topic Re: RT1010: Lacking documentation on GPIOMUX in i.MX RT Crossover MCUs

RT1010: Lacking documentation on GPIOMUX

tomula — Wed, 09 Dec 2020 13:11:23 GMT

Hello,

Where I can find more information about GPIOMUX?

If I want to use GPIO_AD_03 as a gpio I will find that one of the muxing options is GPIOMUX_IO17.

But that's it, I can't find any mention of GPIOMUX in the reference manual, how to control it nor how it's mapped to GPIO registers.

Re: RT1010: Lacking documentation on GPIOMUX

mjbcswitzerland — Wed, 09 Dec 2020 15:50:00 GMT

Try this video as starting point:

https://www.youtube.com/watch?v=SmFTi8hlba0

Regards

Mark
[uTasker project developer for Kinetis and i.MX RT]
Contact me by personal message or on the uTasker web site to discuss professional training, solutions to problems or rapid product development requirements

For professionals searching for faster, problem-free Kinetis and i.MX RT 10xx developments the uTasker project holds the key: https://www.utasker.com/iMX/RT1010.html

Re: RT1010: Lacking documentation on GPIOMUX

gusarambula — Thu, 10 Dec 2020 17:20:08 GMT

Hello Tomula,

Additionally, I would recommend looking at the MCUXpresso SDK Examples some of which do cover GPIO. MXUXpresso also has a Pins Config Tool which allow to setup pin muxing with an intuitive GUI.

I would start installing the MCUXpresso IDE and downloading the SDK for the i.MXRT1010.

MCUXpresso IDE (included the Config Tools)
https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools-/mcuxpresso-integrated-development-environment-ide:MCUXpresso-IDE

MXUXpresso SDK Builder

https://mcuxpresso.nxp.com/en/builder

Documentation for the MCUXpresso Config Tools

https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools-/mcuxpresso-config-tools-pins-clocks-peripherals:MCUXpresso-Config-Tools

I hope that this information helps!

Regards,
Gustavo

Re: RT1010: Lacking documentation on GPIOMUX

nickwallis — Thu, 10 Dec 2020 18:10:07 GMT

I agree the implementation of the IOMUX is confusing at first acquaintance, and it's not helped by missing or incomplete documentation.

To start I found it easiest to look at some SDK example projects, I've not used RT1010 but if it's the same as RT106x then you should see calls to IOMUXC_SetPinMux() that sets the pin muxing and IOMUXC_SetPinConfig() that sets the pin config.

Also looking at the contents of fsl_iomuxc.h can be a quick way to see which muxing options are available for a given pin, and you can use the pin function ID's to quickly configure the pin.

-Nick

Re: RT1010: Lacking documentation on GPIOMUX

tomula — Thu, 10 Dec 2020 18:29:23 GMT

Thanks for all the replies, it wasn't an issue of how to do it, I just wanted to know if there is some official documentation about it, to which I can referrer other people.