ESP stuff rüberkopiert

.gitignore

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

.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"
+    ]
+}

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

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

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:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+lib_deps = 
+	olikraus/U8g2@^2.36.15
+monitor_speed = 115200
+debug_tool = esp-prog
+debug_port = COM3

src/Display.cpp

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+#include <Display.h>
+#include <algorithm>
+
+Display::Display(uint8_t clockPin, uint8_t dataPin)
+    : u8g2(U8G2_R0, clockPin, dataPin, U8X8_PIN_NONE)
+{
+}
+
+Display::~Display()
+{
+}
+
+void Display::init()
+{
+    u8g2.begin();
+    u8g2.setFont(u8g2_font_7x14B_tr);
+}
+
+void Display::drawText(const std::string text)
+{
+    u8g2.clearBuffer();
+    u8g2.setFont(u8g2_font_7x14B_tr);
+
+    uint8_t charHeight = u8g2.getMaxCharHeight();
+
+    std::vector<std::string> textGrid;
+    splitText(text, &textGrid);
+
+    for (uint i = 0; i < textGrid.size(); i++)
+    {
+        if (textGrid.at(i).empty())
+            continue;
+
+        u8g2.drawStr(0, (i + 1) * charHeight, textGrid.at(i).c_str());
+    }
+
+    u8g2.sendBuffer();
+}
+
+void Display::splitText(const std::string text, std::vector<std::string> *out)
+{
+    if (out->empty())
+        out->push_back("");
+
+    uint8_t row = 0;
+    for (uint i = 0; i < text.length(); i++)
+    {
+        std::string added = out->at(row) + text[i];
+        if (u8g2.getStrWidth(added.c_str()) > u8g2.getWidth())
+        {
+            row++;
+            out->push_back("");
+            added = text[i];
+        }
+
+        out->at(row) = added;
+    }
+}

src/Display.h

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+#include <Arduino.h>
+#include <Wire.h>
+#include <U8g2lib.h>
+#include <vector>
+#include <string>
+
+class Display
+{
+private:
+    U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2;
+
+public:
+    Display(uint8_t clockPin = 12, uint8_t dataPin = 14);
+    virtual ~Display();
+
+    void init();
+    void drawText(const std::string text);
+
+private:
+    void splitText(const std::string text, std::vector<std::string> *out);
+};

src/main.cpp

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+#include <Arduino.h>
+#include <Wire.h>
+#include <U8g2lib.h>
+#include <Display.h>
+
+Display display;
+
+void setup()
+{
+  Serial.begin(115200);
+  display.init();
+}
+
+void loop()
+{
+  display.drawText("Das ist ein etwas längerer Test");
+  delay(1000);
+}

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