Encoder Interface ABZ's filter

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Encoder Interface ABZ's filter

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chenyunhua
Contributor I

Hello,

I am interfacing s32k144 to a encoder with ABZ. AB is connected to FTM quad encoder,

which could config a number of filter length to AB signal. The Z signal is connected to 

GPIO, and using ISR to clear FTM quad encoder counter. The problem is GPIO could

only enable or disable filter, while my situation seems to need a wider filter time.

If anyone encounter the same problem? How to achieve a wider filter for signal Z?

Thanks!

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danielmartynek
NXP TechSupport
NXP TechSupport
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danielmartynek
NXP TechSupport
NXP TechSupport

Hello @chenyunhua,

There is a configurable digital filter:

danielmartynek_0-1669191435114.png

Also discussed here:

https://community.nxp.com/t5/S32-SDK/using-digital-filter-on-external-interrupt-pin-it-overcomes-on/...

 

Regards,

Daniel

 

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chenyunhua
Contributor I

Thanks very much for your information!

Best Regards!

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