Doubt about interrupts in xilinx zedboard BSP

Sergio Paracuellos sparacuellos at orbitalcs.com
Wed Apr 19 07:33:16 UTC 2017


2017-04-19 8:12 GMT+02:00 Thomas Doerfler <Thomas.Doerfler at imd-systems.de>:

> Hello,
>

Hi,


>
> one short request from me: If you got the solution, please post a sketch
> of it here. It is good to have this list as a reference not only for
> problems, but also for solutions ;-)
>

No problem :-). I am still working on it.

Regards,
    Sergio Paracuellos


>
> Kind regards,
>
> Thomas.
>
> Am 18.04.2017 um 10:54 schrieb Sergio Paracuellos:
> >
> >
> >
> >
> > 2017-04-18 10:15 GMT+02:00 Thomas Doerfler
> > <thomas.doerfler at embedded-brains.de
> > <mailto:thomas.doerfler at embedded-brains.de>>:
> >
> >     Hi,
> >
> >
> > Hi,
> >
> >
> >     does this link help?
> >
> >     https://forums.xilinx.com/t5/Zynq-All-Programmable-SoC/
> Zynq-Clear-Pending-SGI/td-p/747038
> >     <https://forums.xilinx.com/t5/Zynq-All-Programmable-SoC/
> Zynq-Clear-Pending-SGI/td-p/747038>
> >
> >
> >
> > Of course it helps :) Thank you very much. I am going to check this.
> >
> >
> >
> >
> >
> >     wkr,
> >
> >     Thomas.
> >
> >
> > Cheers,
> >     Sergio Paracuellos
> >
> >
> >
> >     Am 18.04.2017 um 10:11 schrieb Sergio Paracuellos:
> >     >
> >     >
> >     >
> >     >
> >     >
> >     > 2017-04-18 9:28 GMT+02:00 Thomas Doerfler
> >     > <thomas.doerfler at embedded-brains.de
> >     <mailto:thomas.doerfler at embedded-brains.de>
> >     > <mailto:thomas.doerfler at embedded-brains.de
> >     <mailto:thomas.doerfler at embedded-brains.de>>>:
> >     >
> >     >     Hi,
> >     >
> >     >
> >     > Hi,
> >     >
> >     >
> >     >     what kind of interrupt source do you have? I assume that the
> >     intterrupt
> >     >     source keeps it interrupt request active, until you have done
> >     something
> >     >     in the interrupt source registers that makes the interrupt
> >     inactive
> >     >     again.
> >     >
> >     >
> >     >
> >     > The interrupt is a Software Generated Interrupt one which uses
> >     SGI0 HW IRQ.
> >     >
> >     > The interrupt pending bit for the vector is being cleared in
> >     > bsp_interrupt_dispatch() routine for the arm's based bsp's.
> >     >
> >     > It should be enough to get this working, but it seems it is not.
> >     > Something that I have to keep in mind?
> >     >
> >     >
> >     >
> >     >     Example: If you interrupt source is a UART receiver, the
> interrupt
> >     >     request usually stays active until you have pulled all the
> >     received UART
> >     >     bytes from the UART receive data register...
> >     >
> >     >     wkr,
> >     >
> >     >     Thomas.
> >     >
> >     >
> >     > Cheers,
> >     >     Sergio Paracuellos
> >     >
> >     >
> >     >
> >     >     Am 18.04.2017 um 09:24 schrieb Sergio Paracuellos:
> >     >     > Hi all,
> >     >     >
> >     >     > I am trying to exec some code over xilinx-zynq zedboard. The
> >     code
> >     >     tries
> >     >     > to make use of interrupts. I am installing the interrupt
> routine
> >     >     for the
> >     >     > interrupt vector  using rtems_interrupt_handler_install
> routine
> >     >     which is
> >     >     > seems the correct one for this board. When the interrupt is
> >     >     trigered the
> >     >     > handler is correctly called but it becomes in a infinite
> >     loop status
> >     >     > when the interrupt is being handled. So is obvious that i am
> >     doing
> >     >     > something wrong. The pseudo code for this is like the
> following:
> >     >     >
> >     >     > #include <bsp.h>
> >     >     > #include <stdlib.h>
> >     >     > #include <rtems/irq.h>
> >     >     > #include <rtems/irq-extension.h>
> >     >     >
> >     >     > #define MAX_NUMBER_OF_MESSAGES 5
> >     >     >
> >     >     > #define INTERRUPT_VECTOR_NUMBER 100
> >     >     >
