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Redmi Note 8 64Gb+6Gb Dual LTE
Руководство по эксплуатации Страница: 107

Xiaomi Redmi Note 8 64Gb+6Gb Dual LTE [107/132] Usb host mode

be able to upgrade to the future platform releases.

[SR] STRONGLY RECOMMENDED to not support proprietary charging methods that modify

Vbus voltage beyond default levels, or alter sink/source roles as such may result in

interoperability issues with the chargers or devices that support the standard USB Power

Delivery methods. While this is called out as "STRONGLY RECOMMENDED", in future

Android versions we might REQUIRE all type-C devices to support full interoperability with

standard type-C chargers.

[SR] STRONGLY RECOMMENDED to support Power Delivery for data and power role

swapping when they support Type-C USB and USB host mode.

SHOULD support Power Delivery for high-voltage charging and support for Alternate

Modes such as display out.

SHOULD implement the Android Open Accessory (AOA) API and specification as

documented in the Android SDK documentation.

If device implementations include a USB port and implement the AOA specification, they:

[C-2-1] MUST declare support for the hardware feature android.hardware.usb.accessory .

[C-2-2] The USB mass storage class MUST include the string "android" at the end of the

interface description iInterface string of the USB mass storage

SHOULD NOT implement AOAv2 audio documented in the Android Open Accessory

Protocol 2.0 documentation. AOAv2 audio is deprecated as of Android version 8.0 (API

level 26).

7.7.2. USB host mode

If device implementations include a USB port supporting host mode, they:

[C-1-1] MUST implement the Android USB host API as documented in the Android SDK

and MUST declare support for the hardware feature android.hardware.usb.host .

[C-1-2] MUST implement support to connect standard USB peripherals, in other words,

they MUST either:

Have an on-device type C port or ship with cable(s) adapting an on-device

proprietary port to a standard USB type-C port (USB Type-C device).

Have an on-device type A or ship with cable(s) adapting an on-device

proprietary port to a standard USB type-A port.

Have an on-device micro-AB port, which SHOULD ship with a cable adapting to

a standard type-A port.

[C-1-3] MUST NOT ship with an adapter converting from USB type A or micro-AB ports to

a type-C port (receptacle).

[SR] STRONGLY RECOMMENDED to implement the USB audio class as documented in the

Android SDK documentation.

SHOULD support charging the connected USB peripheral device while in host mode;

advertising a source current of at least 1.5A as specified in the Termination Parameters

section of the USB Type-C Cable and Connector Specification Revision 1.2 for USB Type-

C connectors or using Charging Downstream Port(CDP) output current range as specified

in the USB Battery Charging specifications, revision 1.2 for Micro-AB connectors.

SHOULD implement and support USB Type-C standards.

If device implementations include a USB port supporting host mode and the USB audio class, they:

[C-2-1] MUST support the USB HID class .

[C-2-2] MUST support the detection and mapping of the following HID data fields

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Xiaomi Redmi Note 8 64Gb+6Gb Dual LTE [107/132] Usb host mode

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