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facine / easyBlack

Beaglebone Black C++ Library for GPIO using high performance of mmap.
MIT License
17 stars 7 forks source link

External interrupts handling #2

Closed bremenpl closed 9 years ago

bremenpl commented 9 years ago

Hello, I was wondering either you are planning on adding external interrupts handling on pins in your library? That feature would help me a lot right now and I think its a great feature in general. I would aprichiate some info :).

facine commented 9 years ago

I'm not sure if I want to implement interruptions, but anyway you could use this other library for that: https://github.com/jackmitch/libsoc

The only way to get interrupts in user-space are using the kernel drivers and watches a state file in the sysfs to implement the interrupt. That may work, but is slow and need a lot of resources.

bremenpl commented 9 years ago

Is there really no other way? That would be a real bummer for me :/. Why dont you want to implement interrupts if I may ask?

facine commented 9 years ago

I could get to implement it in the future, but do not think is very necessary because it is not very difficult to implement it: http://www.linux.com/learn/tutorials/765810-beaglebone-black-how-to-get-interrupts-through-linux-gpio

bremenpl commented 9 years ago

Yes, but those are the "fake" interrupts. Its pooling, not a real interrupt. Isnt there a way to pass an interrupt event to user application?

facine commented 9 years ago

As far as I know, the only way to get a direct interruption is via kernel module.

bremenpl commented 9 years ago

I see. Is there any difference in a standard user application and a kernel module?

facine commented 9 years ago

http://www.tldp.org/LDP/lkmpg/2.4/html/x437.html

bremenpl commented 9 years ago

Thank you for help :).

W dniu 2014-11-24 o 20:13, facine pisze:

http://www.tldp.org/LDP/lkmpg/2.4/html/x437.html

— Reply to this email directly or view it on GitHub https://github.com/facine/easyBlack/issues/2#issuecomment-64246655.

Bremenpl