mirror of
https://github.com/espressif/esp-idf.git
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90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
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/* Non-Volatile Storage (NVS) Image Generation on Build Example
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*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#include <stdio.h>
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#include <inttypes.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 "esp_log.h"
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#include "nvs_flash.h"
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#include "nvs.h"
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static const char *TAG = "example";
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void app_main(void)
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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 the pre-filled NVS partition called "nvs"
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ESP_LOGI(TAG, "Opening Non-Volatile Storage (NVS) handle");
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nvs_handle_t my_handle;
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err = nvs_open_from_partition("nvs", "storage", NVS_READONLY, &my_handle);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Error (%s) opening NVS handle!\n", esp_err_to_name(err));
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return;
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}
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ESP_LOGI(TAG, "The NVS handle successfully opened");
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// Read values
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ESP_LOGI(TAG, "Reading values from NVS");
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uint8_t u8_val = 0;
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err = nvs_get_u8(my_handle, "u8_key", &u8_val);
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ESP_ERROR_CHECK(err);
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printf("%"PRIu8"\n", u8_val);
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assert(u8_val == 255);
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int8_t i8_val = 0;
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err = nvs_get_i8(my_handle, "i8_key", &i8_val);
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ESP_ERROR_CHECK(err);
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printf("%"PRIi8"\n", i8_val);
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assert(i8_val == -128);
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uint16_t u16_val = 0;
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err = nvs_get_u16(my_handle, "u16_key", &u16_val);
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ESP_ERROR_CHECK(err);
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printf("%"PRIu16"\n", u16_val);
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assert(u16_val == 65535);
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uint32_t u32_val = 0;
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err = nvs_get_u32(my_handle, "u32_key", &u32_val);
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ESP_ERROR_CHECK(err);
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printf("%"PRIu32"\n", u32_val);
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assert(u32_val == 4294967295);
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int32_t i32_val = 0;
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err = nvs_get_i32(my_handle, "i32_key", &i32_val);
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ESP_ERROR_CHECK(err);
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printf("%"PRIi32"\n", i32_val);
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assert(i32_val == -2147483648);
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size_t str_len = 0;
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err = nvs_get_str(my_handle, "str_key", NULL, &str_len);
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ESP_ERROR_CHECK(err);
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assert(str_len == 222);
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char* str_val = (char*) malloc(str_len);
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err = nvs_get_str(my_handle, "str_key", str_val, &str_len);
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ESP_ERROR_CHECK(err);
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printf("%s\n", str_val);
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assert(str_val[0] == 'L');
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free(str_val);
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// Close
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nvs_close(my_handle);
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ESP_LOGI(TAG, "Reading values from NVS done - all OK");
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}
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