STM32F4 STD标准库串口接收中断+空闲中断例程

• 🔖工程基于STM32F446

✨用惯了STM32CubeMX傻瓜式配置，突然改用标准库写代码，初始化外设内容，总是丢三落四的。

📗串口初始化配置

void uart_init(uint32_t bound)
{
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);	//使能USART1，GPIOA时钟
    /* Enable GPIO clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    /* Connect PXx to USARTx_Tx*/
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);

    /* Connect PXx to USARTx_Rx*/
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
    //USART1_TX   GPIOA.9
    /* Configure USART Tx as alternate function  */
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure USART Rx as alternate function  */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    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

    //USART 初始化设置
    USART_InitStructure.USART_BaudRate = bound;//串口波特率
    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_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
    USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//开启串口空闲中断
    USART_Cmd(USART1, ENABLE); //使能串口1

}

📘串口中断函数

void USART1_IRQHandler(void)	//串口1中断服务程序
{
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {
        // USART_ClearITPendingBit(USART1, USART_IT_RXNE); //清标志位
//        USART_RX_BUF[length] = USART_ReceiveData(USART1);//读取接收到的数据
         USART_RX_BUF[length] = USART1->DR & 0x0FF;
        length++;
    } else if(USART_GetFlagStatus(USART1, USART_FLAG_IDLE) != RESET) { //空闲帧中断
            USART1->SR; //先读SR.再读DR
            USART1->DR; //清空寄存器
            length = 0;
            USART_RX_STA = 1; //数据接收 标志位
    }

}

📑接收数据所需的变量和宏定义

#define USART_REC_LEN   			64  	//定义最大接收字节数 64
#define EN_USART1_RX 			1		//使能（1）/禁止（0）串口1接收
uint8_t USART_RX_BUF[USART_REC_LEN]; //接收缓冲,最大USART_REC_LEN个字节.
//接收状态
uint8_t USART_RX_STA = 0; //接收状态标记
static __IO uint16_t length = 0;//接收数据时的下标

📒处理接收数据和释放空间

 if(USART_RX_STA) {
            USART_RX_STA = 0;//清标志位
            printf("Re:%s\n", USART_RX_BUF);
            memset(USART_RX_BUF, 0x00, sizeof(USART_RX_BUF));//清空接收数组
        }

• 🔬测试效果：
  

📚测试工程

链接：https://pan.baidu.com/s/13UxJawYkAkpIb8SzhSnpqg?pwd=8rc0 
提取码：8rc0