> >     >     > volatile int seq;
> >     >     >
> >     >     > void MyInterruptHandler(void *arg)
> >     >     > {
> >     >     >     puts("Interrupt handler called\n");
> >     >     >     seq++;
> >     >     > }
> >     >     >
> >     >     > rtems_task Init(rtems_task_argument argument)
> >     >     > {
> >     >     >     rtems_status_code sc;
> >     >     >
> >     >     >     sc = rtems_interrupt_handler_install(
> >     >     >                            INTERRUPT_VECTOR_NUMBER,
> >     >     >                            "MY_INTERRUPT",
> >     >     >                            RTEMS_INTERRUPT_UNIQUE,
> >     >     >                            (rtems_interrupt_handler)
> >     >     MyInterruptHandler,
> >     >     >                             NULL
> >     >     >            );
> >     >     >
> >     >     >      if (sc != RTEMS_SUCCESSFUL)
> >     >     >      {
> >     >     >            puts("MyInterruptHandler ->
> >     >     rtems_interrupt_handler_install()
> >     >     > error: %d\n", sc);
> >     >     >            exit(-1);
> >     >     >       }
> >     >     >
> >     >     >      puts("Waiting for messages...\n");
> >     >     >
> >     >     >      /* wait for five interrupts to be triggered */
> >     >     >     while (1)
> >     >     >     {
> >     >     >           if (seq == MAX_NUMBER_OF_MESSAGES)
> >     >     >               break;
> >     >     >      }
> >     >     >
> >     >     >      puts("Max number of messages retrieved\n");
> >     >     >      exit(0);
> >     >     > }
> >     >     >
> >     >     > The result is:
> >     >     >
> >     >     > Waiting for messages...
> >     >     >
> >     >     > Interrupt handler called
> >     >     > Interrupt handler called
> >     >     > Interrupt handler called
> >     >     > Interrupt handler called
> >     >     > Interrupt handler called
> >     >     > Interrupt handler called
> >     >     > Interrupt handler called
> >     >     > ....
> >     >     >
> >     >     > Enters in a infinite loop calling the interrupt handler....
> >     >     >
> >     >     > This similar code runs for me in other OS, so i am a little
> >     lost.
> >     >     Also,
> >     >     > I couldn't find any example of using interrupts for zedboard.
> >     >     >
> >     >     > What is missing in this code?
> >     >     >
> >     >     > Thanks in advance,
> >     >     >
> >     >     > Cheers,
> >     >     >     Sergio Paracuellos
> >     >     >
> >     >     >
> >     >     >
> >     >     >
> >     >     >
> >     >     > _______________________________________________
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> >     >     >
> >     >
> >     >     --
> >     >     --------------------------------------------
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> >     >     Thomas Doerfler
> >     >     Dornierstr. 4
> >     >     D-82178 Puchheim
> >     >     Germany
> >     >     email: Thomas.Doerfler at embedded-brains.de
> >     <mailto:Thomas.Doerfler at embedded-brains.de>
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> >     <mailto:Thomas.Doerfler at embedded-brains.de>>
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> >
> >     --
> >     --------------------------------------------
> >     embedded brains GmbH
> >     Thomas Doerfler
> >     Dornierstr. 4
> >     D-82178 Puchheim
> >     Germany
> >     email: Thomas.Doerfler at embedded-brains.de
> >     <mailto:Thomas.Doerfler at embedded-brains.de>
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> >     PGP: Public key available on request.
> >
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> >
> >
> >
> >
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>
> --
> IMD Ingenieurbuero fuer Microcomputertechnik
> Thomas Doerfler           Herbststrasse 8
> D-82178 Puchheim          Germany
> email:    Thomas.Doerfler at imd-systems.de
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