说明：  本文将从头从零开始向大家讲解PX4项目有关源代码方面的内容，希望借此抛砖引玉，共同玩好PX4（Pixhawk）这个开源飞控。 入门PX4源码，应该从下面两个软件入手： 1、 PX4 Toolchain，从名称上可以看出，这是一个PX4项目的软件工具集，集成了PX4调试console，编译环境（Eclipse），驱动等 2、 GIT工具，这是一个专门应用于从GitHub网站上下载源代码的工具。Github是国外一个专门发布开源代码的网站，在上面可以找到很多的开源项目，当然，Pixhawk项目的源码也在它上面发布，所以我们要获取Pixhawk的源码必须得在电脑里装一个GIT工具.
(This article will start from scratch to explain the Px4 project related to the source code content, hoping to use this to open source Px4 (pixhawk) this open source flight control. To get started with Px4 source code, you should start with the following two softwares: 1. Px4 toolchain, as can be seen from the name, is a software tool set of Px4 project, which integrates Px4 debugging console, compilation environment (eclipse), driver, etc 2. Git tool, which is a special tool for downloading source code from GitHub website. GitHub is a foreign website dedicated to publishing open source code. You can find a lot of open source projects on it. Of course, the source code of pixhawk project is also published on it, so we must install a git tool in the computer to obtain the source code of pixhawk)