Re: [ECOS] A safe way to print debug output in DSRs ?

[Grant Edwards <grante at visi dot com>]

On Tue, Aug 29, 2000 at 01:52:52PM -0700, Fabrice Gautier wrote:
> > -----Original Message-----
> > From: Grant Edwards [mailto:grante@visi.com]
> > Subject: Re: [ECOS] A safe way to print debug output in DSRs ?
> > 
> > If diag_printf does a busy-wait on a UART (as it does on my
> > system in hal_diag_write_char()), it can have a pretty big
> > timing impact on the DSR.  If it doesn't get called too often
> > and the messages fit into the UART FIFO, then this isn't too
> > much of a problem -- but it's important to keep in mind as you
> > sprinkle diag_printf() around in the code.
> 
> Has someone considered to add parallel port debug support? This could
> improve the ti ming problems, and should be easier to do than ethernet
> support. USB could be great too
> (Just in case someone is not busy enought...)

The diag_printf routine uses the hal_diag_write_char() routine,
so you can define that to do whatever you want with the data.
Writing it to a parallel port should be pretty trivial.

If you're talking about supporting bi-direction communication
with gdb via parallel port, then that's a bit more work...

-- 
Grant Edwards
grante@visi.com