fastmath.h

C语言编写的监控中心终端程序。基于GPRS上传收发数据功能

#ifndef	__FASTMATH_H
#define	__FASTMATH_H

#define	__DIVF(x, f, l)		(((unsigned)(x) * (f) + ((unsigned)(f) - 1)) >> (l))

#define	DIV3_B(x)		__DIVF(x, 341, 10)		/* 0-1022 */
#define	DIV5_B(x)		__DIVF(x, 409, 11)		/* 0-684  */
#define	DIV7_B(x)		__DIVF(x,  73,  9)		/* 0-510  */
#define	DIV9_B(x)		__DIVF(x, 227, 11)		/* 0-413  */
#define	DIV10_B(x)		__DIVF(x,  51,  9)		/* 0-259  */
#define	DIV11_B(x)		__DIVF(x,  93, 10)		/* 0-1022 */

#define	DIV3_W(x)		__DIVF(x, 1365, 12)		/* 0-4094 */
#define	DIV5_W(x)		__DIVF(x,  819, 12)		/* 0-4094 */
#define	DIV7_W(x)		__DIVF(x,  585, 12)		/* 0-4094 */
#define	DIV9_W(x)		__DIVF(x,  455, 12)		/* 0-4094 */
#define	DIV10_W(x)		__DIVF(x,  819, 13)		/* 0-4109 */
#define	DIV11_W(x)		__DIVF(x, 5957, 16)		/* 0-7281 */

#define	DIV3(x)			DIV3_B(x)
#define	DIV5(x)			DIV5_B(x)
#define	DIV7(x)			DIV7_B(x)
#define	DIV9(x)			DIV9_B(x)
#define	DIV10(x)		DIV10_B(x)
#define	DIV11(x)		DIV11_B(x)

#endif	__FASTMATH_H