V1 - Import Arduino

.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 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:nanoatmega168]
+platform = atmelavr
+board = nanoatmega168
+framework = arduino
+lib_deps = miguelbalboa/MFRC522@^1.4.10

src/main.cpp

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+#include <Arduino.h>
+#include <SPI.h>
+#include <MFRC522.h>
+
+#define RST_PIN         9          // Configurable, see typical pin layout above
+#define SS_1_PIN        10         // Configurable, take a unused pin, only HIGH/LOW required, must be different to SS 2
+
+MFRC522 mfrc522;   // Create MFRC522 instance.
+String SerialCMD;
+
+/**
+ * Helper routine to dump a byte array as hex values to Serial.
+ */
+void dump_byte_array(byte *buffer, byte bufferSize) {
+  for (byte i = 0; i < bufferSize; i++) {
+    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
+    Serial.print(buffer[i], HEX);
+  }
+}
+
+/**
+ * Initialize.
+ */
+void setup() {
+
+  Serial.begin(9600); // Initialize serial communications with the PC
+  while (!Serial);    // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
+
+  SPI.begin();        // Init SPI bus
+
+  mfrc522.PCD_Init(SS_1_PIN, RST_PIN); // Init each MFRC522 card
+  Serial.print(F("Reader "));
+  Serial.print(F(": "));
+  mfrc522.PCD_DumpVersionToSerial();
+}
+
+/**
+ * Main loop.
+ */
+void loop() {
+
+    if (Serial.available() > 0) {
+      SerialCMD = Serial.readString();
+      SerialCMD.trim();
+    }
+    
+    if ((mfrc522.PICC_IsNewCardPresent() || SerialCMD.startsWith("READ") ) && mfrc522.PICC_ReadCardSerial()) {
+      Serial.print(F("R#"));
+      // Show some details of the PICC (that is: the tag/card)
+      dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
+      Serial.print(F("#"));
+      MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
+      //Serial.println(mfrc522.PICC_GetTypeName(piccType));
+      Serial.print(piccType,HEX);
+      Serial.print(F("#"));
+      Serial.println(mfrc522.PICC_GetTypeName(piccType));
+
+      // Halt PICC
+      mfrc522.PICC_HaltA();
+      // Stop encryption on PCD
+      mfrc522.PCD_StopCrypto1();
+
+      //Reset SerialCMD
+      SerialCMD = "";
+    }
+}

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