def monitor_start(self, monitor_append=False):
"""
Start a monitoring process on the PV channel.
Parameters
----------
monitor_apppend : bool, optional
The choice of storing all updated values in a list, or simply
overwriting the value attribute each time. This will change the
:attr:`.monitor_append` attribute
"""
if not self.isinitialized:
if self.isconnected:
self.get_data(self.control, -1.0, self.count)
pyca.flush_io()
else:
self.do_initialize = True
self.connect()
self.wait_ready()
if self.ismonitored:
if monitor_append == self.monitor_append:
return
if monitor_append:
self.monitor_clear()
self.monitor_append = monitor_append
return
self.monitor_append = monitor_append
self.monitor_clear()
self.monitor()
pyca.flush_io()
def _linkEPICSPV(self):
''' Connect PVs to monitoring changes:
runPv, failUDPv, failLDPv, nshotsPv, evrDlyPv
'''
ppPvs = [
self.runPv, self.failUDPv, self.failLDPv, self.nshotsPv,
self.evrDlyPv
]
self._connectEPICSPV()
if None in ppPvs:
self.ims_on = False
return False
self._pr_log('Connecting EPICS Monitors -----')
evtmask = pyca.DBE_VALUE
# monitor run status
self.runPv.monitor_cb = self._runPvCallback
self.runPv.monitor(evtmask)
# monitor upper bounds status
self.failUDPv.monitor_cb = self._failUDPvCallback
self.failUDPv.monitor(evtmask)
# monitor lower bounds status
self.failLDPv.monitor_cb = self._failLDPvCallback
self.failLDPv.monitor(evtmask)
# monitor number of shots
self.nshotsPv.monitor_cb = self._nshotsPvCallback
self.nshotsPv.monitor(evtmask)
# monitor EVR delay value
self.evrDlyPv.monitor_cb = self._evrDlyPvCallback
self.evrDlyPv.monitor(evtmask)
self.ims_on = True
pyca.flush_io()
return True
def some_thread_thing(pvname):
pyca.attach_context()
pv = setup_pv(pvname)
pv.get_data(False, -1.0)
pyca.flush_io()
assert pv.getevt_cb.wait(timeout=1)
assert isinstance(pv.data['value'], tuple)
def getSelection(self, selected, deselected):
try:
row = selected.indexes()[0].row()
ioc = self.model.data(self.model.index(row, MyModel.IOCNAME),
QtCore.Qt.EditRole).value()
host = self.model.data(self.model.index(row, MyModel.HOST),
QtCore.Qt.EditRole).value()
if ioc == self.currentIOC:
return
self.disconnectPVs()
self.currentIOC = ioc
self.ui.IOCname.setText(ioc)
base = utils.getBaseName(ioc)
self.currentBase = base
if base != None:
self.dopv(base + ":HEARTBEAT", self.ui.heartbeat, "%d")
self.dopv(base + ":TOD", self.ui.tod, "%s")
self.dopv(base + ":STARTTOD", self.ui.boottime, "%s")
pyca.flush_io()
d = utils.netconfig(host)
try:
self.ui.location.setText(d['location'])
except:
self.ui.location.setText("")
try:
self.ui.description.setText(d['description'])
except:
self.ui.description.setText("")
except:
pass
def test_subscribe(pvname):
logger.debug('test_subscribe %s', pvname)
pv = setup_pv(pvname)
ev = threading.Event()
def mon_cb(exception=None):
logger.debug('monitor_cb in %s, exception=%s', pvname, exception)
if exception is None:
ev.set()
pv.monitor_cb = mon_cb
pv.subscribe_channel(pyca.DBE_VALUE | pyca.DBE_LOG | pyca.DBE_ALARM, False)
# Repeat the put/get test without the get
pv.get_data(False, -1.0)
pyca.flush_io()
assert pv.getevt_cb.wait(timeout=1)
old_value = pv.data['value']
pv_type = type(old_value)
logger.debug('%s is of type %s', pvname, pv_type)
if pv_type in (int, long, float):
