harmony 鸿蒙usb_ddk_api.h
usb_ddk_api.h
Overview
Declares the USB DDK APIs used by the USB host to access USB devices.
Since
10
Related Modules
Summary
Functions
| Name | Description |
|---|---|
| OH_Usb_Init (void) | Initializes the DDK. |
| OH_Usb_Release (void) | Releases the USB DDK. |
| OH_Usb_ReleaseResource (void) | Releases the USB DDK. |
| OH_Usb_GetDeviceDescriptor (uint64_t deviceId, struct UsbDeviceDescriptor *desc) | Obtains the device descriptor. |
| OH_Usb_GetConfigDescriptor (uint64_t deviceId, uint8_t configIndex, struct UsbDdkConfigDescriptor **const config) | Obtains the configuration descriptor. To avoid memory leakage, use OH_Usb_FreeConfigDescriptor() to release a descriptor after use. |
| OH_Usb_FreeConfigDescriptor (const struct UsbDdkConfigDescriptor *const config) | Releases the configuration descriptor. To avoid memory leakage, release a descriptor after use. |
| OH_Usb_ClaimInterface (uint64_t deviceId, uint8_t interfaceIndex, uint64_t *interfaceHandle) | Declares a USB interface. |
| OH_Usb_ReleaseInterface (uint64_t interfaceHandle) | Releases a USB interface. |
| OH_Usb_SelectInterfaceSetting (uint64_t interfaceHandle, uint8_t settingIndex) | Activates the alternate setting of a USB interface. |
| OH_Usb_GetCurrentInterfaceSetting (uint64_t interfaceHandle, uint8_t *settingIndex) | Obtains the activated alternate setting of a USB interface. |
| OH_Usb_SendControlReadRequest (uint64_t interfaceHandle, const struct UsbControlRequestSetup *setup, uint32_t timeout, uint8_t *data, uint32_t *dataLen) | Sends a control read transfer request. This API works in a synchronous manner. |
| OH_Usb_SendControlWriteRequest (uint64_t interfaceHandle, const struct UsbControlRequestSetup *setup, uint32_t timeout, const uint8_t *data, uint32_t dataLen) | Sends a control write transfer request. This API works in a synchronous manner. |
| OH_Usb_SendPipeRequest (const struct UsbRequestPipe *pipe, UsbDeviceMemMap *devMmap) | Sends a pipe request. This API works in a synchronous manner. It applies to interrupt transfer and bulk transfer. |
| OH_Usb_SendPipeRequestWithAshmem (const struct UsbRequestPipe *pipe, DDK_Ashmem *ashmem) | Sends a pipe request for the shared memory. This API returns the result synchronously. It applies to interrupt transfer and bulk transfer. |
| OH_Usb_CreateDeviceMemMap (uint64_t deviceId, size_t size, UsbDeviceMemMap **devMmap) | Creates a buffer. To avoid memory leakage, use OH_Usb_DestroyDeviceMemMap() to destroy a buffer after use. |
| OH_Usb_DestroyDeviceMemMap (UsbDeviceMemMap *devMmap) | Destroys a buffer. To avoid resource leakage, destroy a buffer in time after use. |
| OH_Usb_GetDevices (Usb_DeviceArray *devices) | Obtains the USB device ID list. Ensure that the input pointer is valid and the number of devices does not exceed 128. To prevent resource leakage, release the member memory after usage. Besides, make sure that the obtained USB device ID has been filtered by vid in the driver configuration information. |
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