/** @defgroup rtc_file RTC @ingroup STM32F4xx @brief libopencm3 STM32F4xx RTC @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 . */ #include #include #include #include /*---------------------------------------------------------------------------*/ /** @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; }