5-LED模拟交通灯单片机C语言程序设计实训100例

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( U' E8 l5 v; s* ^#include<reg51.h>
#define uchar unsigned char
$ I. F: H; t( |7 a#define uint unsigned int
5 D% n" `' R4 `. V5 v+ s7 \sbit RED_A=P0^0; //东西向灯
. C* e  Q* s0 I2 u3 Y) Tsbit YELLOW_A=P0^1;
% `" Z1 o, n1 ~9 lsbit GREEN_A=P0^2;
* i- T2 I( R8 ?/ e$ W2 x7 Nsbit RED_B=P0^3; //南北向灯
sbit YELLOW_B=P0^4;
sbit GREEN_B=P0^5;
! s7 k  r/ T3 ?) V1 Xuchar Flash_Count=0,Operation_Type=1; //闪烁次数，操作类型变量  

% u# ^4 Z! T6 W//延时
void DelayMS(uint x)
{
0 v! d9 l6 T4 E% S  l( ]* _; |uchar i;
: @# F( r- D, k2 c7 o7 [: O/ Z& N& kwhile(x--) for(i=0;i<120;i++);
5 X* {1 D" W9 a1 j}
//交通灯切换
+ g, ~8 \  e. f  P- G4 vvoid Traffic_Light()
: `+ i  }+ c3 M  P{
4 x" [5 [! |+ _. wswitch(Operation_Type)
{
  ^1 Q! V' ?( Z* B( I! Q7 Ycase 1: //东西向绿灯与南北向红灯亮
" l7 ]3 @5 H# aRED_A=1;YELLOW_A=1;GREEN_A=0;
& t8 J* ]: _/ z. k0 ?" O, V  T. n0 TRED_B=0;YELLOW_B=1;GREEN_B=1;
6 f& x* n3 k1 x$ ^/ RDelayMS(2000);
# K! r0 b' A. c3 V) |  D. K" UOperation_Type=2;
break;
case 2: //东西向黄灯闪烁，绿灯关闭
. X/ Y# M/ O9 h9 FDelayMS(300);
' k+ K* K% i3 l, h6 ?0 Z% G/ g5 [. |YELLOW_A=~YELLOW_A;GREEN_A=1;
( ]9 U! q8 j& Gif(++Flash_Count!=10) return; //闪烁 5 次
3 T/ ^% `2 k; V1 r( z9 Z: j7 UFlash_Count=0;
( T9 C" ?( K, X$ W: [, E! Z% bOperation_Type=3;
8 a5 Q' s2 v2 G. ]1 F0 vbreak;
* u& I4 Y: o2 icase 3: //东西向红灯，南北向绿灯亮
RED_A=0;YELLOW_A=1;GREEN_A=1;
" P/ _, M9 W- C! F5 j% G5 @9 d) f. E' pRED_B=1;YELLOW_B=1;GREEN_B=0;
DelayMS(2000);
Operation_Type=4;
; }+ ~% z) Z+ Bbreak;
case 4: //南北向黄灯闪烁 5 次
: A4 W: P" O6 ^8 _6 ^DelayMS(300);
YELLOW_B=~YELLOW_B;GREEN_B=1;
. B7 D0 M# w% l: `6 M$ Cif(++Flash_Count!=10) return;
Flash_Count=0;
. _  @) \% a* O$ EOperation_Type=1;
( ~6 a7 v- {. K) K' t; K3 Y6 G}
}
//主程序
void main()
{
6 j. [2 n# L6 {1 y& T9 r4 W& Gwhile(1) Traffic_Light();
}  
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