新手求教为什么串口接收数据总丢包

时间：10-02 整理：3721RD 点击：

接收数据为：BB 97 11 30 00 11 22 33 44 55 66 77 88 99 00 11 22 FD 6F 03 1A 0D 0A
加载中...

发送端一直不定时发此类数据
但是我用STM32F103RCT6单片机接收丢包挺多，丢包的频率很规律  应该是我程序代码没写严谨，求大神指点

void Init_NVIC(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;                      //?¨ò?ò???NVIC?òá?±í?á11ì?±?á?
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);       //éè???D??×é ?a2
      NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;                               //????′??ú1?a?D???′
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;          //éè?????èó??è??
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;                            //éè???±ó??è??
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                     //ê1?ü′??ú1?D??
      NVIC_Init(&NVIC_InitStructure);                                                                               //?ù?Y2?êy3?ê??ˉ?D????′??÷


      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;                               //????′??ú1?a?D???′
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =       0;          //éè?????èó??è??
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;                            //éè???±ó??è??
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                     //ê1?ü′??ú1?D??
      NVIC_Init(&NVIC_InitStructure);                                                                               //?ù?Y2?êy3?ê??ˉ?D????′??÷
      NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;                               //????′??ú1?a?D???′
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;          //éè?????èó??è??
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;                            //éè???±ó??è??
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                     //ê1?ü′??ú1?D??
      NVIC_Init(&NVIC_InitStructure);                                                                               //?ù?Y2?êy3?ê??ˉ?D????′??÷

      NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;                               //????′??ú1?a?D???′
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;          //éè?????èó??è??
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;                            //éè???±ó??è??
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                     //ê1?ü′??ú1?D??
      NVIC_Init(&NVIC_InitStructure);                                                                               //?ù?Y2?êy3?ê??ˉ?D????′??÷

}

void Init_Usart2(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;                                     //?¨ò?ò???GPIO?á11ì?±?á?
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO ,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 ,ENABLE);
                                                                                                                     //ê1?ü?÷?????úê±?ó￡???òa￡?￡?￡?
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;                               //????′??ú·￠?í???ú1ò?óμ?9???ú
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                         //?′ó?1|?üê?3??a??
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;                //???????ú?ù?è?a50M
  GPIO_Init(GPIOA, &GPIO_InitStructure);                                        //?ù?Y2?êy3?ê??ˉGPIOA??′??÷
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;       //?óê?
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;       //????ê?è?(?′??×′ì?);
  GPIO_Init(GPIOA, &GPIO_InitStructure);                                        //?ù?Y2?êy3?ê??ˉGPIOA??′??÷
}

void Usart2_Configuration(uint32_t BaudRate)
{
      USART_InitTypeDef USART_InitStructure;                                                                   //?¨ò?ò???′??ú?á11ì?
      USART_InitStructure.USART_BaudRate          = BaudRate ;                               //2¨ì??ê115200
      USART_InitStructure.USART_WordLength       = USART_WordLength_8b;       //′?ê?1y3ì?Dê1ó?8??êy?Y
      USART_InitStructure.USART_StopBits          = USART_StopBits_1;                //?ú???á?2′?ê?1??í￡?1??
      USART_InitStructure.USART_Parity             = USART_Parity_No ;                //????ê§?ü
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ó2?tá÷ê§?ü
      USART_InitStructure.USART_Mode             = USART_Mode_Rx | USART_Mode_Tx; //?óê?oí·￠?í?￡ê?
      USART_Init(USART2, &USART_InitStructure);                                                             //?ù?Y2?êy3?ê??ˉ′??ú??′??÷
      USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);                                                       //ê1?ü′??ú?D???óê?
      USART_Cmd(USART2, ENABLE);                                                                                           //ê1?ü′??úíaéè
}

void USART2_IRQHandler()
{
      int i=0;
      u8 a=0;
      extern u8 UART2_Save_data_box[UART2_Save_data_box_number];                         //·???UART2?óê?μ?μ?×??ú  Dèòaò?3?1é0
      extern u16 UART2_Save_data_box_pointer;                                                                //·???UART2?óê?μ?μ?×??úoD×ó??ò???êy?Y·???μ????????ò±ê??       Dèòaò?3?1é0
      extern u32 EPC_box[EPC_number];
      extern u16 EPC_box_pointer;
      extern u8 back_correct;
      extern u32 error1;
      extern u32 error2;
      extern u32 error3;
      extern u32 EPC_count_l;
      extern u32 EPC_count_h;
      extern u32 timer1;
      extern u8 zisuo3;


