Protocol Frame Description

CUSTOM_SYSTEM_SLEEP Command

Table 5-57 .CUSTOM_GET_SYS_VERSION command

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

If not used,

94h

00h

No

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

Player response is CUSTOM_SYS_VERSION* frame.

Ask the Player to enter in power down mode (keep audio capacitors charged).

Note: To avoid any extra-power consumption in power down mode because of keeping audio capacitors charged, refer to SYSTEM_POWER_DOWN command.

Table 5-58 .CUSTOM_SYSTEM_SLEEP command

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

If not used,

95h

00h

No

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

CUSTOM_VOLUME Set volume for DAC master playback gain (analog volume).

This command is the same as the AUDIO_SET_GAIN (DAC Master Gain 04h).

Table 5-59 .CUSTOM_VOLUME command

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

If not used,

F0h

01h

Byte 0: Gain Value

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

Note: Refer to AUDIO_SET_GAIN command description for Gain Value.

CUSTOM_GETTOTALTIME Command

Player response is SYSTEM_ACK or SYSTEM_NACK.

Get MP3 file total play time.

Note: The player response is only right whend MP3 file is Constant bit rate MP3. Table 5-60 .CUSTOM_GETTOTALTIME Command

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

If not used,

F1h

00h

No

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

Player response is CUSTOM_TOTALTIME* frame.

CUSTOM_PLAYER_LAST Go to the last file of current directory .

Command

5-48

AT83SND2CMP3 User Guide

7525A–MP3–07/05