Re: [Emc-developers] pid with derivative inputs

[Chris R. <ch...@ti...>]

On Sat, Oct 30, 2010 at 12:32:50AM -0500, Jon Elson wrote:
> Jeff Epler wrote:
> > On Tue, Oct 26, 2010 at 08:29:52PM -0500, Jon Elson wrote:
> >   
> >> I wonder if we could get this committed to the development head?
> >>     
> >
> > This is now availble in the "master" branch for all to enjoy.
> >   
> I've been working on putting the velocity estimation into my hal_ppmc.c 
> driver.
> Does anyone have any suggestions for debugging a HAL driver module?  I now
> get :
> Default Trap Handler: vector 14: Suspend RT task dfab4800
> PPMC: shutting down

Google gave me some hints:

http://mail.rtai.org/pipermail/rtai/2003-January/002047.html

However I think you might find it faster by staring at the code
you've added.  Look closely wherever you dereference a pointer to
make sure that the pointer points where you think.  Remember that
array[...] is also a pointer dereference.

> I'll keep looking at the code, it isn't a very large addition of code.

Pastebin a git diff for us if you don't spot it.

Chris