https://www.st.com/content/ccc/resource/training/technical/product_training/group0/b1/26/c3/87/d8/7a/42/27/STM32H7-Peripheral-USART_interface_USART/files/STM32H7-Peripheral-USART_interface_USART.pdf/_jcr_content/translations/en.STM32H7-Peripheral-USART_interface_USART.pdf 最高大概是12.5 Mbaud，我看是不行，通常用115200，波特率高了会增大误码率，尤其是用杜邦线的情况。