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<td style="width: 80px;"><img alt="ChibiOS/RT Logo" src="logo_small.png"></td>
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<td><big><big>ChibiOS/RT</big></big><br><br>Architecture - Reference Manual - Guides</td>
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<h1>spi.c</h1> </div>
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<div class="contents">
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<a href="spi_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>
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<a name="l00002"></a>00002 <span class="comment"> ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.</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"> This file is part of ChibiOS/RT.</span>
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<a name="l00005"></a>00005 <span class="comment"></span>
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<a name="l00006"></a>00006 <span class="comment"> ChibiOS/RT is free software; you can redistribute it and/or modify</span>
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<a name="l00007"></a>00007 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
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<a name="l00008"></a>00008 <span class="comment"> the Free Software Foundation; either version 3 of the License, or</span>
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<a name="l00009"></a>00009 <span class="comment"> (at your option) any later version.</span>
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<a name="l00010"></a>00010 <span class="comment"></span>
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<a name="l00011"></a>00011 <span class="comment"> ChibiOS/RT is distributed in the hope that it will be useful,</span>
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<a name="l00012"></a>00012 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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<a name="l00013"></a>00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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<a name="l00014"></a>00014 <span class="comment"> GNU General Public License for more details.</span>
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<a name="l00015"></a>00015 <span class="comment"></span>
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<a name="l00016"></a>00016 <span class="comment"> You should have received a copy of the GNU General Public License</span>
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<a name="l00017"></a>00017 <span class="comment"> along with this program. If not, see <http://www.gnu.org/licenses/>.</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"> ---</span>
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<a name="l00020"></a>00020 <span class="comment"></span>
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<a name="l00021"></a>00021 <span class="comment"> A special exception to the GPL can be applied should you wish to distribute</span>
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<a name="l00022"></a>00022 <span class="comment"> a combined work that includes ChibiOS/RT, without being obliged to provide</span>
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<a name="l00023"></a>00023 <span class="comment"> the source code for any proprietary components. See the file exception.txt</span>
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<a name="l00024"></a>00024 <span class="comment"> for full details of how and when the exception can be applied.</span>
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<a name="l00025"></a>00025 <span class="comment">*/</span>
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<a name="l00026"></a>00026 <span class="comment"></span>
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<a name="l00027"></a>00027 <span class="comment">/**</span>
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<a name="l00028"></a>00028 <span class="comment"> * @file spi.c</span>
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<a name="l00029"></a>00029 <span class="comment"> * @brief SPI Driver code.</span>
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<a name="l00030"></a>00030 <span class="comment"> *</span>
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<a name="l00031"></a>00031 <span class="comment"> * @addtogroup SPI</span>
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<a name="l00032"></a>00032 <span class="comment"> * @{</span>
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<a name="l00033"></a>00033 <span class="comment"> */</span>
