def get_input_means(handle, gainlist, caldict):
"""Returns the mean voltages [chA mean, chB mean]
Arguments:
handle -- Serial object for the CGR-101
gainlist -- Gain configuration
caldict -- A dictionary of (calibration factor names) : values
"""
offsets = []
trigdict = utils.get_trig_dict(3,0,0,512)
[ctrl_reg, fsamp_act] = utils.set_ctrl_reg(handle, 1e5, trigdict)
tracedata = utils.get_uncal_forced_data(handle,ctrl_reg)
voltdata = utils.get_cal_data(caldict,gainlist,tracedata)
offsets.append(mean(voltdata[0]))
offsets.append(mean(voltdata[1]))
return(offsets)
def set_sample_rate(handle, config, drive_frequency, trigger_dictionary):
"""Returns the sample rate set to acquire multiple periods of the drive frequency
We need to send the trigger dictionary along with the drive
frequency because the two settings share the same register.
Arguments:
handle -- Serial object for the CGR scope
config -- The configuration file object
drive_frequency -- The drive frequency (Hz)
trigger_dictionary -- Trigger settings
"""
capture_points = 1024 # Points acquired after a trigger
seconds_needed = int(config['Sweep']['cycles'])/drive_frequency
target_rate = capture_points/seconds_needed
[control_register_value, actual_samplerate] = utils.set_ctrl_reg(
handle, target_rate, trigger_dictionary
)
return actual_samplerate
def main():
logger.debug('Utility module number is ' + str(utils.utilnum))
config = load_config(args.rcfile)
global ch,fh # Need to modify console and file logger handlers
# with the config file, from inside main(). They
# thus must be made global.
(ch,fh) = init_logger(config,ch,fh)
# Trigger is hard coded to internal (auto trigger) for the
# calibration code.
trigdict = utils.get_trig_dict(3,0,0,0)
cgr = utils.get_cgr(config) # Connect to the unit
caldict = utils.load_cal(cgr, config['Calibration']['calfile'])
gainlist = utils.set_hw_gain(
cgr, [int(config['Inputs']['Aprobe']),
int(config['Inputs']['Bprobe'])
]
)
utils.set_trig_level(cgr, caldict, gainlist, trigdict)
utils.set_trig_samples(cgr,trigdict)
[ctrl_reg, fsamp_act] = utils.set_ctrl_reg(
cgr, float(config['Acquire']['rate']), trigdict
)
if not (fsamp_act == float(config['Acquire']['rate'])):
logger.warning(
'Requested sample frequency ' + '{:0.3f} kHz '.format(
float(config['Acquire']['rate'])/1000
)
+ 'adjusted to ' + '{:0.3f} kHz '.format(
float(fsamp_act)/1000
)
)
# Start the offset calibration
caldict = get_offsets(cgr, ctrl_reg, gainlist, caldict, config)
# Start the slope calibration
caldict = get_slopes(cgr, ctrl_reg, gainlist, caldict, config)
utils.write_cal(cgr, config['Calibration']['calfile'], caldict)
def main():
logger.debug('Utility module number is ' + str(utils.utilnum))
config = load_config(args.rcfile)
global ch,fh # Need to modify console and file logger handlers
# with the config file, from inside main(). They
# thus must be made global.
(ch,fh) = init_logger(config,ch,fh)
trigdict = utils.get_trig_dict( int(config['Trigger']['source']),
float(config['Trigger']['level']),
int(config['Trigger']['polarity']),
int(config['Trigger']['points'])
)
cgr = utils.get_cgr(config)
caldict = utils.load_cal(cgr, config['Calibration']['calfile'])
eeprom_list = utils.get_eeprom_offlist(cgr)
gainlist = utils.set_hw_gain(
cgr, [int(config['Inputs']['Aprobe']),
int(config['Inputs']['Bprobe'])
]
)
utils.set_trig_level(cgr, caldict, gainlist, trigdict)
utils.set_trig_samples(cgr,trigdict)
[ctrl_reg, fsamp_act] = utils.set_ctrl_reg(
cgr, float(config['Acquire']['rate']), trigdict
)
if not (fsamp_act == float(config['Acquire']['rate'])):
logger.warning(
'Requested sample frequency ' + '{:0.3f} kHz '.format(
float(config['Acquire']['rate'])/1000
)
+ 'adjusted to ' + '{:0.3f} kHz '.format(
float(fsamp_act)/1000
)
)
# Wait for trigger, then return uncalibrated data
gplot = plotinit() # Create plot object
for capturenum in range(int(config['Acquire']['averages'])):
if trigdict['trigsrc'] == 3:
# Internal trigger
tracedata = utils.get_uncal_forced_data(cgr,ctrl_reg)
elif trigdict['trigsrc'] < 3:
# Trigger on a voltage present at some input
tracedata = utils.get_uncal_triggered_data(cgr,trigdict)
logger.info('Acquiring trace ' + str(capturenum + 1) + ' of ' +
str(config['Acquire']['averages']))
if capturenum == 0:
sumdata = tracedata
else:
sumdata = add(sumdata,tracedata)
avgdata = divide(sumdata,float(capturenum +1))
# Apply calibration
voltdata = utils.get_cal_data(
caldict,gainlist,[avgdata[0],avgdata[1]]
)
timedata = utils.get_timelist(fsamp_act)
logger.debug(
'Plotting average of ' + str(capturenum + 1) + ' traces.'
)
plotdata(gplot, timedata, voltdata, trigdict)
savedata(config, timedata, voltdata)
raw_input('Press any key to close plot and exit...')