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/*
Copyright (C) 2014..2017 Marco Veeneman
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 WDT/hal_wdg_lld.c
* @brief WDG Driver subsystem low level driver source.
*
* @addtogroup WDG
* @{
*/
#include "hal.h"
#if HAL_USE_WDG || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
#if TIVA_WDG_USE_WDT0 || defined(__DOXYGEN__)
WDGDriver WDGD1;
#endif /* TIVA_WDG_USE_WDT0 */
#if TIVA_WDG_USE_WDT1 || defined(__DOXYGEN__)
WDGDriver WDGD2;
#endif /* TIVA_WDG_USE_WDT1 */
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Shared IRQ handler.
*
* @param[in] wdgp pointer to @p WDGDriver object.
*/
static void serve_interrupt(WDGDriver *wdgp)
{
uint32_t mis;
mis = HWREG(wdgp->wdt + WDT_O_MIS);
if (mis & WDT_MIS_WDTMIS) {
/* Invoke callback, if any */
if (wdgp->config->callback) {
if (wdgp->config->callback(wdgp)) {
/* Clear interrupt */
HWREG(wdgp->wdt + WDT_O_ICR) = 0;
wdgTivaSyncWrite(wdgp);
}
}
}
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if TIVA_WDG_USE_WDT0 || TIVA_WDG_USE_WDT1
/**
* @brief WDT0/WDT1 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(TIVA_WDT_HANDLER)
{
OSAL_IRQ_PROLOGUE();
#if TIVA_WDG_USE_WDT0
serve_interrupt(&WDGD1);
#endif
#if TIVA_WDG_USE_WDT1
serve_interrupt(&WDGD2);
#endif
OSAL_IRQ_EPILOGUE();
}
#endif /* TIVA_WDG_USE_WDT0 || TIVA_WDG_USE_WDT1 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level WDG driver initialization.
*
* @notapi
*/
void wdg_lld_init(void)
{
#if TIVA_WDG_USE_WDT0
WDGD1.state = WDG_STOP;
WDGD1.wdt = WATCHDOG0_BASE;
#endif /* TIVA_WDG_USE_WDT0 */
#if TIVA_WDG_USE_WDT1
WDGD2.state = WDG_STOP;
WDGD2.wdt = WATCHDOG1_BASE;
#endif /* TIVA_WDG_USE_WDT1 */
/* The shared vector is initialized on driver initialization and never
disabled because it is shared between the Watchdog Timers.*/
nvicEnableVector(TIVA_WDT_NUMBER, TIVA_WDG_WDT_IRQ_PRIORITY);
}
/**
* @brief Configures and activates the WDG peripheral.
*
* @param[in] wdgp pointer to the @p WDGDriver object
*
* @notapi
*/
void wdg_lld_start(WDGDriver *wdgp)
{
#if TIVA_WDG_USE_WDT0
if (&WDGD1 == wdgp) {
HWREG(SYSCTL_RCGCWD) |= (1 << 0);
while (!(HWREG(SYSCTL_PRWD) & (1 << 0)))
;
}
#endif /* TIVA_WDG_USE_WDT0 */
#if TIVA_WDG_USE_WDT1
if (&WDGD2 == wdgp) {
HWREG(SYSCTL_RCGCWD) |= (1 << 1);
while (!(HWREG(SYSCTL_PRWD) & (1 << 1)))
;
}
#endif /* TIVA_WDG_USE_WDT1 */
HWREG(wdgp->wdt + WDT_O_LOAD) = wdgp->config->load;
wdgTivaSyncWrite(wdgp);
HWREG(wdgp->wdt + WDT_O_TEST) = wdgp->config->test;
wdgTivaSyncWrite(wdgp);
HWREG(wdgp->wdt + WDT_O_CTL) |= WDT_CTL_RESEN;
wdgTivaSyncWrite(wdgp);
HWREG(wdgp->wdt + WDT_O_CTL) |= WDT_CTL_INTEN;
wdgTivaSyncWrite(wdgp);
}
/**
* @brief Deactivates the WDG peripheral.
*
* @param[in] wdgp pointer to the @p WDGDriver object
*
* @api
*/
void wdg_lld_stop(WDGDriver *wdgp)
{
#if TIVA_WDG_USE_WDT0
if (&WDGD1 == wdgp) {
HWREG(SYSCTL_SRWD) |= (1 << 0);
HWREG(SYSCTL_SRWD) &= ~(1 << 0);
}
#endif /* TIVA_WDG_USE_WDT0 */
#if TIVA_WDG_USE_WDT1
if (&WDGD2 == wdgp) {
HWREG(SYSCTL_SRWD) |= (1 << 1);
HWREG(SYSCTL_SRWD) &= ~(1 << 1);
}
#endif /* TIVA_WDG_USE_WDT1 */
}
/**
* @brief Reloads WDG's counter.
*
* @param[in] wdgp pointer to the @p WDGDriver object
*
* @notapi
*/
void wdg_lld_reset(WDGDriver *wdgp)
{
#if defined(TM4C123_USE_REVISION_6_FIX) || defined(TM4C123_USE_REVISION_7_FIX)
#if TIVA_WDG_USE_WDT1
if (&WDGD2 == wdgp) {
/* Number: WDT#02
* Description: Periodically reloading the count value into the Watchdog
* Timer Load (WDTLOAD) register of the Watchdog Timer 1
* module will not restart the count, as specified in the data
* sheet.
* Workaround: Disable the Watchdog Timer 1 module by setting the
* appropriate bit in the Watchdog Timer Software Reset (SRWD)
* register before reprogramming the counter.*/
wdg_lld_stop(wdgp);
wdg_lld_start(wdgp);
return;
}
#endif /* TIVA_WDG_USE_WDT1 */
#endif /* defined(TM4C123_USE_REVISION_6_FIX) ||
defined(TM4C123_USE_REVISION_7_FIX) */
HWREG(wdgp->wdt + WDT_O_LOAD) = wdgp->config->load;
wdgTivaSyncWrite(wdgp);
}
#endif /* HAL_USE_WDG */
#if TIVA_WDG_USE_WDT1
/**
* @brief synchronize after a write to a watchdog register.
*
* @param[in] wdgp pointer to the @p WDGDriver object.
*/
void wdgTivaSyncWrite(WDGDriver *wdgp)
{
if (&WDGD2 == wdgp) {
while (!(HWREG(wdgp->wdt + WDT_O_CTL) & CTL_WRC)) {
;
}
}
}
#endif /* TIVA_WDG_USE_WDT1 */
/** @} */
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