Start an asynchronous interrupt transfer .

int32_t UsbInterruptXferAsynch( 
    int32_t udev, 
    uint32_t pipe, 
    void *data, 
    int32_t len, 
    uint32_t flags,
    uint32_t interval, 

    uint32_t timeout, 
    RTHANDLE mbx, 
    void (*cb_func)(), 
    void * cb_data 
);

Parameters

udev

Device handle from UsbOpenDevice.

pipe

Value describing the device, endpoint number, type, and transfer direction.

data

User data buffer.

len

Length in bytes of expected transfer.

flags

Transfer flags. One of the following:
USB_FORCE_SHORT_XFER - force a short transmit last
USB_SHORT_XFER_OK - allow short reads
USB_DELAY_STATUS_STAGE - insert delay before STATUS
USB_MULTI_SHORT_OK - allow multiple short frames

interval

The interval described in the interrupt endpoint descriptor.

timeout

Timeout in milliseconds for the transfer.

mbx

Mailbox handle created by the user. The user must wait on this mailbox and expect a structure of type UsbAsynchNotifyArgs. The user may then call UsbAsynchNotifyArgs.cb_func() and pass any arguments they define. Usually cb_data is the preferred parameter.

cb_func

Pointer to a user-defined callback function.

cb_data

User-defined callback data pointer, passed to callback function.

Return Values

USB_ERR_NORMAL_COMPLETION	Success. The asynchronous operation was started.
USB_ERR_NO_STACK	The USB stack was not ready.
USB_ERR_INVAL	The pipe or flags parameter was not valid.
USB_ERR_TIMEOUT	The device did not respond within the timeout interval specified.
USB_ERR_NO_DEVICE	The hdev parameter does not correspond to a valid device.
USB_ERR_FAULT	A fault occured during the data transfer.
USB_ERR_SHORT_XFER	The device did not transfer the requested number of bytes of data.
USB_ERR_STALLED	The device stalled and the endpoint halted while trying to complete the operation.

Requirements