/* ----------------------------------------------------------------------------
 *         SAM Software Package License
 * ----------------------------------------------------------------------------
 * Copyright (c) 2015, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ----------------------------------------------------------------------------
 */

#ifndef _TRNG_H_
#define _TRNG_H_

/*------------------------------------------------------------------------------
 *         Headers
 *------------------------------------------------------------------------------*/

#include <stdint.h>
#include "chip.h"

/*------------------------------------------------------------------------------
 *         Types
 *------------------------------------------------------------------------------*/

typedef void (*trng_callback_t)(uint32_t random_value, void* user_arg);

/*------------------------------------------------------------------------------
 *         Exported functions
 *------------------------------------------------------------------------------*/

/**
 * \brief Enables the TRNG.
 */
extern void trng_enable(void);

/**
 * \brief Disables the TRNG.
 */
extern void trng_disable(void);

/**
 * \brief Enable the TRNG interrupt, the callback will be called for each new
 * generated random value.
 *
 * \param cb user callback
 * \param user_arg user argument passed as-is to the callback
 */
extern void trng_enable_it(trng_callback_t cb, void* user_arg);

/**
 * \brief Disable the TRNG interrupt.
 */
extern void trng_disable_it(void);

/**
 * \brief Get the next random value generated by the TRNG. This function will
 * block until a value is available.
 * \return a random value
 */
extern uint32_t trng_get_random_data(void);

#endif /* _TRNG_H_ */