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lecroy.py
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lecroy.py
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#!/usr/bin/python
# Program to read and process LeCroy ".trc" files
#
# This program was originally written by Brian Hare and was modified by Jaime
# Caicedo to extend its functionality.
#
# Author: Jaime Caicedo, PhD Student, ILCRT
# Last Updated: 07/20/2014
import struct
import numpy as np
from datetime import datetime
class lecroy_data(object):
def __init__(self, f_name):
with open(f_name,'rb') as fin:
##header_data=fin.read(357)
self.dummy=fin.read(11)
self.descriptor_name=fin.read(16)
self.template_name=fin.read(16)
self.comm_type=struct.unpack('h',fin.read(2))[0] ## byte or word
self.comm_order=struct.unpack('h',fin.read(2))[0]## HiFirst or LoFirst
self.endianness = '<' if self.comm_order else '>'
self.wave_descriptor=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.user_text=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.res_desc1=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.trig_time_array=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.ris_time_array=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.res_array1=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.wave_array_1=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.wave_array_2=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.res_array2=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.res_array3=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.instrament_array=fin.read(16)
self.instrament_number=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.trace_label=fin.read(16)
self.reserved1=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.reserved2=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.wave_array_count=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.pnts_per_screen=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.first_valid_pnt=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.last_valid_point=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.first_point=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.sparsing_factor=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.segment_index=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.subarray_count=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.sweeps_per_acq=struct.unpack(self.endianness + 'l',fin.read(4))[0]
self.points_per_pair=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.pair_offset=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.vertical_gain=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.vertical_offset=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.max_value=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.min_value=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.nominal_bits=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.nom_subarray_count=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.horiz_interval=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.horiz_offset=struct.unpack(self.endianness + 'd',fin.read(8))[0]
self.pixel_offset=struct.unpack(self.endianness + 'd',fin.read(8))[0]
self.vert_unit=fin.read(48)
self.hor_unit=fin.read(48)
self.horiz_uncertanty=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.time_stamp_seconds=struct.unpack(self.endianness + 'd',fin.read(8))[0]
self.time_stamp_minutes=struct.unpack(self.endianness + 'B',fin.read(1))[0]
self.time_stamp_hours=struct.unpack(self.endianness + 'B',fin.read(1))[0]
self.time_stamp_days=struct.unpack(self.endianness + 'B',fin.read(1))[0]
self.time_stamp_months=struct.unpack(self.endianness + 'B',fin.read(1))[0]
self.time_stamp_year=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.time_stamp_unused=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.acq_duration=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.lecroy_record_type=struct.unpack(self.endianness + 'h',fin.read(2))[0]