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<a name="l00034"></a>00034
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<a name="l00035"></a>00035 <span class="preprocessor">#include "<a class="code" href="ch_8h.html" title="ChibiOS/RT main include file.">ch.h</a>"</span>
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<a name="l00036"></a>00036 <span class="preprocessor">#include "<a class="code" href="hal_8h.html" title="HAL subsystem header.">hal.h</a>"</span>
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<a name="l00037"></a>00037
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<a name="l00038"></a>00038 <span class="preprocessor">#if CH_HAL_USE_SPI || defined(__DOXYGEN__)</span>
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<a name="l00039"></a>00039 <span class="preprocessor"></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">/* Driver exported variables. */</span>
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<a name="l00042"></a>00042 <span class="comment">/*===========================================================================*/</span>
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<a name="l00043"></a>00043
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<a name="l00044"></a>00044 <span class="comment">/*===========================================================================*/</span>
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<a name="l00045"></a>00045 <span class="comment">/* Driver local variables. */</span>
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<a name="l00046"></a>00046 <span class="comment">/*===========================================================================*/</span>
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<a name="l00047"></a>00047
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<a name="l00048"></a>00048 <span class="comment">/*===========================================================================*/</span>
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<a name="l00049"></a>00049 <span class="comment">/* Driver local functions. */</span>
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<a name="l00050"></a>00050 <span class="comment">/*===========================================================================*/</span>
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<a name="l00051"></a>00051
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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">/* Driver exported functions. */</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"></span>
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<a name="l00056"></a>00056 <span class="comment">/**</span>
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<a name="l00057"></a>00057 <span class="comment"> * @brief SPI Driver initialization.</span>
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<a name="l00058"></a>00058 <span class="comment"> */</span>
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<a name="l00059"></a><a class="code" href="group___s_p_i.html#ga3c484a97cdec02c5dbf46a11245e3395">00059</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga3c484a97cdec02c5dbf46a11245e3395" title="SPI Driver initialization.">spiInit</a>(<span class="keywordtype">void</span>) {
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<a name="l00060"></a>00060
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<a name="l00061"></a>00061 <a class="code" href="group___s_p_i___l_l_d.html#ga5bdaf423b4fa6a78a1689b5a7721ea7e" title="Low level SPI driver initialization.">spi_lld_init</a>();
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<a name="l00062"></a>00062 }
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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">/**</span>
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<a name="l00065"></a>00065 <span class="comment"> * @brief Initializes the standard part of a @p SPIDriver structure.</span>
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<a name="l00066"></a>00066 <span class="comment"> *</span>
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<a name="l00067"></a>00067 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
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<a name="l00068"></a>00068 <span class="comment"> */</span>
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<a name="l00069"></a><a class="code" href="group___s_p_i.html#ga87a7bdc554b8e8fdfc77064e67689fcf">00069</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga87a7bdc554b8e8fdfc77064e67689fcf" title="Initializes the standard part of a SPIDriver structure.">spiObjectInit</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip) {
