK  11 |             | 14  _CLEAR
                   Vss  12 |_____________| 13  CS2

**********************************************************************/

#ifndef MAME_MACHINE_CDP1852_H
#define MAME_MACHINE_CDP1852_H

#pragma once




//**************************************************************************
//  INTERFACE CONFIGURATION MACROS
//**************************************************************************

#define MCFG_CDP1852_MODE_CALLBACK(_read) \
	devcb = &downcast<cdp1852_device &>(*device).set_mode_rd_callback(DEVCB_##_read);

#define MCFG_CDP1852_SR_CALLBACK(_write) \
	devcb = &downcast<cdp1852_device &>(*device).set_sr_wr_callback(DEVCB_##_write);

#define MCFG_CDP1852_DI_CALLBACK(_read) \
	devcb = &downcast<cdp1852_device &>(*device).set_data_rd_callback(DEVCB_##_read);

#define MCFG_CDP1852_DO_CALLBACK(_write) \
	devcb = &downcast<cdp1852_device &>(*device).set_data_wr_callback(DEVCB_##_write);



//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

// ======================> cdp1852_device

class cdp1852_device : public device_t
{
public:
	// construction/destruction
	cdp1852_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	template <class Object> devcb_base &set_mode_rd_callback(Object &&cb) { return m_read_mode.set_callback(std::forward<Object>(cb)); }
	template <class Object> devcb_base &set_sr_wr_callback(Object &&cb) { return m_write_sr.set_callback(std::forward<Object>(cb)); }
	template <class Object> devcb_base &set_data_rd_callback(Object &&cb) { return m_read_data.set_callback(std::forward<Object>(cb)); }
	template <class Object> devcb_base &set_data_wr_callback(Object &&cb) { return m_write_data.set_callback(std::forward<Object>(cb)); }

	DECLARE_READ8_MEMBER( read );
	DECLARE_WRITE8_MEMBER( write );

	uint8_t do_r() { return m_data; }

protected:
	// device-level overrides
	virtual void device_start() override;
	virtual void device_reset() override;
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;

private:
	void set_sr_line(int state);

	devcb_read_line    m_read_mode;
	devcb_write_line   m_write_sr;
	devcb_read8        m_read_data;
	devcb_write8       m_write_data;

	int m_new_data;             // new data written
	uint8_t m_data;               // data latch
	uint8_t m_next_data;          // next data

	int m_sr;                   // service request flag
	int m_next_sr;              // next value of service request flag

	// timers
	emu_timer *m_scan_timer;
};


// device type definition
DECLARE_DEVICE_TYPE(CDP1852, cdp1852_device)

#endif // MAME_MACHINE_CDP1852_H