diff options
Diffstat (limited to 'trunk/src/emu/sound/3812intf.c')
-rw-r--r-- | trunk/src/emu/sound/3812intf.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/3812intf.c b/trunk/src/emu/sound/3812intf.c new file mode 100644 index 00000000000..25d97861131 --- /dev/null +++ b/trunk/src/emu/sound/3812intf.c @@ -0,0 +1,170 @@ +/****************************************************************************** +* FILE +* Yamaha 3812 emulator interface - MAME VERSION +* +* CREATED BY +* Ernesto Corvi +* +* UPDATE LOG +* JB 28-04-2002 Fixed simultaneous usage of all three different chip types. +* Used real sample rate when resample filter is active. +* AAT 12-28-2001 Protected Y8950 from accessing unmapped port and keyboard handlers. +* CHS 1999-01-09 Fixes new ym3812 emulation interface. +* CHS 1998-10-23 Mame streaming sound chip update +* EC 1998 Created Interface +* +* NOTES +* +******************************************************************************/ +#include "emu.h" +#include "3812intf.h" +#include "fm.h" +#include "sound/fmopl.h" + + +typedef struct _ym3812_state ym3812_state; +struct _ym3812_state +{ + sound_stream * stream; + emu_timer * timer[2]; + void * chip; + const ym3812_interface *intf; + device_t *device; +}; + + +INLINE ym3812_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == YM3812); + return (ym3812_state *)downcast<legacy_device_base *>(device)->token(); +} + + + +static void IRQHandler(void *param,int irq) +{ + ym3812_state *info = (ym3812_state *)param; + if (info->intf->handler) (info->intf->handler)(info->device, irq ? ASSERT_LINE : CLEAR_LINE); +} +static TIMER_CALLBACK( timer_callback_0 ) +{ + ym3812_state *info = (ym3812_state *)ptr; + ym3812_timer_over(info->chip,0); +} + +static TIMER_CALLBACK( timer_callback_1 ) +{ + ym3812_state *info = (ym3812_state *)ptr; + ym3812_timer_over(info->chip,1); +} + +static void TimerHandler(void *param,int c,attotime period) +{ + ym3812_state *info = (ym3812_state *)param; + if( period == attotime::zero ) + { /* Reset FM Timer */ + info->timer[c]->enable(false); + } + else + { /* Start FM Timer */ + info->timer[c]->adjust(period); + } +} + + +static STREAM_UPDATE( ym3812_stream_update ) +{ + ym3812_state *info = (ym3812_state *)param; + ym3812_update_one(info->chip, outputs[0], samples); +} + +static void _stream_update(void * param, int interval) +{ + ym3812_state *info = (ym3812_state *)param; + info->stream->update(); +} + + +static DEVICE_START( ym3812 ) +{ + static const ym3812_interface dummy = { 0 }; + ym3812_state *info = get_safe_token(device); + int rate = device->clock()/72; + + info->intf = device->static_config() ? (const ym3812_interface *)device->static_config() : &dummy; + info->device = device; + + /* stream system initialize */ + info->chip = ym3812_init(device,device->clock(),rate); + assert_always(info->chip != NULL, "Error creating YM3812 chip"); + + info->stream = device->machine().sound().stream_alloc(*device,0,1,rate,info,ym3812_stream_update); + + /* YM3812 setup */ + ym3812_set_timer_handler (info->chip, TimerHandler, info); + ym3812_set_irq_handler (info->chip, IRQHandler, info); + ym3812_set_update_handler(info->chip, _stream_update, info); + + info->timer[0] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_0), info); + info->timer[1] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_1), info); +} + +static DEVICE_STOP( ym3812 ) +{ + ym3812_state *info = get_safe_token(device); + ym3812_shutdown(info->chip); +} + +static DEVICE_RESET( ym3812 ) +{ + ym3812_state *info = get_safe_token(device); + ym3812_reset_chip(info->chip); +} + + +READ8_DEVICE_HANDLER( ym3812_r ) +{ + ym3812_state *info = get_safe_token(device); + return ym3812_read(info->chip, offset & 1); +} + +WRITE8_DEVICE_HANDLER( ym3812_w ) +{ + ym3812_state *info = get_safe_token(device); + ym3812_write(info->chip, offset & 1, data); +} + +READ8_DEVICE_HANDLER( ym3812_status_port_r ) { return ym3812_r(device, 0); } +READ8_DEVICE_HANDLER( ym3812_read_port_r ) { return ym3812_r(device, 1); } +WRITE8_DEVICE_HANDLER( ym3812_control_port_w ) { ym3812_w(device, 0, data); } +WRITE8_DEVICE_HANDLER( ym3812_write_port_w ) { ym3812_w(device, 1, data); } + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( ym3812 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(ym3812_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( ym3812 ); break; + case DEVINFO_FCT_STOP: info->stop = DEVICE_STOP_NAME( ym3812 ); break; + case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( ym3812 ); break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "YM3812"); break; + case DEVINFO_STR_FAMILY: strcpy(info->s, "Yamaha FM"); 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; + } +} + + +DEFINE_LEGACY_SOUND_DEVICE(YM3812, ym3812); |