esp-idf/components/fatfs/vfs/esp_vfs_fat.h

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <stddef.h>
#include "esp_err.h"
#include "driver/gpio.h"
#include "driver/sdmmc_types.h"
#include "driver/sdmmc_host.h"
#include "driver/sdspi_host.h"
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#include "ff.h"
#include "wear_levelling.h"
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#ifdef __cplusplus
extern "C" {
#endif
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/**
* @brief Register FATFS with VFS component
*
* This function registers given FAT drive in VFS, at the specified base path.
* If only one drive is used, fat_drive argument can be an empty string.
* Refer to FATFS library documentation on how to specify FAT drive.
* This function also allocates FATFS structure which should be used for f_mount
* call.
*
* @note This function doesn't mount the drive into FATFS, it just connects
* POSIX and C standard library IO function with FATFS. You need to mount
* desired drive into FATFS separately.
*
* @param base_path path prefix where FATFS should be registered
* @param fat_drive FATFS drive specification; if only one drive is used, can be an empty string
* @param max_files maximum number of files which can be open at the same time
* @param[out] out_fs pointer to FATFS structure which can be used for FATFS f_mount call is returned via this argument.
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_register was already called
* - ESP_ERR_NO_MEM if not enough memory or too many VFSes already registered
*/
esp_err_t esp_vfs_fat_register(const char* base_path, const char* fat_drive,
size_t max_files, FATFS** out_fs);
/**
* @brief Un-register FATFS from VFS
*
* @note FATFS structure returned by esp_vfs_fat_register is destroyed after
* this call. Make sure to call f_mount function to unmount it before
* calling esp_vfs_fat_unregister.
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* This function is left for compatibility and will be changed in
* future versions to accept base_path and replace the method below
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* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if FATFS is not registered in VFS
*/
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esp_err_t esp_vfs_fat_unregister() __attribute__((deprecated));
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/**
* @brief Un-register FATFS from VFS
*
* @note FATFS structure returned by esp_vfs_fat_register is destroyed after
* this call. Make sure to call f_mount function to unmount it before
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* calling esp_vfs_fat_unregister_ctx.
* Difference between this function and the one above is that this one
* will release the correct drive, while the one above will release
* the last registered one
*
* @param base_path path prefix where FATFS is registered. This is the same
* used when esp_vfs_fat_register was called
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if FATFS is not registered in VFS
*/
esp_err_t esp_vfs_fat_unregister_path(const char* base_path);
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/**
* @brief Configuration arguments for esp_vfs_fat_sdmmc_mount and esp_vfs_fat_spiflash_mount functions
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*/
typedef struct {
/**
* If FAT partition can not be mounted, and this parameter is true,
* create partition table and format the filesystem.
*/
bool format_if_mount_failed;
int max_files; ///< Max number of open files
/**
* If format_if_mount_failed is set, and mount fails, format the card
* with given allocation unit size. Must be a power of 2, between sector
* size and 128 * sector size.
* For SD cards, sector size is always 512 bytes. For wear_levelling,
* sector size is determined by CONFIG_WL_SECTOR_SIZE option.
*
* Using larger allocation unit size will result in higher read/write
* performance and higher overhead when storing small files.
*
* Setting this field to 0 will result in allocation unit set to the
* sector size.
*/
size_t allocation_unit_size;
} esp_vfs_fat_mount_config_t;
// Compatibility definition
typedef esp_vfs_fat_mount_config_t esp_vfs_fat_sdmmc_mount_config_t;
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/**
* @brief Convenience function to get FAT filesystem on SD card registered in VFS
*
* This is an all-in-one function which does the following:
* - initializes SDMMC driver or SPI driver with configuration in host_config
* - initializes SD card with configuration in slot_config
* - mounts FAT partition on SD card using FATFS library, with configuration in mount_config
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* - registers FATFS library with VFS, with prefix given by base_prefix variable
*
* This function is intended to make example code more compact.
* For real world applications, developers should implement the logic of
* probing SD card, locating and mounting partition, and registering FATFS in VFS,
* with proper error checking and handling of exceptional conditions.
*
* @param base_path path where partition should be registered (e.g. "/sdcard")
* @param host_config Pointer to structure describing SDMMC host. When using
* SDMMC peripheral, this structure can be initialized using
* SDMMC_HOST_DEFAULT() macro. When using SPI peripheral,
* this structure can be initialized using SDSPI_HOST_DEFAULT()
* macro.
* @param slot_config Pointer to structure with slot configuration.
