mirror of
https://github.com/espressif/esp-idf.git
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117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Brian Pugh
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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 <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "esp_littlefs.h"
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static const char *TAG = "esp_littlefs";
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void app_main(void)
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{
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ESP_LOGI(TAG, "Initializing LittleFS");
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esp_vfs_littlefs_conf_t conf = {
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.base_path = "/littlefs",
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.partition_label = "storage",
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.format_if_mount_failed = true,
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.dont_mount = false,
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};
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// Use settings defined above to initialize and mount LittleFS filesystem.
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// Note: esp_vfs_littlefs_register is an all-in-one convenience function.
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esp_err_t ret = esp_vfs_littlefs_register(&conf);
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if (ret != ESP_OK) {
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if (ret == ESP_FAIL) {
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ESP_LOGE(TAG, "Failed to mount or format filesystem");
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} else if (ret == ESP_ERR_NOT_FOUND) {
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ESP_LOGE(TAG, "Failed to find LittleFS partition");
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} else {
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ESP_LOGE(TAG, "Failed to initialize LittleFS (%s)", esp_err_to_name(ret));
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}
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return;
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}
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size_t total = 0, used = 0;
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ret = esp_littlefs_info(conf.partition_label, &total, &used);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to get LittleFS partition information (%s)", esp_err_to_name(ret));
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esp_littlefs_format(conf.partition_label);
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} else {
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ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
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}
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// Use POSIX and C standard library functions to work with files.
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// First create a file.
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ESP_LOGI(TAG, "Opening file");
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FILE *f = fopen("/littlefs/hello.txt", "w");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for writing");
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return;
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}
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fprintf(f, "Hello World!\n");
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fclose(f);
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ESP_LOGI(TAG, "File written");
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// Check if destination file exists before renaming
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struct stat st;
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if (stat("/littlefs/foo.txt", &st) == 0) {
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// Delete it if it exists
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unlink("/littlefs/foo.txt");
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}
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// Rename original file
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ESP_LOGI(TAG, "Renaming file");
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if (rename("/littlefs/hello.txt", "/littlefs/foo.txt") != 0) {
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ESP_LOGE(TAG, "Rename failed");
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return;
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}
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// Open renamed file for reading
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ESP_LOGI(TAG, "Reading file");
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f = fopen("/littlefs/foo.txt", "r");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for reading");
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return;
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}
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char line[128];
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fgets(line, sizeof(line), f);
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fclose(f);
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// strip newline
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char*pos = strchr(line, '\n');
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if (pos) {
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*pos = '\0';
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}
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ESP_LOGI(TAG, "Read from file: '%s'", line);
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ESP_LOGI(TAG, "Reading from flashed filesystem example.txt");
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f = fopen("/littlefs/example.txt", "r");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for reading");
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return;
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}
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fgets(line, sizeof(line), f);
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fclose(f);
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// strip newline
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pos = strchr(line, '\n');
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if (pos) {
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*pos = '\0';
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}
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ESP_LOGI(TAG, "Read from file: '%s'", line);
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// All done, unmount partition and disable LittleFS
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esp_vfs_littlefs_unregister(conf.partition_label);
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ESP_LOGI(TAG, "LittleFS unmounted");
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}
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