examples/lorawan: drop crazy STM32 hack#20883
Merged
benpicco merged 1 commit intoRIOT-OS:masterfrom Oct 1, 2024
Merged
Conversation
We cannot just decrement the reference counter of power modes without any coordination. First, this will trigger an `assert()`ion on non STM32 MCUs that have power modes that are not used (the ref count would be decremented below zero). Second, there hopefully is a reason a certain power mode is blocked, e.g. because a periph driver needs a certain clock to function. Likely the `periph_uart` driver on STM32 boards keeps power modes blocked after TX is completed even when no RX callback is present, which is the waste of power this hack tries to address. But that should be addressed there.
maribu
added
Type: bug
benpicco
approved these changes
Oct 1, 2024
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
3 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Contribution description
We cannot just decrement the reference counter of power modes without any coordination. First, this will trigger an
assert()ion on non STM32 MCUs that have power modes that are not used (the ref count would be decremented below zero). Second, there hopefully is a reason a certain power mode is blocked, e.g. because a periph driver needs a certain clock to function.Likely the
periph_uartdriver on STM32 boards keeps power modes blocked after TX is completed even when no RX callback is present, which is the waste of power this hack tries to address. But that should be addressed there.Testing procedure
With
masteronwemos-zerowe get:With this PR, we get:
Issues/PRs references
#17895