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CCS/TMS320F28379D: ECAP prescaler for 2KHz signal measurement

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Part Number: TMS320F28379D

Tool/software: Code Composer Studio

I want to read signal of rotating shaft which gives frequency from 20Hz to 1.73Khz.

I have initialized GPIO 16 pin as eCAP. I am reading signal but in between eCAP  is reading noise.

I am using two DCDC conveters in my circuit to supply +/- 12 V. I have feeling that because of high switching frequency in DCDC converter causing noise reading in eCAP.

I have doubt that eCAP frequency is 200MHz and shaft  frequency is less than 2KHz.

Shall i use prescaler for eCAP so that it will not read signal frequency above 2KHz.

If this works then how to use eCAP prescaler in program ?


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