"Michael Kalus" <[email protected]>
writes:
> Hi Matthias.
>
> ...
>> There is currently no
>> way to switch between forth and machine code (that would
>> be ;CODE btw)
>
>
> You may go from low to high level and back:
>
> code <name>
> (some code)
> ; -- jump to high level:
> ldi XL,low(pfa_forthISR)
> ldi XH,high(pfa_forthISR)
> jmp DO_NEXT
> pfa_forthISR:
> .dw XT_MAINWORD
> ; -- back to low level:
> .dw PC+1 ; next IP
> .dw PC+1 ; next cfa
> (more code )
> end-code
>
> But be shure to save all registers you use if you do so.
>
> ---
>
> Enochs code is a macro, assembling one single instruction SBI into
> dictionary and naming it.
> Calling that word will execute the SBI instruction.
>
> Michael
I confirm, the code works. I was not aware we have ;code as in other
implementations. The idea came when examining lib/assembler-test.frt
I suggest that these simple macros would become standard library
offerings. Without these atomic bit set/clear one needs to wrap code by
-int/+int if register bits are shared by different interrupt
routines. In my current project (at90can128 based) the AVR also has a
recommended general purpose register, GPIOR0 [0x1E (0x3E)], for this
very purpose.
Thank you, Enoch.
----------------------------------------------------------------------
: _bitio
dup $1F U> if &-9 throw then
over $7 U> if &-9 throw then
;
: port:hi! ( portadr bitno -- ) \ SBI
swap $20 - _bitio
3 lshift or $9A00 or
code , end-code
;
: port:lo! ( portadr bitno -- ) \ CBI
swap $20 - _bitio
3 lshift or $9800 or
code , end-code
;
----------------------------------------------------------------------
>
>
>
>
> Am 14.02.2013 um 20:14 schrieb Matthias Trute:
>
>> hi Enoch,
>>
>>
>>> I'd like to see this forum also offering code snippets, so here's my
>>> first humble attempt of harnessing the atomic bit manipulation
>>> instructions.
>>>
>>> : port:hi ( portadr bitno -- ) \ SBI
>>> swap $20 - 3 lshift or $9A00 or code , end-code
>>
>> Did you actually test this code? CODE is a parsing word
>> that starts a new dictionary entry. There is currently no
>> way to switch between forth and machine code (that would
>> be ;CODE btw)
>>
>> Puzzled
>> Matthias
>>
>>
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>
>
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------------------------------------------------------------------------------
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