      if(USART_GetITStatus(USART2, USART_IT_RXNE) ！= RESET)          //?áè??óê??D??±ê????USART_IT_RXNE
                                                                                                            //USART_FLAG_RXNE:?óê?êy?Y??′??÷·???±ê????
                                                                                                            //1￡o?|×′ì?  0￡o???D(??ê?μ?êy?Y￡?μè′y?￡?￡?￡)
      {


            if(UART2_Save_data_box[0]==0xBB)                                                                                        //?D??êy?Y°üí·
            {
                     UART2_Save_data_box[UART2_Save_data_box_pointer]=USART_ReceiveData(USART2);    //?ìD?′?′￠êy?Y
                     UART2_Save_data_box_pointer++;


                     /*
                     if(UART2_Save_data_box[1]==0x98&&UART2_Save_data_box[5]==0x0D && UART2_Save_data_box[6]==0x0A) //?D??êy?Y°ü?2
                     {
                              for(i=1;i<4;i++)                                                 //????D￡?é?μ
                              {
                                    a+=(u8)UART2_Save_data_box;
                              }
                              if(a==UART2_Save_data_box[4])                         //D￡?é3é1|
                              {
                                    if(UART2_Save_data_box[3]==0x01)
                                    {
                                             back_correct=1;
                                             OUT2_LED=0;
                                    }
                                    else
                                    {
                                             back_correct=2;
                                    }
                              }
                              for(i=0;i<UART2_Save_data_box_number;i++)
                              {
                                    UART2_Save_data_box=0;                                  //ò?μ??D??μ?êy?Y°üμ??22??òêy×é3?ê??ˉ
                              }
                              UART2_Save_data_box_pointer=1;                               //ò?μ??D??μ?êy?Y°üμ??22??ò??1
                     }



                     else */if(UART2_Save_data_box[1]==0x97&&UART2_Save_data_box[21]==0x0D && UART2_Save_data_box[22]==0x0A) //?D??êy?Y°ü?2
                     {
                              for(i=1;i<20;i++)                                                 //????D￡?é?μ
                              {
                                    a+=(u8)UART2_Save_data_box;
                              }
                              if(a==UART2_Save_data_box[20])                         //D￡?é3é1|
                              {
                                    for(i=0;i<3;i++)
                                    {
                                             EPC_box[EPC_box_pointer]=(UART2_Save_data_box[i*4+5]<<24)+(UART2_Save_data_box[i*4+1+5]<<16)+(UART2_Save_data_box[i*4+2+5]<<8)+(UART2_Save_data_box[i*4+3+5]<<0);                //′?′￠EPC
                                             EPC_box_pointer++;
                                    }
                                    zisuo3=0;
                                    OUT1_jingbao=1;          //ê?3?±¨?ˉ
                                    timer1=0;                               //??ê±??0

                                    EPC_count_l++;             //±ê??×üêy+1
                                    if(EPC_count_l>=1000000000)
                                    {
                                             EPC_count_l=0;
                                             EPC_count_h++;
                                    }
                              }
                              else
                              {
                                    error1++;                                                    //??è?′í?ó ′í?ó±ê???ó1
                              }
                              for(i=0;i<UART2_Save_data_box_number;i++)
                              {
                                    UART2_Save_data_box=0;                                  //ò?μ??D??μ?êy?Y°üμ??22??òêy×é3?ê??ˉ
                              }
                              UART2_Save_data_box_pointer=1;                               //ò?μ??D??μ?êy?Y°üμ??22??ò??1
                     }





                     else if(UART2_Save_data_box_pointer>=23)                                                                                              //????D?μ?êy?Y′í?ó ?aê???0
                     {
                              for(i=0;i<UART2_Save_data_box_number;i++)
                              {
                                    UART2_Save_data_box=0;
                              }
                              UART2_Save_data_box_pointer=1;
                              error2++;                                                    //??è?′í?ó ′í?ó±ê???ó1
                     }



