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