Type Alias SpiBusWrapper 

pub type SpiBusWrapper = RefCell<SpiBusInner>;

Shared SPI bus wrapper type, selected by the active bus-sharing feature.

This type wraps SpiBusInner in a concurrency-safe container so that both the display and the SD card can share the same SPI2 peripheral:

Feature	Wrapper	Thread safety
RefCellBus	RefCell<SpiBusInner>	Single-core, no ISRs.
CriticalSectionBus	Mutex<RefCell<SpiBusInner>>	Safe with ISRs.
AtomicBus	AtomicCell<SpiBusInner>	Lock-free (blocking only).
AsyncBus	embassy_sync::Mutex<…>	Async-safe.

The wrapper lives in a 'static [StaticCell]; you receive a &'static SpiBusWrapper from init_bus and pass it to [make_device] for each peripheral.

Aliased Type

pub struct SpiBusWrapper { /* private fields */ }