Change to allow the SAMD51 to enter deep sleep #19
Conversation
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
added 3 commits
March 8, 2019 10:58
Disable the SAMD51 USB peripheral's Run-On-Standby (RUNSTDBY bit) to allow the microcontroller to enter deep sleep on __WFI().
Disable the SAMD51 USB peripheral's Run-On-Standby (RUNSTDBY) mode to allow the microntroller to enter deep sleep on WFI().
ladyada
approved these changes
Mar 8, 2019
|
thanks! |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
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Outdated suggestions cannot be applied.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 SAMD51 core currently doesn't allow the microcontroller to sleep using the ARM WFI() function.
The reason is that SAMD51's USB peripheral is set to Run-On-Standby. Clearing the USB peripheral's RUNSTDBY bit allows the microcontroller to enter deep sleep on receiving the WFI() command.
The SAMD21 by contrast doesn't exhibit this behaviour and remains unaffected, irrespective of the RUNSTDBY bit state (0 or 1).
The suggested change is to the WatchdogSAMD::_initialize_wdt() function in the "WatchdogSAMD.cpp" file.