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add DEVICE_RESET

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This commit is contained in:
Michaël Banaan Ananas 2011-08-16 10:50:28 +00:00
parent de5f2f7c2f
commit 4350726b12
1 changed files with 30 additions and 8 deletions
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38
src/emu/sound/ymz280b.c
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@ -86,20 +86,23 @@ struct _ymz280b_state
UINT8 irq_enable; /* current IRQ enable */
UINT8 keyon_enable; /* key on enable */
double master_clock; /* master clock frequency */
void (*irq_callback)(device_t *, int); /* IRQ callback */
void (*irq_callback)(device_t *, int); /* IRQ callback */
struct YMZ280BVoice voice[8]; /* the 8 voices */
UINT32 rom_readback_addr; /* where the CPU can read the ROM */
devcb_resolved_read8 ext_ram_read; /* external RAM read handler */
devcb_resolved_write8 ext_ram_write; /* external RAM write handler */
#if MAKE_WAVS
void * wavresample; /* resampled waveform */
void * wavresample; /* resampled waveform */
#endif
INT16 *scratch;
device_t *device;
};
static void write_to_register(ymz280b_state *, int);
/* step size index shift table */
static const int index_scale[8] = { 0x0e6, 0x0e6, 0x0e6, 0x0e6, 0x133, 0x199, 0x200, 0x266 };
@ -627,7 +630,7 @@ static STREAM_UPDATE( ymz280b_update )
/**********************************************************************************************
DEVICE_START( ymz280b ) -- start emulation of the YMZ280B
DEVICE_START/RESET( ymz280b ) -- start/reset emulation of the YMZ280B
***********************************************************************************************/
@ -700,6 +703,22 @@ static DEVICE_START( ymz280b )
#endif
}
static DEVICE_RESET( ymz280b )
{
int i;
ymz280b_state *chip = get_safe_token(device);
/* initial clear registers */
for (i = 0xff; i >= 0; i--)
{
chip->current_register = 0;
write_to_register(chip, 0);
}
chip->current_register = 0;
chip->status_register = 0;
}
/**********************************************************************************************
@ -713,9 +732,6 @@ static void write_to_register(ymz280b_state *chip, int data)
struct YMZ280BVoice *voice;
int i;
/* force an update */
chip->stream->update();
/* lower registers follow a pattern */
if (chip->current_register < 0x80)
{
@ -924,7 +940,7 @@ static int compute_status(ymz280b_state *chip)
/**********************************************************************************************
ymz280b_status_0_r/ymz280b_status_1_r -- handle a read from the status register
ymz280b_r/ymz280b_w -- handle external accesses
***********************************************************************************************/
@ -934,6 +950,7 @@ READ8_DEVICE_HANDLER( ymz280b_r )
if ((offset & 1) == 0)
{
/* read from external memory */
UINT8 read = chip->ext_ram_read.isnull() ? 0 : chip->ext_ram_read(chip->rom_readback_addr);
chip->rom_readback_addr = (chip->rom_readback_addr + 1) & 0xffffff;
return read;
@ -950,7 +967,12 @@ WRITE8_DEVICE_HANDLER( ymz280b_w )
if ((offset & 1) == 0)
chip->current_register = data;
else
{
/* force an update */
chip->stream->update();
write_to_register(chip, data);
}
}
@ -969,7 +991,7 @@ DEVICE_GET_INFO( ymz280b )
/* --- the following bits of info are returned as pointers to data or functions --- */
case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( ymz280b ); break;
case DEVINFO_FCT_STOP: /* Nothing */ break;
case DEVINFO_FCT_RESET: /* Nothing */ break;
case DEVINFO_FCT_RESET: info->start = DEVICE_RESET_NAME( ymz280b ); break;
/* --- the following bits of info are returned as NULL-terminated strings --- */
case DEVINFO_STR_NAME: strcpy(info->s, "YMZ280B"); break;