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RTOS/TMDSLCDK138: Processing 40khz audio signal with the LCDK Omap L138

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Part Number:TMDSLCDK138

Tool/software: TI-RTOS

Hi.

We bought the OMAP L138 LCDK + the X100 v2 emulator.

We ran the Mcasp Loopback demo, after defining the SAMPLE_RATE to be 96000u,

However, when we insert an input signal which is above 23-24khz nothing comes out.

Below, 23-24 khz - it passes alright.

I'm very afraid that some creative engineer decided to put a low pass filter somewhere at the output. 

Our system processes 40khz signals (ultrasound), so we must have it work.

We need your assistance to make it happen. Is it a code configuration thing, or a hardware filter that we need to disable?


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