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RE: Create interrupt problem
- From: "Vikas K. Prasad" <vikas dot prasad at ittiam dot com>
- To: <ecos-discuss at sources dot redhat dot com>
- Cc: "Gary Thomas" <gary at mlbassoc dot com>,"Vikas K. Prasad" <vikas dot prasad at ittiam dot com>
- Date: Tue, 5 Oct 2004 20:15:33 +0530
- Subject: RE: [ECOS] Create interrupt problem
Gary,
Oops! The timer1_obj is fine.
Further, timer1_handle is attached using:
cyg_interrupt_attach(timer1_handle);
Note that I did put a break point in hal_IRQ_handler()
and got the interrupt there (it is unmasked). After
tracing the same in assembly in function handle_IRQ_or_FIQ(),
41004b4: 1a000002 bne 41004c4 <handle_IRQ_or_FIQ+0xb8>
41004b8: e1a00009 mov r0, r9
41004bc: eb002c20 bl 410b544 <hal_spurious_IRQ>
41004c0: ea000006 b 41004e0 <spurious_IRQ>
41004c4: e59f10e8 ldr r1, [pc, #232] ; 41005b4 <.hal_interrupt_data>
41004c8: e7911104 ldr r1, [r1, r4, lsl #2]
41004cc: e59f20dc ldr r2, [pc, #220] ; 41005b0 <.hal_interrupt_handlers>
41004d0: e7926104 ldr r6, [r2, r4, lsl #2]
41004d4: e1a02009 mov r2, r9
41004d8: e1a0e00f mov lr, pc
41004dc: e1a0f006 mov pc, r6
I am hitting 0x41004d4 with register r6 not containing the
handler for timer1_isr() but instead it has address of
hal_default_isr(). I was not able to infer why?
What should I look for now ?
Regards,
Vikas
-----Original Message-----
From: Gary Thomas [mailto:gary@mlbassoc.com]
Sent: Tuesday, October 05, 2004 8:04 PM
To: Vikas K. Prasad
Cc: ecos-discuss@sources.redhat.com
Subject: Re: [ECOS] Create interrupt problem
On Tue, 2004-10-05 at 08:24, Vikas K. Prasad wrote:
> Hi,
>
> I was unable to attach an ISR properly. I am using a custom
> board (with excalibur on it) on which the basic ecos features
> are working and now I am testing the interrupts.
>
> I used the following command:
> cyg_interrupt_create((cyg_vector_t)TIMER1_VECTOR, /* Vector */
> (cyg_priority_t)TIMER1_PRI, /* Priority */
> TIMER1_DAT, /* Interrupt data */
> (cyg_ISR_t*)timer1_isr, /* ISR handler */
> (cyg_DSR_t*)timer1_dsr, /* DSR handler */
> &timer1_handle, /* Interrupt handle */
> &timer1_obj);
>
> With this after execution of the command I see that some
> junk values are stored in timer1_obj.
>
> (gdb) p/x * (cyg_interrupt*)timer1_obj
> $16 = {vector = 0xe3a00a40, priority = 0xe3a01880, isr = 0xe0410000,
> dsr = 0xe04ff000, data = 0xe1a00000, dsr_count = 0xe59f022c,
> next_dsr = 0xe3a01007}
This command makes no sense. You told eCos to put the interrupt
object in 'timer1_obj', but you are asking GDB to use the contents
of 'timer1_obj' as a pointer.
You really should write:
(gdb) p/x timer1_obj
>
> Because of this, hal_default_isr() is called and my ISR is never
> hit. Can you please give me some clues as to where the problem
> lies ? I am suspecting that the ISR routines are not not attached
> properly. Anything that I need to specifically do in the platform
> port for this?
After you created the interrupt, did you attach it? Did you
unmask it?
Try looking at the myriad of uses of the cyg_interrupt_XXX()
functions in the eCos code base and read the documentation.
Just creating an interrupt object does not allow interrupts
to happen.
--
Gary Thomas <gary@mlbassoc.com>
MLB Associates
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