Note

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USB HID Keyboard Example

Introduction

This example demonstrates three types of read methods for HID keyboard input devices: blocking read, non-blocking read, and poll event notification.

Source code location: src/rtsmart/examples/peripheral/usb_hid_kbd/test_hid.c

Example Behavior

• Default device node: /dev/hidk0

• Test1: Blocking read, waiting for key event frames

• Test2: Non-blocking read, verifying the EAGAIN branch

• Test3: poll() waits for POLLIN then reads the event

• Prints common key names and press/release status

Runtime Arguments

./test_hid [dev_path]

• dev_path: HID device node, default /dev/hidk0

Build and Run

cd src/rtsmart/examples/peripheral/usb_hid_kbd
make
./test_hid

Tip

There is currently no standalone HID keyboard page in the API reference; you may first refer to the Peripheral API Index.