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
|
// license:BSD-3-Clause
// copyright-holders:hap
/*
Texas Instruments TMS1024/TMS1025 I/O expander
No documentation was available, just a pinout.
Other than more port pins, TMS1025 is assumed to be same as TMS1024.
TODO:
- writes to port 0
- what's the MS pin?
- strobe is on rising edge? or falling edge?
*/
#include "machine/tms1024.h"
const device_type TMS1024 = &device_creator<tms1024_device>;
const device_type TMS1025 = &device_creator<tms1025_device>;
//-------------------------------------------------
// constructor
//-------------------------------------------------
tms1024_device::tms1024_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, TMS1024, "TMS1024 I/O Expander", tag, owner, clock, "tms1024", __FILE__), m_h(0), m_s(0), m_std(0),
m_write_port1(*this), m_write_port2(*this), m_write_port3(*this), m_write_port4(*this), m_write_port5(*this), m_write_port6(*this), m_write_port7(*this)
{
}
tms1024_device::tms1024_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
: device_t(mconfig, type, name, tag, owner, clock, shortname, source), m_h(0), m_s(0), m_std(0),
m_write_port1(*this), m_write_port2(*this), m_write_port3(*this), m_write_port4(*this), m_write_port5(*this), m_write_port6(*this), m_write_port7(*this)
{
}
tms1025_device::tms1025_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: tms1024_device(mconfig, TMS1025, "TMS1025 I/O Expander", tag, owner, clock, "tms1025", __FILE__)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void tms1024_device::device_start()
{
// resolve callbacks (there is no port 0)
m_write_port1.resolve_safe(); m_write_port[0] = &m_write_port1;
m_write_port2.resolve_safe(); m_write_port[1] = &m_write_port2;
m_write_port3.resolve_safe(); m_write_port[2] = &m_write_port3;
m_write_port4.resolve_safe(); m_write_port[3] = &m_write_port4;
m_write_port5.resolve_safe(); m_write_port[4] = &m_write_port5;
m_write_port6.resolve_safe(); m_write_port[5] = &m_write_port6;
m_write_port7.resolve_safe(); m_write_port[6] = &m_write_port7;
// zerofill
m_h = 0;
m_s = 0;
m_std = 0;
// register for savestates
save_item(NAME(m_h));
save_item(NAME(m_s));
save_item(NAME(m_std));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void tms1024_device::device_reset()
{
}
//-------------------------------------------------
// handlers
//-------------------------------------------------
WRITE8_MEMBER(tms1024_device::write_h)
{
// H1,2,3,4: data for outputs A,B,C,D
m_h = data & 0xf;
}
WRITE8_MEMBER(tms1024_device::write_s)
{
// S0,1,2: select port
m_s = data & 7;
}
WRITE_LINE_MEMBER(tms1024_device::write_std)
{
state = (state) ? 1 : 0;
// output on rising edge
if (state && !m_std)
{
if (m_s != 0)
(*m_write_port[m_s-1])((offs_t)(m_s-1), m_h);
}
m_std = state;
}
|