OXYGENHUB
◆ main openmsx / src / sound / MSXPSG.cc
3.8 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
1 
#include "MSXPSG.hh"
2
3 
#include "CassettePort.hh"
4 
#include "JoystickPort.hh"
5 
#include "LedStatus.hh"
6 
#include "MSXMotherBoard.hh"
7 
#include "RenShaTurbo.hh"
8 
#include "serialize.hh"
9
10 
#include "StringOp.hh"
11 
#include "checked_cast.hh"
12 
#include "stl.hh"
13
14 
namespace openmsx {
15
16 
[[nodiscard]] static byte getKeyboardLayout(const MSXPSG& psg)
17 
{
18 
	// As many (mostly European) configs do not specify the layout
19 
	// in the PSG config, assume 50on for these cases.
20 
	auto value = psg.getDeviceConfig().getChildData("keyboardlayout", "50on");
21 
	StringOp::casecmp cmp; // case-insensitive
22 
	if (cmp(value, "50on")) {
23 
		return 0x00;
24 
	} else if (cmp(value, "jis")) {
25 
		return 0x40;
26 
	}
27 
	throw MSXException(
28 
		"Illegal keyboard layout configuration in '", psg.getName(),
29 
	        "' device configuration: '", value,
30 
		"', expected 'jis' or '50on'.");
31 
}
32
33 
// MSXDevice
34 
MSXPSG::MSXPSG(const DeviceConfig& config)
35 
	: MSXDevice(config)
36 
	, cassette(getMotherBoard().getCassettePort())
37 
	, renShaTurbo(getMotherBoard().getRenShaTurbo())
38 
	, ports(generate_array<2>([&](auto i) { return &getMotherBoard().getJoystickPort(unsigned(i)); }))
39 
	, keyLayout(getKeyboardLayout(*this))
40 
	, addressMask(config.getChildDataAsBool("mirrored_registers", false) ? 0x0f : 0xff)
41 
	, ay8910(getName(), *this, config, getCurrentTime())
42 
{
43 
	reset(getCurrentTime());
44 
}
45
46 
MSXPSG::~MSXPSG()
47 
{
48 
	powerDown(EmuTime::dummy());
49 
}
50
51 
void MSXPSG::reset(EmuTime time)
52 
{
53 
	registerLatch = 0;
54 
	ay8910.reset(time);
55 
}
56
57 
void MSXPSG::powerDown(EmuTime /*time*/)
58 
{
59 
	getLedStatus().setLed(LedStatus::KANA, false);
60 
}
61
62 
byte MSXPSG::readIO(uint16_t port, EmuTime time)
63 
{
64 
	switch (port & 0x03) {
65 
	case 2:
66 
		return ay8910.readRegister(registerLatch, time);
67 
	default:
68 
		// nothing for 0, 1 and 3
69 
		return 0xFF;
70 
	}
71 
}
72
73 
byte MSXPSG::peekIO(uint16_t /*port*/, EmuTime time) const
74 
{
75 
	return ay8910.peekRegister(registerLatch, time);
76 
}
77
78 
void MSXPSG::writeIO(uint16_t port, byte value, EmuTime time)
79 
{
80 
	switch (port & 0x03) {
81 
	case 0:
82 
		registerLatch = value & addressMask;
83 
		break;
84 
	case 1:
85 
		ay8910.writeRegister(registerLatch, value, time);
86 
		break;
87 
	}
88 
}
89
90
91 
// AY8910Periphery
92 
byte MSXPSG::readA(EmuTime time)
93 
{
94 
	byte joystick = ports[selectedPort]->read(time) |
95 
	                ((renShaTurbo.getSignal(time)) ? 0x10 : 0x00);
96
97 
#if 0
98 
	This breaks NinjaTap test programs.
99 
	Perhaps this behavior is different between MSX machines with a discrete
100 
	AY8910 chip versus machines with the PSG integrated in the MSX-engine?
101
102 
	// pin 6,7 input is ANDed with pin 6,7 output
103 
	byte pin67 = prev << (4 - 2 * selectedPort);
104 
	joystick &= (pin67| 0xCF);
105 
#endif
106
107 
	byte cassetteInput = cassette.cassetteIn(time) ? 0x80 : 0x00;
108 
	return joystick | keyLayout | cassetteInput;
109 
}
110
111 
void MSXPSG::writeB(byte value, EmuTime time)
112 
{
113 
	byte val0 =  (value & 0x03)       | ((value & 0x10) >> 2);
114 
	byte val1 = ((value & 0x0C) >> 2) | ((value & 0x20) >> 3);
115 
	ports[0]->write(val0, time);
116 
	ports[1]->write(val1, time);
117 
	selectedPort = (value & 0x40) >> 6;
118
119 
	if ((prev ^ value) & 0x80) {
120 
		getLedStatus().setLed(LedStatus::KANA, !(value & 0x80));
121 
	}
122 
	prev = value;
123 
}
124
125 
// version 1: initial version
126 
// version 2: joystickportA/B moved from here to MSXMotherBoard
127 
template<typename Archive>
128 
void MSXPSG::serialize(Archive& ar, unsigned version)
129 
{
130 
	ar.template serializeBase<MSXDevice>(*this);
131 
	ar.serialize("ay8910", ay8910);
132 
	if (ar.versionBelow(version, 2)) {
133 
		assert(Archive::IS_LOADER);
134 
		// in older versions there were always 2 real joystick ports
135 
		ar.serialize("joystickportA", *checked_cast<JoystickPort*>(ports[0]),
136 
		             "joystickportB", *checked_cast<JoystickPort*>(ports[1]));
137 
	}
138 
	ar.serialize("registerLatch", registerLatch);
139 
	byte portB = prev;
140 
	ar.serialize("portB", portB);
141 
	if constexpr (Archive::IS_LOADER) {
142 
		writeB(portB, getCurrentTime());
143 
	}
144 
	// selectedPort is derived from portB
145 
}
146 
INSTANTIATE_SERIALIZE_METHODS(MSXPSG);
147 
REGISTER_MSXDEVICE(MSXPSG, "PSG");
148
149 
} // namespace openmsx