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<h1>lock.h</h1><a href="lock_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) 2007, Atmel Corporation</span>
<a name="l00002"></a>00002 <span class="comment"> All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment"> Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment"> modification, are permitted provided that the following conditions are met:</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment"> * Redistributions of source code must retain the above copyright</span>
<a name="l00008"></a>00008 <span class="comment"> notice, this list of conditions and the following disclaimer.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> * Redistributions in binary form must reproduce the above copyright</span>
<a name="l00011"></a>00011 <span class="comment"> notice, this list of conditions and the following disclaimer in</span>
<a name="l00012"></a>00012 <span class="comment"> the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment"> distribution.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment"> * Neither the name of the copyright holders nor the names of</span>
<a name="l00016"></a>00016 <span class="comment"> contributors may be used to endorse or promote products derived</span>
<a name="l00017"></a>00017 <span class="comment"> from this software without specific prior written permission.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot;</span>
<a name="l00020"></a>00020 <span class="comment"> AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00021"></a>00021 <span class="comment"> IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00022"></a>00022 <span class="comment"> ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE</span>
<a name="l00023"></a>00023 <span class="comment"> LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span>
<a name="l00024"></a>00024 <span class="comment"> CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>
<a name="l00025"></a>00025 <span class="comment"> SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
<a name="l00026"></a>00026 <span class="comment"> INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span>
<a name="l00027"></a>00027 <span class="comment"> CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
<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>
<a name="l00029"></a>00029 <span class="comment"> POSSIBILITY OF SUCH DAMAGE. */</span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="comment">/* $Id$ */</span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="comment">/* avr/lock.h - Lock Bits API */</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#ifndef _AVR_LOCK_H_</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#define _AVR_LOCK_H_ 1</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span>
<a name="l00038"></a>00038 <span class="comment"></span>
<a name="l00039"></a>00039 <span class="comment">/** \file */</span><span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment">/** \defgroup avr_lock &lt;avr/lock.h&gt;: Lockbit Support</span>
<a name="l00041"></a>00041 <span class="comment"></span>
<a name="l00042"></a>00042 <span class="comment"> \par Introduction</span>
<a name="l00043"></a>00043 <span class="comment"></span>
<a name="l00044"></a>00044 <span class="comment"> The Lockbit API allows a user to specify the lockbit settings for the </span>
<a name="l00045"></a>00045 <span class="comment"> specific AVR device they are compiling for. These lockbit settings will be </span>
<a name="l00046"></a>00046 <span class="comment"> placed in a special section in the ELF output file, after linking.</span>
<a name="l00047"></a>00047 <span class="comment"></span>
<a name="l00048"></a>00048 <span class="comment"> Programming tools can take advantage of the lockbit information embedded in</span>
<a name="l00049"></a>00049 <span class="comment"> the ELF file, by extracting this information and determining if the lockbits</span>
<a name="l00050"></a>00050 <span class="comment"> need to be programmed after programming the Flash and EEPROM memories.</span>
<a name="l00051"></a>00051 <span class="comment"> This also allows a single ELF file to contain all the</span>
<a name="l00052"></a>00052 <span class="comment"> information needed to program an AVR. </span>