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<a name="l00070"></a>00070
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<a name="l00071"></a>00071 spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> = SPI_STOP;
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<a name="l00072"></a>00072 <span class="preprocessor">#if SPI_USE_MUTUAL_EXCLUSION</span>
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<a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor">#if CH_USE_MUTEXES</span>
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<a name="l00074"></a>00074 <span class="preprocessor"></span> <a class="code" href="group__mutexes.html#gac55fe4d05aa6bbeb31594193d2e4d2b6" title="Initializes s Mutex structure.">chMtxInit</a>(&spip-><a class="code" href="struct_s_p_i_driver.html#aad4a0dbb074013406c4bce20d1cb9326" title="Mutex protecting the bus.">spd_mutex</a>);
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<a name="l00075"></a>00075 <span class="preprocessor">#else</span>
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<a name="l00076"></a>00076 <span class="preprocessor"></span> <a class="code" href="group__semaphores.html#gafe8fc6155a871074e8017efd908b2c58" title="Initializes a semaphore with the specified counter value.">chSemInit</a>(&spip->spd_semaphore, 1);
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<a name="l00077"></a>00077 <span class="preprocessor">#endif</span>
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<a name="l00078"></a>00078 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* SPI_USE_MUTUAL_EXCLUSION */</span>
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<a name="l00079"></a>00079 spip-><a class="code" href="struct_s_p_i_driver.html#a5dd4d2ee17acb22bf3e14dc8fa392195" title="Current configuration data.">spd_config</a> = NULL;
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<a name="l00080"></a>00080 }
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<a name="l00081"></a>00081 <span class="comment"></span>
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<a name="l00082"></a>00082 <span class="comment">/**</span>
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<a name="l00083"></a>00083 <span class="comment"> * @brief Configures and activates the SPI peripheral.</span>
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<a name="l00084"></a>00084 <span class="comment"> *</span>
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<a name="l00085"></a>00085 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
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<a name="l00086"></a>00086 <span class="comment"> * @param[in] config pointer to the @p SPIConfig object</span>
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<a name="l00087"></a>00087 <span class="comment"> */</span>
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<a name="l00088"></a><a class="code" href="group___s_p_i.html#ga6752c9f736f8de774a5bef6dfe2aae2e">00088</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga6752c9f736f8de774a5bef6dfe2aae2e" title="Configures and activates the SPI peripheral.">spiStart</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip, <span class="keyword">const</span> <a class="code" href="struct_s_p_i_config.html" title="Driver configuration structure.">SPIConfig</a> *config) {
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<a name="l00089"></a>00089
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<a name="l00090"></a>00090 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>((spip != NULL) && (config != NULL), <span class="stringliteral">"spiStart"</span>);
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<a name="l00091"></a>00091
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<a name="l00092"></a>00092 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
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<a name="l00093"></a>00093 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>((spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a22a603b07f381cba1ced3de36a0c3ce7" title="Stopped.">SPI_STOP</a>) || (spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a2894d6080831bc10e8c6f7c33c60c4ba" title="Ready.">SPI_READY</a>),
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<a name="l00094"></a>00094 <span class="stringliteral">"spiStart(), #1"</span>,
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<a name="l00095"></a>00095 <span class="stringliteral">"invalid state"</span>);
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<a name="l00096"></a>00096 spip-><a class="code" href="struct_s_p_i_driver.html#a5dd4d2ee17acb22bf3e14dc8fa392195" title="Current configuration data.">spd_config</a> = config;
