RNG with CC310 Library Causing Board Watch Dog Reset.

RE: RNG with CC310 Library Causing Board Watch Dog Reset.

Kenneth — Thu, 11 Feb 2021 15:31:37 GMT

If you need random generated numbers you can also use the RNG module:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/rng.html
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/hardware_driver_rng.html

The only thing you need to make sure is to enable BIAS correction in CONFIG register. The RNG module is the same as used by the BLE softdevice implementation, so it satisfy the requirements to RNG by the BLE core specification. If the softdevice is enabled you need to use the softdevice api to get the RNG values (then BIAS correction is already enabled).

Best regards,
Kenneth

RE: RNG with CC310 Library Causing Board Watch Dog Reset.

Srinivas V — Thu, 11 Feb 2021 11:53:51 GMT

Hi Kenneth,

Thanks for your reply.

We have configured the WDT with time delay of 13sec. But it is not due to RNG is taking more time, but we continuously hitting the " SaSi_HalWaitInterrupt" this handler and from this Watchdog Reset is occurring.

Can you suggest any other driver which is having the less complexity compared to CC310.

Regards,

Srinivas.V

RE: RNG with CC310 Library Causing Board Watch Dog Reset.

Kenneth — Thu, 11 Feb 2021 11:45:52 GMT

There is no dependency between CC310 and WDT, can it simply be because you are using a very short reload of the watchdog timeout, such that it resets because it's not reloaded?

Kenneth