115 lines
4.3 KiB
C
115 lines
4.3 KiB
C
/****************************************************************************
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* arch/arm/src/imx/imx_lowputc.h
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_IMX6_IMX_LOWPUTC_H
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#define __ARCH_ARM_SRC_IMX6_IMX_LOWPUTC_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "up_internal.h"
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#include "chip.h"
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifdef IMX_HAVE_UART
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/* This structure describes the configuration of an UART */
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struct uart_config_s
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{
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uint32_t baud; /* Configured baud */
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uint8_t parity; /* 0=none, 1=odd, 2=even */
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uint8_t bits; /* Number of bits (5-9) */
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bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
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};
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: imx_lowsetup
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*
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* Description:
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* Called at the very beginning of _start. Performs low level
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* initialization including setup of the console UART. This UART done
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* early so that the serial console is available for debugging very early
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* in the boot sequence.
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*
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****************************************************************************/
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void imx_lowsetup(void);
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/************************************************************************************
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* Name: imx_uart_configure
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*
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* Description:
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* Configure a UART for non-interrupt driven operation
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*
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************************************************************************************/
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#ifdef IMX_HAVE_UART
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int imx_uart_configure(uint32_t base, FAR const struct uart_config_s *config);
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#endif
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/************************************************************************************
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* Name: imx_lowputc
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*
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* Description:
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* Output a byte with as few system dependencies as possible. This will even work
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* BEFORE the console is initialized if we are booting from U-Boot (and the same
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* UART is used for the console, of course.)
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*
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************************************************************************************/
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#if defined(IMX_HAVE_UART) && defined(CONFIG_DEBUG_FEATURES)
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void imx_lowputc(int ch);
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#else
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# define imx_lowputc(ch)
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#endif
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#endif /* __ARCH_ARM_SRC_IMX6_IMX_LOWPUTC_H */
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