STM32F1xx的5个串口使用方法

STM32F1系列芯片的5个串口初始化方法(有的芯片引脚少,只有3个串口)

串口是我们常用的一个数据传输接口,STM32F103系列单片机共有5个串口
  • 1-3是通用同步/异步串行接口USART(Universal Synchronous/ Asynchronous Receiver/ Transmitter)
  • 4、5是通用异步串行接口UART(Universal Asynchronous Receiver/Transmitter)
配置串口包括三部分内容:
  • I/O口配置:TXD配置为复用推挽输出(GPIO_Mode_AF_PP),RXD配置为浮空输入(GPIO_Mode_IN_FLOATING);
  • 串口配置:波特率,校验位,停止位等;
  • 中断向量配置:一般用中断方式接收数据。

注意事项

  1. USART1是挂在APB2,使能时钟命令为:
    RCC_APB2PeriphClockCmd ( RCC_APB2Periph_USART1, ENABLE );
    其他几个则挂在APB1上,如串口2:RCC_APB1PeriphClockCmd ( RCC_APB1Periph_USART2, ENABLE );
  2. 配置4口和5口的时候,中断名为UART4、UART5,中断入口分别为UART4_IRQn、UART5_IRQn
    对应的中断服务函数为void UART4_IRQHandler(void)void UART5_IRQHandler(void)
下面是5个串口的配置函数和收发数据函数代码:

串口1

void USART1_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;        
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE );
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure); //端口A;
	    
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入;
	GPIO_Init(GPIOA, &GPIO_InitStructure); //端口A;
	
	USART_InitStructure.USART_BaudRate = 9600; //波特率;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位;
	USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位;
	USART_InitStructure.USART_Parity = USART_Parity_No ; //无校验位;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	//无硬件流控;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	//收发模式;
	USART_Init(USART1, &USART_InitStructure);//配置串口参数;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断组,4位抢占优先级,4位响应优先级;
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //中断号;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
	USART_Cmd(USART1, ENABLE); //使能串口;
}

void USART1_Send_Byte(u8 Data) //发送一个字节;
{
	USART_SendData(USART1,Data);
	while( USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET );
}

void USART1_Send_String(u8 *Data) //发送字符串;
{
	while(*Data)
	USART1_Send_Byte(*Data++);
}

void USART1_IRQHandler(void) //中断处理函数;
{
	u8 res;    
	if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET) //判断是否发生中断;
	{
		USART_ClearFlag(USART1, USART_IT_RXNE); //清除标志位;
		res=USART_ReceiveData(USART1); //接收数据;
		USART1_Send_Byte(res); //用户自定义;
	}  
} 

串口2

void USART2_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;        
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE );
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;          //USART2 TX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用推挽输出;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);             //端口A;
	    
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;               //USART2 RX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   //浮空输入;
	GPIO_Init(GPIOA, &GPIO_InitStructure);                  //端口A;
	
	USART_InitStructure.USART_BaudRate = 9600;                  //波特率;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;      //停止位1位;
	USART_InitStructure.USART_Parity = USART_Parity_No ;        //无校验位;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件流控;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;                //收发模式;
	USART_Init(USART2, &USART_InitStructure);//配置串口参数;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断组,4位抢占优先级,4位响应优先级;
	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //中断号;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
	USART_Cmd(USART2, ENABLE); //使能串口;
}

void USART2_Send_Byte(u8 Data) //发送一个字节;
{
	USART_SendData(USART2,Data);
	while( USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET );
}

void USART2_Send_String(u8 *Data) //发送字符串;
{
	while(*Data)
	USART2_Send_Byte(*Data++);
}

void USART2_IRQHandler(void) //中断处理函数;
{
	u8 res;    
	if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET) //判断是否发生中断;
	{
		USART_ClearFlag(USART2, USART_IT_RXNE); //清除标志位;
		res=USART_ReceiveData(USART2); //接收数据;
		USART2_Send_Byte(res); //用户自定义;
	}  
} 

串口3

void USART3_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;        
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE );
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;          //USART3 TX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;     //复用推挽输出;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);              //端口B;
	    
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //USART3 RX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入;
	GPIO_Init(GPIOB, &GPIO_InitStructure); //端口B;
	
