Comments (3)
I don't think #35 should have closed this issue.
While it's possible to monitor multiple lines for events, it's not nearly as ergonomic as the single line API.
I would personally love to see something like the Line::events()
and LineEventHandle
iterator implemented for Lines
and (a new?) MultiLineEventHandle
.
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Polling using your mechanism of choice is fine -- Providing a way to conveniently integrate this lib with tokio is not in the lib today but is something that probably should be added (probably behind a feature flag).
Events on the GPIO are queued using cdev so you will not miss them unless you really are not keeping up in your userspace application. Each event comes with a timestamp
from interrupt context which is what should be used if you care about when an event really happened.
If the lines are on the same gpiochip you can read multiple using a MultiLineHandle (see https://github.com/rust-embedded/gpio-cdev/blob/master/examples/multiread.rs). The equivalent of events
on this type of handle is not implemented at present although I think it should be possible (though I haven't tested this).
from gpio-cdev.
The equivalent of
events
on this type of handle is not implemented at present although I think it should be possible (though I haven't tested this).
Could you please provide a pointer to the docs of the C API that specify how to do it?
I am really interested in this and could provide a PR.
I would test it reading the two lines of a quadrature encoder (this is the use case I have).
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Related Issues (20)
- gpio-cdev = { version = "0.3", features = ["async-tokio"] } fails HOT 4
- GPIO electrical configuration HOT 6
- How would one configure a PWM using this crate? HOT 4
- Non-blocking polling of events HOT 2
- Update to Tokio 1 HOT 1
- Switch CI to GitHub Actions HOT 2
- Does Line.request()'s default arg matter for Input lines? HOT 1
- Is kernel event queueing per-process? HOT 1
- Seeming deadlock on select! HOT 9
- Please include Async documentation on docs.rs HOT 5
- possible to target wasm32-wasi? HOT 6
- Error: "There is no reactor running, must be called from the context of a Tokio 0.2.x runtime" from tokio::task::spawn HOT 1
- Servo example? HOT 1
- Support uAPI v2 HOT 13
- Fix CI HOT 1
- New release? HOT 1
- Control the mode or peripheral function aka alternate mode of GPIO PINs. HOT 3
- Ambiguity of Line.request()'s default arg polarity in light of ACTIVE_LOW outputs HOT 5
- Example for async multiread
- Fix CI
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