1.
FAL组件
1.1
什么是FAL
FAL （Flash Abstraction Layer） Flash 抽象层，是对 Flash 及基于 Flash 的分区进行管理、操作的抽象层，对上层统一了 Flash 及 分区操作的 API （框架图如下所示），并具有以下特性：
支持静态可配置的分区表，并可关联多个 Flash 设备;
分区表支持 自动装载 。避免在多固件项目，分区表被多次定义的问题；
代码精简，对操作系统 无依赖 ，可运行于裸机平台，比如对资源有一定要求的 Bootloader;
统一的操作接口。保证了文件系统、OTA、NVM（例如：EasyFlash https://github.com/armink-rtt-pkgs/EasyFlash） 等对 Flash 有一定依赖的组件，底层 Flash 驱动的可重用性;
自带基于 Finsh/MSH 的测试命令，可以通过 Shell 按字节寻址的方式操作（读写擦） Flash 或分区，方便开发者进行调试、测试;
通过上图我们也可以清晰明了了，看到，FAL抽象层向下可以通过Flash硬件进行统一管理，当然也可以使用SFUD框架（串行Flash通用驱动库，这部分RT-Thread已完成官方框架的移植同时提供多个应用历程），而对上也可以使用如DFS、NVM提供的Flash硬件统一访问接口，方便用户更加直接方便对底层Flash硬件的访问操作。
注：非易失性存储器 （NVM）：在芯片电源关闭期间保存存储在其中的数据。因此，它被用于没有磁盘的便携式设备中的内存，以及用于可移动存储卡等用途。主要类型有：非易失性半导体存储器 （Non-volatile semiconductor memory， NVSM） 将数据存储在浮栅存储单元中，每个单元都由一个浮栅（floating-gate） MOSFET 组成。
关于存储，可以用一张图来解释：
来源：ROM、RAM、FLASH、NVM......一文搞定（https://blog.csdn.net/lianyunyouyou/article/details/118277207)
1.2
使用ENV配置FAL
在RT-Thread v4.1.0之前，FAL是作为软件包形式对用户开放使用的，而v4.1.0之后，FAL被RT-Thread官方重新定义为RTT组件的一部分，这样也能更加方便用户的开发。
我们下面正式讲解FAL组件的使用：
首先打开ENV工具，根据以下路径打开FAL使能 RT-Thread Components->[*]FAL： flash abstraction layer，由于我们后面会用到SFUD，所以这里把 FAL uses SFUD drivers 一并使能，并修改FAL设备名称为 W25Q128.
完成上述操作后保存退出，并使用 scons --target=mdk5 重新生成MDK5文件并打开
1.3
FAL SFUD 移植
为了提供示例，我们选用 W25Q128 spi flash 作为测试模块，并且使用SFUD框架对spi flash设备进行管理和驱动。
由于目前RT-Thread的SFUD已经对 W25Q128 完成支持，根据官方的使用手册，我们仅需编写 fal_cfg.h 文件完成对 FAL_FLASH_DEV_TABLE 及 FAL_PART_TABLE 的定义即可。文件存放路径：.\rt-thread\bsp\lpc55sxx\lpc55s69_nxp_evk\board\ports\fal_cfg.h
// fal.cfg.h/** Copyright (c) 2006-2023, RT-Thread Development Team** SPDX-License-Identifier: Apache-2.0** Change Logs:* Date Author Notes* 2023-04-21 Wangyuqiang the first version*//* Flash device Configuration */extern struct fal_flash_dev nor_flash0;/* flash device table */{ \&nor_flash0, \}/* Partition Configuration *//* partition table */{ \{FAL_PART_MAGIC_WROD, , NOR_FLASH_DEV_NAME, 0, 512 * 1024, 0}, \{FAL_PART_MAGIC_WROD, , NOR_FLASH_DEV_NAME, 512 * 1024, 1024 * 1024, 0}, \{FAL_PART_MAGIC_WROD, , NOR_FLASH_DEV_NAME, (512 + 1024) * 1024, 512 * 1024, 0}, \{FAL_PART_MAGIC_WROD, , NOR_FLASH_DEV_NAME, (512 + 1024 + 512) * 1024, 7 * 1024 * 1024, 0}, \{FAL_PART_MAGIC_WROD, , NOR_FLASH_DEV_NAME, (512 + 1024 + 512 + 7 * 1024) * 1024, 7 * 1024 * 1024, 0}, \}
此时编译的话是找不到该头文件的，需要我们在Keil中设置：
在RTT FAL组件中的SFUD提供的 fal_flash_dev 对象默认的nor_flash0参数中，flash大小默认为8M，而 W25Q128 最大最16M，我们可以选择在 .\rt-thread\components\fal\samples\porting\fal_flash_sfud_port.c文件中对struct fal_flash_dev nor_flash0 进行修改：
struct fal_flash_dev nor_flash0 ={.name = FAL_USING_NOR_FLASH_DEV_NAME,.addr = 0,.len = 16 * 1024 * 1024,.blk_size = 4096,.ops = {init, read, write, erase},.write_gran = 1};
当然也可以选择不进行修改，根据大佬的原话就是因为在调用初始化接口函数init后，会从flash设备读取正确的参数更新到nor_flash0表项中，我们在使用FAL组件前都需要调用FAL初始化函数fal_init，其内调用flash设备初始化函数fal_flash_init，最后会调用注册到fal_flash_dev设备表项中的初始化函数device_table[i]->ops.init，所以nor_flash0表项参数会在FAL初始化时被更新。
同时我们需要开启SFUD框架支持，打开ENV工具，由于SFUD的使用需要指定一个spi设备，这里我选择使用最近移植好的软件spi，路径 Hardware Drivers Config->On-chip Peripheral Drivers->[*] Enable soft SPI BUS-> [*] Enable soft SPI1 BUS (software simulation) ，这里我的测试开发板是恩智浦的LPC55S69-EVK，并且这款bsp的软件模拟spi由我本人对接，关于这部分的软件spi引脚定义可以选用默认即可，当然也可以使用自定义引脚，记住不要与其他引脚产生冲突。
