71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* Reflow Oven Controller
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*
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* Copyright (C) 2020 Mario Hüttel <mario.huettel@gmx.net>
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*
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* This file is part of the Reflow Oven Controller Project.
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*
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* The reflow oven controller is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the reflow oven controller project.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stm-periph/rng.h>
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#include <stm-periph/clock-enable-manager.h>
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#include <stm32/stm32f4xx.h>
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void random_number_gen_init(bool int_enable)
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{
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rcc_manager_enable_clock(&RCC->AHB2ENR, BITMASK_TO_BITNO(RCC_AHB2ENR_RNGEN));
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__DSB();
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random_number_gen_reset(int_enable);
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}
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void random_number_gen_deinit()
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{
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RNG->CR = 0;
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__DSB();
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rcc_manager_disable_clock(&RCC->AHB2ENR, BITMASK_TO_BITNO(RCC_AHB2ENR_RNGEN));
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}
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void random_number_gen_reset(bool int_en)
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{
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RNG->CR = 0;
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__DSB();
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RNG->CR = RNG_CR_RNGEN | (int_en ? RNG_CR_IE : 0U);
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}
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enum random_number_error random_number_gen_get_number(uint32_t *random_number, bool wait_for_valid_value)
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{
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bool value_ready;
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if (!(RNG->CR & RNG_CR_RNGEN))
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return RNG_ERROR_INACT;
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if (RNG->SR & RNG_SR_SEIS || RNG->SR & RNG_SR_CEIS) {
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/* Error detected */
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return RNG_ERROR_INTERNAL_ERROR;
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}
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/* Check if the value is ready. Wait if wait_for_valid_value is true */
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do {
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value_ready = !!(RNG->SR & RNG_SR_DRDY);
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} while (!value_ready && wait_for_valid_value);
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/* If the value is valid, return it */
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if (value_ready && random_number)
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*random_number = RNG->DR;
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/* Return from function with proper status */
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return (value_ready ? RNG_ERROR_OK : RNG_ERROR_NOT_READY);
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}
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