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矩阵键盘的实现 按下按键之后,分别显示0~9,A~F- H0 J, e7 n/ T; B$ Q
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3 B8 g$ P0 ]" ?# u按下按键之后,分别显示0~9,A~F.( x Q" G" q, S0 ^4 V
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#include<reg51.h>' ?* x% L8 i# I- H, E" `& ?
#define uchar unsigned char
! o1 D, c: [/ ^4 s: p" {#define uint unsigned int3 A& o" C8 C& ?' |9 f# c2 E1 G. _! h
. D6 J" m! S3 g2 C" Zsbit wela=P3^0;- m! d! X6 i2 c: V! q. u% v
uchar code table[]={
, ^% M2 Z/ o5 a8 o* n t0xc0,0xf9,0xa4,0xb0,
! q' ^* H; y- l/ z0x99,0x92,0x82,0xf8,% B5 s0 `# q$ A \. P8 x
0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};" c7 n" n5 C' O: K) p( x B, S
# ], Z/ ^* w" C
void delayms(uint x)
2 c& |. H- y3 A9 V! g{
% W! O# b) [; ]' d0 u6 N uint i,j;
+ A( `5 h2 r. Q$ [9 [5 R% O0 w for(i=x;i>0;i--)
) G/ U2 `" {: Z% I5 C for(j=110;j>0;j--);
$ A- v/ y8 ~, e1 U
. E8 V3 q7 C( s! x5 d4 H}
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void display(uchar num)
6 p" @5 l0 }$ R h* y# D' }* @{
/ R% A! M1 C; W3 f P1=table[num];
0 c3 F1 c9 Z! K7 _. d/ z; x5 A+ T, i wela=1;
4 b; N/ H2 \4 W( c delayms(5);0 }$ [0 h4 N! [$ L
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void matrixkeyscan()' l4 `0 i% y4 Q U/ _5 w' ~; \, @
{
' L+ |" l$ E- O5 T$ G* ]- B! d uchar temp,key;
0 a0 z7 x" ]) n @( _4 G //扫描第一行( o7 q% W7 I. X B. T5 W5 K( m6 W* }; X
P2=0xfe;) `0 ^; z# C5 a; t- f( n4 J' @
temp=P2;
9 _) I: }- K: G& t$ H temp=temp&0xf0;7 Y- u9 {/ r: M& a' D2 v) t
while(temp!=0xf0)$ k! e: a) w; F( n: ]: J
{
# \8 I/ Y; `6 ~% {) O delayms(10);//去抖动# `% g- B' I+ _- _0 T, |3 m
while(temp!=0xf0)
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temp=P2;- B* K+ M( W0 ~1 n1 \: z
switch(temp)
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case 0xee:key=0;
# c( V- Z- \. C4 x+ v% Z break;
: s( h/ u* u } case 0xde:key=1;
! ]1 S. \* t/ P1 V0 c2 p1 j break;% d; p, i$ Y* R! q; X" }: ?+ r- B r
case 0xbe:key=2;1 q% V" G$ V# j1 A3 A3 q5 J. z K% e8 c
break;
: F) [: K$ R6 |$ b$ o3 ` case 0x7e:key=3;
) R7 @; s' ~ v% z6 J& K, \& _ break;
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}
7 l% X" _) t7 W* b while(temp!=0xf0)//松手检测,即松手才显示,如果没有这句,则一按就显示。5 x) _. S$ a ^7 s$ V" e* O
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temp=P2;
0 @6 h; y4 F. i. }2 M temp=temp&0xf0;# Z# L$ P5 {' R" {4 U
}
! h6 E6 S- H6 S' N) |; M display(key);
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}
( s# V$ C! t3 A, R" o //第二行
" E( l, ^! O* O# K2 I0 Q/ N, j P2=0xfd;
4 I1 e/ i# R( f5 ]: m+ E3 F8 L+ N temp=P2;& \. |$ L" g {. N8 L/ X
temp=temp&0xf0;
1 E9 s2 w2 U( |" p. t& a. Q/ l/ b$ @; N1 p while(temp!=0xf0)
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delayms(10);, p3 v' T9 U( ?" |9 k& Q
while(temp!=0xf0)/ X! ?# v+ p; C3 W7 [( v% y
{
( @: K$ H; \6 P4 L# t o" |1 y temp=P2;# P- Z2 z& L1 m2 V
switch(temp)
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case 0xed:key=4;
* B3 {# d+ V7 K- D3 ~ break;
4 U- H+ [" _/ l+ D% E a case 0xdd:key=5;
6 T7 V$ {! j6 y& S+ Q$ U/ s break;
, o2 `, R) @# t. d case 0xbd:key=6;
