RT-Thread-【NuMaker-M2354试用】使用TRNG生成随机数RT-Thread问答社区

【NuMaker-M2354试用】使用TRNG生成随机数

发布于 2021-12-18 22:50:39 浏览：696 订阅该版

时间：2021年12月18日
作者：lianghai

**1.测试环境**
MDK V5.26.2.0
Nu-Link_Keil_Driver 3.07.7246r   
[ENV V1.2.0](https://www.rt-thread.org/page/download.html)
[Python V2.7.13 ](https://www.python.org/downloads/release/python-2713/)  
[rt-thread-v4.0.4](https://gitee.com/rtthread/rt-thread/repository/archive/v4.0.4.zip)

**2.测试任务**
本次测试任务为新唐 NuMaker-M2354真随机数发生器TRNG模块

**3.资源介绍**
翻阅新唐M2354数据手册
![image.png](https://oss-club.rt-thread.org/uploads/20211218/c62dc9feef45b7d278e918ac92a618d1.png.webp)
![image.png](https://oss-club.rt-thread.org/uploads/20211218/644fe251ac401a40273c29af041ec5a4.png.webp)
![image.png](https://oss-club.rt-thread.org/uploads/20211218/50a25128ad0f4e01f6a210c24c7b927e.png.webp)

**4.代码**
nu_rng.c
```
int32_t RNG_Random(uint32_t *pu32Buf, int32_t nWords)
{
    int32_t i;
    int32_t timeout = 0x10000;

/* Waiting for Busy */
    while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk) {}

if(nWords > 8)
        nWords = 8;

/* Trig to generate seed 256 bits random number */
    CRPT->PRNG_CTL = (6 << CRPT_PRNG_CTL_KEYSZ_Pos) | CRPT_PRNG_CTL_START_Msk;

while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
    {
        if(timeout-- < 0)
            return 0;
    }

for(i = 0; i < nWords; i++)
    {
        pu32Buf[i] = CRPT->PRNG_KEY[i];
    }

return nWords;
}
```
drv_trng.c
```
#define NU_CRYPTO_TRNG_NAME "nu_TRNG"

/* Private variables ------------------------------------------------------------*/
static struct rt_mutex s_TRNG_mutex;
static int s_i32TRNGEnable = 0;

static rt_uint32_t nu_trng_run(void)
{
    uint32_t u32RNGValue;
    rt_err_t result;

result = rt_mutex_take(&s_TRNG_mutex, RT_WAITING_FOREVER);
    RT_ASSERT(result == RT_EOK);

RNG_Open();

if (RNG_Random(&u32RNGValue, 1) < 0)
    {
        //Failed, use software rand
        u32RNGValue = rand();
    }

result = rt_mutex_release(&s_TRNG_mutex);
    RT_ASSERT(result == RT_EOK);

return u32RNGValue;
}

rt_err_t nu_trng_init(void)
{
    rt_err_t result;

result = rt_mutex_init(&s_TRNG_mutex, NU_CRYPTO_TRNG_NAME, RT_IPC_FLAG_PRIO);
    RT_ASSERT(result == RT_EOK);

s_i32TRNGEnable = 1;
    SYS_ResetModule(TRNG_RST);
    return RT_EOK;
}

void nu_trng_open(void)
{
#if defined(NU_PRNG_USE_SEED)
    srand(NU_PRNG_SEED_VALUE);
#else
    srand(rt_tick_get());
#endif
}

rt_uint32_t nu_trng_rand(struct hwcrypto_rng *ctx)
{
    if (!s_i32TRNGEnable)
    {
        uint32_t u32RNGValue;
        //use software rand
        u32RNGValue = rand();
        return u32RNGValue;
    }

return nu_trng_run();
}
```
main.c
```
rt_uint32_t usr_trng;
int main(int argc, char **argv)
{
#if defined(RT_USING_PIN)
    int counter = 100;
    /* set LEDR pin mode to output */
//    rt_pin_mode(LEDR, PIN_MODE_OUTPUT);

while (counter--)
    {
//        rt_pin_write(LEDR, PIN_HIGH);
//        rt_thread_mdelay(500);
//        rt_pin_write(LEDR, PIN_LOW);
        rt_thread_mdelay(500);
	usr_trng=nu_trng_rand();
    }
#endif
    return 0;
}
```

**5.结果**
![image.png](https://oss-club.rt-thread.org/uploads/20211218/bcd1d39bfd23bf6df0493c815140c09d.png.webp)

**6.心得**
第一次用新唐的开发板，很感兴趣，RT-Thread提供的BSP很全面，功能很强大，基本上直接调用API就可以了，由于身边的工具不够，仅仅通过debug测试了一下TRNG，后面闲下来，再对其他模块测试分享出来