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added TEST register, used in some homebrew msx stuff for smooth pcm playback

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This commit is contained in:
Michaël Banaan Ananas 2011-08-29 14:55:00 +00:00
parent 1e612ed0c8
commit 456cb3e2b5
2 changed files with 95 additions and 18 deletions
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108
src/emu/sound/k051649.c
View File

@ -51,6 +51,8 @@ struct _k051649_state
INT16 *mixer_lookup;
short *mixer_buffer;
/* misc */
UINT8 test;
int f[10];
};
@ -101,8 +103,8 @@ static STREAM_UPDATE( k051649_update )
v=voice[j].volume;
f=voice[j].frequency;
k=voice[j].key;
/* SY 20040109: the SCC produces no sound for freq < 9 */
if (v && f > 8 && k)
/* SY 20040109: the SCC produces no sound for freq < 9 (channel is halted) */
if (f > 8)
{
const signed char *w = voice[j].waveform; /* 19991207.CAB */
int c=voice[j].counter;
@ -117,8 +119,8 @@ static STREAM_UPDATE( k051649_update )
/* Amuse source: Cab suggests this method gives greater resolution */
/* Sean Young 20010417: the formula is really: f = clock/(16*(f+1))*/
c+=(long)((((float)info->mclock / (float)((f+1) * 16))*(float)(1<<FREQBASEBITS)) / (float)(info->rate / 32));
offs = (c >> 16) & 0x1f;
*mix++ += (w[offs] * v)>>3;
offs = (c >> FREQBASEBITS) & 0x1f;
*mix++ += (w[offs] * v * k)>>3;
}
/* update the counter for this voice */
@ -157,9 +159,15 @@ static DEVICE_RESET( k051649 )
/* reset all the voices */
for (i = 0; i < 5; i++) {
voice[i].frequency = 0;
voice[i].volume = 0;
voice[i].volume = 0xf;
voice[i].counter = 0;
voice[i].key = 0;
}
/* other parameters */
info->test = 0;
for (i = 0; i < 5; i++)
info->f[i] = 0;
}
/********************************************************************************/
@ -167,27 +175,71 @@ static DEVICE_RESET( k051649 )
WRITE8_DEVICE_HANDLER( k051649_waveform_w )
{
k051649_state *info = get_safe_token(device);
if (info->test & 0x40)
return;
info->stream->update();
info->channel_list[offset>>5].waveform[offset&0x1f]=data;
/* SY 20001114: Channel 5 shares the waveform with channel 4 */
if (offset >= 0x60)
{
if (info->test & 0x80)
return;
/* SY 20001114: Channel 5 shares the waveform with channel 4 */
info->channel_list[3].waveform[offset&0x1f]=data;
info->channel_list[4].waveform[offset&0x1f]=data;
}
else
info->channel_list[offset>>5].waveform[offset&0x1f]=data;
}
READ8_DEVICE_HANDLER ( k051649_waveform_r )
{
k051649_state *info = get_safe_token(device);
if (offset >= 0x60)
{
if (info->test & 0xc0)
{
info->stream->update();
offset += (info->channel_list[3 + (info->test >> 6 & 1)].counter >> FREQBASEBITS);
}
}
else
{
if (info->test & 0x40)
{
info->stream->update();
offset += (info->channel_list[offset>>5].counter >> FREQBASEBITS);
}
}
return info->channel_list[offset>>5].waveform[offset&0x1f];
}
/* SY 20001114: Channel 5 doesn't share the waveform with channel 4 on this chip */
WRITE8_DEVICE_HANDLER( k052539_waveform_w )
{
k051649_state *info = get_safe_token(device);
if (info->test & 0x40)
return;
info->stream->update();
/* SY 20001114: Channel 5 doesn't share the waveform with channel 4 on this chip */
info->channel_list[offset>>5].waveform[offset&0x1f]=data;
}
READ8_DEVICE_HANDLER ( k052539_waveform_r )
{
k051649_state *info = get_safe_token(device);
if (info->test & 0x40)
{
info->stream->update();
offset += (info->channel_list[offset>>5].counter >> FREQBASEBITS);
}
return info->channel_list[offset>>5].waveform[offset&0x1f];
}
WRITE8_DEVICE_HANDLER( k051649_volume_w )
{
k051649_state *info = get_safe_token(device);
@ -201,18 +253,40 @@ WRITE8_DEVICE_HANDLER( k051649_frequency_w )
info->f[offset]=data;
info->stream->update();
if (info->test & 0x20)
info->channel_list[offset>>1].counter = ~0;
else if (info->channel_list[offset>>1].frequency < 9)
info->channel_list[offset>>1].counter |= ((1 << FREQBASEBITS) - 1);
info->channel_list[offset>>1].frequency=(info->f[offset&0xe] + (info->f[offset|1]<<8))&0xfff;
}
WRITE8_DEVICE_HANDLER( k051649_keyonoff_w )
{
int i;
k051649_state *info = get_safe_token(device);
info->stream->update();
info->channel_list[0].key=data&1;
info->channel_list[1].key=data&2;
info->channel_list[2].key=data&4;
info->channel_list[3].key=data&8;
info->channel_list[4].key=data&16;
for (i = 0; i < 5; i++) {
info->channel_list[i].key=data&1;
data >>= 1;
}
}
WRITE8_DEVICE_HANDLER( k051649_test_w )
{
k051649_state *info = get_safe_token(device);
info->test = data;
}
READ8_DEVICE_HANDLER ( k051649_test_r )
{
k051649_state *info = get_safe_token(device);
/* reading the test register sets it to $ff! */
info->test = 0xff;
return 0xff;
}
@ -236,10 +310,10 @@ DEVICE_GET_INFO( k051649 )
/* --- the following bits of info are returned as NULL-terminated strings --- */
case DEVINFO_STR_NAME: strcpy(info->s, "K051649"); break;
case DEVINFO_STR_FAMILY: strcpy(info->s, "Konami custom"); break;
case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break;
case DEVINFO_STR_FAMILY: strcpy(info->s, "Konami custom"); break;
case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break;
}
}

5
src/emu/sound/k051649.h
View File

@ -6,12 +6,15 @@
#include "devlegcy.h"
WRITE8_DEVICE_HANDLER( k051649_waveform_w );
READ8_DEVICE_HANDLER( k051649_waveform_r );
READ8_DEVICE_HANDLER ( k051649_waveform_r );
WRITE8_DEVICE_HANDLER( k051649_volume_w );
WRITE8_DEVICE_HANDLER( k051649_frequency_w );
WRITE8_DEVICE_HANDLER( k051649_keyonoff_w );
WRITE8_DEVICE_HANDLER( k051649_test_w );
READ8_DEVICE_HANDLER ( k051649_test_r );
WRITE8_DEVICE_HANDLER( k052539_waveform_w );
READ8_DEVICE_HANDLER ( k052539_waveform_r );
DECLARE_LEGACY_SOUND_DEVICE(K051649, k051649);