Kinetis Design Studio中的主题 Re: How to debounce switch on PE within KDS

How to debounce switch on PE within KDS

yarannan — Wed, 13 May 2015 22:38:56 GMT

Hi,

1. I am connecting a push button on one gpio pin. I am using high level component on Processor expert. I dont see there is an option that i can enable interrupt on.

->In case someone need the info: In order to add interrupt of GPIO, it has to be added as component of 'ExtInt'.

2. When i hold down switch really long time. The u Controller detect the states back and force (0,1,0,1...). How would i make sure this doesnt happen?

3. How do i set a threshold for a short key press?

So i still dont understand the logic of debounce below. My current thought would be capture the duration of interrupt, and compare it to a threshold time. However,

i am not confident about this idea.

Thanks,

Yaran

Message was edited by: Yaran Nan

Re: How to debounce switch on PE within KDS

Alice_Yang — Thu, 14 May 2015 01:53:25 GMT

Hello Yaran,

Please provide the information bellow :

1) The version of your KDS;

2) Which chip;

3) Which gpio component of PE, please screenhort ,thank !

Alice

Re: How to debounce switch on PE within KDS

BlackNight — Thu, 14 May 2015 04:25:06 GMT

Hi Yaran,

if you are not using the Kinetis SDK, then there is an open source component which does all the button press handling, with/without interrupts and configurable debouncing (short/long keypress). This project is using it: JoyStick Shield with the FRDM Board | MCU on Eclipse

Erich

Re: How to debounce switch on PE within KDS

yarannan — Thu, 14 May 2015 13:13:51 GMT

Hi Alice,

1) KDS 2.0 haven't update yet

2) MK20DX256VLL10

3) I used BitIO (PTE4) and Init_GPIO component

Thank you.

Yaran

Re: How to debounce switch on PE within KDS

yarannan — Thu, 14 May 2015 13:16:13 GMT

Hi Erich,

Thanks for the attention. I am running on KDS. I didnt see some IRQ option on KDS though. The current biggest issue is that I don't

know how to enable and disable gpio interrupt by using PE template. Please let me know if there is more resources available.

Thanks,

Yaran

Re: How to debounce switch on PE within KDS

yarannan — Thu, 14 May 2015 13:47:56 GMT

Hello Erich,

I figured out how to disable and enable interrupt on KDS now. Thanks for the link above.

Thanks,

Yaran