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<td><big><big>ChibiOS/RT</big></big><br><br>Architecture - Reference Manual - Guides</td>
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<h1>mac.c</h1><a href="mac_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment"> This file is part of ChibiOS/RT.</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> ChibiOS/RT is free software; you can redistribute it and/or modify</span>
<a name="l00007"></a>00007 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
<a name="l00008"></a>00008 <span class="comment"> the Free Software Foundation; either version 3 of the License, or</span>
<a name="l00009"></a>00009 <span class="comment"> (at your option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment"> ChibiOS/RT is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00014"></a>00014 <span class="comment"> GNU General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> You should have received a copy of the GNU General Public License</span>
<a name="l00017"></a>00017 <span class="comment"> along with this program. If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment"> ---</span>
<a name="l00020"></a>00020 <span class="comment"></span>
<a name="l00021"></a>00021 <span class="comment"> A special exception to the GPL can be applied should you wish to distribute</span>
<a name="l00022"></a>00022 <span class="comment"> a combined work that includes ChibiOS/RT, without being obliged to provide</span>
<a name="l00023"></a>00023 <span class="comment"> the source code for any proprietary components. See the file exception.txt</span>
<a name="l00024"></a>00024 <span class="comment"> for full details of how and when the exception can be applied.</span>
<a name="l00025"></a>00025 <span class="comment">*/</span>
<a name="l00026"></a>00026 <span class="comment"></span>
<a name="l00027"></a>00027 <span class="comment">/**</span>
<a name="l00028"></a>00028 <span class="comment"> * @file mac.c</span>
<a name="l00029"></a>00029 <span class="comment"> * @brief MAC Driver code.</span>
<a name="l00030"></a>00030 <span class="comment"> *</span>
<a name="l00031"></a>00031 <span class="comment"> * @addtogroup MAC</span>
<a name="l00032"></a>00032 <span class="comment"> * @{</span>
<a name="l00033"></a>00033 <span class="comment"> */</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#include &quot;<a class="code" href="ch_8h.html" title="ChibiOS/RT main include file.">ch.h</a>&quot;</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include &quot;<a class="code" href="hal_8h.html" title="HAL subsystem header.">hal.h</a>&quot;</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="preprocessor">#if CH_HAL_USE_MAC || defined(__DOXYGEN__)</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span>
<a name="l00040"></a>00040 <span class="comment">/*===========================================================================*/</span>
<a name="l00041"></a>00041 <span class="comment">/* Driver exported variables. */</span>
<a name="l00042"></a>00042 <span class="comment">/*===========================================================================*/</span>
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="comment">/*===========================================================================*/</span>
<a name="l00045"></a>00045 <span class="comment">/* Driver local variables. */</span>
<a name="l00046"></a>00046 <span class="comment">/*===========================================================================*/</span>
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="comment">/*===========================================================================*/</span>
<a name="l00049"></a>00049 <span class="comment">/* Driver local functions. */</span>
<a name="l00050"></a>00050 <span class="comment">/*===========================================================================*/</span>