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<a name="l00097"></a>00097 <a class="code" href="group___s_p_i___l_l_d.html#gaf35495bd4459608ae22a3f728fd4697b" title="Configures and activates the SPI peripheral.">spi_lld_start</a>(spip);
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<a name="l00098"></a>00098 spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> = SPI_READY;
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<a name="l00099"></a>00099 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
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<a name="l00100"></a>00100 }
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<a name="l00101"></a>00101 <span class="comment"></span>
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<a name="l00102"></a>00102 <span class="comment">/**</span>
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<a name="l00103"></a>00103 <span class="comment"> * @brief Deactivates the SPI peripheral.</span>
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<a name="l00104"></a>00104 <span class="comment"> *</span>
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<a name="l00105"></a>00105 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
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<a name="l00106"></a>00106 <span class="comment"> */</span>
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<a name="l00107"></a><a class="code" href="group___s_p_i.html#gad3a359eea03e68e95899886ae93a06e4">00107</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#gad3a359eea03e68e95899886ae93a06e4" title="Deactivates the SPI peripheral.">spiStop</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip) {
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<a name="l00108"></a>00108
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<a name="l00109"></a>00109 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(spip != NULL, <span class="stringliteral">"spiStop"</span>);
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<a name="l00110"></a>00110
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<a name="l00111"></a>00111 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
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<a name="l00112"></a>00112 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>((spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a22a603b07f381cba1ced3de36a0c3ce7" title="Stopped.">SPI_STOP</a>) || (spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a2894d6080831bc10e8c6f7c33c60c4ba" title="Ready.">SPI_READY</a>),
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<a name="l00113"></a>00113 <span class="stringliteral">"spiStop(), #1"</span>,
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<a name="l00114"></a>00114 <span class="stringliteral">"invalid state"</span>);
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<a name="l00115"></a>00115 <a class="code" href="group___s_p_i___l_l_d.html#ga8d6b2e0764d39b892b51e6abe4923f80" title="Deactivates the SPI peripheral.">spi_lld_stop</a>(spip);
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<a name="l00116"></a>00116 spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> = SPI_STOP;
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<a name="l00117"></a>00117 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
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<a name="l00118"></a>00118 }
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<a name="l00119"></a>00119 <span class="comment"></span>
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<a name="l00120"></a>00120 <span class="comment">/**</span>
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<a name="l00121"></a>00121 <span class="comment"> * @brief Asserts the slave select signal and prepares for transfers.</span>
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<a name="l00122"></a>00122 <span class="comment"> *</span>
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<a name="l00123"></a>00123 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
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<a name="l00124"></a>00124 <span class="comment"> */</span>
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<a name="l00125"></a><a class="code" href="group___s_p_i.html#ga00809152c869db80192aa3e04266a99a">00125</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga00809152c869db80192aa3e04266a99a" title="Asserts the slave select signal and prepares for transfers.">spiSelect</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip) {
