harmony 鸿蒙UsbDeviceMemMap
UsbDeviceMemMap
Overview
Device memory map created by calling OH_Usb_CreateDeviceMemMap(). A buffer using the device memory map can provide better performance.
Since
10
Related Modules
Header file: usb_ddk_types.h
Summary
Member Variables
| Name | Description |
|---|---|
| address | Buffer address. |
| size | Buffer size. |
| offset | Offset of the used buffer. The default value is 0, indicating that there is no offset and the buffer starts from the specified address. |
| bufferLength | Length of the used buffer. By default, the value is equal to the size, indicating that the entire buffer is used. |
| transferedLength | Length of the transferred data. |
Member Variable Description
address
uint8_t* const UsbDeviceMemMap::address
Description
Buffer address.
bufferLength
uint32_t UsbDeviceMemMap::bufferLength
Description
Length of the used buffer. By default, the value is equal to the size, indicating that the entire buffer is used.
offset
uint32_t UsbDeviceMemMap::offset
Description
Offset of the used buffer. The default value is 0, indicating that there is no offset and the buffer starts from the specified address.
size
const size_t UsbDeviceMemMap::size
Description
Buffer size.
transferedLength
uint32_t UsbDeviceMemMap::transferedLength
Description
Length of the transferred data.
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