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Hector van der Aa
2026-05-27 08:44:49 +02:00
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.pio
.vscode
test
*.code-workspace

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This directory is intended for project header files.
A header file is a file containing C declarations and macro definitions
to be shared between several project source files. You request the use of a
header file in your project source file (C, C++, etc) located in `src` folder
by including it, with the C preprocessing directive `#include'.
```src/main.c
#include "header.h"
int main (void)
{
...
}
```
Including a header file produces the same results as copying the header file
into each source file that needs it. Such copying would be time-consuming
and error-prone. With a header file, the related declarations appear
in only one place. If they need to be changed, they can be changed in one
place, and programs that include the header file will automatically use the
new version when next recompiled. The header file eliminates the labor of
finding and changing all the copies as well as the risk that a failure to
find one copy will result in inconsistencies within a program.
In C, the convention is to give header files names that end with `.h'.
Read more about using header files in official GCC documentation:
* Include Syntax
* Include Operation
* Once-Only Headers
* Computed Includes
https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

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This directory is intended for project specific (private) libraries.
PlatformIO will compile them to static libraries and link into the executable file.
The source code of each library should be placed in a separate directory
("lib/your_library_name/[Code]").
For example, see the structure of the following example libraries `Foo` and `Bar`:
|--lib
| |
| |--Bar
| | |--docs
| | |--examples
| | |--src
| | |- Bar.c
| | |- Bar.h
| | |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
| |
| |--Foo
| | |- Foo.c
| | |- Foo.h
| |
| |- README --> THIS FILE
|
|- platformio.ini
|--src
|- main.c
Example contents of `src/main.c` using Foo and Bar:
```
#include <Foo.h>
#include <Bar.h>
int main (void)
{
...
}
```
The PlatformIO Library Dependency Finder will find automatically dependent
libraries by scanning project source files.
More information about PlatformIO Library Dependency Finder
- https://docs.platformio.org/page/librarymanager/ldf.html

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; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:megaatmega2560]
platform = atmelavr
board = megaatmega2560
framework = arduino

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// Copyright (C) 2026 Pierre Barbier <pierrebarbier741@gmail.com>
// Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
// SPDX-License-Identifier: GPL-3.0-or-later
#include <Arduino.h>
#define PIN_REG 2
#define PIN_SYNC 3
#define REG_SIZE 256
#define SYNC_SIZE 256
uint32_t REG_BUFF[REG_SIZE];
uint32_t SYNC_BUFF[SYNC_SIZE];
volatile uint8_t REG_IR = 0;
volatile uint8_t REG_IW = 0;
volatile uint8_t SYNC_IR = 0;
volatile uint8_t SYNC_IW = 0;
void append_buff_reg();
void append_buff_sync();
void setup() {
Serial.begin(115200);
attachInterrupt(digitalPinToInterrupt(PIN_REG), append_buff_reg, FALLING);
attachInterrupt(digitalPinToInterrupt(PIN_SYNC), append_buff_sync, FALLING);
}
void loop() {
if (Serial.availableForWrite() >= 5) {
if (REG_IW != REG_IR) {
Serial.write('R');
Serial.write((uint8_t *)&REG_BUFF[REG_IR], sizeof(uint32_t));
REG_IR++;
}
if (SYNC_IW != SYNC_IR) {
Serial.write('S');
Serial.write((uint8_t *)&SYNC_BUFF[SYNC_IR], sizeof(uint32_t));
SYNC_IR++;
}
}
}
void append_buff_reg() {
REG_BUFF[REG_IW] = micros();
REG_IW++;
}
void append_buff_sync() {
SYNC_BUFF[SYNC_IW] = micros();
SYNC_IW++;
}

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License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

11
Python/.gitignore vendored Normal file
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# Python-generated files
__pycache__/
*.py[oc]
build/
dist/
wheels/
*.egg-info
# Virtual environments
.venv
recordings/

