def __init__(self, name, pvroot, temp_tolerance, stable_time_sec=0, stop_sets_setpoint_to_readback=False):
self.name = name
self.itc = CryojetController(pvroot)
self.temp_tolerance = temp_tolerance
self.stable_time_sec = stable_time_sec
self.stop_sets_setpoint_to_readback = stop_sets_setpoint_to_readback
self.setpoint = 0
self.stable = True
self.verbose = False
self.hold_timer = self._timer_factory()
self.inputNames = [name]
self.extraNames = ['sensor_temp']
self.outputFormat = ['%f', '%f']
class CryojetScannable(ScannableMotionBase):
"""CryojetScannable:
`pos scn` returns setpoint and current sensor temperature
`pos scn X` sets a new setpoint and returns it and the final sensor reading
Extensions:
`scn.temp_tolerance=X` is the allowable temperature deviation from the setpoint
`scn.stable_time_sec=X` is the time it needs to be in tolerance for, 0 by default
`scn.verbose=True` prints out extra debugging info (at 10Hz) defaults to False"""
def __init__(self, name, pvroot, temp_tolerance, stable_time_sec=0, stop_sets_setpoint_to_readback=False):
self.name = name
self.itc = CryojetController(pvroot)
self.temp_tolerance = temp_tolerance
self.stable_time_sec = stable_time_sec
self.stop_sets_setpoint_to_readback = stop_sets_setpoint_to_readback
self.setpoint = 0
self.stable = True
self.verbose = False
self.hold_timer = self._timer_factory()
self.inputNames = [name]
self.extraNames = ['sensor_temp']
self.outputFormat = ['%f', '%f']
def __repr__(self):
return "CryojetScannable(name=%r, pvroot=%r, temp_tolerance=%r, stable_time_sec=%r)" % (
self.name, self.itc.pvs.pvroot, self.temp_tolerance, self.stable_time_sec)
def __str__(self):
return "setpoint=%f, sensor=%f" % self.getPosition()
def _timer_factory(self):
return Timer(self.stable_time_sec, self._timer_completed)
def _timer_completed(self):
self.stable = True
if self.verbose:
print "CryojetScannable: Hold timer finished..."
def getPosition(self):
return (self.itc.getTempSetPoint(),
self.itc.getTempSensor())
def rawAsynchronousMoveTo(self,setpoint):
if self.verbose:
print "CryojetScannable: Moving to %r" % setpoint
self.setpoint = setpoint
self.itc.setTempSetPoint(setpoint)
self.stable = False
self.hold_timer.cancel()
def stop(self):
if self.stop_sets_setpoint_to_readback:
self.rawAsynchronousMoveTo(self.itc.getTempSensor())
self.stable = True
if self.verbose:
print "CryojetScannable: Stopped"
def isBusy(self):
# Note that we rely on isBusy being called often enough that the
# hold_timer will be cancelled before it triggers if the temperature
# goes out of range before the end of the hold timer. Only when the
# temperature is stable will this scannable stop being busy.
if not self.stable:
dtemp = self.setpoint - self.itc.getTempSensor()
if abs(dtemp) > self.temp_tolerance:
self.hold_timer.cancel()
if self.verbose:
print "CryojetScannable: temperature differential %f greater than %f from %f" % (dtemp, self.temp_tolerance, self.setpoint)
elif not self.hold_timer.isAlive():
self.hold_timer = self._timer_factory()
self.hold_timer.start()
if self.verbose:
print "CryojetScannable: Hold timer started..."
else:
if self.verbose:
print "CryojetScannable: Holding..."
return True
if self.verbose:
print "CryojetScannable: No longer busy"
return False
