I'm using STM32CubeMX 5.2.0MCU: STM32L053R8TxFirmware: STM32Cube FW_L0 V1.11.2Toolchain/IDE: MDK-ARM V5Tested with 3 different boards, even with a default code (as generated by CubeMX) in debug mode, and also with a simple UART transmitter program (t...