getting_started sample
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Outline
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "esp_vfs.h"
#include "esp_vfs_fat.h"
#include "sdkconfig.h"
TAG
base_path
s_wl_handle
app_main()
Files
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SourceVuESP-IDF Framework and Examplesgetting_started samplemain/fatfs_getting_started_main.c
 
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/* * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Unlicense OR CC0-1.0 *//* ... */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include "esp_vfs.h" #include "esp_vfs_fat.h" #include "sdkconfig.h"6 includes static const char *TAG = "example"; // Mount path for the partition const char *base_path = "/spiflash"; // Handle of the wear levelling library instance static wl_handle_t s_wl_handle = WL_INVALID_HANDLE; void app_main(void) { ESP_LOGI(TAG, "Mounting FAT filesystem"); // To mount device we need name of device partition, define base_path // and allow format partition in case if it is new one and was not formatted before const esp_vfs_fat_mount_config_t mount_config = { .max_files = 4, // Number of files that can be open at a time .format_if_mount_failed = true, // If true, try to format the partition if mount fails .allocation_unit_size = CONFIG_WL_SECTOR_SIZE, // Size of allocation unit, cluster size. .use_one_fat = false, // Use only one FAT table (reduce memory usage), but decrease reliability of file system in case of power failure. }{...}; // Mount FATFS filesystem located on "storage" partition in read-write mode esp_err_t err = esp_vfs_fat_spiflash_mount_rw_wl(base_path, "storage", &mount_config, &s_wl_handle); if (err != ESP_OK) { ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err)); return; }{...} ESP_LOGI(TAG, "Filesystem mounted"); ESP_LOGI(TAG, "Opening file"); const char *filename = "/spiflash/example.txt"; FILE *f = fopen(filename, "wb"); if (f == NULL) { perror("fopen"); // Print reason why fopen failed ESP_LOGE(TAG, "Failed to open file for writing"); return; }{...} fprintf(f, "Hello World!\n"); fclose(f); ESP_LOGI(TAG, "File written"); // Open file for reading ESP_LOGI(TAG, "Reading file"); f = fopen(filename, "r"); if (f == NULL) { ESP_LOGE(TAG, "Failed to open file for reading"); return; }{...} char line[128]; fgets(line, sizeof(line), f); fclose(f); // strip newline char *pos = strchr(line, '\n'); if (pos) { *pos = '\0'; }{...} ESP_LOGI(TAG, "Read from file: '%s'", line); // Unmount FATFS ESP_LOGI(TAG, "Unmounting FAT filesystem"); ESP_ERROR_CHECK(esp_vfs_fat_spiflash_unmount_rw_wl(base_path, s_wl_handle)); ESP_LOGI(TAG, "Done"); }{ ... }
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