Simply delayNano Mod Add delayCycles #387
Open
Conversation
This file contains 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
Demonstrated in https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=212280&viewfull=1#post212280 Does this have possible utility worthy of supporting?
Did a compare of overhead factor -10 to -13 and change to -11 tracks better. Did a loop of 20 passes of 5 inline calls and divided the CycCnt /100 - using offset of -10 tracks better than -12. >> uint32_t begin = ARM_DWT_CYCCNT-10; // Overhead Factor for execution Calling delayCycles() cusps on groups of 4 cycles because of while(). returns in 6 cycles up to 13 then 15 cycles up to 21 then 23 and counting cycles starting at 22 in groups of 4. * integer math rounded down - put table in the forum post. Tested at 600 and 300 MHz and looked the same - of course that is twice as long :)
|
It would need tweaking to work on T_3.x's |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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Outdated suggestions cannot be applied.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.
Demonstrated in https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=212280&viewfull=1#post212280
Does this have possible utility worthy of supporting?