一种串口+按键控制步进电机的c语言程序，可以按加速，减速键控制速度，按逆时针/顺时针键控制转向，按暂停键使步进电机暂停。-A kind of serial+ key control stepper motor c language program, can be speed up, slow down keys to control speed, according to counter-clockwise/clockwise shift key control, stepping motor

国产密码SM2、SM3、SM4的C语言实现，并且附带检测程序做出相应赋值检测- The domestic password SM2, SM3, SM4 C language, and with testing procedures to make the appropriate assignment test