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Compiler/CC3235MODASF: AUDBOOST with CC3235MODASF, i2secho example no audio.

Part Number: CC3235MODASF

Tool/software: TI C/C++ Compiler

Hi All

I've connected AUDBOOST on the CC3235MODASF launchpad,  I notice there is no audio echo when I run the i2secho example code.

I confirmed the AUDBOOST is inserted correctly and the TI service pack is flash. Did I miss any step?