How long KL81 TRNG module needs to generate 1M bytes random data?

daweiy — Tue, 01 Aug 2017 01:41:49 GMT

Hi guys,

Currently, I am using KL81 to generate 1M bytes random data. It took me nearly 2 hours to finish it. The random data is sent out through UART. I did a measurement, 98.4% of the time is used by TRNG module, 1.6% of the time is used in UART communication.

I am using SDK library API, TRNG_DRV_GetRandomData(), to get 128 bytes random data at each call. The configuration of TRNG is got from TRNG_DRV_InitUserConfigDefault() and done by TRNG_DRV_Init(). The board is using external clock which is 12MHz and the system clock has been configured to 72 MHz because CLOCK_INIT_CONFIG has been configured to CLOCK_RUN.

By my understanding, if the random number generation is done by hardware, it should be much faster than by software. But under current situation, I just wondering to know is it normal or I have done something wrong?

Thanks,

Dawei

PS: the default entropy delay is 3200, after I changed it to 1500, 1M bytes data generation takes 50 minutes to finish. This is good but still not good enough to me. Please advise, thanks.

Kinetis MicrocontrollersのトピックHow long KL81 TRNG module needs to generate 1M bytes random data?

How long KL81 TRNG module needs to generate 1M bytes random data?