nuttx/arch/arm/src/imx6/imx_lowputc.h
2016-06-11 14:14:08 -06:00

115 lines
4.3 KiB
C

/****************************************************************************
* arch/arm/src/imx/imx_lowputc.h
*
* Copyright (C) 2016 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_IMX6_IMX_LOWPUTC_H
#define __ARCH_ARM_SRC_IMX6_IMX_LOWPUTC_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include "up_internal.h"
#include "chip.h"
/****************************************************************************
* Public Types
****************************************************************************/
#ifdef IMX_HAVE_UART
/* This structure describes the configuration of an UART */
struct uart_config_s
{
uint32_t baud; /* Configured baud */
uint8_t parity; /* 0=none, 1=odd, 2=even */
uint8_t bits; /* Number of bits (5-9) */
bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
};
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: imx_lowsetup
*
* Description:
* Called at the very beginning of _start. Performs low level
* initialization including setup of the console UART. This UART done
* early so that the serial console is available for debugging very early
* in the boot sequence.
*
****************************************************************************/
void imx_lowsetup(void);
/************************************************************************************
* Name: imx_uart_configure
*
* Description:
* Configure a UART for non-interrupt driven operation
*
************************************************************************************/
#ifdef IMX_HAVE_UART
int imx_uart_configure(uint32_t base, FAR const struct uart_config_s *config);
#endif
/************************************************************************************
* Name: imx_lowputc
*
* Description:
* Output a byte with as few system dependencies as possible. This will even work
* BEFORE the console is initialized if we are booting from U-Boot (and the same
* UART is used for the console, of course.)
*
************************************************************************************/
#if defined(IMX_HAVE_UART) && defined(CONFIG_DEBUG_FEATURES)
void imx_lowputc(int ch);
#else
# define imx_lowputc(ch)
#endif
#endif /* __ARCH_ARM_SRC_IMX6_IMX_LOWPUTC_H */