此时我们回到ENV主界面，进入 RT-Thread Components->Device Drivers->Using Serial Flash Universal Driver ，此时我们才可以看到SFUD选项出现（如果没有使能spi是没法看到的），使能后保持默认即可
到这里，ENV的配置暂时告一段落！
1.4
FAL SFUD 测试用例
为了验证 W25Q128 及软件模拟spi在SFUD框架上是否能够成功运行，我们在 .\rt-thread\bsp\lpc55sxx\lpc55s69_nxp_evk\board\ports\ 下新建一个 soft_spi_flash_init.c 文件，代码如下
/** Copyright (c) 2006-2023, RT-Thread Development Team** SPDX-License-Identifier: Apache-2.0** Change Logs:* Date Author Notes* 2023-04-21 Wangyuqiang the first version*/static int rt_soft_spi_flash_init(void){int result = -1;result = rt_hw_softspi_device_attach("sspi1", "sspi10", cs_pin);rt_kprintf("value is %d\n",result);if(result == RT_EOK){rt_kprintf("rt_hw_softspi_device_attach successful!\n");}if (RT_NULL == rt_sfud_flash_probe("W25Q128", "sspi10")){return -RT_ERROR;}return RT_EOK;}INIT_COMPONENT_EXPORT(rt_soft_spi_flash_init);
这里我们需要指定一个片选引脚，我暂时使用了 sspi2 的SCK引脚作为片选，这里注意不要同时打开 sspi1 和 sspi2 ，后续我会专门上传一个通用GPIO作为片选引脚，到时候就不会产生问题了。然后软件spi设备的挂载使用的是 sspi1 bus 及 sspi10 device ，并且挂载flash设备到 sspi10 。
另外我们在 .\rt-thread\bsp\lpc55sxx\lpc55s69_nxp_evk\board\ports\ 下新建 fal_sample.c 文件，并编写测试代码：
//fal_sample.c/** Copyright (c) 2006-2023, RT-Thread Development Team** SPDX-License-Identifier: Apache-2.0** Change Logs:* Date Author Notes* 2023-04-21 Wangyuqiang the first version*/#include "rtthread.h"#include "rtdevice.h"#include "board.h"#include "fal.h"#define BUF_SIZE 1024static int fal_test(const char *partiton_name){int ret;int i, j, len;uint8_t buf[BUF_SIZE];const struct fal_flash_dev *flash_dev = RT_NULL;const struct fal_partition *partition = RT_NULL;if (!partiton_name){rt_kprintf("Input param partition name is null!\n");return -1;}partition = fal_partition_find(partiton_name);if (partition == RT_NULL){rt_kprintf("Find partition (%s) failed!\n", partiton_name);ret = -1;return ret;}flash_dev = fal_flash_device_find(partition->flash_name);if (flash_dev == RT_NULL){rt_kprintf("Find flash device (%s) failed!\n", partition->flash_name);ret = -1;return ret;}rt_kprintf("Flash device : %s ""Flash size : %dK \n""Partition : %s ""Partition size: %dK\n",partition->flash_name,flash_dev->len/1024,partition->name,partition->len/1024);/* erase all partition */ret = fal_partition_erase_all(partition);if (ret < 0){rt_kprintf("Partition (%s) erase failed!\n", partition->name);ret = -1;return ret;}rt_kprintf("Erase (%s) partition finish!\n", partiton_name);/* read the specified partition and check data */for (i = 0; i < partition->len;){rt_memset(buf, 0x00, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_read(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) read failed!\n", partition->name);ret = -1;return ret;}for(j = 0; j < len; j++){if (buf[j] != 0xFF){rt_kprintf("The erase operation did not really succeed!\n");ret = -1;return ret;}}i += len;}/* write 0x00 to the specified partition */for (i = 0; i < partition->len;){rt_memset(buf, 0x00, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_write(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) write failed!\n", partition->name);ret = -1;return ret;}i += len;}rt_kprintf("Write (%s) partition finish! Write size %d(%dK).\n", partiton_name, i, i/1024);/* read the specified partition and check data */for (i = 0; i < partition->len;){rt_memset(buf, 0xFF, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_read(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) read failed!