first version of lakeshore 340 driver

Change-Id: Ie9a68be61e142802b2e71420b87623b7a4b4f645

cfg/ls340_cfg.py

@@ -0,0 +1,36 @@
+Node('ls340test.psi.ch',
+     'ls340 test',
+     'tcp://5000',
+)
+Mod('io',
+    'frappy_psi.lakeshore.Ls340IO',
+    'communication to ls340',
+    uri = 'tcp://ldmprep56-ts:3002'
+)
+
+Mod('T',
+    'frappy_psi.lakeshore.TemperatureLoop340',
+    'sample temperature',
+    output_module = 'Heater',
+    target = Param(max=470),
+    io = 'io',
+    channel = 'A',
+)
+
+Mod('T_cold_finger',
+    'frappy_psi.lakeshore.Sensor340',
+    'cold finger temperature',
+    io = 'io',
+    channel = 'B'
+)
+
+Mod('Heater',
+    'frappy_psi.lakeshore.HeaterOutput',
+    'heater output',
+    channel = 'A',
+    io = 'io',
+    resistance = 50,
+    max_power = 50,
+    current = 1
+)
+