750818de72
* If esp_vfs_spiffs_register is called with an explicit partition label, other SPIFFS functions (info, format, unregister) must be called with the same label. * On the other hand, if label was NULL in the call to esp_vfs_spiffs_register and the first matching partition was used, calls to the rest of the SPIFFS functions should be done with NULL partition_label argument. Fix the Doxygen documentation. Update the example accordingly, in case a user modifies "partition_label" value in esp_vfs_spiffs_conf_t conf initializer. Closes https://github.com/espressif/esp-idf/issues/4450
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* SPIFFS filesystem example.
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/unistd.h>
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#include <sys/stat.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "esp_spiffs.h"
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static const char *TAG = "example";
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void app_main(void)
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{
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ESP_LOGI(TAG, "Initializing SPIFFS");
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esp_vfs_spiffs_conf_t conf = {
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.base_path = "/spiffs",
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.partition_label = NULL,
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.max_files = 5,
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.format_if_mount_failed = true
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};
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// Use settings defined above to initialize and mount SPIFFS filesystem.
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// Note: esp_vfs_spiffs_register is an all-in-one convenience function.
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esp_err_t ret = esp_vfs_spiffs_register(&conf);
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if (ret != ESP_OK) {
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if (ret == ESP_FAIL) {
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ESP_LOGE(TAG, "Failed to mount or format filesystem");
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} else if (ret == ESP_ERR_NOT_FOUND) {
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ESP_LOGE(TAG, "Failed to find SPIFFS partition");
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} else {
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ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret));
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}
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return;
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}
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size_t total = 0, used = 0;
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ret = esp_spiffs_info(conf.partition_label, &total, &used);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret));
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} else {
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ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
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}
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// Use POSIX and C standard library functions to work with files.
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// First create a file.
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ESP_LOGI(TAG, "Opening file");
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FILE* f = fopen("/spiffs/hello.txt", "w");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for writing");
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return;
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}
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fprintf(f, "Hello World!\n");
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fclose(f);
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ESP_LOGI(TAG, "File written");
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// Check if destination file exists before renaming
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struct stat st;
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if (stat("/spiffs/foo.txt", &st) == 0) {
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// Delete it if it exists
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unlink("/spiffs/foo.txt");
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}
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// Rename original file
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ESP_LOGI(TAG, "Renaming file");
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if (rename("/spiffs/hello.txt", "/spiffs/foo.txt") != 0) {
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ESP_LOGE(TAG, "Rename failed");
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return;
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}
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// Open renamed file for reading
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ESP_LOGI(TAG, "Reading file");
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f = fopen("/spiffs/foo.txt", "r");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for reading");
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return;
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}
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char line[64];
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fgets(line, sizeof(line), f);
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fclose(f);
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// strip newline
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char* pos = strchr(line, '\n');
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if (pos) {
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*pos = '\0';
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}
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ESP_LOGI(TAG, "Read from file: '%s'", line);
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// All done, unmount partition and disable SPIFFS
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esp_vfs_spiffs_unregister(conf.partition_label);
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ESP_LOGI(TAG, "SPIFFS unmounted");
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}
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