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="comment">/*===========================================================================*/</span>
<a name="l00053"></a>00053 <span class="comment">/* Driver interrupt handlers. */</span>
<a name="l00054"></a>00054 <span class="comment">/*===========================================================================*/</span>
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="comment">/*===========================================================================*/</span>
<a name="l00057"></a>00057 <span class="comment">/* Driver exported functions. */</span>
<a name="l00058"></a>00058 <span class="comment">/*===========================================================================*/</span>
<a name="l00059"></a>00059 <span class="comment"></span>
<a name="l00060"></a>00060 <span class="comment">/**</span>
<a name="l00061"></a>00061 <span class="comment"> * @brief MAC Driver initialization.</span>
<a name="l00062"></a>00062 <span class="comment"> */</span>
<a name="l00063"></a><a class="code" href="group___m_a_c.html#ga2f76703cfc76da57feedb57e9d37c8a4">00063</a> <span class="keywordtype">void</span> <a class="code" href="group___m_a_c.html#ga2f76703cfc76da57feedb57e9d37c8a4" title="MAC Driver initialization.">macInit</a>(<span class="keywordtype">void</span>) {
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <a class="code" href="group___m_a_c___l_l_d.html#ga37e276cbed823fb80fdce3df3f9f7ddf" title="Low level MAC initialization.">mac_lld_init</a>();
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067 <span class="comment"></span>
<a name="l00068"></a>00068 <span class="comment">/**</span>
<a name="l00069"></a>00069 <span class="comment"> * @brief Initialize the standard part of a @p MACDriver structure.</span>
<a name="l00070"></a>00070 <span class="comment"> *</span>
<a name="l00071"></a>00071 <span class="comment"> * @param[in] macp pointer to the @p MACDriver object</span>
<a name="l00072"></a>00072 <span class="comment"> */</span>
<a name="l00073"></a><a class="code" href="group___m_a_c.html#ga34d60b00ad9794d52da6833e18c9ec70">00073</a> <span class="keywordtype">void</span> <a class="code" href="group___m_a_c.html#ga34d60b00ad9794d52da6833e18c9ec70" title="Initialize the standard part of a MACDriver structure.">macObjectInit</a>(<a class="code" href="struct_m_a_c_driver.html" title="Structure representing a MAC driver.">MACDriver</a> *macp) {
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <a class="code" href="group__semaphores.html#gafe8fc6155a871074e8017efd908b2c58" title="Initializes a semaphore with the specified counter value.">chSemInit</a>(&amp;macp-&gt;<a class="code" href="struct_m_a_c_driver.html#a667cd08245f7f3cbd2c9fb7cf5abe2bd">md_tdsem</a>, 0);
<a name="l00076"></a>00076 <a class="code" href="group__semaphores.html#gafe8fc6155a871074e8017efd908b2c58" title="Initializes a semaphore with the specified counter value.">chSemInit</a>(&amp;macp-&gt;<a class="code" href="struct_m_a_c_driver.html#ade31ca2c5d242cd0418f3e44d92beaee">md_rdsem</a>, 0);
<a name="l00077"></a>00077 <span class="preprocessor">#if CH_USE_EVENTS</span>
<a name="l00078"></a>00078 <span class="preprocessor"></span> <a class="code" href="group__events.html#gab8d0fdc09be629dfb438c32a0523db42" title="Initializes an Event Source.">chEvtInit</a>(&amp;macp-&gt;<a class="code" href="struct_m_a_c_driver.html#a99d364bf90207cc47155765ae151bfc6">md_rdevent</a>);
<a name="l00079"></a>00079 <span class="preprocessor">#endif</span>
<a name="l00080"></a>00080 <span class="preprocessor"></span>}
<a name="l00081"></a>00081 <span class="comment"></span>
<a name="l00082"></a>00082 <span class="comment">/**</span>
<a name="l00083"></a>00083 <span class="comment"> * @brief MAC address setup.</span>
