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