1 files changed, 97 insertions, 0 deletions
diff --git a/libopencm3/lib/stm32/f4/rtc.c b/libopencm3/lib/stm32/f4/rtc.c
new file mode 100644
index 0000000..f08ac2b
--- /dev/null
+++ b/libopencm3/lib/stm32/f4/rtc.c
@@ -0,0 +1,97 @@
+/** @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;
+}