Doubt about interrupts in xilinx zedboard BSP

[Thomas Doerfler]

Hi,

does this link help?

https://forums.xilinx.com/t5/Zynq-All-Programmable-SoC/Zynq-Clear-Pending-SGI/td-p/747038

wkr,

Thomas.

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>>:
> 
>     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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>     <http://lists.rtems.org/mailman/listinfo/users>
>     >
> 
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>     Thomas Doerfler
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> 

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--------------------------------------------
embedded brains GmbH
Thomas Doerfler
Dornierstr. 4
D-82178 Puchheim
Germany
email: Thomas.Doerfler at embedded-brains.de
Phone: +49-89-18 94 741-12
Fax:   +49-89-18 94 741-09
PGP: Public key available on request.

Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.