* For SDMMC peripheral, pass a pointer to sdmmc_slot_config_t
* structure initialized using SDMMC_SLOT_CONFIG_DEFAULT.
* For SPI peripheral, pass a pointer to sdspi_slot_config_t
* structure initialized using SDSPI_SLOT_CONFIG_DEFAULT.
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* @param mount_config pointer to structure with extra parameters for mounting FATFS
* @param[out] out_card if not NULL, pointer to the card information structure will be returned via this argument
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_sdmmc_mount was already called
* - ESP_ERR_NO_MEM if memory can not be allocated
* - ESP_FAIL if partition can not be mounted
* - other error codes from SDMMC or SPI drivers, SDMMC protocol, or FATFS drivers
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*/
esp_err_t esp_vfs_fat_sdmmc_mount(const char* base_path,
const sdmmc_host_t* host_config,
const void* slot_config,
const esp_vfs_fat_mount_config_t* mount_config,
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sdmmc_card_t** out_card);
/**
* @brief Unmount FAT filesystem and release resources acquired using esp_vfs_fat_sdmmc_mount
*
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_sdmmc_mount hasn't been called
*/
esp_err_t esp_vfs_fat_sdmmc_unmount();
/**
* @brief Convenience function to initialize FAT filesystem in SPI flash and register it in VFS
*
* This is an all-in-one function which does the following:
*
* - finds the partition with defined partition_label. Partition label should be
* configured in the partition table.
* - initializes flash wear levelling library on top of the given partition
* - mounts FAT partition using FATFS library on top of flash wear levelling
* library
* - registers FATFS library with VFS, with prefix given by base_prefix variable
*
* This function is intended to make example code more compact.
*
* @param base_path path where FATFS partition should be mounted (e.g. "/spiflash")
* @param partition_label label of the partition which should be used
* @param mount_config pointer to structure with extra parameters for mounting FATFS
* @param[out] wl_handle wear levelling driver handle
* @return
* - ESP_OK on success
* - ESP_ERR_NOT_FOUND if the partition table does not contain FATFS partition with given label
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_spiflash_mount was already called
* - ESP_ERR_NO_MEM if memory can not be allocated
* - ESP_FAIL if partition can not be mounted
* - other error codes from wear levelling library, SPI flash driver, or FATFS drivers
*/
esp_err_t esp_vfs_fat_spiflash_mount(const char* base_path,
const char* partition_label,
const esp_vfs_fat_mount_config_t* mount_config,
wl_handle_t* wl_handle);
/**
* @brief Unmount FAT filesystem and release resources acquired using esp_vfs_fat_spiflash_mount
*
* @param base_path path where partition should be registered (e.g. "/spiflash")
* @param wl_handle wear levelling driver handle returned by esp_vfs_fat_spiflash_mount
*
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_spiflash_mount hasn't been called
*/
esp_err_t esp_vfs_fat_spiflash_unmount(const char* base_path, wl_handle_t wl_handle);
/**
* @brief Convenience function to initialize read-only FAT filesystem and register it in VFS
*
* This is an all-in-one function which does the following:
*
* - finds the partition with defined partition_label. Partition label should be
* configured in the partition table.
* - mounts FAT partition using FATFS library
* - registers FATFS library with VFS, with prefix given by base_prefix variable
*
* @note Wear levelling is not used when FAT is mounted in read-only mode using this function.
*
* @param base_path path where FATFS partition should be mounted (e.g. "/spiflash")
* @param partition_label label of the partition which should be used
* @param mount_config pointer to structure with extra parameters for mounting FATFS
* @return
* - ESP_OK on success
* - ESP_ERR_NOT_FOUND if the partition table does not contain FATFS partition with given label
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_rawflash_mount was already called for the same partition
* - ESP_ERR_NO_MEM if memory can not be allocated
* - ESP_FAIL if partition can not be mounted
* - other error codes from SPI flash driver, or FATFS drivers
*/
esp_err_t esp_vfs_fat_rawflash_mount(const char* base_path,
const char* partition_label,
const esp_vfs_fat_mount_config_t* mount_config);
/**
* @brief Unmount FAT filesystem and release resources acquired using esp_vfs_fat_rawflash_mount
*
* @param base_path path where partition should be registered (e.g. "/spiflash")
* @param partition_label label of partition to be unmounted
*
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if esp_vfs_fat_spiflash_mount hasn't been called
*/
esp_err_t esp_vfs_fat_rawflash_unmount(const char* base_path, const char* partition_label);
#ifdef __cplusplus
}
#endif