菜鳥(niǎo)求助C5402正弦波發(fā)生器

作者：dengjinmin　欄目：DSP技術(shù)

菜鳥(niǎo)求助C5402正弦波發(fā)生器
由于現(xiàn)在正在DSP學(xué)習(xí)初級(jí)階段，所以有好多問(wèn)題不懂，希望哪位達(dá)人可以幫忙解答，先在這里謝謝了。
小弟有個(gè)問(wèn)題比較疑惑，對(duì)于正弦波發(fā)生程序，如果要移相改怎么修改？例如把sin2x的程序改為sin(2x+40), 我在原來(lái)sin2x的程序上（匯編）把初始的0值改為20度對(duì)應(yīng)的弧度但是后面在利用倍角計(jì)算的時(shí)候出來(lái)的圖形不對(duì)，COPY的地方好似有點(diǎn)不對(duì)，希望高手可以解答，附程序：
   .title  "sin.asm"
   .mmregs
  .def  start
  ;.ref  d_xs,d_sinx,d_xc,d_cosx,sinx,cosx
sin_x:  .usect  "sin_x",360
STACK:  .usect  "STACK",10H
k_theta  .set 286
PA0      .set 0
start:
     .text
     STM  #STACK+10H,SP
     STM  k_theta,AR0
     STM  5719,AR1
     STM  #sin_x,AR6
     STM  #90,BRC
     RPTB loop1-1
     LDM  AR1,A
     LD   #d_xs,DP
     STL  A,@d_xs
     STL  A,@d_xc
     CALL sinx
     CALL cosx
     LD   #d_sinx,DP
     LD   @d_sinx,16,A
     MPYA @d_cosx
     STH  B,1,*AR6+
     MAR  *AR1+0
loop1:    STM  #sin_x+89,AR7
          STM  #88,BRC
          RPTB loop2-1
          LD *AR7-,A
          STL  A,*AR6+

loop2:
        STM  #179,BRC
        STM  #sin_x,AR7
        RPTB loop3-1
        LD *AR7+,A
        NEG  A
        STL  A,*AR6+
loop3:  STM  #sin_x,AR6
        STM  #1,AR0
        STM  #360,BK
loop4: PORTW  *AR6+0%,PA0
        B  loop4

sinx:
   .def d_xs,d_sinx
   .data
table_s:  .word  01c7H
          .word  030bH
          .word  0666H
          .word  1556H

d_coef_s    .usect   "coef_s",4
d_xs        .usect   "sin_vars",1
d_squr_xs   .usect   "sin_vars",1
d_temp_s    .usect   "sin_vars",1
d_sinx      .usect   "sin_vars",1
d_1_s       .usect   "sin_vars",1
          .text
          SSBX  FRCT
          STM  #d_coef_s,AR5
          RPT #3
          MVPD #table_s,*AR5+

          STM  #d_coef_s,AR3
          STM  #d_xs,AR2
          STM  #d_1_s,AR4
          ST #7FFFH,d_1_s
          SQUR  *AR2+,A
          ST  A,*AR2
          || LD *AR4,B
          MASR *AR2+,*AR3+,B,A
          MPYA  A
          STH  A,*AR2
          MASR *AR2-,*AR3+,B,A
          MPYA *AR2+
          ST  B,*AR2
          || LD *AR4,B

         MASR *AR2-,*AR3+,B,A
          MPYA *AR2+
          ST  B,*AR2
          || LD *AR4,B

          MASR *AR2-,*AR3+,B,A

           MPYA d_xs
           STH  B,d_sinx
           RET

cosx:

           .def d_xc,d_cosx
d_coef_c   .usect  "coef_c",4
           .data
table_c:  .word  0249H
          .word  0444H
          .word  0AABH
          .word  4000H

d_xc        .usect   "cos_vars",1
d_squr_xc   .usect   "cos_vars",1
d_temp_c    .usect   "cos_vars",1
d_cosx      .usect   "cos_vars",1
c_1_c       .usect    "cos_vars",1
          .text
          SSBX  FRCT
          STM  #d_coef_c,AR5
          RPT #3
          MVPD #table_c,*AR5+

          STM  #d_coef_c,AR3
          STM  #d_xc,AR2
          STM  #c_1_c,AR4
          ST #7FFFH,c_1_c
          SQUR  *AR2+,A
          ST  A,*AR2
   &n

2樓：	>>參與討論
作者： gudeng614 于 2006/12/24 14:19:00 發(fā)布：一般是用查找表做的吧

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菜鳥(niǎo)求助C5402正弦波發(fā)生器