teensy 3.5 port mapping

[jacko91]

Good day,

I am fairly new to the teensy. So I tried the port mapping from

https://forum.pjrc.com/threads/34808-K66-Beta-Test?p=106291&viewfull=1#post106291

I hooked pin 26 to 3.3V.
As pin 26 should be bit 14 from Port A I then used:
Serial.println(GPIOA_PDIR,BIN);
But I only get 0 as output.

Any ideas?

Thanks

 

[manitou]

The forum rule (at the top) says
Always post complete source code & details to reproduce any issue!

so we can't tell if you did pinMode(26,INPUT);

you have to set pinMode() before reading/writing digital pin (unlike Arduino AVR's). Without the pinMode() the PDIR value will be 0

Why not digitalRead(26); ??

 

[PaulStoffregen]

Any ideas?

Normally the expectation is posting a complete program (eg, the "Forum Rule"), so we can see what you really did. This saves a lot of time and lets us help you much better.

So, without that, I'm going to blind guess that perhaps the pin was never configured? The pins default to a low power disabled state, so if you never call pinMode() or write their config registers, you can expect them to do nothing.

 

[jacko91]

Thank you guys very much and sorry for the missing code.
And yes the pinMode solved the problem.
Thanks for the quick and great support.

Greetings