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The ECSD_LowLevel_ReadBlock function reads a block of data from the SPI bus.
ECSD_ErrorCode ECSD_LowLevel_ReadBlock(
   BYTE *data,
   WORD size
This is the pointer to the buffer where the data should be placed.
The number of bytes to read.
Return value
Returns one of the ECSD error codes (ECSD_STATUS_OK on success).
Called to read a block of data from the SPI bus. 0xFF should be shifted out on the buf while the data is being read. Note: You should never call this function directly. The API documentation is present to allow you to write your own low level driver optimized for your hardware.