串口接收数据，神奇的错误？？？

只看该作者 · 2013-5-16 18:50

本帖最后由 cnyg 于 2013-5-17 11:08 编辑



程序出错源码：
问题用PC发送N段数据（中间延时不定），第一次接收正确，以后每次只能接收到0xFD其余为0X00，
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
      {
            temp = USART_ReceiveData(USART2);
            Usart2_Receive_Counter++;
         if( Usart2_Receive_mode == FLAG_DATA )
                        {
                              if ( Usart2_Work_mode == STAT_IDLE )
                              {
                                    if (temp == 0xfd)
                                    {
                                             Usart2_numlength = 0;
                                             Usart2_RX_DATA[Usart2_Amount][Usart2_numlength++] = temp;
                                             Usart2_Work_mode = STAT_RECEIVE;                //正确接收到返回的起始字 0xFD
                                    }
                              } else if (Usart2_Work_mode == STAT_RECEIVE)
                        {
                                    if( Usart2_numlength == DATA_SIZE )
                                    {
                                             memset(&Usart2_RX_DATA[Usart2_Amount],0,DATA_SIZE);
                                             Usart2_Work_mode = STAT_IDLE;
                                    }else
                                    {
                                             Usart2_RX_DATA[Usart2_Amount][Usart2_numlength++] = temp;
                                             if (Usart2_numlength == Usart2_RX_DATA[Usart2_Amount][1] + 7)
                                             {
                                                            Usart2_Work_mode = STAT_IDLE;
                                                            Usart2_Receive_OK = STAT_OK;
                                                            Usart2_RX_DATA[Usart2_Amount][39]=STAT_OK;
                                                            Usart2_Amount++;
                                                            if(Usart2_Amount == DATA_AMOUNT)
                                                               Usart2_Amount=0;
                                             }
                                    }
                              }
                     }else Usart2_RX_CMD[Usart2_numlength++] = temp;

但是如果代码改为这个接收就正常了？？？？？？？？
难道程序能够影响串口接收？？？？？？？？？
      if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
      {
            temp = USART_ReceiveData(USART2);
            Usart2_Receive_Counter++;
            Usart2_RX_CMD[Usart2_numlength++] = temp;
//          if( Usart2_Receive_mode == FLAG_DATA )
//                         {
//                               if ( Usart2_Work_mode == STAT_IDLE )
//                               {
//                                     if (temp == 0xfd)
//                                     {
//                                              Usart2_numlength = 0;
//                                              //memset(Usart1_RX_DATA[Usart1_Amount][],0,40);
//                                              Usart2_RX_DATA[Usart2_Amount][Usart2_numlength++] = temp;
//                                              Usart2_Work_mode = STAT_RECEIVE;                //正确接收到返回的起始字 0xFD
//                                     }
//                               } else if (Usart2_Work_mode == STAT_RECEIVE)
//                         {
//                                     if( Usart2_numlength == DATA_SIZE )
//                                     {
//                                              memset(&Usart2_RX_DATA[Usart2_Amount],0,DATA_SIZE);
//                                              Usart2_Work_mode = STAT_IDLE;
//                                     }else
//                                     {
//                                              Usart2_RX_DATA[Usart2_Amount][Usart2_numlength++] = temp;
//                                              if (Usart2_numlength == Usart2_RX_DATA[Usart2_Amount][1] + 7)
//                                              {
//                                                             Usart2_Work_mode = STAT_IDLE;
//                                                             Usart2_Receive_OK = STAT_OK;
//                                                             Usart2_RX_DATA[Usart2_Amount][39]=STAT_OK;
//                                                             Usart2_Amount++;
//                                                             if(Usart2_Amount == DATA_AMOUNT)
//                                                                Usart2_Amount=0;
//                                              }
//                                     }
//                               }
//                      }else Usart2_RX_CMD[Usart2_numlength++] = temp;