NVS

/*
 * SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: CC0-1.0
 */

#include <stdio.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_chip_info.h"
#include "esp_flash.h"
#include "nvs_flash.h"
#include "esp_log.h"

/** 线程栈有限，咱不给他写在线程里,可以用申请变量方式，为了方便全局变量 */
char getstr[500] = {0};

void app_main(void)
{
    esp_err_t ret;
    ret = nvs_flash_init();
    /** ESP_ERR_NVS_NO_FREE_PAGES保证flash写入页是空的,以及nvs是否是新版本  */
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
    {
        ESP_ERROR_CHECK(nvs_flash_erase()); // 擦nvs
        ret = nvs_flash_init();             // 擦完再初始化
    }
    ESP_ERROR_CHECK(ret);
    /** 写  */
    nvs_handle_t nvs_handle;
    nvs_open("list", NVS_READWRITE, &nvs_handle);
    nvs_set_i8(nvs_handle, "test", 32);
    if (nvs_commit(nvs_handle) != ESP_OK) // nvs提交
    {
        ESP_LOGI("NVS","写入失败");
    }
    /** 读  */
    int8_t o_val;
    nvs_get_i8(nvs_handle,"test",&o_val);
    ESP_LOGI("NVS","%d",o_val);
    /** 写一串  */
    char test_str[] = "鸡你太美";
    nvs_set_str(nvs_handle,"test_str",test_str);
    if (nvs_commit(nvs_handle) != ESP_OK) // nvs提交
    {
        ESP_LOGI("NVS","写入失败");
    }
    /** 读一串  */
    uint8_t len = 500;//这个500要和上面的500相同
    nvs_get_str(nvs_handle,"test_str",getstr,&len);
    ESP_LOGI("NVS","%u %s",len,getstr);
    /** 另外还可以存链表，结构体等等，我想，类似于线程传参  */
    /** nvs_get_blob(nvs_handle_t c_handle, const char* key, void* out_value, size_t* length)  */
}