源:一个简单的伪随机数发生算法
#include <stdint.h>
#include <stdlib.h>
//! rief random seed
static uint16_t s_hwRandomSeed = 0xAA55;
static uint8_t s_chRandomTable[] = {
0x12,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF,
0xF1,0xE2,0xD3,0xC4,0xB5,0xA6,0x97,0x88};
/*!
ote set random generator seed
* param hwSeed random seed
*
eturn none
*/
void set_random_seed( uint16_t hwSeed )
{
s_hwRandomSeed ^= hwSeed;
}
/*!
ote get a random integer
* param none
*
eturn random integer value
*/
uint16_t get_random_u16( void )
{
uint16_t *phwResult = (uint16_t *)&s_chRandomTable[(s_hwRandomSeed & 0x0E)];
*phwResult += s_hwRandomSeed;
s_hwRandomSeed ^= *phwResult;
return *phwResult;
}
/*!
ote get a random byte
* param none
*
eturn random integer value
*/
uint8_t get_random_u8( void )
{
return get_random_u16();
}
最常用的随机算法,C语言标准库函数的结果和这个一致
这里是32位机用的,8位机自己加UL,改int为long
int seed;
void srand(int s)
{
seed = s;
}
int rand()
{
seed = seed * 22695477 + 1;
}