summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/6532riot.h
blob: b4d558cbcc6369d8174ac75e6e5f61bb4bf7d511 (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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

  RIOT 6532 emulation

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

#pragma once

#ifndef __RIOT6532_H__
#define __RIOT6532_H__



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

#define MCFG_RIOT6532_IN_PA_CB(_devcb) \
	devcb = &riot6532_device::set_in_pa_callback(*device, DEVCB_##_devcb);

#define MCFG_RIOT6532_OUT_PA_CB(_devcb) \
	devcb = &riot6532_device::set_out_pa_callback(*device, DEVCB_##_devcb);

#define MCFG_RIOT6532_IN_PB_CB(_devcb) \
	devcb = &riot6532_device::set_in_pb_callback(*device, DEVCB_##_devcb);

#define MCFG_RIOT6532_OUT_PB_CB(_devcb) \
	devcb = &riot6532_device::set_out_pb_callback(*device, DEVCB_##_devcb);

#define MCFG_RIOT6532_IRQ_CB(_devcb) \
	devcb = &riot6532_device::set_irq_callback(*device, DEVCB_##_devcb);


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


// ======================> riot6532_device

class riot6532_device :  public device_t
{
public:
	// construction/destruction
	riot6532_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	template<class _Object> static devcb_base &set_in_pa_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_in_pa_cb.set_callback(object); }
	template<class _Object> static devcb_base &set_out_pa_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_out_pa_cb.set_callback(object); }
	template<class _Object> static devcb_base &set_in_pb_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_in_pb_cb.set_callback(object); }
	template<class _Object> static devcb_base &set_out_pb_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_out_pb_cb.set_callback(object); }
	template<class _Object> static devcb_base &set_irq_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_irq_cb.set_callback(object); }

	DECLARE_READ8_MEMBER( read );
	DECLARE_WRITE8_MEMBER( write );

	uint8_t reg_r(uint8_t offset, bool debugger_access = false);
	void reg_w(uint8_t offset, uint8_t data);

	void porta_in_set(uint8_t data, uint8_t mask);
	void portb_in_set(uint8_t data, uint8_t mask);

	uint8_t porta_in_get();
	uint8_t portb_in_get();

	uint8_t porta_out_get();
	uint8_t portb_out_get();

	void timer_end();

protected:
	class riot6532_port
	{
	public:
		uint8_t                   m_in;
		uint8_t                   m_out;
		uint8_t                   m_ddr;
		devcb_read8             *m_in_cb;
		devcb_write8            *m_out_cb;
	};

	// 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;
	virtual void device_post_load() override { }
	virtual void device_clock_changed() override { }


private:
	void update_irqstate();
	uint8_t apply_ddr(const riot6532_port *port);
	void update_pa7_state();
	uint8_t get_timer();

	riot6532_port   m_port[2];

	devcb_read8         m_in_pa_cb;
	devcb_write8        m_out_pa_cb;
	devcb_read8         m_in_pb_cb;
	devcb_write8        m_out_pb_cb;
	devcb_write_line    m_irq_cb;

	uint8_t           m_irqstate;
	uint8_t           m_irqenable;
	int             m_irq;

	uint8_t           m_pa7dir;     /* 0x80 = high-to-low, 0x00 = low-to-high */
	uint8_t           m_pa7prev;

	uint8_t           m_timershift;
	uint8_t           m_timerstate;
	emu_timer *     m_timer;

	enum
	{
		TIMER_END_CB
	};
};


// device type definition
extern const device_type RIOT6532;

#endif