	USART_InitStructure.USART_BaudRate = 9600; //波特率;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位;
	USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位;
	USART_InitStructure.USART_Parity = USART_Parity_No ; //无校验位;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件流控;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//收发模式;
	USART_Init(USART3, &USART_InitStructure);//配置串口参数;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断组,4位抢占优先级,4位响应优先级;
	NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //中断号;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
	USART_Cmd(USART3, ENABLE); //使能串口;
}

void USART3_Send_Byte(u8 Data) //发送一个字节;
{
	USART_SendData(USART3,Data);
	while( USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET );
}

void USART3_Send_String(u8 *Data) //发送字符串;
{
	while(*Data)
	USART3_Send_Byte(*Data++);
}

void USART3_IRQHandler(void) //中断处理函数;
{
	u8 res;    
	if(USART_GetITStatus(USART3, USART_IT_RXNE) == SET) //判断是否发生中断;
	{
		USART_ClearFlag(USART3, USART_IT_RXNE); //清除标志位;
		res=USART_ReceiveData(USART3); //接收数据;
		USART3_Send_Byte(res); //用户自定义;
	}  
} 

64脚以上的芯片才有
串口4

void UART4_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;        
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE );
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE );
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //UART4 TX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOC, &GPIO_InitStructure); //端口C;
	    
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //UART4 RX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入;
	GPIO_Init(GPIOC, &GPIO_InitStructure); //端口C;
	
	USART_InitStructure.USART_BaudRate = 9600; //波特率;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位;
	USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位;
	USART_InitStructure.USART_Parity = USART_Parity_No ; //无校验位;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	//无硬件流控;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	//收发模式;
	USART_Init(UART4, &USART_InitStructure);//配置串口参数;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断组,4位抢占优先级,4位响应优先级;
	NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; //中断号;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
	USART_Cmd(UART4, ENABLE); //使能串口;
}

void UART4_Send_Byte(u8 Data) //发送一个字节;
{
	USART_SendData(UART4,Data);
	while( USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET );
}

void UART4_Send_String(u8 *Data) //发送字符串;
{
	while(*Data)
	UART4_Send_Byte(*Data++);
}

void UART4_IRQHandler(void) //中断处理函数;
{
	u8 res;    
	if(USART_GetITStatus(UART4, USART_IT_RXNE) == SET) //判断是否发生中断;
	{
		USART_ClearFlag(UART4, USART_IT_RXNE); //清除标志位;
		res=USART_ReceiveData(UART4); //接收数据;
		UART4_Send_Byte(res); //用户自定义;
	}  
} 

64脚以上的芯片才有
串口5

void UART5_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;        
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE );
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE );
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;         //UART5 TX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用推挽输出;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOC, &GPIO_InitStructure);             //端口C;
	    
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;              //UART5 RX;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //浮空输入;
	GPIO_Init(GPIOD, &GPIO_InitStructure);                 //端口D;
	
	USART_InitStructure.USART_BaudRate = 9600;                  //波特率;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;      //停止位1位;
	USART_InitStructure.USART_Parity = USART_Parity_No ;        //无校验位;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  //无硬件流控;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;                  //收发模式;
	USART_Init(UART5, &USART_InitStructure);                                         //配置串口参数;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断组,4位抢占优先级,4位响应优先级;
	NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //中断号;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
	USART_Cmd(UART5, ENABLE); //使能串口;
}

void UART5_Send_Byte(u8 Data) //发送一个字节;
{
	USART_SendData(UART5,Data);
	while( USART_GetFlagStatus(UART5, USART_FLAG_TC) == RESET );
}

void UART5_Send_String(u8 *Data) //发送字符串;
{
	while(*Data)
	UART5_Send_Byte(*Data++);
}

void UART5_IRQHandler(void) //中断处理函数;
{
	u8 res;    
	if(USART_GetITStatus(UART5, USART_IT_RXNE) == SET) //判断是否发生中断;
	{
		USART_ClearFlag(UART5, USART_IT_RXNE); //清除标志位;
		res=USART_ReceiveData(UART5); //接收数据;
		UART5_Send_Byte(res); //用户自定义;
	}  
} 
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