dear all,
anybody using a silabs C8051F060 with sdcc in dma mode should be aware
that the following assembler sequence may lead to unpredictable results
as the second movx a,@dptr may not be executed properly if the execution
is parallel to the dma write cycle to the on-chip xram.
movx a,@dptr
inc dptr
movx a,@dptr
silabs was not able to confirm this problem to me, but the following
patch worked fine for me (thanks to Maarten Brock), which inserts a nop
before or after the inc dptr.
use the compile option "--peep-file peepfile" and create a peep file
with the following directives:
replace {
movx a,@dptr,a
inc dptr
movx a,@dptr,a
} by {
movx a,@dptr,a
nop
inc dptr
movx a,@dptr,a
}
best regards
Dani
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