mirror of
https://github.com/espressif/esp-idf.git
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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* Non-Volatile Storage (NVS) Read and Write a Value - Example
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For other examples please check:
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https://github.com/espressif/esp-idf/tree/master/examples
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_system.h"
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#include "nvs_flash.h"
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#include "nvs.h"
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void app_main()
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{
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nvs_flash_init();
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nvs_handle my_handle;
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esp_err_t err;
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printf("\n");
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// Open
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printf("Opening Non-Volatile Storage (NVS) ... ");
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err = nvs_open("storage", NVS_READWRITE, &my_handle);
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if (err != ESP_OK) {
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printf("Error (%d) opening NVS!\n", err);
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} else {
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printf("Done\n");
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// Read
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printf("Reading restart counter from NVS ... ");
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int32_t restart_counter = 0; // value will default to 0, if not set yet in NVS
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err = nvs_get_i32(my_handle, "restart_conter", &restart_counter);
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switch (err) {
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case ESP_OK:
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printf("Done\n");
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printf("Restart counter = %d\n", restart_counter);
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break;
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case ESP_ERR_NVS_NOT_FOUND:
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printf("The value is not initialized yet!\n");
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break;
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default :
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printf("Error (%d) reading!\n", err);
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}
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// Write
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printf("Updating restart counter in NVS ... ");
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restart_counter++;
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err = nvs_set_i32(my_handle, "restart_conter", restart_counter);
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printf((err != ESP_OK) ? "Failed!\n" : "Done\n");
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// Commit written value.
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// After setting any values, nvs_commit() must be called to ensure changes are written
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// to flash storage. Implementations may write to storage at other times,
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// but this is not guaranteed.
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printf("Committing updates in NVS ... ");
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err = nvs_commit(my_handle);
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printf((err != ESP_OK) ? "Failed!\n" : "Done\n");
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// Close
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nvs_close(my_handle);
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}
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printf("\n");
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// Restart module
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for (int i = 10; i >= 0; i--) {
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printf("Restarting in %d seconds...\n", i);
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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printf("Restarting now.\n");
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fflush(stdout);
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esp_restart();
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}
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