;=============================================================================
;
;   File math.inc									REFACTORED VERSION V2.99d
;
;
;   Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved.
;=============================================================================
; HISTORY
;  2011-08-03 : [mH] moving from OSTC code

	extern	convert_time			; converts hi:lo in minutes to hours (up:hi) and minutes (lo)
									; also usable for conversion of seconds to minutes and seconds
									; trashes xA, xB, xC

	extern	div16					; divA:2 = divA:2 / 2^WREG
									; trashes WREG

	extern	mult16					; divA:2 = divA:2 * 2^WREG
									; trashes WREG

	extern	sub16					; sub_c:2 = sub_a:2 - sub_b:2	with SIGNED   values
									; sets neg_flag if result is < 0
									; trashes WREG

	extern	subU16					; sub_c:2 = sub_a:2 - sub_b:2	with UNSIGNED values
									; sets neg_flag if result is < 0
									; trashes WREG

	extern	mult16x16				; xC:4 = xA:2 * xB:2			with UNSIGNED values
									; trashes PRODL, PRODH, WREG

	extern	div16x16				; xC:2 = xA:2 / xB:2 with xA as remainder
									; trashes xB, WREG

	extern	div32x16				; xC:4 = xC:4 / xB:2 with xA as remainder
									; trashes WREG

	extern	isr_shift_C31			; 24 bit shift, repeated WREG times,
									; dedicated to a specific usage

	extern	isr_unsigned_mult16x16	; isr_xC = isr_xA * _isr_xB		with UNSIGNED values
									; trashes PRODL, PRODH, WREG

	extern	isr_signed_mult16x16	; isr_xC = isr_xA * _isr_xB		with SIGNED values
									; trashes PRODL, PRODH, WREG