Logic Analyzer

TMK signal capture firmware

https://github.com/tmk/tmk_keyboard/wiki/Signal-Capture-for-debug

Soarer's Logic Analyer

https://deskthority.net/viewtopic.php?f=7&t=4567

This is a script that converters its outputs into VCD format. VCD file can be viewed in PulseView.

#!/usr/bin/python3
# -*- Mode: Python; coding: utf-8; indent-tabs-mode: nil; tab-width: 4 -*-
#
# Converts Soarer's Logic Analyzer output into VCD format
#     https://deskthority.net/viewtopic.php?t=4567
#
# 'sctrace' record is comprised of seven hex characters(0-9A-F):
#     time: 4 chars/2 bytes; timestamp of event
#     stat: 2 chars/1 byte;  port state
#     flag: 1 char /4 bits;  timer event(1) or port state change event(0)

import sys

# https://github.com/westerndigitalcorporation/pyvcd
from vcd import VCDWriter

if len(sys.argv) == 2:
    file = open(sys.argv[1])
else:
    file = sys.stdin
    print(f"Usage: {sys.argv[0]} [infile]", file=sys.stderr)
    print('or give data into stdin. Reading from stdin...', file=sys.stderr);

# write VCD
from datetime import datetime, timezone
with VCDWriter(sys.stdout, timescale='1 us', date=datetime.now(timezone.utc).ctime()) as writer:

    # prams: scope, name, var_type, size
    port = writer.register_var('sctrace', 'port', 'wire', size=8)

    # read 'sctrace' output file
    ext_time = 0
    for line in file:
        for record in line.strip().split():
            if len(record) == 7:
                time = int(record[0:4], 16)
                stat = int(record[4:6], 16)
                flag = int(record[6:7], 16)

                # timer overflow when flag == 1
                if flag:
                    ext_time += 1

                # time: 1/16 us(62.5 ns) per tick(@16MHz+Prescaler:1)
                writer.change(port, ((ext_time * 0x10000) + time)/16, stat)

Other Resources

Arduino sketch and Processing client

https://create.arduino.cc/projecthub/vincenzo-g/diy-logic-analyzer-f61ee5

Arduino sketch and client on browser with HTML5 and JavaScript

https://www.instructables.com/id/Arduinolyzerjs-Turn-your-Arduino-into-a-Logic-Anal/

Arduino sketch that suppors SUMP protocol

https://hackaday.io/project/1633-arduino-generic-logic-analyzer

https://github.com/gillham/logic_analyzer

https://www.element14.com/community/people/jancumps/blog/2015/03/13/make-a-logic-analyzer-from-your-dev-kit-part-1-arduino-uno

SUMP protocol

https://www.sump.org/projects/analyzer/protocol/

SUMP client

https://www.lxtreme.nl/ols/

sigrok Pulse View

https://sigrok.org/wiki/PulseView

sigrok fx2lafw

http://sigrok.org/wiki/Fx2lafw