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<h1>signature.h</h1><a href="signature_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009, Atmel Corporation</span>
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<a name="l00002"></a>00002 <span class="comment"> All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment"></span>
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<a name="l00004"></a>00004 <span class="comment"> Redistribution and use in source and binary forms, with or without</span>
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<a name="l00005"></a>00005 <span class="comment"> modification, are permitted provided that the following conditions are met:</span>
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<a name="l00006"></a>00006 <span class="comment"></span>
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<a name="l00007"></a>00007 <span class="comment"> * Redistributions of source code must retain the above copyright</span>
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<a name="l00008"></a>00008 <span class="comment"> notice, this list of conditions and the following disclaimer.</span>
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<a name="l00009"></a>00009 <span class="comment"></span>
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<a name="l00010"></a>00010 <span class="comment"> * Redistributions in binary form must reproduce the above copyright</span>
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<a name="l00011"></a>00011 <span class="comment"> notice, this list of conditions and the following disclaimer in</span>
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<a name="l00012"></a>00012 <span class="comment"> the documentation and/or other materials provided with the</span>
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<a name="l00013"></a>00013 <span class="comment"> distribution.</span>
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<a name="l00014"></a>00014 <span class="comment"></span>
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<a name="l00015"></a>00015 <span class="comment"> * Neither the name of the copyright holders nor the names of</span>
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<a name="l00016"></a>00016 <span class="comment"> contributors may be used to endorse or promote products derived</span>
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<a name="l00017"></a>00017 <span class="comment"> from this software without specific prior written permission.</span>
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<a name="l00018"></a>00018 <span class="comment"></span>
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<a name="l00019"></a>00019 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"</span>
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<a name="l00020"></a>00020 <span class="comment"> AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
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<a name="l00021"></a>00021 <span class="comment"> IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
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<a name="l00022"></a>00022 <span class="comment"> ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE</span>
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<a name="l00023"></a>00023 <span class="comment"> LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span>
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<a name="l00024"></a>00024 <span class="comment"> CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>
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<a name="l00025"></a>00025 <span class="comment"> SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
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<a name="l00026"></a>00026 <span class="comment"> INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span>
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<a name="l00027"></a>00027 <span class="comment"> CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
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<a name="l00028"></a>00028 <span class="comment"> ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span>
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<a name="l00029"></a>00029 <span class="comment"> POSSIBILITY OF SUCH DAMAGE. */</span>
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<a name="l00030"></a>00030
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<a name="l00031"></a>00031 <span class="comment">/* $Id$ */</span>
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<a name="l00032"></a>00032
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<a name="l00033"></a>00033 <span class="comment">/* avr/signature.h - Signature API */</span>
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<a name="l00034"></a>00034
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<a name="l00035"></a>00035 <span class="preprocessor">#ifndef _AVR_SIGNATURE_H_</span>
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<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#define _AVR_SIGNATURE_H_ 1</span>
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<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="comment"></span>
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<a name="l00038"></a>00038 <span class="comment">/** \file */</span><span class="comment"></span>
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<a name="l00039"></a>00039 <span class="comment">/** \defgroup avr_signature <avr/signature.h>: Signature Support</span>
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<a name="l00040"></a>00040 <span class="comment"></span>
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<a name="l00041"></a>00041 <span class="comment"> \par Introduction</span>
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<a name="l00042"></a>00042 <span class="comment"></span>
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<a name="l00043"></a>00043 <span class="comment"> The <avr/signature.h> header file allows the user to automatically</span>
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<a name="l00044"></a>00044 <span class="comment"> and easily include the device's signature data in a special section of</span>
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<a name="l00045"></a>00045 <span class="comment"> the final linked ELF file.</span>
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<a name="l00046"></a>00046 <span class="comment"> </span>
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<a name="l00047"></a>00047 <span class="comment"> This value can then be used by programming software to compare the on-device</span>
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<a name="l00048"></a>00048 <span class="comment"> signature with the signature recorded in the ELF file to look for a match</span>
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<a name="l00049"></a>00049 <span class="comment"> before programming the device.</span>
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<a name="l00050"></a>00050 <span class="comment"> </span>
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<a name="l00051"></a>00051 <span class="comment"> \par API Usage Example</span>
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<a name="l00052"></a>00052 <span class="comment"></span>
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<a name="l00053"></a>00053 <span class="comment"> Usage is very simple; just include the header file:</span>
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<a name="l00054"></a>00054 <span class="comment"> </span>
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<a name="l00055"></a>00055 <span class="comment"> \code</span>
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<a name="l00056"></a>00056 <span class="comment"> #include <avr/signature.h></span>
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<a name="l00057"></a>00057 <span class="comment"> \endcode</span>
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<a name="l00058"></a>00058 <span class="comment"> </span>
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<a name="l00059"></a>00059 <span class="comment"> This will declare a constant unsigned char array and it is initialized with</span>
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<a name="l00060"></a>00060 <span class="comment"> the three signature bytes, MSB first, that are defined in the device I/O</span>
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<a name="l00061"></a>00061 <span class="comment"> header file. This array is then placed in the .signature section in the</span>
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<a name="l00062"></a>00062 <span class="comment"> resulting linked ELF file.</span>
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<a name="l00063"></a>00063 <span class="comment"> </span>
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<a name="l00064"></a>00064 <span class="comment"> The three signature bytes that are used to initialize the array are </span>
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<a name="l00065"></a>00065 <span class="comment"> these defined macros in the device I/O header file, from MSB to LSB:</span>
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<a name="l00066"></a>00066 <span class="comment"> SIGNATURE_2, SIGNATURE_1, SIGNATURE_0.</span>
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<a name="l00067"></a>00067 <span class="comment"> </span>
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<a name="l00068"></a>00068 <span class="comment"> This header file should only be included once in an application.</span>
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<a name="l00069"></a>00069 <span class="comment">*/</span>
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<a name="l00070"></a>00070
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<a name="l00071"></a>00071 <span class="preprocessor">#ifndef __ASSEMBLER__</span>
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<a name="l00072"></a>00072 <span class="preprocessor"></span>
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<a name="l00073"></a>00073 <span class="preprocessor">#include <<a class="code" href="io_8h.html">avr/io.h</a>></span>
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<a name="l00074"></a>00074
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<a name="l00075"></a>00075 <span class="preprocessor">#if defined(SIGNATURE_0) && defined(SIGNATURE_1) && defined(SIGNATURE_2)</span>
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<a name="l00076"></a>00076 <span class="preprocessor"></span>
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<a name="l00077"></a>00077 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> __signature[3]
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<a name="l00078"></a>00078 <a class="code" href="group__avr__watchdog.html#gadaa6dd28b5d08df35e49b1248d7e5fb0">__attribute__</a>((__used__, __section__(<span class="stringliteral">".signature"</span>))) =
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<a name="l00079"></a>00079 { SIGNATURE_2, SIGNATURE_1, SIGNATURE_0 };
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<a name="l00080"></a>00080
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<a name="l00081"></a>00081 <span class="preprocessor">#endif </span><span class="comment">/* defined(SIGNATURE_0) && defined(SIGNATURE_1) && defined(SIGNATURE_2) */</span>
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<a name="l00082"></a>00082
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<a name="l00083"></a>00083 <span class="preprocessor">#endif </span><span class="comment">/* __ASSEMBLER__ */</span>
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<a name="l00084"></a>00084
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<a name="l00085"></a>00085 <span class="preprocessor">#endif </span><span class="comment">/* _AVR_SIGNATURE_H_ */</span>
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</pre></div></div>
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