nrf: improve SPI write-only speed, by making use of double buffering #562
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Outdated suggestions cannot be applied.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 SPI peripheral in the nrf chips support double buffering, which makes it possible to keep sending continuously. This change introduces double buffering on the nrf chips, which should improve SPI performance.
Tested on the pca10040 (nrf52832).
I'm not very happy with the code duplication but I didn't see a clean way to do it otherwise (suggestions welcome).
@conejoninja you may be interested in this: it should improve the performance of the hub75 driver.