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[Core/Sound] fixed Timer B overflow handling

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EkeEke 2017-04-09 19:12:21 +02:00
parent 116b001fb2
commit 62c1d82145
5 changed files with 9 additions and 5 deletions
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2
HISTORY.txt
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@ -121,6 +121,8 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* removed PSG boost noise feature & added optional high-quality PSG resampling
* fixed YM2612 self-feedback regression introduced in 1.7.1
* fixed YM2612 one-sample extra delay on operator1 output
* fixed YM2612 LFO PM implementation: block & keyscale code should not be modified by LFO (verified on YM2612 die)
* fixed YM2612 Timer B overflow handling
[Gamecube/Wii]
---------------

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12
core/sound/ym2612.c
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@ -26,6 +26,7 @@
**
** 09-04-2017 Eke-Eke (Genesis Plus GX):
** - fixed LFO PM implementation: block & keyscale code should not be modified by LFO (verified on YM2612 die)
** - fixed Timer B overflow handling
**
** 12-03-2017 Eke-Eke (Genesis Plus GX):
** - fixed Op1 self-feedback regression introduced by previous modifications
@ -801,10 +802,11 @@ INLINE void INTERNAL_TIMER_B(int step)
ym2612.OPN.ST.status |= 0x02;
/* reload the counter */
if (ym2612.OPN.ST.TBL)
do
{
ym2612.OPN.ST.TBC += ym2612.OPN.ST.TBL;
else
ym2612.OPN.ST.TBC = ym2612.OPN.ST.TBL;
}
while (ym2612.OPN.ST.TBC <= 0);
}
}
}
@ -1526,11 +1528,11 @@ INLINE void OPNWriteMode(int r, int v)
ym2612.OPN.LFO_AM = 126;
}
break;
case 0x24: /* timer A High 8*/
case 0x24: /* timer A High */
ym2612.OPN.ST.TA = (ym2612.OPN.ST.TA & 0x03)|(((int)v)<<2);
ym2612.OPN.ST.TAL = 1024 - ym2612.OPN.ST.TA;
break;
case 0x25: /* timer A Low 2*/
case 0x25: /* timer A Low */
ym2612.OPN.ST.TA = (ym2612.OPN.ST.TA & 0x3fc)|(v&3);
ym2612.OPN.ST.TAL = 1024 - ym2612.OPN.ST.TA;
break;