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-rw-r--r--trunk/src/emu/sound/3812intf.c170
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);