20.asm

信号调制中的QPSK调制方法在DSP5402上面的实验

           .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
      .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
            .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 #0xb8e4,*AR7 ;被调的信息
	        LD *AR7,B
	        STL B,*AR5
	        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