想知道此汇编的含义或者程序流程图

只看该作者 · 2015-5-27 10:42

.mmregs
         .def start
K_IF80    .set 1
.bss x,1
.bss y,1
.bss SINSTP,1
.bss SIN25P,1
.data
sinx .usect "sinx",1000
cosx .usect "cosx",1000
fsin .usect "fsin",1000
fcos .usect "fcos",1000
qpsk .usect "qpsk",3000
STACK .usect "STACK",10
table .word -8*32768/10000---------------设初值
   .word -32*32768/10000
   .word -75*32768/10000
   .word -114*32768/10000
   .word -76*32768/10000
   .word 126*32768/10000
   .word 532*32768/10000
   .word 1081*32768/10000
   .word 1617*32768/10000
   .word 1949*32768/10000
   .word 1949*32768/10000
   .word 1617*32768/10000
   .word 1081*32768/10000
   .word 532*32768/10000
   .word 126*32768/10000
   .word -76*32768/10000
   .word -114*32768/10000
   .word -75*32768/10000
   .word -32*32768/10000
   .word -8*32768/10000
SINTAB:    .word 07FFFH,07FD8H,07F61H,07E9CH,07D89H,07C29H,07A7CH,07884H-----正弦映射表
         .word 07641H,073B5H,070E2H,06DC9H,06A6DH,066CFH,062F1H,05ED7H
         .word 05A82H,055F5H,05133H,04C3FH,0471CH,041CEH,03C56H,036BAH
         .word 030FBH,02B1FH,02528H,01F1AH,018F9H,012C8H,00C8CH,00648H
         .word 00000H,0F9B8H,0F374H,0ED38H,0E707H,0E0E6H,0DAD8H,0D4E1H
         .word 0CF05H,0C946H,0C3AAH,0BE32H,0B8E4H,0B3C1H,0AECDH,0AA0BH
         .word 0A57EH,0A129H,09D0FH,09931H,09593H,09237H,08F1EH,08C4BH
         .word 089BFH,0877CH,08584H,083D7H,08277H,08164H,0809FH,08028H
         .word 08001H,08028H,0809FH,08164H,08277H,083D7H,08584H,0877CH
         .word 089BFH,08C4BH,08F1EH,09237H,09593H,09931H,09D0FH,0A129H
         .word 0A57EH,0AA0BH,0AECDH,0B3C1H,0B8E4H,0BE32H,0C3AAH,0C946H
         .word 0CF05H,0D4E1H,0DAD8H,0E0E6H,0E707H,0ED38H,0F374H,0F9B8H
         .word 00000h,00648H,00C8CH,012C8H,018F9H,01F1AH,02528H,02B1FH
         .word 030FBH,036BAH,03C56H,041CEH,0471CH,04C3FH,05133H,055F5H
         .word 05A82H,05ED7H,062F1H,066CFH,06A6DH,06DC9H,070E2H,073B5H
         .word 07641H,07884H,07A7CH,07C29H,07D89H,07E9CH,07F61H,07FD8H
         .word 07FFFH
         .text
start:    SSBX FRCT
STM #STACK+10,SP
STM #sinx,AR1
STM #cosx,AR3
STM #fsin,AR4
STM #fcos,AR2
STM #qpsk,AR0
         ST #0,@SIN25P
   CALL SIN25K
   STM #x,AR5
   STM #y,AR7
   ST #0xe4e4,*AR7
   LD *AR7,B
   STL B,*AR5-----值放在*AR5和B的低16位
   ST #0,@SIN25P
   STM #7,AR6
QPSKSTART: LD *AR5,B
   AND #11,B
   SFTL B,5
   LD *AR5,A
   ROR A
   ROR A
   STL A,*AR5
   LD    SIN25P,A
   ADD    B,A
   ADD    #SINTAB,A
   STM    #255,BRC
   RPTB QPSKEND
   SUB    #SINTAB,A
         ADD    SINSTP,A
         AND    #07FH,A
         ADD    #SINTAB,A
QPSKEND: READA *AR0+
         BANZ QPSKSTART,*AR6-
here: B here
SIN25K:  STM #500,  BRC
      RPTB SINRET-1
      ST #K_IF80,SINSTP
      LD    SIN25P,A
      ADD    SINSTP,A
      AND    #07FH,A
      STL    A,SIN25P
      ADD    #SINTAB,A
      READA *AR1+
      LD    SIN25P,A
      ADD    #32,A
      AND    #07FH,A
ADD    #SINTAB,A
      READA *AR3+
      LD    SIN25P,A
      ADD    #64,A
      AND    #07FH,A
ADD    #SINTAB,A
      READA *AR4+
      LD    SIN25P,A
      ADD    #96,A
      AND    #07FH,A
ADD    #SINTAB,A
      READA *AR2+
SINRET    RET
.end···················很捉急