Initialized

.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:nano_33_iot]
+platform = atmelsam
+board = nano_33_iot
+framework = arduino

src/main.cpp

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+#include <Arduino.h>
+
+int USER_STEPS = 5;
+int STAFF_STEPS = 25;
+
+int maxVolume = 100;
+int userVolume = 100;
+int potPosition = 64;
+int oldUserVolume = userVolume;
+
+void volumeUp();
+void volumeDown();
+
+void setup()
+{
+  pinMode(11, OUTPUT);          // Green
+  pinMode(12, OUTPUT);          // Red LED (D4)
+  pinMode(LED_BUILTIN, OUTPUT); // Green LED
+
+  pinMode(2, INPUT); // SW1
+  pinMode(4, INPUT); // SW2
+
+  // RF Receiver
+  pinMode(A0, INPUT); // Remote Button D
+  pinMode(A1, INPUT); // Remote Button C
+  pinMode(A2, INPUT); // Remote Button B
+  pinMode(A3, INPUT); // Remote Button A
+
+  pinMode(10, OUTPUT); // D10 - CS
+  pinMode(9, OUTPUT);  // D9 - U/D
+  digitalWrite(10, HIGH);
+  digitalWrite(9, LOW);
+
+  for (int i = 0; i < 64; i++)
+  {
+    volumeUp();
+  }
+}
+
+void loop()
+{
+  switch (maxVolume)
+  {
+  case 100:
+    digitalWrite(11, HIGH);
+    digitalWrite(12, LOW);
+    digitalWrite(LED_BUILTIN, LOW);
+    break;
+  case 75:
+    digitalWrite(11, LOW);
+    digitalWrite(12, HIGH);
+    digitalWrite(LED_BUILTIN, LOW);
+    break;
+  case 50:
+    digitalWrite(11, LOW);
+    digitalWrite(12, LOW);
+    digitalWrite(LED_BUILTIN, HIGH);
+    break;
+  case 25:
+    digitalWrite(11, HIGH);
+    digitalWrite(12, HIGH);
+    digitalWrite(LED_BUILTIN, HIGH);
+    break;
+  }
+
+  // SW1 - Staff Volume Up
+  if (!digitalRead(2))
+  {
+    if (maxVolume < 100)
+    {
+      maxVolume += STAFF_STEPS;
+      delay(300);
+    }
+  }
+
+  // SW2 - Staff Volume Down
+  if (!digitalRead(4))
+  {
+    if (maxVolume > 0)
+    {
+      maxVolume -= STAFF_STEPS;
+
+      if (userVolume > maxVolume)
+      {
+        userVolume = maxVolume;
+        oldUserVolume = userVolume;
+      }
+      delay(300);
+    }
+  }
+
+  // Remote D - Mute
+  if (digitalRead(A0))
+  {
+
+    // Check if we are in a muted state
+    if (oldUserVolume > userVolume)
+    {
+      if (oldUserVolume > maxVolume)
+      {
+        userVolume = maxVolume;
+      }
+      else
+      {
+        userVolume = oldUserVolume;
+      }
+    }
+    else
+    {
+      oldUserVolume = userVolume;
+      userVolume = 0;
+    }
+
+    delay(300);
+  }
+
+  // Remote A - Significantly Lower Volume
+  if (digitalRead(A3))
+  {
+    if (oldUserVolume > userVolume)
+    {
+      if (oldUserVolume > maxVolume)
+      {
+        userVolume = maxVolume;
+      }
+      else
+      {
+        userVolume = oldUserVolume;
+      }
+    }
+    else
+    {
+      oldUserVolume = userVolume;
+      userVolume = 15;
+    }
+
+    delay(300);
+  }
+
+  // Remote B - Volume Up
+  if (digitalRead(A2) && !(oldUserVolume > userVolume))
+  {
+    volumeUp();
+
+    if ((userVolume + USER_STEPS) > maxVolume)
+    {
+      userVolume = maxVolume;
+      oldUserVolume = userVolume;
+    }
+    else
+    {
+      userVolume += USER_STEPS;
+      oldUserVolume = userVolume;
+    }
+
+    delay(300);
+  }
+
+  // Remote C - Volume Down
+  if (digitalRead(A1) && !(oldUserVolume > userVolume))
+  {
+    volumeDown();
+
+    if ((userVolume - USER_STEPS) < 0)
+    {
+      userVolume = 0;
+      oldUserVolume = userVolume;
+    }
+    else
+    {
+      userVolume -= USER_STEPS;
+      oldUserVolume = userVolume;
+    }
+
+    delay(300);
+  }
+}
+
+void volumeUp()
+{
+  digitalWrite(9, HIGH);
+  delay(1);
+  digitalWrite(10, LOW);
+  delay(1);
+  digitalWrite(9, LOW);
+  delay(1);
+  digitalWrite(9, HIGH);
+  delay(1);
+  digitalWrite(10, HIGH);
+  delay(1);
+  digitalWrite(9, LOW);
+  digitalWrite(10, HIGH);
+}
+
+void volumeDown()
+{
+  digitalWrite(9, LOW);
+  delay(1);
+  digitalWrite(10, LOW);
+  delay(1);
+  digitalWrite(9, HIGH);
+  delay(1);
+  digitalWrite(9, LOW);
+  delay(1);
+  digitalWrite(10, HIGH);
+}

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