<a name="l00053"></a>00053 <span class="comment"></span>
<a name="l00054"></a>00054 <span class="comment"> To use the Lockbit API, include the &lt;avr/io.h&gt; header file, which in turn</span>
<a name="l00055"></a>00055 <span class="comment"> automatically includes the individual I/O header file and the &lt;avr/lock.h&gt;</span>
<a name="l00056"></a>00056 <span class="comment"> file. These other two files provides everything necessary to set the AVR</span>
<a name="l00057"></a>00057 <span class="comment"> lockbits.</span>
<a name="l00058"></a>00058 <span class="comment"> </span>
<a name="l00059"></a>00059 <span class="comment"> \par Lockbit API</span>
<a name="l00060"></a>00060 <span class="comment"> </span>
<a name="l00061"></a>00061 <span class="comment"> Each I/O header file may define up to 3 macros that controls what kinds</span>
<a name="l00062"></a>00062 <span class="comment"> of lockbits are available to the user.</span>
<a name="l00063"></a>00063 <span class="comment"> </span>
<a name="l00064"></a>00064 <span class="comment"> If __LOCK_BITS_EXIST is defined, then two lock bits are available to the</span>
<a name="l00065"></a>00065 <span class="comment"> user and 3 mode settings are defined for these two bits.</span>
<a name="l00066"></a>00066 <span class="comment"> </span>
<a name="l00067"></a>00067 <span class="comment"> If __BOOT_LOCK_BITS_0_EXIST is defined, then the two BLB0 lock bits are</span>
<a name="l00068"></a>00068 <span class="comment"> available to the user and 4 mode settings are defined for these two bits.</span>
<a name="l00069"></a>00069 <span class="comment"> </span>
<a name="l00070"></a>00070 <span class="comment"> If __BOOT_LOCK_BITS_1_EXIST is defined, then the two BLB1 lock bits are</span>
<a name="l00071"></a>00071 <span class="comment"> available to the user and 4 mode settings are defined for these two bits.</span>
<a name="l00072"></a>00072 <span class="comment"></span>
<a name="l00073"></a>00073 <span class="comment"> If __BOOT_LOCK_APPLICATION_TABLE_BITS_EXIST is defined then two lock bits</span>
<a name="l00074"></a>00074 <span class="comment"> are available to set the locking mode for the Application Table Section </span>
<a name="l00075"></a>00075 <span class="comment"> (which is used in the XMEGA family).</span>
<a name="l00076"></a>00076 <span class="comment"> </span>
<a name="l00077"></a>00077 <span class="comment"> If __BOOT_LOCK_APPLICATION_BITS_EXIST is defined then two lock bits are</span>
<a name="l00078"></a>00078 <span class="comment"> available to set the locking mode for the Application Section (which is used</span>
<a name="l00079"></a>00079 <span class="comment"> in the XMEGA family).</span>
<a name="l00080"></a>00080 <span class="comment"> </span>
<a name="l00081"></a>00081 <span class="comment"> If __BOOT_LOCK_BOOT_BITS_EXIST is defined then two lock bits are available</span>
<a name="l00082"></a>00082 <span class="comment"> to set the locking mode for the Boot Loader Section (which is used in the</span>
<a name="l00083"></a>00083 <span class="comment"> XMEGA family).</span>
<a name="l00084"></a>00084 <span class="comment"></span>
<a name="l00085"></a>00085 <span class="comment"> The AVR lockbit modes have inverted values, logical 1 for an unprogrammed </span>
<a name="l00086"></a>00086 <span class="comment"> (disabled) bit and logical 0 for a programmed (enabled) bit. The defined </span>
<a name="l00087"></a>00087 <span class="comment"> macros for each individual lock bit represent this in their definition by a </span>
<a name="l00088"></a>00088 <span class="comment"> bit-wise inversion of a mask. For example, the LB_MODE_3 macro is defined </span>
<a name="l00089"></a>00089 <span class="comment"> as:</span>
<a name="l00090"></a>00090 <span class="comment"> \code</span>
<a name="l00091"></a>00091 <span class="comment"> #define LB_MODE_3 (0xFC)</span>
<a name="l00092"></a>00092 <span class="comment">` \endcode</span>
<a name="l00093"></a>00093 <span class="comment"> </span>
<a name="l00094"></a>00094 <span class="comment"> To combine the lockbit mode macros together to represent a whole byte,</span>
<a name="l00095"></a>00095 <span class="comment"> use the bitwise AND operator, like so:</span>
<a name="l00096"></a>00096 <span class="comment"> \code</span>
