说明：  做为现在的物联网行业，手持设备中，缺少不了的就是GPS定位功能。GPS模块和STM32的串口进行通信，将GPS的数据发送给M3的串口，由M3进行GPS协议的解码。解析出来后保存在响应的结构体中。在进行显示。
(As the current IoT industry, what handheld devices cannot lack is GPS positioning function. The GPS module communicates with the serial port of STM32 and sends GPS data to the serial port of M3, which decodes the GPS protocol. After parsing, save it in the corresponding structure. Displaying.)