I have a strange issue with GPIO on Nucleo-64 stm32F401RE.
I implement SPI protocol on it and each line of the GPIO is perform very well.
While I connect a bride to those pins the data line make the EN line noisy. It is like coupling between lines.
I didn't find any technical information about ST GPIO pins, like is it possible to change drive strength?, what is the max current for each GPIO?? etc...
I must solve this issue and I am kind of frustrated since nothing helped... Please advice what can I do to eliminate coupling on this board to work with another device??