将下列程序改为对USART1进行配置: RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx|USART_Mode_Tx; USART_Init(USART3,&USART_InitStructure); USART_Cmd(USART3, ENABLE); USART_ITConfig(USART3,USART_IT_RXNE,ENABLE); USART_ITConfig(USART3,USART_IT_TXE ,ENABLE);