\n", partition->name);ret = -1;return ret;}for(j = 0; j < len; j++){if (buf[j] != 0x00){rt_kprintf("The write operation did not really succeed!\n");ret = -1;return ret;}}i += len;}ret = 0;return ret;}static void fal_sample(void){/* 1- init */fal_init();if (fal_test("font") == 0){rt_kprintf("Fal partition (%s) test success!\n", "font");}else{rt_kprintf("Fal partition (%s) test failed!\n", "font");}if (fal_test("download") == 0){rt_kprintf("Fal partition (%s) test success!\n", "download");}else{rt_kprintf("Fal partition (%s) test failed!\n", "download");}}MSH_CMD_EXPORT(fal_sample, fal sample);
1.5
测试结果
到这里就可以进行编译下载了，成功后的截图如下：
2.
DFS文件系统
2.1
什么是DFS
DFS 是 RT-Thread 提供的虚拟文件系统组件，全称为 Device File System，即设备虚拟文件系统，文件系统的名称使用类似 UNIX 文件、文件夹的风格，目录结构如下图所示：
在 RT-Thread DFS 中，文件系统有统一的根目录，使用 / 来表示。而在根目录下的 f1.bin 文件则使用 /f1.bin 来表示，2018 目录下的 f1.bin 目录则使用 /data/2018/f1.bin 来表示。即目录的分割符号是 /，这与 UNIX/Linux 完全相同，与 Windows 则不相同（Windows 操作系统上使用 \ 来作为目录的分割符）。
2.2
DFS架构
RT-Thread DFS 组件的主要功能特点有：
为应用程序提供统一的 POSIX 文件和目录操作接口：read、write、poll/select 等。
支持多种类型的文件系统，如 FatFS、RomFS、DevFS 等，并提供普通文件、设备文件、网络文件描述符的管理。
支持多种类型的存储设备，如 SD Card、SPI Flash、Nand Flash 等。
DFS 的层次架构如下图所示，主要分为 POSIX 接口层、虚拟文件系统层和设备抽象层。
2.3
使用ENV配置DFS
打开ENV，进入路径 RT-Thread Components → DFS: device virtual file system ，使能 [*] DFS: device virtual file system
由于DFS使用的是POSIX接口，而dfs_posix.h已经在新版本中被移除了，如果想要兼容老版本，可以在menuconfig中使能 RT-Thread Components->[*] Support legacy version for compatibility
由于elmfat文件系统默认最大扇区大小为512，但我们使用的flash模块 W25Q128 的Flash扇区大小为4096，为了将elmfat文件系统挂载到W25Q128上，这里的 Maximum sector size 需要和W25Q128扇区大小保持一致，修改为4096，路径：RT-Thread Components → DFS: device virtual file system → [*] Enable elm-chan fatfs / elm-chan's FatFs, Generic FAT Filesystem Module
保存退出后使用 scons --target=mdk5 生成MDK5工程。
2.4
DFS挂载到FAL分区测试
这里增加FAL flash抽象层，我们将elmfat文件系统挂载到W25Q128 flash设备的filesystem分区上，由于FAL管理的filesystem分区不是块设备，需要先使用FAL分区转BLK设备接口函数将filesystem分区转换为块设备，然后再将DFS elmfat文件系统挂载到filesystem块设备上。
我们接着修改fal_sample.c文件，修改后代码：
/** Copyright (c) 2006-2023, RT-Thread Development Team** SPDX-License-Identifier: Apache-2.0** Change Logs:* Date Author Notes* 2023-04-21 Wangyuqiang the first version*/static int fal_test(const char *partiton_name){int ret;int i, j, len;uint8_t buf[BUF_SIZE];const struct fal_flash_dev *flash_dev = RT_NULL;const struct fal_partition *partition = RT_NULL;if (!partiton_name){rt_kprintf("Input param partition name is null!\n");return -1;}partition = fal_partition_find(partiton_name);if (partition == RT_NULL){rt_kprintf("Find partition (%s) failed!\n", partiton_name);ret = -1;return ret;}flash_dev = fal_flash_device_find(partition->flash_name);if (flash_dev == RT_NULL){rt_kprintf("Find flash device (%s) failed!\n", partition->flash_name);ret = -1;return ret;}rt_kprintf("Flash device : %s ""Flash size : %dK \n""Partition : %s ""Partition size: %dK\n",partition->flash_name,flash_dev->len/1024,partition->name,partition->len/1024);/* erase all partition */ret = fal_partition_erase_all(partition);if (ret < 0){rt_kprintf("Partition (%s) erase failed!\n", partition->name);ret = -1;return ret;}rt_kprintf("Erase (%s) partition finish!