Buttons Input

Component Type: Input

Status: Implemented

Overview

CIOButtons is a button input object that packs button states as bits in a uint32_t value.

Implementation

CIOButtons opens the buttons character device at /dev/buttons<devno> during configure() and reads a packed uint32_t bitmap on getData(). Each bit reports one button channel. The buffer’s timestamp is populated when CONFIG_DAWN_IO_TIMESTAMP is enabled. Batch reads are not supported (multi-sample requests return -ENOTSUP); push notifications are wired through CIONotifier when CONFIG_DAWN_IO_NOTIFY is enabled.

Configuration

Kconfig

CONFIG_DAWN_IO_BUTTONS: enables button-backed IO objects.

YAML

ios:
  - id: buttons1
    type: buttons

This IO returns the current button bitmap as a uint32_t value.

External Control

ControlIO: not supported.

TriggerIO: not supported.

Doxygen

dawn::CIOButtons