Data Sheet
Shenzhen Waytronic Electronics Co., Ltd. WT2003S-16S Chip
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3.4.3.11. Previous command(AD)
Start code
Length
Command
Check code
End code
7E
03
AD
B0
EF
This command can trigger to play the previous music. When playing the first music, sending this
command will trigger to play the last music.
3.4.3.12. Volume control command(AE)
There are 32 volume levels in total, from 00 to 31(00~1F). 00 is mute; 31 is full volume.
Start code
Length
Command
Volume level
Check code
End code
7E
04
AE
1F
XX
EF
It sends the maximum volume 31 level in this example. It is available to adjust volume in real time.
3.4.3.13. Specified play mode (AF)
Start code
Length
Command
Parameter
Check code
End code
7E
04
AF
00: Single play, no loop playback
(default)
B3
EF
01:Single loop play mode
B4
02:All audio loop play mode
B5
03:Random play mode
B6
Note: this command modifies the playing mode in the condition of no power down. After power down it
will restore the default mode. When using this command, just setting MCU once in the module
initialization can realize to execute according to the settings with power on each time.
3.4.3.14. Combination Play Command (B0)
This command can specify to continue playing some files in current directory. This command is only
used for index play.
Start Code
Length
Command
Mark Word
Check Code
End Code
7E
04
B0
01
XX
EF
Start
Code
Length
Command
High order of
audio
Low order of
audio
Check
Code
End
Code
7E
05
B0
00
01
XX
EF
Start Code
Length
Command
Mark Word
Check Code
End Code
7E
04
B0
FF
XX
EF