pixhawk 国外顶级开源飞控源码，兼容国内HT hawk-A-pixhawk HT hawk-A

开源四轴PIXHAWK源码，内容非常丰富，难懂，喜欢折腾的朋友可以研究！值的学习！(Open source four axis PIXHAWK, the content is very rich, difficult to understand, like friends can study tossing! Value learning!)