topic Rotary encoder and MIMXRT1020 in i.MX RT Crossover MCUs

Rotary encoder and MIMXRT1020

Irv95G — Mon, 28 Jun 2021 08:06:21 GMT

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

Re: Rotary encoder and MIMXRT1020

ErichStyger — Mon, 28 Jun 2021 08:44:35 GMT

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

Re: Rotary encoder and MIMXRT1020

Irv95G — Tue, 29 Jun 2021 07:03:21 GMT

Thanks for the information ErichS

Re: Rotary encoder and MIMXRT1020

jingpan — Tue, 29 Jun 2021 07:13:27 GMT

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

Re: Rotary encoder and MIMXRT1020

FormalMeerkat — Wed, 30 Jun 2021 09:21:51 GMT

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

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