50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 2010-2021 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stddef.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @brief Enable early entropy source for RNG
|
|
*
|
|
* Uses the SAR ADC to feed entropy into the HWRNG. The ADC is put
|
|
* into a test mode that reads the 1.1V internal reference source and
|
|
* feeds the LSB of data into the HWRNG.
|
|
*
|
|
* Can also be used from app code early during operation, if entropy
|
|
* is required before WiFi stack is initialised. Call this function
|
|
* from app code only if WiFi/BT are not yet enabled and I2S and SAR
|
|
* ADC are not in use.
|
|
*
|
|
* Call bootloader_random_disable() when done.
|
|
*/
|
|
void bootloader_random_enable(void);
|
|
|
|
/**
|
|
* @brief Disable early entropy source for RNG
|
|
*
|
|
* Disables SAR ADC source and resets the I2S hardware.
|
|
*
|
|
*/
|
|
void bootloader_random_disable(void);
|
|
|
|
/**
|
|
* @brief Fill buffer with 'length' random bytes
|
|
*
|
|
* @param buffer Pointer to buffer
|
|
* @param length This many bytes of random data will be copied to buffer
|
|
*/
|
|
void bootloader_fill_random(void *buffer, size_t length);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|