基于DSP的正弦波信號發生器源程序(匯編語言)

正弦波信號發生器源程序

D.1用泰勒級數開展開法計算一個角度的余弦值

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

* 用泰勒級數開展開法計算一個角度的余弦值 *

* cos(x)=1-x*x/2(1-x*x/3*4(1-x*x/5*6(x*x/7*8))) *

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

.title"cosx.asm"

.mmregs

.defstart

STACK:.usect"STACK",10

Start:STM#STACK+10,SP

LD#d_x,DP

ST#6487H,d_x;x-->d_x

CALLcos_start

end:Bend

cos_start:

.defcos_start

d_coeff.usect"coeff",4

.data

table:.word0249H;c1=1/(7*8)

.word0444H;c2=1/(5*6)

.word0AABH;c3=1/(3*4)

.word4000H;c4=1/(1*2)

d_x.usect"cos_vars",1

d_squr_x .usect"cos_vars",1

d_temp.usect"cos_vars",1

d_cosx.usect"cos_vars",1

c_1.usect"cos_vars",1

.text

SSBXFRCT

STM#d_coeff,AR5

RPT#3

MVPD#table,*AR5+

STM#d_coeff,AR3

STM#d_x,AR2

STM#c_1,AR4

ST#7FFFH,c_1

SQUR*AR2+,A;A=x^2

STA,*AR2;(AR2)=x^2

||LD*AR4,B;B=1

MASR*AR2+,*AR3+,B,A;A=1-x^2/56,T=x^2

MPYAA;A=T*A=x^2(1-x^2/56)

STHA,*AR2;(d_temp)=x^2(1-x^2/56)

MASR*AR2-,*AR3+,B,A;A=1-x^2/30(1-x^2/56),T=x^2(1-x^2/56)

MPYA*AR2+;B=x^2(1-x^2/30(1-x^2/56))

STB,*AR2;(d_temp)=x^2(1-x^2/30(1-x^2/56))

||LD*AR4,B;B=1

MASR*AR2-,*AR3+,B,A;A=1-x^2(1-x^2/30(1-x^2/56))

SFTAA,-1,A;A右移一位即A除以2

NEGA

MPYA*AR2+;B=-x^2/2(1-x^2/12(1-x^2/30(1-x^2/56)))

MAR*AR2+

RETD

ADD*AR4,16,B;B=1-x^2/2(1-x^2/12(1-x^2/30(1-x^2/56)))

STHB,*AR2;cos(theta)

RET

.end

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

*中斷向量文件vectors.asm

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

.title "vectors.asm"

.refstart

.sect ".vectors"

Bstart

.end

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

*鏈接命令文件

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

vectors.obj

cosx.obj

-Ocosx.out

-mcosx.map

-estart

MEMORY

{

PAGE 0:

EPROM:org=0090H,len=0F70H

VECS:org=0080H,len=0010H

PAGE 1:

SPRAM:org=1000H,len=1000H

DARAM:org=2000H,len=2000H

}

SECTIONS

{

.

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