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Atari coding BBS
| Re: DSP sign extend question |
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Posted by: Thomas / New Beat
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Dec,12.2013-20:14
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I keep talking to myself, but maybe it's useful to someone sometime... :-)
move #>$80,x1 ; For 0xABCD to 0xABCD00 conversion
move #>$8000,x0 ; For 0xABCD00 to 0xFFABCD conversion
move #converted_data_buffer,r0
;// Action
do #receive_length,_loop
_get: jclr #0,X:<<HOST_SR,_get ; Wait for data...
movep X:<<HOST_RX,y0 ; y0 = 0x00ABCD
mpy x1,y0,a a0,y1 ; a = 0x00:000000:ABCD00
mpy x0,y1,b b,x:(r0)+ ; b = 0xFF:FFABCD:000000
_loop:
;// Postsync registers from do-loop
move a0,y1 ; a = 0x00:000000:ABCD00
mpy x0,y1,b b,x:(r0)+ ; b = 0xFF:FFABCD:000000
move b,x:(r0)+ ; b = 0xFF:FFABCD:000000
Note! The two first values in converted_data_buffer will be junk. This
could be handled aswell by doing a presync of the registers. I havn't tested the code but it should work.
It should be fast enough to handle even if CPU moves as fast as possible (where a0 is hostport):
move.w d0,(a0)
move.w d1,(a0)
move.w d2,(a0)
...
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Topic
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Posted by
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Date
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DSP sign extend question
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Thadoss
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Oct,30.2013-01:28
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Re: DSP sign extend question
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mikro
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Oct,30.2013-11:43
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Re: DSP sign extend question
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Thadoss
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Oct,30.2013-12:37
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Re: DSP sign extend question
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mikro
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Oct,30.2013-14:09
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Re: DSP sign extend question
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ggn
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Oct,30.2013-14:55
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Re: DSP sign extend question
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ggn
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Oct,30.2013-16:03
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Re: DSP sign extend question
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Thadoss
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Oct,30.2013-17:43
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Re: DSP sign extend question
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Thomas / New Beat
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Nov,07.2013-08:59
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Re: DSP sign extend question
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Thomas / New Beat
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Dec,11.2013-09:29
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Re: DSP sign extend question
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Thomas / New Beat
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Dec,12.2013-20:14
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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