<a name="l00097"></a>00097 <span class="comment"> (LB_MODE_3 &amp; BLB0_MODE_2)</span>
<a name="l00098"></a>00098 <span class="comment"> \endcode</span>
<a name="l00099"></a>00099 <span class="comment"> </span>
<a name="l00100"></a>00100 <span class="comment"> &lt;avr/lock.h&gt; also defines a macro that provides a default lockbit value:</span>
<a name="l00101"></a>00101 <span class="comment"> LOCKBITS_DEFAULT which is defined to be 0xFF.</span>
<a name="l00102"></a>00102 <span class="comment"></span>
<a name="l00103"></a>00103 <span class="comment"> See the AVR device specific datasheet for more details about these</span>
<a name="l00104"></a>00104 <span class="comment"> lock bits and the available mode settings.</span>
<a name="l00105"></a>00105 <span class="comment"> </span>
<a name="l00106"></a>00106 <span class="comment"> A convenience macro, LOCKMEM, is defined as a GCC attribute for a </span>
<a name="l00107"></a>00107 <span class="comment"> custom-named section of &quot;.lock&quot;.</span>
<a name="l00108"></a>00108 <span class="comment"> </span>
<a name="l00109"></a>00109 <span class="comment"> A convenience macro, LOCKBITS, is defined that declares a variable, __lock, </span>
<a name="l00110"></a>00110 <span class="comment"> of type unsigned char with the attribute defined by LOCKMEM. This variable</span>
<a name="l00111"></a>00111 <span class="comment"> allows the end user to easily set the lockbit data.</span>
<a name="l00112"></a>00112 <span class="comment"></span>
<a name="l00113"></a>00113 <span class="comment"> \note If a device-specific I/O header file has previously defined LOCKMEM,</span>
<a name="l00114"></a>00114 <span class="comment"> then LOCKMEM is not redefined. If a device-specific I/O header file has</span>
<a name="l00115"></a>00115 <span class="comment"> previously defined LOCKBITS, then LOCKBITS is not redefined. LOCKBITS is</span>
<a name="l00116"></a>00116 <span class="comment"> currently known to be defined in the I/O header files for the XMEGA devices.</span>
<a name="l00117"></a>00117 <span class="comment"></span>
<a name="l00118"></a>00118 <span class="comment"> \par API Usage Example</span>
<a name="l00119"></a>00119 <span class="comment"> </span>
<a name="l00120"></a>00120 <span class="comment"> Putting all of this together is easy:</span>
<a name="l00121"></a>00121 <span class="comment"> </span>
<a name="l00122"></a>00122 <span class="comment"> \code</span>
<a name="l00123"></a>00123 <span class="comment"> #include &lt;avr/io.h&gt;</span>
<a name="l00124"></a>00124 <span class="comment"></span>
<a name="l00125"></a>00125 <span class="comment"> LOCKBITS = (LB_MODE_1 &amp; BLB0_MODE_3 &amp; BLB1_MODE_4);</span>
<a name="l00126"></a>00126 <span class="comment"></span>
<a name="l00127"></a>00127 <span class="comment"> int main(void)</span>
<a name="l00128"></a>00128 <span class="comment"> {</span>
<a name="l00129"></a>00129 <span class="comment"> return 0;</span>
<a name="l00130"></a>00130 <span class="comment"> }</span>
<a name="l00131"></a>00131 <span class="comment"> \endcode</span>
<a name="l00132"></a>00132 <span class="comment"> </span>
<a name="l00133"></a>00133 <span class="comment"> Or:</span>
<a name="l00134"></a>00134 <span class="comment"> </span>
<a name="l00135"></a>00135 <span class="comment"> \code</span>
<a name="l00136"></a>00136 <span class="comment"> #include &lt;avr/io.h&gt;</span>
<a name="l00137"></a>00137 <span class="comment"></span>
<a name="l00138"></a>00138 <span class="comment"> unsigned char __lock __attribute__((section (&quot;.lock&quot;))) = </span>
<a name="l00139"></a>00139 <span class="comment"> (LB_MODE_1 &amp; BLB0_MODE_3 &amp; BLB1_MODE_4);</span>
<a name="l00140"></a>00140 <span class="comment"></span>
<a name="l00141"></a>00141 <span class="comment"> int main(void)</span>
<a name="l00142"></a>00142 <span class="comment"> {</span>
<a name="l00143"></a>00143 <span class="comment"> return 0;</span>
<a name="l00144"></a>00144 <span class="comment"> }</span>
<a name="l00145"></a>00145 <span class="comment"> \endcode</span>
<a name="l00146"></a>00146 <span class="comment"> </span>
<a name="l00147"></a>00147 <span class="comment"> </span>
<a name="l00148"></a>00148 <span class="comment"> </span>
<a name="l00149"></a>00149 <span class="comment"> However there are a number of caveats that you need to be aware of to</span>