<a name="l00084"></a>00084 <span class="comment"> * @note This function must be invoked only with the driver in the stopped</span>
<a name="l00085"></a>00085 <span class="comment"> * state. If invoked on an active interface then it is ignored.</span>
<a name="l00086"></a>00086 <span class="comment"> *</span>
<a name="l00087"></a>00087 <span class="comment"> * @param[in] macp pointer to the @p MACDriver object</span>
<a name="l00088"></a>00088 <span class="comment"> * @param[in] p pointer to a six bytes buffer containing the MAC</span>
<a name="l00089"></a>00089 <span class="comment"> * address. If this parameter is set to @p NULL then MAC</span>
<a name="l00090"></a>00090 <span class="comment"> * a system default is used.</span>
<a name="l00091"></a>00091 <span class="comment"> *</span>
<a name="l00092"></a>00092 <span class="comment"> */</span>
<a name="l00093"></a><a class="code" href="group___m_a_c.html#ga2d3c3dcea43573cf2b5d674e98a37aa3">00093</a> <span class="keywordtype">void</span> <a class="code" href="group___m_a_c.html#ga2d3c3dcea43573cf2b5d674e98a37aa3" title="MAC address setup.">macSetAddress</a>(<a class="code" href="struct_m_a_c_driver.html" title="Structure representing a MAC driver.">MACDriver</a> *macp, <span class="keyword">const</span> <a class="code" href="group___s_t_m8___c_o_r_e.html#gaba7bc1797add20fe3efdf37ced1182c5">uint8_t</a> *p) {
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <a class="code" href="group___m_a_c___l_l_d.html#ga73678bb62809ae2a530ffe419c235afd" title="Low level MAC address setup.">mac_lld_set_address</a>(macp, p);
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 <span class="comment"></span>
<a name="l00098"></a>00098 <span class="comment">/**</span>
<a name="l00099"></a>00099 <span class="comment"> * @brief Allocates a transmission descriptor.</span>
<a name="l00100"></a>00100 <span class="comment"> * @details One of the available transmission descriptors is locked and</span>
<a name="l00101"></a>00101 <span class="comment"> * returned. If a descriptor is not currently available then the</span>
<a name="l00102"></a>00102 <span class="comment"> * invoking thread is queued until one is freed.</span>
<a name="l00103"></a>00103 <span class="comment"> *</span>
<a name="l00104"></a>00104 <span class="comment"> * @param[in] macp pointer to the @p MACDriver object</span>
<a name="l00105"></a>00105 <span class="comment"> * @param[out] tdp pointer to a @p MACTransmitDescriptor structure</span>
<a name="l00106"></a>00106 <span class="comment"> * @param[in] time the number of ticks before the operation timeouts,</span>
<a name="l00107"></a>00107 <span class="comment"> * the following special values are allowed:</span>
<a name="l00108"></a>00108 <span class="comment"> * - @a TIME_IMMEDIATE immediate timeout.</span>
<a name="l00109"></a>00109 <span class="comment"> * - @a TIME_INFINITE no timeout.</span>
<a name="l00110"></a>00110 <span class="comment"> * .</span>
<a name="l00111"></a>00111 <span class="comment"> * @return The operation status.</span>
<a name="l00112"></a>00112 <span class="comment"> * @retval RDY_OK the descriptor was obtained.</span>
<a name="l00113"></a>00113 <span class="comment"> * @retval RDY_TIMEOUT the operation timed out, descriptor not initialized.</span>
<a name="l00114"></a>00114 <span class="comment"> */</span>
<a name="l00115"></a><a class="code" href="group___m_a_c.html#ga7304721038db1d7c0cb616c9c4d3f0ce">00115</a> <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group___m_a_c.html#ga7304721038db1d7c0cb616c9c4d3f0ce" title="Allocates a transmission descriptor.">macWaitTransmitDescriptor</a>(<a class="code" href="struct_m_a_c_driver.html" title="Structure representing a MAC driver.">MACDriver</a> *macp,
<a name="l00116"></a>00116 <a class="code" href="struct_m_a_c_transmit_descriptor.html" title="Structure representing a transmit descriptor.">MACTransmitDescriptor</a> *tdp,
