/****************************************************************************
 * arch/arm/src/samd/sam_lowputc.h
 *
 *   Copyright (C) 2014 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.
 *
 ****************************************************************************/

#ifndef __ARCH_ARM_SRC_SAMD_SAM_LOWPUTC_H
#define __ARCH_ARM_SRC_SAMD_SAM_LOWPUTC_H

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

#include <nuttx/config.h>
#include "sam_config.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Public Types
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

#ifndef __ASSEMBLY__

#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: sam_lowsetup
 *
 * Description:
 *   Called at the very beginning of _start.  Performs low level
 *   initialization.
 *
 ****************************************************************************/

void sam_lowsetup(void);

/****************************************************************************
 * Name: sam_usart_initialize
 *
 * Description:
 *   Set the configuration of a SERCOM for provided USART configuration.
 *   This configures the SERCOM as a USART, but does not configure USART
 *   interrupts or enable the USART.
 *
 ****************************************************************************/

#ifdef SAMD_HAVE_USART
struct sam_usart_config_s;
int sam_usart_initialize(const struct sam_usart_config_s * const config);
#endif

/****************************************************************************
 * Name: sam_usart_reset
 *
 * Description:
 *   Reset the USART SERCOM.  This restores all SERCOM register to the
 *   initial state and disables the SERCOM.
 *
 ****************************************************************************/

#ifdef SAMD_HAVE_USART
struct sam_usart_config_s;
void sam_usart_reset(const struct sam_usart_config_s * const config);
#endif

/****************************************************************************
 * Name: sam_lowputc
 *
 * Description:
 *   Output one character to the USART using a simple polling method.
 *
 ****************************************************************************/

#ifdef HAVE_SERIAL_CONSOLE
void sam_lowputc(uint32_t ch);
#endif

#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_SAMD_SAM_LOWPUTC_H */