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<h1>wdt.h</h1> </div>
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<a href="wdt_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) 2002, 2004 Marek Michalkiewicz</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (c) 2005, 2006, 2007 Eric B. Weddington</span>
<a name="l00003"></a>00003 <span class="comment"> All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> modification, are permitted provided that the following conditions are met:</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment"> notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment"> * Redistributions in binary form must reproduce the above copyright</span>
<a name="l00012"></a>00012 <span class="comment"> notice, this list of conditions and the following disclaimer in</span>
<a name="l00013"></a>00013 <span class="comment"> the documentation and/or other materials provided with the</span>
<a name="l00014"></a>00014 <span class="comment"> distribution.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> * Neither the name of the copyright holders nor the names of</span>
<a name="l00017"></a>00017 <span class="comment"> contributors may be used to endorse or promote products derived</span>
<a name="l00018"></a>00018 <span class="comment"> from this software without specific prior written permission.</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"</span>
<a name="l00021"></a>00021 <span class="comment"> AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00022"></a>00022 <span class="comment"> IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00023"></a>00023 <span class="comment"> ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE</span>
<a name="l00024"></a>00024 <span class="comment"> LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span>
<a name="l00025"></a>00025 <span class="comment"> CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>
<a name="l00026"></a>00026 <span class="comment"> SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
<a name="l00027"></a>00027 <span class="comment"> INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span>
<a name="l00028"></a>00028 <span class="comment"> CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
<a name="l00029"></a>00029 <span class="comment"> ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span>
<a name="l00030"></a>00030 <span class="comment"> POSSIBILITY OF SUCH DAMAGE. */</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">/* $Id: wdt.h 2211 2011-02-14 14:04:25Z aboyapati $ */</span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">/*</span>
<a name="l00035"></a>00035 <span class="comment"> avr/wdt.h - macros for AVR watchdog timer</span>
<a name="l00036"></a>00036 <span class="comment"> */</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="preprocessor">#ifndef _AVR_WDT_H_</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span><span class="preprocessor">#define _AVR_WDT_H_</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a>00041 <span class="preprocessor">#include <<a class="code" href="io_8h.html">avr/io.h</a>></span>
<a name="l00042"></a>00042 <span class="preprocessor">#include <<a class="code" href="stdint_8h.html">stdint.h</a>></span>
<a name="l00043"></a>00043 <span class="comment"></span>
<a name="l00044"></a>00044 <span class="comment">/** \file */</span><span class="comment"></span>
<a name="l00045"></a>00045 <span class="comment">/** \defgroup avr_watchdog <avr/wdt.h>: Watchdog timer handling</span>
<a name="l00046"></a>00046 <span class="comment"> \code #include <avr/wdt.h> \endcode</span>
<a name="l00047"></a>00047 <span class="comment"></span>
<a name="l00048"></a>00048 <span class="comment"> This header file declares the interface to some inline macros</span>
<a name="l00049"></a>00049 <span class="comment"> handling the watchdog timer present in many AVR devices. In order</span>
<a name="l00050"></a>00050 <span class="comment"> to prevent the watchdog timer configuration from being</span>
<a name="l00051"></a>00051 <span class="comment"> accidentally altered by a crashing application, a special timed</span>
<a name="l00052"></a>00052 <span class="comment"> sequence is required in order to change it. The macros within</span>
<a name="l00053"></a>00053 <span class="comment"> this header file handle the required sequence automatically</span>
<a name="l00054"></a>00054 <span class="comment"> before changing any value. Interrupts will be disabled during</span>
<a name="l00055"></a>00055 <span class="comment"> the manipulation.</span>
<a name="l00056"></a>00056 <span class="comment"></span>
<a name="l00057"></a>00057 <span class="comment"> \note Depending on the fuse configuration of the particular</span>
<a name="l00058"></a>00058 <span class="comment"> device, further restrictions might apply, in particular it might</span>
