title: How do I continuously send and receive with wireless serial-port in 8051?
body: <p>I'm trying to make a microcontroller communicate with a program on my desktop. I'm using serial port connections with Xbee radios on both ends. </p>
  
  <p>The communication works fine when I send something from the microcontroller to the desktop and the program on the desktop then sends something back to the microcontroller. </p>
  
  <p>However, when I require the information to be sent from the controller to the desktop program continuously until the desktop program sends a particular answer it doesn't work. </p>
  
  <p>Here's the code for what I'm talking about:</p>
  
  <pre><code>    unsigned char ans = 'N';
      unsigned int count = 0;
  
      void main(void)
      {
  
  
          while(1)
          {
              if(count == 0)
              {
                  Configure();
                  count = 1;
              }
  
                    //there is some more code here but is irrelevant to the serial communication
  
           }
  
      }
  
  
  void Configure()
  {
  
  
      //Repeat this until the user accepts the sent string as correct
      while(ans == 'N')
      {
  
          BuildString();
          Send();
          Receive();
      }
  }
  
  void Send()
  {
      unsigned int i;
  
      TMOD = 0x20;
      TH1 = 0xFD;
      SCON = 0x50;
      TR1 = 1;
  
      for(i=0; i&lt;4; i++)
      {
          SBUF = toSend[i];
          while(TI == 0);
          TI = 0;
      }   
  
  }
  
  void Receive()
  {
      unsigned int j;
  
      TMOD = 0x20;
      TH1 = 0xFD;
      SCON = 0x50;
      TR1 = 1;
  
  
      for(j=0; j&lt;2; j++)
      {
          while(RI == 0);
          Received[j] = SBUF;
          RI = 0; 
      }
  
  
      if(count == 0)
          ans = Received[1];
  
      else
      {   
          RunType = Received[0];
          Move = Received[1];
      }
  
  
  }
  </code></pre>
  
  <p>The BuildString() function simply constructs a string on the basis of some sensor inputs. 
  The send and receive functions work fine usually but when I need them to send and receive continuously, like in the Configure() function above, it doesn't work. </p>
  
  <p>Any suggestions? I'd really appreciate them.</p>