STM32 C51 生成随机数

产生随机数

//HEAD FILE
#include "stdio.h"
#include "stdlib.h"

/*产生随机数*/
void BuildRandomSequence(unsigned char * data,const unsigned int len,const unsigned int seed)
{
	unsigned char temp,xr;
	unsigned int i=0;
	for(i=0; i<len; i++)
	{
		data[i] = i;
	}
	srand(seed);
	for(i=0; i<len; i++)
	{   
		xr=rand()%len;
		temp=data[i];
		data[i]=data[xr];
		data[xr]=temp;
	}
}

void main(){
	
	unsigned char buf[255] ;  //随机数组 
	unsigned int  len = 5 ;   //随机长度 
	unsigned int  seed = 2 ;  //随机种子 
	unsigned char s[100];
	unsigned char *i;
	BuildRandomSequence(buf,len,seed);
	for(i = &buf[0] ;i < &buf[len];i++)
	{
		printf(" %d",*i);	
	}	
}