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GetIsochResults

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This function gets the status of an active isochronous transfer.

BOOL GetIsochResults(
  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 may be NULL, in which case this function does not report bytes-transferred information.

  • lpdwErrors
    [out] Pointer to an array of error values. This pointer may 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
    Note   HCD maps USB_NOT_ACCESSED_ALT to USB_NOT_ACCESSED_ERROR.
    		0x0000000E

Return Values

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

Remarks

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

Requirements

OS Versions: Windows CE 2.10 and later.
Header: Usbd.hpp.

See Also

USB Drivers

 Last updated on Tuesday, May 18, 2004

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