def _create_monitor(self, chan, name):
"""Creates a monitor for the PV's value.
Args:
chan (CaChannel): The channel object.
name (string): The PV name.
"""
def _block_updated_callback(epics_args, user_args):
# Update the current value...
self.curr_lock.acquire()
try:
self.curr_values[user_args[0]] = (epics_args['pv_value'], epics_args['type'])
except:
# Don't care, it is all about releasing the lock
print "Could not update value"
pass
finally:
# Must release lock
self.curr_lock.release()
pass
ftype = chan.field_type()
if ca.dbr_type_is_ENUM(ftype) or ca.dbr_type_is_STRING(ftype):
req_type = ca.DBR_STRING
else:
req_type = ca.dbf_type_to_DBR_STS(ftype)
chan.add_masked_array_event(
req_type,
None,
ca.DBE_VALUE | ca.DBE_ALARM,
_block_updated_callback,
name)
chan.pend_event(PEND_EVENT_TIMEOUT)
def _get_type_as_string(self, ftype):
if ftype is not None:
if ca.dbr_type_is_ENUM(ftype) or ca.dbr_type_is_STRING(ftype):
return "STRING"
elif ca.dbr_type_is_CHAR(ftype):
return "CHAR"
else:
return "NUMERIC"
return "UNKNOWN"
