def init(self):
self.iseg = IsegShqCom(port_num=self._init['port'])
self.iseg.init_iseg()
for ch in self.iseg.channel_list:
# default values
if 'trip_current_ma' in self._conf:
self.iseg.write_i_trip_ma(channel=ch, current=self._init['trip_current_ma'])
if 'trip_current_ua' in self._conf:
self.iseg.write_i_trip_ua(channel=ch, current=self._init['trip_current_ua'])
if 'ramp_speed' in self._conf:
self.iseg.write_v_ramp(channel=ch, ramp_speed=self._init['ramp_speed'])
self.trip_reset(channel=ch)
class IsegShq(HardwareLayer):
'''Python interface for ISEG SHQ series
Example:
--------
hw_drivers:
- name : SHQ
type : iseg_shq
interface : None
init :
port : COM1
trip_current_ma : 0
trip_current_ua : 0
ramp_speed : 2
registers:
- name : HV
type : FunctionalRegister
hw_driver : SHQ
arg_names : [value]
arg_add : {'channel': 1}
Usage:
------
dut = basil.DUT(config.yaml)
dut.init()
dut['HV'].set_voltage(value=10.0)
'''
def __init__(self, intf, conf):
super(IsegShq, self).__init__(intf, conf)
def init(self):
self.iseg = IsegShqCom(port_num=self._init['port'])
self.iseg.init_iseg()
for ch in self.iseg.channel_list:
# default values
if 'trip_current_ma' in self._conf:
self.iseg.write_i_trip_ma(channel=ch, current=self._init['trip_current_ma'])
if 'trip_current_ua' in self._conf:
self.iseg.write_i_trip_ua(channel=ch, current=self._init['trip_current_ua'])
if 'ramp_speed' in self._conf:
self.iseg.write_v_ramp(channel=ch, ramp_speed=self._init['ramp_speed'])
self.trip_reset(channel=ch)
def set_voltage(self, channel, value=0, unit='V', ramp_speed=None):
if unit == 'raw':
raw = value
elif unit == 'V':
raw = value
elif unit == 'mV':
raw = value * 0.001
else:
raise TypeError("Invalid unit type.")
if ramp_speed:
self.write_v_ramp(self, channel=channel, ramp_speed=ramp_speed)
self.iseg.write_v_set(channel, raw)
logging.info('Ramping voltage...')
self.iseg.write_start_ramp(channel)
while True:
status = self.iseg.read_status_word(channel=channel)
if status == 'L2H' or status == 'H2L':
pass
elif status == 'ON':
break
else:
logging.warning('CH%d: ramping voltage failed with status %s (%s)', channel, status, status_words[status])
break
logging.info('Finished ramping voltage')
def get_voltage(self, channel, unit='V'):
raw = self.iseg.read_voltage(channel)
if unit == 'raw':
return raw
elif unit == 'V':
return raw
elif unit == 'mV':
return raw * 1000.0
else:
raise TypeError("Invalid unit type.")
def get_current(self, channel, unit='A'):
raw = self.iseg.read_current(channel)
if unit == 'raw':
return raw
elif unit == 'A':
return raw
elif unit == 'mA':
return raw * 1000.0
elif unit == 'uA':
return raw * 1000000.0
elif unit == 'nA':
return raw * 1000000000.0
else:
raise TypeError("Invalid unit type.")
def trip_reset(self, channel):
loop_cnt = 0
while True:
status = self.iseg.read_status_word(channel=channel)
if status == 'ON' or status == 'OFF':
break
if loop_cnt >= 3:
logging.warning('CH%d: status %s (%s) after trip reset', channel, status, status_words[status])
break
loop_cnt += 1
