chore(examples): update to manage RTC alarm in BCD or MIX mode

In this sketch the RTC is configured in BCD or MIX mode
(for the stm32 devices that supports it)
An Alarm A is set to wakeup the system from low power
deep sleep.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

examples/AlarmTimedWakeup/AlarmTimedWakeup.ino

@@ -1,9 +1,11 @@
 /*
-  AdvancedTimedWakeup
+  AlarmTimedWakeup
 
-  This sketch demonstrates the usage of Internal Interrupts to wakeup a chip in deep sleep mode.
+  This sketch demonstrates the usage of Internal Interrupts to wakeup a chip in deep sleep mode,
+  when the RTC is configured in BCD or MIX mode (BCD and BINARY)
 
   In this sketch:
+  - RTC is configured in BCD (default) or MIX mode (BCD and BINARY)
   - RTC date and time are configured.
   - Alarm is set to wake up the processor each 'atime' and called a custom alarm callback
   which increment a value and reload alarm with 'atime' offset.
@@ -19,7 +21,7 @@ STM32RTC& rtc = STM32RTC::getInstance();
 
 /* Change this value to set alarm match offset in millisecond */
 /* Note that STM32F1xx does not manage subsecond only second */
-static uint32_t atime = 567;
+static uint32_t atime = 600;
 
 // Declare it volatile since it's incremented inside an interrupt
 volatile int alarmMatch_counter = 0;
@@ -35,21 +37,32 @@ static byte month = 1;
 static byte year = 18;
 
 void setup() {
+#if defined(RTC_BINARY_NONE)
+  // Select RTC clock source: LSI_CLOCK, LSE_CLOCK or HSE_CLOCK.
+  // By default the LSI is selected as source.
+  // rtc.setClockSource(STM32RTC::LSE_CLOCK);
+  // Select the STM32RTC::MODE_BCD or STM32RTC::MODE_MIX
+  // By default the STM32RTC::MODE_BCD is selected.
+  // rtc.setBinaryMode(STM32RTC::MODE_BCD);
+  rtc.begin(true); /* reset the RTC else the binary mode is not changed */
+#else
   rtc.begin();
+#endif /* RTC_BINARY_NONE */
   rtc.setTime(hours, minutes, seconds);
   rtc.setDate(weekDay, day, month, year);
 
   pinMode(LED_BUILTIN, OUTPUT);
 
-  Serial.begin(9600);
+  Serial.begin(115200);
   while (!Serial) {}
+  Serial.println(" Start !");
 
   // Configure low power
   LowPower.begin();
   LowPower.enableWakeupFrom(&rtc, alarmMatch, &atime);
 
   // Configure first alarm in 2 second then it will be done in the rtc callback
-  rtc.setAlarmEpoch( rtc.getEpoch() + 2);
+  rtc.setAlarmEpoch(rtc.getEpoch() + 2);
 }
 
 void loop() {
@@ -63,8 +76,7 @@ void loop() {
   LowPower.deepSleep();
 }
 
-void alarmMatch(void* data)
-{
+void alarmMatch(void* data) {
   // This function will be called once on device wakeup
   // You can do some little operations here (like changing variables which will be used in the loop)
   // Remember to avoid calling delay() and long running functions since this functions executes in interrupt context
@@ -91,7 +103,7 @@ void alarmMatch(void* data)
   //Update epoch_ms - might need to add a second to epoch
   epoc_ms += _millis;
   if (epoc_ms >= 1000) {
-    sec ++;
+    sec++;
     epoc_ms -= 1000;
   }
 #endif