STM32F4xx Communication via RX/TX

[digidiver11]

Hi @terjeio, i downloaded the "blackpill_map.h" file but i can't find the RX/TX pins.

Which pins are used for communication via RX/TX. In the future I would like to address my CNC machines not via USB but only via an optically separated interface, because many motor drivers cause strong interferences also during the transmission.

I myself use an optically separated current loop which manages very high data transfers (up to 10MBit).

Thanks for your great work

[terjeio]

Serial port pins are typically defined in serial.c (or similarly named file). This is due to most MCUs restricting which pins can be used for which UART. You may also use the $pins command to output the pin mapping, but be aware that additional UART ports will not be assigned unless needed, e.g. for Modbus or Trinamic UART mode stepper drivers.