[ragel-users] Best practice: using ragel for bit-based state machines on microcontroller?
thurston at complang.org
Fri May 15 02:37:31 UTC 2009
I wish I had some tips for you. I have no experience using Ragel for
bit-based parsers. I know it's pretty easy to mask out high bits using
alphtype unsigned char;
foo = 0xfc .. 0xff;
But masking out low bit patterns is not pleasant because the values are
Also, once you mask out some bits, you just move over the others in the
byte. I suppose you could use fhold strategically. Seems painful to me
Jan Sporbeck wrote:
> Hello there!
> I'd like to use ragel to design the state machine for a microcontroller
> project (avr atmega8535) written in C.
> I think I understand how to use it for streams of char, int, etc. But
> what's the best practice to use for bit based decisions?
> I could use union..struct to pack all bits in one datatype and process
> that. But I doubt that'll yield a performant implementation.
> I read messages on this list that ragel is used for uC projects, but no
> details how.
> So any hints or example code to get me started is appreciated.
> Thanks in advance,
> ragel-users mailing list
> ragel-users at complang.org
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