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hello,
obviously there is a small bug in CMSIS USART Driver STM32F4xx Rev 2.3:
line 1808: else if (usart->reg == USART3) { __HAL_RCC_USART2_CLK_ENABLE(); }
correction: else if (usart->reg == USART3) { __HAL_RCC_USART3_CLK_ENABLE(); }