m62429的音量控制程序.txt

来自「M62429的音量控制程序,用asm编写」· 文本 代码 · 共 46 行

M62429的音量控制程序,资料 http://www.dzkjcn.com/Soft/dates/200412/3.html      

                   MOV   A,18H     ;************音量调节
                   CLR   P1.6
                   MOV   DPTR,#voltab
                   SETB  C
                   MOV   P1.7,C
                   SETB  P1.6
                   LCALL voldelay
                   CLR   P1.7
                   CLR   P1.6
                   MOV   R3,#08H
                   MOVC  A,@A+DPTR
vol1:              RLC   A
                   MOV   P1.7,C
                   SETB  P1.6
                   LCALL voldelay
                   CLR   P1.7
                   CLR   P1.6
                   LCALL voldelay
                   DJNZ  R3,vol1
                   SETB  C
                   LCALL voldelay
                   MOV   P1.7,C
                   SETB  P1.6
                   LCALL voldelay
                   CLR   P1.7
                   CLR   P1.6
                   LCALL voldelay
                   MOV   P1.7,C
                   SETB  P1.6
                   LCALL voldelay
                   LCALL voldelay
                   CLR   P1.6
                   LCALL voldelay
                   CLR   P1.7
                   SETB  P1.6
                   RET

;========音量编码============================
voltab: db  00H,61h,30H,09H,68H           ;off,-73dB,-63dB,-53dB,-43dB
        db  18H,58h,38h,78h,04h               ;,-39dB,-35dB,-31dB,-27dB,-23dB    
        DB 44H,45H,24H,25H,64H,65H,14H,15H    ;-19dB,-17dB,-15dB,-13dB,-11dB,
                                                                       ;-9db,-7dB,-5dB
  DB 54H,55H,57H      ;-3dB,-1dB,0dB