void init_PCA()
{                                                                                         	CMOD=0x00;					
 	CCAPM1=0x02;
	CCAPM0=0x02;
	CL=0;
	CH=0;
	PCA_PWM0=0x00;
	CCON=0x40;
    	IN1=0;
    	IN2=1;
	IN3=0;
    	IN4=1;
}

void go()			//小车直行
{
	CCAP1H=0x64;   
	CCAP0H=0x64;	
}

void right()			//小车右转
{
	CCAP1H=0x7d;   
	CCAP0H=0xaa;		
}

void left()			//小车左转
{
	CCAP1H=0xaa;  
	CCAP0H=0x7d;	
}