dirctaddr.asm

CHP 2 - Real-Time Digital Signal Processing: Implementations and Applications, Second Edition by Sen

; 
;  Project: Experiment 2.10.2 DSP Addressing Mode - Chapter 2 
;  File name: directAddr.asm
;
;  Description: This function uses DSP direct addressing mode 
;               to initialize an array
;
;  For the book "Real Time Digital Signal Processing: 
;                Implementation and Application, 2nd Ed"
;                By Sen M. Kuo, Bob H. Lee, and Wenshun Tian
;                Publisher: John Wiley and Sons, Ltd
;
;  Tools used: CCS v.2.12.07
;              TMS320VC5510 DSK Rev-C
;

* * * * * * * * * * * * * * * * * * * * * * * * * * *
*
*   dirctAddr: Direct Addressing Mode
*
* * * * * * * * * * * * * * * * * * * * * * * * * * *

    .def    _dirctAddr 
	
    .ref    _x

    .text

_dirctAddr                                     
;
;   Direct addressing
;	
              
    btstclr #14,*(ST1),TC1 ; Turn off CPL bits for direct addressing mode
    amov  #_x,XDP          ; Load direct addressing data-page pointer
    .dp   _x          
	
    mov   #9,@_x           ; Direct addressing mode
    mov   #3,@_x +1        ; Initialize x[8]={9,3,2,0,1,9,7,1}
    mov   #2,@_x+2	
    mov   #0,@_x+3	
    mov   #1,@_x+4	
    mov   #9,@_x+5	
    mov   #7,@_x+6
    mov   #1,@_x+7  
         
    xcc   continue,TC1         
    bset  CPL              ; Turn CPL bit back on             
continue
	
    ret	                      
	
    .end