Arduino for STM32

...PS. I forgot to say, but I tested with an Arduino Uno, and the serial reading at 300 baud read works fine!

Hi,

I'm struggling to read an old sensor with uses a 300 baud rate serial communication with STM32.

Apparently, I need to change the RCC_PRESCALER_APB2 to read this low baud rate. However, I tried Serial2 and Serial3, tried APB2 and APB1 with different clock divisions (1 to 16X), and I couldn't ...