<a name="l00117"></a>00117 <a class="code" href="group__types.html#gae3e32a98d431a02106616da3071832dd" title="System Time, recommended fastest unsigned.">systime_t</a> time) {
<a name="l00118"></a>00118 <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> msg;
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="keywordflow">while</span> (((msg = <a class="code" href="group___m_a_c___l_l_d.html#ga021a3cb5a0217df7e1891e614c84e087" title="Returns a transmission descriptor.">max_lld_get_transmit_descriptor</a>(macp, tdp)) != <a class="code" href="group__scheduler.html#gae1c86078318e11c2fa57ee3c2ec69f61" title="Default thread wakeup low level message.">RDY_OK</a>) &amp;&amp;
<a name="l00121"></a>00121 (time &gt; 0)) {
<a name="l00122"></a>00122 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
<a name="l00123"></a>00123 <a class="code" href="group__types.html#gae3e32a98d431a02106616da3071832dd" title="System Time, recommended fastest unsigned.">systime_t</a> now = <a class="code" href="group__time.html#ga137c8f67c450f34416a786d169be90e2" title="Current system time.">chTimeNow</a>();
<a name="l00124"></a>00124 <span class="keywordflow">if</span> ((msg = <a class="code" href="group__semaphores.html#ga924ec5d191bb8debe8727ae4dd5d6d03" title="Performs a wait operation on a semaphore with timeout specification.">chSemWaitTimeoutS</a>(&amp;macp-&gt;<a class="code" href="struct_m_a_c_driver.html#a667cd08245f7f3cbd2c9fb7cf5abe2bd">md_tdsem</a>, time)) == <a class="code" href="group__scheduler.html#gaf28d5427eeeb8f737cc7db495157780c" title="Low level message sent to a thread awakened by a timeout.">RDY_TIMEOUT</a>)
<a name="l00125"></a>00125 <span class="keywordflow">break</span>;
<a name="l00126"></a>00126 <span class="keywordflow">if</span> (time != <a class="code" href="group__scheduler.html#gae1568cf3090c973c3bc47f86ae2f5afb" title="Infinite time specification for all the syscalls with a timeout specification.">TIME_INFINITE</a>)
<a name="l00127"></a>00127 time -= (<a class="code" href="group__time.html#ga137c8f67c450f34416a786d169be90e2" title="Current system time.">chTimeNow</a>() - now);
<a name="l00128"></a>00128 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130 <span class="keywordflow">return</span> msg;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 <span class="comment"></span>
<a name="l00133"></a>00133 <span class="comment">/**</span>
<a name="l00134"></a>00134 <span class="comment"> * @brief Releases a transmit descriptor and starts the transmission of the</span>
<a name="l00135"></a>00135 <span class="comment"> * enqueued data as a single frame.</span>
<a name="l00136"></a>00136 <span class="comment"> *</span>
<a name="l00137"></a>00137 <span class="comment"> * @param[in] tdp the pointer to the @p MACTransmitDescriptor structure</span>
<a name="l00138"></a>00138 <span class="comment"> */</span>
<a name="l00139"></a><a class="code" href="group___m_a_c.html#ga0f692163094614561eace2a8c30938f9">00139</a> <span class="keywordtype">void</span> <a class="code" href="group___m_a_c.html#ga0f692163094614561eace2a8c30938f9" title="Releases a transmit descriptor and starts the transmission of the enqueued data as...">macReleaseTransmitDescriptor</a>(<a class="code" href="struct_m_a_c_transmit_descriptor.html" title="Structure representing a transmit descriptor.">MACTransmitDescriptor</a> *tdp) {
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <a class="code" href="group___m_a_c___l_l_d.html#ga29cd5df4ce571b7088c7107cf7901330" title="Releases a transmit descriptor and starts the transmission of the enqueued data as...">mac_lld_release_transmit_descriptor</a>(tdp);
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 <span class="comment"></span>
<a name="l00144"></a>00144 <span class="comment">/**</span>
