Interrupts from HPS peripherals

Altera_Forum · ‎11-03-2017

Board : DE-10 ( Cyclone V SoC )

OS : FreeRTOS

Hi, I'm writing a driver for FreeRTOS+TCP stack. I configured the EMAC1 and DMA peripherals.

At this moment, everything works fine, except that I don't get any interrupt from EMAC1.

So for the moment I poll the EMAC and DMA status bits. I see them come high, and I can clear them by writing 1's.

What I did is :

● Program the GIC to enable interrupt 152 ( ALT_INT_INTERRUPT_EMAC1_IRQ )

● Set the handler + data

● Set a priority and trigger level

● program the peripheral ( EMAC interrupt mask reg 15, and EMAC/DMA interrupt enable DMA register 7 )

As a test, I tried to get interrupt from UART-0. The device works fine, but I don't see interrupts neither.

The only interrupt that does work is interrupt 29 ( ALT_INT_INTERRUPT_PPI_TIMER_PRIVATE ). That timer is used to get a FreeRTOS system clock.

I asked the same question on the FreeRTOS forum, but without success.

Thanks.

Altera_Forum · ‎11-07-2017

The problem is solved.

I had to call:

alt_int_dist_target_set( ALT_INT_INTERRUPT_EMAC1_IRQ, (alt_int_cpu_target_t) 0x01);

in order to direct the EMAC1 interrupts to the first core.

That call will set "Interrupt Processor Targets Registers", which start at 0x800 of the GIC.

Regards.