diff options
Diffstat (limited to 'trunk/src/emu/sound/2203intf.c')
-rw-r--r-- | trunk/src/emu/sound/2203intf.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/2203intf.c b/trunk/src/emu/sound/2203intf.c new file mode 100644 index 00000000000..7a60892da78 --- /dev/null +++ b/trunk/src/emu/sound/2203intf.c @@ -0,0 +1,209 @@ +#include "emu.h" +#include "2203intf.h" +#include "fm.h" + + +typedef struct _ym2203_state ym2203_state; +struct _ym2203_state +{ + sound_stream * stream; + emu_timer * timer[2]; + void * chip; + void * psg; + const ym2203_interface *intf; + device_t *device; +}; + + +INLINE ym2203_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == YM2203); + return (ym2203_state *)downcast<legacy_device_base *>(device)->token(); +} + + +static void psg_set_clock(void *param, int clock) +{ + ym2203_state *info = (ym2203_state *)param; + ay8910_set_clock_ym(info->psg, clock); +} + +static void psg_write(void *param, int address, int data) +{ + ym2203_state *info = (ym2203_state *)param; + ay8910_write_ym(info->psg, address, data); +} + +static int psg_read(void *param) +{ + ym2203_state *info = (ym2203_state *)param; + return ay8910_read_ym(info->psg); +} + +static void psg_reset(void *param) +{ + ym2203_state *info = (ym2203_state *)param; + ay8910_reset_ym(info->psg); +} + +static const ssg_callbacks psgintf = +{ + psg_set_clock, + psg_write, + psg_read, + psg_reset +}; + +/* IRQ Handler */ +static void IRQHandler(void *param,int irq) +{ + ym2203_state *info = (ym2203_state *)param; + if (info->intf->handler != NULL) + (*info->intf->handler)(info->device, irq); +} + +/* Timer overflow callback from timer.c */ +static TIMER_CALLBACK( timer_callback_2203_0 ) +{ + ym2203_state *info = (ym2203_state *)ptr; + ym2203_timer_over(info->chip,0); +} + +static TIMER_CALLBACK( timer_callback_2203_1 ) +{ + ym2203_state *info = (ym2203_state *)ptr; + ym2203_timer_over(info->chip,1); +} + +/* update request from fm.c */ +void ym2203_update_request(void *param) +{ + ym2203_state *info = (ym2203_state *)param; + info->stream->update(); +} + + +static void timer_handler(void *param,int c,int count,int clock) +{ + ym2203_state *info = (ym2203_state *)param; + if( count == 0 ) + { /* Reset FM Timer */ + info->timer[c]->enable(false); + } + else + { /* Start FM Timer */ + attotime period = attotime::from_hz(clock) * count; + if (!info->timer[c]->enable(true)) + info->timer[c]->adjust(period); + } +} + +static STREAM_UPDATE( ym2203_stream_update ) +{ + ym2203_state *info = (ym2203_state *)param; + ym2203_update_one(info->chip, outputs[0], samples); +} + + +static void ym2203_intf_postload (ym2203_state *info) +{ + ym2203_postload(info->chip); +} + + +static DEVICE_START( ym2203 ) +{ + static const ym2203_interface generic_2203 = + { + { + AY8910_LEGACY_OUTPUT, + AY8910_DEFAULT_LOADS, + DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_NULL + }, + NULL + }; + const ym2203_interface *intf = device->static_config() ? (const ym2203_interface *)device->static_config() : &generic_2203; + ym2203_state *info = get_safe_token(device); + int rate = device->clock()/72; /* ??? */ + + info->intf = intf; + info->device = device; + info->psg = ay8910_start_ym(NULL, YM2203, device, device->clock(), &intf->ay8910_intf); + assert_always(info->psg != NULL, "Error creating YM2203/AY8910 chip"); + + /* Timer Handler set */ + info->timer[0] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_2203_0), info); + info->timer[1] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_2203_1), info); + + /* stream system initialize */ + info->stream = device->machine().sound().stream_alloc(*device,0,1,rate,info,ym2203_stream_update); + + /* Initialize FM emurator */ + info->chip = ym2203_init(info,device,device->clock(),rate,timer_handler,IRQHandler,&psgintf); + assert_always(info->chip != NULL, "Error creating YM2203 chip"); + + device->machine().save().register_postload(save_prepost_delegate(FUNC(ym2203_intf_postload), info)); +} + +static DEVICE_STOP( ym2203 ) +{ + ym2203_state *info = get_safe_token(device); + ym2203_shutdown(info->chip); + ay8910_stop_ym(info->psg); +} + +static DEVICE_RESET( ym2203 ) +{ + ym2203_state *info = get_safe_token(device); + ym2203_reset_chip(info->chip); +} + + + +READ8_DEVICE_HANDLER( ym2203_r ) +{ + ym2203_state *info = get_safe_token(device); + return ym2203_read(info->chip, offset & 1); +} + +WRITE8_DEVICE_HANDLER( ym2203_w ) +{ + ym2203_state *info = get_safe_token(device); + ym2203_write(info->chip, offset & 1, data); +} + + +READ8_DEVICE_HANDLER( ym2203_status_port_r ) { return ym2203_r(device, 0); } +READ8_DEVICE_HANDLER( ym2203_read_port_r ) { return ym2203_r(device, 1); } +WRITE8_DEVICE_HANDLER( ym2203_control_port_w ) { ym2203_w(device, 0, data); } +WRITE8_DEVICE_HANDLER( ym2203_write_port_w ) { ym2203_w(device, 1, data); } + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( ym2203 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(ym2203_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( ym2203 ); break; + case DEVINFO_FCT_STOP: info->stop = DEVICE_STOP_NAME( ym2203 ); break; + case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( ym2203 ); break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "YM2203"); 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(YM2203, ym2203); |