micropython/ports/stm32/rng.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
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#include <string.h>
#include "py/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