Initial Commit

arduino/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

arduino/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

arduino/.vscode/settings.json

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+{
+    "cmake.configureOnOpen": false
+}

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 usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+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 executable file.
+
+The source code of each library should be placed in an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, 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
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries 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:esp32doit-devkit-v1]
+platform = espressif32
+board = esp32doit-devkit-v1
+framework = arduino
+upload_port = /dev/ttyUSB0
+monitor_speed = 115200

arduino/src/main.cpp

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+#include <Arduino.h>
+
+#define RXD2 16
+#define TXD2 17
+#define TIMEOUT 250
+#define MAX_TRIES 20
+
+uint16_t calculateChecksum(const uint8_t* data, size_t length) {
+  uint16_t sum = 0;
+  for (size_t i = 0; i < length; i++) {
+    sum += data[i];
+  }
+  uint16_t checksum = sum ^ 0xFFFF;
+  return (checksum & 0xFF) << 8 | (checksum >> 8);
+}
+
+bool verifyChecksum(const uint8_t* data, size_t length) {
+    if (length < 4) {  // Stellt sicher, dass genug Daten für eine Checksumme vorhanden sind
+        Serial.println("Datenlänge ist zu kurz für Checksummenüberprüfung.");
+        return false;
+    }
+    // Empfangene Checksumme aus den letzten zwei Bytes im Little-Endian Format
+    uint16_t received_checksum = (data[length-1] << 8) | data[length-2];
+
+    // Berechnet die Checksumme beginnend beim dritten Byte bis zum vorletzten Byte
+    uint16_t sum = 0;
+    for (size_t i = 2; i < length - 2; i++) {
+        sum += data[i];
+    }
+    uint16_t calculated_checksum = sum ^ 0xFFFF;
+    calculated_checksum = (calculated_checksum & 0xFF) << 8 | (calculated_checksum >> 8); // Byte-Swap
+
+    // Debug-Ausgaben
+    Serial.print("Received Checksum: ");
+    Serial.println(received_checksum, HEX);
+    Serial.print("Calculated Checksum: ");
+    Serial.println(calculated_checksum, HEX);
+
+    // Vergleicht die berechnete Checksumme mit der empfangenen
+    return received_checksum == calculated_checksum;
+}
+
+void processBmsResponse(const uint8_t* data, size_t length, uint8_t expectedCmd) {
+  for (int i = 0; i < length; i++) {
+    Serial.print(data[i], HEX); // Ausgeben jedes Bytes in Hexadezimal
+    Serial.print(" "); // Füge ein Leerzeichen zwischen den Hex-Werten ein
+  }
+  Serial.println(); // Füge eine neue Zeile am Ende hinzu
+
+
+  if (!verifyChecksum(data, length)) {
+    Serial.println("Checksumme ungültig!");
+    return;
+  }
+  if (data[5] != expectedCmd) { // Korrekt, data[4] sollte das bArg sein, das überprüft wird
+    Serial.print("Erwartetes Register (Hex): ");
+    Serial.println(expectedCmd, HEX); // Ausgabe in Hex
+    Serial.print("Erhaltenes Register (Hex): ");
+    Serial.println(data[5], HEX); // Ausgabe in Hex
+    Serial.println("Falsches Register in der Antwort.");
+    return;
+  }
+
+  Serial.println("Gültige Daten empfangen:");
+  for (int i = 7; i < length - 2; i += 2) {
+    uint16_t voltage = (data[i] << 8) | data[i+1];
+    Serial.print("Zellenspannung: ");
+    Serial.print(voltage);
+    Serial.println(" mV");
+  }
+}
+
+bool sendBmsCommand(uint8_t bLen, uint8_t bAddr, uint8_t bCmd, uint8_t bArg, uint8_t bPayload) {
+  uint8_t command[] = {0x55, 0xAA, bLen, bAddr, bCmd, bArg, bPayload};
+  uint16_t checksum = calculateChecksum(command + 2, sizeof(command) - 2);
+
+  for (int attempt = 0; attempt < MAX_TRIES; attempt++) {
+    Serial2.write(command, sizeof(command));
+    Serial2.write((uint8_t)(checksum >> 8));
+    Serial2.write((uint8_t)(checksum & 0xFF));
+
+    unsigned long startTime = millis();
+    while (Serial2.available() == 0) {
+      if (millis() - startTime >= TIMEOUT) {
+        Serial.println("Timeout erreicht, sende erneut...");
+        break;
+      }
+    }
+
+    if (Serial2.available() > 0) {
+      uint8_t response[256];
+      int index = 0;
+      while (Serial2.available() > 0 && index < 256) {
+        response[index++] = Serial2.read();
+      }
+      processBmsResponse(response, index, bArg); // Übergabe von bArg direkt in Hex
+      return true;
+    }
+  }
+
+  Serial.println("Maximale Versuche erreicht, keine Antwort.");
+  return false;
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2);
+  sendBmsCommand(0x03, 0x22, 0x01, 0x40, 0x14);  // bArg wird hier als Hex-Wert 0x40 übergeben, erwartet als Antwort auch 0x40
+}
+
+void loop() {
+}

arduino/test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html