1 /* SPIFFS 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
9 #include <stdio.h>
10 #include <string.h>
11 #include <sys/unistd.h>
12 #include <sys/stat.h>
13 #include "esp_err.h"
14 #include "esp_log.h"
15 #include "esp_spiffs.h"
16
17 static const char *TAG = "example";
18
app_main(void)19 void app_main(void)
20 {
21 ESP_LOGI(TAG, "Initializing SPIFFS");
22
23 esp_vfs_spiffs_conf_t conf = {
24 .base_path = "/spiffs",
25 .partition_label = NULL,
26 .max_files = 5,
27 .format_if_mount_failed = true
28 };
29
30 // Use settings defined above to initialize and mount SPIFFS filesystem.
31 // Note: esp_vfs_spiffs_register is an all-in-one convenience function.
32 esp_err_t ret = esp_vfs_spiffs_register(&conf);
33
34 if (ret != ESP_OK) {
35 if (ret == ESP_FAIL) {
36 ESP_LOGE(TAG, "Failed to mount or format filesystem");
37 } else if (ret == ESP_ERR_NOT_FOUND) {
38 ESP_LOGE(TAG, "Failed to find SPIFFS partition");
39 } else {
40 ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret));
41 }
42 return;
43 }
44
45 size_t total = 0, used = 0;
46 ret = esp_spiffs_info(conf.partition_label, &total, &used);
47 if (ret != ESP_OK) {
48 ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret));
49 } else {
50 ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
51 }
52
53 // Use POSIX and C standard library functions to work with files.
54 // First create a file.
55 ESP_LOGI(TAG, "Opening file");
56 FILE* f = fopen("/spiffs/hello.txt", "w");
57 if (f == NULL) {
58 ESP_LOGE(TAG, "Failed to open file for writing");
59 return;
60 }
61 fprintf(f, "Hello World!\n");
62 fclose(f);
63 ESP_LOGI(TAG, "File written");
64
65 // Check if destination file exists before renaming
66 struct stat st;
67 if (stat("/spiffs/foo.txt", &st) == 0) {
68 // Delete it if it exists
69 unlink("/spiffs/foo.txt");
70 }
71
72 // Rename original file
73 ESP_LOGI(TAG, "Renaming file");
74 if (rename("/spiffs/hello.txt", "/spiffs/foo.txt") != 0) {
75 ESP_LOGE(TAG, "Rename failed");
76 return;
77 }
78
79 // Open renamed file for reading
80 ESP_LOGI(TAG, "Reading file");
81 f = fopen("/spiffs/foo.txt", "r");
82 if (f == NULL) {
83 ESP_LOGE(TAG, "Failed to open file for reading");
84 return;
85 }
86 char line[64];
87 fgets(line, sizeof(line), f);
88 fclose(f);
89 // strip newline
90 char* pos = strchr(line, '\n');
91 if (pos) {
92 *pos = '\0';
93 }
94 ESP_LOGI(TAG, "Read from file: '%s'", line);
95
96 // All done, unmount partition and disable SPIFFS
97 esp_vfs_spiffs_unregister(conf.partition_label);
98 ESP_LOGI(TAG, "SPIFFS unmounted");
99 }
100
