68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "py/obj.h"
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#include "rng.h"
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#if MICROPY_HW_ENABLE_RNG
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/// \moduleref pyb
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STATIC RNG_HandleTypeDef RNGHandle = {.Instance = NULL};
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void rng_init0(void) {
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// reset the RNG handle
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memset(&RNGHandle, 0, sizeof(RNG_HandleTypeDef));
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RNGHandle.Instance = RNG;
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}
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void rng_init(void) {
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__RNG_CLK_ENABLE();
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HAL_RNG_Init(&RNGHandle);
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}
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uint32_t rng_get(void) {
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if (RNGHandle.State == HAL_RNG_STATE_RESET) {
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rng_init();
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}
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return HAL_RNG_GetRandomNumber(&RNGHandle);
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}
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/// \function rng()
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/// Return a 30-bit hardware generated random number.
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STATIC mp_obj_t pyb_rng_get(void) {
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if (RNGHandle.State == HAL_RNG_STATE_RESET) {
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rng_init();
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}
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return mp_obj_new_int(HAL_RNG_GetRandomNumber(&RNGHandle) >> 2);
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}
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MP_DEFINE_CONST_FUN_OBJ_0(pyb_rng_get_obj, pyb_rng_get);
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#endif // MICROPY_HW_ENABLE_RNG
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