STM32F407串口1的初始化

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void uart_init(u32 bound){
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//使能USART1时钟
 
    //串口1对应引脚复用映射
    GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
    GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
    
    //USART1端口配置
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9与GPIOA10
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    //速度50MHz
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
    GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA9，PA10

   //USART1 初始化设置
    USART_InitStructure.USART_BaudRate = bound;//波特率设置
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    //收发模式
    USART_Init(USART1, &USART_InitStructure); //初始化串口1
    
    USART_Cmd(USART1, ENABLE);  //使能串口1
    
    //USART_ClearFlag(USART1, USART_FLAG_TC);
    
#if EN_USART1_RX    
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启相关中断

    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//抢占优先级3
    NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;        //子优先级3
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQ通道使能
    NVIC_Init(&NVIC_InitStructure);    //根据指定的参数初始化VIC寄存器、

#endif
    
}