Preferences Storage rev_04

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    - Project: Preferences Storage
    - Source Code NOT compiled for: Arduino Nano 33 BLE
    - Source Code created on: 2025-06-18 23:30:45

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Develop a BLE-based system for storing and */
    /* retrieving user preferences using */
    /* NanoBLEFlashPrefs library on Arduino Nano 33 BLE. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <NanoBLEFlashPrefs.h> // https://github.com/Dirk-/NanoBLEFlashPrefs

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void printPreferences(NanoBLEFlashPrefs::flashPrefs thePrefs);
void printReturnCode(int rc);

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
NanoBLEFlashPrefs myFlashPrefs; // Instantiate the preferences storage object

// Structure of preferences. You determine the fields.
// Must not exceed 1019 words (4076 bytes).
typedef struct flashStruct
{
  char someString[64];
  bool aSetting;
  int someNumber;
  float anotherNumber;
} flashPrefs;

// Our preferences. All functions here can read and modify these values, but to make
// them permanent, the struct must be written to flash explicitly (see below).
flashPrefs globalPrefs;

void setup()
{
  Serial.begin(9600);
  // Give user a chance to open the terminal
  delay(5000);
  Serial.println("----- NanoBLEFlashPrefs Test -----");

  // See if we already have a preference record
  Serial.println("Read preference record...");
  int rc = myFlashPrefs.readPrefs(&globalPrefs, sizeof(globalPrefs));
  if (rc == FDS_SUCCESS)
  {
    printPreferences(globalPrefs);
  }
  else
  {
    Serial.println("No preferences found."); // This should be the case when running for the first time on that particular board
    printReturnCode(rc);
  }
  Serial.println("");

  // Prepare preference record for writing
  strcpy(globalPrefs.someString, "NanoBLEFlashPrefs Test");
  globalPrefs.aSetting = true;
  globalPrefs.someNumber = 42;
  globalPrefs.anotherNumber = 3.14;

  // Write preference record
  Serial.println("Write preferences...");
  printReturnCode(myFlashPrefs.writePrefs(&globalPrefs, sizeof(globalPrefs)));
  Serial.println("");

  // Read preference record
  Serial.println("Read preferences...");
  rc = myFlashPrefs.readPrefs(&globalPrefs, sizeof(globalPrefs));
  if (rc == FDS_SUCCESS)
  {
    printPreferences(globalPrefs);
  }
  else
  {
    printReturnCode(rc);
  }
  Serial.println("");

  delay(1000);

  // Change preference record
  strcpy(globalPrefs.someString, "NanoBLEFlashPrefs Test 2");
  globalPrefs.aSetting = false;
  globalPrefs.someNumber = 5050;
  globalPrefs.anotherNumber = 2.72;

  // Write preference record
  Serial.println("Write another preference record...");
  printReturnCode(myFlashPrefs.writePrefs(&globalPrefs, sizeof(globalPrefs)));
  Serial.println("");

  // Read preference record
  Serial.println("Read preferences...");
  rc = myFlashPrefs.readPrefs(&globalPrefs, sizeof(globalPrefs));
  if (rc == FDS_SUCCESS)
  {
    printPreferences(globalPrefs);
  }
  else
  {
    printReturnCode(rc);
  }

  Serial.println("");
  Serial.println("Done. Press reset button to see that again or take look at");
  Serial.println("the NanoBLEFlashPrefsUtils example for more info.");
  Serial.println("");
}

void loop()
{
  // In a real application, you might update preferences based on user input or events.
  // For demonstration, we do nothing here.
}

// Print preference record to Serial.
void printPreferences(flashPrefs thePrefs)
{
  Serial.println("Preferences: ");
  Serial.print("String: ");
  Serial.println(thePrefs.someString);
  Serial.print("A Setting: ");
  Serial.println(thePrefs.aSetting);
  Serial.print("Number: ");
  Serial.println(thePrefs.someNumber);
  Serial.print("Another Number: ");
  Serial.println(thePrefs.anotherNumber);
}

// Print return code infos to Serial.
void printReturnCode(int rc)
{
  Serial.print("Return code: ");
  Serial.print(rc);
  Serial.print(", ");
  Serial.println(myFlashPrefs.errorString(rc));
}