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1.1 root 1: //
2: // nono
3: // Copyright (C) 2024 nono project
4: // Licensed under nono-license.txt
5: //
6:
7: //
8: // SSG (YM2149)
9: //
10:
11: #pragma once
12:
13: #include "device.h"
14:
15: // レジスタ
16: struct SSG
17: {
18: // 7 6 5 4 3 2 1 0
19: // +---+---+---+---+---+---+---+---+
20: // R0 | Low |
21: // +---------------+---------------+ Frequency of channel A
22: // R1 | - | High |
23: // +---+---+---+---+---+---+---+---+
24: //
25: // +---+---+---+---+---+---+---+---+
26: // R2 | Low |
27: // +---------------+---------------+ Frequency of channel B
28: // R3 | - | High |
29: // +---+---+---+---+---+---+---+---+
30: //
31: // +---+---+---+---+---+---+---+---+
32: // R4 | Low |
33: // +---------------+---------------+ Frequency of channel C
34: // R5 | - | High |
35: // +---+---+---+---+---+---+---+---+
36: //
37: // +-----------+---+---+---+---+---+
38: // R6 | - | freq | Frequency of noise
39: // +-----------+---+---+---+---+---+
40: //
41: // +---+---+---+---+---+---+---+---+
42: // R7 | I/O | Noise | Tone | I/O port and mixer settings
43: // | B | A | C | B | A | C | B | A |
44: // +---+---+---+---+---+---+---+---+
45: //
46: // +-----------+---+---+---+---+---+
47: // R8 | - | M | level | Level of channel A
48: // +-----------+---+---+---+---+---+
49: // +-----------+---+---+---+---+---+
50: // R9 | - | M | level | Level of channel B
51: // +-----------+---+---+---+---+---+
52: // +-----------+---+---+---+---+---+
53: // RA | - | M | level | Level of channel C
54: // +-----------+---+---+---+---+---+
55: //
56: // +-------------------------------+
57: // RB | freq (Low) | Frequency of envelope
58: // RC | freq (High) |
59: // +-------------------------------+
60: //
61: // +---------------+---+---+---+---+
62: // RD | - |CNT|ATT|ALT|HLD| Shape of envelope
63: // +---------------+---+---+---+---+
64: //
65: // +-------------------------------+
66: // RE | 8 bit data | Data of I/O port A
67: // +-------------------------------+
68: // RF | 8 bit data | Data of I/O port B
69: // +-------------------------------+
70:
71: uint freq[3];
72: uint noise_freq;
73: uint settings;
74: bool ampmode[3];
75: uint amplevel[3];
76: uint envelope_freq;
77: uint envelope_shape;
78: uint dataA;
79: uint dataB;
80:
81: // Rn の値を返す
82: uint32 Get(uint n) const;
83:
84: // レベルレジスタの値を返す
85: uint32 GetLevelReg(int n) const {
86: return (ampmode[n] ? 0x10 : 0) | amplevel[n];
87: }
88: };
89:
90: class SSGDevice : public IODevice
91: {
92: using inherited = IODevice;
93:
94: // マスタークロック (1.536MHz)
95: static const uint fMaster = 1536000;
96:
97: public:
98: SSGDevice();
99: ~SSGDevice() override;
100:
101: void ResetHard(bool poweron) override;
102:
103: busdata Read1(uint32 addr) override;
104: busdata Write1(uint32 addr, uint32 data) override;
105: busdata Peek1(uint32 addr) override;
106:
107: private:
1.1.1.3 ! root 108: DECLARE_MONITOR_SCREEN(MonitorScreen);
1.1 root 109:
110: uint32 GetReg(uint32 n) const;
111:
112: uint32 regno {};
113: SSG reg {};
114:
1.1.1.2 root 115: Monitor *monitor {};
1.1 root 116: };
117:
1.1.1.3 ! root 118: inline SSGDevice *GetSSGDevice() {
1.1 root 119: return Object::GetObject<SSGDevice>(OBJ_SSG);
120: }
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