refactor: break out different areas of functionality

watch-library/watch/watch_rtc.h

@@ -0,0 +1,58 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+////< @file watch_rtc.h
+
+#include "hpl_calendar.h"
+
+/** @addtogroup rtc Real-Time Clock
+  * @brief This section covers functions related to the SAM L22's real-time clock peripheral, including
+  *        date, time and alarm functions.
+  * @details The real-time clock is the only peripheral that main.c enables for you. It is the cornerstone
+  *          of low power operation on the watch, and it is required for several key functions that we
+  *          assume will be available, namely the wake from BACKUP mode and the callback on the ALARM button.
+  *          It is also required for the operation of the 1 Hz tick interrupt, which you will most likely use
+  *          to wake from STANDBY mode.
+  */
+/// @{
+/** @brief Called by main.c to check if the RTC is enabled.
+  * You may call this function, but outside of app_init, it sbould always return true.
+  */
+bool _watch_rtc_is_enabled();
+
+/** @brief Sets the system date and time.
+  * @param date_time A struct representing the date and time you wish to set.
+  */
+void watch_set_date_time(struct calendar_date_time date_time);
+
+/** @brief Returns the system date and time in the provided struct.
+  * @param date_time A pointer to a calendar_date_time struct.
+                     It will be populated with the correct date and time on return.
+  */
+void watch_get_date_time(struct calendar_date_time *date_time);
+
+/** @brief Registers a "tick" callback that will be called once per second.
+  * @param callback The function you wish to have called when the clock ticks.
+  */
+void watch_register_tick_callback(ext_irq_cb_t callback);
+/// @}