From 1beb671de1d39964ad3453e28fd48a117046a8cb Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Tue, 8 Jan 2013 15:04:53 -0500
Subject: Configurable interrupt interval for the sound timer. Right now, only
 22050 Hz audio at 2000-microsecond intervals works.

---
 Makefile              |  3 ++-
 source/nds/ds2sound.h | 14 +++++++-------
 source/nds/entry.cpp  |  4 +++-
 3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/Makefile b/Makefile
index 0642bf7..ed21eca 100644
--- a/Makefile
+++ b/Makefile
@@ -69,7 +69,8 @@ CFLAGS := -mips32 -mno-abicalls -fno-pic -fno-builtin \
 DEFS   := -DSPC700_C -DEXECUTE_SUPERFX_PER_LINE -DSDD1_DECOMP \
           -DVAR_CYCLES -DCPU_SHUTDOWN -DSPC700_SHUTDOWN \
           -DNO_INLINE_SET_GET -DNOASM -DHAVE_MKSTEMP '-DACCEPT_SIZE_T=size_t' \
-          -DUNZIP_SUPPORT -DSYNC_JOYPAD_AT_HBLANK
+          -DUNZIP_SUPPORT -DNO_OPEN_BUS
+#         -DSYNC_JOYPAD_AT_HBLANK
 
 .PHONY: clean makedirs
 .SUFFIXES: .elf .dat .plg
diff --git a/source/nds/ds2sound.h b/source/nds/ds2sound.h
index 089afb6..b901939 100644
--- a/source/nds/ds2sound.h
+++ b/source/nds/ds2sound.h
@@ -1,12 +1,11 @@
 // The sound buffer sizes used on the DS2's side, for each value of
 // Settings.SoundPlaybackRate.
-#define DS2_BUFFER_SIZE_1 256
-#define DS2_BUFFER_SIZE_2 256
-#define DS2_BUFFER_SIZE_3 256
-#define DS2_BUFFER_SIZE_4 512
-#define DS2_BUFFER_SIZE_5 512
-#define DS2_BUFFER_SIZE_6 1024
-#define DS2_BUFFER_SIZE_7 1024
+#define DS2_BUFFER_SIZE_4  512 /* tested working */
+// Others don't work, or don't work well.
+
+// In microseconds.
+#define INTERRUPT_TIME_4  2000 /* tested working */
+// Others don't work, or don't work well.
 
 // The sampling rate for the sound, in Hz, for each value of
 // Settings.SoundPlaybackRate.
@@ -19,6 +18,7 @@
 #define SND_SAMPLE_RATE_7 48000
 
 // Settings in use. The number should match in all three settings.
+#define INTERRUPT_TIME    INTERRUPT_TIME_4
 #define DS2_BUFFER_SIZE   DS2_BUFFER_SIZE_4
 #define SND_SAMPLE_RATE   SND_SAMPLE_RATE_4
 #define SNES9X_SRATE_ID   4
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index f14c917..a666a0b 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -538,7 +538,7 @@ int sfc_main (int argc, char **argv)
                   Settings.SoundBufferSize);
 	// Start a timer for the sound
 	initTimer(0 /* timer channel, 0 or 1 */,
-	          2000 /* period in microseconds */,
+	          INTERRUPT_TIME /* period in microseconds */,
 	          NDSSFCProduceSound /* timer function, void (unsigned int) */,
 	          0 /* programmer-specified argument to ^ */);
 	runTimer(0 /* timer channel, 0 or 1 */);
@@ -1157,6 +1157,8 @@ void NDSSFCProduceSound (unsigned int unused)
 		/* All data sent. */
 	}
 
+	IsSoundGenerated = FALSE;
+
 	so.samples_mixed_so_far -= sample_count;
 }
 
-- 
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