Init Shared Repo

.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"
+    ]
+}

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

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 a 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

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
+monitor_speed = 115200
+framework = arduino
+lib_deps = 
+	adafruit/Adafruit SSD1306@2.3.1
+	adafruit/Adafruit GFX Library@^1.10.0
+	adafruit/Adafruit BusIO@^1.4.2

src/Works_SimpleTest_ESP32.cpp

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+/* JTR 2020-09-05: This works now; Some pointers:
+ *  1) The library must have changed and the first 2 parameters of the display constructor are width and height..
+ *  2) The default configuration seems to be that one hast to use the "HSPI" ports rather than the VSPI!
+ */ 
+
+#include <Arduino.h>
+#include <SPI.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+
+// Declaration for SSD1306 display connected using software SPI (default case):
+#define OLED_CLK   14 // OLED: D0
+#define OLED_MOSI  13 // OLED: D1
+#define OLED_RST   22 // OLED: RES
+#define OLED_DC    17 // (ESP32-"TX2") OLED: DC
+#define OLED_CS    23 // OLED: CS
+
+
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RST, OLED_CS);
+ 
+void setup() {
+
+  Serial.begin(115200);
+  delay(1250);
+  
+  Serial.println("GO!.");
+
+  if(!display.begin(SSD1306_SWITCHCAPVCC)) {
+    Serial.println(F("SSD1306 allocation failed"));
+    for(;;); // Don't proceed, loop forever
+  }
+
+
+  // Show initial display buffer contents on the screen --
+  // the library initializes this with an Adafruit splash screen.
+  display.clearDisplay();
+  display.display();
+
+  display.setTextSize(1);             // Normal 1:1 pixel scale
+  display.setTextColor(SSD1306_WHITE);        // Draw white text
+  display.setCursor(0,0);             // Start at top-left corner
+  display.println(F("Starting..."));
+  display.display();
+  delay(1000);
+}
+
+int i=1; 
+void loop() {
+  display.clearDisplay();
+
+  display.setTextSize(i++);             // Normal 1:1 pixel scale
+  display.setTextColor(SSD1306_WHITE);        // Draw white text
+  display.setCursor(0,0);             // Start at top-left corner
+  display.println(F("GroW"));
+  display.display();
+
+  if (i > 5) { i=1; }
+  delay(200);
+  Serial.println("GroW.");
+}

test/README

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+
+This directory is intended for PlatformIO Unit Testing 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/page/plus/unit-testing.html