esp-idf/examples/storage/fatfsgen/main/fatfsgen_example_main.c
2022-07-26 14:50:07 +02:00

154 lines
4.2 KiB
C

/*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "esp_vfs.h"
#include "esp_vfs_fat.h"
#include "esp_system.h"
#include "sdkconfig.h"
#if CONFIG_EXAMPLE_FATFS_MODE_READ_ONLY
#define EXAMPLE_FATFS_MODE_READ_ONLY true
#else
#define EXAMPLE_FATFS_MODE_READ_ONLY false
#endif
#if CONFIG_FATFS_LFN_NONE
#define EXAMPLE_FATFS_LONG_NAMES false
#else
#define EXAMPLE_FATFS_LONG_NAMES true
#endif
static const char *TAG = "example";
// Mount path for the partition
const char *base_path = "/spiflash";
// Handle of the wear levelling library instance
static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;
void app_main(void)
{
ESP_LOGI(TAG, "Mounting FAT filesystem");
// To mount device we need name of device partition, define base_path
// and allow format partition in case if it is new one and was not formatted before
const esp_vfs_fat_mount_config_t mount_config = {
.max_files = 4,
.format_if_mount_failed = false,
.allocation_unit_size = CONFIG_WL_SECTOR_SIZE
};
esp_err_t err;
if (EXAMPLE_FATFS_MODE_READ_ONLY){
err = esp_vfs_fat_spiflash_mount_ro(base_path, "storage", &mount_config);
} else {
err = esp_vfs_fat_spiflash_mount_rw_wl(base_path, "storage", &mount_config, &s_wl_handle);
}
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
return;
}
char line[128];
char *device_filename;
if (EXAMPLE_FATFS_LONG_NAMES){
device_filename = "/spiflash/innerbutverylongname.txt";
} else {
device_filename = "/spiflash/inner.txt";
}
if (!EXAMPLE_FATFS_MODE_READ_ONLY){
// Open file for reading
ESP_LOGI(TAG, "Opening file");
FILE *f;
for(int i = 0; i < CONFIG_EXAMPLE_FATFS_WRITE_COUNT; i++){
f = fopen(device_filename, "wb");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for writing");
return;
}
fprintf(f, "This is written by the device");
fclose(f);
}
ESP_LOGI(TAG, "File written");
// Open file for reading
ESP_LOGI(TAG, "Reading file");
f = fopen(device_filename, "rb");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for reading");
return;
}
fgets(line, sizeof(line), f);
fclose(f);
// strip newline
char *pos = strchr(line, '\n');
if (pos) {
*pos = '\0';
}
ESP_LOGI(TAG, "Read from file: '%s'", line);
}
FILE *f;
char *pos;
ESP_LOGI(TAG, "Reading file");
char *host_filename1;
char *host_filename2;
if (EXAMPLE_FATFS_LONG_NAMES){
host_filename1 = "/spiflash/sublongnames/testlongfilenames.txt";
host_filename2 = "/spiflash/hellolongname.txt";
} else{
host_filename1 = "/spiflash/sub/test.txt";
host_filename2 = "/spiflash/hello.txt";
}
struct stat info;
struct tm timeinfo;
char buffer[32];
if(stat(host_filename1, &info) < 0){
ESP_LOGE(TAG, "Failed to read file stats");
return;
}
localtime_r(&info.st_mtime, &timeinfo);
strftime(buffer, sizeof(buffer), "%Y-%m-%d", &timeinfo);
ESP_LOGI(TAG, "The file '%s' was modified at date: %s", host_filename1, buffer);
if (EXAMPLE_FATFS_MODE_READ_ONLY){
f = fopen(host_filename1, "rb");
} else {
f = fopen(host_filename2, "rb");
}
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for reading");
return;
}
fgets(line, sizeof(line), f);
fclose(f);
// strip newline
pos = strchr(line, '\n');
if (pos) {
*pos = '\0';
}
ESP_LOGI(TAG, "Read from file: '%s'", line);
// Unmount FATFS
ESP_LOGI(TAG, "Unmounting FAT filesystem");
if (EXAMPLE_FATFS_MODE_READ_ONLY){
ESP_ERROR_CHECK(esp_vfs_fat_spiflash_unmount_ro(base_path, "storage"));
} else {
ESP_ERROR_CHECK(esp_vfs_fat_spiflash_unmount_rw_wl(base_path, s_wl_handle));
}
ESP_LOGI(TAG, "Done");
}