Refresh widget

[Arepi]

I try port reading and displaying in widgets.Well, I try to demostrate the problem during the next simplified example:

 1. use Win32::SerialPort 0.09;
   2. use Tk;
   3.  
   4. $mw=MainWindow->new();
   5.  
   6. $mw->maxsize(600,470);
   7. $mw->minsize(600,470);
   8.  
   9. ########################### widgets #######################x
  10. $d1=0.000;
  11. $e1=$mw->Entry(-width => 10,
  12. -textvariable => \$d1); #here iwant display the data from port
  13. $e1->place(-x =>100, -y =>100);
  14.  
  15.  
  16. $g2 = $mw->Button(-text => "Start read",
  17. -command => sub{ &read} #here i start the first read
  18. );
  19. $g2->place(-x => 240, -y => 100);
  20. ######################### Port Object#########################
  21. unless ($soros_port = Win32::SerialPort->new ('com1')) {
  22. printf "Nem tudtam megnyitni a soros portot!\n";
  23. exit 1;
  24.  
  25. $soros_port->baudrate(9600) || die "rossz BAUD";
  26. $soros_port->parity('even') || die "rossz Parias";
  27. $soros_port->databits(8) || die "rossz Adatbit";
  28. $soros_port->stopbits(1) || die "rossz Stopbit";
  29. $soros_port->buffers(4096,4096) || die "rossz Buffer";
  30. $soros_port->handshake("none") || die "rossz Handshake";
  31. ################################################## ########
  32. MainLoop();
  33.  
  34. sub read #the function go back whit the data freshing the $e1 widgets
  35. {
  36. while(1)
  37. {
  38. ($count_in, $d1) = $soros_port->read(1) or die "itten";
  39. if($count_in!=0) {last;}
  40. }
  41. }
  42. ################################################## #########

How can after the return of " sub read" (so refreshing the widget)
fast and automatically call the "sub read" again and again?->so can I continous displaying the data from port (the repeat are to slow->1ms)

[Icecrack]

i will have to try your code when i get home from work, as i do not have the equipment here to do it.