\n", partiton_name);/* read the specified partition and check data */for (i = 0; i < partition->len;){rt_memset(buf, 0x00, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_read(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) read failed!\n", partition->name);ret = -1;return ret;}for(j = 0; j < len; j++){if (buf[j] != 0xFF){rt_kprintf("The erase operation did not really succeed!\n");ret = -1;return ret;}}i += len;}/* write 0x00 to the specified partition */for (i = 0; i < partition->len;){rt_memset(buf, 0x00, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_write(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) write failed!\n", partition->name);ret = -1;return ret;}i += len;}rt_kprintf("Write (%s) partition finish! Write size %d(%dK).\n", partiton_name, i, i/1024);/* read the specified partition and check data */for (i = 0; i < partition->len;){rt_memset(buf, 0xFF, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_read(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) read failed!\n", partition->name);ret = -1;return ret;}for(j = 0; j < len; j++){if (buf[j] != 0x00){rt_kprintf("The write operation did not really succeed!\n");ret = -1;return ret;}}i += len;}ret = 0;return ret;}static void fal_sample(void){/* 1- init */fal_init();if (fal_test("font") == 0){rt_kprintf("Fal partition (%s) test success!\n", "font");}else{rt_kprintf("Fal partition (%s) test failed!\n", "font");}if (fal_test("download") == 0){rt_kprintf("Fal partition (%s) test success!\n", "download");}else{rt_kprintf("Fal partition (%s) test failed!\n", "download");}}MSH_CMD_EXPORT(fal_sample, fal sample);static void fal_elmfat_sample(void){int fd, size;struct statfs elm_stat;struct fal_blk_device *blk_dev;char str[] = "elmfat mount to W25Q flash.", buf[80];/* fal init */fal_init();/* create block device */blk_dev = (struct fal_blk_device *)fal_blk_device_create(FS_PARTITION_NAME);if(blk_dev == RT_NULL)rt_kprintf("Can't create a block device on '%s' partition.\n", FS_PARTITION_NAME);elsert_kprintf("Create a block device on the %s partition of flash successful.\n", FS_PARTITION_NAME);/* make a elmfat format filesystem */if(dfs_mkfs("elm", FS_PARTITION_NAME) == 0)rt_kprintf("make elmfat filesystem success.\n");/* mount elmfat file system to FS_PARTITION_NAME */if(dfs_mount(FS_PARTITION_NAME, "/", "elm", 0, 0) == 0)rt_kprintf("elmfat filesystem mount success.\n");/* Get elmfat file system statistics */if(statfs("/", &elm_stat) == 0)rt_kprintf("elmfat filesystem block size: %d, total blocks: %d, free blocks: %d.\n",elm_stat.f_bsize, elm_stat.f_blocks, elm_stat.f_bfree);if(mkdir("/user", 0x777) == 0)rt_kprintf("make a directory: '/user'.\n");rt_kprintf("Write string '%s' to /user/test.txt.\n", str);/* Open the file in create and read-write mode, create the file if it does not exist*/fd = open("/user/test.txt", O_WRONLY | O_CREAT);if (fd >= 0){if(write(fd, str, sizeof(str)) == sizeof(str))rt_kprintf("Write data done.\n");close(fd);}/* Open file in read-only mode */fd = open("/user/test.txt", O_RDONLY);if (fd >= 0){size = read(fd, buf, sizeof(buf));close(fd);if(size == sizeof(str))rt_kprintf("Read data from file test.txt(size: %d): %s \n", size, buf);}}MSH_CMD_EXPORT_ALIAS(fal_elmfat_sample, fal_elmfat,fal elmfat sample);
2.5
测试结果
测试结果如下：
3.
