ws2812: support high-MHz ARMv6M chips like the RP2040#391
Merged
deadprogram merged 1 commit intodevfrom Mar 10, 2022
Merged
Conversation
The possible branch distance is a lot shorter on ARMv6M (Cortex-M and Cortex-M0+) for conditional branches. Therefore, convert this long conditional branch into an unconditional branch. This probably makes the code a little bit slower but because it is in the low period of the WS2812 signal it shouldn't matter for the protocol. And it avoids difficult workarounds specifically for the RP2040.
Member
|
Thanks @aykevl |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
The possible branch distance is a lot shorter on ARMv6M (Cortex-M and Cortex-M0+) for conditional branches. Therefore, convert this long conditional branch into an unconditional branch.
This probably makes the code a little bit slower but because it is in the low period of the WS2812 signal it shouldn't matter for the protocol. And it avoids difficult workarounds specifically for the RP2040.