Format  Sint32 CDC_CdOpen (void)
 Input  None
 Output  None
 Function value  Returns an error code.
 Function  Stops the CD drive and opens the tray.
. -Automatic type (front loading): The CD block automatically opens the tray.
. -Manual type (top loading): 〈BUSY〉 state until manually opened.
 Remarks  When the tray is opened, the TOC / session information and file information are initialized and an interrupt is required.
  The cause register's DCHG and EFLS flags are set to 1. (Same when manually opened)
  Refer to “5.5 Block Initialization” for details. 

 Format  Sint32 CDC_DataReady (Sint32 dtype)
 Input  dtype: Waiting for transfer preparation type
 Output  None
 Function value  Returns an error code.
 Function  Wait until data transfer is ready. Data can be transferred after preparation is complete.
  After transferring the data, it is necessary to execute the end of data transfer (CDC_DataEnd). 

  (1) Transfer ready type  

constant name	description
CDC_DRDY_GET	Specify when retrieving data. (CD block to host)
CDC_DRDY_PUT	Specify when writing data. (Host → CD block)

  (2) Processing contents waiting for transfer preparation  

待 ち Wait until the DRDY flag in the interrupt factor register becomes 1, and when it becomes 1, clear it to 0.
When writing, if the empty sector cannot be secured, the EHST flag in the interrupt factor register will be set to 1.
The In that case, a CDC_ERR_PUT error is returned. 

 Remarks  If there is an error waiting for preparation, there is no need to execute data transfer termination. Inside this function
  Automatically executed.