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List 1. Complete Software Listing for a Sinewave Generator

**************************************************************************

* TITLE : THS5651 Interface routine *

* FILE : DAC.ASM *

* FUNCTION : MAIN *

* PROTOTYPE : void MAIN () *

* CALLS : N/A *

* PRECONDITION : N/A *

* POSTCONDITION : N/A *

* DESCRIPTION : main routine is used the generated a sine wave *

* : input for THS56x1 EVM using the ’C542 DSKplus board *

* AUTHOR : AAP Application Group, L. Philipose, Dallas *

* : CREATED 1999(C) BY TEXAS INSTRUMENTS INCORPORATED. *

* REFERENCE : TMS320C54x User’s Guide, TI 1997 *

* : Data Aquisation Circuits, TI 1999 *

**************************************************************************

.title “THS56x1 sine wave”

.mmregs

.width 80

.length 55

.version 542

.sect ”.vectors”

.copy ”vectors.asm”

.sect ”.data”

*global Variables

.global _sinewave

*Local Varibles

AD_DP .usect ”.variabl”, 0 ;

TEMP .usect ”.variabl”, 1 ; temporary variable

DAC_Sample .usect ”.variabl”, 1 ; last readed sample of channel 2

* Address Decoder constants:

DAC .set 00003h ; activate A2 when DAC1 is choosen

.sect ”.SINE”

sinevals:

.word 07FC0h ;sine wave table.

.word 0A800h ;

.word 0C780h ;

.word 0E300h ;

.word 0F380h ;

.word 0FFC0h ;

.word 0FEC0h ;

.word 0EB00h ;

.word 0D200h ;

.word 0B900h ;

.word 09440h ;

.word 07380h ;

.word 05280h ;

.word 03080h ;

.word 01900h ;

.word 00900h ;

.word 00000h ;

.word 01500h ;

.word 02A00h ;

.word 04580h ;

.word 05E80h ;

.sect ”.text”

_sinewave:

_MAIN:

START:

INITIALIZATION:

* copy interrupt routine, which are uncritical by the EVM to the IRQ table location:

DP = #1;

AR7 =#00200h;

Software SLAU032C– February 2001– Revised April 2011

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