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LPGET_ISOCH_RESULTS (Compact 2013)

3/26/2014

This function gets the status of an active isochronous transfer.

Syntax

typedef BOOL (* LPGET_ISOCH_RESULTS)(
  USB_TRANSFER hTransfer,
  DWORD cFrames,
  LPDWORD lpdwBytesTransferred,
  LPDWORD lpdwErrors
);

Parameters

  • hTransfer
    [in] Handle to an isochronous transfer.
  • cFrames
    [in] Number of frames to return.
  • lpdwBytesTransferred
    [out] Pointer to an array of lengths. This pointer might be NULL, in which case this function does not report bytes-transferred information.
  • lpdwErrors
    [out] Pointer to an array of error values. This pointer might be NULL, in which case this function does not report error value information.

    The following table shows the possible error codes for UHCI.

    Error code

    Value

    USB_NO_ERROR

    0x00000000

    USB_STALL_ERROR

    0x00000004

    USB_NOT_COMPLETE_ERROR

    0x00000103

    For OHCI, the hardware writes the error status into the buffer. The following table shows the possible error codes for OHCI.

    Error code

    Value

    USB_NO_ERROR

    0x00000000

    USB_CRC_ERROR

    0x00000001

    USB_BIT_STUFFING_ERROR

    0x00000002

    USB_DATA_TOGGLE_MISMATCH_ERROR

    0x00000003

    USB_STALL_ERROR

    0x00000004

    USB_DEVICE_NOT_RESPONDING_ERROR

    0x00000005

    USB_PID_CHECK_FAILURE_ERROR

    0x00000006

    USB_UNEXPECTED_PID_ERROR

    0x00000007

    USB_DATA_OVERRUN_ERROR

    0x00000008

    USB_DATA_UNDERRUN_ERROR

    0x00000009

    USB_BUFFER_OVERRUN_ERROR

    0x0000000C

    USB_BUFFER_UNDERRUN_ERROR

    0x0000000D

    USB_NOT_ACCESSED_ERROR

    Ee485433.note(en-us,WinEmbedded.80).gifNote:
    HCD maps USB_NOT_ACCESSED_ALT to USB_NOT_ACCESSED_ERROR.

    0x0000000E

Return Value

Returns TRUE if hTransfer points to a completed isochronous transfer. Otherwise, returns FALSE.

Remarks

The supplied arrays are filled out with the error values and amounts of data transferred for each frame. There might have been data transferred on a frame, even if lpdwErrors containserrors.

Requirements

Header

usbdi.h

See Also

Reference

USB Driver Functions