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Communication Protocol
AT83SND2CMP3 User Guide 3-11
7525A–MP3–07/05
Table 3-4 . Custom Command
Table 3-5 . Player Response (*)
FS_FCREATE 66h Yes Create a file on selected memory
FS_FREAD_BLOCK 67h Yes Read data block to current created file
FS_FWRITE_BLOCK 68h No Write data block from selected file
FS_FWRITE_LAST_BLOCK 6Dh No Write last data block from selected file
FS_FCLOSE 69h No Read or write close current file transfer
FS_GETMEMFREESPACE 6Ah No Get memory free space available
FS_GETFILESIZE 6Bh No Get current file size
FS_GETFILEPOS 6Ch No Get current file position
FS_FDELETE 6Eh No Delete current selected File
Protocol Command Command Data Description
Protocol Command Command Data Description
AUDIO_SET_GAIN 91h Yes Set Audio Gain.
AUDIO_SET_PA_LP 92h Yes Set Power Amplifier mode for low power.
CUSTOM_UART_SET_BAUDRATE 93h Yes Change UART baudrate from Remote Controller.
CUSTOM_GET_SYS_VERSION 94h no Get Player version.
CUSTOM_SYSTEM_VOLUME F0h Yes Set Analog Volume (master gain volume)
CUSTOM_PLAYER_GET_TOTAL_
TIME
F1h
Yes Get MP3 file playing total time length.
CUSTOM_PLAYER_FIRST F3h Yes Select first MP3 file in current directory and play it.
CUSTOM_PLAYER_LAST F4h Yes Select last MP3 file in current directory and play it.
Protocol Command Command Data Description
SYSTEM_ACK * 80h 1 Byte General Player acknowledge to Remote Controller’s command.
Data is the current AT83SND2CMP3 Status byte.
SYSTEM_NACK * 81h 1 Byte Player non- acknowledge to Remote Controller’s command.
Data is the current AT83SND2CMP3 Status byte.
FS_NAME * 82h Yes Player current file name.
PLAYER_TIME * 83h 3 Bytes Player current playing time (minute and second since beginning of
the file).
PLAYER_INDEXNUMBER * 86h Yes Number of files in current directory.
PLAYER_VOLUME * 87h Yes Player current analog and digital volume.
FS_FREAD_BLOCK_DATA * 84h Block Send data block to Remote Controller’s command
FS_FREAD_BLOCK.
FS_FREAD_BLOCK_DATA_END * 85h No Player response to FS_FREAD_BLOCK command when end of
file is reached. Player returns then in IDLE state.
FS_MEMFREESPACE * 8Ah Block Free space available on selected memory.
FS_FILESIZE * 8Bh Yes Send current file size.