def check_current_offset(args, text):
"""Check current offset."""
offset_status = None
adc_meas_poz = adc_ad7091r5.current_value(args['adc_offset_poz'],
args['adc_gain_poz'],
args['i_gain_poz'],
args['adc_samples'])[0]
adc_meas_neg = adc_ad7091r5.current_value(args['adc_offset_neg'],
args['adc_gain_neg'],
args['i_gain_neg'],
args['adc_samples'])[0]
if (adc_meas_poz == 0.0) and (adc_meas_neg == 0.0):
offset_status = text['green'] + 'Current offset OK' + \
text['default']
else:
offset_status = text['red'] + 'Current offset detected' + \
text['default']
return offset_status + '\n'
def check_adc_csa(offset_i, adc_i_ref, i_ref):
"""Check ADC calibration for selected channel."""
done = False
while not done:
adc = adc_ad7091r5.current_value(offset_i, adc_i_ref, i_ref, 1000)
key = wait_key('\t ADC: {:<20} \r'.format(adc), 1)
if key == '':
done = True
break
def positive_current_measurement(args, text):
"""MEASURE POSITIVE CURRENT CHA/B.
Connect channel A or B at Load and enable ADC external reference
Set channel A or B to source voltage setpoint and get samples
Set again channel A or B to source voltage setpoint
and measure resulted current with external ADC and CSA
Optional is possible to generate plot images and display debug messages
Compare current difference between measurement and reference
to be in reference range then print PASS or FAIL message
"""
if args['restart_verification'] == 0:
ioxp_adp5589.gpo_set_ac(['GPIO_8__1', 'GPIO_1__1', 'EN_1V2__1'])
if args['restart_verification'] == 1:
ioxp_adp5589.gpo_set_ac(['GPIO_7__1', 'GPIO_1__1', 'EN_1V2__1'])
control_m1k.source(args['channel_index'], global_.Mode.SVMI,
args['svmi_setpoint_poz'], global_.Mode.HI_Z,
args['device'])
control_m1k.get_samples_find_average(args['device'])
control_m1k.source(args['channel_index'], global_.Mode.SVMI,
args['svmi_setpoint_poz'], global_.Mode.HI_Z,
args['device'])
adc_meas = adc_ad7091r5.current_value(args['adc_offset_poz'],
args['adc_gain_poz'],
args['i_gain_poz'],
args['adc_samples'])[0]
if args['create_plots']:
debug.plot(
str(args['device_id'] + '/Performance'),
'8__P__CH_' + args['channel_name'] + '_measure_positive_current',
global_.CHX_V_I[4], str(args['channel_index'] * 2 + 1))
if args['view_debug_messages']:
print '\n', global_.CHX_V_I[args['channel_index'] * 2 + 1], '-', \
adc_meas, '=> abs():', \
abs(global_.CHX_V_I[args['channel_index'] * 2 + 1] - adc_meas), \
'should be <=', abs(adc_meas * args['tolerance_current'])
if abs(global_.CHX_V_I[args['channel_index'] * 2 + 1] - adc_meas) <= \
abs(adc_meas * args['tolerance_current']):
debug_message = text['green'] + 'Measure ' + \
'{0:+.4f}'.format(adc_meas) + ' [A] CH_' + \
args['channel_name'] + ' PASS' + text['default']
args['status'].append(True)
args['status_values'].append('{0:+.4f}'.format(adc_meas))
else:
debug_message = text['red'] + 'Measure ' + \
'{0:+.4f}'.format(adc_meas) + ' [A] CH_' + \
args['channel_name'] + ' FAIL' + text['default']
args['status'].append(False)
args['status_values'].append('{0:+.4f}'.format(adc_meas))
if not args['enable_debug_mode']:
print debug_message
exit(1)
if args['view_short_debug_messages']:
print debug_message
return args['status']
def predetermine_resistance(polarity):
"""Calculate resistance besed on ADC measurements after calibration."""
