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 /*This file is prepared for Doxygen automatic documentation generation.*/ /*! \file ********************************************************************* * * \brief System-specific implementation of the \ref __read function used by the standard library. * * - Compiler: IAR EWAVR32 * - Supported devices: All AVR32 devices with a USART module can be used. * - AppNote: * * \author Atmel Corporation (Now Microchip): * https://www.microchip.com \n * Support and FAQ: https://www.microchip.com/support/ * ******************************************************************************/ /* Copyright (c) 2007, Atmel Corporation All rights reserved. * * 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. The name of ATMEL may not be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY ATMEL 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 EXPRESSLY AND * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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. */ #include #include #include "usart.h" _STD_BEGIN #pragma module_name = "?__read" extern volatile avr32_usart_t *volatile stdio_usart_base; /*! \brief Reads a number of bytes, at most \a size, into the memory area * pointed to by \a buffer. * * \param handle File handle to read from. * \param buffer Pointer to buffer to write read bytes to. * \param size Number of bytes to read. * * \return The number of bytes read, \c 0 at the end of the file, or * \c _LLIO_ERROR on failure. */ size_t __read(int handle, uint8_t *buffer, size_t size) { int nChars = 0; // This implementation only reads from stdin. // For all other file handles, it returns failure. if (handle != _LLIO_STDIN) { return _LLIO_ERROR; } for (; size > 0; --size) { int c = usart_getchar(stdio_usart_base); if (c < 0) break; *buffer++ = c; ++nChars; } return nChars; } _STD_END