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adc861ba
编写于
8月 15, 2022
作者:
S
shawn_he
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shawn_he
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en/application-dev/reference/apis/js-apis-usb.md
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en/application-dev/reference/apis/js-apis-usb.md
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@@ -593,3 +593,68 @@ Enumerates request directions.
| -------- | -------- | -------- |
| USB_REQUEST_DIR_TO_DEVICE | 0 | Request for writing data from the host to the device. |
| USB_REQUEST_DIR_FROM_DEVICE | 0x80 | Request for reading data from the device to the host. |
## FunctionType<sup>9+</sup>
Enumerates function types for the USB device.
This is a system API.
**System capability**
: SystemCapability.USB.USBManager
| Name | Value | Description |
| ------------ | ---- | ---------- |
| NONE | 0 | No function.|
| ACM | 1 | ACM function. |
| ECM | 2 | ECM function. |
| HDC | 4 | HDC function. |
| MTP | 8 | Not supported currently.|
| PTP | 16 | Not supported currently.|
| RNDIS | 32 | Not supported currently.|
| MIDI | 64 | Not supported currently.|
| AUDIO_SOURCE | 128 | Not supported currently.|
| NCM | 256 | Not supported currently.|
## PortModeType<sup>9+</sup>
Enumerates USB port mode types.
This is a system API.
**System capability**
: SystemCapability.USB.USBManager
| Name | Value | Description |
| --------- | ---- | ---------------------------------------------------- |
| NONE | 0 | None. |
| UFP | 1 | Upstream facing port, which functions as the sink of power supply. |
| DFP | 2 | Downstream facing port, which functions as the source of power supply. |
| DRP | 3 | Dynamic reconfiguration port (DRP), which can function as the DFP (host) or UFP (device). It is not supported currently.|
| NUM_MODES | 4 | Not supported currently. |
## PowerRoleType<sup>9+</sup>
Enumerates power role types.
This is a system API.
**System capability**
: SystemCapability.USB.USBManager
| Name | Value | Description |
| ------ | ---- | ---------- |
| NONE | 0 | None. |
| SOURCE | 1 | External power supply.|
| SINK | 2 | Internal power supply.|
## DataRoleType<sup>9+</sup>
Enumerates data role types.
This is a system API.
**System capability**
: SystemCapability.USB.USBManager
| Name | Value | Description |
| ------ | ---- | ------------ |
| NONE | 0 | None. |
| HOST | 1 | USB host.|
| DEVICE | 2 | USB device.|
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