[Tinyos Core WG] Re: Printf

[Kevin Klues]

I've changed the syntax of printf to be the same as for traditional c
programming i.e.

printf("Here is my variable %d", var)

The only catcher as David mentioned before is that it is not being
called from within a component since commands from interfaces do not
support variable number of arguments.  Take a look in TestPrintf under
apps/tests to see how it is used.

Other issues are that (as of now), you still have to flush the printf
after writing 250 bytes (or less) and wait for a flushDone before
being allowed to use printf again.  Eventually it would be nice to
implement some strategy that competes with the normal serial stack for
use of the USART for writing data out so that printf statements could
be continusously called and flushing would happen automatically.  This
would involve alot more effort than I have time for right now though.
If anyone feels like looking into it to extend it  you are more than
welcome. It would basically involve having to send serial packets
asynchronously so that multiple printf statements could continue to be
called concurrent with their sending.  I have a few ideas on how to do
this, just no time for it.

Kevin

On 10/24/06, Philip Levis <pal at cs.stanford.edu> wrote:
> On Oct 24, 2006, at 1:39 PM, Kevin Klues wrote:
>
> > You will also have to add the appropriate
> >
> > %T/lib/printf
> >
> > line to your .platform file.  Currently it is only checked in for
> > telosb
>
> Should this be added to all .platforms as an inherent part of TinyOS?
> Or is it an application-level thing?
>
> Phil
>


-- 
~Kevin