Re: [ECOS] Problem in FIQ with ecos for arm(at91sam7x)

[Mervin J <mervin_j at cms dot com>]

Hi Martin,
   As you told, there is some problem with stack pointer handling.Since 
the program behavior is not predicable with FIQ but works well with IRQ. 
How can i handle FIQ as it is,without taking it to IRQ level.

Thanks and Regards,
   Mervin J
Please
Martin Laabs wrote:
> Hi,
>
> Mervin J wrote:
>
> > static cyg_uint32 ui32FiqIsr(cyg_vector_t vector, cyg_addrword_t word)
> > {
> >    ade_int_proc_fp++;
> >    // Tell the processor that we have received
> >    // the interrupt.
> >    cyg_interrupt_acknowledge(vector);
> >    return(CYG_ISR_HANDLED);
> > }
>
> Can you please look at the stackpointer just before exiting of the 
> FIQ? Is it constant every time? And is its address correct?
> In FIQ mode some registers are shadowed and eCos tries to convert a 
> fiq to an irq in vectors.S. However - maybe there is a seldom 
> occurring bug. (However - most times the bug is in the user program.)
>
> What happens in the user program when ade_int_proc_fp++ overflows? 
> Might this be a problem?
>
> Greetings,
>  Martin L.


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