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Diffstat (limited to 'trunk/src/emu/sound/2612intf.c')
-rw-r--r--trunk/src/emu/sound/2612intf.c202
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);