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51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
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* SPDX-FileCopyrightText: 2010-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Enable early entropy source for RNG
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*
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* Uses the SAR ADC to feed entropy into the HWRNG. The ADC is put
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* into a test mode that reads an internal reference voltage and
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* constantly feeds the LSB of data into the HWRNG. Consult the
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* SoC Technical Reference Manual for more information.
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*
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* Can also be used from app code early during operation, if true
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* random numbers are required before WiFi stack is initialised.
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* Call this function from app code only if WiFi/BT are not yet
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* enabled and I2S and ADC are not in use.
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*
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* Call bootloader_random_disable() when done.
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*/
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void bootloader_random_enable(void);
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/**
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* @brief Disable early entropy source for RNG
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*
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* Disables SAR ADC source and resets the I2S hardware.
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*
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*/
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void bootloader_random_disable(void);
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/**
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* @brief Fill buffer with 'length' random bytes
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*
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* @param buffer Pointer to buffer
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* @param length This many bytes of random data will be copied to buffer
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*/
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void bootloader_fill_random(void *buffer, size_t length);
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#ifdef __cplusplus
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}
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#endif
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