maina.s55

TI公司DSP/tms320c55x/tms320c54x系列的声学回声消除代码

*-------------------------------------------------------------------------*
*                                                                         *
*   THIS IS AN UNPUBLISHED WORK CONTAINING CONFIDENTIAL AND PROPRIETARY   *
*   INFORMATION.  IF PUBLICATION OCCURS, THE FOLLOWING NOTICE APPLIES:    *
*      "COPYRIGHT 2002 MIKET DSP SOLUTIONS, ALL RIGHTS RESERVED"          *
*                                                                         *
*-------------------------------------------------------------------------*/
	.mmregs
    .cpl_on
    .arms_on

;-------------------------------------------------------------------------
	.global _sRndSav
	.text
	
;-------------------------------------------------------------------------
MULT    			.set (31821)
INC     			.set (13849)
;-------------------------------------------------------------------------

;-------------------------------------------------------------------------
	.global                       _fill_rand
;-------------------------------------------------------------------------
_fill_rand
; S16 *psTo		= ar0
; S16 len		= t0
; S16 amp		= t1

	xar1 = #_sRndSav;
	ac0 = #MULT << #16;
	t0 = t0 - 1;
	brc0 = t0;
	
	localrepeat {
		ac1 = *ar1 * ac0;
		ac1 = ac1 + #INC;
		*ar1  = ac1;
		nop;
		nop;
		ac1 = t1 * *ar1;
		*ar0+ = HI(ac1 << #1);
	}
	return;
	
;-------------------------------------------------------------------------
	.global                       _stack_ini
;-------------------------------------------------------------------------
_stack_ini
; S16 sSize 	= t0
;
; returns 
; S16 *psWhere 	= ar0
;
	xar0 = xsp;
	mar (ar0 - t0);
	
	t0 = t0 - 1;
	csr = t0;
	ac0 = 0x2222;
	repeat (CSR)
		*ar0+ = ac0;
		
	return;
	
;-------------------------------------------------------------------------
	.global                       _stack_used
;-------------------------------------------------------------------------
_stack_used
; S16 *psStart 	= ar0
; S16 sSize		= t0
;
; returns 
; S16 sUsed		= t0
;
	mar (ar0 - t0);
	ac1 = 0x2222;
L01
		ac0 = ac1 - *ar0+;
		if (ac0 != #0) goto L02
		t0 = t0 - 1;
	if (t0 > #0) goto L01
L02
	return;	
	
;-------------------------------------------------------------------------
	.global _tstbc	
;-------------------------------------------------------------------------
_tstbc	
	t0 = t0 + #5
	if (t0 >= #0) goto L30
	t0 = #10;
	return;	
L30	
	t0 = #20;
	return;	
;-------------------------------------------------------------------------
	.global _main_stop
;-------------------------------------------------------------------------
_main_stop
	nop
	nop
	nop
	nop
	return