decimate.asm

来自「GSM移动通信系统中上变器的DSP实现程序」· 汇编 代码 · 共 87 行

     .title "Decimate.asm"
    .include   "Init_54x.asm"
    
    .def MAIN
    
IDBASE       .set  12H
QDBASE       .set  13H
IDAR2        .set  14H
QDAR2        .set  15H
IDECIM       .set  30H
IDECI1       .set  31H
IDECI2       .set  32H
IDECI3       .set  33H
IDECI4       .set  34H
QDECIM       .set  35H
QDECI1       .set  36H
QDECI2       .set  37H
QDECI3       .set  38H
QDECI4       .set  39H
K_DECLG      .set  80
INDECIM      .set  100H
QUDECIM      .set  180H
   
MAIN   ST  #INDECIM,IDAR2
       ST  #QUDECIM,QDAR2
       STM #INDECIM,AR2
LOOP   IDLE #1
       STM  #K_DECLG,BK
       STM #1,AR0
       STM #DECIMTAB,AR3
       MVDK  IDAR2,AR2 


   MVKD  #IDECIM+K_AD,*AR2+%
   MVKD  #IDECI1+K_AD,*AR2+%
   MVKD  #IDECI2+K_AD,*AR2+%
   MVKD  #IDECI3+K_AD,*AR2+%
   MVKD  #IDECI4+K_AD,*AR2+%
   MVKD  AR2,IDAR2
  
   RPTZ  A,#K_DECLG-1
   MAC   *AR2+0%,*AR3+,A
   LD    #7FFFH,15,B
   MIN   A
   LD    #-7FFFH,15,B
   MAX   A 
   STH   A,IDBASE
   STM   #K_DECLG,BK
   STM   #1,AR0
   STM   #DECIMTAB,AR3
   
   MVDK  QDAR2,AR2
   MVKD  #QDECIM+K_AD,*AR2+%
   MVKD  #QDECI1+K_AD,*AR2+%
   MVKD  #QDECI2+K_AD,*AR2+%
   MVKD  #QDECI3+K_AD,*AR2+%
   MVKD  #QDECI4+K_AD,*AR2+%
   MVKD  AR2,QDAR2

   RPTZ  A,#K_DECLG-1
   MAC   *AR2+0%,*AR3+,A
   LD    #7FFFH,15,B
   MIN   A
   LD    #-7FFFH,15,B
   MAX   A 
   STH   A,QDBASE
   B     LOOP

DECIMTAB:
  .word  -8,-11,-16,-19,-18,-9,6,28
  .word  51,70,77,67,35,-15,-78,-138
  .word  -180,-186,-145,-54,74,218,343,413
  .word  395,270,45,-252,-563,-816,-930,-837
  .word -490,116,945,1916,2917,3820,4504,4872
  .word  4872,4504,3820,2917,1916,945,116,-490
  .word  -837,-930,-816,-563,-252,45,270,395
  .word 413,343,218,74,-54,-145,-186,-180
  .word -138,-78,-15,35,67,77,70,51
  .word 28,6,-9,-18,-19,-16,-11,-8
  .END