ESP32-FAT文件系统使用磨损均衡存储文件笔记

基于ESP-IDF4.1

/* 
   FAT文件系统存储文件，使用磨损均衡库wear-leveling
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "esp_vfs.h"
#include "esp_vfs_fat.h"
#include "esp_system.h"

static const char *TAG = "example";

// 磨损均衡处理实例
static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;

// 分区挂在路径
const char *base_path = "/spiflash";

void app_main(void)
{
    ESP_LOGI(TAG, "Mounting FAT filesystem");

    // 命名设备分区，定义base_path。如果是新分区并且没有格式化过则允许格式化分区
    const esp_vfs_fat_mount_config_t mount_config = {
            .max_files = 4,
            .format_if_mount_failed = true,
            .allocation_unit_size = CONFIG_WL_SECTOR_SIZE
    };
    esp_err_t err = esp_vfs_fat_spiflash_mount(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, "Opening file");
    FILE *f = fopen("/spiflash/hello.txt", "wb"); // 读写或建立一个二进制文件
    if (f == NULL) {
        ESP_LOGE(TAG, "Failed to open file for writing");
        return;
    }
    fprintf(f, "written using ESP-IDF %s
", esp_get_idf_version());
    fclose(f);
    ESP_LOGI(TAG, "File written");

    // 打开
    ESP_LOGI(TAG, "Reading file");
    f = fopen("/spiflash/hello.txt", "rb"); // 读写打开一个二进制文件
    if (f == NULL) {
        ESP_LOGE(TAG, "Failed to open file for reading");
        return;
    }
    char line[128];
    // 从指定的流 f 读取一行，并把它存储在 line 所指向的字符串内
    fgets(line, sizeof(line), f);
    fclose(f);
    // 查找换行符
    char *pos = strchr(line, '
');
    if (pos) {
        *pos = ''; //放置一个空字符串
    }
    ESP_LOGI(TAG, "Read from file: '%s'", line);

    // 卸载FAT文件系统
    ESP_LOGI(TAG, "Unmounting FAT filesystem");
    ESP_ERROR_CHECK( esp_vfs_fat_spiflash_unmount(base_path, s_wl_handle));

    ESP_LOGI(TAG, "Done");
}

原文：https://gitee.com/EspressifSystems/esp-idf