## singlesweep
##interleaved
##histogram
##graph
##filter coefficient
##complex
##extrema
##sequence obsolete
##centered RIS
##peak detect
self.processing_done=struct.unpack(self.endianness + 'h',fin.read(2))[0]
##no processing
##fir filter
##interpolated
##sparsed
##autoscaled
##no_result
##rolling
##cumulative
self.reserved5=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.RIS_sweeps=struct.unpack(self.endianness + 'h',fin.read(2))[0]
self.timebase=struct.unpack(self.endianness + 'h',fin.read(2))[0]
## tb1_ps
## tb2_ps,
## tb5_ps,
## tb10_ps,
## tb20_ps,
## tb50_ps,
## tb100_ps,
## tb200_ps,
## tb500_ps,
## tb1_ns,
## tb2_ns,
## tb5_ns,
## tb10_ns,
## tb20_ns,
## tb50_ns,
## tb100_ns,
## tb200_ns,
## tb500_ns,
## tb1_us,
## tb2_us,
## tb5_us,
## tb10_us,
## tb20_us,
## tb50_us,
## tb100_us,
## tb200_us,
## tb500_us,
## tb1_ms,
## tb2_ms,
## tb5_ms,
## tb10_ms,
## tb20_ms,
## tb50_ms,
## tb100_ms,
## tb200_ms,
## tb500_ms,
## tb1_s,
## tb2_s,
## tb5_s,
## tb10_s,
## tb20_s,
## tb50_s,
## tb100_s,
## tb200_s,
## tb500_s,
## tb1_ks,
## tb2_ks,
## tb5_ks,
## External=100
self.vert_coupling=struct.unpack(self.endianness + 'h',fin.read(2))[0]
## DC_50_Ohms,
## DC_ground,
## DC_1MOhm,
## AC_ground,
## AC_1MOhm
self.probe_att=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.fixed_vert_gain=struct.unpack(self.endianness + 'h',fin.read(2))[0]
## g1_uV_Per_Div,
## g2_uV_Per_Div,
## g5_uV_Per_Div,
## g10_uV_Per_Div,
## g20_uV_Per_Div,
## g50_uV_Per_Div,
## g100_uV_Per_Div,
## g200_uV_Per_Div,
## g500_uV_Per_Div,
## g1_mV_Per_Div,
## g2_mV_Per_Div,
## g5_mV_Per_Div,
## g10_mV_Per_Div,
## g20_mV_Per_Div,
## g50_mV_Per_Div,
## g100_mV_Per_Div,
## g200_mV_Per_Div,
## g500_mV_Per_Div,
## g1_V_Per_Div,
## g2_V_Per_Div,
## g5_V_Per_Div,
## g10_V_Per_Div,
## g20_V_Per_Div,
## g50_V_Per_Div,
## g100_V_Per_Div,
## g200_V_Per_Div,
## g500_V_Per_Div,
## g1_kV_Per_Div
self.bandwidth_limit=struct.unpack(self.endianness + 'h',fin.read(2))[0] ## on or off
self.vertical_vernier=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.acq_vertical_offset=struct.unpack(self.endianness + 'f',fin.read(4))[0]
self.wave_source=struct.unpack(self.endianness + 'h',fin.read(2))[0]
## Channel_1,
## Channel_2,
## Channel_3,
## Channel_4,
## unknown=9
self.user_text_data = fin.read(self.user_text)
self.trig_time_array_data = fin.read(self.trig_time_array)
self.ris_time_array_data = fin.read(self.ris_time_array)
original_data_string=fin.read()
self.data_type = 'i2' if self.comm_type else 'i1'
self.Data=np.fromstring(original_data_string,dtype=self.endianness + self.data_type)
self.Data = self.Data * self.vertical_gain - self.vertical_offset
def get_trig_time_array_data(self):
return np.fromstring(self.trig_time_array_data, dtype=self.endianness + 'f8')
def get_ris_time_array_data(self):
return np.fromstring(self.ris_time_array_data, dtype=self.endianness + 'f8')
def get_segments(self):
segments = []
pts_segment = len(self.Data) / self.subarray_count
for i in range(self.subarray_count):
segment = self.Data[i*pts_segment:(i+1)*pts_segment]
segments.append(segment)
return segments
def get_segment(self, num=1, calFactor=1):
seg = self.get_segments()
self.data = seg[num - 1] * calFactor
def get_seg_time(self):
self.dataTime = np.arange(0, len(self.Data) / self.subarray_count) * \
self.horiz_interval
return self.dataTime
#~ return np.arange(0,len(self.Data) / self.subarray_count)*self.horiz_interval #- self.horiz_offset
def get_time(self):
return np.arange(0,len(self.Data))*self.horiz_interval #- self.horiz_offset
def repack_header(self):
ret=self.dummy+self.descriptor_name+self.template_name
ret += struct.pack(self.endianness + 'h',self.comm_type)
ret += struct.pack(self.endianness + 'h',self.comm_order)
