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"""
Provide basic class to operate scope
Created by Eugeniy E. Mikhailov 2021/11/29
"""
from qolab.hardware.scpi import SCPIinstr
from qolab.data.trace import TraceSetSameX
from qolab.file_utils import get_next_data_file
import yaml
class Scope:
# Minimal set of methods to be implemented by a scope.
def __init__(self):
self.numberOfChannels = 0
self.fname_prefix = 'scope'
self.savepath = './scope'
# deviceProperties must have 'get' and preferably 'set' methods available,
# i.e. 'SampleRate' needs getSampleRate() and love to have setSampleRate(value)
# they will be used to obtain config and set device according to it
self.deviceProperties = ['SampleRate', 'TimePerDiv', 'TrigDelay', ];
# same is applied to channelProperties but we need setter/getter with channel number
# i.e. VoltsPerDiv -> getChanVoltsPerDiv(chNum) and setSampleRate(chNum, value)
self.channelProperties = ['VoltsPerDiv', 'Offset', ]
def getTrace(self, chNum, availableNpnts=None, maxRequiredPoints=None):
# Should work with minimal arguments list
# but might be faster if parameters provided: less IO requests
warnings.warn( 'this function is not implemented' )
def getAllTraces(self, availableNpnts=None, maxRequiredPoints=None):
allTraces=TraceSetSameX('scope traces')
for chNum in range(1, self.numberOfChannels+1):
allTraces.addTrace( self.getTrace(chNum, availableNpnts, maxRequiredPoints) )
return( allTraces )
def getConfig(self):
config = {}
dconfig = {}
dconfig['id'] = self.idn
for p in self.deviceProperties:
getter = f'get{p}'
if not hasattr(self, getter):
print(f'warning no getter for {p}, i.e. {getter} is missing')
continue
res = getattr(self, getter)()
dconfig[p] = res
config['Device'] = dconfig
chconfig = {}
for chNum in range(1, self.numberOfChannels+1):
chNconfig = {}
for p in self.channelProperties:
getter = f'getChan{p}'
if not hasattr(self, getter):
print(f'warning no getter for {p}, i.e. {getter} is missing')
continue
res = getattr(self, getter)(chNum)
chNconfig[p] = res
chconfig[chNum] = chNconfig
config['Channels']=chconfig
return config
def getHeader(self):
header = yaml.dump(self.getConfig(), default_flow_style=False, sort_keys=False)
header = header.split('\n')
return header
def save(self, fname=None, item_format='e', availableNpnts=None, maxRequiredPoints=None, extention='dat'):
allTraces = self.getAllTraces(availableNpnts=availableNpnts, maxRequiredPoints=maxRequiredPoints)
if fname is None:
fname = get_next_data_file(self.fname_prefix, self.savepath, extention=extention)
allTraces.save(fname, item_format=item_format)
return(fname)
class ScopeSCPI(SCPIinstr, Scope):
"""
Do not instantiate directly, use
rm = pyvisa.ResourceManager()
ScopeSCPI(rm.open_resource('TCPIP::192.168.0.2::INSTR'))
"""
pass
def __init__(self, resource):
SCPIinstr.__init__(self, resource)
Scope.__init__(self)
from .sds1104x import SDS1104X
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