pw::spi::ChipSelector Class Reference

Overview

The ChipSelector class provides an abstract interface for controlling the chip-select signal associated with a specific SPI responder.

This interface provides a SetActive() method, which activates/deactivates the device based on the value of the active parameter. The associated Activate() and Deactivate() methods are utility wrappers for SetActive(true) and SetActive(false), respectively.

A concrete implementation of this interface class must be provided in order to use the SPI HAL to communicate with a responder.

Note

Active does not imply a specific logic-level; it is left to the implementor to correctly map logic-levels to the device's active/inactive states.

Inheritance diagram for pw::spi::ChipSelector:

Public Member Functions
virtual Status	SetActive (bool active)=0
Status	Activate ()
Status	Deactivate ()

Member Function Documentation

Activate()

Status pw::spi::ChipSelector::Activate ( )

inline

Helper method to activate the chip-select signal.

Returns

• OK: The chip-select signal was activated.
• Returns other implementation-specific values on failure.

Deactivate()

Status pw::spi::ChipSelector::Deactivate ( )

inline

Helper method to deactivate the chip-select signal.

Returns

• OK: The chip-select signal was deactivated.
• Returns other implementation-specific values on failure.

SetActive()

virtual Status pw::spi::ChipSelector::SetActive ( bool  active )

pure virtual

SetActive sets the state of the chip-select signal to the value represented by the active parameter. Passing a value of true will activate the chip-select signal, and false will deactivate the chip-select signal.

Returns

• OK: The state of the chip-select signal was set.
• Returns other implementation-specific values on failure.

Implemented in pw::spi::DigitalOutChipSelector, and pw::spi::MockChipSelector.

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The documentation for this class was generated from the following file:

• pw_spi/public/pw_spi/chip_selector.h