aic_cfg.asm

DSP c54** 实现的DTMF产生和解码 汇编原代码 包括了goerztel算法详细讲解

*******************************************************************************
* MODULE NAME:  aic_cfg.asm                                                   *
*                                                                             *
* AUTHOR:  Nathan Baltz                                                       *
*                                                                             *
* DESCRIPTION: Writes new configuration data into the AC01. Assuming a system *
*   which processes speech signals and requires the following parameters:     *
*                                                                             *
* 	Low pass filter cut-off frequency = 3.6 kHz                           *
*	Sampling rate = 9600 Hz                                               *
*	Assume the Master clock MCLK = 10.368 MHz                             *
*                                                                             *
*  This example demonstrates how to program these parameters - the registers  *
*  affected are:                                                              *
*                                                                             *
*	Register A which determines the division of the MCLK frequency to     *
*	generate the internal filter clock FCLK.  It also determines the -3   *
*       dB corner frequency of the low-pass filter.                           *
*  	Register B  which determines the division of FCLK to generate the     *
*       sampling (conversion) frequency.  It also determines the -3dB corner  *
*	frequency of the high-pass filter                                     *
*                                                                             *  
* DATE:  Summer 1996                                                          *
*                                                                             *
*******************************************************************************
*       (C) COPYRIGHT TEXAS INSTRUMENTS, INC. 1996                            *                
*******************************************************************************


	.mmregs
	.include  "aic_cfg.inc"
	.def	wrt_cnfg
	.def	wait_xrdy
	.text
	
wrt_cnfg:
	STM	#K_0,DXR1			;primary data word - a jump start!
	CALL	wait_xrdy
	STM	#K_PRIM_WORD,DXR1		;send primary word with D01-D00 = 11 to 
						;signify secondary communication
	CALL	wait_xrdy			;wait for data to be copied from DXR to XSR
	STM	#K_REG_1,DXR1			;change A register
	CALL	wait_xrdy
	STM	#K_PRIM_WORD,DXR1
	CALL	wait_xrdy
	STM	#K_REG_2,DXR1			;change B register
	CALL	wait_xrdy
	RET
;****************************************************************************
;	MODULE: WAIT_XRDY
;	PURPOSE: Wait for data to be copied from DXR to XSR before the next
;		 data is sent to DXR
;****************************************************************************
wait_xrdy:
	BITF	SPC1,0800h			;test XRDY bit in SPC1
	BC	wait_xrdy,NTC			;loop if not set
	RET