งานหา micro 15

Random Number Generator 

#include<reg51.h>
#define lcd P0

sbit rs=P2^0;
sbit e=P2^1;
sbit sw=P3^0;
sbit rst=P3^1;

unsigned int i=0;

void delay (int);
void display (unsigned char);
void cmd (unsigned char);
void string (char *);
void init (void);
void int_lcd(unsigned int);


void delay (int d)
{
 unsigned char i=0;
 for(;d>0;d--)
 {
  for(i=250;i>0;i--);
  for(i=248;i>0;i--);
 }
}

void cmd (unsigned char c)
{
 lcd=c;
 rs=0;
 e=1;
 delay(5);
 e=0;
}

void display (unsigned char c)
{
 lcd=c;
 rs=1;
 e=1;
 delay(5);
 e=0;
}
void string (char *p)
{
 while(*p)
 {
  display(*p++);
 }
}

void init (void)
{
 cmd(0x38);
 cmd(0x0c);
 cmd(0x01);
 cmd(0x80);
}

void int_lcd(unsigned int n)
{
 char a[4]={0},i=0;
   if(n==0)
  {
   display('0');
   return;
  }
 else
  {
   while(n>0)
    {
     a[i++]=(n%10)+48;
     n/=10;
    }
   for(--i;i>=0;i--)
    {
     display(a[i]);
    }
  }
}

void main()
{
 sw=1;
 rst=1;
 init();
 cmd(0x80);
 string(" Random Number  ");
 cmd(0xc0);
 string("   Generator    ");
 delay(2000);
 cmd(0x01);
 while(1)
 {
  cmd(0x80);
  string("Press the button");
  while(sw!=0)
   {
    i=++i;
    if(i==100)
     i=0;
   } 
  cmd(0x80);
  string("RAND NUM:       ");
  cmd(0x8a);
  int_lcd(i);
  while(rst!=0);
  //cmd(0x01);
 }
}