raspikeyer/settings.cpp

#include <cstring>

#include "settings.h"

namespace
{
    constexpr const uint32_t FLASH_TARGET_OFFSET = PICO_FLASH_SIZE_BYTES - FLASH_SECTOR_SIZE;
    const uint8_t *flash_target_contents = (const uint8_t *) (XIP_BASE + FLASH_TARGET_OFFSET);
}

void flash_store_callback(void *settings)
{
    int writeSize = (sizeof(struct Settings) / FLASH_PAGE_SIZE) + 1;

    flash_range_erase(FLASH_TARGET_OFFSET, FLASH_SECTOR_SIZE);
    flash_range_program(FLASH_TARGET_OFFSET, reinterpret_cast<uint8_t *>(settings), FLASH_PAGE_SIZE * writeSize);
}

void store_settings(Settings &settings)
{
    uint8_t *settingsAsBytes = reinterpret_cast<uint8_t *>(&settings);

    flash_safe_execute(flash_store_callback, settingsAsBytes, 1000);
}

Settings read_settings() {
    Settings settings;
    memcpy(&settings, flash_target_contents, sizeof(struct Settings));
    return settings;
}