def check_dmm(self, dmm_address):
dmm = DMM()
try:
dmm.connect(dmm_address)
dmm.close()
return True
except Exception:
traceback.print_exc()
return False
class Calibrator(threading.Thread):
VOLTAGE = "Voltage"
CURRENT = "Current"
STEPS = 16
WAIT_PERIOD = 1.0
def make_step_table(self):
if self.voltage_or_current == self.VOLTAGE:
max_step = 0xffff;
else:
max_step = int(4.6 / 5.0 * 0xffff)
step_size = max_step / (self.STEPS-2)
#
# We need more resolution down low so add a half-step at the
# beginning and then continue evenly after that
#
for i in range(self.STEPS):
if i == 0:
self.steps.append(0)
elif i == 1:
self.steps.append(step_size/4)
elif i == 2:
self.steps.append(step_size / 2)
else:
self.steps.append((i-2) * step_size)
def __init__(self, power_supply_channel, voltage_or_current, dmm_ip, callback):
self.power_supply_channel = power_supply_channel
self.voltage_or_current = voltage_or_current
self.dmm = DMM()
self.dmm.connect(dmm_ip)
self.callback = callback
self.step_num = 0
self.steps = []
self.make_step_table()
self.exit_event = threading.Event()
threading.Thread.__init__(self)
self.values = []
print("Calibrator type = ", voltage_or_current);
def stop(self):
self.exit_event.set()
self.join()
def write_voltage_cal_to_channel(self):
self.power_supply_channel.set_voltage_dac_cal_points(self.STEPS)
for i in range(self.STEPS):
self.power_supply_channel.set_voltage_dac_cal(i, self.values[i][0], self.values[i][1])
self.power_supply_channel.save_voltage_dac_cal()
self.power_supply_channel.set_voltage_adc_cal_points(self.STEPS)
for i in range(self.STEPS):
self.power_supply_channel.set_voltage_adc_cal(i, self.values[i][2], self.values[i][1])
self.power_supply_channel.save_voltage_adc_cal()
self.power_supply_channel.cal_enable(False)
def write_current_cal_to_channel(self):
self.power_supply_channel.set_current_dac_cal_points(self.STEPS)
for i in range(self.STEPS):
self.power_supply_channel.set_current_dac_cal(i, self.values[i][0], self.values[i][1])
self.power_supply_channel.save_current_dac_cal()
self.power_supply_channel.set_current_adc_cal_points(self.STEPS)
for i in range(self.STEPS):
self.power_supply_channel.set_current_adc_cal(i, self.values[i][2], self.values[i][1])
self.power_supply_channel.save_current_adc_cal()
self.power_supply_channel.cal_enable(False)
def run(self):
self.power_supply_channel.cal_enable(True)
while not self.exit_event.wait(self.WAIT_PERIOD) and not self.is_done():
self.do_next()
#
# Write the cal table
#
if self.voltage_or_current == self.VOLTAGE:
self.write_voltage_cal_to_channel()
else:
self.write_current_cal_to_channel()
self.callback.complete(self.values)
def is_done(self):
return self.step_num >= self.STEPS
def do_next(self):
next_count = self.steps[self.step_num]
# self.callback.status("0x%4X = " % self.next_count)
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.set_voltage_dac(next_count);
time.sleep(2.0)
dmm_reading = self.dmm.read_voltage()
adc_reading = self.power_supply_channel.get_voltage_adc()
else:
self.power_supply_channel.set_current_dac(next_count);
time.sleep(2.0)
dmm_reading = self.dmm.read_current()
adc_reading = self.power_supply_channel.get_current_adc()
self.callback.status("0x%4X = %3.3f, ADC=0x%4X" % (next_count, dmm_reading, adc_reading))
self.values.append((next_count, dmm_reading, adc_reading))
self.callback.progress(int(float(self.step_num) / float(self.STEPS) * 100.0))
self.step_num += 1
class Calibrator(threading.Thread):
VOLTAGE="Voltage"
CURRENT="Current"
STEPS=16
WAIT_PERIOD=1.0
def __init__(self,power_supply_channel,voltage_or_current,dmm_ip,callback):
self.power_supply_channel = power_supply_channel
self.voltage_or_current = voltage_or_current
self.dmm = DMM()
self.dmm.connect(dmm_ip)
self.callback = callback
if voltage_or_current == self.VOLTAGE:
self.max = 0xffff;
else:
self.max = int(4.6/5.0 * 0xffff)
self.step = self.max / self.STEPS
self.step_num=0
self.exit_event = threading.Event()
threading.Thread.__init__(self)
self.values = []
print("Calibrator type = ",voltage_or_current);
def stop(self):
self.exit_event.set()
self.join()
def run(self):
self.power_supply_channel.cal_enable(True)
while not self.exit_event.wait(self.WAIT_PERIOD) and not self.is_done():
self.do_next()
#
# Write the cal table
#
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.set_voltage_dac_cal_points(self.STEPS)
else:
self.power_supply_channel.set_current_dac_cal_points(self.STEPS)
for i in range(self.STEPS):
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.set_voltage_dac_cal(i,self.values[i][0],self.values[i][1])
else:
self.power_supply_channel.set_current_dac_cal(i,self.values[i][0],self.values[i][1])
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.save_voltage_dac_cal()
else:
self.power_supply_channel.save_current_dac_cal()
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.set_voltage_adc_cal_points(self.STEPS)
else:
self.power_supply_channel.set_current_adc_cal_points(self.STEPS)
for i in range(self.STEPS):
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.set_voltage_adc_cal(i,self.values[i][2],self.values[i][1])
else:
self.power_supply_channel.set_current_adc_cal(i,self.values[i][2],self.values[i][1])
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.save_voltage_adc_cal()
else:
self.power_supply_channel.save_current_adc_cal()
self.power_supply_channel.cal_enable(False)
self.callback.complete(self.values)
def is_done(self):
return self.step_num >= self.STEPS
def do_next(self):
next_count = self.step_num * self.step
# self.callback.status("0x%4X = " % self.next_count)
if self.voltage_or_current == self.VOLTAGE:
self.power_supply_channel.set_voltage_dac(next_count);
time.sleep(2.0)
dmm_reading = self.dmm.read_voltage()
adc_reading = self.power_supply_channel.get_voltage_adc()
else:
self.power_supply_channel.set_current_dac(next_count);
time.sleep(2.0)
dmm_reading = self.dmm.read_current()
adc_reading = self.power_supply_channel.get_current_adc()
self.callback.status("0x%4X = %3.3f, ADC=0x%4X" % (next_count,dmm_reading,adc_reading))
self.values.append((next_count,dmm_reading,adc_reading))
self.callback.progress( int(float(self.step_num)/float(self.STEPS) * 100.0))
self.step_num += 1