Re-arms the analog output according to current settings

        :param trigger: name of the trigger terminal. ``None`` value means generation begins immediately on run
        :type trigger: str

def reset_generation(self, trigger):
        """Re-arms the analog output according to current settings

        :param trigger: name of the trigger terminal. ``None`` value means generation begins immediately on run
        :type trigger: str
        """
        self.tone_lock.acquire()

        npts =  self.stim.size
        try:
            self.aotask = AOTaskFinite(self.aochan, self.fs, npts, trigsrc=trigger)
            self.aotask.write(self.stim)
            if self.attenuator is not None:
                self.attenuator.SetAtten(self.atten)
            else:
                # print "ERROR: attenuation not set!"
                pass
                # raise

            self.ngenerated +=1
            if self.stim_changed:
                new_gen = self.stim
            else:
                new_gen = None
            self.stim_changed = False

        except:
            print u'ERROR! TERMINATE!'
            self.tone_lock.release()
            raise

        self.tone_lock.release()
        return new_gen