raspikeyer/src/settings.h

#ifndef SETTINGS_H
#define SETTINGS_H

#include "pico/flash.h"

const uint16_t MAGIC_NUMBER = 2;

enum class Mode : uint8_t {
    IAMBIC_A = 0,
    IAMBIC_B,
};

struct Settings {
    uint16_t magic_number{MAGIC_NUMBER};   // Bytes:  2
    Mode mode{Mode::IAMBIC_B};             // Bytes:  1
    uint8_t wpm{18};                       // Bytes:  1
    uint8_t dummy[FLASH_PAGE_SIZE - 4]{0}; // Sum  :  4
};

void store_settings(Settings &settings);
Settings read_settings();

#endif