I am trying to use the USART's via the CN2 or CN3 connector.The documentation "um2839-discovery-kit-for-iot-node-with-stm32u5-series-stmicroelectronics.pdf" gives the following pin mappings:CN2USART3_TX -> PD8USART3_RX -> PD9CN3USART2_TX -> PA2USART2...