libtblptrset.s

Audio compression on embedded board

/*********************************************************************
*                                                                    *
*                       Software License Agreement                   *
*                                                                    *
*   The software supplied herewith by Microchip Technology           *
*   Incorporated (the "Company") for its dsPIC controller            *
*   is intended and supplied to you, the Company's customer,         *
*   for use solely and exclusively on Microchip dsPIC                *
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        .equ __33FJ256GP710, 1
	.include "p33Fxxxx.inc"
        .include "g711lib_common.inc"
;------------------------------------------------------------------------------
;Global Declarations:
;------------------------------------------------------------------------------
        .global _libTblPtrSet
        .global _pTblpag
        .global _pTblOff
        .global _byteCount		
;------------------------------------------------------------------------------
;Variables stored in Program space
;------------------------------------------------------------------------------ 
        .section bss, near
_pTblpag:   .space 2 ; allocating 1 word of space for storing data table page-
                     ; register value. 
_pTblOff:   .space 2 ; allocating 1 word of space  for storing offset to the-
                     ; data table page.
_byteCount: .space 2 ; allocating one byte space for pointer to the bytes in-
                     ; a program memory word. 
;------------------------------------------------------------------------------
;Code Section in Program Memory
;------------------------------------------------------------------------------               

.section .text, code
/******************************************************************************
*
*  Function Name:       _libTblPtrSet
*
*  System:              RISC
*
*  Platform:            dsPIC33F
*  
*  Description:         This function does not take any inputs.This function is
*                       used for initializing a 4 byte pointer to data table
*                       containing encoded speech samples on program memory.It
*                       declares two pointer variables _pTblpag and _pTblOff. 
*                       pTblpag pointer variable is used to store the upper EA
*                       word and _pTblOff is used store the lower EA word of
*                       the program memory location.Working registers w2 and w3
*                       are used.  
*
***************************************************************************** */
_libTblPtrSet:
 
 ; Set up w2:w3 to point to the first byte of the encoded speech samples table.
         cp.b      w0 ,#0x01
         BRA NZ, table2
         mov     #tblpage(TABLENAME1), w3
         mov     #tbloffset(TABLENAME1), w2
         BRA     tblpagset
table2:  cp.b      w0,#0x02
         BRA NZ, table3
         mov     #tblpage(TABLENAME2), w3
         mov     #tbloffset(TABLENAME2), w2
         BRA     tblpagset
table3:  cp.b      w0,#0x03
         BRA NZ, table4
         mov     #tblpage(TABLENAME3), w3
		 mov     #tbloffset(TABLENAME3), w2
         BRA     tblpagset
table4:  cp.b      w0,#0x04
         BRA NZ, table5
         mov     #tblpage(TABLENAME4), w3
		 mov     #tbloffset(TABLENAME4), w2
         BRA     tblpagset
table5:  cp.b      w0,#0x05
         BRA NZ, tblpagset
         mov     #tblpage(TABLENAME5), w3
	     mov     #tbloffset(TABLENAME5), w2
         BRA     tblpagset
table6:  cp.b      w0,#0x06
         BRA NZ, table7
         mov     #tblpage(TABLENAME6), w3
		 mov     #tbloffset(TABLENAME6), w2
         BRA     tblpagset
table7:  cp.b      w0,#0x07
         BRA NZ, table8
         mov     #tblpage(TABLENAME7), w3
		 mov     #tbloffset(TABLENAME7), w2
         BRA     tblpagset
table8:  cp.b      w0,#0x08
         BRA NZ, table9
         mov     #tblpage(TABLENAME8), w3
		 mov     #tbloffset(TABLENAME8), w2
         BRA     tblpagset
table9:  cp.b      w0,#0x09
         mov     #tblpage(TABLENAME9), w3
		 mov     #tbloffset(TABLENAME9), w2 
         
tblpagset: mov     w3 , _pTblpag     ;Store the address of first byte
                                     ;in data table to _pTblpag                          
           mov     w2 , _pTblOff     ;Store the address of first byte
                                     ;in table to _pTblOff                                     
           clr     w4                  
           mov     w4 , _byteCount                         
                                     ;Initialize byte pointer in program
                                     ;memory word  to 0        
           return

;--------End of All Code Sections ---------------------------------------------

.end                               ;End of program code in this file