update nucleo l476 config and code to support the RTC and the alarms functionality

configs/nucleo-l476rg/nsh/defconfig

@@ -69,6 +69,7 @@ CONFIG_DEBUG_LIB=y
 CONFIG_DEBUG_LEDS=y
 CONFIG_DEBUG_ANALOG=y
 CONFIG_DEBUG_GPIO=y
+# CONFIG_DEBUG_RTC is not set
 CONFIG_DEBUG_SPI=y
 CONFIG_ARCH_HAVE_STACKCHECK=y
 # CONFIG_STACK_COLORATION is not set
@@ -290,6 +291,9 @@ CONFIG_STM32L4_FIREWALL=y
 CONFIG_STM32L4_FLASH_PREFETCH=y
 CONFIG_STM32L4_DISABLE_IDLE_SLEEP_DURING_DEBUG=y
 # CONFIG_ARCH_BOARD_STM32L4_CUSTOM_CLOCKCONFIG is not set
+CONFIG_STM32L4_RTC_LSECLOCK=y
+# CONFIG_STM32L4_RTC_LSICLOCK is not set
+# CONFIG_STM32L4_RTC_HSECLOCK is not set
 CONFIG_STM32L4_SAI1PLL=y
 # CONFIG_STM32L4_SAI2PLL is not set
 
@@ -377,7 +381,14 @@ CONFIG_NSH_MMCSDMINOR=0
 #
 # Board-Specific Options
 #
-# CONFIG_LIB_BOARDCTL is not set
+CONFIG_LIB_BOARDCTL=y
+# CONFIG_BOARDCTL_RESET is not set
+# CONFIG_BOARDCTL_UNIQUEID is not set
+# CONFIG_BOARDCTL_TSCTEST is not set
+# CONFIG_BOARDCTL_ADCTEST is not set
+# CONFIG_BOARDCTL_PWMTEST is not set
+# CONFIG_BOARDCTL_GRAPHICS is not set
+# CONFIG_BOARDCTL_IOCTL is not set
 
 #
 # RTOS Features
@@ -396,9 +407,6 @@ CONFIG_USEC_PER_TICK=10000
 # CONFIG_SYSTEM_TIME64 is not set
 # CONFIG_CLOCK_MONOTONIC is not set
 # CONFIG_JULIAN_TIME is not set
-CONFIG_START_YEAR=2014
-CONFIG_START_MONTH=5
-CONFIG_START_DAY=5
 CONFIG_MAX_WDOGPARMS=2
 CONFIG_PREALLOC_WDOGS=8
 CONFIG_WDOG_INTRESERVE=1
@@ -517,7 +525,13 @@ CONFIG_SPI_EXCHANGE=y
 # Timer Driver Support
 #
 # CONFIG_TIMER is not set
-# CONFIG_RTC is not set
+CONFIG_RTC=y
+CONFIG_RTC_DATETIME=y
+CONFIG_RTC_ALARM=y
+CONFIG_RTC_NALARMS=2
+CONFIG_RTC_DRIVER=y
+CONFIG_RTC_IOCTL=y
+# CONFIG_RTC_EXTERNAL is not set
 # CONFIG_WATCHDOG is not set
 # CONFIG_ANALOG is not set
 # CONFIG_AUDIO_DEVICES is not set
@@ -755,6 +769,11 @@ CONFIG_BUILTIN_PROXY_STACKSIZE=1024
 #
 # Examples
 #
+CONFIG_EXAMPLES_ALARM=y
+CONFIG_EXAMPLES_ALARM_PRIORITY=100
+CONFIG_EXAMPLES_ALARM_STACKSIZE=2048
+CONFIG_EXAMPLES_ALARM_DEVPATH="/dev/rtc0"
+CONFIG_EXAMPLES_ALARM_SIGNO=1
 # CONFIG_EXAMPLES_CHAT is not set
 # CONFIG_EXAMPLES_CONFIGDATA is not set
 # CONFIG_EXAMPLES_CPUHOG is not set
@@ -813,6 +832,7 @@ CONFIG_EXAMPLES_NSAMPLES=8
 # CONFIG_EXAMPLES_TIFF is not set
 # CONFIG_EXAMPLES_TOUCHSCREEN is not set
 # CONFIG_EXAMPLES_WEBSERVER is not set
+# CONFIG_EXAMPLES_USBSERIAL is not set
 # CONFIG_EXAMPLES_USBTERM is not set
 # CONFIG_EXAMPLES_WATCHDOG is not set
 
@@ -944,7 +964,7 @@ CONFIG_NSH_FILEIOSIZE=512
 #
 CONFIG_NSH_CONSOLE=y
 # CONFIG_NSH_ALTCONDEV is not set
-# CONFIG_NSH_ARCHINIT is not set
+CONFIG_NSH_ARCHINIT=y
 # CONFIG_NSH_LOGIN is not set
 # CONFIG_NSH_CONSOLE_LOGIN is not set
 

configs/nucleo-l476rg/src/nucleo-l476rg.h

@@ -52,7 +52,15 @@
  ************************************************************************************/
 /* Configuration ********************************************************************/
 
+#define HAVE_RTC_DRIVER       1
 #define HAVE_MMCSD 1
+
+/* Check if we can support the RTC driver */
+
+#if !defined(CONFIG_RTC) || !defined(CONFIG_RTC_DRIVER)
+#  undef HAVE_RTC_DRIVER
+#endif
+
 #if !defined(CONFIG_STM32_SDIO) || !defined(CONFIG_MMCSD) || \
     !defined(CONFIG_MMCSD_SDIO)
 #  undef HAVE_MMCSD

configs/nucleo-l476rg/src/stm32_appinit.c

@@ -55,6 +55,11 @@
 
 #include "nucleo-l476rg.h"
 
+#ifdef HAVE_RTC_DRIVER
+#  include <nuttx/timers/rtc.h>
+#  include "stm32l4_rtc.h"
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -83,9 +88,12 @@ void up_netinitialize(void)
 
 int board_app_initialize(void)
 {
-#if defined(HAVE_MMCSD) || defined(CONFIG_AJOYSTICK)
+#ifdef HAVE_RTC_DRIVER
-  int ret;
+  FAR struct rtc_lowerhalf_s *rtclower;
 #endif
+  int ret;
+
+  (void)ret;
 
   /* Configure CPU load estimation */
 
@@ -93,6 +101,30 @@ int board_app_initialize(void)
   cpuload_initialize_once();
 #endif
 
+#ifdef HAVE_RTC_DRIVER
+  /* Instantiate the STM32L4 lower-half RTC driver */
+
+  rtclower = stm32l4_rtc_lowerhalf();
+  if (!rtclower)
+    {
+      sdbg("ERROR: Failed to instantiate the RTC lower-half driver\n");
+      return -ENOMEM;
+    }
+  else
+    {
+      /* Bind the lower half driver and register the combined RTC driver
+       * as /dev/rtc0
+       */
+
+      ret = rtc_initialize(0, rtclower);
+      if (ret < 0)
+        {
+          sdbg("ERROR: Failed to bind/register the RTC driver: %d\n", ret);
+          return ret;
+        }
+    }
+#endif
+
 #ifdef HAVE_MMCSD
   /* First, get an instance of the SDIO interface */