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/*
ChibiOS - Copyright (C) 2016 Stephane D'Alu
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 NRF5/LLD/hal_wdg_lld.c
* @brief NRF5 Watchdog Driver subsystem low level driver source template.
*
* @addtogroup WDG
* @{
*/
#include "hal.h"
#if HAL_USE_WDG || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define RELOAD_REQUEST_VALUE 0x6E524635
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
WDGDriver WDGD1;
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if WDG_USE_TIMEOUT_CALLBACK == TRUE
/**
* @brief Watchdog vector.
* @details This interrupt is used when watchdog timeout.
*
* @note Only 2 cycles at NRF5_LFCLK_FREQUENCY are available
* to they good bye.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector80) {
OSAL_IRQ_PROLOGUE();
osalSysLockFromISR();
/* Notify */
if (WDGD1.config->callback)
WDGD1.config->callback();
/* Wait for reboot */
while (1) { /* */ }
osalSysUnlockFromISR();
OSAL_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level WDG driver initialization.
*
* @notapi
*/
void wdg_lld_init(void) {
WDGD1.state = WDG_STOP;
WDGD1.wdt = NRF_WDT;
}
/**
* @brief Configures and activates the WDG peripheral.
*
* @note Once started there is no way out.
*
* @param[in] wdgp pointer to the @p WDGDriver object
*
* @notapi
*/
void wdg_lld_start(WDGDriver *wdgp) {
osalDbgAssert((wdgp->state == WDG_STOP),
"This WDG driver cannot be restarted once activated");
/* Generate interrupt on timeout */
#if WDG_USE_TIMEOUT_CALLBACK == TRUE
wdgp->wdt->INTENSET = WDT_INTENSET_TIMEOUT_Msk;
#endif
/* When to pause? (halt, sleep) */
uint32_t config = 0;
if (!wdgp->config->pause_on_sleep)
config |= WDT_CONFIG_SLEEP_Msk;
if (!wdgp->config->pause_on_halt)
config |= WDT_CONFIG_HALT_Msk;
wdgp->wdt->CONFIG = config;
/* Timeout in milli-seconds */
uint64_t tout = (NRF5_LFCLK_FREQUENCY * wdgp->config->timeout_ms / 1000) - 1;
osalDbgAssert(tout <= 0xFFFFFFFF, "watchdog timout value exceeded");
wdgp->wdt->CRV = (uint32_t)tout;
/* Reload request (using RR0) */
wdgp->wdt->RREN = WDT_RREN_RR0_Msk;
/* Say your prayers, little one. */
wdgp->wdt->TASKS_START = 1;
}
/**
* @brief Deactivates the WDG peripheral.
*
* @param[in] wdgp pointer to the @p WDGDriver object
*
* @api
*/
void wdg_lld_stop(WDGDriver *wdgp) {
(void)wdgp;
osalDbgAssert(false, "This WDG driver 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->wdt->RR[0] = RELOAD_REQUEST_VALUE;
}
#endif /* HAL_USE_WDG */
/** @} */
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