Adjust stepping and CPU map to eschew rewiring. #1
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
Very simple really, GRBL does its step timing calculations and scheduling on one set of bitmasks, therefore in the original setup, all GPIO pins for each operation must be on the same port. However, it is simple enough to create the bitmask as 32-bits wide, let GRBL do all its math, and then split it in half and write it to two separate ports as necessary.
Author
|
Note that you don't have a branch to separate out the USBMach from whatever custom board you're moving on toward, and I don't know how to tell this silly thing to merge further back. I don't know if you care about this board any more, but they seem plentiful and cheap online, so having software for them that actually works is nice. Can you tell me how to make the spindle control on this actually work? I can't manage to sort out what pins it's attached to. |
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Outdated suggestions cannot be applied.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.
Very simple really, GRBL does its step timing calculations and scheduling on one set of bitmasks,
therefore in the original setup, all GPIO pins for each operation must be on the same port.
However, it is simple enough to create the bitmask as 32-bits wide, let GRBL do all its math,
and then split it in half and write it to two separate ports as necessary.
I may expand this approach to additional functions as I continue to suss out which pins are attached to what.