/** @brief Randomizes a number.
@param[in] pointer to a uint32_t that will be randomized.
@returns uint8_t, 0 on error, 1 on success.
*/
uint8_t rng_get_random(uint32_t *rand_nr)
{
//wait for data to get ready
while ((RNG_SR & RNG_SR_DRDY) != 1);
//check for clock error
if (RNG_SR & RNG_SR_CECS)
{
//return error
return 0;
}
//check for seed error
if (RNG_SR & RNG_SR_SECS)
{
//disable and enable the RNG to reinitialize and restart the RNG
rng_disable();
rng_enable();
//return with no errors
return 0;
}
//set the random value
*rand_nr = RNG_DR;
//return with no errors
return 1;
}
static int rng_dev_release (struct inode *inode, struct file *filp)
{
rng_disable ();
up (&rng_open_sem);
return 0;
}
