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update 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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# USB
> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
> **NOTE**<br>
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
## Modules to Import
......@@ -18,9 +18,9 @@ Obtains the USB device list.
**System capability**: SystemCapability.USB.USBManager
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| Array&lt;Readonly&lt;[USBDevice](#usbdevice)&gt;&gt; | Device information list.|
| Array&lt;Readonly&lt;[USBDevice](#usbdevice)&gt;&gt; | Device information list. |
- **Example**
```js
......@@ -90,14 +90,14 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| device | [USBDevice](#usbdevice) | Yes| USB device information.|
| device | [USBDevice](#usbdevice) | Yes | USB device information. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| Readonly&lt;[USBDevicePipe](#usbdevicepipe)&gt; | USB device pipe for data transfer.|
| Readonly&lt;[USBDevicePipe](#usbdevicepipe)&gt; | USB device pipe for data transfer. |
- **Example**
```js
......@@ -115,14 +115,14 @@ Checks whether the application has the permission to access the device.
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| deviceName | string | Yes| Device name.|
| deviceName | string | Yes | Device name. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| boolean | Returns **true** if the application has the permission to access the device; returns **false** otherwise.|
| boolean | Returns **true** if the application has the permission to access the device; returns **false** otherwise. |
- **Example**
```js
......@@ -141,14 +141,14 @@ Requests the temporary permission for the application to access the USB device.
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| deviceName | string | Yes| Device name.|
| deviceName | string | Yes | Device name. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| Promise&lt;boolean&gt; | Returns **true** if the temporary device access permissions are granted; returns **false** otherwise.|
| Promise&lt;boolean&gt; | Returns **true** if the temporary device access permissions are granted; returns **false** otherwise. |
- **Example**
```js
......@@ -170,16 +170,16 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| iface | [USBInterface](#usbinterface) | Yes| USB interface, which is used to determine the index of the interface to claim.|
| force | boolean | No| Whether to forcibly claim the USB interface. The default value is **false**, indicating not to forcibly claim the USB interface.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | Device pipe, which is used to determine the bus number and device address. |
| iface | [USBInterface](#usbinterface) | Yes | USB interface, which is used to determine the index of the interface to claim. |
| force | boolean | No | Whether to forcibly claim the USB interface. The default value is **false**, indicating not to forcibly claim the USB interface. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| number | Returns **0** if the USB interface is successfully claimed; returns an error code otherwise.|
| number | Returns **0** if the USB interface is successfully claimed; returns an error code otherwise. |
- **Example**
```js
......@@ -199,15 +199,15 @@ Before you do this, ensure that you have claimed the interface by calling [usb.c
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| iface | [USBInterface](#usbinterface) | Yes| USB interface, which is used to determine the index of the interface to release.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | Device pipe, which is used to determine the bus number and device address. |
| iface | [USBInterface](#usbinterface) | Yes | USB interface, which is used to determine the index of the interface to release. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| number | Returns **0** if the USB interface is successfully released; returns an error code otherwise.|
| number | Returns **0** if the USB interface is successfully released; returns an error code otherwise. |
- **Example**
```js
......@@ -227,15 +227,15 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| config | [USBConfig](#usbconfig) | Yes| USB configuration to set.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | Device pipe, which is used to determine the bus number and device address. |
| config | [USBConfig](#usbconfig) | Yes | USB configuration to set. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| number | Returns **0** if the USB configuration is successfully set; returns an error code otherwise.|
| number | Returns **0** if the USB configuration is successfully set; returns an error code otherwise. |
- **Example**
```js
......@@ -255,15 +255,15 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| iface | [USBInterface](#usbinterface) | Yes| USB interface to set.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | Device pipe, which is used to determine the bus number and device address. |
| iface | [USBInterface](#usbinterface) | Yes | USB interface to set. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| number | Returns **0** if the USB interface is successfully set; returns an error code otherwise.|
| number | Returns **0** if the USB interface is successfully set; returns an error code otherwise. |
- **Example**
```js
......@@ -283,14 +283,14 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | Device pipe, which is used to determine the bus number and device address. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| Uint8Array | Raw descriptor data.|
| Uint8Array | Raw descriptor data. |
- **Example**
```js
......@@ -309,14 +309,14 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | Device pipe, which is used to determine the bus number and device address. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| number | File descriptor of the USB device.|
| number | File descriptor of the USB device. |
- **Example**
```js
