def set_pv_value(self, name, value, wait=False, timeout=TIMEOUT):
"""Set the PV to a value.
When getting a PV value this call should be used, unless there is a special requirement.
Parameters:
name - the PV name
value - the value to set
wait - wait for the value to be set before returning
"""
name = MYPVPREFIX + ':' + name
if name not in CACHE.keys():
chan = CaChannel(name)
chan.setTimeout(TIMEOUT)
#Try to connect - throws if cannot
chan.searchw()
CACHE[name] = chan
else:
chan = CACHE[name]
if wait:
chan.putw(value)
else:
def putCB(epics_args, user_args):
#Do nothing in the callback
pass
ftype = chan.field_type()
ecount = chan.element_count()
chan.array_put_callback(value, ftype, ecount, putCB)
chan.flush_io()
def reset(self):
print ('================= RESET EPICS WAVE SETUP ===============')
from CaChannel import CaChannel
wavex = CaChannel()
wavey = CaChannel()
for chan in range(1, 3):
if getattr(self, 'wave_%d' % (chan)).isOn():
try:
pv_wave_x = getattr(self, 'wave_%d_pv_x' % (chan)).data()
wavex.searchw(pv_wave_x)
except:
msg = 'Error on PV waveform %d x variable' % (chan)
Data.execute('DevLogErr($1,$2)', self.getNid(), msg)
raise mdsExceptions.TclFAILED_ESSENTIAL
try:
pv_wave_y = getattr(self, 'wave_%d_pv_y' % (chan)).data()
wavey.searchw(pv_wave_y)
except:
msg = 'Error reading y waveform %d values' % (chan)
Data.execute('DevLogErr($1,$2)', self.getNid(), msg)
raise mdsExceptions.TclFAILED_ESSENTIAL
wavex.putw([0, 0])
wavey.putw([0, 0])
del wavex
del wavey
print ('========================================================')
return 1
class pv():
# Wrapper for associating CaChannel class to specific PV using its name
def __init__(self, pvname):
try:
self.pv = CaChannel()
self.pv.searchw(pvname)
self.alarm_status = "n/a" # used to store severity provided by callback
self.alarm_severity = "n/a" # used to store severity provided by callback
except :
raise Exception("****** PV not found - "+pvname+" ******")
#return pv
# Wrapper for putw() function - writing a value to PV and waiting for input records to scan (update their value)
def write(self, *args):
try:
if len(args) == 2: # arguments: value, scan_time
self.pv.putw(args[0])
time.sleep(args[1])
if len(args) == 3: # arguments: value, scan_time, type
if args[2] == "STRING":
self.pv.putw(args[0],ca.DBR_STRING)
else:
raise Exception("Type "+ str(args[3]) +" not recognized")
time.sleep(args[1])
print("***W: Set PV "+self.pv.name()+" to "+str(args[0]))
except:
print("Could not set PV "+self.pv.name()+" to "+str(args[0]))
# Similar to write() except it does not print output when successfully sets the value
# Useful for setUp and tearDown methods
def write_silent(self, *args):
try:
if len(args) == 2: # arguments: value, scan_time
self.pv.putw(args[0])
time.sleep(args[1])
if len(args) == 3: # arguments: value, scan_time, type
if args[2] == "STRING":
self.pv.putw(args[0],ca.DBR_STRING)
else:
raise Exception("Type "+ str(args[3]) +" not recognized")
time.sleep(args[1])
except:
print("Could not set PV "+self.pv.name()+" to "+str(args[0]))
# Wrapper for getw()
def read(self, *args):
if len(args) == 1:
if args[0] == "STRING":
val = self.pv.getw(ca.DBR_STRING)
else:
raise Exception("Type "+ str(args[3]) +" not recognized")
print("***R: Read PV "+self.pv.name()+" value "+str(val))
return val
else:
val = self.pv.getw()
print("***R: Read PV "+self.pv.name()+" value "+str(val))
return val
# Wrapper for getw() with CALLBACK for alarm status/severity
def read_alarm(self):
self.pv.array_get_callback(ca.dbf_type_to_DBR_STS(self.pv.field_type()), None, Callback, self)
self.pv.flush_io()
for i in range(20):
self.pv.pend_event()
# Wrapper for name()
def name(self):
return self.pv.name()
def init(self):
print ('================= INIT EPICS WAVE SETUP ===============')
from CaChannel import CaChannel
wavex = CaChannel()
wavey = CaChannel()
trig = CaChannel()
try:
pv_trig_name = self.pv_trig_name.data()
trig.searchw(pv_trig_name)
except:
Data.execute('DevLogErr($1,$2)', self.getNid(),
'Error on PV trigger variable')
raise mdsExceptions.TclFAILED_ESSENTIAL
# trig.searchw('NB-SIGV-GISA:REF-TR_TIME')
try:
trig_data = self.trig_source.data()
except:
Data.execute('DevLogErr($1,$2)', self.getNid(), 'Trigger time')
raise mdsExceptions.TclFAILED_ESSENTIAL
#print('Trigger ', trig_data)
trig.putw(float(trig_data))
for chan in range(1, 8):
# wavex.searchw('NB-SIGV-GISA:PZ%d-WAVEX'%(chan))
# wavey.searchw('NB-SIGV-GISA:PZ%d-WAVEY'%(chan))
if getattr(self, 'wave_%d' % (chan)).isOn():
try:
pv_wave_x = getattr(self, 'wave_%d_pv_x' % (chan)).data()
wavex.searchw(pv_wave_x)
except:
msg = 'Error on PV waveform %d x variable' % (chan)
Data.execute('DevLogErr($1,$2)', self.getNid(), msg)
raise mdsExceptions.TclFAILED_ESSENTIAL
try:
wavex_data = getattr(self, 'wave_%d_x' % (chan)).data()
except:
msg = 'Error reading x waveform %d values' % (chan)
Data.execute('DevLogErr($1,$2)', self.getNid(), msg)
raise mdsExceptions.TclFAILED_ESSENTIAL
try:
pv_wave_y = getattr(self, 'wave_%d_pv_y' % (chan)).data()
wavey.searchw(pv_wave_y)
except:
msg = 'Error reading y waveform %d values' % (chan)
Data.execute('DevLogErr($1,$2)', self.getNid(), msg)
raise mdsExceptions.TclFAILED_ESSENTIAL
try:
wavey_data = getattr(self, 'wave_%d_y' % (chan)).data()
except:
msg = 'Error reading y waveform %d values' % (chan)
Data.execute('DevLogErr($1,$2)', self.getNid(), msg)
raise mdsExceptions.TclFAILED_ESSENTIAL
print('CH %d' % (chan))
print('X = ', wavex_data)
print('Y = ', wavey_data)
wavex.putw(wavex_data)
wavey.putw(wavey_data)
del wavex
del wavey
del trig
print ('=======================================================')
return 1
