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AN706-00040-2v0-E
USB-MSC device connection/
disconnection judgement
Timer interrupt(ch.2)(1ms)
Was media disconnected?
Media files
select.jpg
picture1.jpg
picture2.jpg
picture3.jpg
picture4.jpg
picture5.jpg
No
Switch detection module
Yes
JPEG
file
Stop MP3 play
Play/Stop
switch
Close MP3 file
Switch chattering
processing
Selection
previous
switch
Selection
next switch
End file system
music1.mp3
Change to initialization state
music2.mp3
music3.mp3
music4.mp3
music5.mp3
Switch
state
Swith press detection
Was the Play/Stop
switch pressed?
No
Timer interrupt(ch.2)(1ms)
Yes
Touch panel control
driver module
Stop MP3 play
Close MP3 file
Area 1 Area 2 Area 3
Read all JPEG files and display
images for selection on LCD
Area 4 Area 5 Area 6
Change to audio data
playback stop state
Area 7 Area 8 Area 9
Touch panel
state
Touch panel detection
Was touch of
touch panel detected?
No
Yes
No
Stop MP3 play
Close MP3 file
Are there enough empty
area in the input buffer?
Yes
Read all JPEG files and display
images for selection on LCD
Read MP3 data from media
and copy in the input buffer
Change to audio data
playback stop state
One frame of the data in the
input buffer is decoded, then
store it to the RAW buffer
DMA interrupt(ch.2)
Sampling data
output module
PCM
data
I2S
output
No
Was one frame
decoded successful?
Output
buffer
Yes
Up-sample the RAW buffer data
and copy it to the output buffer
PCM
data
Figure 49 Application Operation Flow (Audio Playback Status, Case of MP3)
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