SDReadWriteRegistersDirect (Windows CE 5.0)

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This function reads from or writes to the registers of an SDIO card.

SD_API_STATUS SDReadWriteRegistersDirect(SD_DEVICE_HANDLEhDevice,
  SD_IO_TRANSFER_TYPEReadWrite,
  UCHARFunction,
  DWORDAddress,
  BOOLEANReadAfterWrite,
  PUCHARpBuffer,
  ULONGBufferLength);

Parameters

• hDevice
  [in] Handle to an SD bus device.
• ReadWrite
  [in] Value that indicates whether to read from or write to the registers of an SDIO card. A value of SD_IO_READ indicates a read operation. A value of SD_IO_WRITE indicates a write operation.
• Function
  [in] Function number.
• Address
  [in] Starting register address for the read or write operation.
• ReadAfterWrite
  [in] Value that indicates whether to perform a read operation following a write operation. If set to TRUE, a read is performed following a write operation. The read data is returned in pBuffer.
• pBuffer
  [in, out] Buffer to hold register data.
• BufferLength
  [in] Number of bytes to read or write.

Return Values

A return value of type SD_API_STATUS indicates success or failure.

Remarks

Direct I/O is intended for simple register access and requires a significant amount of overhead for each byte transferred. The preferred method for transferring large amounts of data is through the extended I/O command.

Requirements

OS Versions: Windows CE 5.0 and later.
Header: Sdcardddk.h.
Link Library: Sdcardlib.lib.

See Also

Secure Digital Card Driver Functions

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