[ECOS] cyg_interrupt_set_vsr and ARM AEB-1

[ECOS] cyg_interrupt_set_vsr and ARM AEB-1

[Ivan Griffin]

I'm trying to do the following in cyg_prestart() to hook the IRQ and FIQ
interrupts on the ARM AEB-7.  Can anyone tell me why the following code
doesn't appear to work?

#define ARM_IRQ_INTR 0x18
#define ARM_FIQ_INTR 0x1c

extern void IRQ_Veneer(void);
extern void FIQ_Handler(void);

void cyg_prestart(void)
{
    cyg_interrupt_disable();
    cyg_interrupt_set_vsr(ARM_IRQ_INTR, (cyg_VSR_t*)IRQ_Veneer);
    cyg_interrupt_set_vsr(ARM_FIQ_INTR, (cyg_VSR_t*)FIQ_Handler);
    cyg_interrupt_enable();
}

Best Regards,
Ivan.

RE: [ECOS] cyg_interrupt_set_vsr and ARM AEB-1

[Gary Thomas]

On 30-May-00 Ivan Griffin wrote:
> I'm trying to do the following in cyg_prestart() to hook the IRQ and FIQ
> interrupts on the ARM AEB-7.  Can anyone tell me why the following code
> doesn't appear to work?
> 
>#define ARM_IRQ_INTR 0x18
>#define ARM_FIQ_INTR 0x1c
> 
> extern void IRQ_Veneer(void);
> extern void FIQ_Handler(void);
> 
> void cyg_prestart(void)
> {
>     cyg_interrupt_disable();
>     cyg_interrupt_set_vsr(ARM_IRQ_INTR, (cyg_VSR_t*)IRQ_Veneer);
>     cyg_interrupt_set_vsr(ARM_FIQ_INTR, (cyg_VSR_t*)FIQ_Handler);
>     cyg_interrupt_enable();
> }
> 

What does it appear to do [if not work]?

Re: [ECOS] cyg_interrupt_set_vsr and ARM AEB-1

[Ivan Griffin]

woops, perhaps I should have been a bit more descriptive the first time
around.

The IRQ Handler should flash the LEDs on the AEB every 800 interrupts
 - each
interrupt comes from an external hardware source about every
milli-second]
This does not happen.

However, the code is verified using the ARM compiler (minus eCos, using
a simple scheduler).

I'm using a stripped binary, downloaded via the ARM Multi-ICE and ADW
for Windows
(a real pain to debug -- using the symbols !) -- so I can see that the
non-interrupt related
portion of the software is running correctly.

Is there some reason these interrupts would still be hooked by eCos for
some purpose?
Or is it possible that output port C of the PPI on the AEB is being
setup not to drive
the LEDs?

Regards,
Ivan.

----- Original Message -----
From: Gary Thomas <gthomas@redhat.com>
To: Ivan Griffin <ivan.griffin@parthus.com>
Cc: <ecos-discuss@sourceware.cygnus.com>
Sent: Tuesday, May 30, 2000 9:34 PM
Subject: RE: [ECOS] cyg_interrupt_set_vsr and ARM AEB-1


>
> On 30-May-00 Ivan Griffin wrote:
> > I'm trying to do the following in cyg_prestart() to hook the IRQ and
FIQ
> > interrupts on the ARM AEB-7.  Can anyone tell me why the following
code
> > doesn't appear to work?
> >
> >#define ARM_IRQ_INTR 0x18
> >#define ARM_FIQ_INTR 0x1c
> >
> > extern void IRQ_Veneer(void);
> > extern void FIQ_Handler(void);
> >
> > void cyg_prestart(void)
> > {
> >     cyg_interrupt_disable();
> >     cyg_interrupt_set_vsr(ARM_IRQ_INTR, (cyg_VSR_t*)IRQ_Veneer);
> >     cyg_interrupt_set_vsr(ARM_FIQ_INTR, (cyg_VSR_t*)FIQ_Handler);
> >     cyg_interrupt_enable();
> > }
> >
>
> What does it appear to do [if not work]?
>

Re: [ECOS] cyg_interrupt_set_vsr and ARM AEB-1

[Hugo Tyson]

"Ivan Griffin" <ivan.griffin@parthus.com> writes:
> I'm trying to do the following in cyg_prestart() to hook the IRQ and FIQ
> interrupts on the ARM AEB-7.  Can anyone tell me why the following code
> doesn't appear to work?
> 
> #define ARM_IRQ_INTR 0x18
> #define ARM_FIQ_INTR 0x1c
> 
> extern void IRQ_Veneer(void);
> extern void FIQ_Handler(void);
> 
> void cyg_prestart(void)
> {
>     cyg_interrupt_disable();
>     cyg_interrupt_set_vsr(ARM_IRQ_INTR, (cyg_VSR_t*)IRQ_Veneer);
>     cyg_interrupt_set_vsr(ARM_FIQ_INTR, (cyg_VSR_t*)FIQ_Handler);
>     cyg_interrupt_enable();
> }

You should use these constants (from hal_intr.h) as the argument.

	#define CYGNUM_HAL_VECTOR_IRQ                  6
	#define CYGNUM_HAL_VECTOR_FIQ                  7

You are hitting trampoline addresses that are off the end of the table, and
no, sorry, it doesn't have any range checking ;-(

Aha, BUT it does have asserts on the vector range: a motto for life ;-) "if
in doubt, compile with asserts enabled" - I infer that you ain't or you
would have seen an assert fail.

Just in case: if those really are void...(void) C routines, it'll all go
horribly wrong.  If you're using extern void FOO(void); just to get hold of
a external address in C, and they're proper interrupt handlers writ in asm,
you'll be OK.

	- Huge

Re: [ECOS] cyg_interrupt_set_vsr and ARM AEB-1

[Hugo Tyson]

"Ivan Griffin" <ivan.griffin@parthus.com> writes:
> I'm trying to do the following in cyg_prestart() to hook the IRQ and FIQ
> interrupts on the ARM AEB-7.  Can anyone tell me why the following code
> doesn't appear to work?
> 
> #define ARM_IRQ_INTR 0x18
> #define ARM_FIQ_INTR 0x1c
> 
> extern void IRQ_Veneer(void);
> extern void FIQ_Handler(void);
> 
> void cyg_prestart(void)
> {
>     cyg_interrupt_disable();
>     cyg_interrupt_set_vsr(ARM_IRQ_INTR, (cyg_VSR_t*)IRQ_Veneer);
>     cyg_interrupt_set_vsr(ARM_FIQ_INTR, (cyg_VSR_t*)FIQ_Handler);
>     cyg_interrupt_enable();
> }

You should use these constants (from hal_intr.h) as the argument.

	#define CYGNUM_HAL_VECTOR_IRQ                  6
	#define CYGNUM_HAL_VECTOR_FIQ                  7

You are hitting trampoline addresses that are off the end of the table, and
no, sorry, it doesn't have any range checking ;-(

Aha, BUT it does have asserts on the vector range: a motto for life ;-) "if
in doubt, compile with asserts enabled" - I infer that you ain't or you
would have seen an assert fail.

Just in case: if those really are void...(void) C routines, it'll all go
horribly wrong.  If you're using extern void FOO(void); just to get hold of
a external address in C, and they're proper interrupt handlers writ in asm,
you'll be OK.

	- Huge