def __init__(self, dm, config, name):
Device.__init__(self, dm, config, name)
self.config = config
self.lock = Mutex(Mutex.Recursive)
self.index = None
self.devRackGui = None
self.stateLock = Mutex(Mutex.Recursive) ## only for locking self.lastState and self.lastMode
self.lastState = {}
self.lastMode = None
try:
# default holding state
self.holding = {
'VC': -50e-3,
'IC': 0.0,
'I=0': 0.0
}
self.mc = MultiClampDriver.instance().getChannel(self.config['channelID'], self.mcUpdate)
## wait for first update..
c = 0
while self.mc.getState() is None:
time.sleep(0.1)
c += 1
if c > 50:
raise Exception("Timed out waiting for first update from multi clamp commander.")
print "Created MultiClamp device", self.config['channelID']
## set configured holding values
if 'vcHolding' in self.config:
self.holding['VC'] = self.config['vcHolding']
if 'icHolding' in self.config:
self.holding['IC'] = self.config['icHolding']
## Set up default MC settings for each mode, then leave MC in I=0 mode
# look for 'defaults', followed by 'settings' (for backward compatibility)
defaults = self.config.get('defaults', self.config.get('settings', None))
if defaults is not None:
for mode in ['IC', 'VC']:
if mode in defaults:
#print "set mode", mode
self.setMode(mode)
#print "set params"
self.mc.setParams(defaults[mode])
self.setMode('I=0') ## safest mode to leave clamp in
except:
try:
mc = MultiClampDriver.instance()
if mc is not None:
mc.quit()
except:
pass
raise
dm.declareInterface(name, ['clamp'], self)
def quit(self):
mc = MultiClampDriver.instance()
if mc is not None:
mc.quit()
