AN726 データシートの表示（PDF） - Silicon Laboratories

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AN726

UTILITY CLASS-D TOOLSTICK USER’S GUIDE

Silicon Laboratories 

AN726

Figure 4. Selecting the USB Utility Class-D ToolStick in Volume Mixer

3.3. Play Prerecorded Flash Mode

In prerecorded flash mode, the Class-D ToolStick will output ~7 seconds of sound from an array saved to flash.

Enter the mode by pressing the MODE button until blue LED DS3 turns on.

Press the PLAY slider button on the board to start the waveform, and press the PLAY slider button again to stop it

before it completes. The blue LED (DS6) will indicate when a play operation is in progress. This mode provides an

alternative sound input source when no sources are available and provides an indication of what sound effects

would sound like.

3.4. Play/Record Flash Mode

The play/record flash mode records compressed sound to the flash of the MCU. Enter the mode by pressing the

MODE button until blue LED DS4 turns on.

Press the REC slider button to start recording, and press the REC slider button again to stop recording. The blue

LED (DS5) will indicate when a record operation is in progress. Multiple recordings will append to the full recording

in flash. Once the flash is full, the MCU will indicate no additional recordings can be made by turning on and

immediately turning off the blue record LED. To record additional sound, press the ERASE slider button to erase

the flash. The blue DS5 LED will turn on while the erase operation is in progress. When recording, the red LED

(DS8) indicates when the microphone input saturates.

Press the PLAY slider button on the board to start the waveform, and press the PLAY slider button again to stop it

before it completes. The blue LED (DS6) will indicate when a play operation is in progress.

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Rev. 0.1

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