141 lines
4.0 KiB
C
Executable File
141 lines
4.0 KiB
C
Executable File
/*
|
|
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file xWDGv1/hal_wdg_lld.c
|
|
* @brief WDG Driver subsystem low level driver source.
|
|
*
|
|
* @addtogroup WDG
|
|
* @{
|
|
*/
|
|
|
|
#include "hal.h"
|
|
|
|
#if (HAL_USE_WDG == TRUE) || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local definitions. */
|
|
/*===========================================================================*/
|
|
|
|
#define KR_KEY_RELOAD 0xAAAAU
|
|
#define KR_KEY_ENABLE 0xCCCCU
|
|
#define KR_KEY_WRITE 0x5555U
|
|
#define KR_KEY_PROTECT 0x0000U
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
#if STM32_WDG_USE_IWDG || defined(__DOXYGEN__)
|
|
WDGDriver WDGD1;
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver interrupt handlers. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Low level WDG driver initialization.
|
|
*
|
|
* @notapi
|
|
*/
|
|
void wdg_lld_init(void) {
|
|
|
|
#if STM32_WDG_USE_IWDG
|
|
WDGD1.state = WDG_STOP;
|
|
WDGD1.wdg = IWDG;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Configures and activates the WDG peripheral.
|
|
*
|
|
* @param[in] wdgp pointer to the @p WDGDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void wdg_lld_start(WDGDriver *wdgp) {
|
|
|
|
#if STM32_IWDG_IS_WINDOWED
|
|
/* Enable IWDG and unlock for write.*/
|
|
wdgp->wdg->KR = KR_KEY_ENABLE;
|
|
wdgp->wdg->KR = KR_KEY_WRITE;
|
|
|
|
/* Write configuration.*/
|
|
wdgp->wdg->PR = wdgp->config->pr;
|
|
wdgp->wdg->RLR = wdgp->config->rlr;
|
|
while (wdgp->wdg->SR != 0)
|
|
;
|
|
|
|
/* This also triggers a refresh.*/
|
|
wdgp->wdg->WINR = wdgp->config->winr;
|
|
#else
|
|
/* Unlock IWDG.*/
|
|
wdgp->wdg->KR = KR_KEY_WRITE;
|
|
|
|
/* Write configuration.*/
|
|
while (wdgp->wdg->SR != 0)
|
|
;
|
|
wdgp->wdg->PR = wdgp->config->pr;
|
|
wdgp->wdg->RLR = wdgp->config->rlr;
|
|
|
|
/* Start operations.*/
|
|
wdgp->wdg->KR = KR_KEY_RELOAD;
|
|
wdgp->wdg->KR = KR_KEY_ENABLE;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Deactivates the WDG peripheral.
|
|
*
|
|
* @param[in] wdgp pointer to the @p WDGDriver object
|
|
*
|
|
* @api
|
|
*/
|
|
void wdg_lld_stop(WDGDriver *wdgp) {
|
|
|
|
osalDbgAssert(wdgp->state == WDG_STOP,
|
|
"IWDG cannot be stopped once activated");
|
|
}
|
|
|
|
/**
|
|
* @brief Reloads WDG's counter.
|
|
*
|
|
* @param[in] wdgp pointer to the @p WDGDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void wdg_lld_reset(WDGDriver * wdgp) {
|
|
|
|
wdgp->wdg->KR = KR_KEY_RELOAD;
|
|
}
|
|
|
|
#endif /* HAL_USE_WDG == TRUE */
|
|
|
|
/** @} */
|