Module nrf52::trng

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TRNG driver, nRF5X-family

The TRNG generates 1 byte randomness at the time value in the interval 0 <= r <= 255.

Because that the he capsule requires 4 bytes of randomness at the time. 4 bytes of randomness must be generated before returning back to capsule.

Therefore this module will have to use the TRNG four times. A counter index has been introduced to keep track of this. The four bytes of randomness is stored in a Cell<u32> which shifted according to append one byte at the time.

In the current implementation if done > 4 for some strange reason the random generation will be restarted

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