单片机与PC的通信格式：0xaa(头)+x轴高四位＋x轴低四位＋y轴高四位＋y轴低四位＋z轴高四位＋z轴低四位 （ 详见单片机源码） -Microcontroller and PC the communication format: 0xaa (head)+ x 4+ x-axis axis high-low 4+ y 4+ y axis axis high-low 4+ z+ z-axis four-axis high-low 4 (see SCM source)