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Flyron Technology Co., Ltd. 20 Channel MP3 Sound Board
4.4. Returned Data from Module
4.4.1 Returned data after the module is powered on
1) After the module is powered on, normally it needs about no more than 500ms to 1500m s (depending on the actual track
quantities in the storage device) initialization time. Once the initialization is done, the module returns a data to MCU. If it
does not return a data after more than the initialization time, it means there is an error for initialization, and please che ck
the hardware connections.
2) The returned data from module after initialization means the current effective s to rage device /online equipment. For
example, the module returns 7 E FF 06 3 F 00 00 03 xx xx EF. 0x3F is the returned command by module, and 0x03
represents USB flash and SD card are effective online at the sametime. See the details as below.
Online Equipment Re turned Da ta
7E FF 06 3 F 00 00 01 xx xx EF
7E FF 06 3F 00 00 02 xx xx EF
7E FF 06 3F 00 00 04 xx xx EF
USB flash and SD card online
7E FF 06 3F 00 00 03 xx xx EF
3) MCU cannot send commands to control the module until the initialization of the module is done and a data is returned,
otherwise the commands sent by MCU will be ignored and also this will effect initializing of the module.
4.4.2 Returned data after a track is finished playing
1st track is finished playing in US B flash
7E FF 06 3C 00 00 01 xx xx EF
2nd track is finished playing in U SB flash
7E FF 06 3C 00 00 02 xx xx EF
1st track is finished playing in SD card
7E FF 06 3D 00 00 01 xx EF
2nd track is finished playing in SD card
7E FF 06 3D 00 00 02 xx xx EF
1) There is a returned data after a track is finished playing. For example, the returned data is 7E FF 06 3C 00 00 01 xx xx EF.
0x3C represents USB flash and 0x3D represents SD card. 0x00 and 0 x01 represents the 1st track. 0x01 and 0xF4 represents
the 500th track (0x01F4=500).
2) Because all of the files (tracks) in the storage device are read in physical sequence, the returned data still follow the physical
sequence, which needs to be noted.
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