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 * are permitted provided that the following conditions are met:
 *
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 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
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 */

#ifndef SERIAL_UART_H__
#define SERIAL_UART_H__

#include <stdint.h>
#include "nrf_mesh_serial.h"

/**
 * @defgroup SERIAL_UART Serial UART bearer
 * @ingroup MESH_SERIAL
 * @{
 */

/**
 * Serial UART RX callback type.
 * Called upon reception of a byte on the UART interface.
 *
 * @param[in] byte The received byte on the UART interface.
 */
typedef void (*serial_uart_rx_cb_t)(uint8_t byte);

/**
 * Serial UART TX callback type.
 * Called after each successful transfer.
 */
typedef void (*serial_uart_tx_cb_t)(void);

/**
 * Initializes the serial interface.
 *
 * @param[in] rx_cb The receive callback.
 * @param[in] tx_cb The transmit callback.
 *
 * @retval NRF_SUCCESS    The UART is successfully initialized.
 * @retval NRF_ERROR_NULL None of the parameters can be an invalid pointer.
 */
uint32_t serial_uart_init(serial_uart_rx_cb_t rx_cb, serial_uart_tx_cb_t tx_cb);

/**
 * Sends and receives any pending data on the UART line if possible.
 */
void serial_uart_process(void);

/**
 * Enable/disable reception of data from the peer device.
 *
 * @param[in] enable_rx Set to @c true in order to enable the reception of data form peer.
 */
void serial_uart_receive_set(bool enable_rx);

/** Starts a transfer. */
static inline void serial_uart_tx_start(void)
{
    NRF_UART0->EVENTS_TXDRDY = 0;
    NRF_UART0->TASKS_STARTTX = 1;
}

/** Stops a transfer. */
static inline void serial_uart_tx_stop(void)
{
    NRF_UART0->TASKS_STOPTX = 1;
}

/** Sets the next byte to send. */
static inline void serial_uart_byte_send(uint8_t value)
{
    NRF_UART0->TXD = value;
}

/** @} end of SERIAL_UART */

#endif
