本帖最后由 乡村猎手 于 2018-10-10 22:20 编辑 / `+ C; ?! {% s+ n; z" x
$ r: C0 e: m3 J" z输入和输出的逻辑弄清楚了,写代码就是分分钟的事了。下面是这些功能的C源码。实现的功能就是快进、进退、停止、播放、录音的功能。代码当然有很多种写法,status变量暂时还没用到,可以用在进入某个一功能时判断用,如果机器已经是某个状态再按哪个按钮以不用响应,不过实际试的时候不判断好象也没什么问题。是不是其实很简单呢?
9 _. \, L& @+ A j5 ]#include <reg51.h>
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1 {( t+ E0 d; R$ Csbit key1 = P0^7;8 w6 I2 Q2 k0 Z& y \- q
8 X! C% \+ K K7 ~" b2 q$ g9 H( F3 vchar status=0; //1:play 0:stop 2:forw 3:rew 4:rec 9:off
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char recflag = 0 ;
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void Play(void)4 v; Z) d- y7 j1 p% k: K
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P1=0X48;
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P3=0X01;
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% I8 u$ f( e& [3 }, v+ pvoid Rec(void)! I4 m1 F% v- R0 ?+ T
{
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P3=0X01; I/ t$ F- U* @" Y" H
status=1;" i* R8 s6 B1 D8 C# O! q/ T( ^
}
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void Stop(void)
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P3=0X48;; l& t# q2 R9 T0 `0 p
status=0; & j) Y6 d" ^' K) G5 \2 l
}
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" W# W' I* e% i1 J# |* _void Forw(void)0 o7 s' |* e( p& ]# b: o
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P1=0X7C;
: f5 d1 ^2 v- _+ T* O3 j- v P2=0XF3;
$ C& B9 N) G* I1 z P3=0X20;
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' Z4 D1 f# _$ ?0 g5 r+ R4 l8 O/ s+ avoid Rew(void)
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P1=0X0C;& r7 {- N" z# g) F- z
P2=0XF3;
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status=0; ; {" D3 N1 X0 d* g+ C0 W& n9 t
}
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, o% w$ c* G* hvoid main(void)
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' F9 W$ ?) ]2 \+ p& E. ] unsigned char i;
% k( A2 J8 u/ j" w- w unsigned int k;
& h% W! w' D M( f// unsigned char j;
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Stop();
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while(1)
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, m1 }2 {; v2 g P0= i<<4 ;
$ e; T# l- Z" d6 y+ D1 }/ l/ X for (k=0;k<1000;k++) & W8 c2 A. j6 T3 r$ O3 Q2 S7 W* P
{
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key1=1;5 Q. L4 n% N- b1 w
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/ r, z" t0 l& ?; A, N if (i==0&&key1==0)//play
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if (i==1&&key1==0) //stop! X [) _9 y! E8 w8 O
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Stop();, U- b# F( [! ]3 ^5 m9 w! H
}
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" i6 \5 ^ {: [' M$ q4 R if (i==2&&key1==0)//play
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if (recflag==1), f! Z* x/ R7 c" e
{
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}
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7 e2 E% ]8 |0 Q. V8 e3 K( g Play();1 R- T7 `2 m+ F: _) D; ?
}
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if (i==3&&key1==0)//Forw
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Forw();
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Rew();
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}
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