# 演示工程详细说明 ## 功能代码说明 演示工程主要演示了 FlashDB 从初始化，到示例运行的过程。 ### main.c 演示工程中，`main.c` 中的 `main 函数` 为入口函数，该函数分为两段，分别初始化了一个 KVDB 和 TSDB 对象，然后执行与之对应的示例函数，大致内容如下： ```C #ifdef FDB_USING_KVDB { /* KVDB Sample */ struct fdb_default_kv default_kv; default_kv.kvs = default_kv_table; default_kv.num = sizeof(default_kv_table) / sizeof(default_kv_table[0]); /* set the lock and unlock function if you want */ fdb_kvdb_control(&kvdb, FDB_KVDB_CTRL_SET_LOCK, lock); fdb_kvdb_control(&kvdb, FDB_KVDB_CTRL_SET_UNLOCK, unlock); /* Key-Value database initialization * * &kvdb: database object * "env": database name * "fdb_kvdb1": The flash partition name base on FAL. Please make sure it's in FAL partition table. * Please change to YOUR partition name. * &default_kv: The default KV nodes. It will auto add to KVDB when first initialize successfully. * NULL: The user data if you need, now is empty. */ result = fdb_kvdb_init(&kvdb, "env", "fdb_kvdb1", &default_kv, NULL); if (result != FDB_NO_ERR) { return -1; } /* run basic KV samples */ kvdb_basic_sample(&kvdb); /* run string KV samples */ kvdb_type_string_sample(&kvdb); /* run blob KV samples */ kvdb_type_blob_sample(&kvdb); } #endif /* FDB_USING_KVDB */ #ifdef FDB_USING_TSDB { /* TSDB Sample */ /* set the lock and unlock function if you want */ fdb_tsdb_control(&tsdb, FDB_TSDB_CTRL_SET_LOCK, lock); fdb_tsdb_control(&tsdb, FDB_TSDB_CTRL_SET_UNLOCK, unlock); /* Time series database initialization * * &tsdb: database object * "log": database name * "fdb_tsdb1": The flash partition name base on FAL. Please make sure it's in FAL partition table. * Please change to YOUR partition name. * get_time: The get current timestamp function. * 128: maximum length of each log * NULL: The user data if you need, now is empty. */ result = fdb_tsdb_init(&tsdb, "log", "fdb_tsdb1", get_time, 128, NULL); /* read last saved time for simulated timestamp */ fdb_tsdb_control(&tsdb, FDB_TSDB_CTRL_GET_LAST_TIME, &counts); if (result != FDB_NO_ERR) { return -1; } /* run TSDB sample */ tsdb_sample(&tsdb); } #endif /* FDB_USING_TSDB */ ``` #### 设置加锁与解锁 初始化 KVDB 及 TSDB 前通常需要通过 `control` 函数设置 `加锁回调` 与 `解锁回调` ： - KVDB： - fdb_kvdb_control(&kvdb, FDB_KVDB_CTRL_SET_LOCK, lock); - fdb_kvdb_control(&kvdb, FDB_KVDB_CTRL_SET_UNLOCK, unlock); - TSDB： - fdb_tsdb_control(&tsdb, FDB_TSDB_CTRL_SET_LOCK, lock); - fdb_tsdb_control(&tsdb, FDB_TSDB_CTRL_SET_UNLOCK, unlock); 对于裸机平台，加锁与解锁回调通常设置为关中断与开中断函数。而 RTOS 平台一般使用 mutex 互斥锁或 二值信号量 的 take 及 release 动作作为加锁与解锁的方式。 #### 模拟时间戳 对于 TSDB，正常项目中的时间戳应当通过 RTC 或者网络时钟方式来获取，但是这里为了增强演示工程的通用性，使用 `fdb_tsdb_control(&tsdb, FDB_TSDB_CTRL_GET_LAST_TIME, &counts);` 获取 TSDB 上次使用的时间戳，存入 `counts` 。每次使用 `get_time` 获取当前时间时，会对 `counts` 进行加一处理，模拟时间往前走的动作，避免重复。 所以，使用这种方法模拟的时间戳没有实时时间的含义，只是为了让每条记录插入的时间戳不重复。 #### 示例 本文主要讲解初始化相关代码功能，更多关于示例函数的详细讲解，请阅读对应的示例详解。 | 示例函数 | 说明 | 详解 | | ------------------------------ | ------------------ | ----------------------------------------- | | kvdb_basic_sample(&kvdb) | KVDB 基础示例 | [点击查看](zh-cn/sample-kvdb-basic) | | kvdb_type_string_sample(&kvdb) | 字符串类型 KV 示例 | [点击查看](zh-cn/sample-kvdb-type-string) | | kvdb_type_blob_sample(&kvdb) | blob 类型 KV 示例 | [点击查看](zh-cn/sample-kvdb-type-blob) | | tsdb_sample(&tsdb) | TSDB 基础示例 | [点击查看](zh-cn/sample-tsdb-basic) | ## 首次运行日志 下面将对日志进行分段讲解。 ### FAL 初始化 FAL 初始化时会打印 Flash 设备信息及分区表信息。 ``` [D/FAL] (fal_flash_init:65) Flash device | stm32_onchip | addr: 0x08000000 | len: 0x00040000 | blk_size: 0x00000800 |initialized finish. [I/FAL] ==================== FAL partition table ==================== [I/FAL] | name | flash_dev | offset | length | [I/FAL] ------------------------------------------------------------- [I/FAL] | fdb_tsdb1 | stm32_onchip | 0x0001a000 | 0x00002000 | [I/FAL] | fdb_kvdb1 | stm32_onchip | 0x0001c000 | 0x00004000 | [I/FAL] ============================================================= [I/FAL] Flash Abstraction Layer (V0.5.0) initialize success. ``` ### KVDB 初始化 KVDB 每次初始化时会检查扇区头部信息是否正确（扇区头部存储了一些属性信息），如果不正确，将会自动格式化该扇区。 Flash 首次使用时，通常需要格式化处理，所以首次初始化时的日志会含有格式化的信息。格式化成功后，后续每次初始化无需再次格式化。 ``` [FlashDB][kv][env] (src/fdb_kvdb.c:1599) KVDB in partition fdb_kvdb1, size is 16384 bytes. [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00000000). