topic Re: Init_GPIO in Kinetis Design Studio

Init_GPIO

arnaldogomes — Thu, 28 Apr 2016 19:34:59 GMT

Hi guys!

Using "Init_GPIO" it is possible to set pull-up or pull-down resistor in KDS V3.0.0?

Regards

Re: Init_GPIO

BlackNight — Thu, 28 Apr 2016 19:42:16 GMT

Hi Arnaldo,

yes, see below:

Erich

Re: Init_GPIO

arnaldogomes — Thu, 28 Apr 2016 22:49:02 GMT

Hi Erich!

Thank you for your time.

I tried to build a simple example with FRDM-KL25Z board. But when I set "Init_GPIO" (see bellow) exist just three options (Pin direction, Output value and Pull resistor).

Probably I made some mistake. How do I have other options?

Could you help me?

Regards,

Arnaldo

Re: Init_GPIO

BlackNight — Fri, 29 Apr 2016 06:58:00 GMT

Hi Arnaldo,

the KL25Z only has pull-ups available in the hardware, so you don't have a choice to select pull-up or pull-down.

Erich

Re: Init_GPIO

arnaldogomes — Fri, 29 Apr 2016 11:12:09 GMT

Hello Erich!

In other post (https://community.freescale.com/thread/327975) you indicated this link: https://mcuoneclipse.com/2012/11/12/tutorial-bits-and-pins-with-kinetis/

The author used CodeWarrior 10.3 according to my understanding of the post, is possible to configure pull-up or pull-down. The topic 11.5.1 in KL25Z Reference Manual we have PS (Pull Select) registry responsible for setting.

Knowing that the processor is the same I don't understand because in CodeWarrior has this option (Pull Select) and in the KDS don't have!

Regards,

Arnaldo

Re: Init_GPIO

TICS_Fiona — Tue, 03 May 2016 11:22:27 GMT

Hi Arnaldo

I checked in latest CodeWarrior version v10.6.6, it does not support “Pull Selection” either.

Pin Control Register contains the bit PS(Pull Select), however, this bit is read only for pins that do not support a configurable pull resistor direction. Please see the description for PORTx_PCRn in Reference Manual.

KL25 has pull-enable control, but only to enable pull-ups (pull-down for PTA0). Pull select is not available at any port. Please also open KL25 Reference Manual, go to the Chip Configuration Chapter->Human Machine Interfaces->GPIO configuration->Port control and interrupt summary Section.

Best Regards

Fiona Kuang

TIC - Technical Information Center

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Re: Init_GPIO

arnaldogomes — Tue, 03 May 2016 12:26:55 GMT

Hello Xin!

Thanks

Regards,

Arnaldo