How to read from Grounded switch

jonathan_abbati — Tue, 31 May 2011 00:58:12 GMT

Hello Friends!

I am working on the EVALH1 board which has some switches integrated onto Port T which I would like to utilize, but they are all hooked to ground without a power sourer running to them. I have tried playing with the playing with the data direction of the ports and supply them with power, but I am left with a very dim light due to my looping. Here is the code I am using, I have a feeling that I am simply overlooking something very small within the various of this following code:

void main(void) {

DDRH = 0xFF; // LEDs

DDRT = 0xFF; // Switches
PTT = 0xFF;

while(1)

{

DDRT = 0xFF;

PTT = 0xFF;

DDRT = 0x00;

    if (PTIT_PTIT6 == 1)
        PTH_PTH1 = 1;

    if (PTIT_PTIT6 == 0)
        PTH_PTH1=0;

}

The main question I have would be: how do I read from these switches if they are connected to ground?

Thank you so much for your time and I greatly appreciate anything you may be able to share with me!

Sincerely,

Jonathan

Re: How to read from Grounded switch

mculater — Thu, 30 Jun 2011 01:23:56 GMT

Enable the internal pullup resistors for PORTT via the PERT register.

Best regards,

Carl Barnes

www.technologicalarts.com

AMPS: Adapt Modular Prototyping System for Microcontrollers

Since 1995

EVALUATE * EDUCATE * EMBED

S12 / MagniV MicrocontrollersのトピックRe: How to read from Grounded switch

How to read from Grounded switch

Re: How to read from Grounded switch