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Atari coding BBS
Re: Another STE question |
Posted by: Bod/STAX
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May,12.2012-12:41
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Can someone clarify the second part of my post?
Say I'm drawing something with the blitter using:
loop: bset #7,$fffff8a3c.w
nop
bne.s loop
Then the lower border interrupt occours and the 68k goes and does:
lower_border: bclr #7,$fffff8a3c.w ; turn off blitter
move.w sr,old_sr ; save sr state
move.w #$2100,sr
stop #$2100
move.w #$2700,sr
; here do the usual border removal stuff (wait for right border, do 60/50
; switch
bset #7,$fffff8a3c.w ; turn on blitter
move.w old_sr,sr ; restore sr state
bclr #0,$fffffa0f.w
rte
At the end of the interrupt the 68k returns back to doing:
loop: bset #7,$fffff8a3c.w
nop
bne.s loop
Then the lower border interrupt should not be affected by the blitter?
Only I've not implimented this code and the screen flicker has now returned. :(
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Date
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Another STE question
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Bod/STAX
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May,10.2012-20:28
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Re: Another STE question
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RA/pdx
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May,11.2012-11:56
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Re: Another STE question
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Bod/STAX
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May,11.2012-13:06
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Re: Another STE question
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Cyprian
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May,11.2012-13:17
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Re: Another STE question
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RA/pdx
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May,11.2012-21:04
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Re: Another STE question
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Bod/STAX
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May,12.2012-12:41
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Re: Another STE question
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evil
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May,12.2012-14:45
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Re: Another STE question
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Bod/STAX
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May,12.2012-17:56
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Re: Another STE question
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evil
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May,12.2012-18:24
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Re: Another STE question
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Bod/STAX
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May,12.2012-21:20
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Re: Another STE question
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evil
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May,13.2012-13:17
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Re: Another STE question
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Frank b
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May,14.2012-20:16
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Re: Another STE question
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Cyprian
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May,13.2012-18:22
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Re: Another STE question
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Patrice Mandin
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May,13.2012-14:38
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Re: Another STE question
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Bod/STAX
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May,15.2012-11:15
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Re: Another STE question
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evil
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May,16.2012-09:17
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Re: Another STE question
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Bod/STAX
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May,16.2012-21:30
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Re: Another STE question
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evil
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May,16.2012-22:40
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Re: Another STE question
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Bod/STAX
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May,17.2012-01:10
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Re: Another STE question
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Klaz
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May,17.2012-14:08
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Re: Another STE question
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Bod/STAX
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May,17.2012-21:35
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Re: Another STE question
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dan/pdx
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May,18.2012-16:03
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Re: Another STE question
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Bod/STAX
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May,18.2012-20:24
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Re: Another STE question
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Bod/STAX
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May,19.2012-16:21
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