                     if(EPC_box_pointer>=EPC_number)
                     {
                              EPC_box_pointer=0;
                     }
            }



            else if(UART2_Save_data_box[0]==0x00)                                                             //è?1?é???êy?Y2?ê?êy?Y°üí·
            {
                     UART2_Save_data_box[0]=USART_ReceiveData(USART2);                //′￠′?êy?Yμ?UART2
            }
            else
            {
                     error3++;
                     UART2_Save_data_box[0]=USART_ReceiveData(USART2);                //′￠′?êy?Yμ?UART2
            }
            USART_ClearITPendingBit(USART2,USART_IT_RXNE);                                                                                  //??3y?D??±ê????
      }
}

error2 和 error3 都有错误但是error1一直为0 说明校验是成功的

串口接收中断里只做接收数据的缓存，处理拿到外面去做。

对于包内数据的判断应该是在完整的接收了一个数据包之后才做的

我的也是接收完了才做判断啊

我把处理数据的地方给注释掉了也一样

我重新贴一下代码

/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
** 函数名称: USART1_Send_Byte
** 功能描述: 串口发送一个字符串
** 参数描述：Data 要发送的数据
** 作　者: Dream
** 日　期: 2011年6月20日
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
void USART2_Send_Byte(uint16_t Data)
{
while(！USART_GetFlagStatus(USART2,USART_FLAG_TXE)); //USART_GetFlagStatus：得到发送状态位
//USART_FLAG_TXE:发送寄存器为空 1：为空；0：忙状态
USART_SendData(USART2,Data); //发送一个字符
}
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
** 函数名称: USART1_Send_Byte
** 功能描述: 串口发送一个字符串
** 参数描述：Data 要发送的数据
** 作　者: Dream
** 日　期: 2011年6月20日
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
uint8_t USART2_Receive_Byte(void)
{
while(！(USART_GetFlagStatus(USART2,USART_FLAG_RXNE))); //USART_GetFlagStatus：得到接收状态位
//USART_FLAG_RXNE:接收数据寄存器非空标志位
//1：忙状态 0：空闲(没收到数据，等待。)
return USART_ReceiveData(USART2); //接收一个字符
}
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
** 函数名称: Usart_Init
** 功能描述: 串口引脚初始化
** 参数描述: 无
** 作　者: Dream
** 日　期: 2011年6月20日
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
void Init_Usart2(void)
{
GPIO_InitTypeDef GPIO_InitStructure; //定义一个GPIO结构体变量
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO ,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 ,ENABLE);
//使能各个端口时钟，重要！
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //配置串口发送端口挂接到9端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用功能输出开漏
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //配置端口速度为50M
GPIO_Init(GPIOA, &GPIO_InitStructure); //根据参数初始化GPIOA寄存器
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //接收
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入(复位状态);
GPIO_Init(GPIOA, &GPIO_InitStructure); //根据参数初始化GPIOA寄存器
}
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
** 函数名称: Usart_Configuration
** 功能描述: 串口配置函数
** 参数描述: BaudRate设置波特率
** 作　者: Dream
** 日　期: 2011年6月20日
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
void Usart2_Configuration(uint32_t BaudRate)
{
USART_InitTypeDef USART_InitStructure; //定义一个串口结构体
USART_InitStructure.USART_BaudRate = BaudRate ; //波特率115200
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //传输过程中使用8位数据
USART_InitStructure.USART_StopBits = USART_StopBits_1; //在帧结尾传输1位停止位
