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Atari coding BBS
| DSP sign extend question |
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Posted by: Thadoss
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Oct,30.2013-01:28
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Hi all,
I'll stuck on a stupid problem : I transfer a 16 bits signed value from the 68030 to the DSP and in the DSP, I write this value into the memory like this :
; CPU SIDE
clr.b $ffffa205.w
wait_dsp_transmit
move.w #200,d3
.loop_send_dsp_x0
move.w (a1)+,$ffffa206.w
dbf d3,.loop_send_dsp_x0
; DSP SIDE
do #200,receive_values
wait_receive
movep x:HRX,x:(r1)+
receive_values
The problem is when I want to use the negative values, they look like $00ffff into memory and they're not sign extended to 24 bits.
I'm sure I've already read something about this when I worked on hatari DSP emulation, but I've forgotten.
Any help needed please.
Thanks in advance,
Regards
Laurent / Thadoss
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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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