USART3接收中断进不去

MF · 发表于 2016-10-18 11:25:54

大家好，最近在做一个小东西，用的原子哥的例子修改而成，用到USART1，USART2和USART3，前面两个都没什么问题，用到USART3的时候，发送数据没问题，但是接收数据的时候中断进不去。下面是代码，请各位朋友帮忙分析一下问题。

void uart3_init(u32 bound){

  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //开启USART3外设时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //开启GPIO时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //管脚复用

//USART3_TX  PB10
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  //USART3_RX    PB11
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;1
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  //Usart3 中断配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

//USART3 参数设置

USART_InitStructure.USART_BaudRate = bound;
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(USART3, &USART_InitStructure);
   USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
   USART_Cmd(USART3, ENABLE);
}

接收中断函数：
#if EN_USART3_RX
void USART3_IRQHandler(void)
{
u8 Res;
#if SYSTEM_SUPPORT_OS
OSIntEnter();
#endif
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
{
Res =USART_ReceiveData(USART3);
if((USART3_RX_STA&0x8000)==0)
{
if(USART3_RX_STA&0x4000)
{
if(Res!=0x0a)USART3_RX_STA=0;
else {
USART3_RX_STA|=0x8000;
USART3_SendU8(USART3_RX_BUF,USART_GetBufLen(USART3_RX_STA));
USART3_SendStr("11111111111111111111111\r\n");
USART3_RX_STA=0;
}
}
else
{
if(Res==0x0d)USART3_RX_STA|=0x4000;
else
{
USART3_RX_BUF[USART3_RX_STA&0X3FFF]=Res ;
USART3_RX_STA++;
if(USART3_RX_STA>(USART3_REC_LEN-1))USART3_RX_STA=0;
}
}
}
   }
#if SYSTEM_SUPPORT_OS
OSIntExit();
#endif
}
#endif

谢谢！！！