This change adds a check for compatibility between the nvs version found on nvs flash and the one assumed by running code during nvs initialization. Any mismatch is reported to the user using new error code ESP_ERR_NVS_NEW_VERSION_FOUND.
85 lines
2.8 KiB
C
85 lines
2.8 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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// Initialize NVS
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esp_err_t err = nvs_flash_init();
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if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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// NVS partition was truncated and needs to be erased
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// Retry nvs_flash_init
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ESP_ERROR_CHECK(nvs_flash_erase());
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err = nvs_flash_init();
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}
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ESP_ERROR_CHECK( err );
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// Open
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printf("\n");
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printf("Opening Non-Volatile Storage (NVS) handle... ");
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nvs_handle my_handle;
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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 (%s) opening NVS handle!\n", esp_err_to_name(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_counter", &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 (%s) reading!\n", esp_err_to_name(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_counter", 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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