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/** @defgroup rtc_file RTC
*
* @ingroup STM32F4xx
*
* @brief <b>libopencm3 STM32F4xx RTC</b>
*
* @version 1.0.0
*
* @date 4 March 2013
*
* LGPL License Terms @ref lgpl_license
*/
/*
* This file is part of the libopencm3 project.
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/exti.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/rtc.h>
/*---------------------------------------------------------------------------*/
/** @brief Enable the wakeup timer
@warning You must unlock the registers before using this function
*/
void rtc_enable_wakeup_timer(void)
{
RTC_CR |= RTC_CR_WUTE | (RTC_CR_OSEL_WAKEUP << RTC_CR_OSEL_SHIFT);
rtc_enable_wakeup_timer_interrupt();
}
/*---------------------------------------------------------------------------*/
/** @brief Disable the wakeup timer
@warning You must unlock the registers before using this function
*/
void rtc_disable_wakeup_timer(void)
{
RTC_CR &= ~RTC_CR_WUTE;
rtc_disable_wakeup_timer_interrupt();
}
/*---------------------------------------------------------------------------*/
/** @brief Enable the wakeup timer interrupt
@warning You must unlock the registers before using this function
*/
void rtc_enable_wakeup_timer_interrupt(void)
{
/* FTFM:
* To enable the RTC Wakeup interrupt, the following sequence is
* required:
* 1. Configure and enable the EXTI Line 22 in interrupt mode and
* select the rising edge sensitivity.
*/
exti_enable_request(EXTI22);
exti_set_trigger(EXTI22, EXTI_TRIGGER_RISING);
/* 2. Configure and enable the RTC_WKUP IRQ channel in the NVIC. */
nvic_enable_irq(NVIC_RTC_WKUP_IRQ);
nvic_set_priority(NVIC_RTC_WKUP_IRQ, 1);
/* 3. Configure the RTC to generate the RTC wakeup timer event. */
RTC_CR |= RTC_CR_WUTIE; /* Enable the interrupt */
}
/*---------------------------------------------------------------------------*/
/** @brief Disable the wakeup timer interrupt
@warning You must unlock the registers before using this function
*/
void rtc_disable_wakeup_timer_interrupt(void)
{
/* 1. Disable EXTI Line 22 */
exti_disable_request(EXTI22);
/* 2. Disable RTC_WKUP IRQ channel in the NVIC. */
nvic_disable_irq(NVIC_RTC_WKUP_IRQ);
/* 3. Disable RTC wakeup timer event. */
RTC_CR &= ~RTC_CR_WUTIE;
}
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