Easyflash移植到FAL分区
3.1
简述EasyFlash
关于EasyFlash的来源我们已经讲过了，此处不再赘述。EasyFlash(https://gitee.com/link?target=https%3A%2F%2Fgithub.com%2Farmink%2FEasyFlash)是一款开源的轻量级嵌入式Flash存储器库，方便开发者更加轻松的实现基于Flash存储器的常见应用开发。非常适合智能家居、可穿戴、工控、医疗、物联网等需要断电存储功能的产品，资源占用极低，支持各种 MCU 片上存储器。
EasyFlash不仅能够实现对产品的 设定参数 或 运行日志 等信息的掉电保存功能，还封装了简洁的 增加、删除、修改及查询 方法， 降低了开发者对产品参数的处理难度，也保证了产品在后期升级时拥有更好的扩展性。让Flash变为NoSQL（非关系型数据库）模型的小型键值（Key-Value）存储数据库。
3.2
EasyFlash软件包使用
打开ENV进入路径：RT-Thread online packages → tools packages → EasyFlash: Lightweight embedded flash memory library. ，选择软件包版本为最新版。
配置后退出ENV，同时使用 pkgs --update 下载软件包，然后再使用 scons --target=mdk5 重新生成MDK5文件
3.3
移植easyflash
下载完easyflash软件包后，我们复制 .\rt-thread\bsp\lpc55sxx\lpc55s69_nxp_evk\packages\EasyFlash-latest\ports\ef_fal_port.c 到目录 .\rt-thread\bsp\lpc55sxx\lpc55s69_nxp_evk\board\ports\easyflash\ef_fal_port.c ，双击打开该文件，完成以下修改：
// 修改 FAL_EF_PART_NAME 为 easyflash
// 修改环境变量内容为 {"boot_times", "0"}，这里我们先只设置一个开机次数static const ef_env default_env_set[] = {{"boot_times", "0"},};
3.4
编写Easyflash测试用例
/** Copyright (c) 2006-2023, RT-Thread Development Team** SPDX-License-Identifier: Apache-2.0** Change Logs:* Date Author Notes* 2023-04-21 Wangyuqiang the first version*/static int fal_test(const char *partiton_name){int ret;int i, j, len;uint8_t buf[BUF_SIZE];const struct fal_flash_dev *flash_dev = RT_NULL;const struct fal_partition *partition = RT_NULL;if (!partiton_name){rt_kprintf("Input param partition name is null!\n");return -1;}partition = fal_partition_find(partiton_name);if (partition == RT_NULL){rt_kprintf("Find partition (%s) failed!\n", partiton_name);ret = -1;return ret;}flash_dev = fal_flash_device_find(partition->flash_name);if (flash_dev == RT_NULL){rt_kprintf("Find flash device (%s) failed!\n", partition->flash_name);ret = -1;return ret;}rt_kprintf("Flash device : %s ""Flash size : %dK \n""Partition : %s ""Partition size: %dK\n",partition->flash_name,flash_dev->len/1024,partition->name,partition->len/1024);/* erase all partition */ret = fal_partition_erase_all(partition);if (ret < 0){rt_kprintf("Partition (%s) erase failed!\n", partition->name);ret = -1;return ret;}rt_kprintf("Erase (%s) partition finish!\n", partiton_name);/* read the specified partition and check data */for (i = 0; i < partition->len;){rt_memset(buf, 0x00, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_read(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) read failed!\n", partition->name);ret = -1;return ret;}for(j = 0; j < len; j++){if (buf[j] != 0xFF){rt_kprintf("The erase operation did not really succeed!\n");ret = -1;return ret;}}i += len;}/* write 0x00 to the specified partition */for (i = 0; i < partition->len;){rt_memset(buf, 0x00, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_write(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) write failed!\n", partition->name);ret = -1;return ret;}i += len;}rt_kprintf("Write (%s) partition finish! Write size %d(%dK).\n", partiton_name, i, i/1024);/* read the specified partition and check data */for (i = 0; i < partition->len;){rt_memset(buf, 0xFF, BUF_SIZE);len = (partition->len - i) > BUF_SIZE ? BUF_SIZE : (partition->len - i);ret = fal_partition_read(partition, i, buf, len);if (ret < 0){rt_kprintf("Partition (%s) read failed!