add a seconds interrupt feature for the stm32 MCUs

A callback function is attached for this interrupt
The same callback is referenced whatever the device
(stm32F1 or other stm32 soc)

Signed-off-by: Francois Ramu <francois.ramu@st.com>

Author: FRASTM

src/STM32RTC.cpp

@@ -249,6 +249,27 @@ void STM32RTC::detachInterrupt(void)
   detachAlarmCallback();
 }
 
+#ifdef ONESECOND_IRQn
+/**
+  * @brief attach a callback to the RTC Seconds interrupt.
+  * @param callback: pointer to the callback
+  * @retval None
+  */
+void STM32RTC::attachSecondsInterrupt(voidFuncPtr callback)
+{
+  attachSecondsIrqCallback(callback);
+}
+
+/**
+  * @brief detach the RTC Seconds callback.
+  * @retval None
+  */
+void STM32RTC::detachSecondsInterrupt(void)
+{
+  detachSecondsIrqCallback();
+}
+
+#endif /* ONESECOND_IRQn */
 // Kept for compatibility. Use STM32LowPower library.
 void STM32RTC::standbyMode(void)
 {

src/STM32RTC.h

@@ -125,6 +125,12 @@ class STM32RTC {
     void attachInterrupt(voidFuncPtr callback, void *data = nullptr);
     void detachInterrupt(void);
 
+#ifdef ONESECOND_IRQn
+    // Other mcu than stm32F1 will use the WakeUp feature to interrupt each second.
+    void attachSecondsInterrupt(voidFuncPtr callback);
+    void detachSecondsInterrupt(void);
+
+#endif /* ONESECOND_IRQn */
     // Kept for compatibility: use STM32LowPower library.
     void standbyMode();