new_value = old_value + 1
elif pv_type == str:
new_value = "putmon"
elif pv_type == tuple:
new_value = tuple([1] * len(old_value))
logger.debug('caput %s %s', pvname, new_value)
ev.clear()
pv.put_data(new_value, 1.0)
assert ev.wait(timeout=1)
recv_value = pv.data['value']
assert recv_value == new_value
def __connection_handler(self, isconnected):
"""
Called by Channel Access when connection state changes
"""
self.isconnected = isconnected
if isconnected:
self.__con_sem.set()
else:
self.__con_sem.clear()
if self.do_initialize:
self.get_data(self.control, -1.0, self.count)
pyca.flush_io()
if self.count is None:
try:
self.count = super(Pv, self).count()
except:
pass
for (id, cb) in self.con_cbs.items():
try:
cb(isconnected)
except Exception:
logprint("Exception in connection callback for {}:".format(self.name))
traceback.print_exc()
def connect(self):
Pv.connect(self, timeout=1.0)
self.connected = True
# self.monitor_cb = self.changed
evtmask = pyca.DBE_VALUE | pyca.DBE_LOG | pyca.DBE_ALARM
self.monitor(evtmask)
pyca.flush_io()
def _disconnectPv(self, pv):
if pv != None:
try:
pv.disconnect()
pyca.flush_io()
except:
pass
return None
def _ensure_monitored(self):
"""
Make sure PV has been initialized and monitored
"""
self.get()
if not self.ismonitored:
self.monitor()
pyca.flush_io()
def __getevt_callback(pv, e=None):
if pv.handler:
pv.handler(pv, e)
if e is None:
pv._Pv__getevt_handler(e)
pv.getevt_cb = None
pv.monitor(pyca.DBE_VALUE)
pyca.flush_io()
def monitor_start(self):
""" start monitoring for the Pv, new values are added to the `values`
list """
evtmask = pyca.DBE_VALUE | pyca.DBE_LOG | pyca.DBE_ALARM
self.monitor(evtmask, ctrl=False)
self.ismonitored = True
pyca.flush_io()
# self.values=[]
if (is_debug_on()): logprint("start monitoring for %s" % self.name)
def set_naverage(self,nimage,timeout=300) :
"""
Set number of images for averaging
"""
try:
self.__navgimage_pv.put(nimage,timeout)
pyca.flush_io()
except pyca.pyexc, e:
print "ERROR: Failed to set naverage:",e
raise
def get_naverage(self,timeout=300) :
"""
Get number of images for average
"""
try:
self.__navgimage_pv.get(timeout=timeout)
pyca.flush_io()
return self.__navgimage_pv.value
except pyca.pyexc, e:
print "ERROR: Failed to get naverage:",e
raise
def energy(self, timeout=1.0):
"""
Get gas detector energy (mJ)
"""
try:
self.__energy_pv.get(timeout=timeout)
pyca.flush_io()
return self.__energy_pv.value
except pyca.pyexc, e:
print "ERROR: Failed to get gas-detector energy:", e
raise
def close(self):
self.__logger.info("Close shutter")
if self.isClose():
self.__logger.info("shutter already closed")
else:
self.__logger.info("Set %s to %0.1f" %
(self.__ctrl.name, self.__close_val))
self.__state_change.clear()
self.__ctrl.put(self.__close_val)
pyca.flush_io()
def open(self):
self.__logger.info("Open shutter")
if self.isOpen():
self.__logger.info("shuttter already opened")
else:
self.__logger.info("Set %s to %0.1f" %
(self.__ctrl.name, self.__open_val))
self.__state_change.clear()
self.__ctrl.put(self.__open_val)
pyca.flush_io()
def apply(self, idx):
d = self.getObj(idx)
pvd = self.pvdict[idx]
for s in param.params.pobj.setflds:
for f in s:
fm = param.params.pobj.fldmap[f]
if fm['readonly']:
continue
if fm['writezero']:
try:
v = d[f] # PV value
except:
