141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file wdg_lld.c
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* @brief WDG Driver subsystem low level driver source.
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*
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* @addtogroup WDG
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_WDG || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#define KR_KEY_RELOAD 0xAAAAU
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#define KR_KEY_ENABLE 0xCCCCU
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#define KR_KEY_WRITE 0x5555U
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#define KR_KEY_PROTECT 0x0000U
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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#if STM32_WDG_USE_IWDG || defined(__DOXYGEN__)
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WDGDriver WDGD1;
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#endif
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level WDG driver initialization.
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*
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* @notapi
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*/
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void wdg_lld_init(void) {
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#if STM32_WDG_USE_IWDG
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WDGD1.state = WDG_STOP;
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WDGD1.wdg = IWDG;
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#endif
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}
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/**
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* @brief Configures and activates the WDG peripheral.
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*
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* @param[in] wdgp pointer to the @p WDGDriver object
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*
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* @notapi
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*/
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void wdg_lld_start(WDGDriver *wdgp) {
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#if STM32_IWDG_IS_WINDOWED
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/* Enable IWDG and unlock for write.*/
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wdgp->wdg->KR = KR_KEY_ENABLE;
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wdgp->wdg->KR = KR_KEY_WRITE;
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/* Write configuration.*/
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wdgp->wdg->PR = wdgp->config->pr;
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wdgp->wdg->RLR = wdgp->config->rlr;
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while (wdgp->wdg->SR != 0)
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;
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/* This also triggers a refresh.*/
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wdgp->wdg->WINR = wdgp->config->winr;
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#else
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/* Unlock IWDG.*/
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wdgp->wdg->KR = KR_KEY_WRITE;
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/* Write configuration.*/
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wdgp->wdg->PR = wdgp->config->pr;
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wdgp->wdg->RLR = wdgp->config->rlr;
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while (wdgp->wdg->SR != 0)
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;
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/* Start operations.*/
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wdgp->wdg->KR = KR_KEY_RELOAD;
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wdgp->wdg->KR = KR_KEY_ENABLE;
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#endif
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}
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/**
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* @brief Deactivates the WDG peripheral.
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*
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* @param[in] wdgp pointer to the @p WDGDriver object
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*
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* @api
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*/
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void wdg_lld_stop(WDGDriver *wdgp) {
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osalDbgAssert(wdgp->state == WDG_STOP,
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"IWDG cannot be stopped once activated");
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}
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/**
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* @brief Reloads WDG's counter.
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*
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* @param[in] idwgp pointer to the @p WDGDriver object
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*
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* @notapi
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*/
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void wdg_lld_reset(WDGDriver * wdgp) {
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wdgp->wdg->KR = KR_KEY_RELOAD;
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}
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#endif /* HAL_USE_WDG */
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/** @} */
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