STM32 USART串口配置与中断

void USARTx_init(u32 bound)

1.端口结构体设置

GPIO_InitTypeDef GPIO_InitStructure; //定义GPIO结构体
USART_InitTypeDef USART_InitStructure; //定义USART结构体
NVIC_InitTypeDef NVIC_InitStructure; //定义NVIC结构体

2.使能时钟

RCC_AHBxPeriphClockCmd(RCC_AHBxPeriph_GPIOx,ENABLE); //使能GPIO时钟 RCC_APBxPeriphClockCmd(RCC_APBxPeriph_USARTx,ENABLE); //使能USART时钟复3.USART引脚复映射

GPIO_PinAFConfig(GPIOx,GPIO_PinSourcex,GPIO_AF_USARTx); //GPIO口复映射为USART端口

4.GPIO端口配置

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x;         //选择对应引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;        //引脚模式配置为复用模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;        //50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;         //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;        //上拉输出
GPIO_Init(GPIOx,&GPIO_InitStructure);        //初始化

5.USART初始化设置

USART_InitStructure.USART_BaudRate = bound;        //波特率设置定义USARTx_Init(u32 bound)
USART_InitStructure.USART_WordLength = USART_WordLength_8b;        //8位输出模式
USART_InitStructure.USART_StopBits = USART_StopBits_1;        //一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;        //奇偶校验关
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(USARTx, &USART_InitStructure);        //初始化串口
USART_Cmd(USARTx, ENABLE);        //使能串口

6.串口标志位清零

USART_ClearFlag(USARTx, USART_FLAG_TC);

7.开启串口中断

USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);

8.NVIC配置

NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn; //开启USART通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;        //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;       //响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //开启
NVIC_Init(&NVIC_InitStructure);        //初始化

9.串口接受数据，配置中断函数

void USARTx_IRQHandler(void)  
{
	u8 rec_data;
	if(USART_GetITStatus(USARTx, USART_IT_RXNE) != RESET)  //
		{
				rec_data =(u8)USART_ReceiveData(USARTx);         //使用USART_ReceiveData(USARTx)读取接收到的数据
        if(rec_data=='S')		  	                         //设置起始位为‘S’
				{
					uart_byte_count=0x01; 
				}

	    else if(rec_data=='E')		                         //终端位为‘E’
				{
					if(strcmp("Light_led1",(char *)receive_str)==0)        
                        LED1=0;    //设置收到数据执行操作，点灯
					else if(strcmp("Close_led1",(char *)receive_str)==0)   
                        LED1=1;    //设置收到数据执行操作，关灯
                    for(usart_byte_count=0;usart_byte_count<32;usart_byte_count++)
                        receive_str[usart_byte_count]=0x00;
					usart_byte_count=0;    
				}				  
		else if((usart_byte_count>0)&&(usart_byte_count<=USARTx_REC_NUM))
				{
				   receive_str[usart_byte_count-1]=rec_data;
				   usart_byte_count++;
				}                		 
   } 
}

10.串口发送数据，函数

void USARTxSendChar(u8 ch)  //u8=char    发送一个字符
{      
	while((USARTx->SR&0x40)==0);  
    USARTx->DR = (u8) ch;      
}

void USARTxSendChars(u8 *str, u16 strlen)    //发送字符串
{ 
    u16 k= 0 ; 
    do { uart6SendChar(*(str + k)); k++; }     
    while (k < strlen); 
}

STM32 USART串口配置与中断

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