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本帖最后由 jili1986729 于 2009-10-7 13:42 编辑
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我自己用单片机做的电子琴,比较简单,用了一个功放,自己做了个矩阵键盘
4 C) Z* [% k9 k9 G" J; y单片机应该用892051,这里89c51,有点浪费
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; {; |8 X: \3 y$ U程序:9 V/ G7 B- k& c& G
ORG 00H2 P1 }+ d# ?& Q& X F9 m
AJMP START
6 K( S7 o& b% GORG 001BH
% s/ [- E2 M! h: wLJMP TIME12 _9 \0 `+ r Y3 w; ^& [
ORG 30H K# N; ]1 {/ ? @: P$ T5 n
START:MOV TMOD,#10H, ~! I# R! p; ]! Q% H: |, k8 T
MOV IE,#88H
/ q% L2 l; ~3 n# {# |KEY:SETB F0
6 O6 ~" @4 M5 {% p CLR EA
# g U0 E! n( `8 n3 h) QCLR TR1; @ A. @$ ~. Y1 U% p5 n
MOV P1,#0F0H, T' s% s" r! z
KEY1:MOV A,P1& b; q8 h1 u2 x
CPL A2 V( J2 y8 q* {- ]* ^
ANL A,#0F0H- T4 K+ E8 D3 ^) I
JZ KEY
% I1 G% t* Q) }3 w' b, y CLR F0
1 N0 g1 e1 P9 b) w. B, B7 j8 UL1: LCALL SKEY
, }9 r# N3 {+ c1 q, D CLR EA8 {) a; M# ~* m y; Y
CLR TR1# p8 N$ k: b1 o$ E
JB F0,KEY
- H& d2 d7 ^) UMOV 22H,A
1 {' M; k* ^8 \' f8 _0 k$ _ ADD A,22H
0 b% W: x; y' h2 \. ^9 [) m& x MOV R3,A
' I: _1 [+ h1 Y! z. u MOV DPTR,#TABLE1& U' q% v7 l2 d8 d! q' N: s9 ~+ E
MOVC A,@A+DPTR! n, N7 h( U/ \' _) R0 _
MOV TH1,A$ Y. o* o* x S! ]
MOV 21H,A; M& H$ }6 _5 E
MOV A,R3" v3 U3 `! t; g8 c
INC A
( s% p0 |( B/ A# _; h) t( g& }% N/ ]0 x MOVC A,@A+DPTR
8 q( G! ?: g. _8 ]. o7 c MOV TL1,A
- u5 O- v6 j% t8 f MOV 20H,A5 _& E6 X" u) C* q1 l f/ ^- b: H
SETB EA
( o H7 |' e* y, D SETB TR1
+ j9 u' j, }, l4 q4 \L2:CALL SKEY
( o" ^( t P$ b2 J* Q. j SETB EA
( a$ Q& w9 P/ F Q SETB TR1. C/ Q# U' d7 q; C
JB F0,KEY' r% I5 L" j& e
LJMP L2
1 N+ x% A) f8 W( O: S+ P5 y; VSKEY:MOV A,#00( r2 ^$ L6 a! d8 E0 d' ?
MOV R0,A
. U1 q+ J4 N+ Y) | MOV R1,A4 \0 D! s1 W5 W; M: ]6 x
MOV R3,#0FEH
8 X$ I( n0 S0 n4 Y6 ~; xSKEY2:MOV A,R33 J+ P' M. o3 g3 t/ P/ d2 a: c% Y
MOV P1,A/ L( m2 L& E! T7 M, m( k! J+ U5 X
NOP
' s& Q7 Z i, ^5 `" H NOP
# j2 Z4 v y) B$ a5 M9 C4 _ NOP
, w; {* m5 e. m ` MOV A,P15 s1 }4 e- o5 q, A
MOV R1,A
: k" F- _8 [/ u CPL A
; b# ]3 @4 I- [3 ^" _) P) S ANL A,#0F0H
+ I# w" e9 @2 H" s9 k2 b% vS123:JNZ SKEY3
- V% n% F! P3 `- H SETB F0. H6 c' \; ?1 q. h
INC R0
3 e- d5 R8 V& ~ SETB C c8 c& _9 ^1 |2 H, s0 x: V* L* ]
MOV A,R3* g0 F& x8 O4 i6 T3 Z n( H
RLC A
7 m) l/ A; K: p8 ~+ h MOV R3,A# \4 i" t( _' c" N
MOV A,R09 p* X( e, y5 M Z
CJNE A,#04H,SKEY24 x5 M4 K* T0 c; m
EKEY:RET
+ i( }6 ^5 N9 @; I8 `SKEY3:CLR F0
1 C& j6 t2 Z7 M6 A( W MOV A,R1
; l$ N6 Q/ } v3 ?8 I# T. G: s JNB ACC.4,SKEY51 G+ N, d) X/ ]+ a( a
JNB ACC.5,SKEY67 P$ Q( {$ T- ^& z2 l
JNB ACC.6,SKEY78 }# t4 }. K$ F- @- I# h. A
JNB ACC.7,SKEY8
: P6 A; ]" M9 S9 y+ G9 C1 v% _/ h AJMP EKEY
) ~1 X* I% B3 R6 o7 H3 E" jSKEY5:MOV A,#00H5 D4 h: P, B0 D, K
MOV R2,A
5 O/ I4 o5 _3 r8 ? t0 F3 b AJMP DKEY4 l5 H! i7 c: p
SKEY6:MOV A,#01H
' B+ @: D* i3 w) J: S z MOV R2,A# |) I% ^1 M' l1 ]0 ? ]
AJMP DKEY
2 j5 M4 F& @- Q, V% p9 _SKEY7:MOV A,#02H
- W$ p, D3 m' \( | MOV R2,A* S$ s+ F3 u( b* ?- z& E I! M
AJMP DKEY: W8 E |% I1 Z1 s& R! l+ b
SKEY8:MOV A,#03H! I; L! L- h( E2 s! b- I
MOV R2,A
% }4 x$ d; C" y+ B5 i+ T AJMP DKEY
9 C$ \& N, D; o# G( I/ ~DKEY:MOV A,R0
+ @% x! S+ x& v7 Y ACALL DECODE% ~- L6 m+ q+ ~
AJMP EKEY+ l/ C; m% L; _5 x$ h! q$ C5 S
DECODE:MOV A,R0
0 i0 m7 k) E( H! X MOV B,#04H; l1 I( z/ O4 V% T j
MUL AB& Y4 _8 F4 U6 P, _
ADD A,R2
- U/ ]9 @4 r, ~+ t RET) N) I ?9 }. L
TIME1: PUSH ACC
" K& I$ t. } d% ] PUSH PSW8 E& | U- @5 X
CPL P2.4
" m* x9 _4 o" }+ h2 I* Y8 ? MOV TL1,20H
' N8 r* P2 V: O: P* W MOV TH1,21H M0 h/ [- j1 o7 s
POP PSW( T2 e! h, X" K$ H9 D0 M. a" l
POP ACC- h7 a" ^. j: k
RETI0 [* }, N, k2 O" E/ ?
TABLE1: DW 64021,64103,64260,64400,64524,64580,64684,64777
3 I) E Q+ c; y' O6 M: p DW 64820,64898,64968,65030,65058,65110,65157,65178! d0 F* ^5 F7 t; ?* Z7 m
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