topic MCF52233DEMO Inputs in ColdFire/68K Microcontrollers and Processors

MCF52233DEMO Inputs

w2vy — Thu, 29 Oct 2020 09:18:49 GMT

This is so silly it is nuts.

I want to use the GPT0 as an input (which is the Default) and I can't seem to get it working.

Here is some code that *should* echo the state of GPT0-3 on TIN0-3 (w/LEDs on the DEMO board)

Code:

#include <stdio.h>#include "common.h"#include "m52233DEMO.h"int main() {    MCF_GPIO_DDRTA = 0; // Inputs    MCF_GPIO_PTAPAR = 0; // GPIO Pins    MCF_GPIO_PTCPAR = 0; // GPIO Pins    MCF_GPIO_DDRTC = 0x0F; // Outputs    MCF_GPIO_PORTTC = 0; // Turn LEDs off    while (1) {        uint8 ta, tc;        ta = MCF_GPIO_PORTTA;        tc = 0;        if (ta&1) tc |= 1;        if (ta&2) tc |= 2;        if (ta&4) tc |= 4;        if (ta&8) tc |= 8;        MCF_GPIO_PORTTC = tc;    }}

Re: MCF52233DEMO Inputs

mjbcswitzerland — Wed, 05 Dec 2007 07:41:30 GMT

Hi w2vy

To read the port input state use the SETTA register rather than the PORTTA register.
Reading PORTTA returns the current state of the register and not the current pin state.

Regards

Mark Butcher

www.uTasker.com

Re: MCF52233DEMO Inputs

w2vy — Wed, 05 Dec 2007 23:19:35 GMT

That was it... Thanks
(I knew it was stupid!)