STM32F103ZET6的串口数据接收问题

void bound)
{
   //GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);


/*  配置GPIO的模式和IO口 */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//TX      //串口输出PA9
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;     //复用推挽输出
GPIO_Init(GPIOB,&GPIO_InitStructure);  /* 初始化串口输入IO */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;//RX    //串口输入PA10
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOAtiNG;    //模拟输入
GPIO_Init(GPIOB,&GPIO_InitStructure); /* 初始化GPIO */
    //USART1 初始化设置
USART_InitStructure.USART_BaudRate = bound;//波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART3, &USART_InitStructure); //初始化串口3

USART_Cmd(USART3, ENABLE);  //使能串口3

USART_GetFlagStatus(USART3, USART_FLAG_TC);
  
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启相关中断

USART_ITConfig(USART3, USART_IT_IDLE, ENABLE);//开启空闲中断 //Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;//串口3中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority =2;  //子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器、
}