update: 更新README

README.md

@@ -1,10 +1,15 @@
-# LuatOS
 
+
+<p align="center"><a href="#" target="_blank" rel="noopener noreferrer"><img width="100" src="logo.jpg" alt="LuatOS logo"></a></p>
+
+<p align="center">
 [![license](https://img.shields.io/github/license/openLuat/LuatOS)](/LICENSE)
 [![rtt-w60x ci](https://github.com/openLuat/LuatOS/workflows/rtt-w60x/badge.svg)](https://github.com/openLuat/LuatOS/actions?query=workflow%3Artt-w60x)
 [![qemu ci](https://github.com/openLuat/LuatOS/workflows/qemu-vexpress-a9/badge.svg)](https://github.com/openLuat/LuatOS/actions?query=workflow%3Aqemu-vexpress-a9)
+<br>
 [![issue](https://img.shields.io/github/issues/openLuat/LuatOS)](https://github.com/openLuat/LuatOS/issues)
-
+</br>
+</p>
 LuatOS是运行在嵌入式硬件的实时操作系统,只需要少量内存的flash空间就能运行,用户编写lua代码就可完成各种功能
 
 Lua base RTOS, build for many embedded systems
@@ -16,13 +21,65 @@ Lua base RTOS, build for many embedded systems
 5. 在线升级
 6. 可裁剪,可扩展
 
-QQ群: 1061642968
+**QQ群: 1061642968**
 
 ----------------------------------------------------------------------------------
 ## 总体架构
 
 ![总体架构](system.jpg)
 
+## 代码示例节选
+
+详细代码请查阅 [script/app/playit/main.lua](script/app/playit/main.lua)
+
+```lua
+local sys = require("sys")
+
+sys.subscribe("WLAN_READY", function ()
+    print("!!! wlan ready event !!!")
+    -- 马上进行时间同步
+    socket.ntpSync()
+end)
+
+disp.init("ssd1306")
+display_str("Booting ...")
+
+-- 配网回调
+sys.subscribe("WLAN_PW_RE", function(ssid, password)
+    if ssid then
+        log.info(TAG, "airkiss GOT", ssid, password)
+        local conf = {ssid=ssid,password=password}
+        json.encodeFile(conf, "/wlan.json")
+    else
+        log.info(TAG, "airkiss fail")
+    end
+end)
+
+-- 业务流程, 联网后定时发送温度数据到服务器
+sys.taskInit(function()
+    while 1 do 
+        if wlan.ready() == 1 then
+            sys.wait(1000)
+            local temp = (sensor.ds18b20(28) or "")
+            display_str("Temp: " .. temp  .. " rssi:" .. tostring(wlan.rssi()))
+            local t = {"GET /api/w60x/report/ds18b20?mac=", wlan.get_mac(), "&temp=", temp, " HTTP/1.0\r\n",
+                    "Host: site0.cn\r\n",
+                    "User-Agent: LuatOS/0.1.0\r\n",
+                        "\r\n"}
+            socket.tsend("site0.cn", 80, table.concat(t))
+            log.info("network", "tsend complete, sleep 5s")
+            sys.wait(5000)
+        else
+            log.warn("main", "wlan is not ready yet")
+            sys.waitUntil("WLAN_READY", 30000)
+        end
+    end
+end)
+
+-- 主循环, 必须加
+sys.run()
+```
+
 ----------------------------------------------------------------------------------
 ## 资源
 
@@ -39,11 +96,11 @@ TODO: 构建工具链,IDE,刷机工具,等等
 
 ## 使用到的开源项目
 
-* [rt-thread](https://github.com/RT-Thread/rt-thread) 国产rtos
+* [rt-thread](https://github.com/RT-Thread/rt-thread) 国产rtos, 非常好用
 * [rtt-ds18b20](https://github.com/willianchanlovegithub/ds18b20) 在RT-Thread环境下读取ds18b20
 * [LuaTask](https://github.com/openLuat/Luat_2G_RDA_8955) 合宙LuaTask
-* [iRTU](https://github.com/hotdll/iRTU) 基于Luat的DTU
-* [airkissOpen](https://github.com/heyuanjie87/airkissOpen)
+* [iRTU](https://github.com/hotdll/iRTU) 基于Luat的DTU, 稀饭大神
+* [airkissOpen](https://github.com/heyuanjie87/airkissOpen) 参考其实现思路
 
 ## 授权协议