# HG changeset patch
# User Ethan Zonca <ez@ethanzonca.com>
# Date 2016-10-19 17:29:22
# Node ID ddbcfaffc98a20e39287c26d1349b65dfd9dbc29
# Parent  2fa25ca2db210b8f4eb9c85a39c25664e04f78fa

Hopefully set up the RTC and prepare for entering sleep mode for one minute at a time

diff --git a/inc/rtc.h b/inc/rtc.h
--- a/inc/rtc.h
+++ b/inc/rtc.h
@@ -1,7 +1,11 @@
 #ifndef __rtc_H
 #define __rtc_H
 
+#include "stm32f0xx_hal.h"
+
 
 void rtc_init(void);
+RTC_HandleTypeDef* rtc_gethandle(void);
+
 
 #endif /*__ rtc_H */
diff --git a/src/interrupts.c b/src/interrupts.c
--- a/src/interrupts.c
+++ b/src/interrupts.c
@@ -6,6 +6,7 @@
 #include "stm32f0xx.h"
 #include "interrupts.h"
 #include "uart.h"
+#include "rtc.h"
 #include "gpio.h"
 
 extern TIM_HandleTypeDef htim1;
@@ -33,3 +34,14 @@ void TIM1_BRK_UP_TRG_COM_IRQHandler(void
     proceed = 1;
     HAL_TIM_IRQHandler(&htim1);
 }
+
+void RTC_IRQHandler(void)
+{
+  HAL_RTC_AlarmIRQHandler(rtc_gethandle());
+}
+
+
+void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
+{
+	// Do something awesome or not
+}
diff --git a/src/main.c b/src/main.c
--- a/src/main.c
+++ b/src/main.c
@@ -17,6 +17,13 @@
 // Probabl wake up 1 minute early -- 0.45min possible +/- on wakeup time with 15min sync intervals
 
 
+// TODO: Add JT9 message with more grid locator digits + altitude + vbatt + temp
+// MSG13charmax:
+// 	X: gridloc
+//  Y: altitude
+//  Z: temperature
+//  KD8TDF XXYYZZ // could use alt callsign thing
+
 enum _state
 {
     SYSTEM_IDLE = 0, // awaiting RTC interrupt for wakeup TODO wake up before scheduled time to get fix?
@@ -98,17 +105,22 @@ int main(void)
             case SYSTEM_IDLE:
             {
                 blink_rate = BLINK_SLOW;
-                HAL_PWR_EnterSLEEPMode(0, PWR_SLEEPENTRY_WFI);
-                HAL_PWR_EnterSLEEPMode(0, PWR_SLEEPENTRY_WFI);
-                HAL_PWR_EnterSLEEPMode(0, PWR_SLEEPENTRY_WFI);
+
+                // Actually sleep for real: disable systick and sleep until RTC interrupt
+                HAL_SuspendTick();
+
+                // Enter sleep mode: wait for interrupt
                 HAL_PWR_EnterSLEEPMode(0, PWR_SLEEPENTRY_WFI);
 
-                // Wait for RTC wakeup interrupt
-                //wfi();
-                //enter_sleep();
+                // We have woken up!
+
+                // This is hopefully the only timer that needs to stay alive in idle mode
+                last_wspr_tx_time += 0; // move this timer forward based on sleep length
 
-                // Somehow go to another state when we get an interrupt
-//                state = SYSTEM_GPSACQ;
+                HAL_ResumeTick();
+
+                // TODO: Eventually use GPS time to calibrate the RTC maybe
+
             } break;
 
 
diff --git a/src/rtc.c b/src/rtc.c
--- a/src/rtc.c
+++ b/src/rtc.c
@@ -16,7 +16,7 @@ static void Error_Handler(void)
 // Initialize RTC
 void rtc_init(void)
 {
-        __HAL_RCC_RTC_ENABLE();
+	__HAL_RCC_RTC_ENABLE();
 
     
   RTC_TimeTypeDef sTime;
@@ -25,11 +25,12 @@ void rtc_init(void)
 
   hrtc.Instance = RTC;
   hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
-  hrtc.Init.AsynchPrediv = 127;
-  hrtc.Init.SynchPrediv = 255;
+  hrtc.Init.AsynchPrediv = 124;
+  hrtc.Init.SynchPrediv = 322; // if this has enough bits should be 1.0018Hz based on 40kHz LSI
   hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
   hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
   hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
+
   if (HAL_RTC_Init(&hrtc) != HAL_OK)
   {
     Error_Handler();
@@ -55,6 +56,7 @@ void rtc_init(void)
     Error_Handler();
   }
 
+
     /**Enable the Alarm A 
     */
   sAlarm.AlarmTime.Hours = 0x0;
@@ -63,7 +65,9 @@ void rtc_init(void)
   sAlarm.AlarmTime.SubSeconds = 0x0;
   sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
   sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
-  sAlarm.AlarmMask = RTC_ALARMMASK_NONE;
+
+  // Alarm will trigger on the Xth second of every minute
+  sAlarm.AlarmMask = RTC_ALARMMASK_DATEWEEKDAY | RTC_ALARMMASK_HOURS | RTC_ALARMMASK_MINUTES;
   sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
   sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
   sAlarm.AlarmDateWeekDay = 0x1;
@@ -73,4 +77,18 @@ void rtc_init(void)
     Error_Handler();
   }
 
+  HAL_NVIC_SetPriority(RTC_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(RTC_IRQn);
 }
+
+void rtc_cal(void)
+{
+	// Do something with hrtc.Instance->CALR; // this has a plus and minus component, see refman
+}
+
+RTC_HandleTypeDef* rtc_gethandle(void)
+{
+	return &hrtc;
+}
+
+