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#include <reg52.h> //调用单片机头文件
#define uchar unsigned char //宏定义"uchar"代替"unsigned char"。
#define uint unsigned int //宏定义"uint"用来定义无符号整型数。
//数码管段选定义共阳极 给0点亮 ，给1熄灭
uchar code smg_du[17] = {
0xc0, //0 1100 0000
0xf9, //1
0xa4, //2
0xb0, //3
0x99, //4
0x92, //5
0x82, //6
0xf8, //7
0x80, //8
0x90, //9
0x88, //A
0x83, //b
0xc6, //C
0xa1, //d
0x86, //E
0x8e //F
};
uchar dis_smg[4 ] = {0xc0,0xf5,0x8c,0x94};
//数码管位选定义
sbit smg_we1 = P2^0; //东西数码管2
sbit smg_we2 = P2^1; //东西数码管1
sbit smg_we3 = P2^3; //南北数码管2
sbit smg_we4 = P2^2; //南北数码管1
//红绿灯位选定义
sbit nb_red = P1^0; //南北红灯
sbit nb_green = P1^2; //南北绿灯
sbit nb_yellow = P1^1; //南北黄灯
sbit dx_red = P1^3; //东西红灯
sbit dx_green = P1^5; //东西绿灯
sbit dx_yellow = P1^4; //东西黄灯
bit flag = 1; //进入南北方向切换的标志位
bit flag_dx_nb; //东西南北模式标志位
bit flag_500ms;
uchar time1;
uchar nb_time = 30,dx_time = 20; //东西、南北的时间
uchar jdgz ; //交通管制
uchar djs= 0; //东西 南北 倒计时变量
//交换一个字节的位置用于数码管显示
#define LED_a 6 //数码管段选的a段接在段选IO口的第0位
#define LED_b 5
#define LED_c 0
#define LED_d 2
#define LED_e 1
#define LED_f 4
#define LED_g 3
#define LED_dp 7
uchar ChangeFor( uchar dat)
{
uchar temp=0;
if(dat&0x01) //判断数据的第一位是否为1
temp|=0x01<<LED_a; //如果为1,放到控制数码管a段的位置 ( &按位与,1&1=1 ,1&0=0 )
if(dat&0x02)
temp|=0x01<<LED_b;
if(dat&0x04)
temp|=0x01<<LED_c;
if(dat&0x08)
temp|=0x01<<LED_d;
if(dat&0x10)
temp|=0x01<<LED_e;
if(dat&0x20)
temp|=0x01<<LED_f;
if(dat&0x40)
temp|=0x01<<LED_g;
if(dat&0x80)
temp|=0x01<<LED_dp;
return temp;
}
//数码位选函数 ，选择哪一个数码管亮
//i: 0,东西数码管2
// 1,东西数码管1
// 2,南北数码管1
// 3,南北数码管2
void smg_we_switch(uchar i)
{
switch(i)
{
case 0: smg_we1 = 0; smg_we2 = 1; smg_we3 = 1; smg_we4 = 1; break;
case 1: smg_we1 = 1; smg_we2 = 0; smg_we3 = 1; smg_we4 = 1; break;
case 2: smg_we1 = 1; smg_we2 = 1; smg_we3 = 0; smg_we4 = 1; break;
case 3: smg_we1 = 1; smg_we2 = 1; smg_we3 = 1; smg_we4 = 0; break;
}
}
//延时函数1ms
void delay_1ms(uint q)
{
uint i,j;
for(i=0;i<q;i++)
for(j=0;j<110;j++);
}
//数码管显示
void DisplayScan()
{
uchar i;
{
{
P0 = 0xff; //消隐 ，避免出现乱码
smg_we_switch(i); //位选 选择哪一个数码管亮
P0 =ChangeFor(dis_smg); //段选 选择哪一段数码管亮
delay_1ms(3); //延时3ms
}
i++;
if(i>3)
i=0;
}
}
//定时器0初始化
void time0_init()
{
TMOD = 0x01; //设置定时器0为工作模式1 (16-bit)
TL0 = (65536-50000)%256; //给定时器低位赋初始值 65536-15536=50000us=50ms
TH0 = (65536-50000)/256; //给定时器高位赋初始值
TR0 = 1; //开启定时器0
ET0 = 1; //允许定时器0中断
EA = 1; //开启全局中断
}
//交通灯处理函数
void jiaotongdeng()
{
if(flag == 1) //如果标志位为1
{
flag = 0; //清零标志位
if( djs == 0) //倒计时变量
{
if(flag_dx_nb == 1)
djs = nb_time; //南北时间
else
djs= dx_time; //东西时间
flag_dx_nb = ~flag_dx_nb; //切换南北时间
}
djs--;
}
if(flag_dx_nb == 0) //南北显示
{
if( djs > 3)
{
dis_smg[2] = smg_du[(djs-3)%10] ; //南北数码管2亮
dis_smg[3] = smg_du[(djs-3)/10] ; //南北数码管1亮
dis_smg[0] = smg_du[djs%10] ; //东西数码管2亮
dis_smg[1] = smg_du[djs/10] ; //东西数码管1亮
dx_red = 0; //亮
dx_yellow = 1; //灭
