C51 MCU LED Example Program Set

1、

The program implements the function: Let 8 LEDs light up in a row 1—》...——》8 1《——...《——8 The arrows represent the direction of the LED flow, first from 1-8 and then from 8 to 1. The program has been tested and runs normally // If you use this code to test, pay attention to which port your LED is connected to the microcontroller. This code uses port P2

#include

#define uint unsigned int

#define uchar unsigned char

fly a,b;

uchar code led_array[]={

0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f

}; //LED display code array, from 0xfe to 0x7f, from the first LED tube to the eighth LED tube, one at a time, the format is 0fff ffff\f0ff ffff\ff0f ffff...ffff fff0\ LED starts to light up from 1, and when it reaches the eighth LED, it starts to light up in the reverse direction ffff fff0\ffff ff0f\ffff f0ff...0fff ffff (Note: 0 represents light; 1 represents no light) I don't know if you understand what I mean....

void delay(uint x)

{

uint z,y;

for(z=x;z>0;z--)

for(y=110;y>0;y--);

}//Delay function

void sumup_ini()

{

P2=0xfe;//

}//Total initialization function, I like to write programs in modular form, but this module is too small... cough cough cough!!!

void main()

{

sumup_ini(); //Call the total initialization function

while(1) This goes without saying!

{

for(a=0;a<8;a++)

    {

P2=led_array[a];

if(P2!=led_array[7]) //Here we use if to determine whether the last LED is on. If it is the last one, the delay function will not be executed. Otherwise, the following delay function will be executed every time the LED moves one position.

/*(Here is the explanation of why we need to judge whether the last LED is lit. If the delay is executed after the last LED is lit, it will be the same as the initial value of the reverse flow function. led_array[7] is the first LED that is lit in the reverse flow and the last LED that is lit in the reverse flow. So if we don’t use if to judge, it is equivalent to delaying the time of other LEDs in led_array[7] by 2 times... In order to make the time of each LED being lit equal, I use if to judge the following)*/

delay(500);

    } //LED forward flow lights up

for(b=7;b>0;b--)

                    {

                        P2=led_array[b];

                        delay(500);

                    } //LED direction flow light

}

}