102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
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/**
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* \file
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*
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* \brief SAM True Random Number Generator (TRNG) Driver
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*
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* Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#include "trng.h"
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/**
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* \brief Initializes a hardware TRNG module instance.
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*
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* Enables the clock and initializes the TRNG module, based on the given
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* configuration values.
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*
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* \param[in,out] module_inst Pointer to the software module instance struct
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* \param[in] hw Pointer to the TRNG hardware module
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* \param[in] config Pointer to the TRNG configuration options struct
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*
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* \return Status of the initialization procedure.
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*
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* \retval STATUS_OK The module was initialized successfully
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*/
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enum status_code trng_init(
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struct trng_module *const module_inst,
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Trng *const hw,
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struct trng_config *const config)
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{
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/* Sanity check arguments */
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Assert(module_inst);
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Assert(hw);
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Assert(config);
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/* Initialize device instance */
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module_inst->hw = hw;
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/* Turn on the digital interface clock */
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system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, MCLK_APBCMASK_TRNG);
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#if TRNG_CALLBACK_MODE == true
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/* Initialize parameters */
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for (uint8_t i = 0; i < TRNG_CALLBACK_N; i++) {
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module_inst->callback[i] = NULL;
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}
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/* Initialize software flags*/
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module_inst->register_callback_mask = 0x00;
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module_inst->enable_callback_mask = 0x00;
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module_inst->job_buffer = NULL;
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module_inst->remaining_number = 0;
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module_inst->job_status = STATUS_OK;
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/* Register this instance for callbacks*/
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_trng_instance = module_inst;
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#endif
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/* Write configuration to module */
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hw->CTRLA.reg = ((uint32_t)config->run_in_standby << TRNG_CTRLA_RUNSTDBY_Pos);
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return STATUS_OK;
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}
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