Encoder Interface ABZ's filter

[chenyunhua]

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!

[danielmartynek · Accepted solution]

Hello @chenyunhua,

There is a configurable digital filter:

Also discussed here:

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

Regards,

Daniel

[chenyunhua]

Thanks very much for your information!

Best Regards!