1-修改中控串口数据分析线程操作逻辑为双队列

2-数据库线程添加连续1000调用强制关闭一次数据库以清理内存

applications/sql/DB_SQLite.c

@@ -276,6 +276,8 @@ static void db_sqlite(void *parameter) {
     // 默认启用数据库
     db_enabled = RT_TRUE;
     static rt_bool_t  first_wait_done = RT_FALSE;
+    //连续链接次数
+    rt_int16_t op_link=0;
     while (1)
     {
         // 接收命令
@@ -284,12 +286,23 @@ static void db_sqlite(void *parameter) {
             if (first_wait_done)
             {
                 first_wait_done = RT_FALSE;
-                //sqlite3_exec(g_db, "PRAGMA shrink_memory;", 0, 0, 0);
+                sqlite3_exec(g_db, "PRAGMA shrink_memory;", 0, 0, 0);
                 sqlite3_close(g_db);
                 g_db=RT_NULL;
+                op_link=0;
             }
             continue;
-        }else{first_wait_done = RT_TRUE;}
+        }else{
+            if(op_link>1000)
+            {//连续操作数据库1000次后强制关闭防止内存占用
+                sqlite3_close(g_db);
+                g_db=RT_NULL;
+                op_link=0;
+            }
+            op_link++;
+
+            first_wait_done = RT_TRUE;
+        }
 
         //检查排队超时
         rt_tick_t now = rt_tick_get();
@@ -328,8 +341,8 @@ static void db_sqlite(void *parameter) {
                 return_disabled(&cmd);
                 continue;
             } else {
-                //限制缓存大小 (100KB)
-                //sqlite3_exec(g_db, "PRAGMA cache_size = -50;", 0, 0, 0);
+                //限制缓存大小 (KB)
+                sqlite3_exec(g_db, "PRAGMA cache_size = 8;", 0, 0, 0);
                 //设置临时存储为文件模式 (节省内存)
                 //sqlite3_exec(g_db, "PRAGMA temp_store = FILE;", 0, 0, 0);
                 //rt_kprintf("Opened database: %s\n", DB_NAME);