[+] Libraries

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/PN532"]
+	path = lib/PN532-repo
+	url = https://github.com/Seeed-Studio/PN532/

include/README

@@ -0,0 +1,39 @@
+
+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/PN532

@@ -0,0 +1 @@
+PN532-repo/PN532

lib/PN532_I2C

@@ -0,0 +1 @@
+PN532-repo/PN532_I2C

lib/README

@@ -0,0 +1,46 @@
+
+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

src/main.cpp

@@ -14,7 +14,7 @@ PN532 nfc(pn532i2c);
 uint8_t        _prevIDm[8];
 unsigned long  _prevTime;
 
-void setup(void)
+void setup()
 {
   delay(1000);
   Serial.begin(115200);
@@ -44,7 +44,16 @@ void setup(void)
   memset(_prevIDm, 0, 8);
 }
 
-void loop(void)
+void printUid(uint8_t* uid, uint8_t uidLength) {
+  Serial.print("UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
+  Serial.print("UID Value: ");
+  for (uint8_t i = 0; i < uidLength; i++) {
+    Serial.print(uid[i], HEX);
+  }
+  Serial.println("");
+}
+
+void loop()
 {
   uint8_t ret;
   uint16_t systemCode = 0xFFFF;
@@ -73,7 +82,7 @@ void loop(void)
     _prevTime = millis();
     return;
   }
-  
+
   Serial.print("M");
   uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 }; // Buffer to store the returned UID
   uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
@@ -93,12 +102,3 @@ void loop(void)
     return;
   }
 }
-
-void printUid(uint8_t* uid, uint8_t uidLength) {
-  Serial.print("UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
-  Serial.print("UID Value: ");
-  for (uint8_t i = 0; i < uidLength; i++) {
-    Serial.print(uid[i], HEX);
-  }
-  Serial.println("");
-}

test/README

@@ -0,0 +1,11 @@
+
+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