.. _usb_hid-mouse:

USB HID mouse Sample Application
################################

Overview
********

This sample app demonstrates use of a USB Human Interface Device (HID) driver
by the Zephyr project. This very simple driver enumerates a board with a button
into a mouse that has a left mouse button and optionally (depending on
the number of buttons on the board) a right mouse button, X-axis movement,
and Y-axis movement.
If the USB peripheral driver supports remote wakeup feature, wakeup request
will be performed on every button click if the bus is in suspended state.
This sample can be found under :zephyr_file:`samples/subsys/usb/hid-mouse` in the
Zephyr project tree.

Requirements
************

This project requires an USB device driver, and there must has at least one
GPIO button in your board.

To use this sample, you will require a board that defines the user switch in its
header file. The :file:`board.h` must define the following variables:

- DT_GPIO_LABEL(DT_ALIAS(sw0), gpios)
- DT_GPIO_PIN(DT_ALIAS(sw0), gpios)

The following variables are optional and depend on available board buttons:

- For right-button: DT_GPIO_LABEL(DT_ALIAS(sw1), gpios), DT_GPIO_PIN(DT_ALIAS(sw1), gpios)
- For X-axis: DT_GPIO_LABEL(DT_ALIAS(sw2), gpios), DT_GPIO_PIN(DT_ALIAS(sw2), gpios)
- For Y-axis: DT_GPIO_LABEL(DT_ALIAS(sw3), gpios), DT_GPIO_PIN(DT_ALIAS(sw3), gpios)

Building and Running
********************

This sample can be built for multiple boards, in this example we will build it
for the nucleo_f070rb board:

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/usb/hid-mouse
   :board: nucleo_f070rb
   :goals: build
   :compact:

After you have built and flashed the sample app image to your board, plug the
board into a host device, for example, a PC running Linux.
The board will be detected as shown by the Linux dmesg command:

.. code-block:: console

    dmesg | tail -10
    usb 2-2: new full-speed USB device number 2 using at91_ohci
    usb 2-2: New USB device found, idVendor=2fe3, idProduct=0100
    usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
    usb 2-2: Product: Zephyr HID mouse sample
    usb 2-2: Manufacturer: ZEPHYR
    usb 2-2: SerialNumber: 0.01
    input: ZEPHYR Zephyr HID mouse sample as /devices/soc0/ahb/600000.ohci/usb2/2-2/2-2:1.0/0003:2FE3:0100.0001/input/input0
    hid-generic 0003:2FE3:0100.0001: input: USB HID v1.10 Mouse [ZEPHYR Zephyr HID mouse sample] on usb-at91-2/input0

You can also monitor mouse events by using the standard Linux ``evtest`` command
(see the `Ubuntu evtest man page`_ for more information about this tool):

.. _Ubuntu evtest man page:
   http://manpages.ubuntu.com/manpages/trusty/man1/evtest.1.html

.. code-block:: console

    sudo evtest /dev/input/event0
    Input driver version is 1.0.1
    Input device ID: bus 0x3 vendor 0x2fe3 product 0x100 version 0x110
    Input device name: "ZEPHYR USB-DEV"
    Supported events:
      Event type 0 (EV_SYN)
      Event type 1 (EV_KEY)
        Event code 272 (BTN_LEFT)
        Event code 273 (BTN_RIGHT)
        Event code 274 (BTN_MIDDLE)
      Event type 2 (EV_REL)
        Event code 0 (REL_X)
        Event code 1 (REL_Y)
        Event code 8 (REL_WHEEL)
      Event type 4 (EV_MSC)
        Event code 4 (MSC_SCAN)
    Properties:
    Testing ... (interrupt to exit)

When you press the button on your board, it will act as if the left
mouse button was pressed, and this information will be displayed
by ``evtest``:

.. code-block:: console

    Event: time 1167609663.618515, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
    Event: time 1167609663.618515, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
    Event: time 1167609663.618515, -------------- SYN_REPORT ------------
    Event: time 1167609663.730510, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
    Event: time 1167609663.730510, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
    Event: time 1167609663.730510, -------------- SYN_REPORT ------------

If your board has more than one button, they will act as right mouse button,
X-axis movement, and Y-axis movement.