de33180236
Some versions of gcc, in some cases, decide that it is OK to move the read to `INTR` to right after clearing the `SETUP_REC` bit of `SIE_STATUS`, instead of after the `memcpy`. The rp2040 datasheet doesn't appear to say anything about how quickly the `SETUP_REC` bit will be cleared in `INTR`, but regardless the compiler should not be re-ordering the read like this. Here we force the correct ordering using a memory barrier. Signed-off-by: Lasse Dalegaard <dalegaard@gmail.com>
Welcome to the Klipper project!
Klipper is a 3d-Printer firmware. It combines the power of a general purpose computer with one or more micro-controllers. See the features document for more information on why you should use Klipper.
To begin using Klipper start by installing it.
Klipper is Free Software. See the license or read the documentation.