stm32f103c8t6串口 usart1只能发送不能接受

这几天一直在搞毕设，需要通过串口用电脑控制单片机，用的是usart1，调了好几天，死活就是只能发送数据，不能接受数据，下面是我的配置函数和串口中断处理函数，求指导！！！
//串口引脚初始化
void Init_Usart(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;               
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;         
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;       
GPIO_Init(GPIOA, &GPIO_InitStructure);                      

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   
GPIO_Init(GPIOA, &GPIO_InitStructure);                  

}

//串口配置函数
void Usart_Configuration(uint32_t BaudRate)
{
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
USART_InitStructure.USART_BaudRate =BaudRate ;

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_ITConfig(USART1,USART_IT_RXNE,ENABLE);

USART_Cmd(USART1, ENABLE);

}

//串口中断处理函数
void USART1_IRQHandler(void)
{
uint8_t ReceiveDate;

if(!(USART_GetITStatus(USART1,USART_IT_RXNE)))

{
    USART_ClearITPendingBit(USART1,USART_IT_RXNE);  
    ReceiveDate=USART_ReceiveData(USART1);          
    printf("%d",(char *)ReceiveDate);               

    printf("\n\r");                                 
}  

}
//串口中断NVIC配置函数
void Init_NVIC(void)
{

NVIC_InitTypeDef NVIC_InitStructure;

#ifdef VECT_TAB_RAM

  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);   
#else  

  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);                                                  
#endif

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;           
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;   
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;          
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;             
NVIC_Init(&NVIC_InitStructure);                                 
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

}

调了好几天了，实在是高不出来了，求大神指导！！！！！！！跪谢！！

中断函数写错了亲，应该是进入中断之后清中断吧，为真才能进去

我看你的配置，除了RCC_APB2PeriphClockCmd基本没什么问题，你需要加上RCC_APB2Periph_AFIO，要不然IO口的AF功能用不了，而你串口IO需要用到AF功能，看下
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1, ENABLE);

测试接收前首先要保证MCU的RX脚能接收到正确的波形

中断程序

void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //½ÓÊÕÖжÏ(½ÓÊÕµ½µÄÊý¾Ý±ØÐëÊÇ0x0d 0x0a½áβ)
        {
        Res =USART_ReceiveData(USART1); //¶ÁÈ¡½ÓÊÕµ½µÄÊý¾Ý

        if((USART_RX_STA&0x8000)==0)//½ÓÊÕδÍê³É
            {
            if(USART_RX_STA&0x4000)//½ÓÊÕµ½ÁË0x0d
                {
                if(Res!=0x0a)USART_RX_STA=0;//½ÓÊÕ´íÎó,ÖØпªÊ¼
                else USART_RX_STA|=0x8000;  //½ÓÊÕÍê³ÉÁË 
                }
            else //»¹Ã»ÊÕµ½0X0D
                {   
                if(Res==0x0d)USART_RX_STA|=0x4000;
                else
                    {
                    USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
                    USART_RX_STA++;
                    if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//½ÓÊÕÊý¾Ý´íÎó,ÖØпªÊ¼½ÓÊÕ      
                    }        
                }
            }            
     } 
        }

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看看是不是485芯片用错了，比如sp3485用成了max485的型号。