Resolved! Minor error in CMSIS-mandated device headers (yes, in Cube)
Posted on April 26, 2017 at 12:22[STM32Cube_FW_F4_V1.15.0]\Drivers\CMSIS\Device\ST\STM32F4xx\Include\stm32f4*.h:#define USART_CR1_TXEIE USART_CR1_TXEIE_Msk /*!<PE Interrupt Enable */The comment i...