I would like to interface SimpleBGC board with another STM32-based board to send and receive Serial API commands. It would be great to use 2nd UART for that, as the first one is used by USB (which I also would like to have for servicing tasks). However it seems not work with any other settings like 115200 8E1 (I need 9600 8N1) and also doesn't work with UART-USB cable converters (I used several to test connection with GUI). The first UART seems not work with 3.3V levels. My questions are:
1. Are there any plans of development 2nd UART? Another settings available would be great.
2. How to configure 2nd UART to have full-duplex communication?
3. Do both UARTs tolerate 5V only?