usb_device.c: Fix EP buffer size limitation for isochronous endpoints #78
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
The buffer size for USB endpoints was previously limited by the endpoints buffer stride, which is 128 bytes * 2 for isochronous endpoints and 64 bytes for bulk transfers. According to the USB full-speed specification, the maximum frame size can go up to 1023 bytes. The RP2040 microcontroller has 4KB of DPSRAM, which can support this maximum frame size. This commit removes the 128 bytes * 2 limitation for isochronous endpoints, allowing support for the full 1023-byte frame size. Signed-off-by: Khoa Hoang <[email protected]>
maximus64
force-pushed
the
fix_usb_max_size
branch
from
9e5b9fe
to
6f54e2f
Compare
sctanf
added a commit
to sctanf/picoamp
that referenced
this pull request
Aug 22, 2024
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Outdated suggestions cannot be applied.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.
The buffer size for USB endpoints was previously limited by the endpoints buffer stride, which is 128 bytes * 2 for isochronous endpoints and 64 bytes for bulk transfers.
According to the USB full-speed specification, the maximum frame size can go up to 1023 bytes. The RP2040 microcontroller has 4KB of DPSRAM, which can support this maximum frame size.
This commit removes the 128 bytes * 2 limitation for isochronous endpoints, allowing support for the full 1023-byte frame size.