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/**
* \file
*
* \brief SAM True Random Number Generator (TRNG) Driver
*
* Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* 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
* EXPRESSLY AND SPECIFICALLY 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.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifndef TRNG_CALLBACK_H_INCLUDED
#define TRNG_CALLBACK_H_INCLUDED
#ifdef __cplusplus
extern "C" {
#endif
/**
* \addtogroup asfdoc_sam0_trng_group
*
* @{
*/
#include <trng.h>
/**
* Enum for the possible types of TRNG asynchronous jobs that may be issued to
* the driver.
*/
enum trng_job_type {
/** Asynchronous TRNG read into a user provided buffer */
TRNG_JOB_READ_BUFFER,
};
/**
* \name Callback Management
* @{
*/
enum status_code trng_register_callback(
struct trng_module *const module,
trng_callback_t callback_func,
enum trng_callback callback_type);
enum status_code trng_unregister_callback(
struct trng_module *module,
enum trng_callback callback_type);
/**
* \brief Enables callback
*
* Enables the callback function registered by \ref
* trng_register_callback. The callback function will be called from the
* interrupt handler when the conditions for the callback type are met.
*
* \param[in] module Pointer to TRNG software instance struct
* \param[in] callback_type Callback type given by an enum
*/
static inline void trng_enable_callback(
struct trng_module *const module,
enum trng_callback callback_type)
{
/* Sanity check arguments */
Assert(module);
/* Enable callback */
module->enable_callback_mask |= (1 << callback_type);
}
/**
* \brief Disables callback
*
* Disables the callback function registered by the \ref
* trng_register_callback.
*
* \param[in] module Pointer to TRNG software instance struct
* \param[in] callback_type Callback type given by an enum
*/
static inline void trng_disable_callback(
struct trng_module *const module,
enum trng_callback callback_type)
{
/* Sanity check arguments */
Assert(module);
/* Disable callback */
module->enable_callback_mask &= ~(1UL << callback_type);
/* Disable data ready interrupt */
if (callback_type == TRNG_CALLBACK_READ_BUFFER) {
module->hw->INTENCLR.reg = TRNG_INTENCLR_DATARDY;
}
}
/** @} */
/**
* \name Job Management
* @{
*/
enum status_code trng_read_buffer_job(
struct trng_module *const module_inst,
uint32_t *buffer,
uint32_t number);
enum status_code trng_get_job_status(
struct trng_module *module_inst,
enum trng_job_type type);
void trng_abort_job(
struct trng_module *module_inst,
enum trng_job_type type);
/** @} */
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* TRNG_CALLBACK_H_INCLUDED */
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