/*--------------------------------------------------------------------------------
 Function name: void sin_cos(sincos_struct *p, int angle)
---------------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------------
fuction return structure statement
---------------------------------------------------------------------------------*/
typedef struct
{	int	inv_step;	//Q15, 步長的倒數, 對于一個360點的正弦表，其步長為1度，由于
					//1度用無符號16進制可表示成0xffff/360=182.04166667
					//所以invstep=1/182.04166667=0.0054932=0xB4(Q15)
	int k_cosx;		//cosx=sin(x+pi/2), K_cosx=pi/2=index_max/4=360/4 for a 360 point table
	int sinx;		//Q15, 返回angle的正弦值
	int cosx;		//Q15, 返回angle的余弦值
}sincos_struct;
/*---------------------------------------------------------------------------------
extern function statement
---------------------------------------------------------------------------------*/
void sin_cos(sincos_struct *p, int angle);