<a name="l00059"></a>00059 <span class="comment"> be disallowed to turn off the watchdog timer.</span>
<a name="l00060"></a>00060 <span class="comment"></span>
<a name="l00061"></a>00061 <span class="comment"> Note that for newer devices (ATmega88 and newer, effectively any</span>
<a name="l00062"></a>00062 <span class="comment"> AVR that has the option to also generate interrupts), the watchdog</span>
<a name="l00063"></a>00063 <span class="comment"> timer remains active even after a system reset (except a power-on</span>
<a name="l00064"></a>00064 <span class="comment"> condition), using the fastest prescaler value (approximately 15</span>
<a name="l00065"></a>00065 <span class="comment"> ms). It is therefore required to turn off the watchdog early</span>
<a name="l00066"></a>00066 <span class="comment"> during program startup, the datasheet recommends a sequence like</span>
<a name="l00067"></a>00067 <span class="comment"> the following:</span>
<a name="l00068"></a>00068 <span class="comment"></span>
<a name="l00069"></a>00069 <span class="comment"> \code</span>
<a name="l00070"></a>00070 <span class="comment"> #include <stdint.h></span>
<a name="l00071"></a>00071 <span class="comment"> #include <avr/wdt.h></span>
<a name="l00072"></a>00072 <span class="comment"></span>
<a name="l00073"></a>00073 <span class="comment"> uint8_t mcusr_mirror __attribute__ ((section (".noinit")));</span>
<a name="l00074"></a>00074 <span class="comment"></span>
<a name="l00075"></a>00075 <span class="comment"> void get_mcusr(void) \</span>
<a name="l00076"></a>00076 <span class="comment"> __attribute__((naked)) \</span>
<a name="l00077"></a>00077 <span class="comment"> __attribute__((section(".init3")));</span>
<a name="l00078"></a>00078 <span class="comment"> void get_mcusr(void)</span>
<a name="l00079"></a>00079 <span class="comment"> {</span>
<a name="l00080"></a>00080 <span class="comment"> mcusr_mirror = MCUSR;</span>
<a name="l00081"></a>00081 <span class="comment"> MCUSR = 0;</span>
<a name="l00082"></a>00082 <span class="comment"> wdt_disable();</span>
<a name="l00083"></a>00083 <span class="comment"> }</span>
<a name="l00084"></a>00084 <span class="comment"> \endcode</span>
<a name="l00085"></a>00085 <span class="comment"></span>
<a name="l00086"></a>00086 <span class="comment"> Saving the value of MCUSR in \c mcusr_mirror is only needed if the</span>
<a name="l00087"></a>00087 <span class="comment"> application later wants to examine the reset source, but in particular, </span>
<a name="l00088"></a>00088 <span class="comment"> clearing the watchdog reset flag before disabling the</span>
<a name="l00089"></a>00089 <span class="comment"> watchdog is required, according to the datasheet.</span>
<a name="l00090"></a>00090 <span class="comment">*/</span>
<a name="l00091"></a>00091 <span class="comment"></span>
<a name="l00092"></a>00092 <span class="comment">/**</span>
<a name="l00093"></a>00093 <span class="comment"> \ingroup avr_watchdog</span>
<a name="l00094"></a>00094 <span class="comment"> Reset the watchdog timer. When the watchdog timer is enabled,</span>
<a name="l00095"></a>00095 <span class="comment"> a call to this instruction is required before the timer expires,</span>
<a name="l00096"></a>00096 <span class="comment"> otherwise a watchdog-initiated device reset will occur. </span>
<a name="l00097"></a>00097 <span class="comment">*/</span>
<a name="l00098"></a>00098
<a name="l00099"></a><a class="code" href="group__avr__watchdog.html#ga9e52c54d10b6a6a7ce04aaaa4abea51f">00099</a> <span class="preprocessor">#define wdt_reset() __asm__ __volatile__ ("wdr")</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span>
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="preprocessor">#if defined(WDP3)</span>
<a name="l00103"></a>00103 <span class="preprocessor"></span><span class="preprocessor"># define _WD_PS3_MASK _BV(WDP3)</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00105"></a>00105 <span class="preprocessor"></span><span class="preprocessor"># define _WD_PS3_MASK 0x00</span>
<a name="l00106"></a>00106 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00107"></a>00107 <span class="preprocessor"></span>
<a name="l00108"></a>00108 <span class="preprocessor">#if defined(WDTCSR)</span>
<a name="l00109"></a>00109 <span class="preprocessor"></span><span class="preprocessor"># define _WD_CONTROL_REG WDTCSR</span>
<a name="l00110"></a>00110 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00111"></a>00111 <span class="preprocessor"></span><span class="preprocessor"># define _WD_CONTROL_REG WDTCR</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00113"></a>00113 <span class="preprocessor"></span>
<a name="l00114"></a>00114 <span class="preprocessor">#if defined(WDTOE)</span>
<a name="l00115"></a>00115 <span class="preprocessor"></span><span class="preprocessor">#define _WD_CHANGE_BIT WDTOE</span>
