circuitpython/stmhal/rng.c

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#include <string.h>
#include "stm32f4xx_hal.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "rng.h"
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#if MICROPY_HW_ENABLE_RNG
/// \moduleref pyb
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STATIC RNG_HandleTypeDef RNGHandle = {.Instance = NULL};
void rng_init0(void) {
// reset the RNG handle
memset(&RNGHandle, 0, sizeof(RNG_HandleTypeDef));
RNGHandle.Instance = RNG;
}
void rng_init(void) {
__RNG_CLK_ENABLE();
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HAL_RNG_Init(&RNGHandle);
}
uint32_t rng_get(void) {
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if (RNGHandle.State == HAL_RNG_STATE_RESET) {
rng_init();
}
return HAL_RNG_GetRandomNumber(&RNGHandle);
}
/// \function rng()
/// Return a 30-bit hardware generated random number.
STATIC mp_obj_t pyb_rng_get(void) {
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if (RNGHandle.State == HAL_RNG_STATE_RESET) {
rng_init();
}
return mp_obj_new_int(HAL_RNG_GetRandomNumber(&RNGHandle) >> 2);
}
MP_DEFINE_CONST_FUN_OBJ_0(pyb_rng_get_obj, pyb_rng_get);
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#endif // MICROPY_HW_ENABLE_RNG