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trezor-firmware/micropython/trezorhal/rng.c

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#include STM32_HAL_H
static RNG_HandleTypeDef rng_handle = {
.Instance = RNG,
};
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int rng_init(void) {
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__HAL_RCC_RNG_CLK_ENABLE();
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HAL_RNG_Init(&rng_handle);
return 0;
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}
uint32_t rng_get(void) {
return HAL_RNG_GetRandomNumber(&rng_handle);
}