ex_1v2_ref = eeprom_m24c02.read_write(0x08, '', 8, 'float')
adc_offset_vin3 = int(eeprom_m24c02.read_write(0x50, '', 2, 'float'))
adc_scale_vin3 = eeprom_m24c02.read_write(0x53, '', 6, 'float')
adc_gain_vin3 = eeprom_m24c02.read_write(0x5A, '', 6, 'float')
adc_params_3 = [ex_1v2_ref, adc_offset_vin3, adc_scale_vin3, adc_gain_vin3]
adc_offset_vin2 = int(eeprom_m24c02.read_write(0x40, '', 2, 'float'))
adc_scale_vin2 = eeprom_m24c02.read_write(0x43, '', 6, 'float')
adc_gain_vin2 = eeprom_m24c02.read_write(0x4A, '', 6, 'float')
adc_params_2 = [ex_1v2_ref, adc_offset_vin2, adc_scale_vin2, adc_gain_vin2]
adc_offset_poz = int(eeprom_m24c02.read_write(0x70, '', 3, 'hex'), 16)
adc_gain_poz = int(eeprom_m24c02.read_write(0x75, '', 3, 'hex'), 16)
i_gain_poz = eeprom_m24c02.read_write(0x7A, '', 6, 'float')
adc_offset_neg = int(eeprom_m24c02.read_write(0x80, '', 3, 'hex'), 16)
adc_gain_neg = int(eeprom_m24c02.read_write(0x85, '', 3, 'hex'), 16)
i_gain_neg = eeprom_m24c02.read_write(0x89, '', 7, 'float')
if polarity == 'poz':
ref_2v5_srs = adc_ad7091r5.voltage_input(3, adc_params_3, 1000)[0]
chx_voltage_srs = adc_ad7091r5.voltage_input(2, adc_params_2, 1000)[0]
current_chx_poz = adc_ad7091r5.current_value(adc_offset_poz,
adc_gain_poz, i_gain_poz,
1000)[0]
voltage = chx_voltage_srs + 0.022 - ref_2v5_srs
resistance_srs = voltage / current_chx_poz
print(resistance_srs)
if polarity == 'neg':
ref_2v5_snc = adc_ad7091r5.voltage_input(3, adc_params_3, 1000)[0]
chx_voltage_snc = adc_ad7091r5.voltage_input(2, adc_params_2, 1000)[0]
current_chx_neg = adc_ad7091r5.current_value(adc_offset_neg,
adc_gain_neg, i_gain_neg,
1000)[0]
voltage = chx_voltage_snc - 0.027 - ref_2v5_snc
resistance_snc = voltage / current_chx_neg
print(resistance_snc)
def negative_current_source(args, text):
"""SOURCE NEGATIVE CURRENT CHA/B.
Set channel A or B to source reference current and get samples
Set again channel A or B to source reference current
and measure resulted current with external ADC and CSA
Optional is possible to generate plot images and display debug messages
Compare current difference between measurement and reference
to be in reference range then print PASS or FAIL message
"""
control_m1k.source(args['channel_index'], global_.Mode.SIMV,
args['srs_i_setpoint_neg'], global_.Mode.HI_Z,
args['device'])
control_m1k.get_samples_find_average(args['device'])
control_m1k.source(args['channel_index'], global_.Mode.SIMV,
args['srs_i_setpoint_neg'], global_.Mode.HI_Z,
args['device'])
adc_meas = adc_ad7091r5.current_value(args['adc_offset_neg'],
args['adc_gain_neg'],
args['i_gain_neg'],
args['adc_samples'])[0]
if args['create_plots']:
debug.plot(
str(args['device_id'] + '/Performance'),
'11__P__CH_' + args['channel_name'] + '_source_negative_current',
global_.CHX_V_I[4], str(args['channel_index'] * 2 + 1))
if args['view_debug_messages']:
print '\n', 'adc_meas', adc_meas
if abs(adc_meas - args['srs_i_setpoint_neg']) <= \
abs(adc_meas * args['tolerance_current']):
debug_message = text['green'] + 'Source ' + \
'{0:+.4f}'.format(args['srs_i_setpoint_neg']) + \
' [A] CH_' + args['channel_name'] + ' PASS' + text['default']
args['status'].append(True)
args['status_values'].append('{0:+.4f}'.format(adc_meas))
else:
debug_message = text['red'] + 'Source ' + \
'{0:+.4f}'.format(args['srs_i_setpoint_neg']) + \
' [A] CH_' + args['channel_name'] + ' FAIL' + text['default']
args['status'].append(False)
args['status_values'].append('{0:+.4f}'.format(adc_meas))
if not args['enable_debug_mode']:
print debug_message
exit(1)
if args['view_short_debug_messages']:
print debug_message
return args['status']