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Atari coding BBS
| Re: DMA sound + timer A |
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Posted by: Laurent / Thadoss
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Dec,17.2013-17:22
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Hi,
> I think you want to set $401, not $41?
Thanks Thomas, you're right. It should work better. But it still doesn't.
I'd like to play a first sample, then at the end, play another sample in loop mode. For this, I want to use the Timer_A interrupt at the end of the first sample.
My first sample plays well, but I never hear the second one (it seems I never jump to the timer_a routine)
Here is what I do :
; Init TIMER_A part :
bclr #3,$fffffa17.w ; Automatic End-Interrupt ON
; Save the Timer_A vector address ($134)
lea.l save_timer_a(pc),a0
move.l $134.w,(a0)
and.b #$df,$fffffa13.w ; Timer-A Interrupt Mask A
and.b #$df,$fffffa0f.w ; Timer-A Interrupt in service
and.b #$df,$fffffa0b.w ; Timer-A Interrupt pending
and.b #$df,$fffffa07.w ; Timer-A Interrupt Enable
lea.l intro_timer_a(pc),a0
move.l a0,$134.w ; Set the new Timer-A vector on our Timer-A interrupt code
move.b #$08,$fffffa19.w ; Timer-A Event count mode
or.b #$20,$fffffa07.w ; Timer-A Interrupt Enable
or.b #$20,$fffffa13.w ; Timer-A Interrupt Mask A
; Play the sound
; Play the Start engine sound ; Timer_A int at end of sample
move.w #$401,$ffff8900.w
; The Timer_A interrupt routine
intro_timer_a: movem.l d6-d7,-(sp)
clr.w $ffff8900.w
[...]
; Set the new sound
move.w #$03,$ffff8900.w ; Play ronron sound + loop (no timer-A interrupt)
movem.l (sp)+,d6-d7
rte
Thanks in advance for the help.
Regards
Laurent
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