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<a name="l00126"></a>00126
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<a name="l00127"></a>00127 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(spip != NULL, <span class="stringliteral">"spiSelect"</span>);
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<a name="l00128"></a>00128
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<a name="l00129"></a>00129 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
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<a name="l00130"></a>00130 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>((spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a2894d6080831bc10e8c6f7c33c60c4ba" title="Ready.">SPI_READY</a>) ||
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<a name="l00131"></a>00131 (spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a11bc2d5065a95dc8d721e2070708ba5f" title="Slave selected.">SPI_ACTIVE</a>),
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<a name="l00132"></a>00132 <span class="stringliteral">"spiSelect(), #1"</span>,
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<a name="l00133"></a>00133 <span class="stringliteral">"not idle"</span>);
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<a name="l00134"></a>00134 <a class="code" href="group___s_p_i___l_l_d.html#ga5a671d4e8d120120a26d9bfb0c016507" title="Asserts the slave select signal and prepares for transfers.">spi_lld_select</a>(spip);
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<a name="l00135"></a>00135 spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> = SPI_ACTIVE;
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<a name="l00136"></a>00136 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
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<a name="l00137"></a>00137 }
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<a name="l00138"></a>00138 <span class="comment"></span>
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<a name="l00139"></a>00139 <span class="comment">/**</span>
|
|
<a name="l00140"></a>00140 <span class="comment"> * @brief Deasserts the slave select signal.</span>
|
|
<a name="l00141"></a>00141 <span class="comment"> * @details The previously selected peripheral is unselected.</span>
|
|
<a name="l00142"></a>00142 <span class="comment"> *</span>
|
|
<a name="l00143"></a>00143 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00144"></a>00144 <span class="comment"> */</span>
|
|
<a name="l00145"></a><a class="code" href="group___s_p_i.html#gae291c012872da9c89dec23581f701b5f">00145</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#gae291c012872da9c89dec23581f701b5f" title="Deasserts the slave select signal.">spiUnselect</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip) {
|
|
<a name="l00146"></a>00146
|
|
<a name="l00147"></a>00147 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(spip != NULL, <span class="stringliteral">"spiUnselect"</span>);
|
|
<a name="l00148"></a>00148
|
|
<a name="l00149"></a>00149 <a class="code" href="group__system.html#ga9f6573c0763d1e4e97c63c62edad6e42" title="Enters the kernel lock mode.">chSysLock</a>();
|
|
<a name="l00150"></a>00150 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>((spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a2894d6080831bc10e8c6f7c33c60c4ba" title="Ready.">SPI_READY</a>) ||
|
|
<a name="l00151"></a>00151 (spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a11bc2d5065a95dc8d721e2070708ba5f" title="Slave selected.">SPI_ACTIVE</a>),
|
|
<a name="l00152"></a>00152 <span class="stringliteral">"spiUnselect(), #1"</span>,
|
|
<a name="l00153"></a>00153 <span class="stringliteral">"not locked"</span>);
|
|
<a name="l00154"></a>00154 <a class="code" href="group___s_p_i___l_l_d.html#gafa343fd905298991aa4005015263bcd2" title="Deasserts the slave select signal.">spi_lld_unselect</a>(spip);
|
|
<a name="l00155"></a>00155 spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> = SPI_READY;
|
|
<a name="l00156"></a>00156 <a class="code" href="group__system.html#ga5a257fa58a09815eb64a45e2dfbdc22e" title="Leaves the kernel lock mode.">chSysUnlock</a>();
|
|
<a name="l00157"></a>00157 }
|
|
<a name="l00158"></a>00158 <span class="comment"></span>
|
|
<a name="l00159"></a>00159 <span class="comment">/**</span>
|
|
<a name="l00160"></a>00160 <span class="comment"> * @brief Ignores data on the SPI bus.</span>
|
|
<a name="l00161"></a>00161 <span class="comment"> * @details This function transmits a series of idle words on the SPI bus and</span>
|
|
<a name="l00162"></a>00162 <span class="comment"> * ignores the received data. This function can be invoked even</span>
|
|
