;********WAVE-E6000/T************************************
;*MCU:          AT89C51                                 *
;*MCU-crystal:  6M                                      *
;*Version:      00                                      *
;*Last Updata:                                          *
;*Author:       www.picavr.com                          *
;*Description:  用固定種子(x=99)隨機產(chǎn)生[0，255]區(qū)間的數(shù)*

;               在P0、P2口顯示                          *
;********************************************************
#include <reg51.h>
unsigned char y,h,l;
unsigned int i,j;
unsigned long x=99;
unsigned char led[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
                       0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};

void delay(i)
{while(i--)
  {j=7650;while(j--);}
}

unsigned int rand(x)
unsigned long x;
{ x=(25173*x+13849)%65536;
  return x;
}

void main(void)
{ P0=0xf9;P2=0xf9;delay(10);P0=0xff;P2=0xff;    /* 文件名標示 */
  while(1)
   { x=rand(x);        /* 產(chǎn)生[0 - 65535]的隨機數(shù) */
     y=x*255/65535;          /* 轉(zhuǎn)換為[0 - 99]的隨機數(shù) */
     h=y>>4;l=y&0x0f;      /* 分解高四位和第四位 */
     P0=led[h];P2=led[l];
     delay(10);
     P0=0xff;P2=0xff;delay(2);
   }
}