diff options
Diffstat (limited to 'trunk/src/emu/sound/262intf.c')
-rw-r--r-- | trunk/src/emu/sound/262intf.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/262intf.c b/trunk/src/emu/sound/262intf.c new file mode 100644 index 00000000000..de329c7eaf9 --- /dev/null +++ b/trunk/src/emu/sound/262intf.c @@ -0,0 +1,161 @@ +/*************************************************************************** + + 262intf.c + + MAME interface for YMF262 (OPL3) emulator + +***************************************************************************/ +#include "emu.h" +#include "262intf.h" +#include "ymf262.h" + + +typedef struct _ymf262_state ymf262_state; +struct _ymf262_state +{ + sound_stream * stream; + emu_timer * timer[2]; + void * chip; + const ymf262_interface *intf; + device_t *device; +}; + + +INLINE ymf262_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == YMF262); + return (ymf262_state *)downcast<legacy_device_base *>(device)->token(); +} + + + + +static void IRQHandler_262(void *param,int irq) +{ + ymf262_state *info = (ymf262_state *)param; + if (info->intf->handler) (info->intf->handler)(info->device, irq); +} + +static TIMER_CALLBACK( timer_callback_262_0 ) +{ + ymf262_state *info = (ymf262_state *)ptr; + ymf262_timer_over(info->chip, 0); +} + +static TIMER_CALLBACK( timer_callback_262_1 ) +{ + ymf262_state *info = (ymf262_state *)ptr; + ymf262_timer_over(info->chip, 1); +} + +static void timer_handler_262(void *param,int timer, attotime period) +{ + ymf262_state *info = (ymf262_state *)param; + if( period == attotime::zero ) + { /* Reset FM Timer */ + info->timer[timer]->enable(false); + } + else + { /* Start FM Timer */ + info->timer[timer]->adjust(period); + } +} + +static STREAM_UPDATE( ymf262_stream_update ) +{ + ymf262_state *info = (ymf262_state *)param; + ymf262_update_one(info->chip, outputs, samples); +} + +static void _stream_update(void *param, int interval) +{ + ymf262_state *info = (ymf262_state *)param; + info->stream->update(); +} + + +static DEVICE_START( ymf262 ) +{ + static const ymf262_interface dummy = { 0 }; + ymf262_state *info = get_safe_token(device); + int rate = device->clock()/288; + + info->intf = device->static_config() ? (const ymf262_interface *)device->static_config() : &dummy; + info->device = device; + + /* stream system initialize */ + info->chip = ymf262_init(device,device->clock(),rate); + assert_always(info->chip != NULL, "Error creating YMF262 chip"); + + info->stream = device->machine().sound().stream_alloc(*device,0,4,rate,info,ymf262_stream_update); + + /* YMF262 setup */ + ymf262_set_timer_handler (info->chip, timer_handler_262, info); + ymf262_set_irq_handler (info->chip, IRQHandler_262, info); + ymf262_set_update_handler(info->chip, _stream_update, info); + + info->timer[0] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_262_0), info); + info->timer[1] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_262_1), info); +} + +static DEVICE_STOP( ymf262 ) +{ + ymf262_state *info = get_safe_token(device); + ymf262_shutdown(info->chip); +} + +/* reset */ +static DEVICE_RESET( ymf262 ) +{ + ymf262_state *info = get_safe_token(device); + ymf262_reset_chip(info->chip); +} + + +READ8_DEVICE_HANDLER( ymf262_r ) +{ + ymf262_state *info = get_safe_token(device); + return ymf262_read(info->chip, offset & 3); +} + +WRITE8_DEVICE_HANDLER( ymf262_w ) +{ + ymf262_state *info = get_safe_token(device); + ymf262_write(info->chip, offset & 3, data); +} + +READ8_DEVICE_HANDLER ( ymf262_status_r ) { return ymf262_r(device, 0); } +WRITE8_DEVICE_HANDLER( ymf262_register_a_w ) { ymf262_w(device, 0, data); } +WRITE8_DEVICE_HANDLER( ymf262_register_b_w ) { ymf262_w(device, 2, data); } +WRITE8_DEVICE_HANDLER( ymf262_data_a_w ) { ymf262_w(device, 1, data); } +WRITE8_DEVICE_HANDLER( ymf262_data_b_w ) { ymf262_w(device, 3, data); } + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( ymf262 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(ymf262_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( ymf262 ); break; + case DEVINFO_FCT_STOP: info->stop = DEVICE_STOP_NAME( ymf262 ); break; + case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( ymf262 ); break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "YMF262"); 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(YMF262, ymf262); |