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Altera_Forum's avatar
Altera_Forum
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15 years ago

uClinux Interrupt issues

I have a custom component that I'm connecting to the nios2 with a PIO bridge. The component is essentially a selectable timer that I'm using as a trigger throughout the whole device, the same trigger...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

So I ended up solving the problem. After thoroughly reading the PIO core datasheet, I learned that I have to clear the interrupts after handling it, otherwise the system will keep interrupting.

As for the stalling issue, I had a buffer in the driver to buffer ~100 acquisitions (so user space programs had some time to react). And it seems that There wasn't enough heap space left on my DE2 sdram, after a few triggers it started eating into some vital kernel component and stalling the system.

On a related note. Does anyone know the best way to notify a userland program that an interrupt has occurred? I need to somehow send out my acquired data through either USB or ethernet, and I want to wake the sending process after an interrupt has occured and get it to read the buffer and send the data along to my computer for recording.