blob: 7b0b3a783b2cfb8b8b30ab594201ec1acb713c53 (
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
|
// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller, Manuel Abadia
/**********************************************
Philips SAA1099 Sound driver
**********************************************/
#ifndef MAME_SOUND_SAA1099_H
#define MAME_SOUND_SAA1099_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> saa1099_device
class saa1099_device : public device_t,
public device_sound_interface
{
public:
saa1099_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
void control_w(u8 data);
void data_w(u8 data);
void write(offs_t offset, u8 data);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_clock_changed() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
private:
struct saa1099_channel
{
saa1099_channel() : amplitude{ 0, 0 }, envelope{ 0, 0 } { }
u8 frequency = 0; // frequency (0x00..0xff)
bool freq_enable = false; // frequency enable
bool noise_enable = false; // noise enable
u8 octave = 0; // octave (0x00..0x07)
u16 amplitude[2]; // amplitude
u8 envelope[2]; // envelope (0x00..0x0f or 0x10 == off)
/* vars to simulate the square wave */
inline u32 freq() const { return (511 - frequency) << (8 - octave); } // clock / ((511 - frequency) * 2^(8 - octave))
int counter = 0;
u8 level = 0;
};
struct saa1099_noise
{
saa1099_noise() { }
/* vars to simulate the noise generator output */
int counter = 0;
int freq = 0;
u32 level = 0xffffffffU; // noise polynomial shifter
};
void envelope_w(int ch);
sound_stream *m_stream; // our stream
u8 m_noise_params[2]; // noise generators parameters
bool m_env_enable[2]; // envelope generators enable
bool m_env_reverse_right[2]; // envelope reversed for right channel
u8 m_env_mode[2]; // envelope generators mode
bool m_env_bits[2]; // true = 3 bits resolution
bool m_env_clock[2]; // envelope clock mode (true external)
u8 m_env_step[2]; // current envelope step
bool m_all_ch_enable; // all channels enable
bool m_sync_state; // sync all channels
u8 m_selected_reg; // selected register
saa1099_channel m_channels[6]; // channels
saa1099_noise m_noise[2]; // noise generators
};
DECLARE_DEVICE_TYPE(SAA1099, saa1099_device)
#endif // MAME_SOUND_SAA1099_H
|