针对卫星姿态控制中的一些常见运算的源码。如，四元素与欧拉角的互换，矩阵之间的运算等-against satellite attitude control of the operation some common source. For example, four elements and Euler angle swap between the matrix, etc.

485地址通信模式,中断数据收发，控制液晶显示屏，带矩阵按键操作-485 address communication mode, the interrupt data transmission, controls the liquid crystal display with matrix key operation