......@@ -335,16 +335,16 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
| contrlparam | [USBControlParams](#usbcontrolparams) | Yes| Control transfer parameters.|
| timeout | number | No| Timeout duration. The default value is **0**, indicating no timeout.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | USB device pipe, which is used to determine the USB device. |
| contrlparam | [USBControlParams](#usbcontrolparams) | Yes | Control transfer parameters. |
| timeout | number | No | Timeout duration. The default value is **0**, indicating no timeout. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| Promise&lt;number&gt; | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs.|
| Promise&lt;number&gt; | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs. |
- **Example**
```js
......@@ -365,17 +365,17 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
| endpoint | [USBEndpoint](#usbendpoint) | Yes| USB endpoint, which is used to determine the USB port for data transfer.|
| buffer | Uint8Array | Yes| Buffer for writing or reading data.|
| timeout | number | No| Timeout duration. The default value is **0**, indicating no timeout.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | USB device pipe, which is used to determine the USB device. |
| endpoint | [USBEndpoint](#usbendpoint) | Yes | USB endpoint, which is used to determine the USB port for data transfer. |
| buffer | Uint8Array | Yes | Buffer for writing or reading data. |
| timeout | number | No | Timeout duration. The default value is **0**, indicating no timeout. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| Promise&lt;number&gt; | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs.|
| Promise&lt;number&gt; | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs. |
- **Example**
```js
......@@ -399,14 +399,14 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
**System capability**: SystemCapability.USB.USBManager
- **Parameters**
| Name| Type| Mandatory| Description|
| Name | Type | Mandatory | Description |
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe.|
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes | USB device pipe. |
- **Return value**
| Type| Description|
| Type | Description |
| -------- | -------- |
| number | Returns **0** if the USB device pipe is closed successfully; returns an error code otherwise.|
| number | Returns **0** if the USB device pipe is closed successfully; returns an error code otherwise. |
- **Example**
```js
......@@ -421,16 +421,16 @@ Represents the USB endpoint from which data is sent or received. You can obtain
**System capability**: SystemCapability.USB.USBManager
| Name| Type| Description|
| -------- | -------- | -------- |
| address | number | Endpoint address.|
| attributes | number | Endpoint attributes.|
| interval | number | Endpoint interval.|
| maxPacketSize | number | Maximum size of data packets on the endpoint.|
| direction | [USBRequestDirection](#usbrequestdirection) | Endpoint direction.|
| number | number | Endpoint number.|
| type | number | Endpoint type.|
| interfaceId | number | Unique ID of the interface to which the endpoint belongs.|
| Name | Type | Description |
| -------- | -------- | -------- |
| address | number | Endpoint address. |
| attributes | number | Endpoint attributes. |
| interval | number | Endpoint interval. |
| maxPacketSize | number | Maximum size of data packets on the endpoint. |
| direction | [USBRequestDirection](#usbrequestdirection) | Endpoint direction. |
| number | number | Endpoint number. |
| type | number | Endpoint type. |
| interfaceId | number | Unique ID of the interface to which the endpoint belongs. |
## USBInterface
......@@ -439,15 +439,15 @@ Represents a USB interface. One [USBConfig](#usbconfig) can contain multiple **U
**System capability**: SystemCapability.USB.USBManager
| Name| Type| Description|
| -------- | -------- | -------- |
| id | number | Unique ID of the USB interface.|
| protocol | number | Interface protocol.|
| clazz | number | Device type.|
| subClass | number | Device subclass.|
| alternateSetting | number | Settings for alternating between descriptors of the same USB interface.|
| name | string | Interface name.|
| endpoints | Array&lt;[USBEndpoint](#usbendpoint)&gt; | Endpoints that belong to the USB interface.|
| Name | Type | Description |
| -------- | -------- | -------- |
| id | number | Unique ID of the USB interface. |
| protocol | number | Interface protocol. |
| clazz | number | Device type. |
| subClass | number | Device subclass. |
| alternateSetting | number | Settings for alternating between descriptors of the same USB interface. |
| name | string | Interface name. |
| endpoints | Array&lt;[USBEndpoint](#usbendpoint)&gt; | Endpoints that belong to the USB interface. |
## USBConfig
......@@ -456,15 +456,15 @@ Represents the USB configuration. One [USBDevice](#usbdevice) can contain multip
**System capability**: SystemCapability.USB.USBManager
| Name| Type| Description|
| -------- | -------- | -------- |
| id | number | Unique ID of the USB configuration.|
| attributes | number | Configuration attributes.|
| maxPower | number | Maximum power consumption, in mA.|
| name | string | Configuration name, which can be left empty.|
| isRemoteWakeup | boolean | Support for remote wakeup.|
| isSelfPowered | boolean | Support for independent power supplies.|
| interfaces | Array&nbsp;&lt;[USBInterface](#usbinterface)&gt; | Supported interface attributes.|
| Name | Type | Description |
| -------- | -------- | -------- |
| id | number | Unique ID of the USB configuration. |
| attributes | number | Configuration attributes. |
| maxPower | number | Maximum power consumption, in mA. |
| name | string | Configuration name, which can be left empty. |
| isRemoteWakeup | boolean | Support for remote wakeup. |
| isSelfPowered | boolean | Support for independent power supplies. |
| interfaces | Array&nbsp;&lt;[USBInterface](#usbinterface)&gt; | Supported interface attributes. |
## USBDevice
......@@ -473,21 +473,21 @@ Represents USB device information.
