00001 /*This file is prepared for Doxygen automatic documentation generation.*/ 00016 /* Copyright (c) 2009 Atmel Corporation. All rights reserved. 00017 * 00018 * Redistribution and use in source and binary forms, with or without 00019 * modification, are permitted provided that the following conditions are met: 00020 * 00021 * 1. Redistributions of source code must retain the above copyright notice, this 00022 * list of conditions and the following disclaimer. 00023 * 00024 * 2. Redistributions in binary form must reproduce the above copyright notice, 00025 * this list of conditions and the following disclaimer in the documentation 00026 * and/or other materials provided with the distribution. 00027 * 00028 * 3. The name of Atmel may not be used to endorse or promote products derived 00029 * from this software without specific prior written permission. 00030 * 00031 * 4. This software may only be redistributed and used in connection with an Atmel 00032 * AVR product. 00033 * 00034 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED 00035 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00036 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE 00037 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR 00038 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00039 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00040 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00041 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00042 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00043 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE 00044 * 00045 */ 00046 00047 #include <yfuns.h> 00048 #include <avr32/io.h> 00049 #include "usart.h" 00050 00051 00052 _STD_BEGIN 00053 00054 00055 #pragma module_name = "?__read" 00056 00057 00058 extern volatile avr32_usart_t *volatile stdio_usart_base; 00059 00060 00071 size_t __read(int handle, unsigned char *buffer, size_t size) 00072 { 00073 int nChars = 0; 00074 00075 // This implementation only reads from stdin. 00076 // For all other file handles, it returns failure. 00077 if (handle != _LLIO_STDIN) 00078 { 00079 return _LLIO_ERROR; 00080 } 00081 00082 for (; size > 0; --size) 00083 { 00084 int c = usart_getchar(stdio_usart_base); 00085 if (c < 0) 00086 break; 00087 00088 *buffer++ = c; 00089 ++nChars; 00090 } 00091 00092 return nChars; 00093 } 00094 00095 00096 _STD_END