<a name="l00116"></a>00116 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00117"></a>00117 <span class="preprocessor"></span><span class="preprocessor">#define _WD_CHANGE_BIT WDCE</span>
<a name="l00118"></a>00118 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00119"></a>00119 <span class="preprocessor"></span>
<a name="l00120"></a>00120 <span class="comment"></span>
<a name="l00121"></a>00121 <span class="comment">/**</span>
<a name="l00122"></a>00122 <span class="comment"> \ingroup avr_watchdog</span>
<a name="l00123"></a>00123 <span class="comment"> Enable the watchdog timer, configuring it for expiry after</span>
<a name="l00124"></a>00124 <span class="comment"> \c timeout (which is a combination of the \c WDP0 through</span>
<a name="l00125"></a>00125 <span class="comment"> \c WDP2 bits to write into the \c WDTCR register; For those devices </span>
<a name="l00126"></a>00126 <span class="comment"> that have a \c WDTCSR register, it uses the combination of the \c WDP0 </span>
<a name="l00127"></a>00127 <span class="comment"> through \c WDP3 bits).</span>
<a name="l00128"></a>00128 <span class="comment"></span>
<a name="l00129"></a>00129 <span class="comment"> See also the symbolic constants \c WDTO_15MS et al.</span>
<a name="l00130"></a>00130 <span class="comment">*/</span>
<a name="l00131"></a>00131
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="preprocessor">#if defined(__AVR_ATxmega16A4__) \</span>
<a name="l00134"></a>00134 <span class="preprocessor">|| defined(__AVR_ATxmega16D4__) \</span>
<a name="l00135"></a>00135 <span class="preprocessor">|| defined(__AVR_ATxmega32A4__) \</span>
<a name="l00136"></a>00136 <span class="preprocessor">|| defined(__AVR_ATxmega32D4__) \</span>
<a name="l00137"></a>00137 <span class="preprocessor">|| defined(__AVR_ATxmega64A1U__) \</span>
<a name="l00138"></a>00138 <span class="preprocessor">|| defined(__AVR_ATxmega64A3__) \</span>
<a name="l00139"></a>00139 <span class="preprocessor">|| defined(__AVR_ATxmega64D3__) \</span>
<a name="l00140"></a>00140 <span class="preprocessor">|| defined(__AVR_ATxmega128A1__) \</span>
<a name="l00141"></a>00141 <span class="preprocessor">|| defined(__AVR_ATxmega128A1U__) \</span>
<a name="l00142"></a>00142 <span class="preprocessor">|| defined(__AVR_ATxmega128A3__) \</span>
<a name="l00143"></a>00143 <span class="preprocessor">|| defined(__AVR_ATxmega128D3__) \</span>
<a name="l00144"></a>00144 <span class="preprocessor">|| defined(__AVR_ATxmega192A3__) \</span>
<a name="l00145"></a>00145 <span class="preprocessor">|| defined(__AVR_ATxmega192D3__) \</span>
<a name="l00146"></a>00146 <span class="preprocessor">|| defined(__AVR_ATxmega256A3__) \</span>
<a name="l00147"></a>00147 <span class="preprocessor">|| defined(__AVR_ATxmega256D3__) \</span>
<a name="l00148"></a>00148 <span class="preprocessor">|| defined(__AVR_ATxmega256A3B__)</span>
<a name="l00149"></a>00149 <span class="preprocessor"></span>
<a name="l00150"></a>00150 <span class="comment">/*</span>
<a name="l00151"></a>00151 <span class="comment"> wdt_enable(WDT_PER_8KCLK_gc);</span>
<a name="l00152"></a>00152 <span class="comment">*/</span>
<a name="l00153"></a>00153 <span class="preprocessor">#define wdt_enable(value) \</span>
<a name="l00154"></a>00154 <span class="preprocessor">__asm__ __volatile__ ( \</span>
<a name="l00155"></a>00155 <span class="preprocessor"> "in __tmp_reg__, %0" "\n\t" \</span>
<a name="l00156"></a>00156 <span class="preprocessor"> "out %1, %3" "\n\t" \</span>
<a name="l00157"></a>00157 <span class="preprocessor"> "sts %2, %4" "\n\t" \</span>
<a name="l00158"></a>00158 <span class="preprocessor"> "wdr" "\n\t" \</span>
<a name="l00159"></a>00159 <span class="preprocessor"> "out %0, __tmp_reg__" "\n\t" \</span>
<a name="l00160"></a>00160 <span class="preprocessor"> : \</span>
<a name="l00161"></a>00161 <span class="preprocessor"> : "M" (_SFR_MEM_ADDR(RAMPD)), \</span>
<a name="l00162"></a>00162 <span class="preprocessor"> "M" (_SFR_MEM_ADDR(CCP)), \</span>
<a name="l00163"></a>00163 <span class="preprocessor"> "M" (_SFR_MEM_ADDR(WDT_CTRL)), \</span>
<a name="l00164"></a>00164 <span class="preprocessor"> "r" ((uint8_t)0xD8), \</span>
<a name="l00165"></a>00165 <span class="preprocessor"> "r" ((uint8_t)(WDT_CEN_bm | WDT_ENABLE_bm | value)) \</span>
<a name="l00166"></a>00166 <span class="preprocessor"> : "r0" \</span>
<a name="l00167"></a>00167 <span class="preprocessor">)</span>
<a name="l00168"></a>00168 <span class="preprocessor"></span>
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="preprocessor">#elif defined(__AVR_AT90CAN32__) \</span>
<a name="l00171"></a>00171 <span class="preprocessor">|| defined(__AVR_AT90CAN64__) \</span>
<a name="l00172"></a>00172 <span class="preprocessor">|| defined(__AVR_AT90CAN128__) \</span>
<a name="l00173"></a>00173 <span class="preprocessor">|| defined(__AVR_AT90PWM1__) \</span>
<a name="l00174"></a>00174 <span class="preprocessor">|| defined(__AVR_AT90PWM2__) \</span>
