/** | |
* \file | |
* | |
* \brief System-specific implementation of the \ref _read function used by | |
* the standard library. | |
* | |
* Copyright (c) 2009-2015 Atmel Corporation. All rights reserved. | |
* | |
* \asf_license_start | |
* | |
* \page License | |
* | |
* 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. | |
* | |
* 4. This software may only be redistributed and used in connection with an | |
* Atmel microcontroller product. | |
* | |
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED | |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 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. | |
* | |
* \asf_license_stop | |
* | |
*/ | |
/* | |
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> | |
*/ | |
#include "compiler.h" | |
/** | |
* \defgroup group_common_utils_stdio Standard I/O (stdio) | |
* | |
* Common standard I/O driver that implements the stdio | |
* read and write functions on AVR and SAM devices. | |
* | |
* \{ | |
*/ | |
extern volatile void *volatile stdio_base; | |
void (*ptr_get)(void volatile*, char*); | |
// IAR common implementation | |
#if ( defined(__ICCAVR32__) || defined(__ICCAVR__) || defined(__ICCARM__) ) | |
#include <yfuns.h> | |
_STD_BEGIN | |
#pragma module_name = "?__read" | |
/*! \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, unsigned char *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) { | |
ptr_get(stdio_base, (char*)buffer); | |
buffer++; | |
nChars++; | |
} | |
return nChars; | |
} | |
/*! \brief This routine is required by IAR DLIB library since EWAVR V6.10 | |
* the implementation is empty to be compatible with old IAR version. | |
*/ | |
int __close(int handle) | |
{ | |
UNUSED(handle); | |
return 0; | |
} | |
/*! \brief This routine is required by IAR DLIB library since EWAVR V6.10 | |
* the implementation is empty to be compatible with old IAR version. | |
*/ | |
int remove(const char* val) | |
{ | |
UNUSED(val); | |
return 0; | |
} | |
/*! \brief This routine is required by IAR DLIB library since EWAVR V6.10 | |
* the implementation is empty to be compatible with old IAR version. | |
*/ | |
long __lseek(int handle, long val, int val2) | |
{ | |
UNUSED(handle); | |
UNUSED(val2); | |
return val; | |
} | |
_STD_END | |
// GCC AVR32 and SAM implementation | |
#elif (defined(__GNUC__) && !XMEGA && !MEGA) | |
int __attribute__((weak)) | |
_read (int file, char * ptr, int len); // Remove GCC compiler warning | |
int __attribute__((weak)) | |
_read (int file, char * ptr, int len) | |
{ | |
int nChars = 0; | |
if (file != 0) { | |
return -1; | |
} | |
for (; len > 0; --len) { | |
ptr_get(stdio_base, ptr); | |
ptr++; | |
nChars++; | |
} | |
return nChars; | |
} | |
// GCC AVR implementation | |
#elif (defined(__GNUC__) && (XMEGA || MEGA) ) | |
int _read (int *f); // Remove GCC compiler warning | |
int _read (int *f) | |
{ | |
char c; | |
ptr_get(stdio_base,&c); | |
return c; | |
} | |
#endif | |
/** | |
* \} | |
*/ | |