/**************************************************************************
 * arch/arm/src/kl/kl_lowgetc.c
 *
 *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form 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 NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 **************************************************************************/

/**************************************************************************
 * Included Files
 **************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>

#include <arch/irq.h>
#include <arch/board/board.h>

#include "up_internal.h"
#include "up_arch.h"

#include "kl_config.h"
#include "kl_lowgetc.h"

#include "chip/kl_uart.h"

/**************************************************************************
 * Private Definitions
 **************************************************************************/
/* Select UART parameters for the selected console */

#if defined(CONFIG_UART0_SERIAL_CONSOLE)
#  define CONSOLE_BASE     KL_UART0_BASE
#  define CONSOLE_FREQ     BOARD_CORECLK_FREQ
#  define CONSOLE_BAUD     CONFIG_UART0_BAUD
#  define CONSOLE_BITS     CONFIG_UART0_BITS
#  define CONSOLE_PARITY   CONFIG_UART0_PARITY
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
#  define CONSOLE_BASE     KL_UART1_BASE
#  define CONSOLE_FREQ     BOARD_BUSCLK_FREQ
#  define CONSOLE_BAUD     CONFIG_UART1_BAUD
#  define CONSOLE_BITS     CONFIG_UART1_BITS
#  define CONSOLE_PARITY   CONFIG_UART1_PARITY
#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
#  define CONSOLE_BASE     KL_UART2_BASE
#  define CONSOLE_FREQ     BOARD_BUSCLK_FREQ
#  define CONSOLE_BAUD     CONFIG_UART2_BAUD
#  define CONSOLE_BITS     CONFIG_UART2_BITS
#  define CONSOLE_PARITY   CONFIG_UART2_PARITY
#endif

/**************************************************************************
 * Private Types
 **************************************************************************/

/**************************************************************************
 * Private Function Prototypes
 **************************************************************************/

/**************************************************************************
 * Global Variables
 **************************************************************************/

/**************************************************************************
 * Private Variables
 **************************************************************************/

/**************************************************************************
 * Private Functions
 **************************************************************************/

/**************************************************************************
 * Public Functions
 **************************************************************************/

/**************************************************************************
 * Name: up_lowgetc
 *
 * Description:
 *   Input one byte from the serial console
 *
 **************************************************************************/

int kl_lowgetc(void)
{
  uint8_t ch = 0;

#if defined HAVE_UART_DEVICE && defined HAVE_SERIAL_CONSOLE
  /* Wait while the receiver data buffer is "empty" (RDRF) to assure that
   * we have data in the buffer to read.
   */

  while ((getreg8(CONSOLE_BASE+KL_UART_S1_OFFSET) & UART_S1_RDRF) == 0);

 /* Then read a character from the UART data register */

  ch = getreg8(CONSOLE_BASE+KL_UART_D_OFFSET);
#endif

  return (int)ch;
}