#define MCLK                    67500000        //67.5MHz#define MOTOR_SEVER_FRE         1000            //20kHz#define MOTOR_CONT              (MCLK/2/2/MOTOR_SEVER_FRE)#define MOTOR_MID               (MOTOR_CONT/2)extern void init_MotorPort(void);extern void SetPWM(int value);extern void exit_MotorPort(void);