76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* Wear levelling and FAT 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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This sample shows how to store files inside a FAT filesystem.
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FAT filesystem is stored in a partition inside SPI flash, using the
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flash wear levelling library.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "esp_vfs.h"
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#include "esp_vfs_fat.h"
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#include "esp_system.h"
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static const char *TAG = "example";
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// Handle of the wear levelling library instance
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static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;
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// Mount path for the partition
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const char *base_path = "/spiflash";
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void app_main(void)
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{
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ESP_LOGI(TAG, "Mounting FAT filesystem");
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// To mount device we need name of device partition, define base_path
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// and allow format partition in case if it is new one and was not formated before
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const esp_vfs_fat_mount_config_t mount_config = {
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.max_files = 4,
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.format_if_mount_failed = true,
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.allocation_unit_size = CONFIG_WL_SECTOR_SIZE
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};
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esp_err_t err = esp_vfs_fat_spiflash_mount(base_path, "storage", &mount_config, &s_wl_handle);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
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return;
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}
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ESP_LOGI(TAG, "Opening file");
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FILE *f = fopen("/spiflash/hello.txt", "wb");
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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, "written using ESP-IDF %s\n", esp_get_idf_version());
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fclose(f);
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ESP_LOGI(TAG, "File written");
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// Open file for reading
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ESP_LOGI(TAG, "Reading file");
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f = fopen("/spiflash/hello.txt", "rb");
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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[128];
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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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// Unmount FATFS
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ESP_LOGI(TAG, "Unmounting FAT filesystem");
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ESP_ERROR_CHECK( esp_vfs_fat_spiflash_unmount(base_path, s_wl_handle));
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ESP_LOGI(TAG, "Done");
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}
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