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diff --git a/watch-library/shared/watch/watch_private.h b/watch-library/shared/watch/watch_private.h
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+++ b/watch-library/shared/watch/watch_private.h
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+/*
+ * MIT License
+ *
+ * Copyright (c) 2021 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.
+ */
+#ifndef _WATCH_PRIVATE_H_INCLUDED
+#define _WATCH_PRIVATE_H_INCLUDED
+
+#include "watch.h"
+
+/// Called by main.c while setting up the app. You should not call this from your app.
+void _watch_init(void);
+
+/// Initializes the real-time clock peripheral.
+void _watch_rtc_init(void);
+
+/// Called by buzzer and LED setup functions. You should not call this from your app.
+void _watch_enable_tcc(void);
+
+/// Called by buzzer and LED teardown functions. You should not call this from your app.
+void _watch_disable_tcc(void);
+
+/// Called by main.c if plugged in to USB. You should not call this from your app.
+void _watch_enable_usb(void);
+
+// this function ends up getting called by printf to log stuff to the USB console.
+int _write(int file, char *ptr, int len);
+
+// this method could be overridden to read stuff from the USB console? but no need rn.
+int _read(void);
+
+#endif