USB Usage Guidelines
The following procedure uses bulk transfer as an example.
Procedure
- Obtain a USB service instance.
static OHOS::USB::UsbSrvClient &g_usbClient = OHOS::USB::UsbSrvClient::GetInstance();
- Obtain the USB device list.
std::vector<OHOS::USB::UsbDevice> deviceList;
int32_t ret = g_usbClient.GetDevices(deviceList);
- Apply for device access permissions.
int32_t ret = g_usbClient.RequestRight(device.GetName());
- Open the USB device.
USBDevicePipe pip;
int32_t et = g_usbClient.OpenDevice(device, pip);
- Configure the USB interface.
ret = g_usbClient.ClaimInterface(pip, interface, true); // **interface** indicates an interface of the USB device in **deviceList**.
- Transfer data.
srvClient.BulkTransfer(pipe, endpoint, vdata, timeout);
Parameter description:
- pipe: pipe for data transfer of the USB device opened.
- endpoint: endpoint for data transfer on the USB device.
- vdata: binary data block to be transferred or read.
- timeout: timeout duration of data transfer.
- Close the USB device.
ret = g_usbClient.Close(pip);
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