Add traits for CAN FD #723
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mickeprag
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Jan 23, 2026
mickeprag
commented
- Implement CAN FD frame
- Implement a CAN FD interface
liamkinne
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liamkinne
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Just some thoughts on this implementation.
embedded-can/src/blocking.rs
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| fn transmit_fd(&mut self, frame: &Self::FDFrame) -> Result<(), Self::Error>; | ||
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| /// Blocks until a fd frame was received or an error occurred. | ||
| fn receive_fd(&mut self) -> Result<Self::FDFrame, Self::Error>; |
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How does this work for receivers that want to receive both FD and non-FD frames? By your description this would only return FD frames.
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Should we perhaps return an enum that can handle both frame types?
| fn dlc(&self) -> usize; | ||
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| /// Returns the length of the frame data in bytes. | ||
| fn length(&self) -> usize { |
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Is this any different to .data().len()? I'm assuming it would be implemented that way anyway.
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The length will be derived from the dlc. So the .data() function must read the dlc anyway to be able to return the correct length for the slice. Doing .data().len() needs to call dlc() internally anyway. I see no reason for the extra roundtrip creating a slice. I am providing a default implementation anyway so consumers of the trait does not need to implement it.
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To be honest, I rather think the implementation will be the other way around. Implementations of data() will be calling the length() method, instead of length() calling data()...
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