一个用51单片机播放歌曲的小程序
单片机汇编语言源程序如下:
- org 0000H
- sjmp start
- org 0040H
- start: mov R3,#-1;
-
- loop4:
- jb p1.0,stopzero ; the first step: see if button1 on. it is 0 jump to stopzero (2us)
- inc R3 ;R3=0 at first (1us)
- sjmp mod1;butoon=1 jump to paly the song (2us)
- stopzero: ;(5us)
- jb p1.1,stopone ;see if button2 is on. it's 0 jump to stoptone(2us)
- inc R3 ; R3=0 at first (1us)
- sjmp mod1 ; jump to paly the song (2us)
- stopone:; (5us)
- jb p1.3,loop4 ;see if button3 is on. it's 0 jump to stoptwo(2us)
- inc R3
- sjmp mod1 ; jump to paly the song (2us)
-
-
- mod1: mov a,R3 ;(1us)
- chec1: jb p1.0,chec2 ;(2us)find which song we are playing (2us)
- sjmp b1 ;(2us)
- chec2: jb p1.1,chec3
- sjmp b2
- chec3: jb p1.3,chec1
- sjmp b3
- b1: mov b,#11 ;(1us) b=first song's notes number
- sjmp di ;(2us)
- b2: mov b,#30 ;b=second song's notes number
- sjmp di
- b3: mov b,#30 ;b= third song's notes number
- sjmp di
- di: div ab ;divide a by b ,remainder is in b (4us)
- mov a,b ; put remainder in a (1us)
- mov R3,b ;put remainder in R3(which will be divided later (1us)
-
-
- check1: jb p1.0,check2 ;to find which song is playing and get the duration table (
- sjmp songdu1
- check2: jb p1.1,check3
- sjmp songdu2
- check3: jb p1.3,check1
- sjmp songdu3
- songdu1: mov dptr,#durationone ;get duration table (2us)
- sjmp get
- songdu2: mov dptr,#durationtwo ;get duration table
- sjmp get
- songdu3: mov dptr,#durationthree ;get duration table
- sjmp get
-
- get: movc a,@a+dptr ;get the data in duration table one by one(2us)
- mov R2,a; put a in R2 (1us)
-
- ;loop3（24+3+notes's half period)
- loop3: mov a,b ;give reminder to a agian to get notes table(1us)
- che1: jb p1.0,che2
- sjmp songno1
- che2: jb p1.1,che3
- sjmp songno2
- che3: jb p1.3,che1
- sjmp songno3
- songno1: mov dptr,#notesone ;get duration table (2us)
- sjmp getn
- songno2: mov dptr,#notestwo ;get duration table
- sjmp getn
- songno3: mov dptr,#notesthree ;get duration table
- sjmp getn
-
-
- getn: movc a,@a+dptr ; (2us)
- mov R1,a ;put note now in R1 (1us)
- loop2:mov R0,#10 ;the part of play every note:(2*R0+2+1)*R1
- loop1: djnz R0,$
- djnz R1,loop2
- cpl p3.1
- djnz R2, loop3 ;start make delay (2us) R2*(loop3+2us)
-
- mov R1,255 ;make rest between two notes (1us)
-
- delay2:mov R0,#255
- delay1:djnz R0,$
- djnz R1,delay2
- acall loop4 ; get all steps again and agian
- sjmp $
- notesone: db 66,83,105,83,74,56,74,66,74,105,83 ; the delay time of the music score one by one
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
所有资料51hei提供下载:
lab2-8051.rar
(65.72 KB, 下载次数: 40)
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