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diff --git a/watch-library/hal/include/hpl_usart.h b/watch-library/hal/include/hpl_usart.h
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+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USART_H_INCLUDED
+#define _HPL_USART_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART SYNC
+ *
+ * \section hpl_usart_sync_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART flow control state
+ */
+union usart_flow_control_state {
+	struct {
+		uint8_t cts : 1;
+		uint8_t rts : 1;
+		uint8_t unavailable : 1;
+		uint8_t reserved : 5;
+	} bit;
+	uint8_t value;
+};
+
+/**
+ * \brief USART baud rate mode
+ */
+enum usart_baud_rate_mode { USART_BAUDRATE_ASYNCH_ARITHMETIC, USART_BAUDRATE_ASYNCH_FRACTIONAL, USART_BAUDRATE_SYNCH };
+
+/**
+ * \brief USART data order
+ */
+enum usart_data_order { USART_DATA_ORDER_MSB = 0, USART_DATA_ORDER_LSB = 1 };
+
+/**
+ * \brief USART mode
+ */
+enum usart_mode { USART_MODE_ASYNCHRONOUS = 0, USART_MODE_SYNCHRONOUS = 1 };
+
+/**
+ * \brief USART parity
+ */
+enum usart_parity {
+	USART_PARITY_EVEN  = 0,
+	USART_PARITY_ODD   = 1,
+	USART_PARITY_NONE  = 2,
+	USART_PARITY_SPACE = 3,
+	USART_PARITY_MARK  = 4
+};
+
+/**
+ * \brief USART stop bits mode
+ */
+enum usart_stop_bits { USART_STOP_BITS_ONE = 0, USART_STOP_BITS_TWO = 1, USART_STOP_BITS_ONE_P_FIVE = 2 };
+
+/**
+ * \brief USART character size
+ */
+enum usart_character_size {
+	USART_CHARACTER_SIZE_8BITS = 0,
+	USART_CHARACTER_SIZE_9BITS = 1,
+	USART_CHARACTER_SIZE_5BITS = 5,
+	USART_CHARACTER_SIZE_6BITS = 6,
+	USART_CHARACTER_SIZE_7BITS = 7
+};
+
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_USART_H_INCLUDED */