stm32f103串口3的接收中断进不去

攻城狮小黄提问时间：2017-9-23 09:20 /

以下是我的串口3的初始化程序和中断程序，大神们请帮小弟看看，问题出在哪儿了，不胜感激
void USART3_Init(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef  NVIC_InitStructure;

/* config USART3 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

/* USART3 GPIO config */
/* Configure USART3 Tx (PB.10) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure USART3 Rx (PB.11) as input floating */
GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/* USART3 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(USART3, &USART_InitStructure);

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
      USART_Cmd(USART3, ENABLE);
}

void USART3_IRQHandler(void)
{

  if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
  {
/* Read one byte from the receive data register */
RXBuffer[RXCounter++] = (USART_ReceiveData(USART3) & 0x7F);

/* Clear the USART1 Receive interrupt */
USART_ClearITPendingBit(USART3, USART_IT_RXNE);

if(RXCounter == 100)
{
   /* Disable the USART Receive interrupt */
   USART_ITConfig(USART3, USART_IT_RXNE, DISABLE);
}
}
}