<a name="l00175"></a>00175 <span class="preprocessor">|| defined(__AVR_AT90PWM216__) \</span>
<a name="l00176"></a>00176 <span class="preprocessor">|| defined(__AVR_AT90PWM2B__) \</span>
<a name="l00177"></a>00177 <span class="preprocessor">|| defined(__AVR_AT90PWM3__) \</span>
<a name="l00178"></a>00178 <span class="preprocessor">|| defined(__AVR_AT90PWM316__) \</span>
<a name="l00179"></a>00179 <span class="preprocessor">|| defined(__AVR_AT90PWM3B__) \</span>
<a name="l00180"></a>00180 <span class="preprocessor">|| defined(__AVR_AT90PWM81__) \</span>
<a name="l00181"></a>00181 <span class="preprocessor">|| defined(__AVR_AT90USB1286__) \</span>
<a name="l00182"></a>00182 <span class="preprocessor">|| defined(__AVR_AT90USB1287__) \</span>
<a name="l00183"></a>00183 <span class="preprocessor">|| defined(__AVR_AT90USB162__) \</span>
<a name="l00184"></a>00184 <span class="preprocessor">|| defined(__AVR_AT90USB646__) \</span>
<a name="l00185"></a>00185 <span class="preprocessor">|| defined(__AVR_AT90USB647__) \</span>
<a name="l00186"></a>00186 <span class="preprocessor">|| defined(__AVR_AT90USB82__) \</span>
<a name="l00187"></a>00187 <span class="preprocessor">|| defined(__AVR_ATmega1280__) \</span>
<a name="l00188"></a>00188 <span class="preprocessor">|| defined(__AVR_ATmega1281__) \</span>
<a name="l00189"></a>00189 <span class="preprocessor">|| defined(__AVR_ATmega1284P__) \</span>
<a name="l00190"></a>00190 <span class="preprocessor">|| defined(__AVR_ATmega128RFA1__) \</span>
<a name="l00191"></a>00191 <span class="preprocessor">|| defined(__AVR_ATmega164__) \</span>
<a name="l00192"></a>00192 <span class="preprocessor">|| defined(__AVR_ATmega164A__) \</span>
<a name="l00193"></a>00193 <span class="preprocessor">|| defined(__AVR_ATmega164P__) \</span>
<a name="l00194"></a>00194 <span class="preprocessor">|| defined(__AVR_ATmega165__) \</span>
<a name="l00195"></a>00195 <span class="preprocessor">|| defined(__AVR_ATmega165A__) \</span>
<a name="l00196"></a>00196 <span class="preprocessor">|| defined(__AVR_ATmega165P__) \</span>
<a name="l00197"></a>00197 <span class="preprocessor">|| defined(__AVR_ATmega168__) \</span>
<a name="l00198"></a>00198 <span class="preprocessor">|| defined(__AVR_ATmega168A__) \</span>
<a name="l00199"></a>00199 <span class="preprocessor">|| defined(__AVR_ATmega168P__) \</span>
<a name="l00200"></a>00200 <span class="preprocessor">|| defined(__AVR_ATmega169__) \</span>
<a name="l00201"></a>00201 <span class="preprocessor">|| defined(__AVR_ATmega169A__) \</span>
<a name="l00202"></a>00202 <span class="preprocessor">|| defined(__AVR_ATmega169P__) \</span>
<a name="l00203"></a>00203 <span class="preprocessor">|| defined(__AVR_ATmega169PA__) \</span>
<a name="l00204"></a>00204 <span class="preprocessor">|| defined(__AVR_ATmega16HVA__) \</span>
<a name="l00205"></a>00205 <span class="preprocessor">|| defined(__AVR_ATmega16HVA2__) \</span>
<a name="l00206"></a>00206 <span class="preprocessor">|| defined(__AVR_ATmega16HVB__) \</span>
<a name="l00207"></a>00207 <span class="preprocessor">|| defined(__AVR_ATmega16HVBREVB__) \</span>
<a name="l00208"></a>00208 <span class="preprocessor">|| defined(__AVR_ATmega16M1__) \</span>
<a name="l00209"></a>00209 <span class="preprocessor">|| defined(__AVR_ATmega16U2__) \</span>
<a name="l00210"></a>00210 <span class="preprocessor">|| defined(__AVR_ATmega16U4__) \</span>
<a name="l00211"></a>00211 <span class="preprocessor">|| defined(__AVR_ATmega2560__) \</span>
<a name="l00212"></a>00212 <span class="preprocessor">|| defined(__AVR_ATmega2561__) \</span>
<a name="l00213"></a>00213 <span class="preprocessor">|| defined(__AVR_ATmega324__) \</span>
<a name="l00214"></a>00214 <span class="preprocessor">|| defined(__AVR_ATmega324A__) \</span>
<a name="l00215"></a>00215 <span class="preprocessor">|| defined(__AVR_ATmega324P__) \</span>
<a name="l00216"></a>00216 <span class="preprocessor">|| defined(__AVR_ATmega324PA__) \</span>
<a name="l00217"></a>00217 <span class="preprocessor">|| defined(__AVR_ATmega325__) \</span>
<a name="l00218"></a>00218 <span class="preprocessor">|| defined(__AVR_ATmega325A__) \</span>
<a name="l00219"></a>00219 <span class="preprocessor">|| defined(__AVR_ATmega325P__) \</span>
<a name="l00220"></a>00220 <span class="preprocessor">|| defined(__AVR_ATmega3250__) \</span>
<a name="l00221"></a>00221 <span class="preprocessor">|| defined(__AVR_ATmega3250A__) \</span>
<a name="l00222"></a>00222 <span class="preprocessor">|| defined(__AVR_ATmega3250P__) \</span>
<a name="l00223"></a>00223 <span class="preprocessor">|| defined(__AVR_ATmega328__) \</span>
<a name="l00224"></a>00224 <span class="preprocessor">|| defined(__AVR_ATmega328P__) \</span>
<a name="l00225"></a>00225 <span class="preprocessor">|| defined(__AVR_ATmega329__) \</span>
<a name="l00226"></a>00226 <span class="preprocessor">|| defined(__AVR_ATmega329A__) \</span>
