4-STM32F103的串口中断与空闲中断接收数据

STM32F103的串口中断与空闲中断接收数据

1.引脚配置

void Uart_Init(u32 bound)
{
	//GPIO端口设置
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);	//使能USART1，GPIOA时钟

	//USART1_TX   GPIOA.9
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9

	//USART1_RX	  GPIOA.10初始化
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  

	//Usart1 NVIC 配置
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;//抢占优先级3
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;		//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 
}

2.中断处理

void USART1_IRQHandler(void)                	//串口1中断服务程序
{
	if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET)  //接收中断
	{	
		USART_ClearITPendingBit(USART1, USART_IT_RXNE);
		uart1_rx_buf[uart1_rx_len]=USART_ReceiveData(USART1);	//读取接收到的数据
		uart1_rx_len++;
  } 
	// 空闲中断的时候说明串口没数据了，收集完成
  else if(USART_GetITStatus(USART1, USART_IT_IDLE) == SET)
  {
		USART1->SR;
    USART1->DR;//清除中那标志位
		uart1_rx_done=1;
	}
	else
	{
	}
} 

3.串口发送

u8 Usart1_Send(u8 * data,u16 len)
{
	u16 i=0;
	if(len<1)return 0;
	for(i=0;i<len;i++)
	{
		USART_SendData(USART1,data[i]);
		while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//等待发送结束
	}
	return 1;
}

4.串口解析

void Usart1_Data_Analyse()
{
	if(uart1_rx_done==1)
	{
		Usart1_Send(uart1_rx_buf,uart1_rx_len);
		uart1_rx_len=0;
		uart1_rx_done=0;
	}
	
}