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/**************************************************************************
* 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;
}
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