add maybe_write() for lazy data closures on Endpoint and UsbBus #78
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An example of how it might simplify code that uses USB: mutantbob/imxrt-usbd@05c6584 |
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Wouldn't an |
simpkins
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This reverts commit c1210a9. (twitchyliquid64#34) This commit breaks the build since it attempts to use `EndpointIn` methods from a PR that were never landed in the usb-device crate: rust-embedded-community/usb-device#78
twitchyliquid64
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This reverts commit c1210a9. (#34) This commit breaks the build since it attempts to use `EndpointIn` methods from a PR that were never landed in the usb-device crate: rust-embedded-community/usb-device#78
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The
write()API forEndpointis a little clumsy because it returns an error if the write would block, forcing the code that invokes it to hang on to the buffer and retry later.This is a solution, but it adds method to the
UsbBustrait, forcing downstream implementers to update (see twitchyliquid64/usbd-hid#34 ).I am mostly trying to start a conversation about this so options (such as the ability to check
WouldBlockbefore callingwrite) can be discussed.