<a name="l00227"></a>00227 <span class="preprocessor">|| defined(__AVR_ATmega329P__) \</span>
<a name="l00228"></a>00228 <span class="preprocessor">|| defined(__AVR_ATmega329PA__) \</span>
<a name="l00229"></a>00229 <span class="preprocessor">|| defined(__AVR_ATmega3290__) \</span>
<a name="l00230"></a>00230 <span class="preprocessor">|| defined(__AVR_ATmega3290A__) \</span>
<a name="l00231"></a>00231 <span class="preprocessor">|| defined(__AVR_ATmega3290P__) \</span>
<a name="l00232"></a>00232 <span class="preprocessor">|| defined(__AVR_ATmega32C1__) \</span>
<a name="l00233"></a>00233 <span class="preprocessor">|| defined(__AVR_ATmega32HVB__) \</span>
<a name="l00234"></a>00234 <span class="preprocessor">|| defined(__AVR_ATmega32HVBREVB__) \</span>
<a name="l00235"></a>00235 <span class="preprocessor">|| defined(__AVR_ATmega32M1__) \</span>
<a name="l00236"></a>00236 <span class="preprocessor">|| defined(__AVR_ATmega32U2__) \</span>
<a name="l00237"></a>00237 <span class="preprocessor">|| defined(__AVR_ATmega32U4__) \</span>
<a name="l00238"></a>00238 <span class="preprocessor">|| defined(__AVR_ATmega32U6__) \</span>
<a name="l00239"></a>00239 <span class="preprocessor">|| defined(__AVR_ATmega406__) \</span>
<a name="l00240"></a>00240 <span class="preprocessor">|| defined(__AVR_ATmega48__) \</span>
<a name="l00241"></a>00241 <span class="preprocessor">|| defined(__AVR_ATmega48A__) \</span>
<a name="l00242"></a>00242 <span class="preprocessor">|| defined(__AVR_ATmega48P__) \</span>
<a name="l00243"></a>00243 <span class="preprocessor">|| defined(__AVR_ATmega640__) \</span>
<a name="l00244"></a>00244 <span class="preprocessor">|| defined(__AVR_ATmega644__) \</span>
<a name="l00245"></a>00245 <span class="preprocessor">|| defined(__AVR_ATmega644A__) \</span>
<a name="l00246"></a>00246 <span class="preprocessor">|| defined(__AVR_ATmega644P__) \</span>
<a name="l00247"></a>00247 <span class="preprocessor">|| defined(__AVR_ATmega644PA__) \</span>
<a name="l00248"></a>00248 <span class="preprocessor">|| defined(__AVR_ATmega645__) \</span>
<a name="l00249"></a>00249 <span class="preprocessor">|| defined(__AVR_ATmega645A__) \</span>
<a name="l00250"></a>00250 <span class="preprocessor">|| defined(__AVR_ATmega645P__) \</span>
<a name="l00251"></a>00251 <span class="preprocessor">|| defined(__AVR_ATmega6450__) \</span>
<a name="l00252"></a>00252 <span class="preprocessor">|| defined(__AVR_ATmega6450A__) \</span>
<a name="l00253"></a>00253 <span class="preprocessor">|| defined(__AVR_ATmega6450P__) \</span>
<a name="l00254"></a>00254 <span class="preprocessor">|| defined(__AVR_ATmega649__) \</span>
<a name="l00255"></a>00255 <span class="preprocessor">|| defined(__AVR_ATmega649A__) \</span>
<a name="l00256"></a>00256 <span class="preprocessor">|| defined(__AVR_ATmega6490__) \</span>
<a name="l00257"></a>00257 <span class="preprocessor">|| defined(__AVR_ATmega6490A__) \</span>
<a name="l00258"></a>00258 <span class="preprocessor">|| defined(__AVR_ATmega6490P__) \</span>
<a name="l00259"></a>00259 <span class="preprocessor">|| defined(__AVR_ATmega649P__) \</span>
<a name="l00260"></a>00260 <span class="preprocessor">|| defined(__AVR_ATmega64C1__) \</span>
<a name="l00261"></a>00261 <span class="preprocessor">|| defined(__AVR_ATmega64HVE__) \</span>
<a name="l00262"></a>00262 <span class="preprocessor">|| defined(__AVR_ATmega64M1__) \</span>
<a name="l00263"></a>00263 <span class="preprocessor">|| defined(__AVR_ATmega88__) \</span>
<a name="l00264"></a>00264 <span class="preprocessor">|| defined(__AVR_ATmega88A__) \</span>
<a name="l00265"></a>00265 <span class="preprocessor">|| defined(__AVR_ATmega88P__) \</span>
<a name="l00266"></a>00266 <span class="preprocessor">|| defined(__AVR_ATmega88PA__) \</span>
<a name="l00267"></a>00267 <span class="preprocessor">|| defined(__AVR_ATmega8HVA__) \</span>
<a name="l00268"></a>00268 <span class="preprocessor">|| defined(__AVR_ATmega8U2__) \</span>
<a name="l00269"></a>00269 <span class="preprocessor">|| defined(__AVR_ATtiny48__) \</span>
<a name="l00270"></a>00270 <span class="preprocessor">|| defined(__AVR_ATtiny88__) \</span>
<a name="l00271"></a>00271 <span class="preprocessor">|| defined(__AVR_ATtiny87__) \</span>
<a name="l00272"></a>00272 <span class="preprocessor">|| defined(__AVR_ATtiny167__) \</span>
<a name="l00273"></a>00273 <span class="preprocessor">|| defined(__AVR_AT90SCR100__) \</span>
<a name="l00274"></a>00274 <span class="preprocessor">|| defined(__AVR_ATA6289__)</span>
<a name="l00275"></a>00275 <span class="preprocessor"></span>
<a name="l00276"></a>00276 <span class="comment">/* Use STS instruction. */</span>
<a name="l00277"></a>00277
<a name="l00278"></a>00278 <span class="preprocessor">#define wdt_enable(value) \</span>
<a name="l00279"></a>00279 <span class="preprocessor">__asm__ __volatile__ ( \</span>
<a name="l00280"></a>00280 <span class="preprocessor"> "in __tmp_reg__,__SREG__" "\n\t" \</span>
