1 /* Wear levelling and FAT filesystem example.
2 This example code is in the Public Domain (or CC0 licensed, at your option.)
3
4 Unless required by applicable law or agreed to in writing, this
5 software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
6 CONDITIONS OF ANY KIND, either express or implied.
7
8 This sample shows how to store files inside a FAT filesystem.
9 FAT filesystem is stored in a partition inside SPI flash, using the
10 flash wear levelling library.
11 */
12
13 #include <stdlib.h>
14 #include <stdio.h>
15 #include <string.h>
16 #include "esp_vfs.h"
17 #include "esp_vfs_fat.h"
18 #include "esp_system.h"
19
20 static const char *TAG = "example";
21
22 // Handle of the wear levelling library instance
23 static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;
24
25 // Mount path for the partition
26 const char *base_path = "/spiflash";
27
app_main(void)28 void app_main(void)
29 {
30 ESP_LOGI(TAG, "Mounting FAT filesystem");
31 // To mount device we need name of device partition, define base_path
32 // and allow format partition in case if it is new one and was not formated before
33 const esp_vfs_fat_mount_config_t mount_config = {
34 .max_files = 4,
35 .format_if_mount_failed = true,
36 .allocation_unit_size = CONFIG_WL_SECTOR_SIZE
37 };
38 esp_err_t err = esp_vfs_fat_spiflash_mount(base_path, "storage", &mount_config, &s_wl_handle);
39 if (err != ESP_OK) {
40 ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
41 return;
42 }
43 ESP_LOGI(TAG, "Opening file");
44 FILE *f = fopen("/spiflash/hello.txt", "wb");
45 if (f == NULL) {
46 ESP_LOGE(TAG, "Failed to open file for writing");
47 return;
48 }
49 fprintf(f, "written using ESP-IDF %s\n", esp_get_idf_version());
50 fclose(f);
51 ESP_LOGI(TAG, "File written");
52
53 // Open file for reading
54 ESP_LOGI(TAG, "Reading file");
55 f = fopen("/spiflash/hello.txt", "rb");
56 if (f == NULL) {
57 ESP_LOGE(TAG, "Failed to open file for reading");
58 return;
59 }
60 char line[128];
61 fgets(line, sizeof(line), f);
62 fclose(f);
63 // strip newline
64 char *pos = strchr(line, '\n');
65 if (pos) {
66 *pos = '\0';
67 }
68 ESP_LOGI(TAG, "Read from file: '%s'", line);
69
70 // Unmount FATFS
71 ESP_LOGI(TAG, "Unmounting FAT filesystem");
72 ESP_ERROR_CHECK( esp_vfs_fat_spiflash_unmount(base_path, s_wl_handle));
73
74 ESP_LOGI(TAG, "Done");
75 }
76
