How to change RTEMS real time interrupt source to external pin of LEON UT699

[Thomas Doerfler (nt)]

Hi Richard,

another hint: Using printf inside interrupts is not always supported in
RTEMS...
wkr,

Thomas.

Am 30.08.2017 um 16:07 schrieb Richard.Glossop at L3T.com:
>
> Want to change the source of RTEMS time tick interrupt from Timer 0 on
> the LEON to a GPIO pin.  Have had success enabling the GPIO pin for
> the interrupt source (I get Spurious Interrupt 5 messages on the gdb
> console – we are using GPIO 5 – this tells me the interrupt is
> happening).  When I try to use rtems_interrupt_catch to install a new
> vector isr for the GPIO, the system crashes. 
>
>  
>
> Here is the code:
>
>  
>
> rtems_isr_entry reMapRealTimeInterrupt (void)
>
> {
>
>     int level;
>
>     rtems_isr_entry old_handler;
>
>     rtems_status_code retVal;
>
>    
>
>  
>
>     rtems_interrupt_disable (level);     // disable all maskable
> interrupts
>
>  
>
>  
>
>  
>
>     retVal = rtems_interrupt_catch(         // re-map vector 5 to our
> handler (GPIO 5)             
>
>         handler,
>
>         5,                           
>
>         &old_handler);
>
>  
>
>     printf("Remap retVal:0x%x\n",retVal);
>
>  
>
>  
>
>  
>
>     *(unsigned int*)TIMCTR1 &= ~0x00000009; // disable timer 1
> interrupt enable and timer enable
>
>     *(unsigned int*)IMR &= ~0x00000040;     // mask interrupt for
> timer 1 interrupt since it is no longer used
>
>     *(unsigned int*)IMR |=  0x00000020;     // enable GPIO 5 interrupt
> in IMR
>
>     *(unsigned int*)ILR |=  0x00000020;     // set interrupt 5 to be a
> level 1 interrupt
>
>  
>
>  
>
>     *(unsigned int*)GPIOIMR |= 0x00000020;  // enable bit 5 to cause
> interrupts (GPIO 5)
>
>     *(unsigned int*)GPIOIER |= 0x00000020;  // set GPIO interrupt 5 to
> be edge triggered
>
>     *(unsigned int*)GPIOIPR |= 0x00000020;  // set GPIO interrupt 5 to
> be rising edge
>
>  
>
>    
>
>     rtems_interrupt_enable (level);       // enable all previously
> enabled interrupts
>
>  
>
>     return old_handler;                      // return original isr
> address in case want to restore
>
>  
>
> }
>
>  
>
>     rtems_isr handler (rtems_vector_number vector)
>
>     {
>
>         printf("This is irq %d.\n",vector);
>
>         rtems_clock_tick();
>
>        
>
>  
>
>     }
>
>  
>
> Can anyone help with this, or point me to example code to accomplish
> the same thing?
>
>
> Effective immediately my new email address is Richard.Glossop at L3T.com.
> Please update your records.
>
>
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-- 
IMD Ingenieurbuero fuer Microcomputertechnik
Thomas Doerfler           Herbststrasse 8
D-82178 Puchheim          Germany
email:    Thomas.Doerfler at imd-systems.de
PGP public key available on request

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