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#include <random.h>
#include <stm32l476xx.h>
#include <clock.h>
void random_init(void)
{
// setup and enable RNG clock
RCC->CCIPR &= ~(RCC_CCIPR_CLK48SEL);
RCC->CCIPR |= RCC_CCIPR_CLK48SEL_1;
RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN;
RNG->CR |= RNG_CR_RNGEN;
}
uint32_t random_get(void)
{
if (RNG->SR & (RNG_SR_SEIS | RNG_SR_CEIS))
return 0;
while (!(RNG->SR & RNG_SR_DRDY))
delay(1);
return RNG->DR;
}
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