<a name="l00145"></a>00145 <span class="comment"> * @brief Waits for a received frame.</span>
<a name="l00146"></a>00146 <span class="comment"> * @details Stops until a frame is received and buffered. If a frame is</span>
<a name="l00147"></a>00147 <span class="comment"> * not immediately available then the invoking thread is queued</span>
<a name="l00148"></a>00148 <span class="comment"> * until one is received.</span>
<a name="l00149"></a>00149 <span class="comment"> *</span>
<a name="l00150"></a>00150 <span class="comment"> * @param[in] macp pointer to the @p MACDriver object</span>
<a name="l00151"></a>00151 <span class="comment"> * @param[out] rdp pointer to a @p MACReceiveDescriptor structure</span>
<a name="l00152"></a>00152 <span class="comment"> * @param[in] time the number of ticks before the operation timeouts,</span>
<a name="l00153"></a>00153 <span class="comment"> * the following special values are allowed:</span>
<a name="l00154"></a>00154 <span class="comment"> * - @a TIME_IMMEDIATE immediate timeout.</span>
<a name="l00155"></a>00155 <span class="comment"> * - @a TIME_INFINITE no timeout.</span>
<a name="l00156"></a>00156 <span class="comment"> * .</span>
<a name="l00157"></a>00157 <span class="comment"> * @return The operation status.</span>
<a name="l00158"></a>00158 <span class="comment"> * @retval RDY_OK the descriptor was obtained.</span>
<a name="l00159"></a>00159 <span class="comment"> * @retval RDY_TIMEOUT the operation timed out, descriptor not initialized.</span>
<a name="l00160"></a>00160 <span class="comment"> */</span>
<a name="l00161"></a><a class="code" href="group___m_a_c.html#ga151a33674ef86c2403ac7797fa87805c">00161</a> <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> <a class="code" href="group___m_a_c.html#ga151a33674ef86c2403ac7797fa87805c" title="Waits for a received frame.">macWaitReceiveDescriptor</a>(<a class="code" href="struct_m_a_c_driver.html" title="Structure representing a MAC driver.">MACDriver</a> *macp,
<a name="l00162"></a>00162 <a class="code" href="struct_m_a_c_receive_descriptor.html" title="Structure representing a receive descriptor.">MACReceiveDescriptor</a> *rdp,
<a name="l00163"></a>00163 <a class="code" href="group__types.html#gae3e32a98d431a02106616da3071832dd" title="System Time, recommended fastest unsigned.">systime_t</a> time) {
<a name="l00164"></a>00164 <a class="code" href="group__types.html#ga35bcb0c321cd7bc45bf1a11fa17ebdd3" title="Message, use signed pointer equivalent.">msg_t</a> msg;
<a name="l00165"></a>00165
<a name="l00166"></a>00166 <span class="keywordflow">while</span> (((msg = <a class="code" href="group___m_a_c___l_l_d.html#ga3420490c83eb7464185717f2044e1bc3" title="Returns a receive descriptor.">max_lld_get_receive_descriptor</a>(macp, rdp)) != <a class="code" href="group__scheduler.html#gae1c86078318e11c2fa57ee3c2ec69f61" title="Default thread wakeup low level message.">RDY_OK</a>) &amp;&amp;
<a name="l00167"></a>00167 (time &gt; 0)) {
<a name="l00168"></a>00168 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
<a name="l00169"></a>00169 <a class="code" href="group__types.html#gae3e32a98d431a02106616da3071832dd" title="System Time, recommended fastest unsigned.">systime_t</a> now = <a class="code" href="group__time.html#ga137c8f67c450f34416a786d169be90e2" title="Current system time.">chTimeNow</a>();
<a name="l00170"></a>00170 <span class="keywordflow">if</span> ((msg = <a class="code" href="group__semaphores.html#ga924ec5d191bb8debe8727ae4dd5d6d03" title="Performs a wait operation on a semaphore with timeout specification.">chSemWaitTimeoutS</a>(&amp;macp-&gt;<a class="code" href="struct_m_a_c_driver.html#ade31ca2c5d242cd0418f3e44d92beaee">md_rdsem</a>, time)) == <a class="code" href="group__scheduler.html#gaf28d5427eeeb8f737cc7db495157780c" title="Low level message sent to a thread awakened by a timeout.">RDY_TIMEOUT</a>)
