Re: [Flashforth-devel] Assembler Loops

[Thomas B. <bus...@gm...>]

Dear Mikael,

thank you very much for helping. I test the program and it runs good, but
every 1 ms I get a error (like a delay). Please see at attachment.
Is that a watchdog?

Greetings Thomas

The files are here (Logic/Screenshot) ->
http://wikisend.com/download/584094/pwm_old.logicdata
http://wikisend.com/download/785422/Bildschirmfoto 2014-07-21 um
19.03.36.png



2014-07-11 16:46 GMT+02:00 Mikael Nordman <mik...@pp...>:

> Here is example for bitbanging 16 bits on a spi interface.
> It uses the FSR1L(=Tp) and FSR1H(=Tp 1 +)
> temporary registers which are always free to be used in
> any assembly word.
>
> Note that FSR1H is only 4 bits wide. FSR1L is 8 bits wide.
>
> Srw and Sminus words are accessing the parameter stack indirectly.
>
> There are also other registers that can safely be used as variables in
> assembler words.
> FSR2L FSR2H TBLPTRL TBLPTRH TABLAT PRODL PRODH
> The registers are located in access ram so no bank bits need to be set.
>
> : spi! ( u -- )
>    [ #2 movlw, ]
>    [ Tp a, movwf, ]
>    [ begin, ]
>      [ #8 movlw, ]
>      [ Tp 1+ a, movwf, ]
>      [ begin, ]
>        [ Srw f, a, rlcf, ]
>        [ cc, if, lata sdata a, bsf, else, lata sdata a, bcf, then, ]
>        [ lata sclk a, btg, ]
>        [ lata sclk a, btg, ]
>      [ Tp 1+ f, a, decf,  ]
>      [ z, until, ]
>      [ Sminus w, a, movf, ]
>    [ Tp f, a, decf,  ]
>    [ z, until,  ]
> ;
>
> Mike
>
>
>
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