rt-thread-official/bsp/samd21/sam_d2x_asflib/sam0/utils/stdio/read.c

157 lines
4.0 KiB
C

/**
* \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(__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 implementation
#elif (defined(__GNUC__))
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;
}
#endif
/**
* \}
*/