topic How to count and control the switch press. in Kinetis Microcontrollers

How to count and control the switch press.

SBK_SBK_SBK_SBK — Fri, 05 May 2023 03:26:05 GMT

if (adcResultInMv >4125)
{
GPIOA_PSOR |= 1<<PTA3 | 1<<PTA2;
GPIOA_PCOR |= 1<<PTB5;
if (GPIOA_PDIR & (1<<PTA1)) {
GPIOA_PSOR |= 1<<PTB5;
}
else {
GPIOA_PCOR |= 1<<PTB5;
}
}

In the above code, i want to count the switch press event and based on the number of switch pressed (if switch pressed >5 ) permanently turn off the Red LED.

Can anyone one help me to figure out this issue.

Re: How to count and control the switch press.

bobpaddock — Fri, 05 May 2023 12:51:25 GMT

It is probably not (|=) OR that you want, rather just assignment (=).. The NXP examples are full of these bad examples. They end up clearing bits that you did not mean to clear.

Not clear how the ADC is involved here? If more than five switches are pressed turn off the LED?

Switches are not ideal devices. Unless debouced one press can look like many presses. That is detailed here along with code to debounce them:

http://www.ganssle.com/debouncing.htm

Re: How to count and control the switch press.

SBK_SBK_SBK_SBK — Mon, 08 May 2023 03:07:42 GMT

Thanks for your reply.
Surely, i will go through it.