def startLoop(self):
first = True<EOL>self._looping = True<EOL>while self._looping:<EOL><INDENT>if first:<EOL><INDENT>self._proxy.setBusy(False)<EOL>first = False<EOL><DEDENT>time.sleep(<NUM_LIT:0.5>)<EOL><DEDENT>
Starts a blocking run loop in which driver callbacks are properly
invoked.

@precondition: There was no previous successful call to L{startLoop}
    without an intervening call to L{stopLoop}.