Scott,
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.
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.
Maarten
> Has anyone worked on making sdcc play nicely with the Nordic
> Semiconductor nRF24 series of 8051 microcontrollers? In particular,
> they have a dual DPTR mechanism which isn't quite the same as the one
> SDCC uses (setting DPS seems to change the location used for @DPTR
> instructions, but it doesn't change the place written to by MOV DPTR),
> and there's a hardware multiply unit which seems to want support from
> the sdcc library.
> --scott
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