Random number generator example

RE: Random number generator example

grzegorz — Mon, 14 Oct 2024 16:59:24 GMT

Zephyr doesn't matter here, it's always possible. Just use modulo.

int r = sys_rand32_get() % 100;

RE: Random number generator example

mej7000 — Tue, 25 Jun 2024 13:43:55 GMT

This is exactly what I was looking for... But, I would like to limit the range of the random number generated to 0-100. Such as: random(min, max). Is that possible with Zephyr? I'm not seeing it.

RE: Random number generator example

Jerry Easley — Thu, 25 May 2023 20:54:52 GMT

Hi Vidar,

Excellent! Thank you so much!

RE: Random number generator example

Vidar Berg — Thu, 25 May 2023 18:43:35 GMT

Hello,

You can use the random API subsystem (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/services/crypto/random/index.html) for this. To use the API, you simply include the <zephyr/random/rand32.h> header and add CONFIG_ENTROPY_GENERATOR=y to your prj.conf.

Here is a minimal example I made based on the Zephyr 'Hello World' sample:

devzone.nordicsemi.com/.../hello_5F00_world_5F00_rand.zip

Note: CRYPTOCELL — ARM TrustZone CryptoCell 310 is the default entropy source if your build target is 'nrf52840dk_nrf52840'.

Best regards,

Vidar