<a name="l00163"></a>00163 <span class="comment"> * when a slave select signal has not been yet asserted.</span>
|
|
<a name="l00164"></a>00164 <span class="comment"> *</span>
|
|
<a name="l00165"></a>00165 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00166"></a>00166 <span class="comment"> * @param[in] n number of words to be ignored</span>
|
|
<a name="l00167"></a>00167 <span class="comment"> */</span>
|
|
<a name="l00168"></a><a class="code" href="group___s_p_i.html#ga43889a7d4c473f653596f8c0acafce2a">00168</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga43889a7d4c473f653596f8c0acafce2a" title="Ignores data on the SPI bus.">spiIgnore</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip, <span class="keywordtype">size_t</span> n) {
|
|
<a name="l00169"></a>00169
|
|
<a name="l00170"></a>00170 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>((spip != NULL) && (n > 0), <span class="stringliteral">"spiIgnore"</span>);
|
|
<a name="l00171"></a>00171 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>((spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a2894d6080831bc10e8c6f7c33c60c4ba" title="Ready.">SPI_READY</a>) || (spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a11bc2d5065a95dc8d721e2070708ba5f" title="Slave selected.">SPI_ACTIVE</a>),
|
|
<a name="l00172"></a>00172 <span class="stringliteral">"spiIgnore(), #1"</span>,
|
|
<a name="l00173"></a>00173 <span class="stringliteral">"not active"</span>);
|
|
<a name="l00174"></a>00174
|
|
<a name="l00175"></a>00175 <a class="code" href="group___s_p_i___l_l_d.html#ga076fdc5d74009a7917723b663984d502" title="Ignores data on the SPI bus.">spi_lld_ignore</a>(spip, n);
|
|
<a name="l00176"></a>00176 }
|
|
<a name="l00177"></a>00177 <span class="comment"></span>
|
|
<a name="l00178"></a>00178 <span class="comment">/**</span>
|
|
<a name="l00179"></a>00179 <span class="comment"> * @brief Exchanges data on the SPI bus.</span>
|
|
<a name="l00180"></a>00180 <span class="comment"> * @details This function performs a simultaneous transmit/receive operation.</span>
|
|
<a name="l00181"></a>00181 <span class="comment"> * @note The buffers are organized as uint8_t arrays for data sizes below</span>
|
|
<a name="l00182"></a>00182 <span class="comment"> * or equal to 8 bits else it is organized as uint16_t arrays.</span>
|
|
<a name="l00183"></a>00183 <span class="comment"> *</span>
|
|
<a name="l00184"></a>00184 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00185"></a>00185 <span class="comment"> * @param[in] n number of words to be exchanged</span>
|
|
<a name="l00186"></a>00186 <span class="comment"> * @param[in] txbuf the pointer to the transmit buffer</span>
|
|
<a name="l00187"></a>00187 <span class="comment"> * @param[out] rxbuf the pointer to the receive buffer</span>
|
|
<a name="l00188"></a>00188 <span class="comment"> */</span>
|
|
<a name="l00189"></a><a class="code" href="group___s_p_i.html#gaf1c59f3fd2f85620a5253c23d9586095">00189</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#gaf1c59f3fd2f85620a5253c23d9586095" title="Exchanges data on the SPI bus.">spiExchange</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip, <span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">void</span> *txbuf, <span class="keywordtype">void</span> *rxbuf) {
|
|
<a name="l00190"></a>00190
|
|
<a name="l00191"></a>00191 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>((spip != NULL) && (n > 0) && (rxbuf != NULL) && (txbuf != NULL),
|
|
<a name="l00192"></a>00192 <span class="stringliteral">"spiExchange"</span>);
|
|
<a name="l00193"></a>00193 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a11bc2d5065a95dc8d721e2070708ba5f" title="Slave selected.">SPI_ACTIVE</a>,
|
|
<a name="l00194"></a>00194 <span class="stringliteral">"spiExchange(), #1"</span>,
|
|
<a name="l00195"></a>00195 <span class="stringliteral">"not active"</span>);
|
|
<a name="l00196"></a>00196
|
|
<a name="l00197"></a>00197 <a class="code" href="group___s_p_i___l_l_d.html#ga61b61b0999c813c1d8a3ddc415e8b0c7" title="Exchanges data on the SPI bus.">spi_lld_exchange</a>(spip, n, txbuf, rxbuf);
|
|
<a name="l00198"></a>00198 }
|
|
<a name="l00199"></a>00199 <span class="comment"></span>
|
|
<a name="l00200"></a>00200 <span class="comment">/**</span>
|
|
<a name="l00201"></a>00201 <span class="comment"> * @brief Sends data over the SPI bus.</span>
|
|
<a name="l00202"></a>00202 <span class="comment"> * @note The buffers are organized as uint8_t arrays for data sizes below</span>
|
|
<a name="l00203"></a>00203 <span class="comment"> * or equal to 8 bits else it is organized as uint16_t arrays.</span>
|
|
<a name="l00204"></a>00204 <span class="comment"> *</span>
|
|