<a name="l00150"></a>00150 <span class="comment"> use this API properly.</span>
<a name="l00151"></a>00151 <span class="comment"> </span>
<a name="l00152"></a>00152 <span class="comment"> Be sure to include &lt;avr/io.h&gt; to get all of the definitions for the API.</span>
<a name="l00153"></a>00153 <span class="comment"> The LOCKBITS macro defines a global variable to store the lockbit data. This </span>
<a name="l00154"></a>00154 <span class="comment"> variable is assigned to its own linker section. Assign the desired lockbit </span>
<a name="l00155"></a>00155 <span class="comment"> values immediately in the variable initialization.</span>
<a name="l00156"></a>00156 <span class="comment"> </span>
<a name="l00157"></a>00157 <span class="comment"> The .lock section in the ELF file will get its values from the initial </span>
<a name="l00158"></a>00158 <span class="comment"> variable assignment ONLY. This means that you can NOT assign values to </span>
<a name="l00159"></a>00159 <span class="comment"> this variable in functions and the new values will not be put into the</span>
<a name="l00160"></a>00160 <span class="comment"> ELF .lock section.</span>
<a name="l00161"></a>00161 <span class="comment"> </span>
<a name="l00162"></a>00162 <span class="comment"> The global variable is declared in the LOCKBITS macro has two leading </span>
<a name="l00163"></a>00163 <span class="comment"> underscores, which means that it is reserved for the &quot;implementation&quot;,</span>
<a name="l00164"></a>00164 <span class="comment"> meaning the library, so it will not conflict with a user-named variable.</span>
<a name="l00165"></a>00165 <span class="comment"> </span>
<a name="l00166"></a>00166 <span class="comment"> You must initialize the lockbit variable to some meaningful value, even</span>
<a name="l00167"></a>00167 <span class="comment"> if it is the default value. This is because the lockbits default to a </span>
<a name="l00168"></a>00168 <span class="comment"> logical 1, meaning unprogrammed. Normal uninitialized data defaults to all </span>
<a name="l00169"></a>00169 <span class="comment"> locgial zeros. So it is vital that all lockbits are initialized, even with </span>
<a name="l00170"></a>00170 <span class="comment"> default data. If they are not, then the lockbits may not programmed to the </span>
<a name="l00171"></a>00171 <span class="comment"> desired settings and can possibly put your device into an unrecoverable </span>
<a name="l00172"></a>00172 <span class="comment"> state.</span>
<a name="l00173"></a>00173 <span class="comment"> </span>
<a name="l00174"></a>00174 <span class="comment"> Be sure to have the -mmcu=&lt;em&gt;device&lt;/em&gt; flag in your compile command line and</span>
<a name="l00175"></a>00175 <span class="comment"> your linker command line to have the correct device selected and to have </span>
<a name="l00176"></a>00176 <span class="comment"> the correct I/O header file included when you include &lt;avr/io.h&gt;.</span>
<a name="l00177"></a>00177 <span class="comment"></span>
<a name="l00178"></a>00178 <span class="comment"> You can print out the contents of the .lock section in the ELF file by</span>
<a name="l00179"></a>00179 <span class="comment"> using this command line:</span>
<a name="l00180"></a>00180 <span class="comment"> \code</span>
<a name="l00181"></a>00181 <span class="comment"> avr-objdump -s -j .lock &lt;ELF file&gt;</span>
<a name="l00182"></a>00182 <span class="comment"> \endcode</span>
<a name="l00183"></a>00183 <span class="comment"></span>
<a name="l00184"></a>00184 <span class="comment">*/</span>
<a name="l00185"></a>00185
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="preprocessor">#if !(defined(__ASSEMBLER__) || defined(__DOXYGEN__))</span>
<a name="l00188"></a>00188 <span class="preprocessor"></span>
<a name="l00189"></a>00189 <span class="preprocessor">#ifndef LOCKMEM</span>
<a name="l00190"></a>00190 <span class="preprocessor"></span><span class="preprocessor">#define LOCKMEM __attribute__((__used__, __section__ (&quot;.lock&quot;)))</span>
<a name="l00191"></a>00191 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00192"></a>00192 <span class="preprocessor"></span>
<a name="l00193"></a>00193 <span class="preprocessor">#ifndef LOCKBITS</span>