nb_green = 0; //亮
nb_yellow = 1; //灭
dx_green = 1; //灭
nb_red = 1; //灭
time1 = 0 ;
}else if(djs<= 3) //当小于3秒时 黄灯要闪了
{
dis_smg[0] = smg_du[djs%10] ;
dis_smg[1] = smg_du[djs/10] ;
dis_smg[2] = smg_du[djs%10] ;
dis_smg[3] = smg_du[djs/10] ;
dx_red = 0; //灭
dx_green = 1; //灭
nb_green = 1; //亮
nb_red = 1; //灭
dx_yellow = 1; //亮
if(flag_500ms==0)
{
nb_yellow = 0; //灭
}
else
{
nb_yellow = 1; //灭
}
}
}
if(flag_dx_nb ==1) //东西显示
{
if( djs > 3)
{
dis_smg[0] = smg_du[(djs-3)%10] ; // 东西数码管2亮
dis_smg[1] = smg_du[(djs-3)/10] ; // 东西数码管1亮
dis_smg[2] = smg_du[djs%10] ; // 南北数码管2亮
dis_smg[3] = smg_du[djs/10] ; // 南北数码管1亮
dx_red = 1; //灭
nb_green = 1; //灭
nb_yellow = 1; //灭
dx_green = 0; //亮
dx_yellow = 1; //灭
nb_red = 0; //亮
time1 = 0 ;
}else if( djs <= 3) //当小于3秒时 黄灯要闪了
{
dis_smg[0] = smg_du[djs%10] ;
dis_smg[1] = smg_du[djs/10] ;
dis_smg[2] = smg_du[djs%10] ;
dis_smg[3] = smg_du[djs/10] ;
dx_red = 1; //灭
dx_green = 1; //亮
nb_red = 0; //灭
nb_green = 1; //灭
nb_yellow = 1; //亮
if(flag_500ms==0)
{
dx_yellow = 0; //灭
}
else
{
dx_yellow = 1; //灭
}
}
}
}
//按键位定义
sbit Key1=P1^6; //定时70s
sbit Key2=P1^7; //定时60s
sbit Key3=P3^2; //定时50s
sbit Key4=P3^3; //交通管制键
// 该函数带松手检测,按下键返回一次键值后返回0,直至第二次按键按下
uchar Key_Scan()
{
static uchar key_up=1; //按键按松开标志
if(key_up&&(Key1==0||Key2==0||Key3==0||Key4==0))
{
delay_1ms(10); //去抖动
key_up=0;
if(Key1==0) return 1;
else if(Key2==0) return 2;
else if(Key3==0) return 3;
else if(Key4==0) return 4;
}
else if(Key1==1&&Key2==1&&Key3==1&&Key4==1)
key_up=1;
return 0; // 无按键按下
}
uchar key_can; //按键值
void key_with() //设置函数
{
if(key_can == 1)
djs= 70;
if(key_can == 2)
djs= 60;
if(key_can ==3)
djs= 50;
if(key_can == 4) //交通管制按键,紧急车辆通行
{
jdgz ++;
if(jdgz > 4)
jdgz = 0;
if(jdgz == 1) //全部亮红灯,紧急车辆通行
{
dx_red = 0; //亮
nb_red = 0; //亮
dx_green = 1; //灭
dx_yellow = 1; //灭
nb_green = 1; //灭
nb_yellow = 1; //灭
}
if(jdgz == 2) //全部亮黄灯 ,夜间模式
{
dx_red = 1; //灭
nb_red = 1; //灭
dx_green = 1; //灭
dx_yellow = 0; //亮
nb_green = 1; //灭
nb_yellow = 0; //亮
}if(jdgz == 3) // 南北绿灯,东西红灯 （南北优先通行）
{
dx_red = 0; //亮
nb_red = 1; //灭
dx_green = 1; //灭
dx_yellow = 1; //灭
nb_green = 0; //亮
nb_yellow = 1; //灭
}if(jdgz == 4) // 东西绿灯,南北红灯（东西优先通行）
{
dx_red = 1; //灭
nb_red = 0; //亮
dx_green = 0; //亮
dx_yellow = 1; //灭
nb_green = 1; //灭
nb_yellow = 1; //灭
}
}
}
//主函数
void main()
{
time0_init(); // 初始化
djs=nb_time;
while(1)
{
key_can=Key_Scan(); // 按键返回值
if(key_can )
key_with(); //按键设置函数
if(jdgz == 0) //无紧急按键按下，执行交通灯处理
jiaotongdeng(); //交通灯处理
DisplayScan(); //数码管显示
}
}
//定时器0中断服务程序
void time0_int() interrupt 1
{
uchar time; //定时中断次数
TL0 = (65536-50000)%256; //给定时器低位重装初始值 50ms
TH0 = (65536-50000)/256; //给定时器高位重装初始值
time ++;
time1++;
if(time1 % 10 == 0)
flag_500ms = ~flag_500ms; //500ms变换一次
if(time == 20) // 20x50=1000ms=1s
{
time = 0;
flag = 1;
}
}
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