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.glos...@l3t.com. Please
update your records.
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