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diff --git a/watch-library/shared/watch/watch_gpio.h b/watch-library/shared/watch/watch_gpio.h
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+/*
+ * 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.
+ */
+#ifndef _WATCH_GPIO_H_INCLUDED
+#define _WATCH_GPIO_H_INCLUDED
+////< @file watch_gpio.h
+
+#include "watch.h"
+
+/** @addtogroup gpio Digital Input and Output
+  * @brief This section covers functions related to general-purpose input and output signals.
+  */
+/// @{
+/** @brief Configures the selected pin for digital input.
+  * @param pin The pin that you wish to act as an input.
+  */
+void watch_enable_digital_input(const uint8_t pin);
+
+/** @brief Disables any digital input, along with any pull-up or pull-down configuration.
+  * @param pin The pin that you wish to disable.
+  */
+void watch_disable_digital_input(const uint8_t pin);
+
+/** @brief Enables a pull-up resistor on the selected pin.
+  * @param pin The pin that you wish to configure.
+  */
+void watch_enable_pull_up(const uint8_t pin);
+
+/** @brief Enables a pull-down resistor on the selected pin.
+  * @param pin The pin that you wish to configure.
+  */
+void watch_enable_pull_down(const uint8_t pin);
+
+/** @brief Gets the level of the selected pin.
+  * @param pin The pin whose value you wish to read.
+  * @return true if the pin was logic high; otherwise, false.
+  */
+bool watch_get_pin_level(const uint8_t pin);
+
+/** @brief Configures the selected pin for digital output.
+  * @param pin The pin that you wish to act as an output.
+  */
+void watch_enable_digital_output(const uint8_t pin);
+
+/** @brief Disables digital output on the selected pin.
+  * @param pin The pin that you wish disable.
+  */
+void watch_disable_digital_output(const uint8_t pin);
+
+/** @brief Sets the level of the selected pin.
+  * @param pin The pin whose value you wish to set.
+  * @param level The level you wish to set: true for high, false for low.
+  */
+void watch_set_pin_level(const uint8_t pin, const bool level);
+/// @}
+#endif