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MSP430FR5994: Behavior of BOOSTXL-AUDIO with FIR

Part Number: MSP430FR5994
Other Parts Discussed in Thread: BOOSTXL-AUDIO,

Hello,

Let me ask about behavior of audio output when user use "BOOSTXL-AUDIO_430BOOST-SHARP96_FFT_FIR_LEA_MSP430FR5994"

According to following user's guide, user can use FIR mode without LCD.

http://www.tij.co.jp/jp/lit/ug/tidubi9b/tidubi9b.pdf

Then, I'm tring to perform "FIR-Filtering" mode by pushing S1 switch.

When FFT mode, I could see following expected waveform at "input of OPAMP(ch2)" and "output of OPAMP(ch1)".

However, when I change to "FIR filtering", output is disappeared and I could hear any sound from both microphone and speaker.

If you have any procedure except written in above user's guide,  Could you please let us know ?

Best Regards,

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