Arduino for STM32

Add _ALT1 after PC11 an PC10:
-D PIN_SERIAL4_RX=PC11_ALT1
-D PIN_SERIAL4_TX=PC10_ALT1

And it seems you invert rx and Tx in your definition ;)
Looks strange to have a space after -D. :roll:


Hello fpiSTM ! That did the trick! I worked on this without stop for so long and it was something so ...

Hello All!
I have a custom board that has a LC76G (gps chip) connected to USART 4.
I have verified with my oscilloscope that the LC76G IS sending data... but the RX pin (PC11) isn't recieving anything :(
I have been working non-stop on this for 2 days, and am at my wits end.

I am using Platformio ...