README.rst
1.. zephyr:code-sample:: usb-hid-mouse
2 :name: USB HID mouse
3 :relevant-api: _usb_device_core_api usb_hid_device_api input_interface
4
5 Implement a basic HID mouse device.
6
7Overview
8********
9
10This sample app demonstrates use of a USB Human Interface Device (HID) driver
11by the Zephyr project. This very simple driver enumerates a board with a button
12into a mouse that has a left mouse button and optionally (depending on
13the number of buttons on the board) a right mouse button, X-axis movement,
14and Y-axis movement.
15If the USB peripheral driver supports remote wakeup feature, wakeup request
16will be performed on every button click if the bus is in suspended state.
17This sample can be found under :zephyr_file:`samples/subsys/usb/hid-mouse` in the
18Zephyr project tree.
19
20Requirements
21************
22
23This project requires an USB device driver and uses the :ref:`input` API.
24There must be a :dtcompatible:`gpio-keys` group of buttons or keys defined at
25the board level that can generate input events, otherwise the example will build
26but not work as expected.
27
28The key mapping in the sample is as follows:
29
30- ``INPUT_KEY_0``: left button
31- ``INPUT_KEY_1``: right button
32- ``INPUT_KEY_2``: move the mouse along the x-axis
33- ``INPUT_KEY_3``: move the mouse along the y-axis
34
35An LED must also be configured via the ``led0`` devicetree alias. You may also
36see this error if you try to build this sample for an unsupported board:
37
38.. code-block:: none
39
40 Unsupported board: led0 devicetree alias is not defined
41
42Building and Running
43********************
44
45This sample can be built for multiple boards, in this example we will build it
46for the nucleo_f070rb board:
47
48.. zephyr-app-commands::
49 :zephyr-app: samples/subsys/usb/hid-mouse
50 :board: nucleo_f070rb
51 :goals: build
52 :compact:
53
54After you have built and flashed the sample app image to your board, plug the
55board into a host device, for example, a PC running Linux.
56The board will be detected as shown by the Linux dmesg command:
57
58.. code-block:: console
59
60 dmesg | tail -10
61 usb 2-2: new full-speed USB device number 2 using at91_ohci
62 usb 2-2: New USB device found, idVendor=2fe3, idProduct=0007, bcdDevice= 2.03
63 usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
64 usb 2-2: Product: Zephyr HID mouse sample
65 usb 2-2: Manufacturer: ZEPHYR
66 usb 2-2: SerialNumber: 86FE679A598AC47A
67 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
68 hid-generic 0003:2FE3:0100.0001: input: USB HID v1.10 Mouse [ZEPHYR Zephyr HID mouse sample] on usb-at91-2/input0
69
70You can also monitor mouse events by using the standard Linux ``evtest`` command
71(see the `Ubuntu evtest man page`_ for more information about this tool):
72
73.. _Ubuntu evtest man page:
74 http://manpages.ubuntu.com/manpages/trusty/man1/evtest.1.html
75
76.. code-block:: console
77
78 sudo evtest /dev/input/event0
79 Input driver version is 1.0.1
80 Input device ID: bus 0x3 vendor 0x2fe3 product 0x7 version 0x110
81 Input device name: "ZEPHYR Zephyr HID mouse sample"
82 Supported events:
83 Event type 0 (EV_SYN)
84 Event type 1 (EV_KEY)
85 Event code 272 (BTN_LEFT)
86 Event code 273 (BTN_RIGHT)
87 Event code 274 (BTN_MIDDLE)
88 Event type 2 (EV_REL)
89 Event code 0 (REL_X)
90 Event code 1 (REL_Y)
91 Event code 8 (REL_WHEEL)
92 Event type 4 (EV_MSC)
93 Event code 4 (MSC_SCAN)
94 Properties:
95 Testing ... (interrupt to exit)
96
97When you press the button on your board, it will act as if the left
98mouse button was pressed, and this information will be displayed
99by ``evtest``:
100
101.. code-block:: console
102
103 Event: time 1167609663.618515, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
104 Event: time 1167609663.618515, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
105 Event: time 1167609663.618515, -------------- SYN_REPORT ------------
106 Event: time 1167609663.730510, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
107 Event: time 1167609663.730510, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
108 Event: time 1167609663.730510, -------------- SYN_REPORT ------------
109
110If your board has more than one button, they will act as right mouse button,
111X-axis movement, and Y-axis movement.
112
