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/*
* Copyright (C) 2014-2016 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup drivers_periph_hwrng HWRNG Abstraction
* @ingroup drivers_periph
* @brief Peripheral hardware random number generator interface
*
* The HWRNG interface abstracts means provided by MCU peripherals to create
* random number. On most platforms, these peripherals are called something like
* 'hardware random number generator' or 'pseudo random number generator'. The
* quality of the created random data does differ quite a bit between different
* MCUs, so please refer to your MCUs reference manual for information on this!
*
* @note Refer to your platforms MCU reference manual for information on the
* quality of the used (pseudo) random number generator!
*
* @{
* @file
* @brief Hardware random number generator driver interface
*
* @author Christian Mehlis <mehlis@inf.fu-berlin.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef PERIPH_HWRNG_H
#define PERIPH_HWRNG_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Initialize the hardware random number generator
*
* On some platforms, the random number generator needs some global
* initialization before it can be used. This should happen in this function
* if it would impose too much overhead to do this everytime the hwrng_read
* function is called. The device should however be put into power-off mode
* after initialization and will be powered on and of when hwrng_read is called.
*/
void hwrng_init(void);
/**
* @brief Read N bytes of random data from the hardware device
*
* The read function should power on the HWRNG MCU peripheral, read the given
* number of random bytes and than put the peripheral back to sleep.
*
* @param[in] buf destination buffer to write the bytes to
* @param[in] num number of bytes to get from device
*/
void hwrng_read(uint8_t *buf, unsigned int num);
#ifdef __cplusplus
}
#endif
#endif /* PERIPH_HWRNG_H */
/** @} */
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