用单片机产生正弦波程序培训资料.doc

用单片机产生正弦波程序

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用单片机产生正弦波程序

要用到数模转换DAC0832
       MOV  DPTR,#SINTAB         ;正弦表写入内部RAM6DH-7FH
       MOV  R0,#6DH
LOOP:  CLR  A
       MOVC A,@A+DPTR
       MOV  @R0,A
       INC  DPTR
       INC  R0
       CJNE R0,#80H,LOOP
       MOV  DPTR,#7FFFH          ;设置D/A转换器的端口地址
       MOV  R0,#6DH               ;设置正弦表指针
LOOP1: MOV  A,@R0                ;查表
       MOVX @DPTR,A              ;D/A转换
       ACALL  DELAY              ;延时，等待转换结束
       DEC  R0                     ;正弦表位移量增量
       CJNE R0, #6DH,LOOP1          ;第一象限输出完？
LOOP2: MOV  A,@R0                ;查表
       MOVX @DPTR,A              ;D/A转换
       acall  DELAY             ;延时，等待转换结束
       DEC  R0                     ;正弦表位移量减量
       CJNE R0, #6DH,LOOP2          ;第二象限输出完？
LOOP3: MOV  A,@R0                ;查表
       CPL A                        ;表值取反
       MOVX @DPTR,A              ;D/A转换
       ACALL  DELAY             ;延时，等待转换结束
       INC  R0                     ;正弦表位移量增量
      CJNE R0,#7FH,LOOP3          ;第三象限输出完？
LOOP4:MOV  A,@R0                ;查表
      CPL  A                      ;表值取反
      MOVX @DPTR,A              ;D/A转换
      ACALL  DELAY             ;延时，等待转换结束
      DEC  R0                     ;正弦表位移量减量
      CJNE R0,#6DH,LOOP4          ;第四象限输出完？
      SJMP LOOP1
DELAY:MOV  R7,#200               ; 延时50ms
DEL1:MOV R6,#123
      NOP
DEL2：JNZ R6,DEL2
      DJNZ R7,DEL1
      RET
SINTAB:
DB 80H,83H,86H,89H,8DH,90H,93H,96H
DB 99H,9CH,9FH,0A2H,0A5H,0A8H,0ABH,0AEH
DB 0B1H,0B4H,0B7H,0BAH,0BCH,0BFH,0C2H,0C5H
DB 0C7H,0CAH,0CCH,0CFH,0D1H, 0D4H,0D6H,0D8H
DB 0DAH,0DDH,0DFH,0E1H,0E3H, 0E5H,0E7H,0E9H
DB 0EAH,0ECH,0EEH,0EFH,0F1H, 0F2H,0F4H,0F5H
DB 0F6H,0F7H,0F8H,0F9H,0FAH, 0FBH,0FCH,0FDH
DB 0FDH,0FEH,0FFH,0FFH,0FFH, 0FFH,0FFH,0FFH
DB 0FFH,0FFH,0FFH,0FFH,0FFH, 0FFH,0FEH,0FDH
DB 0FDH,0FCH,0FBH,0FAH,0F9H, 0F8H,0F7H,0F6H
DB 0F5H,0F4H,0F2H,0F1H,0EFH, 0EEH,0ECH,0EAH
DB 0E9H,0E7H,0E5H,0E3H,0E1H, 0DEH,0DDH,0DAH
DB 0D8H,0D6H,0D4H,0D1H,0CFH, 0CCH,0CAH,0C7H
DB 0C5H,0C2H,0BFH,0BCH,0BAH, 0B7H,0B4H,0B1H
DB 0AEH,0ABH,0A8H,0A5H,0A2H, 9FH, 9CH, 99H
DB 96H, 93H, 90H, 8DH, 89H, 86H, 83H, 80H
DB 80H, 7CH, 79H, 78H 72H, 6FH, 6CH, 69H
DB 66H, 63H, 60H, 5DH, 5AH, 57H, 55H, 51H
DB 4EH, 4CH, 48H, 45H, 43H, 40H, 3DH, 3AH
DB 38H, 35H, 33H, 30H, 2EH, 2BH, 29H, 27H
DB 25H, 22H, 20H, 1EH, 1CH, 1AH, 18H, 16H
DB 15H, 13H, 11H, 10H, 0EH, 0DH, 0BH, 0AH
DB 09H, 08H, 07H, 06H, 05H, 04H, 03H, 02H
DB 02H, 01H, 00H, 00H, 00H, 00H, 00H, 00H
DB 00H, 00H, 00H, 00H, 00H, 00H, 01H, 02H
DB 02H, 03H, 04H, 05H, 06H, 07H, 08H, 09H
DB 0AH, 0BH, 0DH, 0EH, 10H, 11H, 13H, 15H
DB 16H, 18H, 1AH, 1CH, 1EH, 20H, 22H, 25H
DB 27H, 29H, 2BH, 2EH, 30H, 33H, 35H, 38H
DB 3AH, 3DH, 40H, 43H, 45H, 48H, 4CH, 4EH
DB 51H, 55H, 57H, 5AH, 5DH, 60H, 63H, 66H
DB 69H, 6CH, 6FH, 72H, 76H, 79H, 7CH, 80H
END

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