Arduino for STM32

Thank you very much, I figured out, that it was wiring issue, unfortunately combined with chaos with USB programmer which have switched RX/TX pins

I've tested my black pills (F401 and F411) and Serial1 and 2 work without any problems, so it's either wiring issue or bad MCU.

Instead of trying to test it with other stuff that may or may not work, connect Serial1 to Serial2.
HardwareSerial Serial2(PA3, PA2);

void setup() {
pinMode(LED ...

Serial2 is used for the GPS, but for testing the connection, now its conneted to USB programmer (CH340). But the problem seems to be somewhere else, since its not working and printing nothing with anything connected.

Hello,

I am, after a long time on this problem, again desperate and asking for your help..

Im working with Neo n8m GPS with board STM32F411CE and I cannot figure out, how to communicate via Serial2 o pins RX PA3 and TX PA2. If I wont be able to figure this out, I might try to switch to Serial1 ...