求助，STM32串口接收进入不了中断

void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;



#ifdef VECT_TAB_RAM 



NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); 

#else 



NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); 

#endif



/* Configure one bit for preemption priority */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);



/*UART2*/

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

/*timer2*/

NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);



}

void USART_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

USART_ClockInitTypeDef USART_ClockInitStructure;



//使能串口1，PA，AFIO总线

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO ,ENABLE );

RCC_APB1PeriphClockCmd( RCC_APB1Periph_USART2 ,ENABLE);



/* A9 USART1_Tx */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //推挽输出-TX

GPIO_Init(GPIOA, &GPIO_InitStructure);



/* A10 USART1_Rx */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入-RX

GPIO_Init(GPIOA, &GPIO_InitStructure);





USART_InitStructure.USART_BaudRate = 115200;

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_ClockInitStructure.USART_Clock = USART_Clock_Disable;

// USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;

// USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;

// USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;

//

// USART_ClockInit(USART2, &USART_ClockInitStructure);

USART_Init(USART2, &USART_InitStructure);

/* Enable the USARTx */

USART_Cmd(USART2, ENABLE);

//串口1使用接收中断

USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);



}







void USART2_IRQHandler(void)

{

u16 i; 



if(USART_GetFlagStatus(USART2,USART_IT_RXNE)==SET) 

{ 

i = USART_ReceiveData(USART2); 

USART_SendData(USART2,i); 

while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET) 

{ 

} 

}



if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) 

{ 



USART_ClearITPendingBit(USART2, USART_IT_RXNE);



}



//溢出-如果发生溢出需要先读SR,再读DR寄存器 则可清除不断入中断的问题

if(USART_GetFlagStatus(USART2,USART_FLAG_ORE)==SET)

{

USART_ClearFlag(USART2,USART_FLAG_ORE); //读SR

USART_ReceiveData(USART2); //读DR

}

}