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Erik Tylek Kettenburg
193
digistump-sam/system/libsam/source/rstc.c
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193
digistump-sam/system/libsam/source/rstc.c
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/**
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* \file
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*
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* \brief Reset Controller (RSTC) driver for SAM.
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*
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* Copyright (c) 2011-2012 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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#include "rstc.h"
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/// @cond 0
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/**INDENT-OFF**/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**INDENT-ON**/
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/// @endcond
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/**
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* \defgroup sam_drivers_rstc_group Reset Controller (RSTC)
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*
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* Driver for the RSTC (Reset Controller). This driver provides access to the main
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* features of the Reset controller.
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*
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* @{
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*/
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#define RSTC_KEY 0xA5000000
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/**
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* \brief Set external reset length.
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*
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* \param p_rstc Pointer to an RSTC instance.
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* \param ul_length The length of external reset.
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*/
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void rstc_set_external_reset(Rstc *p_rstc, const uint32_t ul_length)
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{
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uint32_t mode = p_rstc->RSTC_MR;
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mode &= ~(RSTC_MR_ERSTL_Msk | RSTC_MR_KEY_Msk);
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mode |= (RSTC_MR_ERSTL(ul_length) | RSTC_KEY);
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p_rstc->RSTC_MR = mode;
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}
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/**
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* \brief Enable user reset.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*/
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void rstc_enable_user_reset(Rstc *p_rstc)
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{
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uint32_t mode = p_rstc->RSTC_MR;
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mode &= ~RSTC_MR_KEY_Msk;
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mode |= (RSTC_MR_URSTEN | RSTC_KEY);
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p_rstc->RSTC_MR = mode;
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}
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/**
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* \brief Disable user reset.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*/
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void rstc_disable_user_reset(Rstc *p_rstc)
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{
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uint32_t mode = p_rstc->RSTC_MR;
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mode &= ~(RSTC_MR_URSTEN | RSTC_MR_KEY_Msk);
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mode |= RSTC_KEY;
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p_rstc->RSTC_MR = mode;
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}
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/**
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* \brief Enable user reset interrupt.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*/
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void rstc_enable_user_reset_interrupt(Rstc *p_rstc)
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{
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uint32_t mode = p_rstc->RSTC_MR;
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mode &= ~RSTC_MR_KEY_Msk;
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mode |= (RSTC_MR_URSTIEN | RSTC_KEY);
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p_rstc->RSTC_MR = mode;
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}
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/**
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* \brief Disable user reset interrupt.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*/
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void rstc_disable_user_reset_interrupt(Rstc *p_rstc)
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{
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uint32_t mode = p_rstc->RSTC_MR;
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mode &= ~(RSTC_MR_URSTIEN | RSTC_MR_KEY_Msk);
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mode |= RSTC_KEY;
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p_rstc->RSTC_MR = mode;
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}
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/**
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* \brief Perform software reset.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*/
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void rstc_start_software_reset(Rstc *p_rstc)
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{
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p_rstc->RSTC_CR = RSTC_KEY | RSTC_CR_PROCRST | RSTC_CR_PERRST;
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}
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/**
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* \brief Asserts the NRST pin for external resets.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*/
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void rstc_reset_extern(Rstc *p_rstc)
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{
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p_rstc->RSTC_CR = RSTC_KEY | RSTC_CR_EXTRST;
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}
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/**
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* \brief Get RSTC status.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*
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* \return RSTC status.
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*/
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uint32_t rstc_get_status(Rstc *p_rstc)
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{
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return p_rstc->RSTC_SR;
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}
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/**
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* \brief Get reset cause.
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*
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* \param p_rstc Pointer to an RSTC instance.
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*
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* \return The last reset cause.
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*/
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uint32_t rstc_get_reset_cause(Rstc *p_rstc)
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{
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return (p_rstc->RSTC_SR & RSTC_SR_RSTTYP_Msk);
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}
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//@}
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/// @cond 0
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/**INDENT-OFF**/
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#ifdef __cplusplus
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}
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#endif
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/**INDENT-ON**/
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/// @endcond
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