encode.asm

卷积码编码及其维特比译码的C54x Simulator仿真试验及matlab实现

	  .mmregs
STACK     .usect "STACK" ,10h
EncodeDP  .usect "Encode",0
CRAM1     .usect "Encode",1
CRAM2     .usect "Encode",1
CON_ROR   .usect "Encode",1
UnCodeBit .usect "Encode",1
CodeBits  .usect  "Encode",2

BIT_00  .set 10000000B
BIT_01  .set 01000000B
BIT_02  .set 00100000B
        .def start
start: STM #0,SWWSR
       STM #STACK+10h,SP
       STM #CON_ROR,AR2
       ST #0,*AR2
       STM #CodeBits,AR2
       ST #0,*AR2+
       ST #0,*AR2
       STM #UnCodeBit,AR2
       ST #0,*AR2
encodeloop
       LD #EncodeDP,DP
       LD CON_ROR ,A
       LD UnCodeBit,B
       SFTA A,-1
       SFTA B,7
       ADD B,A
       STL A,CON_ROR
       CALL con_one
       CALL con_two
       LD CRAM1,A
       LD CRAM2,B
       STM #CodeBits ,AR2
       STL A,*AR2+
       STL B,*AR2
       NOP
       B encodeloop
con_one
      STM #0,AR0
      BITF CON_ROR,BIT_00
      NOP
      NOP
      XC 1,TC
      MAR *AR0+
       
      BITF CON_ROR,BIT_02
      NOP
      NOP
      XC 1,TC
      MAR *AR0+
    
      MVKD AR0,CRAM1
      ANDM #1B,CRAM1
      RET
con_two
      STM #0,AR0
      BITF CON_ROR,BIT_00
      NOP
      NOP
      XC 1,TC
      MAR *AR0+
    
      BITF CON_ROR,BIT_01
      NOP
      NOP
      XC 1,TC
      MAR *AR0+
	
      BITF CON_ROR,BIT_02
      NOP
      NOP
      XC 1,TC
      ADD *AR0+,A
      MVKD AR0,CRAM2
      ANDM #1B,CRAM2
      RET
      .end