Module spi 

Serial Peripheral Interface (SPI) abstraction layer.

• SpiBus wraps a configured HAL SPI instance with 8-bit words.
• ChipSelect is an active-low GPIO output wrappr for manual CS control.

Structs

ChipSelect

Manual chip-select line, active-low, generic over any GPIO pin.

NoChipSelect

Stub chip-select for when no SPI connection is used. Panics if select() or deselect() is ever called.

SpiBus

Wrapper around an enabled HAL SPI instance (8-bit words).

Traits

CsControl

Trait for chip-select control, allowing real pins or a no-op stub.