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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "nvs.hpp"
#include <stdint.h>
#include <cstdint>
#include <memory>
#include "esp_log.h"
#include "nvs.h"
#include "nvs_flash.h"
namespace drivers {
static constexpr char kTag[] = "nvm";
static constexpr uint8_t kSchemaVersion = 1;
static constexpr char kKeyVersion[] = "ver";
auto NvsStorage::Open() -> NvsStorage* {
esp_err_t err = nvs_flash_init();
if (err == ESP_ERR_NVS_NO_FREE_PAGES) {
ESP_LOGW(kTag, "partition needs initialisation");
nvs_flash_erase();
err = nvs_flash_init();
}
if (err != ESP_OK) {
ESP_LOGE(kTag, "failed to init nvm");
return nullptr;
}
nvs_handle_t handle;
if ((err = nvs_open("tangara", NVS_READWRITE, &handle)) != ESP_OK) {
ESP_LOGE(kTag, "failed to open nvs namespace");
return nullptr;
}
std::unique_ptr<NvsStorage> instance = std::make_unique<NvsStorage>(handle);
if (instance->SchemaVersion() < kSchemaVersion) {
ESP_LOGW(kTag, "namespace needs downgrading");
nvs_erase_all(handle);
nvs_set_u8(handle, kKeyVersion, kSchemaVersion);
err = nvs_commit(handle);
if (err != ESP_OK) {
ESP_LOGW(kTag, "failed to init namespace");
return nullptr;
}
}
ESP_LOGI(kTag, "nvm storage initialised okay");
return instance.release();
}
NvsStorage::NvsStorage(nvs_handle_t handle) : handle_(handle) {}
NvsStorage::~NvsStorage() {
nvs_close(handle_);
nvs_flash_deinit();
}
auto NvsStorage::SchemaVersion() -> uint8_t {
uint8_t ret;
if (nvs_get_u8(handle_, kKeyVersion, &ret) != ESP_OK) {
return UINT8_MAX;
}
return ret;
}
} // namespace drivers
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