1 /*

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

 3 */

 4

 5 #include <stdlib.h>

 6 #include <stdio.h>

 7 #include <string.h>

 8 #include "esp_vfs.h"

 9 #include "esp_vfs_fat.h"

10 #include "esp_system.h"

11

12 static const char *TAG = "example";

13

14 // 磨损均衡处理实例

15 static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;

16

17 // 分区挂在路径

18 const char *base_path = "/spiflash";

19

20 void app_main(void)

21 {

22     ESP_LOGI(TAG, "Mounting FAT filesystem");

23

24     // 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

25     const esp_vfs_fat_mount_config_t mount_config = {

26             .max_files = 4,

27             .format_if_mount_failed = true,

28             .allocation_unit_size = CONFIG_WL_SECTOR_SIZE

29     };

30     esp_err_t err = esp_vfs_fat_spiflash_mount(base_path, "storage", &mount_config, &s_wl_handle);

31     if (err != ESP_OK) {

32         ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));

33         return;

34     }

35     ESP_LOGI(TAG, "Opening file");

36     FILE *f = fopen("/spiflash/hello.txt", "wb"); // 读写或建立一个二进制文件

37     if (f == NULL) {

38         ESP_LOGE(TAG, "Failed to open file for writing");

39         return;

40     }

41     fprintf(f, "written using ESP-IDF %s\n", esp_get_idf_version());

42     fclose(f);

43     ESP_LOGI(TAG, "File written");

44

45     // 打开

46     ESP_LOGI(TAG, "Reading file");

47     f = fopen("/spiflash/hello.txt", "rb"); // 读写打开一个二进制文件

48     if (f == NULL) {

49         ESP_LOGE(TAG, "Failed to open file for reading");

50         return;

51     }

52     char line[128];

53     // 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

54     fgets(line, sizeof(line), f);

55     fclose(f);

56     // 查找换行符

57     char *pos = strchr(line, '\n');

58     if (pos) {

59         *pos = '\0'; //放置一个空字符串

60     }

61     ESP_LOGI(TAG, "Read from file: '%s'", line);

62

63     // 卸载FAT文件系统

64     ESP_LOGI(TAG, "Unmounting FAT filesystem");

65     ESP_ERROR_CHECK( esp_vfs_fat_spiflash_unmount(base_path, s_wl_handle));

66

67     ESP_LOGI(TAG, "Done");

68 }