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Communication Protocol
3-20 AT83SND2CMP3 User Guide
7525A–MP3–07/05
Example 1 Figure 3-6 . Transfer a File From Remote Controller to Player Selected Memory
During the file write transfer, after the FS_FCREATE command, no other commands
than FS_FWRITE_BLOCK, FS_FWRITE_LAST_BLOCKor FS_FCLOSE are allowed to
finish the file transfer because the AT83SND2CMP3 is an optimized transfer mode.
To create the file “wr_test.mp3” (total size 1312 Bytes: 2 block of 512 bytes + last block
288 bytes):
Send FS_FCREATE ( 3 blocks, ‘w’ ‘r’ ‘_’ ‘t’ ‘e’ ‘s’ ‘t’ ‘.’ ‘m’ ‘p’ ‘3’ ‘\0’)
Wait for response SYSTEM_ACK* frame.
Send FS_FWRITE_BLOCK + 1st block of data (512 bytes),
Wait for response SYSTEM_ACK* frame.
Send FS_FWRITE_BLOCK + 2nd block of data (512 bytes)
Wait for response SYSTEM_ACK* frame.
send FS_FWRITE_LASTBLOCK ( 288 bytes ) + last block of data (288 bytes)
Wait for response SYSTEM_ACK* frame. The file is now created.
Note: If Player response is SYSTEM_NACK to any command during this procedure, the Player
will return into the IDLE state and the file creation procedure will be aborted.
Controller Player
Transfering A File
From Rem ote
C o n tro ller to P layer
F
S
_
F
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R
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A
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(
N
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Player creates the
file on selected
memory (in root dir).
Now waiting for data.
Player programms
now the memory and
prepare Now waiting
for data.
F
S
_
F
W
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_
L
A
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+
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+
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S
Player programs the
last block of data.
File is closed. No
need to send the
FS_FCLOSE frame.