Initial commit

Arduino/.gitignore

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+.pio
+.vscode
+test
+*.code-workspace

Arduino/include/README

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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

Arduino/lib/README

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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

Arduino/platformio.ini

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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

Arduino/src/main.cpp

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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++;
+}