class BarcodeReader(DeviceBase):

    def doInitialize(self):
        self.disable()
        
    def enable(self):
        microscan_cmd.write("<H>")
        self.setState(State.Ready)
    
    def disable(self):    
        microscan_cmd.write("<I>")
        self.setState(State.Disabled)
    
    def get(self,timeout=1.0):    
        self.state.assertReady()
        try:
            self.setState(State.Busy)
            ret =  microscan.waitString(int(timeout * 1000))    
            self.setCache(ret, None)
            return ret
        except:
            self.setCache(None, None)
            return None
        finally:
            self.setState(State.Ready)

    def doUpdate(self):
        self.get()


    def read(self,timeout=1.0):    
        initial = self.state
        if initial == State.Disabled:
            self.enable()
        try:
            return self.get()
        finally:
            if initial == State.Disabled:
                self.disable()
            
        
    


add_device(BarcodeReader("barcode_reader"), force = True)