1 /** 2 * \file 3 * 4 * \brief System-specific implementation of the \ref _read function used by 5 * the standard library. 6 * 7 * Copyright (c) 2009-2015 Atmel Corporation. All rights reserved. 8 * 9 * \asf_license_start 10 * 11 * \page License 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright notice, 17 * this list of conditions and the following disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above copyright notice, 20 * this list of conditions and the following disclaimer in the documentation 21 * and/or other materials provided with the distribution. 22 * 23 * 3. The name of Atmel may not be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * 4. This software may only be redistributed and used in connection with an 27 * Atmel microcontroller product. 28 * 29 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED 30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE 32 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR 33 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 38 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 39 * POSSIBILITY OF SUCH DAMAGE. 40 * 41 * \asf_license_stop 42 * 43 */ 44 /* 45 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> 46 */ 47 48 #include "compiler.h" 49 50 /** 51 * \defgroup group_common_utils_stdio Standard I/O (stdio) 52 * 53 * Common standard I/O driver that implements the stdio 54 * read and write functions on AVR and SAM devices. 55 * 56 * \{ 57 */ 58 59 extern volatile void *volatile stdio_base; 60 void (*ptr_get)(void volatile*, char*); 61 62 63 // IAR common implementation 64 #if ( defined(__ICCAVR32__) || defined(__ICCAVR__) || defined(__ICCARM__) ) 65 66 #include <yfuns.h> 67 68 _STD_BEGIN 69 70 #pragma module_name = "?__read" 71 72 /*! \brief Reads a number of bytes, at most \a size, into the memory area 73 * pointed to by \a buffer. 74 * 75 * \param handle File handle to read from. 76 * \param buffer Pointer to buffer to write read bytes to. 77 * \param size Number of bytes to read. 78 * 79 * \return The number of bytes read, \c 0 at the end of the file, or 80 * \c _LLIO_ERROR on failure. 81 */ 82 size_t __read(int handle, unsigned char *buffer, size_t size) 83 { 84 int nChars = 0; 85 // This implementation only reads from stdin. 86 // For all other file handles, it returns failure. 87 if (handle != _LLIO_STDIN) { 88 return _LLIO_ERROR; 89 } 90 for (; size > 0; --size) { 91 ptr_get(stdio_base, (char*)buffer); 92 buffer++; 93 nChars++; 94 } 95 return nChars; 96 } 97 98 /*! \brief This routine is required by IAR DLIB library since EWAVR V6.10 99 * the implementation is empty to be compatible with old IAR version. 100 */ 101 int __close(int handle) 102 { 103 UNUSED(handle); 104 return 0; 105 } 106 107 /*! \brief This routine is required by IAR DLIB library since EWAVR V6.10 108 * the implementation is empty to be compatible with old IAR version. 109 */ 110 int remove(const char* val) 111 { 112 UNUSED(val); 113 return 0; 114 } 115 116 /*! \brief This routine is required by IAR DLIB library since EWAVR V6.10 117 * the implementation is empty to be compatible with old IAR version. 118 */ 119 long __lseek(int handle, long val, int val2) 120 { 121 UNUSED(handle); 122 UNUSED(val2); 123 return val; 124 } 125 126 _STD_END 127 128 // GCC AVR32 and SAM implementation 129 #elif (defined(__GNUC__) && !XMEGA && !MEGA) 130 131 int __attribute__((weak)) 132 _read (int file, char * ptr, int len); // Remove GCC compiler warning 133 134 int __attribute__((weak)) 135 _read (int file, char * ptr, int len) 136 { 137 int nChars = 0; 138 139 if (file != 0) { 140 return -1; 141 } 142 143 for (; len > 0; --len) { 144 ptr_get(stdio_base, ptr); 145 ptr++; 146 nChars++; 147 } 148 return nChars; 149 } 150 151 // GCC AVR implementation 152 #elif (defined(__GNUC__) && (XMEGA || MEGA) ) 153 154 int _read (int *f); // Remove GCC compiler warning 155 156 int _read (int *f) 157 { 158 char c; 159 ptr_get(stdio_base,&c); 160 return c; 161 } 162 #endif 163 164 /** 165 * \} 166 */ 167 168