Emmc_copy
=========

Function description:
---------------------
This demo shows copying files on **EMMC** via **SDIOn**.

Test result:
------------
If the terminal displays the desired print and the file is successfully copied as filename cp.txt, 
the execution is considered successful, otherwise it fails.

IO connection:
--------------
+-----------------+------------------+
| PAD             |    PAD           |
+=================+==================+
| pad_sdion_sdclk |    emmc_clk      |
+-----------------+------------------+
| pad_sdion_sdcmd |    emmc_cmd      |
+-----------------+------------------+
| pad_sdion_sddat0|    emmc_dat0     |
+-----------------+------------------+
| pad_sdion_sddat1|    emmc_dat1     |
+-----------------+------------------+
| pad_sdion_sddat2|    emmc_dat2     |
+-----------------+------------------+
| pad_sdion_sddat3|    emmc_dat3     |
+-----------------+------------------+
| pad_sdion_sddat4|    emmc_dat4     |
+-----------------+------------------+
| pad_sdion_sddat5|    emmc_dat5     |
+-----------------+------------------+
| pad_sdion_sddat6|    emmc_dat6     |
+-----------------+------------------+
| pad_sdion_sddat7|    emmc_dat7     |
+-----------------+------------------+

.. Note::
    * The 'n' in "sdion" indicate the peripheral number.
    * An **EMMC** in FAT32 format should be prepared first.
    * There is a file named fatfs.txt on **EMMC**.