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00000800). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00001000). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00001800). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00002000). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00002800). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00003000). [FlashDB][kv][env] Sector header info is incorrect. Auto format this sector (0x00003800). [FlashDB][kv][env] All sector header is incorrect. Set it to default. [FlashDB] FlashDB V1.0.0 beta is initialize success. [FlashDB] You can get the latest version on https://github.com/armink/FlashDB . ``` ### TSDB 初始化 与 KVDB 类似，TSDB 首次初始化时，也会自动执行格式化动作。 ``` [FlashDB][tsl][log] Sector (0x00000000) header info is incorrect. [FlashDB][tsl][log] All sector format finished. [FlashDB][tsl][log] (src/fdb_tsdb.c:759) TSDB (log) oldest sectors is 0x00000000, current using sector is 0x00000000. ``` ### 运行示例 日志详解，请阅读 [示例文档](zh-cn/sample-kvdb-basic) ``` [FlashDB][sample][kvdb][basic] ==================== kvdb_basic_sample ==================== [FlashDB][sample][kvdb][basic] get the 'boot_count' value is 0 [FlashDB][sample][kvdb][basic] set the 'boot_count' value to 1 [FlashDB][sample][kvdb][basic] =========================================================== [FlashDB][sample][kvdb][string] ==================== kvdb_type_string_sample ==================== [FlashDB][sample][kvdb][string] create the 'temp' string KV, value is: 36C [FlashDB][sample][kvdb][string] get the 'temp' value is: 36C [FlashDB][sample][kvdb][string] set 'temp' value to 38C [FlashDB][sample][kvdb][string] delete the 'temp' finish [FlashDB][sample][kvdb][string] =========================================================== [FlashDB][sample][kvdb][blob] ==================== kvdb_type_blob_sample ==================== [FlashDB][sample][kvdb][blob] create the 'temp' blob KV, value is: 36 [FlashDB][sample][kvdb][blob] get the 'temp' value is: 36 [FlashDB][sample][kvdb][blob] set 'temp' value to 38 [FlashDB][sample][kvdb][blob] delete the 'temp' finish [FlashDB][sample][kvdb][blob] =========================================================== 省略 TSDB 初始化日志…… [FlashDB][sample][tsdb] ==================== tsdb_sample ==================== [FlashDB][sample][tsdb] append the new status.temp (36) and status.humi (85) [FlashDB][sample][tsdb] append the new status.temp (38) and status.humi (90) [FlashDB][sample][tsdb] [query_cb] queried a TSL: time: 1, temp: 36, humi: 85 [FlashDB][sample][tsdb] [query_cb] queried a TSL: time: 2, temp: 38, humi: 90 [FlashDB][sample][tsdb] [query_by_time_cb] queried a TSL: time: 1, temp: 36, humi: 85 [FlashDB][sample][tsdb] [query_by_time_cb] queried a TSL: time: 2, temp: 38, humi: 90 [FlashDB][sample][tsdb] query count is: 2 [FlashDB][sample][tsdb] set the TSL (time 1) status from 2 to 3 [FlashDB][sample][tsdb] set the TSL (time 2) status from 2 to 3 [FlashDB][sample][tsdb] =========================================================== ``` ## 二次运行日志 这里主要看下 KVDB 与 TSDB 初始化的日志，对比首次初始化可以发现，第二次启动时的初始化日志会相对少很多，主要少了格式化的过程。 ``` [D/FAL] (fal_flash_init:65) Flash device | stm32_onchip | addr: 0x08000000 | len: 0x00040000 | blk_size: 0x00000800 |initialized finish. [I/FAL] ==================== FAL partition table ==================== [I/FAL] | name | flash_dev | offset | length | [I/FAL] ------------------------------------------------------------- [I/FAL] | fdb_tsdb1 | stm32_onchip | 0x0001a000 | 0x00002000 | [I/FAL] | fdb_kvdb1 | stm32_onchip | 0x0001c000 | 0x00004000 | [I/FAL] ============================================================= [I/FAL] Flash Abstraction Layer (V0.5.0) initialize success. [FlashDB][kv][env] (D:/Program/STM32/FlashDB/src/fdb_kvdb.c:1599) KVDB in partition fdb_kvdb1, size is 16384 bytes. [FlashDB] FlashDB V1.0.0 beta is initialize success. [FlashDB] You can get the latest version on https://github.com/armink/FlashDB . 省略示例运行日志…… [FlashDB][tsl][log] (D:/Program/STM32/FlashDB/src/fdb_tsdb.c:759) TSDB (log) oldest sectors is 0x00000000, current using sector is 0x00000000. 省略示例运行日志…… ```