def ChangeValueType(self, dtype):
if dtype in self.defaults.keys():
if self.dtype is not None:
self.remove_attribute("Value")
self.dtype = dtype
dev_class = self.get_device_class()
attr_data = PyTango.AttrData(
"Value", dev_class.get_name(),
[[
self.defaults[self.dtype][2], self.defaults[self.dtype][1],
PyTango.READ_WRITE
], {
'description': "dynamic attribute",
}])
self.add_attribute(attr_data,
r_meth=self.read_Value,
w_meth=self.write_Value)
class AD5370DacDS(PyTango.Device_4Impl):
# --------- Add your global variables here --------------------------
# ------------------------------------------------------------------
# Device constructor
# ------------------------------------------------------------------
def __init__(self, cl, name):
PyTango.Device_4Impl.__init__(self, cl, name)
self.stream_lock = None
self.attr_lock = None
self.apply_immediate = None
self.state_thread = None
self.command_queue = None
self.state_handler_dict = None
self.stop_state_thread_flag = None
self.AD5370_dac_device = None
AD5370DacDS.init_device(self)
# ------------------------------------------------------------------
# Device destructor
# ------------------------------------------------------------------
def delete_device(self):
with self.stream_lock:
self.info_stream(''.join(
("[Device delete_device method] for device", self.get_name())))
self.stop_thread()
# ------------------------------------------------------------------
# Device initialization
# ------------------------------------------------------------------
def init_device(self):
self.stream_lock = threading.Lock()
with self.stream_lock:
self.info_stream(''.join(
("In ", self.get_name(), "::init_device()")))
self.set_state(PyTango.DevState.UNKNOWN)
self.get_device_properties(self.get_device_class())
# Try stopping the stateThread if it was started before. Will fail if this
# is the initial start.
try:
self.stop_thread()
except Exception, e:
pass
self.apply_immediate = False
self.attr_lock = threading.Lock()
self.state_thread = threading.Thread()
threading.Thread.__init__(self.state_thread,
target=self.state_handler_dispatcher)
self.command_queue = Queue.Queue(100)
try:
# Add channel attributes if not already defined
attrs = self.get_device_attr()
for ch in range(40):
try:
attrs.get_attr_by_name(''.join(('channel', str(ch))))
self.info_stream(''.join(
('Channel ', str(ch), ' already defined.')))
except PyTango.DevFailed:
# The attribute was not defined, so add it
self.info_stream(''.join(
('Channel ', str(ch),
' not defined, adding attribute.')))
attr_info = [[
PyTango.DevDouble, PyTango.SCALAR, PyTango.READ_WRITE
], {
'description': "DAC output for channel",
'unit': 'V',
'Memorized': "true",
}]
attr_name = ''.join(('channel', str(ch)))
attr_data = PyTango.AttrData(attr_name, self.get_name(),
attr_info)
self.add_attribute(attr_data,
r_meth=self.read_channel,
w_meth=self.write_channel,
is_allo_meth=self.is_channel_allowed)
except Exception, ex:
with self.stream_lock:
self.error_stream('Error when initializing device')
self.error_stream(str(ex))
