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-rw-r--r--lib/stm32/f4/rtc.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/lib/stm32/f4/rtc.c b/lib/stm32/f4/rtc.c
index 1b301fa..5f6627f 100644
--- a/lib/stm32/f4/rtc.c
+++ b/lib/stm32/f4/rtc.c
@@ -25,3 +25,61 @@
#include <libopencm3/stm32/rtc.h>
#include <libopencm3/stm32/common/rtc_common_bcd.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;
+}