stm32l152vbt6同时打开三个USART接收中断

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stm32l152vbt6同时打开三个USART接收中断，USART2接收中断**.....


单独USART2接收中断正常，与USART1和3同时用就**了，寄存器参数正常。

int main(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
        
        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);
        
        NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
        
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOD, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
        
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
        
        GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_USART2);
        GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_USART2);
        GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_USART2);
        GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_USART3);
        GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_USART3);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_8|GPIO_Pin_9;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOD, &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_Init(USART1, &USART_InitStructure);
  USART_Cmd(USART1, ENABLE);
        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
        
        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_CTS;
  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);
        
        USART_InitStructure.USART_BaudRate = 38400;
  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_Cmd(USART3, ENABLE);
        USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
        
        USART1->SR;
        USART2->SR;
        USART3->SR;
  while (1)
  {
        }
}