summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/sound/mas3507d.c
blob: 3b5ad58f191aec1c17113afd4fc06bf4e04f7f9d (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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
//
// MAS 3507D MPEG audio decoder
//

#include "emu.h"
#include "mas3507d.h"

// device type definition
const device_type MAS3507D = &device_creator<mas3507d_device>;

mas3507d_device::mas3507d_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
	: device_t(mconfig, MAS3507D, "MAS3507D", tag, owner, clock),
		device_sound_interface(mconfig, *this)
{
}

void mas3507d_device::device_start()
{
}

void mas3507d_device::device_reset()
{
	i2c_scli = i2c_sdai = true;
	i2c_sclo = i2c_sdao = true;
	i2c_bus_state = IDLE;
	i2c_bus_address = UNKNOWN;
	i2c_bus_curbit = -1;
	i2c_bus_curval = 0;
}

void mas3507d_device::i2c_scl_w(bool line)
{
	if(line == i2c_scli)
		return;
	i2c_scli = line;

	if(i2c_scli) {
		if(i2c_bus_state == STARTED) {
			if(i2c_sdai)
				i2c_bus_curval |= 1 << i2c_bus_curbit;
			i2c_bus_curbit --;
			if(i2c_bus_curbit == -1) {
				if(i2c_bus_address == UNKNOWN) {
					if(i2c_device_got_address(i2c_bus_curval)) {
						i2c_bus_state = ACK;
						i2c_bus_address = VALIDATED;
					} else {
						i2c_bus_state = NAK;
						i2c_bus_address = WRONG;
					}
				} else if(i2c_bus_address == VALIDATED) {
					i2c_bus_state = ACK;
					i2c_device_got_byte(i2c_bus_curval);
				}
			}
		} else if(i2c_bus_state == ACK) {
			i2c_bus_state = ACK2;
			i2c_sdao = false;
		}
	} else {
		if(i2c_bus_state == ACK2) {
			i2c_bus_state = STARTED;
			i2c_bus_curbit = 7;
			i2c_bus_curval = 0;
			i2c_sdao = true;
		}
	}
}

void mas3507d_device::i2c_nak()
{
	assert(i2c_bus_state == ACK);
	i2c_bus_state = NAK;
}

void mas3507d_device::i2c_sda_w(bool line)
{
	if(line == i2c_sdai)
		return;
	i2c_sdai = line;

	if(i2c_scli) {
		if(!i2c_sdai) {
			i2c_bus_state = STARTED;
			i2c_bus_address = UNKNOWN;
			i2c_bus_curbit = 7;
			i2c_bus_curval = 0;
		} else {
			i2c_device_got_stop();
			i2c_bus_state = IDLE;
			i2c_bus_address = UNKNOWN;
			i2c_bus_curbit = 7;
			i2c_bus_curval = 0;
		}
	}
}

int mas3507d_device::i2c_scl_r()
{
	return i2c_scli && i2c_sclo;
}

int mas3507d_device::i2c_sda_r()
{
	return i2c_sdai && i2c_sdao;
}

bool mas3507d_device::i2c_device_got_address(UINT8 address)
{
	i2c_subdest = UNDEFINED;
	return (address & 0xfe) == 0x3a;
}

void mas3507d_device::i2c_device_got_byte(UINT8 byte)
{
	switch(i2c_subdest) {
	case UNDEFINED:
		if(byte == 0x68)
			i2c_subdest = DATA;
		else if(byte == 0x69)
			i2c_subdest = DATA;
		else if(byte == 0x6a)
			i2c_subdest = CONTROL;
		else
			i2c_subdest = BAD;
		i2c_bytecount = 0;
		break;
	case BAD:
		logerror("MAS I2C: Dropping byte %02x\n", byte);
		break;
	case DATA:
		if(!i2c_bytecount) {
			switch(byte >> 4) {
			case 0: case 1:
				i2c_command = CMD_RUN;
				i2c_io_adr = byte << 8;
				break;
			case 3:
				i2c_command = CMD_READ_CTRL;
				logerror("MAS I2C: READ_CTRL\n");
				break;
			case 9:
				i2c_io_adr = (byte & 15) << 4;
				i2c_command = CMD_WRITE_REG;
				break;
			case 0xa: case 0xb:
				i2c_io_bank = (byte >> 4) & 1;
				i2c_command = CMD_WRITE_MEM;
				break;
			case 0xd:
				i2c_command = CMD_READ_REG;
				logerror("MAS I2C: READ_REG\n");
				break;
			case 0xe: case 0xf:
				i2c_io_bank = (byte >> 4) & 1;
				i2c_command = CMD_READ_MEM;
				logerror("MAS I2C: READ_MEM\n");
				break;
			default:
				i2c_command = CMD_BAD;
				logerror("MAS I2C: BAD\n");
				break;
			}
		} else {
			switch(i2c_command) {
			default:
				logerror("MAS I2C: Ignoring byte %02x\n", byte);
				break;

