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Diffstat (limited to 'trunk/src/emu/sound/8950intf.c')
-rw-r--r-- | trunk/src/emu/sound/8950intf.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/8950intf.c b/trunk/src/emu/sound/8950intf.c new file mode 100644 index 00000000000..aa75ef39a69 --- /dev/null +++ b/trunk/src/emu/sound/8950intf.c @@ -0,0 +1,203 @@ +/****************************************************************************** +* 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 "8950intf.h" +#include "fm.h" +#include "sound/fmopl.h" + + +typedef struct _y8950_state y8950_state; +struct _y8950_state +{ + sound_stream * stream; + emu_timer * timer[2]; + void * chip; + const y8950_interface *intf; + device_t *device; +}; + + +INLINE y8950_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == Y8950); + return (y8950_state *)downcast<legacy_device_base *>(device)->token(); +} + + +static void IRQHandler(void *param,int irq) +{ + y8950_state *info = (y8950_state *)param; + if (info->intf->handler) (info->intf->handler)(info->device, irq ? ASSERT_LINE : CLEAR_LINE); +} +static TIMER_CALLBACK( timer_callback_0 ) +{ + y8950_state *info = (y8950_state *)ptr; + y8950_timer_over(info->chip,0); +} +static TIMER_CALLBACK( timer_callback_1 ) +{ + y8950_state *info = (y8950_state *)ptr; + y8950_timer_over(info->chip,1); +} +static void TimerHandler(void *param,int c,attotime period) +{ + y8950_state *info = (y8950_state *)param; + if( period == attotime::zero ) + { /* Reset FM Timer */ + info->timer[c]->enable(false); + } + else + { /* Start FM Timer */ + info->timer[c]->adjust(period); + } +} + + +static unsigned char Y8950PortHandler_r(void *param) +{ + y8950_state *info = (y8950_state *)param; + if (info->intf->portread) + return info->intf->portread(info->device,0); + return 0; +} + +static void Y8950PortHandler_w(void *param,unsigned char data) +{ + y8950_state *info = (y8950_state *)param; + if (info->intf->portwrite) + info->intf->portwrite(info->device,0,data); +} + +static unsigned char Y8950KeyboardHandler_r(void *param) +{ + y8950_state *info = (y8950_state *)param; + if (info->intf->keyboardread) + return info->intf->keyboardread(info->device,0); + return 0; +} + +static void Y8950KeyboardHandler_w(void *param,unsigned char data) +{ + y8950_state *info = (y8950_state *)param; + if (info->intf->keyboardwrite) + info->intf->keyboardwrite(info->device,0,data); +} + +static STREAM_UPDATE( y8950_stream_update ) +{ + y8950_state *info = (y8950_state *)param; + y8950_update_one(info->chip, outputs[0], samples); +} + +static void _stream_update(void *param, int interval) +{ + y8950_state *info = (y8950_state *)param; + info->stream->update(); +} + + +static DEVICE_START( y8950 ) +{ + static const y8950_interface dummy = { 0 }; + y8950_state *info = get_safe_token(device); + int rate = device->clock()/72; + + info->intf = device->static_config() ? (const y8950_interface *)device->static_config() : &dummy; + info->device = device; + + /* stream system initialize */ + info->chip = y8950_init(device,device->clock(),rate); + assert_always(info->chip != NULL, "Error creating Y8950 chip"); + + /* ADPCM ROM data */ + y8950_set_delta_t_memory(info->chip, *device->region(), device->region()->bytes()); + + info->stream = device->machine().sound().stream_alloc(*device,0,1,rate,info,y8950_stream_update); + /* port and keyboard handler */ + y8950_set_port_handler(info->chip, Y8950PortHandler_w, Y8950PortHandler_r, info); + y8950_set_keyboard_handler(info->chip, Y8950KeyboardHandler_w, Y8950KeyboardHandler_r, info); + + /* Y8950 setup */ + y8950_set_timer_handler (info->chip, TimerHandler, info); + y8950_set_irq_handler (info->chip, IRQHandler, info); + y8950_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( y8950 ) +{ + y8950_state *info = get_safe_token(device); + y8950_shutdown(info->chip); +} + +static DEVICE_RESET( y8950 ) +{ + y8950_state *info = get_safe_token(device); + y8950_reset_chip(info->chip); +} + + +READ8_DEVICE_HANDLER( y8950_r ) +{ + y8950_state *info = get_safe_token(device); + return y8950_read(info->chip, offset & 1); +} + +WRITE8_DEVICE_HANDLER( y8950_w ) +{ + y8950_state *info = get_safe_token(device); + y8950_write(info->chip, offset & 1, data); +} + +READ8_DEVICE_HANDLER( y8950_status_port_r ) { return y8950_r(device, 0); } +READ8_DEVICE_HANDLER( y8950_read_port_r ) { return y8950_r(device, 1); } +WRITE8_DEVICE_HANDLER( y8950_control_port_w ) { y8950_w(device, 0, data); } +WRITE8_DEVICE_HANDLER( y8950_write_port_w ) { y8950_w(device, 1, data); } + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( y8950 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(y8950_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( y8950 ); break; + case DEVINFO_FCT_STOP: info->stop = DEVICE_STOP_NAME( y8950 ); break; + case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( y8950 ); break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "Y8950"); 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(Y8950, y8950); |