topic Re: Why does the standard code provided for input capture mode of K66 doesn't work out of the box? in Kinetis Microcontrollers

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

thequantumphysi — Sat, 07 Oct 2017 01:14:34 GMT

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.

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

Robin_Shen — Tue, 10 Oct 2017 02:54:39 GMT

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

thequantumphysi — Tue, 10 Oct 2017 04:02:45 GMT

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?

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

Robin_Shen — Tue, 10 Oct 2017 06:01:23 GMT

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

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

thequantumphysi — Tue, 10 Oct 2017 08:05:27 GMT

Thanks. I'll research and try this.