1
Python/.python-version Normal file
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@@ -0,0 +1 @@
3.14

226
Python/main.py Normal file
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# Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
# Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import annotations
import csv
import queue
import struct
import sys
import threading
from dataclasses import dataclass
from datetime import datetime
from pathlib import Path
import serial
from serial.tools import list_ports
BAUD_RATE = 115_200
VALID_CHANNELS = frozenset((b"R", b"S"))
@dataclass(frozen=True)
class Sample:
channel: str
value: int
class SerialReader(threading.Thread):
def __init__(
self,
port: str,
recorder: RecorderState,
errors: queue.Queue[str],
stop_event: threading.Event,
) -> None:
super().__init__(daemon=True)
self.port = port
self.recorder = recorder
self.errors = errors
self.stop_event = stop_event
def run(self) -> None:
try:
with serial.Serial(self.port, BAUD_RATE, timeout=0.1) as ser:
ser.reset_input_buffer()
while not self.stop_event.is_set():
channel = ser.read(1)
if not channel:
continue
if channel not in VALID_CHANNELS:
continue
payload = ser.read(4)
if len(payload) != 4:
continue
value = struct.unpack("<I", payload)[0]
self.recorder.write(Sample(channel.decode("ascii"), value))
except serial.SerialException as exc:
self.errors.put(f"Serial error: {exc}")
class Recording:
def __init__(self, output_dir: Path) -> None:
started_at = datetime.now().strftime("%Y%m%d_%H%M%S")
output_dir.mkdir(parents=True, exist_ok=True)
self.files = {
"R": (output_dir / f"{started_at}_R.csv").open(
"w", newline="", buffering=1024 * 1024
),
"S": (output_dir / f"{started_at}_S.csv").open(
"w", newline="", buffering=1024 * 1024
),
}
self.writers = {
channel: csv.writer(file) for channel, file in self.files.items()
}
self.counts = {"R": 0, "S": 0}
@property
def paths(self) -> list[Path]:
return [Path(file.name) for file in self.files.values()]
def write(self, sample: Sample) -> None:
self.writers[sample.channel].writerow((sample.value,))
self.counts[sample.channel] += 1
def close(self) -> None:
for file in self.files.values():
file.close()
class RecorderState:
def __init__(self, output_dir: Path) -> None:
self.output_dir = output_dir
self.recording: Recording | None = None
self.lock = threading.Lock()
def start(self) -> Recording | None:
with self.lock:
if self.recording is not None:
return None
self.recording = Recording(self.output_dir)
return self.recording
def stop(self) -> Recording | None:
with self.lock:
if self.recording is None:
return None
recording = self.recording
self.recording = None
recording.close()
return recording
def write(self, sample: Sample) -> None:
with self.lock:
if self.recording is not None:
self.recording.write(sample)
def choose_port() -> str | None:
ports = list(list_ports.comports())
if not ports:
print("No serial ports found.")
return None
print("Available serial ports:")
for index, port in enumerate(ports, start=1):
description = port.description or "serial port"
print(f" {index}. {port.device} - {description}")
while True:
choice = input("Choose a port number, or q to quit: ").strip().lower()
if choice == "q":
return None
try:
index = int(choice)
except ValueError:
print("Please enter a port number.")
continue
if 1 <= index <= len(ports):
return ports[index - 1].device
print(f"Please choose a number between 1 and {len(ports)}.")
def show_recording_summary(recording: Recording) -> None:
print(
"Stopped recording: "
f"{recording.counts['R']} R samples, {recording.counts['S']} S samples"
)
for path in recording.paths:
print(f" {path}")
def main() -> int:
port = choose_port()
if port is None:
return 0
errors: queue.Queue[str] = queue.Queue()
stop_event = threading.Event()
recorder = RecorderState(Path("recordings"))
reader = SerialReader(port, recorder, errors, stop_event)
reader.start()
print(f"Reading {port} at {BAUD_RATE} baud.")
print("Commands: r = record, s = stop recording, q = quit")
try:
while True:
try:
error = errors.get_nowait()
except queue.Empty:
error = None
if error is not None:
print(error)
return 1
command = input("> ").strip().lower()
if command == "r":
recording = recorder.start()
if recording is None:
print("Already recording.")
continue
print("Recording to:")
for path in recording.paths:
print(f" {path}")
elif command == "s":
recording = recorder.stop()
if recording is None:
print("Not recording.")
continue
show_recording_summary(recording)
elif command == "q":
recording = recorder.stop()
if recording is not None:
show_recording_summary(recording)
return 0
elif command:
print("Unknown command. Use r, s, or q.")
except KeyboardInterrupt:
print()
recording = recorder.stop()
if recording is not None:
show_recording_summary(recording)
return 130
finally:
stop_event.set()
reader.join(timeout=1.0)
if __name__ == "__main__":
sys.exit(main())

9
Python/pyproject.toml Normal file
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[project]
name = "engine-recorder-dump"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.14"
dependencies = [
"pyserial>=3.5",
]

23
Python/uv.lock generated Normal file
View File

@@ -0,0 +1,23 @@
version = 1
revision = 3
requires-python = ">=3.14"
[[package]]
name = "engine-recorder-dump"
version = "0.1.0"
source = { virtual = "." }
dependencies = [
{ name = "pyserial" },
]
[package.metadata]
requires-dist = [{ name = "pyserial", specifier = ">=3.5" }]
[[package]]
name = "pyserial"
version = "3.5"
source = { registry = "https://pypi.org/simple" }
sdist = { url = "https://files.pythonhosted.org/packages/1e/7d/ae3f0a63f41e4d2f6cb66a5b57197850f919f59e558159a4dd3a818f5082/pyserial-3.5.tar.gz", hash = "sha256:3c77e014170dfffbd816e6ffc205e9842efb10be9f58ec16d3e8675b4925cddb", size = 159125, upload-time = "2020-11-23T03:59:15.045Z" }
wheels = [
{ url = "https://files.pythonhosted.org/packages/07/bc/587a445451b253b285629263eb51c2d8e9bcea4fc97826266d186f96f558/pyserial-3.5-py2.py3-none-any.whl", hash = "sha256:c4451db6ba391ca6ca299fb3ec7bae67a5c55dde170964c7a14ceefec02f2cf0", size = 90585, upload-time = "2020-11-23T03:59:13.41Z" },
]

2
README.md Normal file
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# Engine Recorder
Engine recorder is a simple interrupt driven Arduino program that dumps `micros()` timestamps over serial for two inputs, these are collected on a computer by a python program that saves these as CSV files