本帖最后由 aizaixiyuanqian 于 2018-7-31 22:27 编辑
- void usart_init()
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能 GPIOA 时钟
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);// USART2时钟使能
- //连接PXx到串口USARTx
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //PA2 复用 USART2
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //PA3复用 USART2
- //GPIO初始化
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; //复用
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- //配置串口
- USART_InitStructure.USART_BaudRate = 115200; //波特率
- USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位
- USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位
- USART_InitStructure.USART_Parity = USART_Parity_No; //校验
- USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //使能发送与接收
- USART_Init(USART2, &USART_InitStructure);
- USART_Cmd(USART2, ENABLE); //串口使能
- USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
- NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority =2;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
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