<a name="l00194"></a>00194 <span class="preprocessor"></span><span class="preprocessor">#define LOCKBITS unsigned char __lock LOCKMEM</span>
<a name="l00195"></a>00195 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00196"></a>00196 <span class="preprocessor"></span>
<a name="l00197"></a>00197 <span class="comment">/* Lock Bit Modes */</span>
<a name="l00198"></a>00198 <span class="preprocessor">#if defined(__LOCK_BITS_EXIST)</span>
<a name="l00199"></a>00199 <span class="preprocessor"></span><span class="preprocessor">#define LB_MODE_1 (0xFF)</span>
<a name="l00200"></a>00200 <span class="preprocessor"></span><span class="preprocessor">#define LB_MODE_2 (0xFE)</span>
<a name="l00201"></a>00201 <span class="preprocessor"></span><span class="preprocessor">#define LB_MODE_3 (0xFC)</span>
<a name="l00202"></a>00202 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00203"></a>00203 <span class="preprocessor"></span>
<a name="l00204"></a>00204 <span class="preprocessor">#if defined(__BOOT_LOCK_BITS_0_EXIST)</span>
<a name="l00205"></a>00205 <span class="preprocessor"></span><span class="preprocessor">#define BLB0_MODE_1 (0xFF)</span>
<a name="l00206"></a>00206 <span class="preprocessor"></span><span class="preprocessor">#define BLB0_MODE_2 (0xFB)</span>
<a name="l00207"></a>00207 <span class="preprocessor"></span><span class="preprocessor">#define BLB0_MODE_3 (0xF3)</span>
<a name="l00208"></a>00208 <span class="preprocessor"></span><span class="preprocessor">#define BLB0_MODE_4 (0xF7)</span>
<a name="l00209"></a>00209 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00210"></a>00210 <span class="preprocessor"></span>
<a name="l00211"></a>00211 <span class="preprocessor">#if defined(__BOOT_LOCK_BITS_1_EXIST)</span>
<a name="l00212"></a>00212 <span class="preprocessor"></span><span class="preprocessor">#define BLB1_MODE_1 (0xFF)</span>
<a name="l00213"></a>00213 <span class="preprocessor"></span><span class="preprocessor">#define BLB1_MODE_2 (0xEF)</span>
<a name="l00214"></a>00214 <span class="preprocessor"></span><span class="preprocessor">#define BLB1_MODE_3 (0xCF)</span>
<a name="l00215"></a>00215 <span class="preprocessor"></span><span class="preprocessor">#define BLB1_MODE_4 (0xDF)</span>
<a name="l00216"></a>00216 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00217"></a>00217 <span class="preprocessor"></span>
<a name="l00218"></a>00218 <span class="preprocessor">#if defined(__BOOT_LOCK_APPLICATION_TABLE_BITS_EXIST)</span>
<a name="l00219"></a>00219 <span class="preprocessor"></span><span class="preprocessor">#define BLBAT0 ~_BV(2)</span>
<a name="l00220"></a>00220 <span class="preprocessor"></span><span class="preprocessor">#define BLBAT1 ~_BV(3)</span>
<a name="l00221"></a>00221 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00222"></a>00222 <span class="preprocessor"></span>
<a name="l00223"></a>00223 <span class="preprocessor">#if defined(__BOOT_LOCK_APPLICATION_BITS_EXIST)</span>
<a name="l00224"></a>00224 <span class="preprocessor"></span><span class="preprocessor">#define BLBA0 ~_BV(4)</span>
<a name="l00225"></a>00225 <span class="preprocessor"></span><span class="preprocessor">#define BLBA1 ~_BV(5)</span>
<a name="l00226"></a>00226 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00227"></a>00227 <span class="preprocessor"></span>
<a name="l00228"></a>00228 <span class="preprocessor">#if defined(__BOOT_LOCK_BOOT_BITS_EXIST)</span>
<a name="l00229"></a>00229 <span class="preprocessor"></span><span class="preprocessor">#define BLBB0 ~_BV(6)</span>
<a name="l00230"></a>00230 <span class="preprocessor"></span><span class="preprocessor">#define BLBB1 ~_BV(7)</span>
<a name="l00231"></a>00231 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00232"></a>00232 <span class="preprocessor"></span>
<a name="l00233"></a>00233
<a name="l00234"></a>00234 <span class="preprocessor">#define LOCKBITS_DEFAULT (0xFF)</span>
<a name="l00235"></a>00235 <span class="preprocessor"></span>
<a name="l00236"></a>00236 <span class="preprocessor">#endif </span><span class="comment">/* !(__ASSEMBLER || __DOXYGEN__) */</span>
<a name="l00237"></a>00237
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="preprocessor">#endif </span><span class="comment">/* _AVR_LOCK_H_ */</span>
</pre></div></div>
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