STM32串口USART2（接蓝牙）不能接收手机端发送的字符，求解决，感激不尽！

STM32串口USART2（接蓝牙）不能接收手机端发送的字符，求解决，感激不尽！
急急急急急急！谢谢
此函数能够通过STM32发送字符串给串口（蓝牙HC06），然后发送给手机端，但是手机端发送字符串给STM32，STM32不能接收解析，求解决方案
usart函数：
void uart_init(u32 br_num)
{
USART_InitTypeDef USART_InitStructure;
//  USART_ClockInitTypeDef USART_ClockInitStruct;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//¿ªÆôUSART1ʱÖÓ
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
//ÅäÖÃPA2×÷ΪUSART1¡¡Tx
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA , &GPIO_InitStructure);
//ÅäÖÃPA3×÷ΪUSART1¡¡Rx
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOAtiNG;
GPIO_Init(GPIOA , &GPIO_InitStructure);
   //Usart2 NVIC
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 0 ;//************//
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //0-3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
NVIC_Init(&NVIC_InitStructure);
//ÅäÖÃUSART2
//Öжϱ»ÆÁ±ÎÁË
USART_InitStructure.USART_BaudRate = br_num;//br_num;       //²¨ÌØÂÊ¿ÉÒÔͨ¹ýµØÃæÕ¾ÅäÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;  //8λÊý¾Ý
USART_InitStructure.USART_StopBits = USART_StopBits_1;   //ÔÚÖ¡½áβ´«Êä1¸öֹͣλ
USART_InitStructure.USART_Parity = USART_Parity_No;    //½ûÓÃÆæżУÑé
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //Ó²¼þÁ÷¿ØÖÆʧÄÜ
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;  //·¢ËÍ¡¢½ÓÊÕʹÄÜ
//  //ÅäÖÃUSART1ʱÖÓ
//  USART_ClockInitStruct.USART_Clock = USART_Clock_Disable;  //ʱÖӵ͵çƽ»î¶¯
//  USART_ClockInitStruct.USART_CPOL = USART_CPOL_Low;  //SLCKÒý½ÅÉÏʱÖÓÊä³öµÄ¼«ÐÔ->µÍµçƽ
//  USART_ClockInitStruct.USART_CPHA = USART_CPHA_2Edge;  //ʱÖÓµÚ¶þ¸ö±ßÑؽøÐÐÊý¾Ý²¶»ñ
//  USART_ClockInitStruct.USART_LastBit = USART_LastBit_Disable; //×îºóһλÊý¾ÝµÄʱÖÓÂö³å²»´ÓSCLKÊä³ö
USART_Init(USART2, &USART_InitStructure);
//  USART_ClockInit(USART2, &USART_ClockInitStruct);
//ʹÄÜUSART1½ÓÊÕÖжÏ
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//ʹÄÜUSART1
USART_Cmd(USART2, ENABLE);
}

u8 TxBuffer[256];
u8 TxCounter=0;
u8 count=0;
u8 RxBuffer[16]={0};
static u8 RxState = 0;

void Uart2_IRQ(void)
{
if (USART_GetFlagStatus(USART2, USART_FLAG_ORE) != RESET)//??!????if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)???
    {
        USART_ReceiveData(USART2);
    }
  
//·¢ËÍÖжÏ
if((USART2->SR & (1<<7))&&(USART2->CR1 & USART_CR1_TXEIE))//if(USART_GetITStatus(USART1,USART_IT_TXE)!=RESET)
{
  USART2->DR = TxBuffer[TxCounter++]; //дDRÇå³ýÖжϱêÖ¾         
  if(TxCounter == count)
  {
   USART2->CR1 &= ~USART_CR1_TXEIE;  //¹Ø±ÕTXEÖжÏ
   //USART_ITConfig(USART1,USART_IT_TXE,DISABLE);
  }
}
//½ÓÊÕÖÐ¶Ï (½ÓÊռĴæÆ÷·Ç¿Õ)
if(USART2->SR & (1<<5))//if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)   
{
  u8 com_data = USART2->DR;
  static u8 _data_len = 0,_data_cnt = 0;
  if(RxState==0)//if(RxState==0&&com_data==0xAA)
  {
   RxState=1;
   RxBuffer[0]=com_data;
  }
  else if(RxState==1)//if(RxState==1&&com_data==0xAF)
  {
   RxState=0;
   
   RxBuffer[1]=com_data;
  }
}
}

主函数中循环：
while(1)
{
  if(RxBuffer[0] == 'c' | RxBuffer[1] == 'c' )//0x64 'c' && stateXoled == 0
  {
   printf("$%d*",RxBuffer[0]);
   BELL=1;
   delay_ms(500);
   BELL=0;
   stateXoled = 0;
   FAN=1;  
   OLED_Display_Off();  
  }
  if(RxBuffer[0] == 'o' | RxBuffer[1] == 'o')//0x6f 'o' && stateXoled == 1
  {
//      printf("$%d?",RxBuffer[0]);
   stateXoled = 1;
   FAN=0;/*´ò¿ªPM2.5*/
   OLED_Display_On();   
  }
  
  if(RxBuffer[0] == 0x73 ) //'s'
  { readFile();/*·¢ËÍÊý¾Ý */     }
//     printf("$%d$",RxBuffer[0]);
  RxBuffer[0] = 0x00;  //»º´æÇå¿Õ   
}  
上述程序曾置于定时器中断中，也不能行！程序有3个定时器中断（先占优先级：0， 从占：1 2 3），一个串口中断（先占：0,从占：0）
求大神指点！！！！！！！！！！！！！！