<a name="l00281"></a>00281 <span class="preprocessor"> "cli" "\n\t" \</span>
<a name="l00282"></a>00282 <span class="preprocessor"> "wdr" "\n\t" \</span>
<a name="l00283"></a>00283 <span class="preprocessor"> "sts %0,%1" "\n\t" \</span>
<a name="l00284"></a>00284 <span class="preprocessor"> "out __SREG__,__tmp_reg__" "\n\t" \</span>
<a name="l00285"></a>00285 <span class="preprocessor"> "sts %0,%2" "\n\t" \</span>
<a name="l00286"></a>00286 <span class="preprocessor"> : </span><span class="comment">/* no outputs */</span> \
<a name="l00287"></a>00287 : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
<a name="l00288"></a>00288 "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
<a name="l00289"></a>00289 "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
<a name="l00290"></a>00290 _BV(WDE) | (value & 0x07)) ) \
<a name="l00291"></a>00291 : "r0" \
<a name="l00292"></a>00292 )
<a name="l00293"></a>00293
<a name="l00294"></a>00294 <span class="preprocessor">#define wdt_disable() \</span>
<a name="l00295"></a>00295 <span class="preprocessor">__asm__ __volatile__ ( \</span>
<a name="l00296"></a>00296 <span class="preprocessor"> "in __tmp_reg__, __SREG__" "\n\t" \</span>
<a name="l00297"></a>00297 <span class="preprocessor"> "cli" "\n\t" \</span>
<a name="l00298"></a>00298 <span class="preprocessor"> "sts %0, %1" "\n\t" \</span>
<a name="l00299"></a>00299 <span class="preprocessor"> "sts %0, __zero_reg__" "\n\t" \</span>
<a name="l00300"></a>00300 <span class="preprocessor"> "out __SREG__,__tmp_reg__" "\n\t" \</span>
<a name="l00301"></a>00301 <span class="preprocessor"> : </span><span class="comment">/* no outputs */</span> \
<a name="l00302"></a>00302 : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
<a name="l00303"></a>00303 "r" ((uint8_t)(_BV(_WD_CHANGE_BIT) | _BV(WDE))) \
<a name="l00304"></a>00304 : "r0" \
<a name="l00305"></a>00305 )
<a name="l00306"></a>00306
<a name="l00307"></a>00307
<a name="l00308"></a>00308
<a name="l00309"></a>00309 <span class="preprocessor">#else </span>
<a name="l00310"></a>00310 <span class="preprocessor"></span>
<a name="l00311"></a>00311 <span class="comment">/* Use OUT instruction. */</span>
<a name="l00312"></a>00312
<a name="l00313"></a><a class="code" href="group__avr__watchdog.html#gaf6cfea2a1b61e2530ea0c4ef8fc572b3">00313</a> <span class="preprocessor">#define wdt_enable(value) \</span>
<a name="l00314"></a>00314 <span class="preprocessor"> __asm__ __volatile__ ( \</span>
<a name="l00315"></a>00315 <span class="preprocessor"> "in __tmp_reg__,__SREG__" "\n\t" \</span>
<a name="l00316"></a>00316 <span class="preprocessor"> "cli" "\n\t" \</span>
<a name="l00317"></a>00317 <span class="preprocessor"> "wdr" "\n\t" \</span>
<a name="l00318"></a>00318 <span class="preprocessor"> "out %0,%1" "\n\t" \</span>
<a name="l00319"></a>00319 <span class="preprocessor"> "out __SREG__,__tmp_reg__" "\n\t" \</span>
<a name="l00320"></a>00320 <span class="preprocessor"> "out %0,%2" \</span>
<a name="l00321"></a>00321 <span class="preprocessor"> : </span><span class="comment">/* no outputs */</span> \
<a name="l00322"></a>00322 : "I" (_SFR_IO_ADDR(_WD_CONTROL_REG)), \
<a name="l00323"></a>00323 "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
<a name="l00324"></a>00324 "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
<a name="l00325"></a>00325 _BV(WDE) | (value & 0x07)) ) \
<a name="l00326"></a>00326 : "r0" \
<a name="l00327"></a>00327 )
<a name="l00328"></a>00328 <span class="comment"></span>
<a name="l00329"></a>00329 <span class="comment">/**</span>
<a name="l00330"></a>00330 <span class="comment"> \ingroup avr_watchdog</span>
<a name="l00331"></a>00331 <span class="comment"> Disable the watchdog timer, if possible. This attempts to turn off the </span>
<a name="l00332"></a>00332 <span class="comment"> Enable bit in the watchdog control register. See the datasheet for </span>
<a name="l00333"></a>00333 <span class="comment"> details.</span>
<a name="l00334"></a>00334 <span class="comment">*/</span>
<a name="l00335"></a><a class="code" href="group__avr__watchdog.html#gab3784e1b871d61ed338da5658184b725">00335</a> <span class="preprocessor">#define wdt_disable() \</span>
<a name="l00336"></a>00336 <span class="preprocessor">__asm__ __volatile__ ( \</span>
<a name="l00337"></a>00337 <span class="preprocessor"> "in __tmp_reg__, __SREG__" "\n\t" \</span>
<a name="l00338"></a>00338 <span class="preprocessor"> "cli" "\n\t" \</span>
<a name="l00339"></a>00339 <span class="preprocessor"> "out %0, %1" "\n\t" \</span>
<a name="l00340"></a>00340 <span class="preprocessor"> "out %0, __zero_reg__" "\n\t" \</span>
<a name="l00341"></a>00341 <span class="preprocessor"> "out __SREG__,__tmp_reg__" "\n\t" \</span>
<a name="l00342"></a>00342 <span class="preprocessor"> : </span><span class="comment">/* no outputs */</span> \
<a name="l00343"></a>00343 : "I" (_SFR_IO_ADDR(_WD_CONTROL_REG)), \
