Hi Mathias!
Thanks for nice example.
I believe I'm using register names right or
at least same way wrong as you do :)
I think I'll write some more constants to my projects so
that those higher bytes are setted in reasonable way.
> From: mtr...@web.de
> To: amforth-devel@lists.sourceforge.net
> Date: Mon, 17 Mar 2014 19:12:23 +0100
> Subject: Re: [Amforth] How amforth-shell register bitnames are intended to
> use?
>
> SPCR %00001100 bitmask: spi.mode
> $0 constant spi.mode0 \ sample rising/--
> $4 constant spi.mode1 \ --/sample falling
> $8 constant spi.mode2 \ sample falling/--
> $c constant spi.mode3 \ --/sample rising
> : spi.setmode ( spi-mode -- ) spi.mode pin! ;
I still don't like magic numbers and as amforth-shell
can substitute them...
SPCR_CPOL SPCR_CPHA or constant spi.mode3
But library code can't have that kind of depedency for
amforth-shell I believe.
>
> Used as
>
> spi.mode0 spi.setmode
>
> Similiar the spi.setspeed word.
>
> Note that the bit patterns from the different
> modeX definitions already match the bitmap:
> definition.
>
> "high" and "low" change all bits which are set
> to 1 in the bitmap: definition. They could be
> seen as
>
> address bitmap bitmap: example
> $ff example pin! \ high
> $00 example pin! \ low
This is maybe the finest feature of Amforth.
Usually I just end writing brainlesly
bla bla 0 <> my-portword pin! and it just works.
In init code I gather every bit, or them together
and then c! to register. But this is propably matter of taste.
At least I know what I have set then and if I mess somehow
the registers I can reset them with init word.
Hannu
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