Very detailed single chip traffic light control program

Use the timer to count time, the annotations are very detailed, and you can change the timing time yourself.

The microcontroller source program is as follows:

#include "reg52.h"

#define GPIO_TRAFFIC P2

#define GPIO_DIG P0

typedef unsigned char u8;

typedef unsigned int u16;

//3-8 decoder pin definition

sbit LSA = P1^0;

sbit LSB = P1^1;

sbit LSC = P1^2;

//Definition of the north-south direction control pins of the traffic light

sbit GREEN10 = P2^0;

sbit RED10 = P2^1;

sbit GREEN11 = P2^2;

sbit YELLOW11 = P2^3;

sbit RED11 = P2^4;

// Traffic light east-west direction control pin definition

sbit GREEN00 = P1^6;

sbit RED00 = P1^7;

sbit GREEN01 = P2^5;

sbit YELLOW01 = P2^6;

sbit RED01 = P2^7;

u8 code smgduan[16] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,

                                                0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; //Common cathode

u8 displaydata[8]; //Store the countdown of the signal light

//Define a global variable

u8 second;

//Declaration of various functions

void Timer0Init();

void delay(u16 i);

void Digdisplay();

void trafficpros();

/*******************************

                Main function: main

*******************************/

void main(void)

{

        second = 1;

        Timer0Init(); //Initialize timer T0;

        while(1)

        {

                 trafficpros();       

        }

}

/*******************************

Timer T0 configuration function, only select TR in TCON

0 trigger, timing 10ms.

*******************************/

void Timer0Init()

{

        TMOD |= 0x01;

        TH0 = 0xd8;

        TL0 = 0xf0; //Set the initial value to 55536 and the timing to 10ms

        IE = 0x82; // Enable T0 interrupt and total interrupt

        TR0 = 1; //Start timer T0

}

/*******************************

Interrupt handling function

*******************************/

void Time0() interrupt 1

{

        static u16 i;

        TH0 = 0xd8;

        TL0 = 0xf0; //Reload initial value

        i++; //Record the number of interruptions, 100 times per second

        if(100 == i)

        {

                 i = 0;

                second++;

        }       

}

/*******************************

Delay function, delay about 10μs

*******************************/

void delay(u16 i)

{

        while(i--);

}

/*******************************

8-bit digital tube bit selection function

*******************************/

void DigDisplay()

{

        u8 i;

        for(i = 0; i < 8; i++)

        {

                   switch(i)

                {

                        case 0:

                                LSA = 0; LSB = 0; LSC = 0; break;

                         case 1:

                                LSA = 1; LSB = 0; LSC = 0; break;

                        case 2:

                                LSA = 0; LSB = 1; LSC = 0; break;

                        case 3:

                                LSA = 1; LSB = 1; LSC = 0; break;

                        case 4:

                                LSA = 0; LSB = 0; LSC = 1; break;

                        case 5:

                                LSA = 1; LSB = 0; LSC = 1; break;

                        case 6:

                                LSA = 0; LSB = 1; LSC = 1; break;

                        case 7:

                                LSA = 1; LSB = 1; LSC = 1; break;

                }

                GPIO_DIG = displaydata[i];

                delay(100);

                GPIO_DIG = 0x00; //disappear

        }

}

/*******************************

Traffic light control function

*******************************/

void trafficpros()

{

        if(second > 74)

        {

                 second = 1;

        }

        //North-South traffic and pedestrian paths

        if(second < 32)

        {

                displaydata[0] = 0x00; //The first digit is not displayed

                displaydata[1] = 0x00; //The second digital tube does not display       

                displaydata[2] = smgduan[(31 - second)/10];

                displaydata[3] = smgduan[(31 - second)%10];

                displaydata[4] = 0x00; //The fifth digit is not displayed

                displaydata[5] = 0x00; //The sixth digit is not displayed

                displaydata[6] = displaydata[2];

                displaydata[7] = displaydata[3];

                Digdisplay();

                // Each time all the lights are turned off

                GPIO_TRAFFIC = 0xff;

                GREEN00 = 1;

                RED00 = 1;

                GREEN10 = 0; //The pedestrian crossing light is green

                GREEN11 = 0; //The lane green light is on

                RED00 = 0; //The red light on the east-west sidewalk is on

                RED01 = 0; //The red light on the east-west lane is on

        }

        //Intermediate yellow light stage

        else if(second < 38)

        {

                 displaydata[0] = 0x00; //The first digit is not displayed

                displaydata[1] = 0x00; //The second digital tube does not display       

                displaydata[2] = smgduan[(37 - second)/10];

                displaydata[3] = smgduan[(37 - second)%10];

                displaydata[4] = 0x00; //The fifth digit is not displayed

                displaydata[5] = 0x00; //The sixth digit is not displayed

                displaydata[6] = displaydata[2];

                displaydata[7] = displaydata[3];

                Digdisplay();

                // Each time all the lights are turned off

                GPIO_TRAFFIC = 0xff;

                GREEN00 = 1;

                RED00 = 1;

                RED10 = 0; //The red light on the north-south pedestrian crossing is on

                YELLOW11 = 0; //The yellow light on the north-south lane is on

                RED00 = 0; //The red light on the east-west sidewalk is on

                RED01 = 0; //The red light on the east-west lane is on               

        }

        //East-west traffic and pedestrian paths

        else if(second < 69)

        {

                 displaydata[0] = 0x00; //The first digit is not displayed

                displaydata[1] = 0x00; //The second digital tube does not display       

                displaydata[2] = smgduan[(68 - second)/10];

                displaydata[3] = smgduan[(68 - second)%10];

                displaydata[4] = 0x00; //The fifth digit is not displayed

                displaydata[5] = 0x00; //The sixth digit is not displayed

                displaydata[6] = displaydata[2];

                displaydata[7] = displaydata[3];

                Digdisplay();

                // Each time all the lights are turned off

                GPIO_TRAFFIC = 0xff;

                GREEN00 = 1;

                RED00 = 1;

                GREEN00 = 0; //The green light on the east-west sidewalk is on

                GREEN01 = 0; //The green light on the east-west lane is on

                RED10 = 0; //The red light on the north-south pedestrian crossing is on

                RED11 = 0; //The red light on the north-south lane is on

        }

        //Intermediate yellow light stage

        else

        {

                 displaydata[0] = 0x00; //The first digit is not displayed

                displaydata[1] = 0x00; //The second digital tube does not display       

                displaydata[2] = smgduan[(74 - second)/10];

                displaydata[3] = smgduan[(74 - second)%10];

                displaydata[4] = 0x00; //The fifth digit is not displayed

                displaydata[5] = 0x00; //The sixth digit is not displayed

                displaydata[6] = displaydata[2];

                displaydata[7] = displaydata[3];

                Digdisplay();

                // Each time all the lights are turned off

                GPIO_TRAFFIC = 0xff;

                GREEN00 = 1;

                RED00 = 1;

                RED00 = 0; //The red light on the east-west sidewalk is on

                YELLOW01 = 0; //The yellow light on the east-west lane is on

                RED10 = 0; //The red light on the north-south pedestrian crossing is on

                RED11 = 0; //The red light on the north-south lane is on       

        }

}