NRF52840: Using the CryptoCell310 with a preemptive OS

[DamianV]

Hi,

I need to use the cryptocell in a project with a preemptive OS. Are there any relevant code examples  available, or at least some general guidelines and precautions (e.g., for the initialization of the cryptocell)?

Thanks,

Damian

[Rudy U]

Thanks for your quick response, Jean-Marc. We have tried the no interrupt library and it seems to be working fine. I guess that why Nordic made this library for the Rtos. Hopefully they fix this interrupt issue in the future :-)

yours sincerely,

Rudy

[Red_devil]

Hi Jean,

I tried the above mentioned solution. I am facing the same issue even after adding "no-interrupts" library.

[WilliamEriksson]

Hi, although a little late here is a snippet that worked for me to mask the basepri:

NVIC_EnableIRQ(CRYPTOCELL_IRQn);
NRF_CRYPTOCELL->ENABLE = 1;

SaSi_LibInit();

/* First read the current basepri value */
uint32_t prevBasepri = __get_BASEPRI();

/* Mask (disable) all interrupts with priority greater or equal to 1 */
__set_BASEPRI( 1 << ( 8 - __NVIC_PRIO_BITS) );

CRYS_RndInit(&state, &buf);

/* Restore the previous basepri */
__set_BASEPRI(prevBasepri);

Related reading where I also posted the snippet:

https://devzone.nordicsemi.com/f/nordic-q-a/45500/nrf52840-and-cc310-random-number-generator-hanging/179450?focus=true