OscScreenGrabLAN.py

#!/usr/bin/env python3

from telnetlib_receive_all import Telnet
from Rigol_functions import *
import time
import sys
import os
import platform
import logging

__version__ = 'v1.1.0'
# Added TMC Blockheader decoding
# Added possibility to manually allow run for scopes other then DS1000Z
__author__ = 'RoGeorge'

#
# TODO: Write all SCPI commands in their short name, with capitals
# TODO: Add ignore instrument model switch instead of asking
#
# TODO: Detect if the scope is in RUN or in STOP mode (looking at the length of data extracted)
# TODO: Add logic for 1200/mdep points to avoid displaying the 'Invalid Input!' message
# TODO: Add message for csv data points: mdep (all) or 1200 (screen), depending on RUN/STOP state, MATH and WAV:MODE
# TODO: Add STOP scope switch
#
# TODO: Add debug switch
# TODO: Clarify info, warning, error, debug and print messages
#
# TODO: Add automated version increase
#
# TODO: Extract all memory datapoints. For the moment, CSV is limited to the displayed 1200 datapoints.
# TODO: Use arrays instead of strings and lists for csv mode.
#
# TODO: variables/functions name refactoring
# TODO: Fine tune maximum chunk size request
# TODO: Investigate scaling. Sometimes 3.0e-008 instead of expected 3.0e-000
# TODO: Add timestamp and mark the trigger point as t0
# TODO: Use channels label instead of chan1, chan2, chan3, chan4, math
# TODO: Add command line parameters file path
# TODO: Speed-up the transfer, try to replace Telnet with direct TCP
# TODO: Add GUI
# TODO: Add browse and custom filename selection
# TODO: Create executable distributions
#

# Set the desired logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
logging.basicConfig(level=logging.INFO,
                    format='%(asctime)s - %(levelname)s - %(message)s',
                    filename=os.path.basename(sys.argv[0]) + '.log',
                    filemode='w')

logging.info("***** New run started...")
logging.info("OS Platform: " + str(platform.uname()))
log_running_python_versions()

# Update the next lines for your own default settings:
path_to_save = "captures/"
save_format = "PNG"
IP_DS1104Z = "192.168.1.3"

# Rigol/LXI specific constants
port = 5555

big_wait = 10
smallWait = 1

company = 0
model = 1
serial = 2

# Check command line parameters
script_name = os.path.basename(sys.argv[0])


def print_help():
    print ()
    print ("Usage:")
    print ("    " + "python " + script_name + " png|bmp|csv [oscilloscope_IP [save_path]]")
    print ()
    print ("Usage examples:")
    print ("    " + "python " + script_name + " png")
    print ("    " + "python " + script_name + " csv 192.168.1.3")
    print ()
    print ("The following usage cases are not yet implemented:")
    print ("    " + "python " + script_name + " bmp 192.168.1.3 my_place_for_captures")
    print ()
    print ("This program captures either the waveform or the whole screen")
    print ("    of a Rigol DS1000Z series oscilloscope, then save it on the computer")
    print ("    as a CSV, PNG or BMP file with a timestamp in the file name.")
    print ()
    print ("    The program is using LXI protocol, so the computer")
    print ("    must have LAN connection with the oscilloscope.")
    print ("    USB and/or GPIB connections are not used by this software.")
    print ()
    print ("    No VISA, IVI or Rigol drivers are needed.")
    print ()

# Read/verify file type
if len(sys.argv) <= 1:
    print_help()
    sys.exit("Warning - wrong command line parameters.")
elif sys.argv[1].lower() not in ["png", "bmp", "csv"]:
    print_help()
    print ("This file type is not supported: ", sys.argv[1])
    sys.exit("ERROR")

file_format = sys.argv[1].lower()

# Read IP
if len(sys.argv) > 1:
    IP_DS1104Z = sys.argv[2]

# Check network response (ping)
if platform.system() == "Windows":
    response = os.system("ping -n 1 " + IP_DS1104Z + " > nul")
else:
    response = os.system("ping -c 1 " + IP_DS1104Z + " > /dev/null")

if response != 0:
    print ()
    print ("WARNING! No response pinging " + IP_DS1104Z)
    print ("Check network cables and settings.")
    print ("You should be able to ping the oscilloscope.")

# Open a modified telnet session
# The default telnetlib drops 0x00 characters,
#   so a modified library 'telnetlib_receive_all' is used instead
tn = Telnet(IP_DS1104Z, port)
instrument_id = command(tn, "*IDN?").decode()    # ask for instrument ID

# Check if instrument is set to accept LAN commands
if instrument_id == "command error":
    print ("Instrument reply:", instrument_id)
    print ("Check the oscilloscope settings.")
    print ("Utility -> IO Setting -> RemoteIO -> LAN must be ON")
    sys.exit("ERROR")

# Check if instrument is indeed a Rigol DS1000Z series
id_fields = instrument_id.split(",")
if (id_fields[company] != "RIGOL TECHNOLOGIES") or \
        (id_fields[model][:3] != "DS1") or (id_fields[model][-1] != "Z"):
    print ("Found instrument model '{}' from '{}'".format(id_fields[model], id_fields[company]))
    print ("WARNING: No Rigol from series DS1000Z found at", IP_DS1104Z)
    print ()
    typed = raw_input("ARE YOU SURE YOU WANT TO CONTINUE? (No/Yes):")
    if typed != 'Yes':
        sys.exit('Nothing done. Bye!')

