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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 __read 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 = "?__read"
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extern volatile avr32_usart_t *volatile stdio_usart_base;
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/*! \brief Reads a number of bytes, at most \a size, into the memory area
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* pointed to by \a buffer.
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*
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* \param handle File handle to read from.
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* \param buffer Pointer to buffer to write read bytes to.
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* \param size Number of bytes to read.
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*
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* \return The number of bytes read, \c 0 at the end of the file, or
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* \c _LLIO_ERROR on failure.
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*/
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size_t __read(int handle, unsigned char *buffer, size_t size)
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{
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int nChars = 0;
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// This implementation only reads from stdin.
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// For all other file handles, it returns failure.
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if (handle != _LLIO_STDIN)
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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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int c = usart_getchar(stdio_usart_base);
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if (c < 0)
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break;
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*buffer++ = c;
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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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