continue
v2 = self.getCfg(idx, f) # Configured value
#
# Write a value if:
# 1. It's not derived (the value isn't None), and either
# 2a. It's a change, or
# 2b. It's a "must write" value.
#
if v2 != None and (not param.equal(v, v2) or fm['mustwrite']):
try:
z = fm['enum'][0]
except:
z = 0
try:
pv = pvd[f]
if param.params.debug:
print("Put %s to %s" % (str(z), pv.name))
else:
pv.put(z, timeout=-1.0)
except:
pass
pyca.flush_io()
for f in s:
fm = param.params.pobj.fldmap[f]
if fm['readonly']:
continue
try:
v = d[f] # PV value
except:
continue
v2 = self.getCfg(idx, f) # Configured value
if v2 != None and (not param.equal(v, v2) or fm['mustwrite']):
try:
pv = pvd[f]
if param.params.debug:
print("Put %s to %s" % (str(v2), pv.name))
else:
pv.put(v2, timeout=-1.0)
except:
pass
pyca.flush_io()
def mv(self,position,timeout=-1.0) :
"""
Move motor to position
"""
self.__logger.info("%s Move motor to %0.6f"%(self.__basepv,position))
try:
self.__val.put(position,timeout)
pyca.flush_io()
self.__motion_done.clear()
except pyca.pyexc, e:
self.__logger.error("%s Failed to move motor"%self.__basepv)
raise
def monitor_start(self, monitor_append=False):
""" start monitoring for the Pv, new values are added to the `values`
list """
if (self.ismonitored and self.monitor_append == monitor_append): return
if (self.ismonitored and self.monitor_append != monitor_append):
self.monitor_stop()
self.monitor_append = monitor_append
evtmask = pyca.DBE_VALUE | pyca.DBE_LOG | pyca.DBE_ALARM
self.monitor(evtmask, ctrl=False)
self.ismonitored = True
pyca.flush_io()
self.values = []
if (is_debug_on()): logprint("start monitoring for %s" % self.name)
def __getevt_handler(self, e=None):
"""
Called when data is requested over the Channel
"""
if e == None:
self.isinitialized = True
self.do_initialize = False
self.getevt_cb = None
if self.do_monitor:
self.monitor(pyca.DBE_VALUE | pyca.DBE_LOG | pyca.DBE_ALARM,
self.control, self.count)
pyca.flush_io()
self.__init_sem.set()
def mvr(self,nudge,timeout=-1.0) :
"""
Nudge motor position by value nudge
"""
self.__logger.info("%s Nudge motor by %0.6f"%(self.__basepv,nudge))
try:
self.__twv.put(nudge,timeout)
self.__twf.put(1,timeout)
pyca.flush_io()
self.__motion_done.clear()
except pyca.pyexc, e:
self.__logger.error("%s Failed to nudge motor"%self.__basepv)
raise
def update_follower(self, exception=None):
print "Update follower"
print self.__pvmonitor.name, "updated"
# Get monitor value
print "Getting", self.__pvmonitor.name, "latest value"
self.__pvmonitor.get()
# Calculate new value for follower
new_value = self.__follower_func(self.__pvmonitor.value)
# Set new value for follower
print self.__pvfollower.name, new_value
self.__pvfollower.put(new_value)
pyca.flush_io()
def put(self, value, timeout=None) :
"""
EPICS PUT - Set EPICS PV and wait until complete or timeout
"""
# Put EPICS data
super(epics_PV,self).put_data(value,-1.0)
pyca.flush_io()
# Wait for EPICS call to complete
self.__put_done.clear()
self.__put_done.wait(timeout)
if not self.__put_done.isSet():
self.__logger.warning("%s EPICS PUT timedout after %d seconds"%(self.name,timeout))
raise
def __start_monitors(self):
"""
Start EPICS monitors of rbv PV to continously update shutter state
"""
self.__logger.debug("Starting monitor for %s" % self.__rbv.name)
# Connect to monitor callbacks
self.__rbv.monitor_cb = self.__rbv_cb
# Start monitor
pvevt = pyca.DBE_ALARM | pyca.DBE_LOG | pyca.DBE_VALUE
self.__rbv.monitor(pvevt)
pyca.flush_io()
# Wait 1 second for monitoring to start
time.sleep(1.0)
def put(self, value, timeout = DEFAULT_TIMEOUT, **kw):
"""
Set the PV value
If the PV has not been previously connected, this will automatically
attempt to use :meth:`.connect`.
