//重定义fputc函数
int fputc(int ch, FILE *f)
{        
        while((USART1->SR&0X40)==0);//循环发送,直到发送完毕   
        USART1->DR = (u8) ch;     
        while((USART2->SR&0X40)==0);//循环发送,直到发送完毕   
        USART2->DR = (u8) ch;          
        return ch;
}


。。。。。

void uart_init(u32 bound){
   //GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
       
       
        /////////////////////////////////////////////////////////////////////
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
         /* Enable USART1 clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Enable USART2 clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

        //串口1对应引脚复用映射
        GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
        GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
        //串口2对应引脚复用映射
        GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);
        GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);
               
        //USART1端口配置
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_2 | GPIO_Pin_3; //GPIOA9与GPIOA10
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;        //速度50MHz
        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
        GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA9，PA10       
       
/* USART1  Configure */
  USART_InitStructure.USART_BaudRate = 19200;
  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;

  /* Configure the USART1 */
  USART_Init(USART1, &USART_InitStructure);
  /* INIT  USART1 */
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);

/* USART2  Configure */
  USART_InitStructure.USART_BaudRate = 19200;
  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;

  /* Configure the USART2 */
  USART_Init(USART2, &USART_InitStructure);
  /* INIT  USART2 */
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);
//////////////////////////////////////////////////////////////////////

#if EN_USART1_RX       
        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启相关中断

        //Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//抢占优先级3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;                //子优先级3
        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、

#endif

#if EN_USART2_RX       
        USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启相关中断
        //Usart2 NVIC 配置
        NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;//串口2中断通道
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//抢占优先级1
        NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;                //子优先级1
        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、



#endif
       
}
这是USART的主要代码，其他的包含在附件的，求大佬们看看是哪里的问题。

图片上以1.293为分界线，上面是USART1正常的数据，下面是USART2有问题的数据。