uart_init()
1 void uart_init(u32 bound) 2 { 3 //GPIO 端口设置 4 GPIO_InitTypeDef GPIO_InitStructure; 5 USART_InitTypeDef USART_InitStructure; 6 NVIC_InitTypeDef NVIC_InitStructure; 7 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, 8 ENABLE); //使能 USART1， GPIOA 时钟 9 10 11 12 //USART1_TX GPIOA.9 13 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9 14 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 15 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 16 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化 GPIOA.9 17 //USART1_RX GPIOA.10 初始化 18 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10 19 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入 20 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化 GPIOA.10 21 22 23 //Usart1 NVIC 配置 24 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; 25 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=7 ;//抢占优先级 7 26 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级 0 27 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ 通道使能 28 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化 VIC 寄存器 29 30 31 32 //USART 初始化设置 33 USART_InitStructure.USART_BaudRate = bound; //串口波特率 34 USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为 8 位数据格式 35 USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位 36 USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位 37 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; 38 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式 39 USART_Init(USART1, &USART_InitStructure); //初始化串口 1 40 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断 41 USART_Cmd(USART1, ENABLE); //使能串口 1 42 }