Atmel AT83SND2C MP3 - Manual (Page 46)

Protocol Frame Description
5-42 AT83SND2CMP3 User Guide
7525A–MP3–07/05
FS_FWRITE_BLOCK
Command
Write data in current created file (need previous FS_FCREATE command). The number
of FS_WRITE_BLOCK command the Remote Controller shall send to Player is defined
by Number of Blocks Parameter (refer to FS_FCREATE command).
Table 5-44 . FS_FWRITE_BLOCK command
Data are 512 Bytes. Checksum is only for command, not for data (specific to
FS_FWRITE_BLOCK).
The command FS_FWRITE_LAST_BLOCK is used for the last block transfer.
FS_FWRITE_LAST_BLOCK
Command
Write data in current created file (need previous FS_FCREATE command). This com-
mand is used for the last block transfered.
Parameters of FS_FWRITE_BLOCK is the number of byte to finish the file write.
Table 5-45 . FS_FWRITE_BLOCK command
The command FS_FWRITE_LAST_BLOCK is used for the last block transfer.
After the latest FS_FWRITE_LAST_BLOCK command, it is not necessary to send
FS_FCLOSE command as Player will return in IDLE state.
Player response is SYSTEM_ACK*. File is created.
FS_FREAD_BLOCK Command This Command allows Remote Controller to read current selected file in memory.
Table 5-46 . FS_FREAD_BLOCK command
With UART link, data length parameter is equal to 1 block. Data block size is 512 Bytes,
coming after the Player response frame: FS_FREAD_BLOCK_DATA*. Checksum is
only for command, not for data.
Frame Start Channel
Protocol
Command Data Length Data CheckSum Data BLock
7Eh
If not used,
FFh
68h 00h - Yes
Byte 0:1FFh => 512 Bytes
data
(no checksum on data)
Frame Start Channel
Protocol
Command Data Length Data CheckSum Data BLock
7Eh
If not used,
FFh
6Dh 02h
Byte 0: MSB (Number of Bytes to write)
Byte 1: LSB (Number of Bytes to write)
Yes
Byte 0:Xh => X-1 Bytes
data
(no checksum on data)
Frame Start Channel
Protocol
Command Data Length Data CheckSum
7Eh
If not used,
FFh
67h 00h No Yes