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About Signal Measurement Mode

Question asked by David Gao on Jan 14, 2019
Latest reply on Jan 17, 2019 by Razvan-nicolae Tilimpea

Hi, Dear

I need some help about Signal Measurement Mode, a lot of thanks in advance.

 

I have a 3-wire fan, so far as I know, I should be able to read speed signal from the 3rd line.

And, the FTM input capture seems just meet my need, and I manged to get stable speed by running example project named 'ftm_signal_measurement_s32k144'.

 

But, when I choose another channel, some error hint pops up, just as marked in the image below. (It says, only even channels can be configured in Signal Measurement Mode)

According to circuit diagram design, I must use PIN29 (PTC_15)

 

So

1. Did I choose a wrong approach? (Should't I choose input capture?)

2. How can I solve this problem?

3. And, why there is such restriction?

 

A lot lot lot thanks

 

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