Resolved! And again: Incorrect handled UART overrun error in stm32f4xx_hal_uart.c
I have to design a special USB <-> RS485 converter using an STM32F401.I realized the project at first with a STM32F4071G eval board with DMA supported USART functions and without RTOS using STM32Cube with FW-F4_V1.25.1 and all worked fine.After porti...