#include "random.h"
#include "base.h"
#include "stm32f4xx.h"

static int g_inited = 0;
void RANDOM_Init(void) {
  if (g_inited == 0) {
    RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
    RNG_Cmd(ENABLE);
    RANDOM_Get();
    g_inited = 1;
  }
}

uint32_t RANDOM_Get(void) {
  if (RNG->CR & RNG_CR_RNGEN) {
    while (RNG_GetFlagStatus(RNG_FLAG_DRDY) != SET)
      ;
    return RNG_GetRandomNumber();
  } else
    return 0;
}