\n", partition->name);ret = -1;return ret;}for(j = 0; j < len; j++){if (buf[j] != 0x00){rt_kprintf("The write operation did not really succeed!\n");ret = -1;return ret;}}i += len;}ret = 0;return ret;}static void fal_sample(void){/* 1- init */fal_init();if (fal_test("font") == 0){rt_kprintf("Fal partition (%s) test success!\n", "font");}else{rt_kprintf("Fal partition (%s) test failed!\n", "font");}if (fal_test("download") == 0){rt_kprintf("Fal partition (%s) test success!\n", "download");}else{rt_kprintf("Fal partition (%s) test failed!\n", "download");}}MSH_CMD_EXPORT(fal_sample, fal sample);static void fal_elmfat_sample(void){int fd, size;struct statfs elm_stat;struct fal_blk_device *blk_dev;char str[] = "elmfat mount to W25Q flash.", buf[80];/* fal init */fal_init();/* create block device */blk_dev = (struct fal_blk_device *)fal_blk_device_create(FS_PARTITION_NAME);if(blk_dev == RT_NULL)rt_kprintf("Can't create a block device on '%s' partition.\n", FS_PARTITION_NAME);elsert_kprintf("Create a block device on the %s partition of flash successful.\n", FS_PARTITION_NAME);/* make a elmfat format filesystem */if(dfs_mkfs("elm", FS_PARTITION_NAME) == 0)rt_kprintf("make elmfat filesystem success.\n");/* mount elmfat file system to FS_PARTITION_NAME */if(dfs_mount(FS_PARTITION_NAME, "/", "elm", 0, 0) == 0)rt_kprintf("elmfat filesystem mount success.\n");/* Get elmfat file system statistics */if(statfs("/", &elm_stat) == 0)rt_kprintf("elmfat filesystem block size: %d, total blocks: %d, free blocks: %d.\n",elm_stat.f_bsize, elm_stat.f_blocks, elm_stat.f_bfree);if(mkdir("/user", 0x777) == 0)rt_kprintf("make a directory: '/user'.\n");rt_kprintf("Write string '%s' to /user/test.txt.\n", str);/* Open the file in create and read-write mode, create the file if it does not exist*/fd = open("/user/test.txt", O_WRONLY | O_CREAT);if (fd >= 0){if(write(fd, str, sizeof(str)) == sizeof(str))rt_kprintf("Write data done.\n");close(fd);}/* Open file in read-only mode */fd = open("/user/test.txt", O_RDONLY);if (fd >= 0){size = read(fd, buf, sizeof(buf));close(fd);if(size == sizeof(str))rt_kprintf("Read data from file test.txt(size: %d): %s \n", size, buf);}}MSH_CMD_EXPORT_ALIAS(fal_elmfat_sample, fal_elmfat,fal elmfat sample);static void easyflash_sample(void){/* fal init */fal_init();/* easyflash init */if(easyflash_init() == EF_NO_ERR){uint32_t i_boot_times = NULL;char *c_old_boot_times, c_new_boot_times[11] = {0};/* get the boot count number from Env */c_old_boot_times = ef_get_env("boot_times");/* get the boot count number failed */if (c_old_boot_times == RT_NULL)c_old_boot_times[0] = '0';i_boot_times = atol(c_old_boot_times);/* boot count +1 */i_boot_times ++;rt_kprintf("===============================================\n");rt_kprintf("The system now boot %d times\n", i_boot_times);rt_kprintf("===============================================\n");/* interger to string */sprintf(c_new_boot_times, "%d", i_boot_times);/* set and store the boot count number to Env */ef_set_env("boot_times", c_new_boot_times);ef_save_env();}}MSH_CMD_EXPORT(easyflash_sample, easyflash sample);
3.5
测试结果
打开串口助手，输入命令：
msh />easyflash_sample第一次命令调用：
第二次RESET开发板后调用：
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