<a name="l00344"></a>00344 "r" ((uint8_t)(_BV(_WD_CHANGE_BIT) | _BV(WDE))) \
<a name="l00345"></a>00345 : "r0" \
<a name="l00346"></a>00346 )
<a name="l00347"></a>00347
<a name="l00348"></a>00348 <span class="preprocessor">#endif</span>
<a name="l00349"></a>00349 <span class="preprocessor"></span>
<a name="l00350"></a>00350
<a name="l00351"></a>00351 <span class="comment"></span>
<a name="l00352"></a>00352 <span class="comment">/**</span>
<a name="l00353"></a>00353 <span class="comment"> \ingroup avr_watchdog</span>
<a name="l00354"></a>00354 <span class="comment"> Symbolic constants for the watchdog timeout. Since the watchdog</span>
<a name="l00355"></a>00355 <span class="comment"> timer is based on a free-running RC oscillator, the times are</span>
<a name="l00356"></a>00356 <span class="comment"> approximate only and apply to a supply voltage of 5 V. At lower</span>
<a name="l00357"></a>00357 <span class="comment"> supply voltages, the times will increase. For older devices, the</span>
<a name="l00358"></a>00358 <span class="comment"> times will be as large as three times when operating at Vcc = 3 V,</span>
<a name="l00359"></a>00359 <span class="comment"> while the newer devices (e. g. ATmega128, ATmega8) only experience</span>
<a name="l00360"></a>00360 <span class="comment"> a negligible change.</span>
<a name="l00361"></a>00361 <span class="comment"></span>
<a name="l00362"></a>00362 <span class="comment"> Possible timeout values are: 15 ms, 30 ms, 60 ms, 120 ms, 250 ms,</span>
<a name="l00363"></a>00363 <span class="comment"> 500 ms, 1 s, 2 s. (Some devices also allow for 4 s and 8 s.)</span>
<a name="l00364"></a>00364 <span class="comment"> Symbolic constants are formed by the prefix</span>
<a name="l00365"></a>00365 <span class="comment"> \c WDTO_, followed by the time.</span>
<a name="l00366"></a>00366 <span class="comment"></span>
<a name="l00367"></a>00367 <span class="comment"> Example that would select a watchdog timer expiry of approximately</span>
<a name="l00368"></a>00368 <span class="comment"> 500 ms:</span>
<a name="l00369"></a>00369 <span class="comment"> \code</span>
<a name="l00370"></a>00370 <span class="comment"> wdt_enable(WDTO_500MS);</span>
<a name="l00371"></a>00371 <span class="comment"> \endcode</span>
<a name="l00372"></a>00372 <span class="comment">*/</span>
<a name="l00373"></a><a class="code" href="group__avr__watchdog.html#gad45893280f49113ffc2e67e1d741f29d">00373</a> <span class="preprocessor">#define WDTO_15MS 0</span>
<a name="l00374"></a>00374 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00375"></a>00375 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00376"></a>00376 <span class="comment"> See \c WDT0_15MS */</span>
<a name="l00377"></a><a class="code" href="group__avr__watchdog.html#ga057dd21dc54e71de0e20d8bd5734915d">00377</a> <span class="preprocessor">#define WDTO_30MS 1</span>
<a name="l00378"></a>00378 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00379"></a>00379 <span class="comment">/** \ingroup avr_watchdog See</span>
<a name="l00380"></a>00380 <span class="comment"> \c WDT0_15MS */</span>
<a name="l00381"></a><a class="code" href="group__avr__watchdog.html#ga7a5b072c51c05a34cc38111f0e6724e5">00381</a> <span class="preprocessor">#define WDTO_60MS 2</span>
<a name="l00382"></a>00382 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00383"></a>00383 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00384"></a>00384 <span class="comment"> See \c WDT0_15MS */</span>
<a name="l00385"></a><a class="code" href="group__avr__watchdog.html#ga7d028bcdb4a4103549fc6fb4ec07fbcd">00385</a> <span class="preprocessor">#define WDTO_120MS 3</span>
<a name="l00386"></a>00386 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00387"></a>00387 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00388"></a>00388 <span class="comment"> See \c WDT0_15MS */</span>
<a name="l00389"></a><a class="code" href="group__avr__watchdog.html#ga66d5f50cc76b92c76900d77ef577d53e">00389</a> <span class="preprocessor">#define WDTO_250MS 4</span>
<a name="l00390"></a>00390 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00391"></a>00391 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00392"></a>00392 <span class="comment"> See \c WDT0_15MS */</span>
<a name="l00393"></a><a class="code" href="group__avr__watchdog.html#gacf89fc5fb6c8aa9efaadb86872cfbcdf">00393</a> <span class="preprocessor">#define WDTO_500MS 5</span>
<a name="l00394"></a>00394 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00395"></a>00395 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00396"></a>00396 <span class="comment"> See \c WDT0_15MS */</span>
<a name="l00397"></a><a class="code" href="group__avr__watchdog.html#ga36302e15f38a4eeb8a328724bb8165e9">00397</a> <span class="preprocessor">#define WDTO_1S 6</span>
