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Altera_Forum
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20 years ago

a weird issue

Hi all, I encountered a weird issue that I enabled one PIO interrupt by using: alt_irq_register(STROBE_PIO_IRQ, edge_capture_ptr, command_receive_interrupt); STROBE_PIO_IR...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

The ienable register only has a bit for each interrupt actually connected to the Nios II.

For example, if you have IRQ 0 and IRQ 1, the ienable register only really has registers

for bit 0 and bit 1 of the ienable. The other bits of the ienable always read as zero.

So, it is possible that you don't have the interrupts properly connected to the CPU.