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Why does the standard code provided for input capture mode of K66 doesn't work out of the box?

Question asked by Samer Afach on Oct 6, 2017
Latest reply on Oct 10, 2017 by Samer Afach

This nice document: https://cache.nxp.com/docs/en/application-note/AN5142.pdf 

provides many code examples on how to program K66 chips with FTM. On my Teensy 3.6 (which uses K66), the code for "Phase-shift PWM signal" from section 3.4 works perfectly well. However, the code from "Single-edge capture mode" in section 3.8 doesn't work. Both use FTM0, and both should be using the same ports. For capture mode, I expect to input a signal at FTM0_CH0, and then get the interrupt triggered to modify the value of diff. But I noticed that the interrupt is never called.

 

What am I missing? Please assist.

 

Thank you.

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