109 lines
3.5 KiB
Markdown
109 lines
3.5 KiB
Markdown
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# HID/OTG
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By default, _scrcpy_ injects input events at the Android API level. As an
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alternative, when connected over USB, it is possible to send HID events, so that
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scrcpy behaves as if it was a physical keyboard and/or mouse connected to the
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Android device.
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A special [OTG](#otg) mode allows to control the device without mirroring (and
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without USB debugging).
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## Physical keyboard simulation
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By default, _scrcpy_ uses Android key or text injection. It works everywhere,
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but is limited to ASCII.
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Instead, it can simulate a physical USB keyboard on Android to provide a better
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input experience (using [USB HID over AOAv2][hid-aoav2]): the virtual keyboard
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is disabled and it works for all characters and IME.
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[hid-aoav2]: https://source.android.com/devices/accessories/aoa2#hid-support
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However, it only works if the device is connected via USB.
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Note: On Windows, it may only work in [OTG mode](#otg), not while mirroring (it
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is not possible to open a USB device if it is already open by another process
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like the _adb daemon_).
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To enable this mode:
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```bash
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scrcpy --hid-keyboard
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scrcpy -K # short version
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```
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If it fails for some reason (for example because the device is not connected via
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USB), it automatically fallbacks to the default mode (with a log in the
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console). This allows using the same command line options when connected over
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USB and TCP/IP.
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In this mode, raw key events (scancodes) are sent to the device, independently
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of the host key mapping. Therefore, if your keyboard layout does not match, it
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must be configured on the Android device, in Settings → System → Languages and
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input → [Physical keyboard].
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This settings page can be started directly:
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```bash
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adb shell am start -a android.settings.HARD_KEYBOARD_SETTINGS
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```
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However, the option is only available when the HID keyboard is enabled (or when
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a physical keyboard is connected).
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[Physical keyboard]: https://github.com/Genymobile/scrcpy/pull/2632#issuecomment-923756915
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## Physical mouse simulation
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By default, _scrcpy_ uses Android mouse events injection with absolute
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coordinates. By simulating a physical mouse, a mouse pointer appears on the
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Android device, and relative mouse motion, clicks and scrolls are injected.
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To enable this mode:
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```bash
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scrcpy --hid-mouse
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scrcpy -M # short version
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```
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When this mode is enabled, the computer mouse is "captured" (the mouse pointer
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disappears from the computer and appears on the Android device instead).
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Special capture keys, either <kbd>Alt</kbd> or <kbd>Super</kbd>, toggle
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(disable or enable) the mouse capture. Use one of them to give the control of
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the mouse back to the computer.
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## OTG
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It is possible to run _scrcpy_ with only physical keyboard and mouse simulation
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(HID), as if the computer keyboard and mouse were plugged directly to the device
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via an OTG cable.
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In this mode, `adb` (USB debugging) is not necessary, and mirroring is disabled.
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This is similar to `--hid-keyboard --hid-mouse`, but without mirroring.
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To enable OTG mode:
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```bash
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scrcpy --otg
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# Pass the serial if several USB devices are available
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scrcpy --otg -s 0123456789abcdef
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```
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It is possible to enable only HID keyboard or HID mouse:
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```bash
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scrcpy --otg --hid-keyboard # keyboard only
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scrcpy --otg --hid-mouse # mouse only
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scrcpy --otg --hid-keyboard --hid-mouse # keyboard and mouse
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# for convenience, enable both by default
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scrcpy --otg # keyboard and mouse
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```
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Like `--hid-keyboard` and `--hid-mouse`, it only works if the device is
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connected over USB.
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