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Re: [Sdcc-user] Nordic nRF24 support?
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From: Maarten B. <sou...@ds...> - 2010-04-14 20:19:38
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Scott,</span></font>
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Are you sure it doesn't write to DPTR1 when you set DPS
to 1 and then perform MOV DPTR,#0 ? B.t.w. SDCC only
uses dual datapointers in the alternative crtxinit.asm
and not in any other (generated) file IIRC.</span></font>
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To use the multiply unit you could adapt the _div*,
_mod* and _mul* library sources. But don't expect too
much of it, the advantage might drown in the overhead.
Also some _fs* routine might benefit. It seems to me the
unit misses an "operation done" indicator.</span></font>
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Maarten</span></font>
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> Has anyone worked on making sdcc play nicely with the Nordic</span></font>
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> Semiconductor nRF24 series of 8051 microcontrollers?  In particular,</span></font>
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> they have a dual DPTR mechanism which isn't quite the same as the one</span></font>
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> SDCC uses (setting DPS seems to change the location used for @DPTR</span></font>
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> instructions, but it doesn't change the place written to by MOV DPTR),</span></font>
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> and there's a hardware multiply unit which seems to want support from</span></font>
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> the sdcc library.</span></font>
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>  --scott</span></font>
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