简单协议解析

 INTERRUPT_HANDLER(UART1_RX_IRQHandler, 18)
 {
    /* In order to detect unexpected events during development,
       it is recommended to set a breakpoint on the following instruction.
    */
   u8 RX_Data;
    if(UART1_GetITStatus(UART1_IT_RXNE )!= RESET)  
    {
      /*接收中断*/
     RX_Data =UART1_ReceiveData8();
     if(Rs485_Rx_Finished_Flag==0)
     {
        if(UART1_RX_Count == 0)
        {
          if(RX_Data == 0xFF)
          {
              UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
          }
          else
          {
              UART1_RX_Count = 0;
              Checksum = 0;
          }
        }
        else if(UART1_RX_Count == 1)
        {
          if(RX_Data == 0xFF)
          {
               UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
          }
          else
          {
               UART1_RX_Count = 0;
               Checksum = 0;
          }
        }
        else if(UART1_RX_Count == 2)		//模块类型
        {
          if((RX_Data == Module_type_485)||(RX_Data == Module_type_EQ1)||(RX_Data == Module_type_EQ2))
          {
                  UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
                  Checksum += RX_Data;
          }
          else
          {
                  UART1_RX_Count = 0;
                  
                  Checksum = 0;
          }
        }
        else if(UART1_RX_Count == 3)		//ID号
        {
          if((RX_Data == Module_ID)||(RX_Data == 0xFE))
          {
                  UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
                  Checksum += RX_Data;
          }
          else
          {
                  UART1_RX_Count = 0;
                  Checksum = 0;
          }			
        }
        else if(UART1_RX_Count == 4)		//长度=数据长度N+2，整包长度= 长度+5。
        {
            UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
            Length_Rx_485 = RX_Data;
            Checksum += RX_Data;			
        }		
        else if(UART1_RX_Count == 5)		//指令，PING：0x01，READ DATA：0x02，WRITE DATA：0x03，REG WRITE：0x04，ACTION：0x05，RESET：0x06，SYNC WRITE：0x07。
        {
            if((RX_Data == PING)||(RX_Data == READ_DATA)||(RX_Data == WRITE_DATA)||(RX_Data == REG_WRITE)||(RX_Data == ACTION)||(RX_Data == RESET)||(RX_Data == SYNC_WRITE))
            {
                    UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
                    Checksum += RX_Data;
            }
            else
            {
                    UART1_RX_Count = 0;
                    Checksum = 0;
            }
        } 
        else
        {
            UART1_RX_Buffer[UART1_RX_Count++] = RX_Data;
            if(UART1_RX_Count<(Length_Rx_485 + 5))
            {
              Checksum += RX_Data;
            }
            
            else if(UART1_RX_Count >= (Length_Rx_485 + 5))
            {
              if((255-Checksum) == RX_Data)
              {
                  UART1_RX_Count = 0;
                  Length_Rx_485 = 0;
                  Checksum = 0;
                  Rs485_Rx_Finished_Flag = 1;
                  return;
              }
              else
              {
                  UART1_RX_Count = 0;
                  Length_Rx_485 = 0;                 
                  Checksum = 0;
                  Rs485_Rx_Finished_Flag = 0;
                  return;					
              }
            } 
        }
     }
    }
 }