Macro pdf 

macro_rules! pdf {
    ($x: literal) => { ... };
}

Create a persistent default layer switch action.

Like df!, but the new default layer is saved to storage and restored on the next boot (requires the storage feature). This is the QMK PDF key.

Parameters

• $x: Layer number (0-255)

Example

pdf!(1)  // Set layer 1 as the default layer, persisting across reboots