Teensy 3.6 Fast pinMode alternative?

[Utak]

Hi, I can switch the complete ports with GPIOE_PDOR and GPIOE_PDIR very fast (High/Low ~7ns)

I was searching here in this forum for an also fast pinMode alternative, but I found nothing.
My question: I want to switch a whole port from Input to Output. Is this possible?

I've tried GPIOE_PDDR, but this is not working

"pinMode" alone takes ~200ns ... and this is very slow.

 

[Utak]

I found the solution by myself.

You have to use pinMode(x, INPUT) and then you can manipulate the Port with GPIOE_PDDR very fast. Without pinMode before its not working!

 

[Frank B]

This is the code for Teensy 3.x pinMode(): https://github.com/PaulStoffregen/cores/blob/master/teensy3/pins_teensy.c#L1090

Maybe it is somehow useful.

 

[Chris O.]

fast pinMode alternative

Use Global Pin Control Low Register (PORTx_GPCLR) :https://forum.pjrc.com/threads/64970-Teensy-3-x-Global-Pin-Control-(Low-High)-Register-PORTx_GPCLR-PORTx_GPCHR-How-to