			case CMD_WRITE_REG:
				switch(i2c_bytecount) {
				case 1: i2c_io_adr |= byte >> 4; i2c_io_val = byte & 15; break;
				case 2: i2c_io_val |= byte << 12; break;
				case 3: i2c_io_val |= byte << 4; reg_write(i2c_io_adr, i2c_io_val); break;
				case 4: i2c_nak(); return;
				}
				break;

			case CMD_RUN:
				if(i2c_bytecount > 1) {
					i2c_nak();
					return;
				}
				i2c_io_adr |= byte;
				run_program(i2c_io_adr);
				break;

			case CMD_WRITE_MEM:
				switch(i2c_bytecount) {
				case 2: i2c_io_count = byte << 8; break;
				case 3: i2c_io_count |= byte; break;
				case 4: i2c_io_adr = byte << 8; break;
				case 5: i2c_io_adr |= byte; break;
				}
				if(i2c_bytecount >= 6) {
					UINT32 i2c_wordid = (i2c_bytecount - 6) >> 2;
					UINT32 i2c_offset = (i2c_bytecount - 6) & 3;
					if(i2c_wordid >= i2c_io_count) {
						i2c_nak();
						return;
					}
					switch(i2c_offset) {
					case 0: i2c_io_val = byte << 8; break;
					case 1: i2c_io_val |= byte; break;
					case 3: i2c_io_val |= (byte & 15) << 16; mem_write(i2c_io_bank, i2c_io_adr + i2c_wordid, i2c_io_val); break;
					}
				}
				break;
			}
		}

		i2c_bytecount++;
		break;
	case CONTROL:
		logerror("MAS I2C: Control byte %02x\n", byte);
		break;
	}
}

void mas3507d_device::i2c_device_got_stop()
{
	logerror("MAS I2C: got stop\n");
}

void mas3507d_device::mem_write(int bank, UINT32 adr, UINT32 val)
{
	switch(adr | (bank ? 0x10000 : 0)) {
	case 0x0032f: logerror("MAS3507D: OutputConfig = %05x\n", val); break;
	case 0x107f8: logerror("MAS3507D: left->left   gain = %05x\n", val); break;
	case 0x107f9: logerror("MAS3507D: left->right  gain = %05x\n", val); break;
	case 0x107fa: logerror("MAS3507D: right->left  gain = %05x\n", val); break;
	case 0x107fb: logerror("MAS3507D: right->right gain = %05x\n", val); break;
	default: logerror("MAS3507D: %d:%04x = %05x\n", bank, adr, val); break;
	}
}

void mas3507d_device::reg_write(UINT32 adr, UINT32 val)
{
	switch(adr) {
	case 0x8e: logerror("MAS3507D: DCCF = %05x\n", val); break;
	case 0xaa: logerror("MAS3507D: Mute/bypass = %05x\n", val); break;
	case 0xe6: logerror("MAS3507D: StartupConfig = %05x\n", val); break;
	case 0xe7: logerror("MAS3507D: Kprescale = %05x\n", val); break;
	case 0x6b: logerror("MAS3507D: Kbass = %05x\n", val); break;
	case 0x6f: logerror("MAS3507D: Ktreble = %05x\n", val); break;
	default: logerror("MAS3507D: reg %02x = %05x\n", adr, val); break;
	}
}

void mas3507d_device::run_program(UINT32 adr)
{
	switch(adr) {
	case 0xfcb: logerror("MAS3507D: validate OutputConfig\n"); break;
	default: logerror("MAS3507D: run %04x\n", adr); break;
	}
}

void mas3507d_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
}