PORTC_PCR3 unable to configure as GPIO

[srikanth_vemula]

Hi,

I'm using MK22FX512AVLH12 Micro-Controller.

I'm trying to configure PORTC-pin3 as a GPIO, in the same way, which I followed for other pins. But the register write (PORTC_PCR3) is not happening. The debug mode screenshot of the same is attached herewith.

Please let me know, if any other things to be disabled/enabled. 

Regards,

Srikanth

[mjbcswitzerland · Accepted solution]

Hi Srikanth

I think that you are making a mistake with "|=". Use "=" instead.
"|=" assumes that the register's fields of interest are initially 0, which is not always true. If PORTC_PCR3 defaults to ALT function 4 your code would turn it into ALT function 5, which is not the intention and thus a programing error.

Regards

Mark

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