**System capability**: SystemCapability.USB.USBManager
| Name| Type| Description|
| -------- | -------- | -------- |
| busNum | number | Bus address.|
| devAddress | number | Device address.|
| serial | string | Device SN.|
| name | string | Device name.|
| manufacturerName | string | Device manufacturer.|
| productName | string | Product information.|
| version | string | Version.|
| vendorId | number | Vendor ID.|
| productId | number | Product ID.|
| clazz | number | Device class.|
| subClass | number | Device subclass.|
| protocol | number | Device protocol code.|
| configs | Array&lt;[USBConfig](#usbconfig)&gt; | Device configuration descriptor information.|
| Name | Type | Description |
| -------- | -------- | -------- |
| busNum | number | Bus address. |
| devAddress | number | Device address. |
| serial | string | Device SN. |
| name | string | Device name. |
| manufacturerName | string | Device manufacturer. |
| productName | string | Product information. |
| version | string | Version. |
| vendorId | number | Vendor ID. |
| productId | number | Product ID. |
| clazz | number | Device class. |
| subClass | number | Device subclass. |
| protocol | number | Device protocol code. |
| configs | Array&lt;[USBConfig](#usbconfig)&gt; | Device configuration descriptor information. |
## USBDevicePipe
......@@ -496,10 +496,10 @@ Represents a USB device pipe, which is used to determine a USB device.
**System capability**: SystemCapability.USB.USBManager
| Name| Type| Description|
| -------- | -------- | -------- |
| busNum | number | Bus address.|
| devAddress | number | Device address.|
| Name | Type | Description |
| -------- | -------- | -------- |
| busNum | number | Bus address. |
| devAddress | number | Device address. |
## USBControlParams
......@@ -508,14 +508,14 @@ Represents control transfer parameters.
**System capability**: SystemCapability.USB.USBManager
| Name| Type| Description|
| -------- | -------- | -------- |
| request | number | Request type.|
| target | [USBRequestTargetType](#usbrequesttargettype) | Represents the request target type.|
| reqType | [USBControlRequestType](#usbcontrolrequesttype) | Request control type.|
| value | number | Request parameters|
| index | number | Index of the request parameter value.|
| data | Uint8Array | Buffer for writing or reading data.|
| Name | Type | Description |
| -------- | -------- | -------- |
| request | number | Request type. |
| target | [USBRequestTargetType](#usbrequesttargettype) | Represents the request target type. |
| reqType | [USBControlRequestType](#usbcontrolrequesttype) | Request control type. |
| value | number | Request parameters |
| index | number | Index of the request parameter value. |
| data | Uint8Array | Buffer for writing or reading data. |
## USBRequestTargetType
......@@ -524,12 +524,12 @@ Represents the request target type.
**System capability**: SystemCapability.USB.USBManager
| Name| Default Value | Description|
| -------- | -------- | -------- |
| USB_REQUEST_TARGET_DEVICE | 0 | Device.|
| USB_REQUEST_TARGET_INTERFACE | 1 | Interface.|
| USB_REQUEST_TARGET_ENDPOINT | 2 | Endpoint|
| USB_REQUEST_TARGET_OTHER | 3 | Others|
| Name | Default Value | Description |
| -------- | -------- | -------- |
| USB_REQUEST_TARGET_DEVICE | 0 | Device. |
| USB_REQUEST_TARGET_INTERFACE | 1 | Interface. |
| USB_REQUEST_TARGET_ENDPOINT | 2 | Endpoint |
| USB_REQUEST_TARGET_OTHER | 3 | Others |
## USBControlRequestType
......@@ -538,11 +538,11 @@ Enumerates control request types.
**System capability**: SystemCapability.USB.USBManager
| Name| Default Value | Description|
| -------- | -------- | -------- |
| USB_REQUEST_TYPE_STANDARD | 0 | Standard|
| USB_REQUEST_TYPE_CLASS | 1 | Class.|
| USB_REQUEST_TYPE_VENDOR | 2 | Vendor|
| Name | Default Value | Description |
| -------- | -------- | -------- |
| USB_REQUEST_TYPE_STANDARD | 0 | Standard |
| USB_REQUEST_TYPE_CLASS | 1 | Class. |
| USB_REQUEST_TYPE_VENDOR | 2 | Vendor |
## USBRequestDirection
......@@ -551,7 +551,7 @@ Enumerates request directions.
**System capability**: SystemCapability.USB.USBManager
| Name| Default Value | Description|
| -------- | -------- | -------- |
| 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.|
| Name | Default Value | Description |
| -------- | -------- | -------- |
| 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. |
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