print ("Instrument ID:", instrument_id)

# Prepare filename as C:\MODEL_SERIAL_YYYY-MM-DD_HH.MM.SS
timestamp = time.strftime("%Y-%m-%d_%H.%M.%S", time.localtime())
if len(sys.argv) > 3:
    filename = sys.argv[3]
else:
    filename = path_to_save + id_fields[model] + "_" + id_fields[serial] + "_" + timestamp + "." + file_format

if file_format in ["png", "bmp"]:
    # Ask for an oscilloscope display print screen
    print ("Receiving screen capture...")

    if file_format == "png":
    	buff = command(tn, ":DISP:DATA? ON,OFF,PNG")
    else:
    	buff = command(tn, ":DISP:DATA? ON,OFF,BMP8")

    expectedBuffLen = expected_buff_bytes(buff)
    # Just in case the transfer did not complete in the expected time, read the remaining 'buff' chunks
    while len(buff) < expectedBuffLen:
        logging.warning("Received LESS data then expected! (" +
                        str(len(buff)) + " out of " + str(expectedBuffLen) + " expected 'buff' bytes.)")
        tmp = tn.read_until(b"\n", smallWait)
        if len(tmp) == 0:
            break
        buff += tmp
        logging.warning(str(len(tmp)) + " leftover bytes added to 'buff'.")

    if len(buff) < expectedBuffLen:
        logging.error("After reading all data chunks, 'buff' is still shorter then expected! (" +
                      str(len(buff)) + " out of " + str(expectedBuffLen) + " expected 'buff' bytes.)")
        sys.exit("ERROR")

    # Strip TMC Blockheader and keep only the data
    tmcHeaderLen = tmc_header_bytes(buff)
    expectedDataLen = expected_data_bytes(buff)
    buff = buff[tmcHeaderLen: tmcHeaderLen+expectedDataLen]

    # Write raw data to file
    with open(filename, 'wb') as f:
    	f.write(buff)
    print('Saved raw data to {}'.format(filename))

# TODO: Change WAV:FORM from ASC to BYTE
elif file_format == "csv":
    # Put the scope in STOP mode - for the moment, deal with it by manually stopping the scope
    # TODO: Add command line switch and code logic for 1200 vs ALL memory data points
    # tn.write("stop")
    # response = tn.read_until("\n", 1)

    # Scan for displayed channels
    chanList = []
    for channel in ["CHAN1", "CHAN2", "CHAN3", "CHAN4", "MATH"]:
        response = command(tn, ":" + channel + ":DISP?")

        # If channel is active
        if response == '1\n':
            chanList += [channel]

    # the meaning of 'max' is   - will read only the displayed data when the scope is in RUN mode,
    #                             or when the MATH channel is selected
    #                           - will read all the acquired data points when the scope is in STOP mode
    # TODO: Change mode to MAX
    # TODO: Add command line switch for MAX/NORM
    command(tn, ":WAV:MODE NORM")
    command(tn, ":WAV:STAR 0")
    command(tn, ":WAV:MODE NORM")

    csv_buff = ""

    # for each active channel
    for channel in chanList:
        print ()

        # Set WAVE parameters
        command(tn, ":WAV:SOUR " + channel)
        command(tn, ":WAV:FORM ASC")

        # MATH channel does not allow START and STOP to be set. They are always 0 and 1200
        if channel != "MATH":
            command(tn, ":WAV:STAR 1")
            command(tn, ":WAV:STOP 1200")

        buff = ""
        print ("Data from channel '" + str(channel) + "', points " + str(1) + "-" + str(1200) + ": Receiving...")
        buffChunk = command(tn, ":WAV:DATA?")

        # Just in case the transfer did not complete in the expected time
        while buffChunk[-1] != "\n":
            logging.warning("The data transfer did not complete in the expected time of " +
                            str(smallWait) + " second(s).")

            tmp = tn.read_until(b"\n", smallWait)
            if len(tmp) == 0:
                break
            buffChunk += tmp
            logging.warning(str(len(tmp)) + " leftover bytes added to 'buff_chunks'.")

        # Append data chunks
        # Strip TMC Blockheader and terminator bytes
        buff += buffChunk[tmc_header_bytes(buffChunk):-1] + ","

        # Strip the last \n char
        buff = buff[:-1]

        # Process data
        buff_list = buff.split(",")
        buff_rows = len(buff_list)

        # Put read data into csv_buff
        csv_buff_list = csv_buff.split(os.linesep)
        csv_rows = len(csv_buff_list)

        current_row = 0
        if csv_buff == "":
            csv_first_column = True
            csv_buff = str(channel) + os.linesep
        else:
            csv_first_column = False
            csv_buff = str(csv_buff_list[current_row]) + "," + str(channel) + os.linesep

        for point in buff_list:
            current_row += 1
            if csv_first_column:
                csv_buff += str(point) + os.linesep
            else:
                if current_row < csv_rows:
                    csv_buff += str(csv_buff_list[current_row]) + "," + str(point) + os.linesep
                else:
                    csv_buff += "," + str(point) + os.linesep

    # Save data as CSV
    scr_file = open(filename, "wb")
    scr_file.write(csv_buff)
    scr_file.close()

    print ("Saved file:", "'" + filename + "'")

tn.close()