ret += struct.pack(self.endianness + 'l',self.wave_descriptor)
ret += struct.pack(self.endianness + 'l',self.user_text)
ret += struct.pack(self.endianness + 'l',self.res_desc1)
ret += struct.pack(self.endianness + 'l',self.trig_time_array)
ret += struct.pack(self.endianness + 'l',self.ris_time_array)
ret += struct.pack(self.endianness + 'l',self.res_array1)
ret += struct.pack(self.endianness + 'l',self.wave_array_1)
ret += struct.pack(self.endianness + 'l',self.wave_array_2)
ret += struct.pack(self.endianness + 'l',self.res_array2)
ret += struct.pack(self.endianness + 'l',self.res_array3)
ret += self.instrament_array
ret += struct.pack(self.endianness + 'l',self.instrament_number)
ret += self.trace_label
ret += struct.pack(self.endianness + 'h',self.reserved1)
ret += struct.pack(self.endianness + 'h',self.reserved2)
ret += struct.pack(self.endianness + 'l',self.wave_array_count) #this one
ret += struct.pack(self.endianness + 'l',self.pnts_per_screen) #this one
ret += struct.pack(self.endianness + 'l',self.first_valid_pnt)
ret += struct.pack(self.endianness + 'l',self.last_valid_point)
ret += struct.pack(self.endianness + 'l',self.first_point)
ret += struct.pack(self.endianness + 'l',self.sparsing_factor)
ret += struct.pack(self.endianness + 'l',self.segment_index)
ret += struct.pack(self.endianness + 'l',self.subarray_count)
ret += struct.pack(self.endianness + 'l',self.sweeps_per_acq)
ret += struct.pack(self.endianness + 'h',self.points_per_pair)
ret += struct.pack(self.endianness + 'h',self.pair_offset)
ret += struct.pack(self.endianness + 'f',self.vertical_gain)
ret += struct.pack(self.endianness + 'f',self.vertical_offset)
ret += struct.pack(self.endianness + 'f',self.max_value) #this one
ret += struct.pack(self.endianness + 'f',self.min_value) #this one
ret += struct.pack(self.endianness + 'h',self.nominal_bits)
ret += struct.pack(self.endianness + 'h',self.nom_subarray_count)
ret += struct.pack(self.endianness + 'f',self.horiz_interval)
ret += struct.pack(self.endianness + 'd',self.horiz_offset)
ret += struct.pack(self.endianness + 'd',self.pixel_offset)
ret += self.vert_unit
ret += self.hor_unit
ret += struct.pack(self.endianness + 'f',self.horiz_uncertanty)
ret += struct.pack(self.endianness + 'd',self.time_stamp_seconds)
ret += struct.pack(self.endianness + 'B',self.time_stamp_minutes)
ret += struct.pack(self.endianness + 'B',self.time_stamp_hours)
ret += struct.pack(self.endianness + 'B',self.time_stamp_days)
ret += struct.pack(self.endianness + 'B',self.time_stamp_months)
ret += struct.pack(self.endianness + 'h',self.time_stamp_year)
ret += struct.pack(self.endianness + 'h',self.time_stamp_unused)
ret += struct.pack(self.endianness + 'f',self.acq_duration)
ret += struct.pack(self.endianness + 'h',self.lecroy_record_type)
ret += struct.pack(self.endianness + 'h',self.processing_done)
ret += struct.pack(self.endianness + 'h',self.reserved5)
ret += struct.pack(self.endianness + 'h',self.RIS_sweeps)
ret += struct.pack(self.endianness + 'h',self.timebase)
ret += struct.pack(self.endianness + 'h',self.vert_coupling)
ret += struct.pack(self.endianness + 'f',self.probe_att)
ret += struct.pack(self.endianness + 'h',self.fixed_vert_gain)
ret += struct.pack(self.endianness + 'h',self.bandwidth_limit)
ret += struct.pack(self.endianness + 'f',self.vertical_vernier)
ret += struct.pack(self.endianness + 'f',self.acq_vertical_offset)
ret += struct.pack(self.endianness + 'h',self.wave_source)
return ret
def repack_data(self):
return self.Data.tostring()
def get_timestamp(self):
sec = self.time_stamp_seconds
min = self.time_stamp_minutes
hour_ = self.time_stamp_hours
day_ = self.time_stamp_days
month_ = self.time_stamp_months
year_ = self.time_stamp_year
micro = (sec-int(sec))*1000000
return datetime(year=year_, month=month_, day=day_, hour=hour_,
minute=min, second=int(sec), microsecond=int(micro))