Update unit_gps.md

docs/zh_CN/product_documents/units/unit_gps.md

@@ -5,7 +5,7 @@
 
 ***
 
-:memo:**[描述](#描述)**      🛒**[购买链接](https://item.taobao.com/item.htm?spm=a1z10.3-c.w4002-1172588106.13.51a6425e6lnUwE&id=583664452054)**
+:memo:**[描述](#描述)**      :octocat:**[例程](#例程)**      🛒**[购买链接](https://item.taobao.com/item.htm?spm=a1z10.3-c.w4002-1172588106.13.51a6425e6lnUwE&id=583664452054)**
 
 <!-- :electric_plug:**[原理图](#原理图)** |:octocat:**[例程](#例程)**| -->
 
@@ -23,30 +23,6 @@
 <!-- -  GROVE接口，支持[UiFlow](http://flow.m5stack.com)编程，[Arduino](http://www.arduino.cc)编程 -->
 -  Unit内置两个Lego插件孔，方便与Lego件结合
 
-<!-- ## 例程
-
-```c++
-DHT12 dht12; //new a object
-Adafruit_BMP280 bme;
-
-float tmp = dht12.readTemperature();//temperature
-float hum = dht12.readHumidity();//humidity
-float pressure = bme.readPressure();//pressure
-```
-
-具体例程请点击[这里](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Units/ENV)。 -->
-
-<!-- ## 原理图
-
-<img src="assets/img/product_pics/units/env_sch.jpg"> -->
-
-<!-- ### 管脚映射
-
-<table>
- <tr><td>M5Core(GROVE C)</td><td>GPIO16</td><td>GPIO17</td></tr>
- <tr><td>GPS Unit</td><td>TXD</td><td>RXD</td></tr>
-</table> -->
-
 ## 应用
 
 - 车载定位
@@ -54,9 +30,51 @@ float pressure = bme.readPressure();//pressure
 
 ## 相关链接
 
-- [AT6558](http://www.icofchina.com/d/file/xiazai/2016-12-05/b1be6f481cdf9d773b963ab30a2d11d8.pdf)
-- [MAX2659](https://datasheets.maximintegrated.com/en/ds/MAX2659.pdf)
+- **[官方频道视频](https://i.youku.com/i/UNjE1ODA2MzE0OA==?spm=a2hzp.8253869.0.0)**
 
-- [CASIC多模卫星导航接收机协议规范](http://www.icofchina.com/d/file/xiazai/2017-05-02/ea0cdd3d81eeebcc657b5dbca80925ee.pdf)
+- **[官方论坛](http://forum.m5stack.com/)**
 
-- [上位机软件GnssToolKit3(Windows版本)](http://www.icofchina.com/d/file/xiazai/2018-05-23/2b29a8da746eec0ef1dcd9deae895298.zip)
+- **[数据手册]** - [AT6558](http://www.icofchina.com/d/file/xiazai/2016-12-05/b1be6f481cdf9d773b963ab30a2d11d8.pdf) - [MAX2659](https://datasheets.maximintegrated.com/en/ds/MAX2659.pdf)
+
+- **[CASIC多模卫星导航接收机协议规范](http://www.icofchina.com/d/file/xiazai/2017-05-02/ea0cdd3d81eeebcc657b5dbca80925ee.pdf)**
+
+- **[上位机软件GnssToolKit3(Windows版本)](http://www.icofchina.com/d/file/xiazai/2018-05-23/2b29a8da746eec0ef1dcd9deae895298.zip)**
+
+## 例程
+
+### 1. Arduino IDE
+
+```c++
+GPSRaw.begin(9600);
+
+if(GPSRaw.available()) {
+    int ch = GPSRaw.read();
+    Serial.write(ch);
+}
+```
+
+烧录[例程](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Modules/GPS/Arduino)之后，屏幕和串口显示终端会打印如下类似的信息
+
+```
+$GPGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5*02
+$BDGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5*13
+$GPGSV,1,1,00*79
+$BDGSV,1,1,00*68
+$GNRMC,,V,,,,,,,,,,M*4E
+$GNVTG,,,,,,,,,M*2D
+$GNZDA,,,,,,*56
+$GPTXT,01,01,01,ANTENNA OPEN*25
+```
+
+具体例程请点击[这里](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Units/GPS/Arduino)。
+
+<!-- ## 原理图
+
+<img src="assets/img/product_pics/units/env_sch.jpg"> -->
+
+### 管脚映射
+
+<table>
+ <tr><td>M5Core(GROVE C)</td><td>GPIO16</td><td>GPIO17</td></tr><td>5V</td><td>GND</td></tr>
+ <tr><td>GPS Unit</td><td>TXD</td><td>RXD</td></tr><td>5V</td><td>GND</td></tr>
+</table>