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/* Copyright (c) 2009, 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:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 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. */
/* avr/signature.h - Signature API */
#ifndef _AVR_SIGNATURE_H_
#define _AVR_SIGNATURE_H_ 1
/** \file */
/** \defgroup avr_signature <avr/signature.h>: Signature Support
\par Introduction
The <avr/signature.h> header file allows the user to automatically
and easily include the device's signature data in a special section of
the final linked ELF file.
This value can then be used by programming software to compare the on-device
signature with the signature recorded in the ELF file to look for a match
before programming the device.
\par API Usage Example
Usage is very simple; just include the header file:
\code
#include <avr/signature.h>
\endcode
This will declare a constant unsigned char array and it is initialized with
the three signature bytes, MSB first, that are defined in the device I/O
header file. This array is then placed in the .signature section in the
resulting linked ELF file.
The three signature bytes that are used to initialize the array are
these defined macros in the device I/O header file, from MSB to LSB:
SIGNATURE_2, SIGNATURE_1, SIGNATURE_0.
This header file should only be included once in an application.
*/
#ifndef __ASSEMBLER__
#include <avr/io.h>
#if defined(SIGNATURE_0) && defined(SIGNATURE_1) && defined(SIGNATURE_2)
const unsigned char __signature[3] __attribute__((section (".signature"))) =
{ SIGNATURE_2, SIGNATURE_1, SIGNATURE_0 };
#endif /* defined(SIGNATURE_0) && defined(SIGNATURE_1) && defined(SIGNATURE_2) */
#endif /* __ASSEMBLER__ */
#endif /* _AVR_SIGNATURE_H_ */
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