C51 MCU applet (I)

I haven't touched a microcontroller for a long time, so I'm a little rusty. I still vaguely remember sitting in front of a computer screen and learning the microcontroller by myself. I went through the basics of microcontrollers and now it's quite interesting. Attached is a small microcontroller program that I learned when I was a beginner. Please give me your advice!

Use P1 port as output port, connect 8-bit LEDs used for logic level display. Design the program to make the LEDs light up first with odd numbers and then with even numbers at intervals of 300ms, and repeat 3 times; one LED lights up and down 3 times; two LEDs flow from both sides to the middle 3 times; then flow from the middle to both sides 3 times; all 8 LEDs flash 3 times; turn off all LEDs and stop.

Comprehensive experimental procedures:

#Library definition

#include

#include

sbit led=P1^0; #bit definition

int i,j,k,num,e,p,m;            

void delay(int k) #define delay function

{

 while(k--);

}

void timer0() # Initialization of timer 0

{

  TMOD=0X01; #Working mode

    TR0=1;          

    EA=1; # Enable total interrupt

    ET0=1;

    TH0=0XDc; #The timing time needs to be converted

    TL0=0X00;

}

void Pled()     

{

          EA=0;

                        //P1=0xfe;

                //delay(50000);

for(p=0;p<3;p++){               

    P1=0xfe;

    for(num=0;num<8;num++)

    {

   delay(50000);

     P1=_crol_(P1,1); #_crol_ (left shift function)

        if(num==6)

        {

            for(e=0;e<6;e++){

                delay(50000);

    P1=_cror_(P1,1); #_cror_ (left shift function)

 }

 }

            }

}

}

void flowmiddle()

{

for(m=0;m<3;m++)

{   

  P1=0x7e;

    delay(50000);

    P1=0XBD;

    delay(50000);

    P1=0XDB;

    delay(50000);

    P1=0XE7;

    delay(50000);

}

for(m=0;m<3;m++)

{   

        P1=0XE7;

    delay(50000);

    P1=0XDB;

    delay(50000);

    P1=0XBD;

    delay(50000);

    P1=0x7e;

    delay(50000);

}

  for(m=0;m<3;m++){

            P1=0xff;

            delay(50000);

            P1=0;

            delay(50000);

  }

}

void main()

{

    timer0();

     while(1){

       if(j==7)

         { j=0;

     Pled();

     flowmiddle();

} if(j==0)

{

P1=0xff;

}

     }

}

void time0() interrupt 1 #Timer 0 interrupt response

{

    TH0=0Xdc;

    TL0=0X00; //10ms

    i++;

    if(i==30)

    { i=0; 

        j++;

        if(j%2==0){

        P1=0x55;}

        if(j%2!=0)

        {

     P1=0xaa;

}  

  }

}

Instructions for the experimental implementation: Use timer 0 to set a timer for 300ms. By judging whether the variable j is an odd or even number after the timer expires, light up the corresponding small lights. When the variable reaches 7, clear the variable value and execute left and right shift operations, as well as operations flowing to the middle.