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 /*This file is prepared for Doxygen automatic documentation generation.*/ /*! \file ********************************************************************* * * \brief System-specific implementation of the \ref __write 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 = "?__write" //! Pointer to the base of the USART module instance to use for stdio. __no_init volatile avr32_usart_t *volatile stdio_usart_base; /*! \brief Writes a number of bytes, at most \a size, from the memory area * pointed to by \a buffer. * * If \a buffer is zero then \ref __write performs flushing of internal buffers, * if any. In this case, \a handle can be \c -1 to indicate that all handles * should be flushed. * * \param handle File handle to write to. * \param buffer Pointer to buffer to read bytes to write from. * \param size Number of bytes to write. * * \return The number of bytes written, or \c _LLIO_ERROR on failure. */ size_t __write(int handle, const uint8_t *buffer, size_t size) { size_t nChars = 0; if (buffer == 0) { // This means that we should flush internal buffers. return 0; } // This implementation only writes to stdout and stderr. // For all other file handles, it returns failure. if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR) { return _LLIO_ERROR; } for (; size != 0; --size) { if (usart_putchar(stdio_usart_base, *buffer++) < 0) { return _LLIO_ERROR; } ++nChars; } return nChars; } _STD_END