Rotary encoder and MIMXRT1020

[Irv95G]

Hi, im new to embeded systmes, im trying to interface a mechanical rotary encoder with the MIMXRT 1020 EVK,  can anyone tell me if there are speciphic module/peripherals to do this ? i'm currently trying with interrups pins.

thanks 

[jingpan]

Hi @Irv95G ,

RT1020 has QTMR and ENC. QTMR can deal with quadrature mode and increase/decrease mode. ENC is enhanced quadrature encoder/decoder module.

Regards,

Jing 

[ErichStyger · Accepted solution]

It depends on your usage and the frequency of your rotary encoder: Because mechanical, you will need to debounce the signals imho. And the signal frequency is probably so low that using interrupts does not make much sense. What I use for such things are normal GPIO pins (polled) with a debounce state machine. That has the advantage that you don't need precious interrupts and you don't run into a 'death-by-interrupt' situation.

I hope this helps,

Erich

[FormalMeerkat]

Thank you for such a wonderful post and sharing. God bless you.! 

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[Irv95G]

Thanks for the information ErichS