boards/adafruit-itsybitsy-m4: turn off APA102 LED on startup #19357
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Contribution description
adafruit-itsybitsy-m4
comes with a serial APA102 that is left on by the bootloader.It's really bright and the only way to turn it off is by communication with it through it's SPI interface.
We have a proper driver for it, but pulling that in unconditionally feels wrong.
Instead just bit-bang the simple protocol on startup set all colors + alpha to 0.
Testing procedure
adafruit-itsybitsy-m4
no longer glows blindingly pink.tests/driver_apa102
still does it's fadingIssues/PRs references