<a name="l00171"></a>00171 <span class="keywordflow">break</span>;
<a name="l00172"></a>00172 <span class="keywordflow">if</span> (time != <a class="code" href="group__scheduler.html#gae1568cf3090c973c3bc47f86ae2f5afb" title="Infinite time specification for all the syscalls with a timeout specification.">TIME_INFINITE</a>)
<a name="l00173"></a>00173 time -= (<a class="code" href="group__time.html#ga137c8f67c450f34416a786d169be90e2" title="Current system time.">chTimeNow</a>() - now);
<a name="l00174"></a>00174 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 <span class="keywordflow">return</span> msg;
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 <span class="comment"></span>
<a name="l00179"></a>00179 <span class="comment">/**</span>
<a name="l00180"></a>00180 <span class="comment"> * @brief Releases a receive descriptor.</span>
<a name="l00181"></a>00181 <span class="comment"> * @details The descriptor and its buffer are made available for more incoming</span>
<a name="l00182"></a>00182 <span class="comment"> * frames.</span>
<a name="l00183"></a>00183 <span class="comment"> *</span>
<a name="l00184"></a>00184 <span class="comment"> * @param[in] rdp the pointer to the @p MACReceiveDescriptor structure</span>
<a name="l00185"></a>00185 <span class="comment"> */</span>
<a name="l00186"></a><a class="code" href="group___m_a_c.html#ga4c6470b965aef1ee65bc6dd24c71bc5c">00186</a> <span class="keywordtype">void</span> <a class="code" href="group___m_a_c.html#ga4c6470b965aef1ee65bc6dd24c71bc5c" title="Releases a receive descriptor.">macReleaseReceiveDescriptor</a>(<a class="code" href="struct_m_a_c_receive_descriptor.html" title="Structure representing a receive descriptor.">MACReceiveDescriptor</a> *rdp) {
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <a class="code" href="group___m_a_c___l_l_d.html#gaa04797c813452cbc715d4233e4c44f49" title="Releases a receive descriptor.">mac_lld_release_receive_descriptor</a>(rdp);
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 <span class="comment"></span>
<a name="l00191"></a>00191 <span class="comment">/**</span>
<a name="l00192"></a>00192 <span class="comment"> * @brief Updates and returns the link status.</span>
<a name="l00193"></a>00193 <span class="comment"> *</span>
<a name="l00194"></a>00194 <span class="comment"> * @param[in] macp pointer to the @p MACDriver object</span>
<a name="l00195"></a>00195 <span class="comment"> * @return The link status.</span>
<a name="l00196"></a>00196 <span class="comment"> * @retval TRUE if the link is active.</span>
<a name="l00197"></a>00197 <span class="comment"> * @retval FALSE if the link is down.</span>
<a name="l00198"></a>00198 <span class="comment"> */</span>
<a name="l00199"></a><a class="code" href="group___m_a_c.html#gab5bf748233450f371b5a88f2accf87e1">00199</a> <a class="code" href="group__types.html#ga7556af1cb61728b53228fa3af1c851de" title="Boolean, recommended the fastest signed.">bool_t</a> <a class="code" href="group___m_a_c.html#gab5bf748233450f371b5a88f2accf87e1" title="Updates and returns the link status.">macPollLinkStatus</a>(<a class="code" href="struct_m_a_c_driver.html" title="Structure representing a MAC driver.">MACDriver</a> *macp) {
<a name="l00200"></a>00200
<a name="l00201"></a>00201 <span class="keywordflow">return</span> <a class="code" href="group___m_a_c___l_l_d.html#ga5d9f510e66cbdd6f4968c5411c2de7a5" title="Updates and returns the link status.">mac_lld_poll_link_status</a>(macp);
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="preprocessor">#endif </span><span class="comment">/* CH_HAL_USE_MAC */</span>
<a name="l00205"></a>00205 <span class="comment"></span>
<a name="l00206"></a>00206 <span class="comment">/** @} */</span>
</pre></div></div>
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