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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [IAR/] [AVR32_UC3/] [write.c] - Blame information for rev 820

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1 572 jeremybenn
/*This file is prepared for Doxygen automatic documentation generation.*/
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/*! \file *********************************************************************
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 *
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 * \brief System-specific implementation of the \ref __write function used by
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          the standard library.
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 *
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 * - Compiler:           IAR EWAVR32
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 * - Supported devices:  All AVR32 devices with a USART module can be used.
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 * - AppNote:
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 *
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 * \author               Atmel Corporation: http://www.atmel.com \n
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 *                       Support and FAQ: http://support.atmel.no/
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 *
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 ******************************************************************************/
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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
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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 are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 * this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 * this list of conditions and the following disclaimer in the documentation
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 * and/or other materials provided with the distribution.
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 *
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 * 3. The name of ATMEL may not be used to endorse or promote products derived
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 * from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
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 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
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 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <yfuns.h>
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#include <avr32/io.h>
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#include "usart.h"
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_STD_BEGIN
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#pragma module_name = "?__write"
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//! Pointer to the base of the USART module instance to use for stdio.
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__no_init volatile avr32_usart_t *volatile stdio_usart_base;
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/*! \brief Writes a number of bytes, at most \a size, from the memory area
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 *         pointed to by \a buffer.
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 *
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 * If \a buffer is zero then \ref __write performs flushing of internal buffers,
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 * if any. In this case, \a handle can be \c -1 to indicate that all handles
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 * should be flushed.
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 *
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 * \param handle File handle to write to.
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 * \param buffer Pointer to buffer to read bytes to write from.
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 * \param size Number of bytes to write.
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 *
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 * \return The number of bytes written, or \c _LLIO_ERROR on failure.
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 */
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size_t __write(int handle, const unsigned char *buffer, size_t size)
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{
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  size_t nChars = 0;
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  if (buffer == 0)
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  {
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    // This means that we should flush internal buffers.
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    return 0;
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  }
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  // This implementation only writes to stdout and stderr.
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  // For all other file handles, it returns failure.
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  if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR)
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  {
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    return _LLIO_ERROR;
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  }
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  for (; size != 0; --size)
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  {
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    if (usart_putchar(stdio_usart_base, *buffer++) < 0)
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    {
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      return _LLIO_ERROR;
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    }
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    ++nChars;
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  }
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  return nChars;
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}
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_STD_END

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