Generate random numbers on STM32L4

[DUR (Davide Urbano)]

Hi to all,
I’m using an STM32L4R5ZIT6PU with the last mbed version 6.15.1; I’m trying to use on this mcu the hardware random generator following what I read to this link:

How to generate random numbers (T)RNG

HI @withthegrid trng is a True Random Number Generator, and is used to seed the DRBG. It is not recommended to use directly the trng, as it may be biased. I would suggest you use Mbed Crypto DRBG API, as shown in the example: static void generate_a_random_value(void) { psa_status_t status; uint8_t random[10] = { 0 }; printf("Generate random...\t"); fflush(stdout); /* Initialize PSA Crypto */ status = psa_crypto_init(); if (status != PSA_SUCCESS) { printf…

but I really don’t find how to enable FEATURE_EXPERIMENTAL_API and FEATURE_PSA features. Please, could anyone suggest me how to make it ?
Regards
Davide Urbano