Python Script to convert Flipper RAW .sub file to a Basic VCD Value Change Dump format

sub2vcd.py

#!/usr/bin/env python

#    Flipper RAW .sub format
#    
#    Having a look at some of the code in lib/subghz/protocols/raw.c
#    - Decoded data is stored as a line starting with the text "Raw_Data: " followed by space delimited integers.
#    - Each line stores a maximum number of integers limited to SUBGHZ_DOWNLOAD_MAX_SIZE ,defined as 512. Then a new line is written.
#    - The sign of each integer represents a decoded signal logic level, positive / negative , logic level 1 / 0
#    - The absolute value of each integer represents the signal level duration. I am guessing this is in micro-seconds


# From a captured Flipper RAW .sub file to a Basic VCD Value Change Dump
# this format can then be opened and viewed in 
#   - GTKWave : http://gtkwave.sourceforge.net/
#   - Sigroks PulseView : https://sigrok.org/wiki/PulseView#Download
#
#  Usage : ./sub2vcd.py input.sub > output.vcd
#      You can "trim" decoded section by modifying starttime and endtime variables they are in micro-seconds
#
#   Inspired by jinscho's gist :
#    https://gist.github.com/jinschoi/8396f25a4cb7ac7986a7d881026ae950
#  2022/07/28 : Initial version with plenty of room for improvement

import re
import sys
import math

filename = sys.argv[1]

starttime = 0
endtime   = -1

myaccutime = 0
myiv = -1

def initwrite(ival):
    print("$date\r\n"
    "   Date text. For example: November 11, 2009.\r\n"
    "$end\r\n"
    "$version\r\n"
    "   VCD generator tool version info text.\r\n"
    "$end\r\n"
    "$comment\r\n"
    "   Any comment text.\r\n"
    "$end\r\n"
    "$timescale 1 us $end\r\n"
    "$scope module logic $end\r\n"
    "$var wire 1 * rawdata $end\r\n"
    "$upscope $end\r\n"
    "$enddefinitions $end\r\n"
    "$dumpvars\r\n"
    "x*\r\n"
    "$end\r\n"
    "#0")

def addtime(seg):
    global myaccutime
    myaccutime += abs(seg)
    return myaccutime

segs = []
with open(filename, 'r') as f:
    for line in f:
        m = re.match(r'RAW_Data:\s*([-0-9 ]+)\s*$', line)
        if m:
            mysegs = m[1].split(r' ')
            if (myiv == -1):
                myiv = 0 if int(mysegs[0])<0 else 1
                if endtime > 0:
                    myiv = abs(myiv-1)
                initwrite(myiv)
            for seg in mysegs:
                myte = addtime(int(seg))
                if endtime > 0:
                    if myaccutime < endtime and myaccutime > starttime:
                        segs.extend([myte-starttime])
                    else:
                        myiv = abs(myiv-1)
                else:
                    segs.extend([myte])
    if m and endtime > 0:
        segs.extend([endtime-starttime])

full = []
for seg in segs:
    if myiv == 1:
        full.append('1*\r\n')
        myiv = 0
    else:
        full.append('0*\r\n')
        myiv = 1
    full.append('#'+str(seg)+'\r\n')

full = ''.join(full)

print(full)

Attempting to run this with Python3, kicks the following error:

user@host sub2vcd % ./sub2vcd.py sample.sub > out.sub

Traceback (most recent call last):
File "./sub2vcd.py", line 66, in
mysegs = m[1].split(r' ')
TypeError: '_sre.SRE_Match' object has no attribute 'getitem'

Sorry regex is not my forte.