Kenji Arai / Mbed OS Nucleo_RTC_battery_bkup_pwr_off_okay

In the past, you need modify rtc_api.c in mbed-dev source code. From this revision, you can just use RTC function all of conditions (Normal, Reset, Stand-by, Power OFF).

Note

From now on, you do NOT need any modification for mbed-dev library because STM team updates rtc_api.c source code and support RTC function under reset & standby condition includes power off condition (You need additional VBAT back-up hardware).

Please refer following NOTE information.
/users/kenjiArai/notebook/nucleo-series-rtc-control-under-power-onoff-and-re/

Diff: main.cpp

Revision:
1:7a48c475bbd2
Parent:
0:0751c92c0f71
Child:
2:77ec44bf1fa5
--- a/main.cpp	Sat Feb 07 03:18:40 2015 +0000
+++ b/main.cpp	Sat Feb 14 11:35:34 2015 +0000
@@ -6,7 +6,7 @@
  *  http://www.page.sannet.ne.jp/kenjia/index.html
  *  http://mbed.org/users/kenjiArai/
  *      Created: January   17th, 2015
- *      Revised: Feburary   7th, 2015
+ *      Revised: Feburary  14th, 2015
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
@@ -18,6 +18,7 @@
 //  Include ---------------------------------------------------------------------------------------
 #include "mbed.h"
 #include "TextLCD.h"
+ // MUST -> need to modify rtc_api.c, please refer SetRTC.h file [CATION] and modify_info_xxx.h
 #include "SetRTC.h"
 
 //  Definition ------------------------------------------------------------------------------------
@@ -25,6 +26,11 @@
 
 #define USE_LCD
 
+#if defined(TARGET_NUCLEO_F401RE) || defined(TARGET_NUCLEO_F411RE) || defined(TARGET_NUCLEO_L152RE)
+#else
+#error "Target is only Nucleo F401RE, F411RE and L152RE"
+#endif
+
 //  Object ----------------------------------------------------------------------------------------
 DigitalIn userSW(USER_BUTTON);
 DigitalOut myled(LED1);         // Indicate the sampling period
@@ -73,7 +79,7 @@
     }
     show_RTC_reg(); // only for debug purpose
     while(1) {
-        myled = !myled;
+        myled = 1;
         seconds = time(NULL);
         strftime(buf, 40, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
         pc.printf("[Time] %s", buf);
@@ -88,7 +94,7 @@
         if (counter){
             --counter;
             //      012345678901234567890123456789012345678901234567890123456789012
-            pc.printf("Is time correct? If okay, nothing. If not, please hit any key.\r");
+            pc.printf("Is time correct? If no, hit any key.\r");
             wait(1.0);
             if (pc.readable() == 1){
                 buf[0] = pc.getc();  // dummy read
@@ -110,7 +116,8 @@
 #endif
             pc.printf("\r\nEnter Deep Sleep Mode, please push RESET to wake-up\r\n");
             wait(1.0);
-            myled = 0;       
+            myled = 0;
+            deepsleep_preparation();      
             deepsleep();
         }
     }