non-random behaviour

[Alan Ambrose]

Hi,

I'm trying to generate some time variant values for testing purposes... rand() always returns 1447534768! This is in the proximity app FWIW.

So, I thought I would use the hardware RNG, looking at the example rng_example. Now:

NRF_RNG->TASKS_START=1;
...
NRF_RNG->EVENTS_VALRDY=0;
while(NRF_RNG->EVENTS_VALRDY==0) {}

Just waits for ever?

Alan

[ovrebekk]

You could try something like this to read out a random buffer of any size:

void get_rnd_buf(uint8_t *buf, uint8_t len)
{
    uint8_t bytes_available;
    do
    {
        sd_rand_application_bytes_available_get(&bytes_available);
        if(bytes_available >= len)
        {
            sd_rand_application_vector_get(buf, len);
            len = 0;
        }
        else
        {
            sd_rand_application_vector_get(buf, bytes_available); 
            buf += bytes_available;
            len -= bytes_available;            
            sd_app_event_wait();  
        }
    }while(len > 0);
}

NB! NOT TESTED, USE AT OWN RISK ;)