diff options
Diffstat (limited to 'trunk/src/emu/sound/2612intf.c')
-rw-r--r-- | trunk/src/emu/sound/2612intf.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/2612intf.c b/trunk/src/emu/sound/2612intf.c new file mode 100644 index 00000000000..f6d95ad0452 --- /dev/null +++ b/trunk/src/emu/sound/2612intf.c @@ -0,0 +1,202 @@ +/*************************************************************************** + + 2612intf.c + + The YM2612 emulator supports up to 2 chips. + Each chip has the following connections: + - Status Read / Control Write A + - Port Read / Data Write A + - Control Write B + - Data Write B + +***************************************************************************/ + +#include "emu.h" +#include "sound/fm.h" +#include "sound/2612intf.h" + + +typedef struct _ym2612_state ym2612_state; +struct _ym2612_state +{ + sound_stream * stream; + emu_timer * timer[2]; + void * chip; + const ym2612_interface *intf; + device_t *device; +}; + + +INLINE ym2612_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == YM2612 || device->type() == YM3438); + return (ym2612_state *)downcast<legacy_device_base *>(device)->token(); +} + + + +/*------------------------- TM2612 -------------------------------*/ +/* IRQ Handler */ +static void IRQHandler(void *param,int irq) +{ + ym2612_state *info = (ym2612_state *)param; + if(info->intf->handler) info->intf->handler(info->device, irq); +} + +/* Timer overflow callback from timer.c */ +static TIMER_CALLBACK( timer_callback_2612_0 ) +{ + ym2612_state *info = (ym2612_state *)ptr; + ym2612_timer_over(info->chip,0); +} + +static TIMER_CALLBACK( timer_callback_2612_1 ) +{ + ym2612_state *info = (ym2612_state *)ptr; + ym2612_timer_over(info->chip,1); +} + +static void timer_handler(void *param,int c,int count,int clock) +{ + ym2612_state *info = (ym2612_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(1)) + info->timer[c]->adjust(period); + } +} + +/* update request from fm.c */ +void ym2612_update_request(void *param) +{ + ym2612_state *info = (ym2612_state *)param; + info->stream->update(); +} + +/***********************************************************/ +/* YM2612 */ +/***********************************************************/ + +static STREAM_UPDATE( ym2612_stream_update ) +{ + ym2612_state *info = (ym2612_state *)param; + ym2612_update_one(info->chip, outputs, samples); +} + + +static void ym2612_intf_postload(ym2612_state *info) +{ + ym2612_postload(info->chip); +} + + +static DEVICE_START( ym2612 ) +{ + static const ym2612_interface dummy = { 0 }; + ym2612_state *info = get_safe_token(device); + int rate = device->clock()/72; + + info->intf = device->static_config() ? (const ym2612_interface *)device->static_config() : &dummy; + info->device = device; + + /* FM init */ + /* Timer Handler set */ + info->timer[0] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_2612_0), info); + info->timer[1] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_2612_1), info); + + /* stream system initialize */ + info->stream = device->machine().sound().stream_alloc(*device,0,2,rate,info,ym2612_stream_update); + + /**** initialize YM2612 ****/ + info->chip = ym2612_init(info,device,device->clock(),rate,timer_handler,IRQHandler); + assert_always(info->chip != NULL, "Error creating YM2612 chip"); + + device->machine().save().register_postload(save_prepost_delegate(FUNC(ym2612_intf_postload), info)); +} + + +static DEVICE_STOP( ym2612 ) +{ + ym2612_state *info = get_safe_token(device); + ym2612_shutdown(info->chip); +} + +static DEVICE_RESET( ym2612 ) +{ + ym2612_state *info = get_safe_token(device); + ym2612_reset_chip(info->chip); +} + + +READ8_DEVICE_HANDLER( ym2612_r ) +{ + ym2612_state *info = get_safe_token(device); + return ym2612_read(info->chip, offset & 3); +} + +WRITE8_DEVICE_HANDLER( ym2612_w ) +{ + ym2612_state *info = get_safe_token(device); + ym2612_write(info->chip, offset & 3, data); +} + + +READ8_DEVICE_HANDLER( ym2612_status_port_a_r ) { return ym2612_r(device, 0); } +READ8_DEVICE_HANDLER( ym2612_status_port_b_r ) { return ym2612_r(device, 2); } +READ8_DEVICE_HANDLER( ym2612_data_port_a_r ) { return ym2612_r(device, 1); } +READ8_DEVICE_HANDLER( ym2612_data_port_b_r ) { return ym2612_r(device, 3); } + +WRITE8_DEVICE_HANDLER( ym2612_control_port_a_w ) { ym2612_w(device, 0, data); } +WRITE8_DEVICE_HANDLER( ym2612_control_port_b_w ) { ym2612_w(device, 2, data); } +WRITE8_DEVICE_HANDLER( ym2612_data_port_a_w ) { ym2612_w(device, 1, data); } +WRITE8_DEVICE_HANDLER( ym2612_data_port_b_w ) { ym2612_w(device, 3, data); } + + + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( ym2612 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(ym2612_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( ym2612 ); break; + case DEVINFO_FCT_STOP: info->stop = DEVICE_STOP_NAME( ym2612 ); break; + case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( ym2612 ); break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "YM2612"); 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; + } +} + + +DEVICE_GET_INFO( ym3438 ) +{ + switch (state) + { + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "YM3438"); break; + + default: DEVICE_GET_INFO_CALL(ym2612); break; + } +} + + +DEFINE_LEGACY_SOUND_DEVICE(YM2612, ym2612); +DEFINE_LEGACY_SOUND_DEVICE(YM3438, ym3438); |