ChibiOS/os/various/littlefs_bindings/lfs_hal.c

159 lines
4.7 KiB
C

/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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.
*/
/*
* Parts of this file are:
*
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* @file lfs_hal.c
* @brief LittleFS-HAL bindings code.
*
* @addtogroup LITTLEFS_BINDINGS
* @{
*/
#include "lfs_hal.h"
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size) {
static const uint32_t rtable[16] = {0x00000000, 0x1db71064, 0x3b6e20c8,
0x26d930ac, 0x76dc4190, 0x6b6b51f4,
0x4db26158, 0x5005713c, 0xedb88320,
0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278,
0xbdbdf21c, };
const uint8_t *data = buffer;
for (size_t i = 0; i < size; i++) {
crc = (crc >> 4) ^ rtable[(crc ^ (data[i] >> 0)) & 0xf];
crc = (crc >> 4) ^ rtable[(crc ^ (data[i] >> 4)) & 0xf];
}
return crc;
}
void *lfs_malloc(size_t size) {
(void)size;
return NULL;
}
void lfs_free(void *p) {
(void)p;
}
int __lfs_read(const struct lfs_config *c, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size) {
BaseFlash *flp = (BaseFlash *)c->context;
flash_error_t err;
err = flashRead(flp,
(flash_offset_t)(block * c->block_size) + (flash_offset_t)off,
(size_t)size,
(uint8_t *)buffer);
if (err != FLASH_NO_ERROR) {
return LFS_ERR_IO;
}
return 0;
}
int __lfs_prog(const struct lfs_config *c, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size) {
BaseFlash *flp = (BaseFlash *)c->context;
flash_error_t err;
err = flashProgram(flp,
(flash_offset_t)(block * c->block_size) + (flash_offset_t)off,
(size_t)size,
(uint8_t *)buffer);
if (err != FLASH_NO_ERROR) {
return LFS_ERR_IO;
}
return 0;
}
int __lfs_erase(const struct lfs_config *c, lfs_block_t block) {
BaseFlash *flp = (BaseFlash *)c->context;
flash_error_t err;
err = flashStartEraseSector(flp, (flash_sector_t)block);
if (err != FLASH_NO_ERROR) {
return LFS_ERR_IO;
}
err = flashWaitErase(flp);
if (err != FLASH_NO_ERROR) {
return LFS_ERR_IO;
}
return 0;
}
int __lfs_sync(const struct lfs_config *c) {
BaseFlash *flp = (BaseFlash *)c->context;
(void)flp;
return 0;
}
int __lfs_lock(const struct lfs_config *c) {
BaseFlash *flp = (BaseFlash *)c->context;
flashAcquireExclusive(flp);
return 0;
}
int __lfs_unlock(const struct lfs_config *c) {
BaseFlash *flp = (BaseFlash *)c->context;
flashReleaseExclusive(flp);
return 0;
}
/** @} */