Parameters
----------
value : float, int, str or array
Desired PV value
timeout : float or None, optional
Time to wait for put to be completed. If None, no timeout is used
Returns
-------
value : float, int, str, or array
The value given to the PV
TODO : Add a put_complete which confirms the success of the function
"""
if DEBUG != 0:
logprint("caput %s in %s\n" % (value, self.name))
if timeout:
try:
tmo = float(timeout)
except ValueError:
tmo = DEFAULT_TIMEOUT
else:
tmo = -1.0
if not self.isinitialized:
if self.isconnected:
self.get_data(self.control, -1.0, self.count)
pyca.flush_io()
else:
self.do_initialize = True
self.connect()
self.wait_ready(DEFAULT_TIMEOUT * 2)
with utils.TimeoutSem(self.__pyca_sem, tmo):
self.put_data(value, tmo)
return value
def get(self, ctrl=False, timeout=None) :
"""
EPICS GET - waits for EPICS to return data or will timeout
"""
self.__logger.debug("%s EPICS GET"%self.name)
# Get EPICS data
super(epics_PV,self).get(ctrl,-1.0)
pyca.flush_io()
# Wait for EPICS call to complete
self.__get_done.clear()
self.__get_done.wait(timeout)
if not self.__get_done.isSet():
self.__logger.warning("%s EPICS GET timedout after %d seconds"%(self.name,timeout))
raise
def set(self, value):
"""
Set FEL Energy
"""
self.__logger.info("Set FEL Energy to %f" % value)
# Check current value
self.__ctrl.get(timeout=1.0)
pyca.flush_io()
if self.__ctrl.value == value:
self.__logger.info("FEL already at %f" % value)
self.__done.set()
else:
self.__done.clear()
self.__ctrl.put(value)
pyca.flush_io()
def test_get_data(pvname):
logger.debug('test_get_data %s', pvname)
pv = setup_pv(pvname)
# get time vars
pv.get_data(False, -1.0)
pyca.flush_io()
assert pv.getevt_cb.wait(timeout=1)
pv.getevt_cb.reset()
# get ctrl vars
pv.get_data(True, -1.0)
pyca.flush_io()
assert pv.getevt_cb.wait(timeout=1)
# check that the data has all the keys
all_keys = ('status', 'value', 'secs', 'nsec')
for key in all_keys:
assert key in pv.data
# check that value is not None
assert pv.data['value'] is not None
def wait_ready(self, timeout=None):
"""
Wait for the PV to be initialized
Parameters
----------
timeout : float or None, optional
Maximum time to wait to hear a response
Raises
------
pyca.pyexc
If timeout is exceeded
"""
pyca.flush_io()
self.__init_sem.wait(timeout)
if not self.__init_sem.isSet():
raise pyca.pyexc, "ready timedout for PV %s" %(self.name)
def start_dropshot_counting(self, threshold=0.0):
"""
Monitor gasdet energy value and count number of dropped shots,
defined as number of below threshold readings
"""
# Set threshold
self.__threshold = threshold
# Set up monitor call back for gas-detector energy reading
self.__energy_pv.monitor_cb = self.__energy_cb
print "Counting dropshot [thereshold=", self.__threshold, "]"
# Reset internal dropped shot counter and start monitoring
self.__dropped_shot = 0
pvevt = pyca.DBE_ALARM | pyca.DBE_LOG | pyca.DBE_VALUE
self.__energy_pv.monitor(pvevt)
pyca.flush_io()
def connected_cb(self, isconnected):
"""
Callback to run whenever the connection state of our pv changes.
:param isconnected: True if we are connected, False otherwise.
:type isconnected: bool
"""
self.connected = isconnected
self.send_connection_state(isconnected)
if isconnected:
self.epics_type = self.pv.type()
self.count = self.pv.count or 1
# Get the control info for the PV.
self.pv.get_data(True, -1.0, self.count)
pyca.flush_io()
if self.epics_type == "DBF_ENUM":
self.pv.get_enum_strings(-1.0)
if not self.pv.ismonitored:
self.pv.monitor()
self.python_type = type_map.get(self.epics_type)
if self.python_type is None:
raise Exception("Unsupported EPICS type {0} for pv {1}".format(
self.epics_type, self.pv.name))
