串口二法数据，会漏数据。

小马过河 · 发表于 2015-4-27 15:20:04

main函数里
        for(t=0;t<2;t++)
        {
         USART2->DR=USART_RX_BUF3[t];//0X7E;//
         //delay_ms(10);
         while((USART2->SR&0X40)==0);//
        }
#if EN_USART2_RX   //??????????????
void USART2_IRQHandler(void)                //?®??1????·??????ò
{
u8 Res;
#ifdef OS_TICKS_PER_SEC //?????±?????????¨????,???÷??????ucosII??.
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //????????(????????????±?????0x0d 0x0a?á??)
  {
  Res =USART_ReceiveData(USART2);//(USART1->DR); //????????????????

  USART_RX_STA2|=0x8000; //?????ê????

  if((USART_RX_STA2&0x8000)==0)//???????ê??
   {
   if(USART_RX_STA2&0x4000)//????????0x0d
    {
    if(Res!=0x0a)USART_RX_STA2=0;//?????í?ó,????????
    else USART_RX_STA2|=0x8000; //?????ê????
    }
   else //????????0X0D
    {
    if(Res==0x0d)USART_RX_STA2|=0x4000;
    else
     {
     USART_RX_BUF2[USART_RX_STA2&0X3FFF]=Res ;
     USART_RX_STA2++;
     if(USART_RX_STA2>(USART_REC_LEN-1))USART_RX_STA2=0;//?????????í?ó,????????????
     }
    }
   }

     }
#ifdef OS_TICKS_PER_SEC //?????±?????????¨????,???÷??????ucosII??.
OSIntExit();
#endif
}
#endif

void uart2_init(u32 bound)
{
    //GPIO?????è??
    GPIO_InitTypeDef GPIO_InitStructure;
   USART_InitTypeDef USART_InitStructure;
   NVIC_InitTypeDef NVIC_InitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //????USART1??GPIOA?±?? RCC_APB1Periph_UART4    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); //GPIOA?±??RCC_APB2Periph_USART1
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
  RCC->APB2ENR|=1<<8;   //????PORTG???±??
  RCC->APB1ENR|=1<<17; //?????®???±??
  USART_DeInit(USART2); //?????®??1
//USART1_TX   PA.2
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.9
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ì????
    GPIO_Init(GPIOA, &GPIO_InitStructure); //??????PA9

    //USART1_RX   PA.3
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//????????
    GPIO_Init(GPIOA, &GPIO_InitStructure); //??????PA10

//Usart1 NVIC ????

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//??????????3
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //×???????3
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   //IRQ?¨??????
   NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷

   //USART ???????è??

USART_InitStructure.USART_BaudRate = bound;//??°??è????9600;
//USART2->BRR=(36*1000000)/(bound);// ?¨?????è??
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×??¤??8??????????
USART_InitStructure.USART_StopBits = USART_StopBits_1;//??????????
USART_InitStructure.USART_Parity = USART_Parity_No;//?????????é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//???????????÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //??·?????

    USART_Init(USART2, &USART_InitStructure); //???????®??
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//????????
    USART_Cmd(USART2, ENABLE);                    //?????®??
}

其中，u8 USART_RX_BUF3[30]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39
  ,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59};
我发现如果设置t<1,显示30，如果t<2以上，则会漏掉30，即从31开始发到串口，好神奇啊，好费解