如何对NuMaker-M2354开发板的真随机数发生器TRNG模块进行评测呢

1.测试环境

MDK V5.26.2.0

Nu-Link_Keil_Driver 3.07.7246r

ENV V1.2.0

Python V2.7.13

rt-thread-v4.0.4

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

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

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。

原作者：lianghai