<a name="l00398"></a>00398 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00399"></a>00399 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00400"></a>00400 <span class="comment"> See \c WDT0_15MS */</span>
<a name="l00401"></a><a class="code" href="group__avr__watchdog.html#ga05fc682d276a36d8cc4e9178340ff004">00401</a> <span class="preprocessor">#define WDTO_2S 7</span>
<a name="l00402"></a>00402 <span class="preprocessor"></span>
<a name="l00403"></a>00403 <span class="preprocessor">#if defined(__DOXYGEN__) || defined(WDP3)</span>
<a name="l00404"></a>00404 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00405"></a>00405 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00406"></a>00406 <span class="comment"> See \c WDT0_15MS</span>
<a name="l00407"></a>00407 <span class="comment"> Note: This is only available on the </span>
<a name="l00408"></a>00408 <span class="comment"> ATtiny2313, </span>
<a name="l00409"></a>00409 <span class="comment"> ATtiny24, ATtiny44, ATtiny84, ATtiny84A,</span>
<a name="l00410"></a>00410 <span class="comment"> ATtiny25, ATtiny45, ATtiny85, </span>
<a name="l00411"></a>00411 <span class="comment"> ATtiny261, ATtiny461, ATtiny861, </span>
<a name="l00412"></a>00412 <span class="comment"> ATmega48, ATmega88, ATmega168,</span>
<a name="l00413"></a>00413 <span class="comment"> ATmega48P, ATmega88P, ATmega168P, ATmega328P,</span>
<a name="l00414"></a>00414 <span class="comment"> ATmega164P, ATmega324P, ATmega644P, ATmega644,</span>
<a name="l00415"></a>00415 <span class="comment"> ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561,</span>
<a name="l00416"></a>00416 <span class="comment"> ATmega8HVA, ATmega16HVA, ATmega32HVB,</span>
<a name="l00417"></a>00417 <span class="comment"> ATmega406, ATmega1284P,</span>
<a name="l00418"></a>00418 <span class="comment"> AT90PWM1, AT90PWM2, AT90PWM2B, AT90PWM3, AT90PWM3B, AT90PWM216, AT90PWM316,</span>
<a name="l00419"></a>00419 <span class="comment"> AT90PWM81,</span>
<a name="l00420"></a>00420 <span class="comment"> AT90USB82, AT90USB162,</span>
<a name="l00421"></a>00421 <span class="comment"> AT90USB646, AT90USB647, AT90USB1286, AT90USB1287,</span>
<a name="l00422"></a>00422 <span class="comment"> ATtiny48, ATtiny88.</span>
<a name="l00423"></a>00423 <span class="comment"> */</span>
<a name="l00424"></a><a class="code" href="group__avr__watchdog.html#ga752b0b1b5ba9009bc09976494313e30d">00424</a> <span class="preprocessor">#define WDTO_4S 8</span>
<a name="l00425"></a>00425 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00426"></a>00426 <span class="comment">/** \ingroup avr_watchdog</span>
<a name="l00427"></a>00427 <span class="comment"> See \c WDT0_15MS</span>
<a name="l00428"></a>00428 <span class="comment"> Note: This is only available on the </span>
<a name="l00429"></a>00429 <span class="comment"> ATtiny2313, </span>
<a name="l00430"></a>00430 <span class="comment"> ATtiny24, ATtiny44, ATtiny84, ATtiny84A,</span>
<a name="l00431"></a>00431 <span class="comment"> ATtiny25, ATtiny45, ATtiny85, </span>
<a name="l00432"></a>00432 <span class="comment"> ATtiny261, ATtiny461, ATtiny861, </span>
<a name="l00433"></a>00433 <span class="comment"> ATmega48, ATmega88, ATmega168,</span>
<a name="l00434"></a>00434 <span class="comment"> ATmega48P, ATmega88P, ATmega168P, ATmega328P,</span>
<a name="l00435"></a>00435 <span class="comment"> ATmega164P, ATmega324P, ATmega644P, ATmega644,</span>
<a name="l00436"></a>00436 <span class="comment"> ATmega640, ATmega1280, ATmega1281, ATmega2560, ATmega2561,</span>
<a name="l00437"></a>00437 <span class="comment"> ATmega8HVA, ATmega16HVA, ATmega32HVB,</span>
<a name="l00438"></a>00438 <span class="comment"> ATmega406, ATmega1284P,</span>
<a name="l00439"></a>00439 <span class="comment"> AT90PWM1, AT90PWM2, AT90PWM2B, AT90PWM3, AT90PWM3B, AT90PWM216, AT90PWM316,</span>
<a name="l00440"></a>00440 <span class="comment"> AT90PWM81,</span>
<a name="l00441"></a>00441 <span class="comment"> AT90USB82, AT90USB162,</span>
<a name="l00442"></a>00442 <span class="comment"> AT90USB646, AT90USB647, AT90USB1286, AT90USB1287,</span>
<a name="l00443"></a>00443 <span class="comment"> ATtiny48, ATtiny88.</span>
<a name="l00444"></a>00444 <span class="comment"> */</span>
<a name="l00445"></a><a class="code" href="group__avr__watchdog.html#gaf074e538b2a1d5031931530f29a09fce">00445</a> <span class="preprocessor">#define WDTO_8S 9</span>
<a name="l00446"></a>00446 <span class="preprocessor"></span>
<a name="l00447"></a>00447 <span class="preprocessor">#endif </span><span class="comment">/* defined(__DOXYGEN__) || defined(WDP3) */</span>
<a name="l00448"></a>00448
<a name="l00449"></a>00449
<a name="l00450"></a>00450 <span class="preprocessor">#endif </span><span class="comment">/* _AVR_WDT_H_ */</span>
</pre></div></div>
</div>
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<p><center>Automatically generated by Doxygen 1.7.2 on Wed Feb 16 2011.</center></p>
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