sound: fix ym2612 freq latch

there is only a single register, as described in: http://www.mjsstuf.x10host.com/pages/vgmPlay/vgmPlay.htm
notaz · Jan 12, 2024 · 7a4081a · 7a4081a
1 parent ca980e1
commit 7a4081a
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Showing 2 changed files with 6 additions and 5 deletions.
diff --git a/pico/sound/ym2612.c b/pico/sound/ym2612.c
@@ -1671,8 +1671,8 @@ static int OPNWriteReg(int r, int v)
 		switch( OPN_SLOT(r) ){
 		case 0:		/* 0xa0-0xa2 : FNUM1 | depends on fn_h (below) */
 			{
-				UINT32 fn = (((UINT32)( (CH->fn_h)&7))<<8) + v;
-				UINT8 blk = CH->fn_h>>3;
+				UINT32 fn = ((UINT32)(ym2612.OPN.ST.fn_h & 7) << 8) | v;
+				UINT8 blk = ym2612.OPN.ST.fn_h >> 3;
 				/* keyscale code */
 				CH->kcode = (blk<<2) | opn_fktable[fn >> 7];
 				/* phase increment counter */
@@ -1685,7 +1685,7 @@ static int OPNWriteReg(int r, int v)
 			}
 			break;
 		case 1:		/* 0xa4-0xa6 : FNUM2,BLK */
-			CH->fn_h = v&0x3f;
+			ym2612.OPN.ST.fn_h = v & 0x3f;
 			ret = 0;
 			break;
 		case 2:		/* 0xa8-0xaa : 3CH FNUM1 */

diff --git a/pico/sound/ym2612.h b/pico/sound/ym2612.h
@@ -78,7 +78,7 @@ typedef struct
 	UINT8	ams;		/* channel AMS */
 
 	UINT8	kcode;		/* +11 key code:                        */
-	UINT8   fn_h;		/* freq latch           */
+	UINT8	pad2;
 	UINT8	upd_cnt;	/* eg update counter */
 	UINT32	fc;		/* fnum,blk:adjusted to sample rate */
 	UINT32	block_fnum;	/* current blk/fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */
@@ -101,7 +101,8 @@ typedef struct
 	int		TAC;		/* timer a maxval       */
 	int		TAT;		/* timer a ticker | need_save */
 	UINT8	TB;			/* timer b              */
-	UINT8	pad2[3];
+	UINT8   fn_h;		/* freq latch           */
+	UINT8	pad2[2];
 	int		TBC;		/* timer b maxval       */
 	int		TBT;		/* timer b ticker | need_save */
 	/* local time tables */