Im' working with a STM3f429 dev board and a Mipot 32001353 LoRa module. This module communicates over UART. I have initialized my UART interface with cubeIDE. When i don't connect the wire between TX of module and RX of microcontroller, everything is working fine. I can use a logic analyzer to see the uart communication in both directions. As soon as i connect the TX from module to RX from microcontroller the UART goes crazy. I have no idea why. I already checked all wiring's and power supply and everything looks ok. Does anyone have an idea why this is happening?
EDIT: Problem solved! The RX pin on the MCU was damaged. It was pulled to ground. Using another UART interface on the MCU solved the issue.