esp-idf/components/fatfs/vfs/vfs_fat_sdmmc.c

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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.
#include <stdlib.h>
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#include <string.h>
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#include "esp_log.h"
#include "esp_vfs.h"
#include "esp_vfs_fat.h"
#include "vfs_fat_internal.h"
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#include "driver/sdmmc_host.h"
#include "driver/sdspi_host.h"
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#include "sdmmc_cmd.h"
#include "diskio_impl.h"
#include "diskio_sdmmc.h"
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static const char* TAG = "vfs_fat_sdmmc";
static sdmmc_card_t* s_card = NULL;
static uint8_t s_pdrv = 0;
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static char * s_base_path = NULL;
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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)
{
const size_t workbuf_size = 4096;
void* workbuf = NULL;
FATFS* fs = NULL;
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if (s_card != NULL) {
return ESP_ERR_INVALID_STATE;
}
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// connect SDMMC driver to FATFS
BYTE pdrv = 0xFF;
if (ff_diskio_get_drive(&pdrv) != ESP_OK || pdrv == 0xFF) {
ESP_LOGD(TAG, "the maximum count of volumes is already mounted");
return ESP_ERR_NO_MEM;
}
s_base_path = strdup(base_path);
if(!s_base_path){
ESP_LOGD(TAG, "could not copy base_path");
return ESP_ERR_NO_MEM;
}
esp_err_t err = ESP_OK;
// not using ff_memalloc here, as allocation in internal RAM is preferred
s_card = malloc(sizeof(sdmmc_card_t));
if (s_card == NULL) {
err = ESP_ERR_NO_MEM;
goto fail;
}
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err = (*host_config->init)();
if (err != ESP_OK) {
ESP_LOGD(TAG, "host init returned rc=0x%x", err);
goto fail;
}
// configure SD slot
if (host_config->flags == SDMMC_HOST_FLAG_SPI) {
err = sdspi_host_init_slot(host_config->slot,
(const sdspi_slot_config_t*) slot_config);
} else {
err = sdmmc_host_init_slot(host_config->slot,
(const sdmmc_slot_config_t*) slot_config);
}
if (err != ESP_OK) {
ESP_LOGD(TAG, "slot_config returned rc=0x%x", err);
goto fail;
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}
// probe and initialize card
err = sdmmc_card_init(host_config, s_card);
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if (err != ESP_OK) {
ESP_LOGD(TAG, "sdmmc_card_init failed 0x(%x)", err);
goto fail;
}
if (out_card != NULL) {
*out_card = s_card;
}
ff_diskio_register_sdmmc(pdrv, s_card);
s_pdrv = pdrv;
ESP_LOGD(TAG, "using pdrv=%i", pdrv);
char drv[3] = {(char)('0' + pdrv), ':', 0};
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// connect FATFS to VFS
err = esp_vfs_fat_register(base_path, drv, mount_config->max_files, &fs);
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if (err == ESP_ERR_INVALID_STATE) {
// it's okay, already registered with VFS
} else if (err != ESP_OK) {
ESP_LOGD(TAG, "esp_vfs_fat_register failed 0x(%x)", err);
goto fail;
}
// Try to mount partition
FRESULT res = f_mount(fs, drv, 1);
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if (res != FR_OK) {
err = ESP_FAIL;
ESP_LOGW(TAG, "failed to mount card (%d)", res);
if (!(res == FR_NO_FILESYSTEM && mount_config->format_if_mount_failed)) {
goto fail;
}
ESP_LOGW(TAG, "partitioning card");
workbuf = ff_memalloc(workbuf_size);
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if (workbuf == NULL) {
err = ESP_ERR_NO_MEM;
goto fail;
}
DWORD plist[] = {100, 0, 0, 0};
res = f_fdisk(s_pdrv, plist, workbuf);
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if (res != FR_OK) {
err = ESP_FAIL;
ESP_LOGD(TAG, "f_fdisk failed (%d)", res);
goto fail;
}
size_t alloc_unit_size = esp_vfs_fat_get_allocation_unit_size(
s_card->csd.sector_size,
mount_config->allocation_unit_size);
ESP_LOGW(TAG, "formatting card, allocation unit size=%d", alloc_unit_size);
res = f_mkfs(drv, FM_ANY, alloc_unit_size, workbuf, workbuf_size);
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if (res != FR_OK) {
err = ESP_FAIL;
ESP_LOGD(TAG, "f_mkfs failed (%d)", res);
goto fail;
}
free(workbuf);
workbuf = NULL;
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ESP_LOGW(TAG, "mounting again");
res = f_mount(fs, drv, 0);
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if (res != FR_OK) {
err = ESP_FAIL;
ESP_LOGD(TAG, "f_mount failed after formatting (%d)", res);
goto fail;
}
}
return ESP_OK;
fail:
host_config->deinit();
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free(workbuf);
if (fs) {
f_mount(NULL, drv, 0);
}
esp_vfs_fat_unregister_path(base_path);
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ff_diskio_unregister(pdrv);
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free(s_card);
s_card = NULL;
free(s_base_path);
s_base_path = NULL;
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return err;
}
esp_err_t esp_vfs_fat_sdmmc_unmount(void)
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{
if (s_card == NULL) {
return ESP_ERR_INVALID_STATE;
}
// unmount
char drv[3] = {(char)('0' + s_pdrv), ':', 0};
f_mount(0, drv, 0);
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// release SD driver
esp_err_t (*host_deinit)(void) = s_card->host.deinit;
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ff_diskio_unregister(s_pdrv);
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free(s_card);
s_card = NULL;
(*host_deinit)();
esp_err_t err = esp_vfs_fat_unregister_path(s_base_path);
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free(s_base_path);
s_base_path = NULL;
return err;
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}