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Flyron Technology Co., Ltd. 20 Channel MP3 Sound Board
4.4.3 Returned data of feedback from module
Module returns ACK 7E FF 06 41 00 00 00 xx xx EF
1) In order to enhance stability between data communication, the function of a feedback from module is added. Once there is a
feedback to MCU from the module, it means the module has successfully received the command that MCU sent out. 0x41 is
the returned command by module.
2) Users are free to choose this feedback or not. It‟s also fine not to choose this function.
4.4.4 Returned data of errors
7E FF 06 40 00 00 01 xx xx EF
Module busy (this info is returned when the initialization
is not done)
7E FF 06 40 00 00 02 xx xx EF
Currently sleep mode (supports only specified device in
sleep mode)
7E FF 06 40 00 00 03 xx xx EF
Serial receiving error (a frame has not been received
completely yet)
7E FF 06 40 00 00 04 xx xx EF
7E FF 06 40 00 00 05 xx xx EF
Specified track is out of current track scope
7E FF 06 40 00 00 06 xx xx EF
Specified track is not found
7E FF 06 40 00 00 07 xx xx EF
Inter-cut error (an inter-cut operation only can be done
when a track is being played )
7E FF 06 40 00 00 08 xx xx EF
SD card reading failed (SD card pulled out or damaged)
7E FF 06 40 00 00 0A xx xx EF
When the module is powered on, it reads SD card first and if SD card is not available it goes to USB flash drive.
4.4.5 Returned data after a storage device is plugged in or pull out
7E FF 06 3A 00 00 01 xx xx EF
7E FF 06 3A 00 00 02 xx xx EF
USB cable connected to PC is plugged in
7E FF 06 3A 00 00 04 xx xx EF
7E FF 06 3B 00 00 01 xx xx EF
7E FF 06 3B 00 00 02 xx xx EF
USB cable connected to PC is pulled out
7E FF 06 3B 00 00 04 xx xx EF
0x3A represents a device is plugged in while 0x3B represents a device is pull out. 0x01, 0x02, 0x04 represent
USB flash, SD card and USB cable connected to PC respectively.
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