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ym2612: Sync timer fixes from GenPlus-GX, fixes MT #5049. [Enik Land]

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This commit is contained in:
R. Belmont 2014-04-19 01:26:32 +00:00
parent 01fbc6fe3d
commit 8c7f587685
1 changed files with 14 additions and 39 deletions
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53
src/emu/sound/fm2612.c
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@ -883,7 +883,6 @@ INLINE void set_timers( FM_OPN *OPN, FM_ST *ST, void *n, int v )
/* b2 = timer enable a */
/* b1 = load b */
/* b0 = load a */
ST->mode = v;
if ((OPN->ST.mode ^ v) & 0xC0)
{
@ -902,48 +901,24 @@ INLINE void set_timers( FM_OPN *OPN, FM_ST *ST, void *n, int v )
}
}
/* reset Timer b flag */
if( v & 0x20 )
FM_STATUS_RESET(ST,0x02);
/* reset Timer a flag */
if( v & 0x10 )
FM_STATUS_RESET(ST,0x01);
/* load b */
if( v & 0x02 )
/* reload Timers */
if ((v&1) && !(ST->mode&1))
{
if( ST->TBC == 0 )
{
ST->TBC = ( 256-ST->TB)<<4;
/* External timer handler */
if (ST->timer_handler) (ST->timer_handler)(n,1,ST->TBC * ST->timer_prescaler,ST->clock);
}
ST->TAC = (1024-ST->TA);
/* External timer handler */
if (ST->timer_handler) (ST->timer_handler)(n,0,ST->TAC * ST->timer_prescaler,ST->clock);
}
else
{ /* stop timer b */
if( ST->TBC != 0 )
{
ST->TBC = 0;
if (ST->timer_handler) (ST->timer_handler)(n,1,0,ST->clock);
}
}
/* load a */
if( v & 0x01 )
if ((v&2) && !(ST->mode&2))
{
if( ST->TAC == 0 )
{
ST->TAC = (1024-ST->TA);
/* External timer handler */
if (ST->timer_handler) (ST->timer_handler)(n,0,ST->TAC * ST->timer_prescaler,ST->clock);
}
}
else
{ /* stop timer a */
if( ST->TAC != 0 )
{
ST->TAC = 0;
if (ST->timer_handler) (ST->timer_handler)(n,0,0,ST->clock);
}
ST->TBC = ( 256-ST->TB)<<4;
/* External timer handler */
if (ST->timer_handler) (ST->timer_handler)(n,1,ST->TBC * ST->timer_prescaler,ST->clock);
}
/* reset Timers flags */
ST->status &= (~v >> 4);
ST->mode = v;
}