请大大帮我看看stm32 usart2的配置以及中断函数有问题没

翔云李

配置以及配置中断函数：

void USART2_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

/* config USART2 clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

/* USART2 GPIO config */

   /* Configure USART2 Tx (PA.02) as alternate function push-pull */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

   

  /* Configure USART2 Rx (PA.03) as input floating */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

 

/* USART2 mode config */

USART_InitStructure.USART_BaudRate = 9600;

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_Cmd(USART2, ENABLE);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); 

}

void NVIC_Configuration2(void)

{

NVIC_InitTypeDef NVIC_InitStructure; 

/* Configure the NVIC Preemption Priority Bits */  

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

/* Enable the USARTy Interrupt */

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);

}


下面是中断函数：

void USART2_IRQHandler(void)

{

u8 c;

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

{

c=USART_ReceiveData(USART2);

USART_SendData(USART2,c); 

//printf("%c",c);    //将接受到的数据直接返回打印

}  

}

老是感觉有问题但是又查不出，唉。。

745021926

不能接收还是不能发送？

翔云李

回复【2楼】745021926:
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不能接收啊！！！能发送