Re: ARM and interrupts

[Bill Gatliff <bgat at billgatliff dot com>]

Toralf:


I've written ISRs in C, but you don't want to do that with GNU.  What 
you want to do instead is provide a "stub" ISR in assembly language 
(only two or three instructions), that calls the C "ISR".  That way, you 
aren't dependent on gcc's intermittent support of the __interrupt__ 
attribute.

See the Evaluator7T tutorial in the wiki or under 'articles' on my 
website, I think I provide a few examples.

Regards,


b.g.


Toralf Lund wrote:

> [ ... ]
>
> > The book is good, but it isn't cheap.  But hey, lack of knowledge on 
> > these details is even more expensive!
> >
> > > We also found some example code for a test board from Motorola 
> > > (we're actually using a Motorola CPU with ARM core), and it turns 
> > > out that they also have an "Interrupt Controler" application note 
> > > that's quite helpful (unlike the CPU reference manual, I might add..) 
> >
> >
> >
> >
> > Yes, I was going to mention something related to that.  With the 
> > "advanced/vectored interrupt controllers" that are all the rage now, 
> > there are some nifty tricks you can use to really boost interrupt 
> > handling performance.  I have examples, but if there are some in your 
> > manuals then go with them.
>
>
> BTW, have you written interrupt handlers in C? I'm unsure how to set 
> the functions to make them return the correct way etc., or if that's 
> even possible with gcc. The example code uses the __irq keyword (as in 
> "void __irq FIQ_Handler(void)") to do it, but this doesn't work with 
> gcc, I think.
>
> > b.g.
>
> - Toralf
>
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--
Bill Gatliff
So what part of make clean all install do you not understand?
bgat@billgatliff.com



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