创建，添加sdram

rt-thread/components/drivers/wlan/SConscript

@@ -0,0 +1,30 @@
+from building import *
+
+cwd     = GetCurrentDir()
+CPPPATH = [cwd]
+
+src = Split('''
+        wlan_dev.c
+        ''')
+
+if GetDepend(['RT_WLAN_MANAGE_ENABLE']):
+    src += ['wlan_mgnt.c']
+
+if GetDepend(['RT_WLAN_MSH_CMD_ENABLE']):
+    src += ['wlan_cmd.c']
+
+if GetDepend(['RT_WLAN_PROT_ENABLE']):
+    src += ['wlan_prot.c']
+
+if GetDepend(['RT_WLAN_PROT_LWIP_ENABLE']):
+    src += ['wlan_lwip.c']
+
+if GetDepend(['RT_WLAN_CFG_ENABLE']):
+    src += ['wlan_cfg.c']
+
+if GetDepend(['RT_WLAN_WORK_THREAD_ENABLE']):
+    src += ['wlan_workqueue.c']
+
+group   = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_WIFI'], CPPPATH = CPPPATH)
+
+Return('group')