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

[thequantumphysi]

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.

[Robin_Shen]

Hi Samer,

Sorry for the inconvenience! This section may lack the NVIC setting of FTM0.

Please refer the method descripted in '3.1.2.1 Configuring the NVIC' of KQRUG.

Best Regards,

Robin

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[thequantumphysi]

Thank you for your response. Actually I tried adding this before asking the question:

    NVIC_ENABLE_IRQ(IRQ_FTM0);

But it didn't help. Would it be asking too much to provide a minimal working example?

[Robin_Shen]

Please download the SDK_2.2_FRDM-K66Fpackage refer Generating a downloadable MCUXpresso SDK v.2 package.

And then you can find the input_capture example in it's folder. (For example: C:\SDK_2.2_FRDM-K66F\boards\frdmk66f\driver_examples\ftm\input_capture)

Best Regards,

Robin

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[thequantumphysi]

Thanks. I'll research and try this.