STM32L151 usart2 串口2 程序

void USART2_config(unsigned int BaudRate)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	USART_InitTypeDef USART_InitStructure;
    
	/* Enable the USART2 Pins Software Remapping */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
    
	/* Configure USART2 Rx (PA.03) as input floating */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;   
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; 	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	//GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
    
	/* Configure USART2 Tx (PA.02) as alternate function push-pull */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	//GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
    
	/* Enable the USART2 Interrupt */
	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);    
    
	USART_InitStructure.USART_BaudRate = BaudRate; 
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1; 
	USART_InitStructure.USART_Parity = USART_Parity_No; 
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	  
    
	USART_Init(USART2, &USART_InitStructure);
	USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
	//USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
	/* Enable USART2 */
	USART_Cmd(USART2, ENABLE);
		
	USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
		
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);
}

void USART2_IRQHandler(void)
{
	unsigned char temp=0;
	
	if(USART_GetITStatus(USART2,USART_IT_RXNE)!=RESET)
	{  
		temp=USART_ReceiveData(USART2);
		USART_ClearFlag(USART2,USART_FLAG_RXNE);
		
		usart2_race_buf[usart2_race_count] = temp;
		usart2_race_count++;
		if(usart2_race_count>=2)
		{
			usart2_race_count = 0;
			usart2_race_over = 1;
		}
	}  
}

void USART2_send_all(unsigned char *byte,unsigned char send_mun)
{
	unsigned char i;

	for(i=0;i

接项目  代编程  13810175694    QQ727341554