51 MCU Learning Notes——4. Two buttons control the LED light

Two buttons to control the LED program:

/*

 * @Author: Wang Yunlong

 * @Date:   2020-02-23 12:48:51

 * @Last Modified by: Wang Yunlong

 * @Last Modified time: 2020-02-23 15:37:24

 */

#include

#define LED P0; //Set LED pin

sbit KEY1 = P3^4; //Set key 1 pin

sbit KEY2 = P3^5; //Set key 2 pin

void LightLed1(); //Lighting mode 1

void LightLed2(); //Lighting mode 2

void delay(unsigned int n); //n ranges from 0 to 65535

unsigned char table1[15] = {0x7E,0xBD,0xE7,0x00,0xFF,0xDB,0xBD,0x7E,0x00,0xFF,0x00,0xFF};

unsigned char table2[] = {0xFE,0xFD,0xE7,0xEF,0xDF,0xBF,0x7E,0xFF,0x00,0xFF,0x7F,0xBF,0xDF,0xDF,,0xEF,0xF7,0xFB,0xFD,0xFE,0xFF,0x01};

void main()//two buttons

{

    while(1)

    {

        if(KEY1==0) //key 1, press detection

        {

            delay(5); //delay 5ms

            if(KEY1==0)

            {

                LightLed1();

            }

            while(!KEY1)//Release detection

        }

        if(KEY2==0) //Key 2

        {

            delay(5);

            if(KEY==0)

            {

                LightLed2();

            }

            while(!KEY2);

        }

    }

}

void delay(unsigned int n) //n ranges from 0 to 65535

{

    unsigned char i;

    unsigned int j;

    for(i = 0;i<183;i++)

    {

        for(j = 0;j        {

            ;

        }

    }

}

void LightLed1()//Lighting method without identifier, for() loop

{

    unsigned char i;

    for(i = 0;i<15;i++)

    {

        LED = table1[i];

        delay(1000);   

    }

}

void LightLed2()//Lighting method with identifier, while() loop

{

    unsigned char i = 0;

    while(table2[i]!=0x01)

    {

        LED = table2[i];

        delay(1000);

        i++;

    }

}

Method 1 and method 2 are two different ideas:

Method 1: for() loop: stop by the number of elements in the array

Method 2: while() loop, stopped by identifier in array