def pv_callback_step(self, pvname=None, value=None, char_value=None, **kw):
"""Callback function that is called by pyEpics when certain EPICS PVs are changed
"""
log.debug('pv_callback_step pvName=%s, value=%s, char_value=%s',
pvname, value, char_value)
if (pvname.find('StartEnergyChange') != -1) and (value == 1):
self.energy_change()
def _compute_senses(self):
'''Computes whether this motion will be increasing or decreasing encoder counts.
user direction, overall sense.
'''
# Encoder direction compared to dial coordinates
encoder_dir = 1 if self.epics_pvs['PSOCountsPerRotation'].get(
) > 0 else -1
# Get motor direction (dial vs. user); convert (0,1) = (pos, neg) to (1, -1)
motor_dir = 1 if self.epics_pvs['RotationDirection'].get() == 0 else -1
# Figure out whether motion is in positive or negative direction in user coordinates
user_direction = 1 if self.rotation_stop > self.rotation_start else -1
# Figure out overall sense: +1 if motion in + encoder direction, -1 otherwise
log.debug((encoder_dir, motor_dir, user_direction))
return user_direction * motor_dir * encoder_dir, user_direction
def pv_callback(self, pvname=None, value=None, char_value=None, **kw):
"""Callback function that is called by pyEpics when certain EPICS PVs are changed
The PVs that are handled are:
- ``StartScan`` : Calls ``run_fly_scan()``
- ``AbortScan`` : Calls ``abort_scan()``
- ``MoveSampleIn`` : Runs ``MoveSampleIn()`` in a new thread.
- ``MoveSampleOut`` : Runs ``MoveSampleOut()`` in a new thread.
- ``ExposureTime`` : Runs ``set_exposure_time()`` in a new thread.
- ``FilePath`` : Runs ``copy_file_path`` in a new thread.
- ``FPFilePathExists`` : Runs ``copy_file_path_exists`` in a new thread.
- ``FPWriteStatus``: Runs ``abort_scan()``
"""
log.debug('pv_callback pvName=%s, value=%s, char_value=%s', pvname, value, char_value)
if (pvname.find('MoveSampleIn') != -1) and (value == 1):
thread = threading.Thread(target=self.move_sample_in, args=())
thread.start()
elif (pvname.find('MoveSampleOut') != -1) and (value == 1):
thread = threading.Thread(target=self.move_sample_out, args=())
thread.start()
elif pvname.find('ExposureTime') != -1:
thread = threading.Thread(target=self.set_exposure_time, args=(value,))
thread.start()
elif pvname.find('FilePathExists') != -1:
thread = threading.Thread(target=self.copy_file_path_exists, args=())
thread.start()
elif pvname.find('FilePath') != -1:
thread = threading.Thread(target=self.copy_file_path, args=())
thread.start()
elif (pvname.find('StartScan') != -1) and (value == 1):
self.run_fly_scan()
elif (pvname.find('AbortScan') != -1) and (value == 1):
self.abort_scan()
elif (pvname.find('WriteStatus') != -1) and (value == 1):
self.abort_scan()