80 lines
2.4 KiB
C
80 lines
2.4 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) 2017-2018 Glenn Ruben Bakke
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* Copyright (c) 2018 Ayke van Laethem
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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 "py/mpconfig.h"
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#if MICROPY_HW_ENABLE_RNG
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#include "nrf_rng.h"
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#include "drivers/rng.h"
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#if BLUETOOTH_SD
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#include "nrf_soc.h"
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#include "ble_drv.h"
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#define BLUETOOTH_STACK_ENABLED() (ble_drv_stack_enabled())
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#endif
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static inline uint32_t generate_hw_random(void) {
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uint32_t retval = 0;
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uint8_t * p_retval = (uint8_t *)&retval;
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nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);
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nrf_rng_task_trigger(NRF_RNG, NRF_RNG_TASK_START);
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for (uint16_t i = 0; i < 4; i++) {
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while (!nrf_rng_event_check(NRF_RNG, NRF_RNG_EVENT_VALRDY)) {
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;
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}
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nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);
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p_retval[i] = nrf_rng_random_value_get(NRF_RNG);
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}
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nrf_rng_task_trigger(NRF_RNG, NRF_RNG_TASK_STOP);
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return retval;
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}
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uint32_t rng_generate_random_word(void) {
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#if BLUETOOTH_SD
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if (BLUETOOTH_STACK_ENABLED() == 1) {
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uint32_t retval = 0;
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uint32_t status;
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do {
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status = sd_rand_application_vector_get((uint8_t *)&retval, 4); // Extract 4 bytes
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} while (status != 0);
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return retval;
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}
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#endif
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return generate_hw_random();
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}
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#endif // MICROPY_HW_ENABLE_RNG
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