7 @) P# L) ~5 J2 c& u* O" z: Q break;
' c4 m3 Y) W5 Q u2 ~5 \$ A case 0x7d:key=7;8 v& s& b+ C+ }7 g' B8 q- B
break;- v* h* f1 A5 ^. u
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. [6 x- k& K% ]* V6 L" T while(temp!=0xf0)//松手检测,即松手才显示,如果没有这句,则一按就显示。/ p4 W* z" r6 s3 q: j+ r/ Z6 A, K5 n1 I
{- p$ _% @# }9 f( E
temp=P2;
: ]$ C2 o* J+ ]" K7 g. R4 o9 ~ temp=temp&0xf0;
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display(key);
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6 M. U. ?$ s" s1 z6 b0 T6 E$ ] }, v8 t5 m. x# C6 E* g
//third% ]3 A! Q2 ]; Y: o Z
P2=0xfb;, B, B8 h8 C5 z/ I, O
temp=P2;
4 z9 L/ L! }2 `" u% n5 j* m. ` temp=temp&0xf0;! P" k3 G: N- l* \2 y7 R. n3 t6 k
while(temp!=0xf0): m# o. Z5 ]+ p* Y2 Z& d
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delayms(10);7 K, P" Y8 [4 j% e- ]) [
while(temp!=0xf0)
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temp=P2;
$ ]( `* _. z; Q+ b6 E switch(temp)& X: j2 Y4 u3 L! S
{
/ K- L; e" F& a1 o) d0 Y8 z( K& z) G* Z case 0xeb:key=8;
! e g( Q4 N3 g) S4 e; G* B; v break;$ k5 j# l% L" k$ }8 x4 ?5 x. B- ~
case 0xdb:key=9;- R9 m3 I) q# C7 v; C
break;) L! M/ i2 l" i& N$ ^- r7 x( V/ N
case 0xbb:key=10;& S, T ]: z2 G
break;; j% d5 j. q. q* L( @4 B
case 0x7b:key=11;
6 M1 ^0 m) E. I( J. h break;
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}
3 R8 [7 h' U1 d while(temp!=0xf0)//松手检测,即松手才显示,如果没有这句,则一按就显示。: n P Z4 u3 u3 U: A! w! ]3 I- {% c
{) o% d' [' Z) J/ x* R! v9 J
temp=P2;
s: A/ \: k& t) a* Q! k8 } temp=temp&0xf0;
$ G/ s0 \0 s9 e! W) |0 Q }
& h/ y0 ]7 S2 [/ l0 e display(key);# F& n1 b% B& k4 I" ]4 ?
}
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3 O) t4 l7 V( Q: k9 ]" \2 i- X5 Q }
; N9 j7 e( e5 S8 p) j //forth
( w" D/ b1 S1 } J, ^ P2=0xf7;# ?& r5 K# J0 [1 I8 ~0 a
temp=P2;
. t( Y$ d5 q# q" [& _ temp=temp&0xf0;) `/ p8 G% T6 T. U* v% c' Y" t& x
while(temp!=0xf0)
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delayms(10);& F. o% d8 } C
while(temp!=0xf0); [9 D4 e1 w3 d8 B8 _$ {
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temp=P2;
% p* l7 [4 C; _ V. a! W switch(temp). h* G* s7 P5 g8 E ]+ @# n: X' U
{7 q& x9 @" T" O0 G( d
case 0xe7:key=12;& B& h: v. a( M$ h2 K9 V
break;
, Y1 M5 ]) U) b; \+ G7 p case 0xd7:key=13;1 r6 c& _' d/ b J& n
break;) x& s& M5 Y! u M% b
case 0xb7:key=14;
$ M; z6 ]) L x$ l; P) V; W break;/ V* {, ~% z0 I
case 0x77:key=15;! G* G$ I5 ^; Q1 }8 l- L
break;* r5 e: d" N+ D: V q3 W
, C+ g: t* G8 ]& ]" [6 R; }- f% d }
6 S( T0 ]3 g! k6 T while(temp!=0xf0)//松手检测,即松手才显示,如果没有这句,则一按就显示。
% l8 T+ z$ h. w" h+ r {5 K' g, n# m) H% Q0 ]
temp=P2;
1 ?3 J% h) s1 l% l$ } temp=temp&0xf0;
% l- A) W7 [" Q- d' J6 {* C1 j }
: L3 Q. o" I3 f4 `3 J display(key);% Z5 ^3 J" i1 x( d4 ~* ~& A4 v% T
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}
. `- E; L# d5 ^2 D; qvoid main(). U1 \! d; I( b6 l
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0 z" ], O a" G* c# P# R, j2 g2 ^ while(1)4 v5 D+ d& a3 l( E3 Y: e; ]) g
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matrixkeyscan();
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