Scan working.

.gitignore

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+.pio
+.vscode/*

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:mzeroproUSB]
+platform = atmelsam
+board = mzeroproUSB
+framework = arduino
+monitor_speed = 115200

src/main.cpp

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+#include <Arduino.h>
+#include <Wire.h>
+
+void portScan();
+void magwhoami();
+
+void setup() {
+  SerialUSB.begin(115200);
+  Wire.begin();
+  delay(2000);
+  portScan();
+  magwhoami();
+
+}
+
+void loop() {
+
+}
+
+void portScan(){
+byte error, address;
+  int nDevices;
+
+  SerialUSB.println("Scanning...");
+
+  nDevices = 0;
+  for(address = 1; address < 127; address++ )
+  {
+    // The i2c_scanner uses the return value of
+    // the Write.endTransmisstion to see if
+    // a device did acknowledge to the address.
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission();
+
+    if (error == 0)
+    {
+      SerialUSB.print("I2C device found at address 0x");
+      if (address<16)
+        SerialUSB.print("0");
+      SerialUSB.print(address,HEX);
+      SerialUSB.println("  !");
+
+      nDevices++;
+    }
+    else if (error==4)
+    {
+      SerialUSB.print("Unknown error at address 0x");
+      if (address<16)
+        SerialUSB.print("0");
+      SerialUSB.println(address,HEX);
+    }
+  }
+  if (nDevices == 0)
+    SerialUSB.println("No I2C devices found\n");
+  else
+    SerialUSB.println("done\n");
+
+}
+
+void magwhoami(){
+  Wire.beginTransmission(0x30);
+  Wire.write(0x39);
+  Wire.endTransmission();
+
+  Wire.requestFrom(0x30, 1);
+  if (Wire.available()){
+    SerialUSB.println(Wire.read());
+  }
+}

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