<a name="l00205"></a>00205 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00206"></a>00206 <span class="comment"> * @param[in] n number of words to send</span>
|
|
<a name="l00207"></a>00207 <span class="comment"> * @param[in] txbuf the pointer to the transmit buffer</span>
|
|
<a name="l00208"></a>00208 <span class="comment"> */</span>
|
|
<a name="l00209"></a><a class="code" href="group___s_p_i.html#ga382cfbdffd2df57cf3843d45164e8bfc">00209</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga382cfbdffd2df57cf3843d45164e8bfc" title="Sends data over the SPI bus.">spiSend</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip, <span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">void</span> *txbuf) {
|
|
<a name="l00210"></a>00210
|
|
<a name="l00211"></a>00211 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>((spip != NULL) && (n > 0) && (txbuf != NULL),
|
|
<a name="l00212"></a>00212 <span class="stringliteral">"spiSend"</span>);
|
|
<a name="l00213"></a>00213 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a11bc2d5065a95dc8d721e2070708ba5f" title="Slave selected.">SPI_ACTIVE</a>,
|
|
<a name="l00214"></a>00214 <span class="stringliteral">"spiSend(), #1"</span>,
|
|
<a name="l00215"></a>00215 <span class="stringliteral">"not active"</span>);
|
|
<a name="l00216"></a>00216
|
|
<a name="l00217"></a>00217 <a class="code" href="group___s_p_i___l_l_d.html#gaa460d53de2de1c3bac67f95fe04da0fe" title="Sends data ever the SPI bus.">spi_lld_send</a>(spip, n, txbuf);
|
|
<a name="l00218"></a>00218 }
|
|
<a name="l00219"></a>00219 <span class="comment"></span>
|
|
<a name="l00220"></a>00220 <span class="comment">/**</span>
|
|
<a name="l00221"></a>00221 <span class="comment"> * @brief Receives data from the SPI bus.</span>
|
|
<a name="l00222"></a>00222 <span class="comment"> * @note The buffers are organized as uint8_t arrays for data sizes below</span>
|
|
<a name="l00223"></a>00223 <span class="comment"> * or equal to 8 bits else it is organized as uint16_t arrays.</span>
|
|
<a name="l00224"></a>00224 <span class="comment"> *</span>
|
|
<a name="l00225"></a>00225 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00226"></a>00226 <span class="comment"> * @param[in] n number of words to receive</span>
|
|
<a name="l00227"></a>00227 <span class="comment"> * @param[out] rxbuf the pointer to the receive buffer</span>
|
|
<a name="l00228"></a>00228 <span class="comment"> */</span>
|
|
<a name="l00229"></a><a class="code" href="group___s_p_i.html#gadd99ad823b391dde114f04dedafe5e80">00229</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#gadd99ad823b391dde114f04dedafe5e80" title="Receives data from the SPI bus.">spiReceive</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip, <span class="keywordtype">size_t</span> n, <span class="keywordtype">void</span> *rxbuf) {
|
|
<a name="l00230"></a>00230
|
|
<a name="l00231"></a>00231 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>((spip != NULL) && (n > 0) && (rxbuf != NULL),
|
|
<a name="l00232"></a>00232 <span class="stringliteral">"spiReceive"</span>);
|
|
<a name="l00233"></a>00233 <a class="code" href="group__debug.html#ga43d50c69eb730d0f024eb832d61f30c9" title="Condition assertion.">chDbgAssert</a>(spip-><a class="code" href="struct_s_p_i_driver.html#ae6b2b959753b948d1333885c745abc2a" title="Driver state.">spd_state</a> == <a class="code" href="group___s_p_i.html#gga2570f8c1ee9fc0dceaa8f77b999013c3a11bc2d5065a95dc8d721e2070708ba5f" title="Slave selected.">SPI_ACTIVE</a>,
|
|
<a name="l00234"></a>00234 <span class="stringliteral">"spiReceive(), #1"</span>,
|
|
<a name="l00235"></a>00235 <span class="stringliteral">"not active"</span>);
|
|
<a name="l00236"></a>00236
|
|
<a name="l00237"></a>00237 <a class="code" href="group___s_p_i___l_l_d.html#ga5b608b91dcec69818b2b3977a0d98bcb" title="Receives data from the SPI bus.">spi_lld_receive</a>(spip, n, rxbuf);
|
|
<a name="l00238"></a>00238 }
|
|
<a name="l00239"></a>00239
|
|
<a name="l00240"></a>00240 <span class="preprocessor">#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)</span>
|
|
<a name="l00241"></a>00241 <span class="preprocessor"></span><span class="comment">/**</span>
|
|
<a name="l00242"></a>00242 <span class="comment"> * @brief Gains exclusive access to the SPI bus.</span>
|
|
<a name="l00243"></a>00243 <span class="comment"> * @details This function tries to gain ownership to the SPI bus, if the bus</span>
|
|
<a name="l00244"></a>00244 <span class="comment"> * is already being used then the invoking thread is queued.</span>
|
|
<a name="l00245"></a>00245 <span class="comment"> * @note This function is only available when the @p SPI_USE_MUTUAL_EXCLUSION</span>
