AN3997

Application overview

Doc ID 022390 Rev 1

7/15

Figure 3.

Audio playback/record firmware driver flowchart

1.

If internal Flash is selected as mass storage media, pressing the user button has no effect.

2.3

Audio playback application

The flowchart in Figure 4 describes the playback application. It implements several control

features like Pause/Resume, Repeat On/Repeat Off.

The MEMS accelerometer is used to support Pause/Resume. When the wave player is

running, the first click on the board stops playing and the second click on it resume playing.

The Repeat On/Repeat Off feature is managed with DEFINEs in the main.h file.

MS19888V1

Choose the mass media storage (note 1)

User button

pressed?

Audio playback feature

initialisation:

green LED On

Play wave from the

selected media storage:

blue LED blinking

End of playback

application:

green LED blinking

Audio record feature

initialisation:

green LED On

Record wave in the

selected media storage:

orange LED blinking

End of recording

application:

green LED blinking

User button

pressed?

User button

pressed?

Green LED blinking

Yes

No

Yes

No

No

Yes