xiaoxiang781216 commented on code in PR #6829: URL: https://github.com/apache/incubator-nuttx/pull/6829#discussion_r957948586
########## drivers/mtd/mtd_config_fs.c: ########## @@ -0,0 +1,2652 @@ +/**************************************************************************** + * drivers/mtd/mtd_config_fs.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you 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. + * + * NVS: non volatile storage in flash + * + * Copyright (c) 2018 Laczen + * + * SPDX-License-Identifier: Apache-2.0 + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <sys/types.h> +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include <nuttx/crc8.h> +#include <debug.h> +#include <fcntl.h> +#include <errno.h> +#include <sys/poll.h> +#include <nuttx/kmalloc.h> +#include <nuttx/mtd/mtd.h> +#include <nuttx/mtd/configdata.h> + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#define CONFIG_MTD_NVS_WRITE_BLOCK_SIZE 4 +#define NVS_WRITE_BLOCK_SIZE CONFIG_MTD_NVS_WRITE_BLOCK_SIZE +#define MIN(a, b) ((a) > (b) ? (b) : (a)) + +/* MASKS AND SHIFT FOR ADDRESSES + * an address in nvs is an uint32_t where: + * high 2 bytes represent the sector number + * low 2 bytes represent the offset in a sector + */ +#define ADDR_SECT_MASK 0xFFFF0000 +#define ADDR_SECT_SHIFT 16 +#define ADDR_OFFS_MASK 0x0000FFFF + +/* Status return values */ + +#define NVS_STATUS_NOSPACE 1 + +#define NVS_BLOCK_SIZE 32 + +#define NVS_LOOKUP_CACHE_NO_ADDR 0xFFFFFFFF + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/** + * @brief Non-volatile Storage File system structure + * + * @param ate_wra: Allocation table entry write address. Addresses are stored + * as uint32_t: high 2 bytes are sector, low 2 bytes are offset in sector, + * @param data_wra: Data write address. + * @param sector_size File system is divided into sectors each sector + * should be multiple of pagesize + * @param sector_count Amount of sectors in the file systems + * @param write_block_size Alignment size + * @param nvs_lock Mutex + * @param flash_device Flash Device + */ + +struct nvs_fs +{ + FAR struct mtd_dev_s *mtd; /* mtd device */ + uint32_t ate_wra; /* next alloc table entry + * write address + */ + uint32_t data_wra; /* next data write address */ + uint16_t sector_size; /* filesystem is divided into + * sectors, sector size should be + * multiple of pagesize + */ + uint16_t page_size; /* page size */ + uint16_t sector_count; /* amount of sectors */ + bool ready; /* is the filesystem initialized */ + + uint32_t step_addr; /* for traverse */ + mutex_t nvs_lock; + +#ifdef CONFIG_MTD_CONFIG_FAIL_SAFE_LOOKUP_CACHE + uint32_t lookup_cache[CONFIG_MTD_CONFIG_FAIL_SAFE_LOOKUP_CACHE_SIZE]; +#endif +}; + +/* Allocation Table Entry */ + +begin_packed_struct struct nvs_ate +{ + uint32_t id; /* data id */ + uint16_t offset; /* data offset within sector */ + uint16_t len; /* data len within sector */ + uint16_t key_len; /* key string len */ + uint8_t part; /* part of a multipart data - future extension */ + uint8_t crc8; /* crc8 check of the ate entry */ + uint8_t expired; /* 0xFF-newest entry, others-old entry */ Review Comment: Ok -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