|
|
<a name="l00246"></a>00246 <span class="comment"> * option is set to @p TRUE.</span>
|
|
<a name="l00247"></a>00247 <span class="comment"> *</span>
|
|
<a name="l00248"></a>00248 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00249"></a>00249 <span class="comment"> *</span>
|
|
<a name="l00250"></a>00250 <span class="comment"> */</span>
|
|
<a name="l00251"></a><a class="code" href="group___s_p_i.html#ga803cec73f6dd8d3d1f18fb6a61b8255a">00251</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga803cec73f6dd8d3d1f18fb6a61b8255a" title="Gains exclusive access to the SPI bus.">spiAcquireBus</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip) {
|
|
<a name="l00252"></a>00252
|
|
<a name="l00253"></a>00253 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(spip != NULL, <span class="stringliteral">"spiAcquireBus"</span>);
|
|
<a name="l00254"></a>00254
|
|
<a name="l00255"></a>00255 <span class="preprocessor">#if CH_USE_MUTEXES</span>
|
|
<a name="l00256"></a>00256 <span class="preprocessor"></span> <a class="code" href="group__mutexes.html#gafa06b82e3496c44eb7bf31d9f1b655ba" title="Locks the specified mutex.">chMtxLock</a>(&spip-><a class="code" href="struct_s_p_i_driver.html#aad4a0dbb074013406c4bce20d1cb9326" title="Mutex protecting the bus.">spd_mutex</a>);
|
|
<a name="l00257"></a>00257 <span class="preprocessor">#elif CH_USE_SEMAPHORES</span>
|
|
<a name="l00258"></a>00258 <span class="preprocessor"></span> <a class="code" href="group__semaphores.html#gabc8f7e509870e9b0527a6a68fad71425" title="Performs a wait operation on a semaphore.">chSemWait</a>(&spip->spd_semaphore);
|
|
<a name="l00259"></a>00259 <span class="preprocessor">#endif</span>
|
|
<a name="l00260"></a>00260 <span class="preprocessor"></span>}
|
|
<a name="l00261"></a>00261 <span class="comment"></span>
|
|
<a name="l00262"></a>00262 <span class="comment">/**</span>
|
|
<a name="l00263"></a>00263 <span class="comment"> * @brief Releases exclusive access to the SPI bus.</span>
|
|
<a name="l00264"></a>00264 <span class="comment"> * @note This function is only available when the @p SPI_USE_MUTUAL_EXCLUSION</span>
|
|
<a name="l00265"></a>00265 <span class="comment"> * option is set to @p TRUE.</span>
|
|
<a name="l00266"></a>00266 <span class="comment"> *</span>
|
|
<a name="l00267"></a>00267 <span class="comment"> * @param[in] spip pointer to the @p SPIDriver object</span>
|
|
<a name="l00268"></a>00268 <span class="comment"> */</span>
|
|
<a name="l00269"></a><a class="code" href="group___s_p_i.html#ga1b04a2410ef4323ee4e37c63f320c18f">00269</a> <span class="keywordtype">void</span> <a class="code" href="group___s_p_i.html#ga1b04a2410ef4323ee4e37c63f320c18f" title="Releases exclusive access to the SPI bus.">spiReleaseBus</a>(<a class="code" href="struct_s_p_i_driver.html" title="Structure representing a SPI driver.">SPIDriver</a> *spip) {
|
|
<a name="l00270"></a>00270
|
|
<a name="l00271"></a>00271 <a class="code" href="group__debug.html#ga6bb6c0f97caab3a66332c8bfbf7a3844" title="Function parameter check.">chDbgCheck</a>(spip != NULL, <span class="stringliteral">"spiReleaseBus"</span>);
|
|
<a name="l00272"></a>00272
|
|
<a name="l00273"></a>00273 <span class="preprocessor">#if CH_USE_MUTEXES</span>
|
|
<a name="l00274"></a>00274 <span class="preprocessor"></span> (void)spip;
|
|
<a name="l00275"></a>00275 <a class="code" href="group__mutexes.html#gae9ae07165126c9f6c0ce0b17bdb53669" title="Unlocks the next owned mutex in reverse lock order.">chMtxUnlock</a>();
|
|
<a name="l00276"></a>00276 <span class="preprocessor">#elif CH_USE_SEMAPHORES</span>
|
|
<a name="l00277"></a>00277 <span class="preprocessor"></span> <a class="code" href="group__semaphores.html#ga7ec0cbda23e49e2370e0b91f20baf05e" title="Performs a signal operation on a semaphore.">chSemSignal</a>(&spip->spd_semaphore);
|
|
<a name="l00278"></a>00278 <span class="preprocessor">#endif</span>
|
|
<a name="l00279"></a>00279 <span class="preprocessor"></span>}
|
|
<a name="l00280"></a>00280 <span class="preprocessor">#endif </span><span class="comment">/* SPI_USE_MUTUAL_EXCLUSION */</span>
|
|
<a name="l00281"></a>00281
|
|
<a name="l00282"></a>00282 <span class="preprocessor">#endif </span><span class="comment">/* CH_HAL_USE_SPI */</span>
|
|
<a name="l00283"></a>00283 <span class="comment"></span>
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<a name="l00284"></a>00284 <span class="comment">/** @} */</span>
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Generated on Sun Oct 24 2010 09:40:37 for ChibiOS/RT by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.7.1</small></address>
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