Atmel AT83SND2C MP3 - Manual (Page 42)

Protocol Frame Description
5-38 AT83SND2CMP3 User Guide
7525A–MP3–07/05
Player response is PLAYER_TIME* frame.
PLAYER_GETINDEXNUMBER
Command
Get numbers of files in current directory or root directory.
Table 5-32 . PLAYER_GETINDEXNUMBER Command
Player response is PLAYER_INDEXNUMBER* frame.
PLAYER_ENTER_ROOT_DIR
Command
Select first available MP3 files in the root directory. Player response is SYSTEM_ACK or
SYSTEM_NACK frame (no MP3 file found or low level error).
Table 5-33 . PLAYER_ENTER_ROOT_DIR Command
PLAYER_SET_FILTER
Command
Set file filters (no directory, only MP3 files are seen). This command has be sent before
the SYSTEM_SELECT_MEMORY command because the filter are used during file
system FAT install.
Table 5-34 . PLAYER_SET_FILTER Command
PLAYER_GET_FILE_LIST
Command
Get file name list in current directory or root directory.
Table 5-35 . PLAYER_GET_FILE_LIST Command
Player reponse is:
„
FS_NAME* frame for each file name in current directory
„ FS_END_OF_LIST* frame when end of list is reached. First file of the list is then
selected and become current file.
Example:
Frame Start Channel
Protocol
Command Data Length Data CheckSum
7Eh
If not used,
FFh
59h 00h No Yes
Frame Start Channel
Protocol
Command Data Length Data CheckSum
7Eh
If not used,
FFh
5Ah 00h No Yes
Frame Start Channel
Protocol
Command Data Length Data CheckSum
7Eh
If not used,
FFh
5Bh 01h
Byte 0: Filter
- 00h No filter
- 01h Filter directory (no
directory seen only MP3 files)
Yes
Frame Start Channel
Protocol
Command Data Length Data CheckSum
7Eh
If not used,
FFh
5Ch 00h No Yes