基于ESP-IDF4.1

1 #include
2 #include "freertos/FreeRTOS.h"
3 #include "freertos/task.h"
4 #include "esp_system.h"
5 #include "nvs_flash.h"
6 #include "nvs.h"
7
8 void app_main(void)
9 {
10 // 初始化非易失性存储
11 esp_err_t err = nvs_flash_init();
12 if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
13 // NVS分区被截断，需要擦除并重新初始化
14 ESP_ERROR_CHECK(nvs_flash_erase());
15 err = nvs_flash_init();
16 }
17 ESP_ERROR_CHECK( err );
18
19 // 打开
20 printf("\n");
21 printf("Opening Non-Volatile Storage (NVS) handle… ");
22 nvs_handle_t my_handle;
23 err = nvs_open("storage", NVS_READWRITE, &my_handle);
24 if (err != ESP_OK) {
25 printf("Error (%s) opening NVS handle!\n", esp_err_to_name(err));
26 } else {
27 printf("Done\n");
28
29 // 读取
30 printf("Reading restart counter from NVS … ");
31 int32_t restart_counter = 0; // NVC中没有设置值得话，需要设置默认值为0
32 err = nvs_get_i32(my_handle, "restart_counter", &restart_counter);
33 switch (err) {
34 case ESP_OK:
35 printf("Done\n");
36 printf("Restart counter = %d\n", restart_counter);
37 break;
38 case ESP_ERR_NVS_NOT_FOUND:
39 printf("The value is not initialized yet!\n");
40 break;
41 default :
42 printf("Error (%s) reading!\n", esp_err_to_name(err));
43 }
44
45 // 写入
46 printf("Updating restart counter in NVS … ");
47 restart_counter++;
48 err = nvs_set_i32(my_handle, "restart_counter", restart_counter);
49 printf((err != ESP_OK) ? "Failed!\n" : "Done\n");
50
51 //提交写入的值，其它时间提交写入没有保证
52 printf("Committing updates in NVS … ");
53 err = nvs_commit(my_handle);
54 printf((err != ESP_OK) ? "Failed!\n" : "Done\n");
55
56 // 关闭
57 nvs_close(my_handle);
58 }
59
60 printf("\n");
61
62 // 设备重启
63 for (int i = 10; i >= 0; i--) {
64 printf("Restarting in %d seconds…\n", i);
65 vTaskDelay(1000 / portTICK_PERIOD_MS);
66 }
67 printf("Restarting now.\n");
68 fflush(stdout);
69 esp_restart();
70 }

原文：https://gitee.com/EspressifSystems/esp-idf