interrupt example leon3

[Jan.Sommer at dlr.de]

Hi Yaron,

> -----Original Message-----
> From: users [mailto:users-bounces at rtems.org] On Behalf Of yaron o
> Sent: Monday, October 23, 2017 10:21 AM
> To: users at rtems.org
> Subject: interrupt example leon3
> 
> Hello all
> 
> I want to add a new interrupt in my program , i check the rtems sample folder in
> order to see how to add one ,i found the rtems-irq.c file and i did as the file says
> but im using a leon 3 and theirs it says: error Example not intended for LEON3
> CPU.
> my question's are:
> firs how to call an interrupt in leon3 after i put it inside the ISR table, (i know that
> in some OS you just write asm {INT #} in order to invoke the interrupt).
> 

In rtems the low level interrupts are handled by the OS and forwarded to the function you 
registered with rtems_interrupt_catch.

> second i need some explain for the lines :
> *(unsigned long *) (0x80000090) = 0xc;
> 
> *(unsigned long *) (0x80000098) = 0xc;
> 

Checking the processor manual of the Leon2 these appear to be the registers of the interrupt controller (interrupt mask and interrupt force register).
You might have to setup the interrupt controller of your Leon3 in a similar manner for the example to work.

> in code below  because i don't quit understand it ( maybe it's invoke the interrupt
> but how does it relate to the handleExternalIrq) .
> 

As far as I see it first registers the function handleExternalIrq to the interrupts with id 0x12 and 0x13 using rtems_interrupt_catch.
Then it enables those interrupts in the interrupt controller (write to 0x80000090).
Finally it triggers the interrupts by writing to the interrupt force register (0x80000098).
The interrupt should occur, being noticed by rtems and the handleExternalIrq-function should be called to handle the interrupt.
I had some problems with calling printf from within ISRs. I would replace it with printk just to be sure.

One hint regarding the Leon3: In the gr712rc user manual the interrupt numbers defined there are mapped in RTEMS to ids starting with 0x10 + irq#.
Meaning e.g. the AHBSTAT interrupt (number #1) will have the id 0x11 in RTEMS and so on.

Cheers,

   Jan

> i add the rtems-irq.c bellow"
> --------------------------------------------------------------------------
> #include <rtems.h>
> /* configuration information */
> 
> #define CONFIGURE_INIT
> 
> #include <bsp.h> /* for device driver prototypes */
> 
> rtems_task Init (rtems_task_argument argument); rtems_isr handleExternalIrq
> (rtems_vector_number vector);
> 
> #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
> #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
> 
> #define CONFIGURE_MAXIMUM_TASKS             4
> 
> #define CONFIGURE_RTEMS_INIT_TASKS_TABLE
> 
> #define CONFIGURE_EXTRA_TASK_STACKS         (3 *
> RTEMS_MINIMUM_STACK_SIZE)
> 
> #include <rtems/confdefs.h>
> 
> #include <stdlib.h>
> #include <stdio.h>
> 
> rtems_task
> Init
> (
>     rtems_task_argument argument
> )
> {
>     rtems_status_code status;
>     rtems_isr_entry old_handle;
> 
>     status = rtems_interrupt_catch (handleExternalIrq, 0x12, &old_handle);
>     status = rtems_interrupt_catch (handleExternalIrq, 0x13, &old_handle);
> 
> #ifdef __erc32__
>     *(unsigned long *) (0x1f8004c) = 0x7ff0;
>     *(unsigned long *) (0x1f800d0) = 0x80000;
>     *(unsigned long *) (0x1f80054) = 0x0c;
> #elif defined(LEON2)
>     *(unsigned long *) (0x80000090) = 0xc;
>     *(unsigned long *) (0x80000098) = 0xc; 
> #elif defined(LEON3) #error Example
> not intended for LEON3 CPU #endif
>     exit(0);
> }
> 
> rtems_isr
> handleExternalIrq
> (
>     rtems_vector_number vector
> )
> {
>     printf ("External interrupt received with vector 0x%x\n", vector); }
> 
> 
> ----------------------------------------------------------------
> 
> thanks a lot for the helpers !
> 
> Yaron .
> 
> 
> 
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