C51 Introduction 1, Marquee and LED Experiment

Experiment 1: Flashing an LED

//An LED flashing experiment
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
//Header file
#include
//Port setting
sbit P10=P1^0;

char code dx516[3] _at_ 0x003b;
//Main function
void main(void)
{ uint i;
    P10=0;
    while(1)
  {
  P10=~P10; //Invert
  for (i=0;i<20000;i++);//Delay 
   }
}

Experiment 2: Marquee Experiment

//Marquee experiment
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long

#include
//Port settings
sbit P10=P1^0;
sbit P11=P1^1;
sbit P12=P1^2;
sbit P13=P1^3;
char code dx516[3] _at_ 0x003b;
//Main function
void main(void)
{ uint i;  
    while(1)
  {
  P13=1;P10=0; //Adjacent port inversion
  for (i=0;i<40000;i++); //Delay
  P10=1;P11=0;
  for (i=0;i<40000;i++);
  P11=1;P12=0;
  for (i=0;i<40000;i++);
  P12=1;P13=0;
  for (i=0;i<40000;i++);
   }
}

Experiment 3: One button controls the on and off of an LED

//One button controls the LED
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long

#include
//Port settings
sbit P10=P1^0;
sbit K1=P3^2;
sbit K2=P3^5;
char code dx516[3] _at_ 0x003b;
//Main function
void main(void)
{    
    while(1)
  {
    if (!K1) //Press once
  {
  P10=0; //On
  }
   if (!K2) //Press again
  {
  P10=1; //Off
  }
   }
}

Program with debounce:

//Debounce button control LED light experiment
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long

#include
//Port setting
sbit P10=P1^0; //LED light

sbit K1=P3^2; //key
char code dx516[3] _at_ 0x003b;
//main function
void main(void)
{   
   bit light; 
   uint i; 
   while(1)
  {
   if (!K1) //confirm key is pressed
   {
  for (i=0;i<1000;i++); //delay
   light=~light; //light inversion
   while(!K1); //debounce function
   for (i=0;i<1000;i++); 
  }
  P10=light;
  }
 }