USART_InitStructure.USART_Parity = USART_Parity_No ; //奇偶失能
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//硬件流失能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //接收和发送模式
USART_Init(USART2, &USART_InitStructure); //根据参数初始化串口寄存器
USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); //使能串口中断接收
USART_Cmd(USART2, ENABLE); //使能串口外设
}
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
** 函数名称: USART1_IRQHandler
** 功能描述: 串口中断函数
** 参数描述: 无
** 作　者: Dream
** 日　期: 2011年6月20日
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
void USART2_IRQHandler()
{
int i=0;
// u8 a=0;
extern u8 UART2_Save_data_box[UART2_Save_data_box_number]; //放置UART2接收到的字节需要溢出归0
extern u16 UART2_Save_data_box_pointer; //放置UART2接收到的字节盒子下一个数据放置的位置指向标志需要溢出归0
extern u32 EPC_box[EPC_number];
extern u16 EPC_box_pointer;
extern u8 back_correct;
extern u32 error1;
extern u32 error2;
extern u32 error3;
extern u32 EPC_count_l;
extern u32 EPC_count_h;
extern u32 timer1;
extern u8 zisuo3;
u8 a=0;
if(USART_GetITStatus(USART2, USART_IT_RXNE) ！= RESET) //读取接收中断标志位USART_IT_RXNE
//USART_FLAG_RXNE:接收数据寄存器非空标志位
//1：忙状态 0：空闲(没收到数据，等待。)
{/*
a=USART_ReceiveData(USART2);
if(a==0xBB)
{
UART2_Save_data_box[UART2_Save_data_box_pointer]=a; //继续存储数据
}
else if(
UART2_Save_data_box_pointer++;
if(UART2_Save_data_box_pointer>=UART2_Save_data_box_number)
{
UART2_Save_data_box_pointer=0;
} */
if(UART2_Save_data_box[0]==0xBB) //判断数据包头
{
UART2_Save_data_box[UART2_Save_data_box_pointer]=USART_ReceiveData(USART2); //继续存储数据
UART2_Save_data_box_pointer++;
if(UART2_Save_data_box[1]==0x98 && UART2_Save_data_box[5]==0x0D && UART2_Save_data_box[6]==0x0A) //判断数据包尾
{
for(i=1;i<4;i++) //计算校验值
{
a+=(u8)UART2_Save_data_box[i];
}
if(a==UART2_Save_data_box[4]) //校验成功
{
if(UART2_Save_data_box[3]==0x01)
{
back_correct=1;
OUT2_LED=0;
}
}
for(i=0;i<UART2_Save_data_box_number;i++)
{
UART2_Save_data_box[i]=0; //一旦判断到数据包的尾部则数组初始化
}
UART2_Save_data_box_pointer=1; //一旦判断到数据包的尾部则置1
}
else if(UART2_Save_data_box[1]==0x97 && UART2_Save_data_box[21]==0x0D && UART2_Save_data_box[22]==0x0A) //判断数据包尾
{
for(i=1;i<20;i++) //计算校验值
{
a+=(u8)UART2_Save_data_box[i];
}
if(a==UART2_Save_data_box[20]) //校验成功
{
for(i=0;i<3;i++)
{
EPC_box[EPC_box_pointer]=(UART2_Save_data_box[i*4+5]<<24)+(UART2_Save_data_box[i*4+1+5]<<16)+(UART2_Save_data_box[i*4+2+5]<<8)+(UART2_Save_data_box[i*4+3+5]<<0); //存储EPC
EPC_box_pointer++;
}
zisuo3=0;
OUT1_jingbao=1; //输出报警
timer1=0; //计时清0
EPC_count_l++; //标签总数+1
if(EPC_count_l>=1000000000)
{
EPC_count_l=0;
EPC_count_h++;
}
}
else
{
error1++; //偶然错误错误标志加1
}
for(i=0;i<UART2_Save_data_box_number;i++)
{
UART2_Save_data_box[i]=0; //一旦判断到数据包的尾部则数组初始化
}
UART2_Save_data_box_pointer=1; //一旦判断到数据包的尾部则置1
}
else if(UART2_Save_data_box_pointer>=UART2_Save_data_box_number) //偶尔性的数据错误开始清0
{
for(i=0;i<UART2_Save_data_box_number;i++)
{
UART2_Save_data_box[i]=0;
}
UART2_Save_data_box_pointer=1;
error2++; //偶然错误错误标志加1
}
if(EPC_box_pointer>=EPC_number)
{
EPC_box_pointer=0;
}
}
else if(UART2_Save_data_box[0]==0x00) //如果上个数据不是数据包头
{
UART2_Save_data_box[0]=USART_ReceiveData(USART2); //储存数据到UART2
&n

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