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Altera_Forum's avatar
Altera_Forum
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13 years ago

having trouble with interrupt

Hello everyone , I'm try for a very long time to do a simple interrupt with nios ii. this is my problem: i have button in sratix ii dev kit and all i want to do in nios is just to turn on ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

IOWR_ALTERA_AVALON_PIO_IRQ_MASK(button_base_address,1); // enable irq

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(button_base_address, 1); // clear irq

Infact you are using PIO bit 0, then mask = 1.

For clarity: if you had a 8 bit wide PIO and you connected the button to pio_input[6], then you'd had irq_bit_mask=0x40

IRQ line nr is involved only in alt_irq_register() call.