ASF USB Device HID Keyboard

Human interface on SAMD21-XPlain:

Introduction

This example shows how to implement a USB Device HID Keyboard on Atmel MCU with USB module. The application note AVR4904 http://ww1.microchip.com/downloads/en/appnotes/doc8446.pdf provides information about this implementation.

Startup

The example uses the buttons or sensors available on the board to simulate a standard keyboard. After loading firmware, connect the board (EVKxx,Xplain,...) to the USB Host. When connected to a USB host system this application provides a keyboard application in the Unix/Mac/Windows operating systems. This example uses the native HID driver for these operating systems.

• LED0 blinks when USB host has checked and enabled HID Keyboard interface
• The SW0 opens a notepad application on Windows O.S. and sends key sequence "Atmel ARM"
• Only SW0 will generate a wakeup to USB Host in remote wakeup mode.

About example

The example uses the following module groups:

• Basic modules: Startup, board, clock, interrupt, power management
• USB Device stack and HID modules:
  services/usb/
  services/usb/udc/
  services/usb/class/hid/
  services/usb/class/hid/keyboard/
• Specific implementation:
  • main.c,
    initializes clock
    initializes interrupt
    manages UI
  • specific implementation for each target "./examples/product_board/":
    • conf_foo.h configuration of each module
    • ui.c implement of user's interface (buttons, leds)