// Copyright 2010-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <stddef.h>
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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 the 1.1V internal reference source and
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* feeds the LSB of data into the HWRNG.
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*
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* Can also be used from app code early during operation, if entropy
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* is required before WiFi stack is initialised. Call this function
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* from app code only if WiFi/BT are not yet enabled and I2S and SAR
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* 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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